PCM1771RGA_技术文档

ꢭ

ꢡ

ꢚ

ꢛ

ꢜ

ꢛ

ꢉ

ꢭ

ꢋꢢ

ꢛ

ꢚ

ꢩ

ꢪ

ꢘ

ꢀ

ꢛ

ꢚ

ꢦ

ꢡ

ꢜ

ꢠ

ꢢ

ꢞ

ꢟ

ꢘ

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢅ

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢃ

ꢙ

ꢛ

ꢝ

ꢟ

ꢔ

ꢘ

ꢟ

ꢞ

ꢛ

ꢞ

ꢟ

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

ꢆ

ꢇ

ꢈ

ꢉ

ꢊ

ꢇ

ꢆ

ꢋ

ꢌ

ꢍ

ꢎ

ꢁ

ꢌ

ꢏ

ꢐ

ꢆ

ꢇ

ꢈ

ꢉ

ꢀ

ꢇ

ꢈ

ꢎ

ꢑ

ꢒ

ꢋ

ꢎ

ꢑ

ꢎ

ꢇ

ꢌ

ꢓ

ꢎ

ꢐ

ꢔ

ꢇ

ꢐ

ꢔ

ꢍ

ꢔ

ꢋꢌ

ꢆ

ꢉ

ꢋ

ꢇ

ꢉ

ꢌ

ꢏ

ꢌ

ꢆ

ꢇ

ꢍ

ꢇ

ꢏ

ꢊ

ꢎ

ꢑ

ꢋ

ꢎ

ꢑ

ꢈ

ꢔ

ꢋ

ꢕ

ꢎ

ꢌ

ꢐ

ꢀ

ꢕ

ꢇ

ꢏ

ꢌ

ꢂ

ꢀ

ꢆ

ꢔ

ꢖ

ꢔ

ꢎ

ꢑ

D

Pop-Noise-Free Circuit

3.3-V Tolerant

FEATURES

D

Multilevel DAC Including Headphone

Amplifier

Packages: TSSOP-16 and VQFN-20, Lead Free

Analog Performance (V , V

= 2.4 V):

CC HP

APPLICATIONS

− Dynamic Range: 98 dB Typ

− THD+N at 0 dB: 0.1% Typ

− THD+N at −20 dB: 0.04% Typ

D

Portable Audio Player

Cellular Phone

PDA

− Output Power at R = 16 Ω: 13 mW

L

(Stereo), 26 mW (Monaural)

1.6-V to 3.6-V Single Power Supply

Low Power Dissipation: 6.5 mW at V

Other Applications Requiring Low-Voltage

Operation

D

,

CC

V

= 2.4 V

HP

DESCRIPTION

D

System Clock: 128 f , 192 f , 256 f , 384 f

S S S S

Sampling Frequency: 5 kHz to 50 kHz

The PCM1770 and PCM1771 devices are CMOS,

monolithic, integrated circuits which include stereo

digital-to-analog converters, headphone circuitry, and

support circuitry in small TSSOP-16 and VQFN-20

packages.

Software Control (PCM1770):

− 16-, 20-, 24-Bit Word Available

− Left-, Right-Justified, and I S

2

− Slave/Master Selectable

− Digital Attenuation: 0 dB to –62 dB,

1 dB/Step

− 44.1-kHz Digital De-Emphasis

− Zero Cross Attenuation

− Digital Soft Mute

The data converters use TI’s enhanced multilevel ∆-Σ

architecture, which employs noise shaping and

multilevel amplitude quantization to achieve excellent

dynamic performance and improved tolerance to clock

jitter. The PCM1770 and PCM1771 devices accept

several industry standard audio data formats with 16- to

− Monaural Analog-In With Mixing

− Monaural Speaker Mode

2

24-bit data, left-justified, I S, etc., providing easy

interfacing to audio DSP and decoder devices.

Sampling rates up to 50 kHz are supported. A full set of

user-programmable functions are accessible through a

3-wire serial control port, which supports register write

functions.

D

Hardware Control (PCM1771):

− Left-Justified and I S

− 44.1-kHz Digital De-Emphasis

− Monaural Analog-In With Mixing

2

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments

semiconductor products and disclaimers thereto appears at the end of this data sheet.

ꢀꢑ ꢇ ꢐꢓ ꢁ ꢋꢔ ꢇꢏ ꢐ ꢌꢋꢌ ꢗꢘ ꢙꢚ ꢛ ꢜꢝ ꢞꢗꢚꢘ ꢗꢟ ꢠꢡ ꢛ ꢛ ꢢꢘꢞ ꢝꢟ ꢚꢙ ꢣꢡꢤ ꢥꢗꢠ ꢝꢞꢗ ꢚꢘ ꢦꢝ ꢞꢢꢧ ꢀꢛ ꢚꢦꢡ ꢠꢞꢟ

ꢠ ꢚꢘ ꢙꢚꢛ ꢜ ꢞꢚ ꢟ ꢣꢢ ꢠ ꢗ ꢙꢗ ꢠ ꢝ ꢞꢗ ꢚꢘꢟ ꢣ ꢢꢛ ꢞꢨꢢ ꢞꢢ ꢛ ꢜꢟ ꢚꢙ ꢋꢢꢩ ꢝꢟ ꢔꢘꢟ ꢞꢛ ꢡꢜ ꢢꢘꢞ ꢟ ꢟꢞ ꢝꢘꢦ ꢝꢛ ꢦ ꢪ ꢝꢛ ꢛ ꢝ ꢘꢞꢫꢧ

ꢀꢛ ꢚ ꢦꢡꢠ ꢞ ꢗꢚ ꢘ ꢣꢛ ꢚ ꢠ ꢢ ꢟ ꢟ ꢗꢘ ꢬ ꢦꢚ ꢢ ꢟ ꢘꢚꢞ ꢘꢢ ꢠꢢ ꢟꢟ ꢝꢛ ꢗꢥ ꢫ ꢗꢘꢠ ꢥꢡꢦ ꢢ ꢞꢢ ꢟꢞꢗ ꢘꢬ ꢚꢙ ꢝꢥ ꢥ ꢣꢝ ꢛ ꢝꢜ ꢢꢞꢢ ꢛ ꢟꢧ

Copyright  2004, Texas Instruments Incorporated

ꢀ ꢁꢂ ꢃ ꢄ ꢄ ꢅ

ꢄ

ꢀ

ꢁ

ꢂ

ꢃ

ꢄ

ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during

storage or handling to prevent electrostatic damage to the MOS gates.

