LTC1597ACN_技术文档

LTC1591/LTC1597

14-Bit and 16-Bit Parallel

Low Glitch Multiplying DACs

with 4-Quadrant Resistors

DESCRIPTION

U

FEATURES

The LTC^®1591/LTC1597 are pin compatible, parallel input

14-bit and 16-bit multiplying current output DACs that oper-

atefromasingle5Vsupply.INLandDNLareaccurateto1LSB

over the industrial temperature range in both 2- and 4-

quadrant multiplying modes. True 16-bit 4-quadrant multi-

plication is achieved with on-chip 4-quadrant multiplication

resistors.

■

True 16-Bit Performance Over Industrial

Temperature Range

DNL and INL: 1LSB Max

On-Chip 4-Quadrant Resistors Allow Precise 0V to

10V, 0V to –10V or ±10V Outputs

Pin Compatible 14- and 16-Bit Parts

Asynchronous Clear Pin

■

LTC1591/LTC1597: Reset to Zero Scale

LTC1591-1/LTC1597-1: Reset to Midscale

Glitch Impulse < 2nV-s

TheseDACsincludeaninternaldeglitchercircuitthatreduces

theglitchimpulsetolessthan2nV-s(typ).Theasynchronous

CLR pin resets the LTC1591/LTC1597 to zero scale and

LTC1591-1/LTC1597-1 to midscale.

■

28-Lead SSOP Package

Low Power Consumption: 10µW Typ

The LTC1591/LTC1597 are available in 28-pin SSOP and

PDIPpackagesandarespecifiedovertheindustrialtempera-

ture range.

^{Power-On Reset}U

APPLICATIONS

For serial interface 16-bit current output DACs refer to the

LTC1595/LTC1596 data sheet.

■

Process Control and Industrial Automation

■

Direct Digital Waveform Generation

, LTC and LT are registered trademarks of Linear Technology Corporation.

■

Software-Controlled Gain Adjustment

■

Automatic Test Equipment

U

LTC1591/LTC1591-1 Integral Nonlinearity

1.0

TYPICAL APPLICATION

V

= 10V

= ±10V BIPOLAR

REF

OUT

0.8

0.6

16-Bit, 4-Quadrant Multiplying DAC with a

Minimum of External Components

0.4

0.2

0

–0.2

–0.4

–0.6

–0.8

–1.0

V

REF

5V

+

0.1µF

LT^®1468

–

15pF

0

8192

12288

4096

16383

DIGITAL INPUT CODE

5

3

2

1

23

4

1591/97 TA02

R1

R

REF

V

CC

R

COM

R2

OFS

FB

15pF

LTC1597/LTC1597-1 Integral Nonlinearity

1.0

R

OFS

FB

R1

V

= 10V

= ±10V BIPOLAR

REF

OUT

I

0.8

0.6

–

OUT1

6

V

=

OUT

–V

16

LTC1597-1

LT1468

DATA

16-BIT DAC

REF

0.4

+

TO V

AGND

22

INPUTS

7

REF

0.2

10 TO 21,

24 TO 27

DGND

0

–0.2

–0.4

–0.6

–0.8

–1.0

WR LD CLR

28

1591/97 TA01

9

8

WR

LD

CLR

0

32768

49152

16384

65535

DIGITAL INPUT CODE

1591/97 TA03

1

LTC1591/LTC1597

W W U W

ABSOLUTE MAXIMUM RATINGS _{(Note 1)}

V_CCto AGND............................................... – 0.5V to 7V

Operating Temperature Range

V

_CCto DGND .............................................. –0.5V to 7V

LTC1591C/LTC1591-1C

AGND to DGND............................................. V_CC+ 0.5V

DGND to AGND............................................. V_CC+ 0.5V

REF, R_OFS, R_FB, R1, R_COMto AGND, DGND .......... ±25V

Digital Inputs to DGND ............... –0.5V to (V_CC+ 0.5V)

I_OUT1to AGND ............................ –0.5V to( V_CC+ 0.5V)

Maximum Junction Temperature .......................... 125°C

LTC1597C/LTC1597-1C.......................... 0°C to 70°C

LTC1591I/LTC1591-1I

LTC1597I/LTC1597-1I ....................... –40°C to 85°C

Storage Temperature Range ................ –65°C to 150°C

Lead Temperature (Soldering, 10 sec)................. 300°C

U

W U

PACKAGE/ORDER INFORMATION

ORDER PART

NUMBER

TOP VIEW

REF

1

2

3

4

5

6

7

8

9

28 CLR

27 NC

26 NC

25 D0

24 D1

REF

1

2

3

4

5

6

7

8

9

28 CLR

27 D0

26 D1

25 D2

24 D3

LTC1591CG

LTC1591CN

LTC1591IG

LTC1597ACG

LTC1597ACN

LTC1597BCG

LTC1597BCN

LTC1597-1ACG

LTC1597-1ACN

LTC1597-1BCG

LTC1597-1BCN

LTC1597AIG

R

I

COM

R1

COM

R1

R

OFS

LTC1591IN

R

FB

R

FB

I

23

V

23

V

CC

LTC1591-1CG

LTC1591-1CN

LTC1591-1IG

LTC1591-1IN

OUT1

CC

OUT1

AGND

22 DGND

21 D2

20 D3

19 D4

18 D5

17 D6

16 D7

15 D8

AGND

22 DGND

21 D4

20 D5

19 D6

18 D7

17 D8

16 D9

15 D10

LD

WR

D13 10

D12 11

D11 12

D10 13

D9 14

D15 10

D14 11

D13 12

D12 13

D11 14

LTC1597AIN

LTC1597BIG

LTC1597BIN

G PACKAGE

N PACKAGE

G PACKAGE

N PACKAGE

LTC1597-1AIG

LTC1597-1AIN

LTC1597-1BIG

LTC1597-1BIN

28-LEAD PLASTIC SSOP 28-LEAD NARROW PDIP

T_JMAX= 125°C, θ_JA= 95°C/ W (G)

_JMAX= 125°C, θ_JA= 70°C/ W (N)

T_JMAX= 125°C, θ_JA= 95°C/ W (G)

_JMAX= 125°C, θ_JA= 70°C/ W (N)

T

Consult factory for Military grade parts.