PACKAGE/ORDERING INFORMATION

OPERATION

TEMPERATURE

RANGE

PRODUCT

PACKGE

PACKAGE

CODE

PACKAGE

MARKING

ORDERING

NUMBER

TRANSPORT

MEDIA

PACKAGE

PCM1770PW

PCM1770PWR

PCM1770RGA

PCM1770RGAR

PCM1771PW

Tube

Tape and reel

Tray

PCM1770PW

PCM1770RGA

PCM1771PW

PCM1771RGA

16-lead TSSOP

20-lead VQFN

16-lead TSSOP

20-lead VQFN

16PW

20RGA

16PW

−25°C to 85°C

PCM1770

PCM1771

Tape and reel

Tube

PCM1771PWR

PCM1771RGA

PCM1771RGAR

Tape and reel

Tray

20RGA

Tape and reel

ABSOLUTE MAXIMUM RATINGS

over operating free-air temperature range unless otherwise noted

(1)

PCM1770

PCM1771

Supply voltage: V , V

CC HP

4 V

0.1 V

Supply voltage differences: V , V

CC HP

Ground voltage differences

Digital input voltage

0.1 V

–0.3 V to 4.0 V

10 mA

Input current (any terminals except supplies)

Operating temperature

–40°C to 125°C

–55°C to 150°C

150°C

Storage temperature

Junction temperature

Lead temperature (soldering)

Package temperature (IR reflow, peak)

260°C, 5 s

260°C

(1)

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

2

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢅ

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

ELECTRICAL CHARACTERISTICS

all specifications at T = 25°C, V

= V

HP

= 2.4 V, f = 44.1 kHz, system clock = 256 f and 24-bit data, R = 16 Ω, unless otherwise noted

A

CC

S

L

PCM1770PW, PCM1771PW,

PCM1770RGA, PCM1771RGA

PARAMETER

TEST CONDITIONS

UNIT

MIN

TYP

MAX

Resolution

24

Bits

OPERATING FREQUENCY

Sampling frequency (f )

S

5

50

kHz

System clock frequency

128f , 192 f , 256 f , 384 f

S

(1)(2)

DIGITAL INPUT/OUTPUT

V

0.7 V

Vdc

µA

IH

IL

CC

Input logic level

0.3 V

CC

10

I

V

IN

V

IN

= V

CC

= 0 V

IH

Input logic current

–10

µA

IL

V

I

= –2 mA

= 2 mA

0.7 V

Vdc

OH

CC

(3)

Output logic level

0.3 V

OL

CC

DYNAMIC PERFORMANCE (HEADPHONE OUTPUT)

Full scale output voltage

Dynamic range

0 dB

0.55 V

V

P-P

dB

HP

98

EIAJ, A-weighted

0 dB (13 mW)

−20 dB (0.1 mW)

Stereo

90

Signal-to-noise ratio

98

dB

0.1%

0.04%

13

THD+N

0.1%

10

20

64

14

mWrms

dB

Output power

Monaural

26

Channel separation

Load resistance

72

16

Ω

DC ACCURACY

Gain error

2

8

% of FSR

mV

Gain mismatch,

channel-to-channel

Bipolar zero error

V

OUT

= 0.5 V

CC

at BPZ

30

75

ANALOG LINE INPUT (MIXING CIRCUIT)

Analog input voltage range

0.584 V

HP

V

P-P

Gain (analog input to headphone

output)

0.67

Analog input impedance

THD+N

10

kΩ

AIN = 0.56 V

HP

(peak-to-peak)

0.1%

DIGITAL FILTER PERFORMANCE

Pass band

0.454 f

S

Stop band

0.546 f

S

Pass-band ripple

0.04

dB

Stop-band attenuation

Group delay

–50

20/f

S

44.1-kHz de-emphasis error

0.1

dB

(1)

(2)

(3)

Digital inputs and outputs are CMOS compatible.

All logic inputs are 3.3-V tolerant and not terminated internally.

LRCK and BCK terminals

3

ꢀ ꢁꢂ ꢃ ꢄ ꢄ ꢅ

ꢄ

ꢀ

ꢁ

ꢂ

ꢃ

ꢄ

ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

ELECTRICAL CHARACTERISTICS(continued)

all specifications at T = 25°C, V

= V

= 2.4 V, f = 44.1 kHz, system clock = 256 f and 24-bit data, R = 16 Ω, unless otherwise noted

A

CC

HP

S

L

PCM1770PW, PCM1771PW,

PCM1770RGA, PCM1771RGA

PARAMETER

TEST CONDITIONS

UNIT

MIN

TYP

MAX

ANALOG FILTER PERFORMANCE

Frequency response

at 20 kHz

0.2

dB

POWER SUPPLY REQUIREMENTS

Voltage range, V , V

CC HP

1.6

2.4

1.5

1.2

3.6

2.5

Vdc

mA

I

BPZ input

CC

HP

Supply current

I

+

CC

HP

(1)

Power down

5

15

µA

BPZ input

6.5

12

36

mW

Power dissipation

(1)

Power down

µW

TEMPERATURE RANGE

Operation temperature

–25

85

°C

PCM1770PW, −71PW: 16-terminal TSSOP

150

130

θ

Thermal resistance

All input signals are held static.

PCM1770RGA, −71RGA: 20-terminal

VQFN

°C/W

JA

(1)

PIN ASSIGNMENTS

PCM1770

PCM1771

PW PACKAGE

(TOP VIEW)

PW PACKAGE

(TOP VIEW)

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

LRCK

DATA

BCK

PD

AGND

HGND

SCKI

MS

MC

LRCK

DATA

BCK

PD

AGND

HGND

SCKI

FMT

AMIX

MD

DEMP

V

CC

HP

V

AIN

V

AIN

COM

H

R

H

L

H

R

H

L

OUT

PCM1770

RGA PACKAGE

(TOP VIEW)

PCM1771

RGA PACKAGE

(TOP VIEW)

20 19 18 17 16

15

20 19 18 17 16

1 15

1

FMT

DATA

BCK

MS

MC

MD

V

DATA

BCK

2

3

4

5

14

13

12

11

2

3

4

5

14

13

12

11

AMIX

DEMP

PD

V

CC

AGND

HGND

AGND

HGND

CC

V

HP

6

7

8

9

10

6

7

8

9 10

NC − No internal connection

4

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢅ

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

Terminal Functions

PCM1770PW

TERMINAL

I/O

DESCRIPTIONS

NAME

AGND

AIN

NO.

5

–

I

Analog ground. This is a return for V .

CC

10

3

Monaural analog signal mixer input. The signal can be mixed with the output of L- and R-channel DACs.

BCK

I/O

Serial bit clock. Clocks the individual bits of the audio data input, DATA. In the slave interface mode, this clock is input

from external device. In the master interface mode, the PCM1770 device generates the BCK output to external device.

DATA

2

6

9

8

1

I

–

Serial audio data input

HGND

Analog ground. This is a return for V .

HP

H

OUT

L

O

I/O

L-channel analog signal output of the headphone amplifiers

R-channel analog signal output of the headphone amplifiers

H

OUT

R

LRCK

Left and right clock. Determines which channel is being input on the audio data input, DATA. The frequency of LRCK

must be the same as the audio sampling rate. In the slave interface mode, this clock is input from an external device.

In the master interface mode, the PCM1770 device generates the LRCK output to an external device.

MC

MD

MS

PD

14

13

15

4

I

Mode control port serial bit clock input. Clocks the individual bits of the control data input, MD.

Mode control port serial data input. Controls the operation mode on the PCM1770 device.

Mode control port select. The control port is active when this terminal is low.

Reset input. When low, the PCM1770 device is powered down, and all mode control registers are reset to default

settings.

SCKI

16

12

7

I

System clock input

V

CC

–

Power supply for all analog circuits except the headphone amplifier.

V

COM

Decoupling capacitor connection. An external 10-µF capacitor connected from this terminal to analog ground is

required for noise filtering. Voltage level of this terminal is 0.5V

HP

nominal.

V

HP

11

–

Analog power supply for the headphone amplifier circuits. The voltage level must be the same as V

.

CC

PCM1770RGA

TERMINAL

I/O

DESCRIPTIONS

NAME

AGND

AIN

NO.

4

–

I

Analog ground. This is a return for V .

CC

10

2

Monaural analog signal mixer input. The signal can be mixed with output of L- and R-channel DACs.

BCK

I/O

Serial bit clock. Clocks the individual bits of the audio data input, DATA. In the slave interface mode, this clock is input

from external device. In the master interface mode, the PCM1770 device generates the BCK output to external

device.

DATA

1

5

I

–

Serial audio data input

HGND

Analog ground. This is a return for V .

HP

H

L

9

O

I/O

L-channel analog signal output of the headphone amplifiers

R-channel analog signal output of the headphone amplifiers

OUT

H

OUT

R

7

LRCK

20

Left and right clock. Determines which channel is being input on the audio data input, DATA. The frequency of LRCK

must be the same as the audio sampling rate. In the slave interface mode, this clock is input from an external device.

In the master interface mode, the PCM1770 device generates the LRCK output to an external device.

MC

MD

MS

NC

14

13

15

I

Mode control port serial bit clock input. Clocks the individual bits of the control data input, MD.

Mode control port serial data input. Controls the operation mode on the PCM1770 device.

Mode control port select. The control port is active when this terminal is low.

No connect

I

8, 17,

–

18, 19

PD

3

I

Reset input. When low, the PCM1770 device is powered down, and all mode control registers are reset to default

settings.

SCKI

16

12

6

I

System clock input

V

–

Power supply for all analog circuits except the headphone amplifier.

Decoupling capacitor connection. An external 10-µF capacitor connected from this terminal to analog ground is

CC

COM

required for noise filtering. Voltage level of this terminal is 0.5V

nominal.

HP

V

HP

11

–

Analog power supply for the headphone amplifier circuits. The voltage level must be the same as V .

CC

5

ꢀ ꢁꢂ ꢃ ꢄ ꢄ ꢅ

ꢄ

ꢀ

ꢁ

ꢂ

ꢃ

ꢄ

ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

Terminal Functions

PCM1771PW

TERMINAL

I/O

DESCRIPTIONS

NAME

AGND

AIN

NO.

5

–

I

Analog ground. This is a return for V .

CC

10

14

3

Monaural analog signal mixer input. The signal can be mixed with the output of L- and R-channel DACs.

AMIX

BCK

Analog mixing control

I

Serial bit clock. Clocks the individual bits of the audio data input, DATA.

DATA

DEMP

FMT

2

I

Serial audio data input

De-emphasis control

Data format select

13

15

6

I

HGND

–

O

I

Analog ground. This is a return for V .

HP

H

L

9

L-channel analog signal output of the headphone amplifiers

R-channel analog signal output of the headphone amplifiers

OUT

R

OUT

8

LRCK

1

Left and right clock. Determines which channel is being input on the audio data input, DATA. The frequency of LRCK

must be the same as the audio sampling rate.

PD

4

I

Reset input. When low, the PCM1771 device is powered down, and all mode control registers are reset to default

settings.

SCKI

16

12

7

I

System clock input

V

CC

–

Power supply for all analog circuits except the headphone amplifier.

V

COM

Decoupling capacitor connection. An external 10-µF capacitor connected from this terminal to analog ground is

required for noise filtering. Voltage level of this terminal is 0.5V

HP

nominal.

V

HP

11

–

Analog power supply for the headphone amplifier circuits. The voltage level must be the same as V

.

CC

PCM1771RGA

TERMINAL

I/O

DESCRIPTIONS

NAME

AGND

AIN

NO.

4

–

I

Analog ground. This is a return for V .

CC

10

14

2

Monaural analog signal mixer input. The signal can be mixed with the output of L- and R-channel DACs.

AMIX

BCK

Analog mixing control

I

Serial bit clock. Clocks the individual bits of the audio data input, DATA.

DATA

DEMP

FMT

1

I

Serial audio data input

De-emphasis control

Data format select

13

15

5

I

HGND

–

O

I

Analog ground. This is a return for V .

HP

H

OUT

L

9

L-channel analog signal output of the headphone amplifiers

R-channel analog signal output of the headphone amplifiers

H R

OUT

7

LRCK

NC

20

Left and right clock. Determines which channel is being input on the audio data input, DATA. The frequency of LRCK

must be the same as the audio sampling rate.

8, 17,

18, 19

–

I

No connect

PD

3

Reset input. When low, the PCM1771 device is powered down, and all mode control registers are reset to default

settings.

SCKI

16

12

6

I

System clock input

V

–

Power supply for all analog circuits except the headphone amplifier

Decoupling capacitor connection. An external 10-µF capacitor connected from this terminal to analog ground is

CC

COM

required for noise filtering. Voltage level of this terminal is 0.5V

nominal.

HP

V

HP

11

–

Analog power supply for the headphone amplifier circuits. The voltage level must be the same as V .

CC

6

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢅ

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

FUNCTIONAL BLOCK DIAGRAM

AIN

Digital

Attenuator

Headphone

Amplifier

LRCK

DATA

× 8

Digital

Filter

Audio

Interface

∆Σ

H

V

R

OUT

DAC

+

BCK

V

COM

(FMT) MS

(AMIX) MC

(DEMP) MD

× 8

Digital

Filter

SPI

Port

∆Σ

H

OUT

L

DAC

+

Clock Manager

Power Supply

SCKI

PD

V

CC

V

HP

AGND

HGND

( ) : PCM1771

TYPICAL PERFORMANCE CURVES

DIGITAL FILTER

Digital Filter (De-Emphasis Off)

AMPLITUDE

vs

FREQUENCY

0

FREQUENCY

0.05

0.04

−20

−40

0.03

0.02

0.01

−60

0.00

−80

−0.01

−0.02

−0.03

−0.04

−0.05

−100

−120

−140

0

1

2

3

4

0.0

0.1

0.2

0.3

0.4

0.5

f – Frequency [ꢀ f ]

S

Figure 1

Figure 2

All specifications at T = 25°C, V

CC

= V = 2.4 V, f = 44.1 kHz, system clock = 256 f and 24-bit data, R = 16 Ω, unless otherwise noted.

HP S S L

A

7

ꢀ ꢁꢂ ꢃ ꢄ ꢄ ꢅ

ꢄ

ꢀ

ꢁ

ꢂ

ꢃ

ꢄ

ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

TYPICAL PERFORMANCE CURVES

De-Emphasis Curves

DE-EMPHASIS ERROR

DE-EMPHASIS LEVEL

vs

FREQUENCY

0.5

0.4

0

−1

−2

−3

−4

−5

−6

−7

−8

−9

−10

0.3

0.2

0.1

−0.0

−0.1

−0.2

−0.3

−0.4

−0.5

0

2

4

6

8

10 12 14 16 18 20

0.0

0.1

0.2

0.3

0.4

0.5

0.6

f – Frequency – kHz

Figure 3

Figure 4

TOTAL HARMONIC DISTORTION + NOISE

DYNAMIC RANGE

vs

SUPPLY VOLTAGE

1.00

104

102

100

98

1

0 dB

0.10

0.1

–20 dB

96

94

92

1.2

0.01

1.2

1.6

2.0

2.4

2.8

3.2

3.6

4.0

1.6

2.0

2.4

2.8

3.2

3.6

4.0

V

CC

– Supply Voltage – V

V

CC

– Supply Voltage – V

Figure 5

Figure 6

All specifications at T = 25°C, V

= V = 2.4 V, f = 44.1 kHz, system clock = 256 f and 24-bit data, R = 16 Ω, unless otherwise noted.