2

LTC1591/LTC1597

ELECTRICAL CHARACTERISTICS

V_CC= 5V ±10%, V_REF= 10V, I_OUT1= AGND = DGND = 0V, T_A= T_MINto T_MAX, unless otherwise noted.

LTC1591/-1 LTC1597B/-1B

MIN TYP MAX MIN TYP MAX MIN TYP MAX

LTC1597A/-1A

SYMBOL PARAMETER

Accuracy

CONDITIONS

UNITS

Resolution

●

14

16

Bits

Monotonicity

INL

DNL

GE

Integral Nonlinearity

(Note 2) T = 25°C

±1

± 2

±2

±0.25 ±1

±0.35 ±1

LSB

A

T

to T

●

MIN

MAX

Differential Nonlinearity

Gain Error

T = 25°C

± 1

±1

±0.2 ±1

LSB

A

T

to T

MIN

MAX

Unipolar Mode

(Note 3) T = 25°C

±4

±6

±16

±24

2

3

±16

LSB

A

T

to T

●

MIN

MAX

Bipolar Mode

(Note 3) T = 25°C

±4

±6

±16

±24

2

3

±16

± 16

LSB

A

T

to T

●

MIN

MAX

Gain Temperature Coefficient (Note 4) ∆Gain/∆Temperature

1

2

1

2

1

2

ppm/°C

Bipolar Zero-Scale Error

T = 25°C

± 3

± 5

± 10

± 16

± 5

± 8

LSB

A

T

to T

●

MIN

MAX

I

OUT1 Leakage Current

(Note 5) T = 25°C

±5

±15

±5

±15

±5

±15

nA

LKG

A

T

to T

●

MIN

MAX

PSRR

Power Supply Rejection Ratio

V

= 5V ±10

±0.1 ±1

±0.4 ±2

LSB/V

CC

V_CC= 5V ±10%, V_REF= 10V, I_OUT1= AGND = DGND = 0V, T_A= T_MINto T_MAX, unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Reference Input

R

DAC Input Resistance (Unipolar)

R1/R2 Resistance (Bipolar)

(Note 6)

●

4.5

9

6

12

10

20

kΩ

REF

R1/R2

, R

(Notes 6, 13)

(Note 6)

R

Feedback and Offset Resistances

9

OFS FB

AC Performance (Note 4)

Output Current Settling Time

(Notes 7, 8)

(Note 12)

(Note 9)

1

2

µs

nV-s

Midscale Glitch Impulse

Digital-to-Analog Glitch Impulse

Multiplying Feedthrough Error

Total Harmonic Distortion

Output Noise Voltage Density

1

V

= ±10V, 10kHz Sine Wave

1

mV

P-P

REF

THD

(Note 10)

(Note 11)

108

10

dB

nV/√Hz

Harmonic Distortion

(Digital Waveform Generation)

Unipolar Mode (Note 14)

2nd Harmonic

3rd Harmonic

SFDR

94

101

94

dB

Bipolar Mode (Note 14)

2nd Harmonic

3rd Harmonic

SFDR

94

101

94

dB

3

LTC1591/LTC1597

ELECTRICAL CHARACTERISTICS

V_CC= 5V ±10%, V_REF= 10V, I_OUT1= AGND = DGND = 0V, T_A= T_MINto T_MAX, unless otherwise noted.

SYMBOL

Analog Outputs (Note 4)

Output Capacitance (Note 4)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

C

OUT

DAC Register Loaded to All 1s: C

DAC Register Loaded to All 0s: C

●

115

70

130

80

pF

OUT1

Digital Inputs

V

Digital Input High Voltage

Digital Input Low Voltage

Digital Input Current

●

2.4

V

IH

IL

0.8

±1

8

I

0.001

µA

pF

IN

C

IN

Digital Input Capacitance

(Note 4) V = 0V

IN

Timing Characteristics

t

Data to WR Setup Time

Data to WR Hold Time

WR Pulse Width

●

60

0

20

–12

25

ns

DS

DH

60

110

60

0

WR

LD

LD Pulse Width

55

Clear Pulse Width

WR to LD Delay Time

40

CLR

LWD

Power Supply

V

Supply Voltage

Supply Current

●

4.5

5

5.5

10

V

DD

I

Digital Inputs = 0V or V

µA

DD

CC

The

range.

●

denotes specifications that apply over the full operating temperature

Note 9: V = 0V. DAC register contents changed from all 0s to all 1s or

all 1s to all 0s.

REF

Note 1: Absolute Maximum Values are those beyond which the life of a

Note 10: V = 6V

at 1kHz. DAC register loaded with all 1s.

RMS

REF

device may be impaired.

Note 11: Calculation from e = √4kTRB where: k = Boltzmann constant

n

Note 2: ±1LSB = ±0.006% of full scale = ±61ppm of full scale for the

LTC1591/LTC1591-1. ±1LSB = ±0.0015% of full scale = ±15.3ppm of full

scale for the LTC1597/LTC1597-1.

(J/°K), R = resistance (Ω), T = temperature (°K), B = bandwidth (Hz).

Note 12: Midscale transition code: 01 1111 1111 1111 to 10 0000 0000

0000 for the LTC1591/LTC1591-1 and 0111 1111 1111 1111 to 1000

0000 0000 0000 for the LTC1597/LTC1597-1.

Note 3: Using internal feedback resistor.

Note 4: Guaranteed by design, not subject to test.

Note 13: R1 and R2 are measured between R1 and R

, REF and R

.

COM

Note 5: I

with DAC register loaded to all 0s.

Note 14: Measured using the LT1468 op amp in unipolar mode for I/V

converter and LT1468 I/V and LT1001 reference inverter in bipolar mode.

Sample Rate = 50kHz, Signal Frequency = 1kHz, V = 5V, T = 25°C.

(OUT1)

Note 6: Typical temperature coefficient is 100ppm/°C.

Note 7: I load = 100Ω in parallel with 13pF.

REF

A

OUT1

Note 8: To 0.006% for a full-scale change, measured from the rising edge

of LD for the LTC1591/LTC1591-1. To 0.0015% for a full-scale change,

measured from the rising edge of LD for the LTC1597/LTC1597-1.

4

LTC1591/LTC1597

TYPICAL PERFOR A CE CHARACTERISTICS ^{(LTC1591/LTC1597)}

U W

Unipolar Multiplying Mode

Signal-to-(Noise + Distortion)

vs Frequency

Midscale Glitch Impulse

Full-Scale Settling Waveform

–40

–50

40

30

20

10

V

C

= 5V USING AN LT1468

= 30pF

USING AN LT1468

CC

C

V

= 30pF

FEEDBACK

REFERENCE = 6V

FEEDBACK

= 10V

REF

RMS

LD PULSE

5V/DIV

–60

–70

0

GATED

SETTLING

WAVEFORM

500µV/DIV

–80

1nV-s TYPICAL

–10

500kHz FILTER

–90

–20

–30

–40

1591/97 G02

80kHz FILTER

–100

–110

500ns/DIV

USING LT1468 OP AMP

C_FEEDBACK= 20pF

0V to 10V STEP

30kHz FILTER

10k 100k

0.2

0.4

0.8

10

100

1k

0

1.0

0.6

FREQUENCY (Hz)

TIME (µs)

1591/97 G03

1591/97 G01

Bipolar Multiplying Mode

Signal-to-(Noise + Distortion)

vs Frequency, Code = All Zeros

Bipolar Multiplying Mode

Signal-to-(Noise + Distortion)

vs Frequency, Code = All Ones

–40

–50

–40

–50

V

C

= 5V USING TWO LT1468s

V

C

= 5V USING TWO LT1468s

FEEDBACK

REFERENCE = 6V

RMS

CC

= 15pF

FEEDBACK

REFERENCE = 6V

RMS

–60

–70

–80

500kHz FILTER

–90

80kHz FILTER

30kHz FILTER

–100

–110

–100

–110

80kHz FILTER

30kHz

FILTER

10

100

1k

10k

100k

10

100

1k

10k

100k

FREQUENCY (Hz)

1591/97 G05

1591/97 G04

Supply Current vs Input Voltage

Logic Threshold vs Supply Voltage

3.0

2.5

2.0

1.5

1.0

0.5

0

5

V

CC

= 5V

ALL DIGITAL INPUTS

TIED TOGETHER

4

3

2

1

0

2

3

4

5

6

7

0

1

2

3

4

5

1

SUPPLY VOLTAGE (V)

INTPUT VOLTAGE (V)

1591/97 G07

1591/97 G06

5

LTC1591/LTC1597

U W

TYPICAL PERFOR A CE CHARACTERISTICS ^(LTC1591)

Integral Nonlinearity

vs Reference Voltage

in Unipolar Mode

Integral Nonlinearity (INL)

Differential Nonlinearity (DNL)

1.0

0.8

1.0

0.8

1.0

0.8

0.6

0.4

0.2

0

–0.2

–0.4

–0.6

–0.8

–1.0

–0.2

–0.4

–0.6

–0.8

–1.0

–0.2

–0.4

–0.6

–0.8

–1.0

0

8192

12280

4096

16383

0

8192

12280

–10 –8 –6 –4 –2

0

2

4

6

8

10

4096

16383

DIGITAL INPUT CODE

REFERENCE VOLTAGE (V)

1591 G01

1591 G02

1591 G03

Differential Nonlinearity

vs Reference Voltage

in Unipolar Mode

Differential Nonlinearity

vs Reference Voltage

in Bipolar Mode

Integral Nonlinearity

vs Reference Voltage

in Bipolar Mode

1.0

0.8

1.0

0.8

1.0

0.8

0.6

0.4

0.2

0

–0.2

–0.4

–0.6

–0.8

–1.0

–0.2

–0.4

–0.6

–0.8

–1.0

–0.2

–0.4

–0.6

–0.8

–1.0

–10 –8 –6 –4 –2

0

2

4

6

8

10

–10 –8 –6 –4 –2

0

2

4

6

8

10

–10 –8 –6 –4 –2

0

2

4

6

8

10

REFERENCE VOLTAGE (V)

1591 G04

1591 G05

1591 G06

Integral Nonlinearity vs

Supply Voltage in Unipolar Mode

Integral Nonlinearity vs

Supply Voltage in Bipolar Mode

Differential Nonlinearity vs

Supply Voltage in Unipolar Mode

1.0

0.8

1.0

0.8

1.0

0.8

0.6

0.4

V

REF

= 10V

V

REF

= 10V

REF

0.2

V

= 10V

REF

V

= 2.5V

V

= 2.5V

V

= 2.5V

REF

0

= 10V

= 2.5V

V

= 10V

= 2.5V

REF

V

= 2.5V

REF

–0.2

–0.4

–0.6

–0.8

–1.0

–0.2

–0.4

–0.6

–0.8

–1.0

–0.2

–0.4

–0.6

–0.8

–1.0

V

REF

= 10V

V

0

2

3

4

5

6

7

0

2

3

4

5

6

7

0

2

3

4

5

6

7

1

SUPPLY VOLTAGE (V)

1591 G07

1591 G08

1591 G09

6

LTC1591/LTC1597

U W

TYPICAL PERFOR A CE CHARACTERISTICS ^(LTC1591)

Differential Nonlinearity vs

Supply Voltage in Bipolar Mode

Unipolar Multiplying Mode Frequency

Response vs Digital Code

1.0

0.8

0

–20

ALL BITS ON

D13 ON

D12 ON

D11 ON

D10 ON

D9 ON

D8 ON

D7 ON

D6 ON

D5 ON

D4 ON

D3 ON

D2 ON

D1 ON

0.6

0.4

–40

0.2

V

= 10V

REF

V

= 2.5V

0

REF

–60

= 10V

= 2.5V

REF

–0.2

–0.4

–0.6

–0.8

–1.0

V

REF

–80

D0 ON

–100

ALL BITS OFF

–120

0

2

3

4

5

6

7

1

100

1k

10k

100k

1M

10M

SUPPLY VOLTAGE (V)

FREQUENCY (Hz)