HP S S L

A

CC

8

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢅ

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

TYPICAL PERFORMANCE CURVES

SNR

vs

CHANNEL SEPARATION

vs

SUPPLY VOLTAGE

104

102

100

98

78

76

74

72

70

68

66

96

94

92

1.2

1.6

2.0

2.4

2.8

3.2

3.6

4.0

1.2

1.6

2.0

2.4

2.8

3.2

3.6

4.0

V

CC

– Supply Voltage – V

V

CC

– Supply Voltage – V

Figure 7

Figure 8

TOTAL HARMONIC DISTORTION + NOISE

DYNAMIC RANGE

vs

FREE-AIR TEMPERATURE

1.00

1

102

101

100

99

0 dB

0.10

0.1

98

97

–20 dB

96

95

94

−40

0.01

−40

−20

0

20

40

60

80

100

−20

0

20

40

60

80

100

T

A

– Free-Air Temperature – °C

T

A

– Free-Air Temperature – °C

Figure 9

Figure 10

All specifications at T = 25°C, V

CC

= V = 2.4 V, f = 44.1 kHz, system clock = 256 f and 24-bit data, R = 16 Ω, unless otherwise noted.

HP S S L

A

9

ꢀ ꢁꢂ ꢃ ꢄ ꢄ ꢅ

ꢄ

ꢀ

ꢁ

ꢂ

ꢃ

ꢄ

ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

TYPICAL PERFORMANCE CURVES

SNR

vs

CHANNEL SEPARATION

vs

FREE-AIR TEMPERATURE

102

101

100

99

76

75

74

73

72

71

70

69

68

98

97

96

95

94

−40

−20

0

20

40

60

80

100

−40

−20

0

20

40

60

80

100

T

A

– Free-Air Temperature – °C

T

A

– Free-Air Temperature – °C

Figure 11

Figure 12

SUPPLY CURRENT

vs

SUPPLY VOLTAGE

20

18

16

14

12

10

8

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0

Operational

6

Power Down

4

2

0

1.2

1.6

2.0

2.4

2.8

3.2

3.6

4.0

V

CC

– Supply Current – V

Figure 13

All specifications at T = 25°C, V

= V = 2.4 V, f = 44.1 kHz, system clock = 256 f and 24-bit data, R = 16 Ω, unless otherwise noted.

HP S S L

A

CC

10

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢅ

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

TYPICAL PERFORMANCE CURVES

SUPPLY CURRENT

vs

SAMPLING FREQUENCY

20

18

16

14

12

10

8

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0

Operational

Power Down

6

4

2

0

10

20

30

40

50

f

S

– Sampling Frequency – kHz

Figure 14

DYNAMIC RANGE

vs

JITTER

100

99

98

97

96

95

94

0

100

200

300

400

500

600

700

Jitter – ps

Figure 15

All specifications at T = 25°C, V

CC

= V = 2.4 V, f = 44.1 kHz, system clock = 256 f and 24-bit data, R = 16 Ω, unless otherwise noted.

HP S S L

A

11

ꢀ ꢁꢂ ꢃ ꢄ ꢄ ꢅ

ꢄ

ꢀ

ꢁ

ꢂ

ꢃ

ꢄ

ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

TYPICAL PERFORMANCE CURVES

OUTPUT SPECTRUM (–60 dB, N = 8192)

0

−20

0

−20

−40

−60

−80

−100

−120

−140

−100

−120

−140

0

20

40

60

80

100

120

0

5

10

15

20

f – Frequency – kHz

Figure 16

Figure 17

All specifications at T = 25°C, V

= V = 2.4 V, f = 44.1 kHz, system clock = 256 f and 24-bit data, R = 16 Ω, unless otherwise noted.

HP S S L

A

CC

12

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢅ

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

DETAILED DESCRIPTION

SYSTEM CLOCK, RESET, AND FUNCTIONS

System Clock Input

The PCM1770 and PCM1771 devices require a system clock for operating the digital interpolation filters and multilevel ∆-Σ

modulators. The system clock is applied at terminal 16 (SCKI). Table 1 shows examples of system clock frequencies for

common audio sampling rates.

Figure 18 shows the timing requirements for the system clock input. For optimal performance, it is important to use a clock

source with low phase jitter and noise.

Table 1. System Clock Frequency for Common Audio Sampling Frequencies

SAMPLING FREQUENCY, LRCK

SYSTEM CLOCK FREQUENCY, SCKI (MHz)

128 f 192 f 256 f 384 f

S

48 kHz

44.1 kHz

32 kHz

6.144

5.6448

4.096

3.072

2.8224

2.048

1.536

1.4112

1.024

9.216

8.4672

6.144

4.608

4.2336

3.072

2.304

2.1168

1.536

12.288

11.2896

8.192

18.432

16.9344

12.288

9.216

24 kHz

6.144

22.05 kHz

16 kHz

5.6448

4.096

8.4672

6.144

12 kHz

3.072

4.608

11.025 kHz

8 kHz

2.8224

2.048

4.2336

3.072

t

(SCKH)

0.7 V

0.3 V

CC

SCKI

CC

t

(SCKL)

System Clock

Pulse Cycle Time

†

1/(128f ), 1/(192f ), 1/(256f ), and 1/(384f )

S

PARAMETERS

SYMBOL

MIN

7

UNIT

ns

System clock pulse width high

System clock pulse width low

t

(SCKH)

t

7

ns

(SCKL)

Figure 18. System Clock Timing

13

ꢀ ꢁꢂ ꢃ ꢄ ꢄ ꢅ

ꢄ

ꢀ

ꢁ

ꢂ

ꢃ

ꢄ

ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

POWER ON/OFF AND RESET

The PCM1770/71 always must have the PD pin set from LOW to HIGH once after power-supply voltages V and V

CC

HP

have reached the specified voltage range and stable clocks SCKI, BCK, and LRCK are being supplied for the power-on

sequence. A minimum time of 1 ms after both the clock and power-supply requirements are met is required before the PD

pin changes from LOW to HIGH, as shown in Figure 19. Subsequent to the PD LOW-to-HIGH transition, the internal logic

state is held in reset for 1024 system clock cycles prior to the start of the power-on sequence. During the power-on

sequence, H

L and H

R increase gradually from ground leved, reaching an output level that corresponds to the input

OUT

data after a period of 9334/f . When powering off, the PD pin is set from HIGH to LOW first. Then H

L and H

R

S

OUT

decrease gradually to ground level over a period of 9334/f , as shown in Figure 20, after which power can be removed

S

without creating pop noise. When powering on or off, adhering to the timing requirements of Figure 19 and Figure 20

ensures that pop noise does not occur. If the timing requirements are not met, pop noise might occur.