1591G11

1591 G10

V_REF

30pF

3

2

1 4 5

6

–

LTC1591

LT1468

+

V_OUT

7

22

Bipolar Multiplying Mode Frequency

Response vs Digital Code

Bipolar Multiplying Mode Frequency

Response vs Digital Code

0

–20

0

–20

ALL BITS ON

ALL BITS OFF

D12 ON

D13 AND D12 ON

D13 AND D11 ON

D13 AND D10 ON

D13 AND D9 ON

D13 AND D8 ON

D13 AND D7 ON

D13 AND D6 ON

D13 AND D5 ON

D13 AND D4 ON

D13 AND D3 ON

D13 AND D2 ON

D13 AND D1 ON

D13 AND D0 ON

D12 AND D11 ON

D12 TO D10 ON

D12 TO D9 ON

D12 TO D8 ON

D12 TO D7 ON

D12 TO D6 ON

D12 TO D5 ON

D12 TO D4 ON

D12 TO D3 ON

D12 TO D2 ON

D12 TO D1 ON

D12 TO D0 ON

–40

–60

–80

D13 ON

*

CODES FROM MIDSCALE TO FULL SCALE

CODES FROM MIDSCALE TO ZERO SCALE

–100

10

100

1k

10k

100k 1M

10M

10

100

1k

10k

100k 1M

10M

FREQUENCY (Hz)

1591G13

1591 G12

*DAC ZERO VOLTAGE OUTPUT LIMITED BY BIPOLAR

ZERO ERROR TO –84dB TYPICAL (–70dB MAX)

*DAC ZERO VOLTAGE OUTPUT LIMITED BY BIPOLAR

ZERO ERROR TO –84dB TYPICAL (–70dB MAX)

V

REF

V

REF

+

LT1468

–

LT1468

–

V

OUT

V

OUT

12pF

15pF

–

LT1468

+

15pF

–

LT1468

+

3

2

1 4 5

3

2

1 4 5

6

LTC1591

7

22

7

22

7

LTC1591/LTC1597

U W

TYPICAL PERFOR A CE CHARACTERISTICS ^(LTC1597)

Integral Nonlinearity

vs Reference Voltage

in Unipolar Mode

Integral Nonlinearity (INL)

Differential Nonlinearity (DNL)

1.0

0.8

1.0

0.8

1.0

0.8

0.6

0.4

0.2

0

–0.2

–0.4

–0.6

–0.8

–1.0

–0.2

–0.4

–0.6

–0.8

–1.0

–0.2

–0.4

–0.6

–0.8

–1.0

0

32768

49152

16384

65535

0

32768

49152

–10 –8 –6 –4 –2

0

2

4

6

8

10

16384

65535

DIGITAL INPUT CODE

REFERENCE VOLTAGE (V)

1597 G01

1597 G02

1597 G03

Differential Nonlinearity

vs Reference Voltage

in Unipolar Mode

Differential Nonlinearity

vs Reference Voltage

in Bipolar Mode

Integral Nonlinearity

vs Reference Voltage

in Bipolar Mode

1.0

0.8

1.0

0.8

1.0

0.8

0.6

0.4

0.2

0

–0.2

–0.4

–0.6

–0.8

–1.0

–0.2

–0.4

–0.6

–0.8

–1.0

–0.2

–0.4

–0.6

–0.8

–1.0

–10 –8 –6 –4 –2

0

2

4

6

8

10

–10 –8 –6 –4 –2

0

2

4

6

8

10

–10 –8 –6 –4 –2

0

2

4

6

8

10

REFERENCE VOLTAGE (V)

1597 G04

1597 G06

1597 G05

Integral Nonlinearity vs

Supply Voltage in Unipolar Mode

Integral Nonlinearity vs

Supply Voltage in Bipolar Mode

Differential Nonlinearity vs

Supply Voltage in Unipolar Mode

2.0

1.5

1.0

0.8

1.0

0.8

0.6

1.0

0.4

V

= 10V

0.4

REF

V

= 10V

REF

0.5

V

= 10V

REF

0.2

V

= 2.5V

REF

V

= 2.5V

REF

V

REF

= 2.5V

0

REF

V

REF

= 10V

–0.2

–0.4

–0.6

–0.8

–1.0

–0.2

–0.4

–0.6

–0.8

–1.0

V

= 10V

= 2.5V

– 0.5

–1.0

–1.5

–2.0

REF

V

= 2.5V

REF

3

4

5

6

7

2

3

4

5

7

2

3

4

5

6

7

2

6

SUPPLY VOLTAGE (V)

1597 G08

1597 G09

1597 G07

8

LTC1591/LTC1597

U W

TYPICAL PERFOR A CE CHARACTERISTICS ^(LTC1597)

Differential Nonlinearity vs

Supply Voltage in Bipolar Mode

Unipolar Multiplying Mode Frequency

Response vs Digital Code

1.0

0.8

0

–20

ALL BITS ON

D15 ON

D14 ON

D13 ON

D12 ON

D11 ON

D10 ON

D9 ON

D8 ON

D7 ON

D6 ON

D5 ON

0.6

0.4

–40

0.2

V

= 10V

REF

0

–60

V

= 2.5V

REF

–0.2

–0.4

–0.6

–0.8

–1.0

D4 ON

D3 ON

D2 ON

D1 ON

REF

–80

–100

–120

D0 ON

ALL BITS OFF

2

3

4

5

6

7

100

1k

10k

100k

1M

10M

SUPPLY VOLTAGE (V)

FREQUENCY (Hz)

1597G11

1597 G10

V_REF

30pF

3

2 1 4 5

6

–

LTC1597

LT1468

+

V_OUT

7

22

Bipolar Multiplying Mode Frequency

Response vs Digital Code

Bipolar Multiplying Mode Frequency

Response vs Digital Code

0

–20

–40

–60

–80

0

ALL BITS ON

ALL BITS OFF

D14 ON

D15 AND D14 ON

D15 AND D13 ON

D15 AND D12 ON

D15 AND D11 ON

D15 AND D10 ON

D15 AND D9 ON

D15 AND D8 ON

D15 AND D7 ON

D15 AND D6 ON

D15 AND D5 ON

D15 AND D4 ON

D15 AND D3 ON

D15 AND D2 ON

D14 AND D13 ON

D14 TO D12 ON

D14 TO D11 ON

D14 TO D10 ON

D14 TO D9 ON

D14 TO D8 ON

D14 TO D7 ON

D14 TO D6 ON

D14 TO D5 ON

D14 TO D4 ON

D14 TO D3 ON

D14 TO D2 ON

D14 TO D1 ON

–20

–40

–60

CODES FROM

MIDSCALE

TO ZERO SCALE

MIDSCALE

TO FULL SCALE

–80

D15 AND D1 ON

D15 AND D0 ON

D14 TO D0 ON

D15 ON

*

–100

10

100

1k

10k

100k 1M

10M

10

100

1k

10k

100k 1M

10M

FREQUENCY (Hz)

1597 G12

1597 G13

*DAC ZERO VOLTAGE OUTPUT LIMITED BY BIPOLAR

ZERO ERROR TO –96dB TYPICAL (–78dB MAX, A GRADE)

*DAC ZERO VOLTAGE OUTPUT LIMITED BY BIPOLAR

ZERO ERROR TO –96dB TYPICAL (–78dB MAX, A GRADE)

V

REF

V

REF

+

LT1468

–

LT1468

–

V

OUT

V

OUT

12pF

15pF

–

15pF

–

3

2

1 4 5

3

2

1 4 5

6

LTC1597

LT1468

+

LTC1597

LT1468

+

7

22

7

22

9

LTC1591/LTC1597

U

PIN FUNCTIONS

I_OUT1(Pin 6): DAC Current Output. Tie to the inverting

LTC1591

input of the current to voltage converter op amp.

REF(Pin1):Reference Inputand4-QuadrantResistorR2.

Typically ±10V, accepts up to ±25V. In 2-Quadrant mode

this is the reference input. In 4-quadrant mode, this pin is

driven by external inverting reference amplifier.

AGND (Pin 7): Analog Ground. Tie to ground.

LD(Pin8):DACDigitalInputLoadControlInput. WhenLD

is taken to a logic high, data is loaded from the input

register into the DAC register, updating the DAC output.

R_COM(Pin 2): Center Tap Point of the Two 4-Quadrant

Resistors R1 and R2. Normally tied to the inverting input

ofanexternalamplifierin4-quadrantoperation, otherwise

shorted to the REF pin. See Figures 1a and 2a.

WR (Pin 9):DAC Digital Write Control Input. When WR is

taken to a logic low, data is loaded from the digital input

pins into the 14-bit wide input register.

R1 (Pin 3): 4-Quadrant Resistor R1. In 2-quadrant opera-

tion short to the REF pin. In 4-quadrant mode tie to R_OFS

(Pin 4).

DB13 to D2 (Pins 10 to 21): Digital Input Data Bits.

DGND (Pin 22): Digital Ground. Tie to ground.

V

_CC(Pin23):ThePositiveSupplyInput.4.5V≤V_CC≥5.5V.

R_OFS(Pin 4): Bipolar Offset Resistor. Typically swings

±10V, accepts up to ±25V. In 2-quadrant operation tie to

R_FB. In 4-quadrant operation tie to R1.

Requires a bypass capacitor to ground.

DB1, DB0 (Pins 24, 25): Digital Input Data Bits.

NC (Pins 26, 27): No Connect.

R_FB(Pin5):FeedbackResistor.Normallytiedtotheoutput

of the current to voltage converter op amp. Swings to

±V_REF. V_REFis typically ±10V.

CLR (Pin 28):Digital Clear Control Function for the DAC.

When CLR is taken to a logic low, it sets the DAC output

and all internal registers to zero code for the LTC1591 and

midscale code for the LTC1591-1.

I_OUT1(Pin 6): DAC Current Output. Tie to the inverting

LTC1597

input of the current to voltage converter op amp.

REF(Pin1):ReferenceInput and4-QuadrantResistorR2.

Typically ±10V, accepts up to ±25V. In 2-Quadrant mode

this is the reference input. In 4-quadrant mode, this pin is

driven by external inverting reference amplifier.

AGND (Pin 7): Analog Ground. Tie to ground.

LD(Pin8):DACDigitalInputLoadControlInput. WhenLD

is taken to a logic high, data is loaded from the input

register into the DAC register, updating the DAC output.

R_COM(Pin 2): Center Tap Point of the Two 4-Quadrant

Resistors R1 and R2. Normally tied to the inverting input

ofanexternalamplifierin4-quadrantoperation, otherwise

shorted to the REF pin. See Figures 1b and 2b.

WR (Pin 9):DAC Digital Write Control Input. When WR is

taken to a logic low, data is loaded from the digital input

pins into the 16-bit wide input register.

R1 (Pin 3): 4-Quadrant Resistor R1. In 2-quadrant opera-

tion short to the REF pin. In 4-quadrant mode tie to R_OFS

(Pin 4).

DB15 to D4 (Pins 10 to 21): Digital Input Data Bits.

DGND (Pin 22): Digital Ground. Tie to ground.

V_CC(Pin23):ThePositiveSupplyInput.4.5V≤V_CC≥5.5V.

Requires a bypass capacitor to ground.

R_OFS(Pin 4): Bipolar Offset Resistor. Typically swings

±10V, accepts up to ±25V. In 2-quadrant operation tie to

R_FB. In 4-quadrant operation tie to R1.

DB3 to DB0 (Pins 24 to 27): Digital Input Data Bits.

CLR (Pin 28):Digital Clear Control Function for the DAC.

When CLR is taken to a logic low, it sets the DAC output

and all internal registers to zero code for the LTC1597 and

midscale code for the LTC1597-1.

R_FB(Pin5):FeedbackResistor.Normallytiedtotheoutput

of the current to voltage converter op amp. Swings to

±V_REF. V_REFis typically ±10V.