V , V

CC HP

0 V

1 ms (Min)

1024 Internal System Clocks

LRCK, BCK, SCKI

PD

Internal Reset

9334/f

S

0 V

H L, H R

OUT OUT

Figure 19. Power-On Sequence

V , V

CC HP

0 V

LRCK, BCK, SCKI

9334/f

S

PD

H L, H R

OUT OUT

0 V

Figure 20. Power-Off Sequence

14

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢅ

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

POWER-UP/-DOWN SEQUENCE AND RESET

The PCM1770 device has two kinds of power-up/-down methods: the PD terminal through hardware control and PWRD

(register 4, B0) through software control. The PCM1771 device has only the PD terminal through hardware control for the

power-up/-down sequence. The power-up or power-down sequence operates the same as the power-on or power-off

sequence. When powering up or down using the PD terminal, all digital circuits are reset. When powering up or down using

PWRD, all digital circuits are reset except for maintaining the logic states of the registers. Figure 21 shows the

power-up/power-down sequence.

2.4 V

V , V

CC HP

9334/f

S

LRCK, BCK, SCKI

PD

H L, H R

OUT OUT

0 V

Figure 21. Power-Down and Power-Up Sequences

15

ꢀ ꢁꢂ ꢃ ꢄ ꢄ ꢅ

ꢄ

ꢀ

ꢁ

ꢂ

ꢃ

ꢄ

ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

AUDIO SERIAL INTERFACE

The audio serial interface for the PCM1770 and PCM1771 devices consists of a 3-wire synchronous serial port. It includes

terminals 1 (LRCK), 2 (DATA), and 3 (BCK). BCK is the serial audio bit clock, and it clocks the serial data present on DATA

into the audio interface serial shift register. Serial data is clocked into the PCM1770 and PCM1771 devices on the rising

edge of BCK. LRCK is the serial audio left/right word clock. It latches serial data into the serial audio interface internal

registers.

Both LRCK and BCK of the PCM1770 device support the slave and master modes which are set by FMT (register 3). LRCK

and BCK are outputs during the master mode and inputs during the slave mode.

In slave mode, BCK and LRCK are synchronous to the audio system clock, SCKI. Ideally, it is recommended that LRCK

and BCK be derived from SCKI. LRCK is operated at the sampling frequency, f . BCK can be operated at 32, 48, and 64

S

times the sampling frequency.

In master mode, BCK and LRCK are derived from the system clock and these terminals are outputs. The BCK and LRCK

are synchronous to SCKI. LRCK is operated at the sampling frequency, f . BCK can be operated at 64 times the sampling

S

frequency.

The PCM1770 and PCM1771 devices operate under LRCK synchronized with the system clock. The PCM1770 and

PCM1771 devices do not need a specific phase relationship between LRCK and the system clock, but do require the

synchronization of LRCK and the system clock. If the relationship between the system clock and LRCK changes more than

3BCK during one sample period, internal operation of the PCM1770 and PCM1771 devices halt within 1/f , and the analog

S

output is kept in last data until resynchronization between system clock and LRCK is completed.

AUDIO DATA FORMATS AND TIMING

2

The PCM1770 device supports industry-standard audio data formats, including standard, I S, and left justified. The

2

PCM1771 device supports the I S and left-justified data formats. Table 2 lists the main features of the audio data interface.

Figure 22 shows the data formats. Data formats are selected using the format bits, FMT[2:0] of control register 3 in case

of the PCM1770 device, and are selected using the FMT terminal in case of the PCM1771 device. The default data format

is 24-bit, left-justified, slave mode. All formats require binary 2s complement, MSB-first audio data. Figure 23 shows a

detailed timing diagram for the serial audio interface in slave mode. Figure 24 shows a detailed timing diagram for the serial

audio interface in master mode.

Table 2. Audio Data Interface

AUDIO-DATA INTERFACE FEATURE

CHARACTERISTIC

2

Standard, I S, left justified

(PCM1770)

Audio data interface format

(PCM1771)

2

I S, left justified

Audio data bit length

Audio data format

16-, 20-, 24-bits selectable

MSB first, 2s complement

16

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢅ

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

(1) Standard Data Format; L-Channel = High, R-Channel = Low (Slave Mode)

1/f

S

LRCK

R-Channel

L-Channel

BCK

(= 32 f , 48 f or 64 f )

S

16-Bit Right-Justified, BCK = 32 f

S

DATA 14 15 16

1

2

3

14 15 16

1

2

3

14 15 16

LSB

MSB

LSB

16-Bit Right-Justified, BCK = 48 f or 64 f

S

1

2

3

DATA 14 15 16

1

2

3

14 15 16

LSB

14 15 16

LSB

MSB

20-Bit Right-Justified

DATA 18 19 20

1

2

3

18 19 20

LSB

1

2

3

18 19 20

LSB

MSB

24-Bit Right-Justified

DATA 22 23 24

1

2

3

22 23 24

LSB

1

2

3

22 23 24

LSB

MSB

2

(2) I S Data Format; L-Channel = Low, R-Channel = High (Slave Mode)

1/f

S

LRCK

BCK

L-Channel

R-Channel

(= 32 f , 48 f or 64 f

)

S

DATA

1

2

3

N−2 N−1

N

1

2

3

N−2 N−1

N

1

2

MSB

LSB

MSB

LSB

(3) Left-Justified Data Format; L-Channel = High, R-Channel = Low (Slave Mode)

1/f

S

LRCK

BCK

L-Channel

R-Channel

(= 32 f , 48 f or 64 f

)

S

DATA

1

2

3

N−2 N−1

N

1

2

3

N−2 N−1

N

1

2

MSB

LSB

MSB

LSB

(4) Left-Justified Data Format; L-Channel = High, R-Channel = Low (Master Mode)

(The frequency of BCK is 64f and SCKI is 256f only)

S

1/f

S

LRCK

BCK

L-Channel

R-Channel

(= 64 f

)

S

DATA

1

2

3

N−2 N−1

N

1

2

3

N−2 N−1

N

1

2

MSB

LSB

MSB

LSB

Figure 22. Audio Data Input Formats

17

ꢀ ꢁꢂ ꢃ ꢄ ꢄ ꢅ

ꢄ

ꢀ

ꢁꢂ

ꢃ

ꢄ

ꢃ

www.ti.com

50% of V

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

LRCK (Input)

CC

t

(BCL)

t

(BCH)

(LB)

50% of V

BCK (Input)

CC

t

(BCY)

(BL)

50% of V

DATA

t

(DS)

(DH)

PARAMETERS

SYMBOL

MIN

MAX

UNIT

(1)

BCK pulse cycle time

BCK high-level time

BCK low-level time

t

1/(64f )

S

(BCY)

t

35

10

ns

(BCH)

t

(BCL)

BCK rising edge to LRCK edge

LRCK edge to BCK rising edge

DATA set-up time

t

(BL)

(LB)

t

(DS)

(DH)

DATA hold time

t

(1)

f

S

is the sampling frequency.