10

LTC1591/LTC1597

TRUTH TABLE

Table 1

CONTROL INPUTS

CLR WR

LD

REGISTER OPERATION

0

1

X

0

1

0

X

Reset Input and DAC Register to All 0s for LTC1591/LTC1597 and Midscale for LTC1591-1/LTC1597-1 (Asynchronous Operation)

Load Input Register with All 14/16 Data Bits

0

1

Load DAC Register with the Contents of the Input Register

1

Input and DAC Register Are Transparent

CLK = LD and WR Tied Together. The 14/16 Data Bits Are Loaded into the Input Register on the Falling Edge of the CLK and Then

Loaded into the DAC Register on the Rising Edge of the CLK

1

0

No Register Operation

W

BLOCK DIAGRA SM

LTC1591

48k

REF

R

FB

1

2

3

5

4

12k

96k

12k

48k

96k

R

OFS

R

COM

R1

6

7

I

OUT1

V

CC

AGND

23

DECODER

22 DGND

28 CLR

D13

D12

D11

D10

D9

• • •

D0

(LSB)

(MSB)

LD

LOAD

8

9

RST

DAC REGISTER

WR

INPUT REGISTER

WR

1591 BD

10

11

21

24

D1

25

26

NC

27

• • • •

D13

D12

D2

D0

NC

11

LTC1591/LTC1597

W

BLOCK DIAGRA SM

LTC1597

48k

REF

R

FB

1

2

3

5

4

12k

96k

12k

48k

96k

R

OFS

R

COM

R1

6

7

I

OUT1

V

CC

AGND

23

DECODER

22 DGND

28 CLR

D15

D14

D13

D12

D11

• • •

D0

(LSB)

(MSB)

LOAD

RST

LD

8

9

DAC REGISTER

WR

INPUT REGISTER

WR

1597 BD

10

11

21

24

25

26

D1

27

• • • •

D15

D14

D4

D3

D2

D0

W U

TI I G DIAGRA

W

t

WR

DATA

LD

t

DS

t

DH

t

LWD

t

LD

t

CLR

1591/97TD

12

LTC1591/LTC1597

U

W U U

APPLICATIONS INFORMATION

Description

Digital Section

TheLTC1591/LTC1597are14-/16-bitmultiplying,current

output DACswithafullparallel14-/16-bitdigitalinterface.

The devices operate from a single 5V supply and provide

both unipolar 0V to –10V or 0V to 10V and bipolar ±10V

output ranges from a 10V or –10V reference input. They

have three additional precision resistors on chip for bipo-

lar operation. Refer to the block diagrams regarding the

following description.

The LTC1591/LTC1597 are 14-/16-bit wide full parallel

data bus inputs. The devices are double-buffered with two

14-/16-bit registers. The double-buffered feature permits

the update of several DACs simultaneously. The input

register is loaded directly from a 16-bit microprocessor

bus when the WR pin is brought to a logic low level. The

second register (DAC register) is updated with the data

from the input register when the LD pin is brought to a

logic high level. Updating the DAC register updates the

DAC output with the new data. To make both registers

transparent for flowthrough mode, tie WR low and LD

high. However, this defeats the deglitcher operation and

output glitch impulse may increase. The deglitcher is

activated on the rising edge of the LD pin. The versatility

of the interface also allows the use of the input and DAC

registers in a master slave or edge-triggered configura-

tion. This mode of operation occurs when WR and LD are

tied together. The asynchronous clear pin resets the

LTC1591/LTC1597 to zero scale and the LTC1591-1/

LTC1597-1 to midscale. CLR resets both the input and

DAC registers. These devices also have a power-on reset.

Table 1 shows the truth table for the LTC1591/LT1597.

The14-/16-bitDACsconsistofaprecisionR-2Rladderfor

the 11/13LSBs. The 3MSBs are decoded into seven seg-

ments of resistor value R. Each of these segments and the

R-2R ladder carries an equally weighted current of one

eighth of full scale. The feedback resistor R_FBand

4-quadrant resistor R_OFShave a value of R/4. 4-quadrant

resistors R1 and R2 have a magnitude of R/4. R1 and R2

together with an external op amp (see Figure 2) inverts the

referenceinputvoltageandappliesittothe14-/16-bitDAC

input REF, in 4-quadrant operation. The REF pin presents

a constant input impedance of R/8 in unipolar mode and

R/12inbipolarmode.Theoutputimpedanceofthecurrent

output pin I_OUT1varies with DAC input code. The I_OUT1

capacitance due to the NMOS current steering switches

also varies with input code from 70pF to 115pF. An added

feature of these devices, especially for waveform genera-

tion, is a proprietary deglitcher that reduces glitch energy

to below 2nV-s over the DAC output voltage range.

Unipolar Mode

(2-Quadrant Multiplying, V_OUT= 0V to –V_REF

)

The LTC1591/LTC1597 can be used with a single op amp

to provide 2-quadrant multiplying operation as shown in

Figure 1. With a fixed –10V reference, the circuits shown

give a precision unipolar 0V to 10V output swing.

5V

0.1µF

V

REF

5

2

3

1

23

4

R1

R

COM

REF

V

CC

R

FB

OFS

33pF

Unipolar Binary Code Table

R

OFS

FB

R1

R2

I

–

+

OUT1

DIGITAL INPUT

BINARY NUMBER

IN DAC REGISTER

6

ANALOG OUTPUT

V

=

OUT

14

V

OUT

LTC1591

14-BIT DAC

LT1001

0V TO

–V

DATA

AGND

22

INPUTS

7

REF

MSB

LSB

11

00

1111 1111 1111

1000 0000 0000

0000 0000 0000

–V (16,383/16,384)

REF

10 TO 21,

24, 25

–V (8,192/16,384) = –V

/2

REF

DGND

REF

01

00

–V (1/16,384)

REF

0V

WR LD CLR

28

NC NC

26 27

1591/97 F01a

9

8

WR

LD

CLR

Figure 1a. Unipolar Operation (2-Quadrant Multiplication) V_OUT= 0V to –V_REF

13

LTC1591/LTC1597

U

W U U

APPLICATIONS INFORMATION

5V

0.1µF

V

REF

5

2

3

1

23

4

R1

R

REF

V

CC

R

FB

R

COM

R2

OFS

33pF

Unipolar Binary Code Table

R

FB

OFS

R1

I

–

OUT1

6

DIGITAL INPUT

BINARY NUMBER

IN DAC REGISTER

V

=

ANALOG OUTPUT

OUT

16

V

LTC1597

16-BIT DAC

LT1001

0V TO

OUT

DATA

+

AGND

22

INPUTS

7

–V

REF

MSB

LSB

1111

0000

0001

0000

1111 1111 1111

1000 0000 0000

0000 0000 0000

–V

REF

–V

REF

–V

REF

0V

(65,535/65,536)