Figure 23. Audio Interface Timing (Slave Mode)

18

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢅ

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

t

(SCY)

50% of V

CC

SCKI

t

(DL)

50% of V

CC

LRCK (Output)

BCK (Output)

DATA

t

(BCL)

t

(BCH)

(DB)

50% of V

CC

t

(BCY)

50% of V

CC

t

(DS)

t

(DH)

PARAMETERS

SYMBOL

MIN

MAX

UNIT

(1)

1/(256f )

S

SCKI pulse cycle time

t

(SCY)

LRCK edge from SCKI rising edge

BCK edge from SCKI rising edge

BCK pulse cycle time

BCK high-level time

t

0

40

ns

(DL)

(DB)

t

(1)

t

1/(64 f )

S

(BCY)

(BCH)

t

146

10

ns

BCK low-level time

t

(BCL)

DATA set-up time

t

(DS)

DATA hold time

t

10

(DH)

(1) f is up to 48 kHz. f is the sampling frequency.

S

Figure 24. Audio Interface Timing (Master Mode)

19

ꢀ ꢁꢂ ꢃ ꢄ ꢄ ꢅ

ꢄ

ꢀ

ꢁ

ꢂ

ꢃ

ꢄ

ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

HARDWARE CONTROL (PCM1771)

The digital functions of the PCM1771 device are capable of hardware control. Table 3 shows selectable formats, Table 4

shows de-emphasis control, and Table 5 shows analog mixing control.

Table 3. Data Format Select

FMT

Low

High

DATA FORMAT

16- to 24-bit, left-justified format

2

16- to 24-bit, I S format

Table 4. De-Emphasis Control

DEMP

Low

DE-EMPHASIS FUNCTION

44.1-kHz de-emphasis OFF

44.1-kHz de-emphasis ON

High

Table 5. Analog Mixing Control

AMIX

Low

ANALOG MIXING

Analog mixing OFF

Analog mixing ON

High

SOFTWARE CONTROL (PCM1770)

The PCM1770 device has many programmable functions that can be controlled in the software control mode. The functions

are controlled by programming the internal registers using MS, MC, and MD.

The software control interface is a 3-wire serial port that operates asynchronously to the serial audio interface. The serial

control interface is used to program the on-chip mode registers. MD is the serial data input, used to program the mode

registers. MC is the serial bit clock, used to shift data into the control port. MS is the mode control port select signal.

REGISTER WRITE OPERATION (PCM1770)

All write operations for the serial control port use 16-bit data words. Figure 25 shows the control data word format. The most

significant bit must be 0. There are seven bits, labeled IDX[6:0], that set the register index (or address) for the write

operation. The eight least significant bits, D[7:0], contain the data to be written to the register specified by IDX[6:0].

Figure 26 shows the functional timing diagram for writing to the serial control port. To write data into the mode register, data

is clocked into an internal shift register on the rising edge of the MC clock. Serial data can change on the falling edge of

the MC clock and must be stable on the rising edge of the MC clock. The MS signal must be low during the write mode

and the rising edge of the MS signal must be aligned with the falling edge of the last MC clock pulse in the 16-bit frame.

The MC clock can run continuously between transactions while the MS signal is low.

LSB

D0

MSB

0

IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0

Register Index (or Address)

D7

D6

D5

D4

D3

D2

D1

Register Data

Figure 25. Control Data Word Format for MD

20

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢅ

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

(1) Single Write Operation

16-Bits

MS

MC

MD

MSB

LSB

MSB

(2) Continuous Write Operation

16-Bits x N Frames

MS

MC

MD

MSB

LSB

MSB

LSB

MSB

LSB

N Frames

Figure 26. Register Write Operation

CONTROL INTERFACE TIMING REQUIREMENTS (PCM1770)

Figure 27 shows a detailed timing diagram for the serial control interface. These timing parameters are critical for proper

control port operation.

t

(MHH)

MS

50% of V

CC

t

(MCL)

(MLS)

t

(MLH)

(MCH)

MC

MD

50% of V

CC

t

(MCY)

LSB

CC

t

(MDS)

t

(MDH)

PARAMETERS

SYMBOL

MIN

(1)

TYP

MAX UNITS

MC pulse cycle time

MC low-level time

MC high-level time

MS high-level time

t

100

50

ns

(MCY)

t

(MCL)

t

50

(2)

20

15

20

(MCH)

(MHH)

MS falling edge to MC rising edge

MS hold time

t

(MLS)

(MLH)

(MDH)

t

MD hold time

t

MD set-up time

t

(MDS)

(1) When MC runs continuously between transactions, MC pulse cycle time is specified as 3/(128f ), where f is sampling rate.

S

(2) 3/(128f ) s (min), where f is sampling rate.

S

Figure 27. Control Interface Timing

21

ꢀ ꢁꢂ ꢃ ꢄ ꢄ ꢅ

ꢄ

ꢀ

ꢁ

ꢂ

ꢃ

ꢄ

ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

MODE CONTROL REGISTERS (PCM1770)

User-Programmable Mode Controls

The PCM1770 device has a number of user- programmable functions that can be accessed via mode control registers.

The registers are programmed using the serial control interface, as discussed in the SOFTWARE CONTROL (PCM1770)

section. Table 6 lists the available mode control functions, along with their reset default conditions and associated register

index.

Register Map

Table 7 shows the mode control register map. Each register includes an index (or address) indicated by the IDX[6:0] bits.

Table 6. User-Programmable Mode Controls

FUNCTION

Soft mute control, L/R independently

RESET DEFAULT

Disabled

REGISTER NO.

BIT(S)

01

MUTL, MUTR

ATL[5:0], ATR[5:0]

Digital attenuation level setting, 0 dB to –63 dB in 1-dB steps, L/R

independently

0 dB

01, 02

Oversampling rate control (128 f , 192 f , 256 f , 384 f )

128 f oversampling

S

03

04

OVER

RINV

S

Polarity control for analog output for R-channel DAC

Analog mixing control for analog in, AIN (terminal 14)

44.1-kHz de-emphasis control

Not inverted

Disabled

AMIX

Disabled

DEM

Audio data format select

24-bit, left-justified format

Disabled

FMT[2:0]

ZCAT

Zero cross attenuation

Power down control

Disabled

PWRD

Table 7. Mode Control Register Map

REGISTER

IDX [6:0]

B15 B14

B13

B12

B11

B10

B9

B8

B7

B6

B5

B4

B3

B2

B1

B0

(B14–B8)

Register 01

Register 02

Register 03

Register 04

01h

02h

03h

04h

0

IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 MUTR MUTL ATL5 ATL4 ATL3 ATL2

IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV

IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 OVER RSV

IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV RSV

ATL1

ATL0

ATR0

RSV ATR5 ATR4 ATR3 ATR2 ATR1

RINV AMIX DEM FMT2 FMT1 FMT0

RSV ZCAT RSV

RSV

RSV PWRD

NOTE: RSV: Reserved for test operation. It must be set to 0 during regular operation.

Register Definitions

B15 B14

B13

B12

B11

B10

B9

B8

B7

B6

B5

B4

B3

B2

B1

B0

Register 01

0

IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 MUTR MUTL ATL5 ATL4 ATL3 ATL2 ATL1 ATL0

IDX[6:0]: 000 0001b

MUTx: Soft Mute Control

Where, x = L or R, corresponding to the headphone output H

Default Value: 0

L and H

R.

OUT

MUTL, MUTR = 0

MUTL, MUTR = 1

Mute disabled (default)

Mute enabled

The mute bits, MUTL and MUTR, enable or disable the soft mute function for the corresponding headphone

outputs, H L and H R. The soft mute function is incorporated into the digital attenuators. When mute is

OUT

disabled (MUTx = 0), the attenuator and DAC operate normally. When mute is enabled by setting MUTx = 1, the

digital attenuator for the corresponding output are decreased from the current setting to the infinite attenuation,

one attenuator step (1 dB) at a time. This provides pop-free muting of the headphone output.

By setting MUTx = 0, the attenuator is increased one step at a time to the previously programmed attenuation

level.

22

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢅ

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

ATL[5:0]: Digital Attenuation Level Setting for Headphone Output, H

L

OUT

Default value: 11 1111b

Headphone output, H

L includes a digital attenuation function. The attenuation level can be set from 0 dB to

OUT

–62 dB, in 1.0-dB steps. Changes in attenuator levels are made by incrementing or decrementing by one step

(1.0 dB) for every 8/f time internal until the programmed attenuator setting is reached. Alternatively, the

S

attenuation level may be set to infinite attenuation (or mute).

The following table shows the attenuation levels for various settings:

ATL[5:0]

11 1111b

11 1110b

11 1101b

ꢀ

ATTENUATION LEVEL SETTING

0 dB, no attenuation (default)

–1.0 dB

–2.0 dB

ꢀ

00 0010b

00 0001b

00 0000b

–61.0 dB

–62.0 dB

Mute

B15 B14

B13

B12

B11

B10

B9

B8

B7

B6

B5

B4

B3

B2

B1

B0

Register 02

0

IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV

RSV ATR5 ATR4 ATR3 ATR2 ATR1 ATR0

IDX[6:0]: 000 0010b

ATR[5:0]: Digital Attenuation Level Setting for Headphone Output, H

R

OUT

Default Value: 11 1111b

Headphone output, H

R includes a digital attenuation function. The attenuation level can be set from 0 dB to

OUT

–62 dB, in 1-dB steps. Changes in attenuator levels are made by incrementing or decrementing by one step (1.0

dB) for every 8/f time internal until the programmed attenuator setting in reached. Alternatively, the attenuation

S

level can be set to infinite attenuation (or mute).

To set the attenuation levels for ATR[5:0], see the table for ATL[5:0], register 01.

B15 B14

B13

B12

B11

B10

B9

B8

B7

B6

B5

B4

B3

B2

B1

B0

Register 03

0

IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 OVER RSV

RINV AMIX DEM FMT2 FMT1 FMT0

IDX[6:0]: 000 0011b

OVER: Over Sampling Control

Default Value: 0

OVER = 0

OVER = 1

128 f oversampling

S

192 f , 256 f , 384 f oversampling

S

The OVER bit controls the oversampling rate of the ∆-Σ D/A converters. When it operates at a low sampling rate,

less than 24 kHz, this function is recommended.

RINV: Polarity Control for Headphone Output, H

R

OUT

Default Value: 0

RINV = 0

RINV = 1

Not inverted

Inverted output

The RINV bits allow the user to control the polarity of the headphone output, H

R. This function can be used to

OUT

connect the monaural speaker with BTL connection method. This bit is recommended to be 0 during the

power-up/-down sequence for minimizing audible pop noise.

23

ꢀ ꢁꢂ ꢃ ꢄ ꢄ ꢅ

ꢄ

ꢀ

ꢁ

ꢂ

ꢃ

ꢄ

ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

AMIX: Analog Mixing Control for External Analog Signal, AIN

Default Value: 0

AMIX = 0

AMIX = 1

Disabled (not mixed)

Enabled (mixing to the DAC output)

AMIX bit allows the user to mix analog input (AIN) with headphone outputs (H

DEM: 44.1-kHz De-emphasis Control

L/H

R) internally.

OUT

Default Value: 0

DEM = 0

DEM = 1

Disabled

Enabled

The DEM bit enables or disables the digital de-emphasis filter for 44.1-kHz sampling rate.

FMT[2:0]: Audio Interface Data Format

Default Value: 000

The FMT[2:0] bits select the data format for the serial audio interface. The following table shows the available

format options.

FMT[2:0]

Audio Data Format Selection

000

001

010

011

100

101

110

111

16- to 24-bit, left-justified format (default)

2

16- to 24-bit, I S format

24-bit right-justified data

20-bit right-justified data

16-bit right-justified data

16- to 24-bit, left-justified format, master mode

Reserved

B15 B14

B13

B12

B11

B10

B9

B8

B7

B6

B5

B4

B3

B2

B1

B0

Register 04

0

IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV

RSV

RSV ZCAT RSV

RSV RSV PWRD

IDX[6:0]: 000 0100b

ZCAT: Zero Cross Attenuation

Default Value: 0

ZCAT = 0

ZCAT = 1

Normal attenuation (default)

Zero cross attenuation

This bit enables the change signal level on zero crossing during attenuation control or muting. If the signal does

not cross BPZ beyond 512/f (11.6 ms at 44.1-kHz sampling rate), the signal level is changed similar to normal

S

attenuation control. This function is independently monitored for each channel; moreover, change of signal level

is alternated between both channels. Figure 28 shows an example of zero cross attenuation.

24

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢅ

ꢀ ꢁꢂ ꢃ ꢄꢄ ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

ATT CTRL START

L-Channel

(1.5 kHz)

R-Channel

(1 kHz)

Level Change Point

Figure 28. Example of Zero Cross Attenuation

PWRD: Power Down Control

Default Value: 0

PWRD = 0

PWRD = 1

Normal operation (default)

Power-down state

This bit is used to enter into low-power mode. Note that PWRD has no reset function.

When this bit is set to 1, the PCM1770 device enters low-power mode and all digital circuits are reset except the

register states which remain unchanged.

ANALOG IN/OUT

HEADPHONE OUTPUT (STEREO)

The PCM1770 and PCM1771 devices have two independent headphone amplifiers, and each amplifier output is provided

at the H

L and H

R terminals. Because the capability of the headphone output is designed for driving a 16-Ω

OUT

impedance headphone, less than a 16-Ω impedance headphone is not recommended. A resistor and a capacitor must be

connected to H L and H R to ensure proper output loading.

OUT

Monaural Output (BTL Mode/Monaural Speaker)

The monaural output can be created by summing left and right headphone outputs. When in the BTL mode, the user must

set each headphone output levels to −3 dB using ATL[5:0] bits on register 01 and ATR[5:0] bits on register 02. Moreover,

invert the polarity of the right headphone output by using the RINV bit on control register 03. The RINV bit is recommended

to be 0 during power-up/-down sequence for minimizing audible pop noise.

Analog Input

The PCM1770 and PCM1771 devices have an analog input, AIN (terminal 10). The AMIX bit (PCM1770) or the AMIX

terminal (PCM1771) allows the user to mix AIN with the headphone outputs (H

L and H

R) internally. When in the

OUT

MIXING mode, an ac-coupling capacitor is needed for AIN. But if AIN is not used, AIN must be open and the AMIX bit

(PCM1770) must be disabled or the AMIX terminal (PCM1771) must be low.

Because AIN does not have an internal low-pass filter, it is recommended that the bandwidth of the input signal into AIN

is limited to less than 100 kHz. The source of signals connected to AIN must be connected by low impedance.