(32,768/65,536) = –V /2

(1/65,536)

10 TO 21,

24 TO 27

DGND

REF

WR LD CLR

28

1591/97 F01b

9

8

WR

LD

CLR

Figure 1b. Unipolar Operation (2-Quadrant Multiplication) V_OUT= 0V to –V_REF

Bipolar Mode

(4-Quadrant Multiplying, V_OUT= –V_REFto V_REF

offset, and a degradation of full-scale error equal to twice

the op amp offset. For the LTC1597, the same 500µV op

amp offset (2mV offset for LTC1591) will cause a 3.3LSB

zero-scale error and a 6.5LSB full-scale error with a 10V

full-scale range.

)

The LTC1591/LTC1597 contain on chip all the 4-quadrant

resistors necessary for bipolar operation. 4-quadrant

multiplying operation can be achieved with a minimum of

external components, a capacitor and a dual op amp, as

shown in Figure 2. With a fixed 10V reference, the circuit

shown gives a precision bipolar –10V to 10V output

swing.

Op amp input bias current (I_BIAS) contributes only a zero-

scale error equal to I_BIAS(R_{FB/ OFS}) = I_BIAS(6k). For a

R

thorough discussion of 16-bit DAC settling time and op

amp selection, refer to Application Note 74, “Component

and Measurement Advances Ensure 16-Bit DAC Settling

Time.”

Op Amp Selection

Because of the extremely high accuracy of the 14-/16-bit

LTC1591/LTC1597, thought should be given to op amp

selection in order to achieve the exceptional performance

of which the part is capable. Fortunately, the sensitivity of

INL and DNL to op amp offset has been greatly reduced

compared to previous generations of multiplying DACs.

Reference Input and Grounding

For optimum performance the reference input of the

LTC1597 should be driven by a source impedance of less

than 1kΩ. However, these DACs have been designed to

minimize source impedance effects. An 8kΩ source im-

pedance degrades both INL and DNL by 0.2LSB.

Op amp offset will contribute mostly to output offset and

gain and will have minimal effect on INL and DNL. For the

LTC1597,a500µVopampoffsetwillcauseabout0.55LSB

INLdegradationand0.15LSBDNLdegradationwitha10V

full-scale range. The main effects of op amp offset will be

a degradation of zero-scale error equal to the op amp

As with any high resolution converter, clean grounding is

important. A low impedance analog ground plane and star

grounding should be used. AGND must be tied to the star

ground with as low a resistance as possible.

14

LTC1591/LTC1597

U

W U U

APPLICATIONS INFORMATION

V

REF

5V

+

0.1µF

1/2 LT1112

–

2

5

3

1

23

4

R1

R

V

CC

REF

R

FB

COM

OFS

33pF

Bipolar Offset Binary Code Table

R

OFS

FB

R1

R2

DIGITAL INPUT

BINARY NUMBER

IN DAC REGISTER

I

–

OUT1

6

ANALOG OUTPUT

V

=

V

OUT

–V

14

OUT

14-BIT DAC

LTC1591-1

1/2 LT1112

+

DATA

REF

MSB

LSB

11

01

AGND

22

INPUTS

7

TO V

REF

1111 1111

1000 0000

0111 1111

0000 0000

1111

0000

V

(8,191/8,192)

(1/8,192)

REF

10 TO 21,

24, 25

DGND

0000

1111

0000

00 0V

11 –V (1/8,192)

00 –V

REF

WR LD CLR

28

NC NC

26 27

REF

1591/97 F02a

9

8

WR

LD

CLR

Figure 2a. Bipolar Operation (4-Quadrant Multiplication) V_OUT= –V_REFto V_REF

V

REF

5V

+

0.1µF

1/2 LT1112

–

2

5

3

1

23

4

R1

R

V

CC

REF

R

FB

COM

OFS

33pF

Bipolar Offset Binary Code Table

R

OFS

FB

R1

R2

DIGITAL INPUT

BINARY NUMBER

IN DAC REGISTER

I

–

OUT1

6

ANALOG OUTPUT

V

=

V

OUT

–V

16

OUT

LTC1597-1

1/2 LT1112

+

16-BIT DAC

DATA

REF

MSB

LSB

1111 V (32,767/32,768)

AGND

22

INPUTS

7

TO V

REF

1111 1111 1111

1000 0000 0000

0111 1111 1111

0000 0000 0000

REF

0001V (1/32,768)

REF

10 TO 21,

24 TO 27

DGND

00000V

1111–V (1/32,768)

REF

WR LD CLR

28

0000–V

REF

1591/97 F02b

9

8

WR

LD

CLR

Figure 2b. Bipolar Operation (4-Quadrant Multiplication) V_OUT= –V_REFto V_REF

15

LTC1591/LTC1597

TYPICAL APPLICATIONS

U

Noninverting Unipolar Operation (2-Quadrant Multiplication) V_OUT= 0V to V_REF

5V

+

0.1µF

1/2 LT1112

–

2

5

1

23

4

REF

V

CC

R

COM

R

OFS

FB

33pF

R1

3

V

REF

R

FB

OFS

R1

R2

I

–

OUT1

6

16

V

=

OUT

0V TO V

16-BIT DAC

LTC1597

1/2 LT1112

+

DATA

REF

AGND

22

INPUTS

7

10 TO 21,

24 TO 27

DGND

WR LD CLR

28

1591/97 F06

9

8

WR

LD

CLR

16

LTC1591/LTC1597

U

TYPICAL APPLICATIONS

16-Bit V_OUTDAC Programmable Unipolar/Bipolar Configuration

16

15

14

LTC203AC

3

UNIPOLAR/

BIPOLAR

1

2

+

LT1468

2

–

15V

LT1236A-10

4

6

5V

+

0.1µF

LT1001

–

3

2

1

23

4

5

R

COM

R1

REF

V

R

OFS

R

CC

FB

15pF

R

FB

OFS

R1

R2

I

–

OUT1

6

16

LTC1597

LT1468

V

OUT

16-BIT DAC

DATA

+

AGND

INPUTS

7

10 TO 21,

24 TO 27

22

DGND

WR LD CLR

28

1591/97 F04

9

8

WR

LD

CLR

17

LTC1591/LTC1597

U

TYPICAL APPLICATIONS

Digital Waveform Generator

2

4

15V

LT1236A-10

6

+

–

5V

LT1001

0.1µF

3

2

5

1

23

4

R

V

CC

R1

REF

R

COM

R2

PHASE ACCUMULATOR

OFS

FB

15pF

n

FREQUENCY CONTROL

R

OFS

FB

R1

I

–

OUT1

6

PARALLEL

SERIAL

OR BYTE

LOAD

REGISTER

n

SIN ROM

LOOKUP

TABLE

16

DELTA

PHASE

REGISTER

M

LOWPASS

FILTER

PHASE

REGISTER

16-BIT DAC

LTC1597

LT1468

DATA

Σ

+

AGND

22

INPUTS

7

(M)(f )

C

2

f

=

O

CLOCK

n

10 TO 21,

24 TO 27

DGND

PHASE

n = 24 TO 32 BITS

TRUNCATION

16 BITS

WR LD CLR

28

1591/97 F05

9

8

f

O

18

LTC1591/LTC1597

U

PACKAGE DESCRIPTION

Dimensions in inches (millimeters) unless otherwise noted.

G Package

28-Lead Plastic SSOP (0.209)

(LTC DWG # 05-08-1640)

0.397 – 0.407*

(10.07 – 10.33)

28 27 26 25 24 23 22 21 20 19 18

16 15

17

0.301 – 0.311

(7.65 – 7.90)

5

7

8

1

2

3

4

6

9 10 11 12 13 14

0.205 – 0.212**

(5.20 – 5.38)

0.068 – 0.078

(1.73 – 1.99)

0° – 8°

0.0256

(0.65)

BSC

0.005 – 0.009

(0.13 – 0.22)

0.022 – 0.037

(0.55 – 0.95)

0.002 – 0.008

(0.05 – 0.21)

0.010 – 0.015

(0.25 – 0.38)

*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH

SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

**DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD

FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

G28 SSOP 0694

N Package

28-Lead PDIP (Narrow 0.300)

(LTC DWG # 05-08-1510)

1.370*

(34.789)

MAX

28 27 26 25 24

23 22 21 20

19 18 17 16 15

0.255 ± 0.015*

(6.477 ± 0.381)

1

2

3

4

5

6

7

8

9

10 11 12 13 14

0.300 – 0.325

(7.620 – 8.255)

0.045 – 0.065

(1.143 – 1.651)

0.130 ± 0.005

(3.302 ± 0.127)

0.020

(0.508)

MIN

0.065

(1.651)

TYP

0.009 – 0.015

(0.229 – 0.381)

+0.035

0.125

(3.175)

MIN

0.005

(0.127)

MIN

0.100 ± 0.010

(2.540 ± 0.254)

0.018 ± 0.003

(0.457 ± 0.076)

0.325

–0.015

+0.889

8.255

N28 1197

(

)

–0.381

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

19

LTC1591/LTC1597

TYPICAL APPLICATION

U

17-Bit Sign Magnitude DAC with Bipolar Zero Error of 140µV (0.92LSB at 17 Bits) at 25°C

16

15

14

LTC203AC

2

4

15V

1

2

3

LT1236A-10

6

5V

+

0.1µF

LT1468

–

15pF

3

2

5

1

4

23

R

R1

REF

V

CC

R

FB

COM

R2

OFS

SIGN

BIT

20pF

R

FB

OFS

R1

I

–

OUT1

6

16

DATA

INPUTS

16-BIT DAC

V

OUT

LTC1597

LT1468

+

AGND

7

10 TO 21,

24 TO 27

22

DGND

WR LD CLR

28

1591/97 F03

9

8

WR

LD

CLR

RELATED PARTS

PART NUMBER

DESCRIPTION

Precision Operational Amplifier

COMMENTS

Op Amps

LT1001

Low Offset, Low Drift

LT1112

Dual Low Power, Precision Picoamp Input Op Amp

90MHz, 22V/µs, 16-Bit Accurate Op Amp

Serial 16-Bit Current Output DACs

Serial 16-Bit Voltage Output DAC

Serial 14-Bit Voltage Output DAC

14-Bit, 200ksps 5V Sampling ADC

16-Bit, 333ksps Sampling ADC

Low Offset, Low Drift

LT1468

Precise, 1µs Settling to 0.0015%

Low Glitch, ±1LSB Maximum INL, DNL

Low Noise and Glitch Rail-to-Rail VOUT

DACs

LTC1595/LTC1596

LTC1650

LTC1658

LTC1418

LTC1604

LTC1605

Low Power, 8-Lead MSOP Rail-to-Rail VOUT

16mW Dissipation, Serial and Parallel Outputs

±2.5V Input, SINAD = 90dB, THD = 100dB

Low Power, ±10V Inputs

ADCs

Single 5V, 16-Bit 100ksps ADC

References LT1236

Precision Reference

Ultralow Drift, 5ppm/°C, High Accuracy 0.05%

15917f LT/TP 1298 4K • PRINTED IN USA

LINEAR TECHNOLOGY CORPORATION 1998

20 ^{Linear Technology Corporation}

1630 McCarthy Blvd., Milpitas, CA 95035-7417

●

(408)432-1900 FAX:(408)434-0507 www.linear-tech.com


型号：	LTC1597ACN
厂家：	Linear
描述：	14-Bit and 16-Bit Parallel Low Glitch Multiplying DACs with 4-Quadrant Resistors 14位和16位并行低干扰乘法数模转换器与4象限电阻转换器数模转换器
文件：	总20页 (文件大小：389K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LTC1597ACN [Linear]

相关型号：

SI9130DB

SI9135LG-T1

SI9135LG-T1-E3

SI9135_11

SI9136_11

SI9130CG-T1-E3

SI9130LG-T1-E3

SI9130_11

SI9137

SI9137DB