Although the maximum input voltage on AIN is designed to be as large as 0.584 V [peak-to-peak], the user must attenuate

HP

the input voltage on AIN and control digital input data so that each headphone output (H

L and H

R) does not exceed

OUT

0.55 V [peak-to-peak] during mixing mode.

HP

V

Output

COM

One unbuffered common-mode voltage output terminal, V

is brought out for decoupling purposes. This terminal is

COM,

nominally biased to a dc voltage level equal to 0.5V and connected to a 10-µF capacitor. In the case of a capacitor smaller

HP

than 10 µF, pop noise can be generated during the power-on/-off or power-up/-down sequences.

25

ꢀ ꢁꢂ ꢃ ꢄ ꢄ ꢅ

ꢄ

ꢀ

ꢁ

ꢂ

ꢃ

ꢄ

ꢃ

www.ti.com

SLES011C – SEPTEMBER 2001 – REVISED MAY 2004

APPLICATION INFORMATION

CONNECTION DIAGRAMS

Figure 29 shows the basic connection diagram with the necessary power supply bypassing and decoupling components.

It is recommended that the component values shown in Figure 29 be used for all designs.

The use of series resistors (22 Ω to 100 Ω) are recommended for the MCKI, LRCK, BCK, and DATA inputs. The series

resistor combines with the stray PCB and device input capacitance to form a low-pass filter that reduces high frequency

noise emissions and helps to dampen glitches and ringing present on the clock and data lines.

POWER SUPPLIES AND GROUNDING

The PCM1770 and PCM1771 devices require a 2.4-V typical analog supply for V and V . These 2.4-V supplies power

CC

HP

the DAC, analog output filter, and other circuits. For best performance, these 2.4-V supplies must be derived from the

analog supply using a linear regulator, as shown in Figure 29.

Figure 29 shows the proper power supply bypassing. The 10-µF capacitors must be tantalum or aluminum electrolytic,

while the 0.1-µF capacitors are ceramic (X7R type is recommended for surface-mount applications).

1.6 V to 3.6 V

LRCK

DATA

BCK

SCKI

MS

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

Audio DSP

Controller

MC

PD

MD

PCM1770

AGND

HGND

V

CC

10 µF

V

HP

10 µF

V

COM

AIN

Analog In

H

OUT

R

H

L

OUT

10 µF

220 µF

0.022 µF

16 Ω

220 µF

Headphone

= 16 Ω

R

L

0.022 µF

16 Ω

Figure 29. Basic Connection Diagram

26

ꢀ ꢁꢂꢃꢄ ꢅꢆꢂ ꢄꢇ ꢈ ꢄꢉꢄ

MPQF110 − SEPTEMBER 2001

RGA (S-PQFP-N20)

PLASTIC QUAD FLATPACK

4,30

4,10

4,05

3,95

0,50 NOM/2

A

“A”

B

4,30

4,10

DETAIL “A”

4,05

3,95

0,50 NOM

1,00 NOM

20

“C”

0,25

0,09

0,95

0,50

1,00

MAX

1

S

C0,70

0,50 NOM

Index

1,00 NOM

0,75

0,45

0,05

0,00

S

0,05

DETAIL “B”

“B”

0,27

0,17

M

S AB

0,05

0,21

0,09

0,05

0,00

0,25

0,09

0,35 0,11

0,23

0,17

0,27

0,17

0,69 0,11

DETAIL “C”

0,22 0,05

4202802/B 08/01

NOTES: A. All linear dimensions are in millimeters.

B. This drawing is subject to change without notice.

C. These dimensions include package bend.

D. Falls within EIAJ: EDR-7324.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

MECHANICAL DATA

MTSS001C – JANUARY 1995 – REVISED FEBRUARY 1999

PW (R-PDSO-G**)

PLASTIC SMALL-OUTLINE PACKAGE

14 PINS SHOWN

0,30

0,19

M

0,10

0,65

14

8

0,15 NOM

4,50

4,30

6,60

6,20

Gage Plane

0,25

1

7

0°–8°

A

0,75

0,50

Seating Plane

0,10

0,15

0,05

1,20 MAX

PINS **

8

14

16

20

24

28

DIM

3,10

2,90

5,10

4,90

5,10

4,90

6,60

6,40

7,90

9,80

9,60

A MAX

A MIN

7,70

4040064/F 01/97

NOTES: A. All linear dimensions are in millimeters.

B. This drawing is subject to change without notice.

C. Body dimensions do not include mold flash or protrusion not to exceed 0,15.

D. Falls within JEDEC MO-153

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,

enhancements, improvements, and other changes to its products and services at any time and to discontinue

any product or service without notice. Customers should obtain the latest relevant information before placing

orders and should verify that such information is current and complete. All products are sold subject to TI’s terms

and conditions of sale supplied at the time of order acknowledgment.

TI warrants performance of its hardware products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI

deems necessary to support this warranty. Except where mandated by government requirements, testing of all

parameters of each product is not necessarily performed.

TI assumes no liability for applications assistance or customer product design. Customers are responsible for

their products and applications using TI components. To minimize the risks associated with customer products

and applications, customers should provide adequate design and operating safeguards.

TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,

copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process

in which TI products or services are used. Information published by TI regarding third-party products or services

does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.

Use of such information may require a license from a third party under the patents or other intellectual property

of the third party, or a license from TI under the patents or other intellectual property of TI.

Reproduction of information in TI data books or data sheets is permissible only if reproduction is without

alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction

of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for

such altered documentation.

Resale of TI products or services with statements different from or beyond the parameters stated by TI for that

product or service voids all express and any implied warranties for the associated TI product or service and

is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.

Following are URLs where you can obtain information on other Texas Instruments products and application

solutions:

Products

Applications

Audio

Amplifiers

amplifier.ti.com

www.ti.com/audio

Data Converters

dataconverter.ti.com

Automotive

www.ti.com/automotive

DSP

dsp.ti.com

Broadband

Digital Control

Military

www.ti.com/broadband

www.ti.com/digitalcontrol

www.ti.com/military

Interface

Logic

interface.ti.com

logic.ti.com

Power Mgmt

Microcontrollers

power.ti.com

Optical Networking

Security

www.ti.com/opticalnetwork

www.ti.com/security

www.ti.com/telephony

www.ti.com/video

microcontroller.ti.com

Telephony

Video & Imaging

Wireless

www.ti.com/wireless

Mailing Address:

Texas Instruments

Post Office Box 655303 Dallas, Texas 75265


型号：	PCM1771RGA
厂家：	TEXAS INSTRUMENTS
描述：	LOW VOLTAGE AND POWER STEREO AUDIO DIGITAL TO ANALOG CONVER WITH HEADPHONE AMPLIFER 低电压和功耗立体声音频数模转换器CONVER ，带有耳机放大器转换器数模转换器放大器
文件：	总29页 (文件大小：308K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

PCM1771RGA [TI]

相关型号：

SI9130DB

SI9135LG-T1

SI9135LG-T1-E3

SI9135_11

SI9136_11

SI9130CG-T1-E3

SI9130LG-T1-E3

SI9130_11

SI9137

SI9137DB

SI9137LG

SI9122E