FSA321UMX_技术文档

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March 2013

FSA321 — USB2.0 Hi-Speed (480Mbps) and

Audio Switches with Negative Signal Capability and

Built-in Termination on Unselected Audio Paths

Features

Description

The FSA321 is a Double-Pole, Double Throw (DPDT)

multiplexer that combines a low-distortion audio and a

USB2.0 High-Speed (HS) switch path. This configuration

enables audio and USB data to share a common

connector port. The architecture is designed to allow

audio signals to swing below ground. This means a

common USB and headphone jack can be used for

personal media players and portable peripheral devices.

.

Audio: 1.8 Typical On Resistance

HS-USB: 8 Typical On Resistance

HS-USB: 5pF Typical On Capacitance

USB Path -3db Bandwidth: > 720MHz

Negative Swing Capable Audio Channel

Power-off Protection on Common D+/R, D-/L Ports

Automatic USB Detection (Configurable)

OVT on all I/O Ports

Since USB2.0 is an industry standard for shared data-

path in portable devices, FSA321 can be configured for

automatic V_BUSdetection. The FSA321 includes a

power-off feature as well as over-voltage tolerance to

Flow-Through Pin Out Eliminates PCB Vias

minimize current consumption when V_SWexceeds V_CC

.

Built-In Termination on Unselected Audio Paths

to Inhibit Audio Pop

Typical applications involve switching in portables and

consumer applications, such as cell phones, digital

cameras, and notebooks with hubs or controllers.

Applications

.

MP3, Cell Phone, PDA, Digital Camera, and

Notebook

.

LCD Monitor, TV, and Set-Top Box

Ordering Information

Package

Part Number

Top Mark

Package Description

Number

FSA321UMX

MLP010A

GL

10-Lead Quad, Ultrathin Molded Leadless Package (MLP), 1.4 x 1.8mm

Figure 1. Analog Symbol

www.fairchildsemi.com

FSA321 • Rev 1.0.6

Pin Configuration

R

2

D-

1

3

4

10 D+

L

GND

9

8

V_CC

A/LP Sel

5

USB Sel

6

7

D-/L D+/R

Figure 2. UMLP

Pin Definitions

Pin #

Name

Description

9

V_CC

Power supply

Audio Select Override and Power-Save Mode. This pin can be used to override USB Sel for

applications where analog audio is transmitted on the USB D+, D- lines. This same select pin is

5

A/LP Sel used to put the FSA321 in low-power mode when USB Sel is LOW, not transmitting audio signals

or USB data. The FSA321 has a weak internal pull-down, setting its default state to LOW and

allowing this pin to float when not in use.

8

USB Sel USB Path select pin. Can be connected to USB connector V_BUSpin for automatic USB detection.

10, 1

2, 3

7, 6

D+, D-

R, L

USB data bus input sources

Audio right and left input sources

D+/R, D-/L USB and audio common connector ports

Truth Table

V_CC

USB Sel⁽¹⁾

A/LP Sel

Audio Mode

USB Mode

Remarks

LOW

HIGH⁽²⁾

Notes:

OFF

ON

OFF

ON

Disabled Inputs High-Z

USB Communication

Audio Override on USB

Low Power Mode

Audio Out

HIGH⁽²⁾

LOW

HIGH⁽²⁾

LOW

OFF

ON

LOW

1. Forcing USB Sel HIGH when V_BUSis present allows for automatic USB detection.

2. HIGH is the threshold as defined to meet USB2.0 V_CCrequirements and audio supply threshold in a system

(see DC Tables).

www.fairchildsemi.com

FSA321 • Rev.1.0.6

2

Functional Description

The FSA321 is a combined USB and audio switch that

enables sharing the D+/D- lines of a USB connector with

stereo audio CODEC outputs. The USB Sel pin has an

internal pull-down resistor that results in a default audio-

mode configuration. The switch can be configured for

auto USB detection by connecting the V_BUSpin to the

USB Sel pin. The audio switch path also handles

negative signals, eliminating the need for large coupling

capacitors and greatly reducing the potential for audio

pop. Termination resistors on the audio R and L ports

are enabled when the switch is in USB mode, this also

helps reduce audio pop when enabling the audio path.

The FSA321 allows for an audio override state by

forcing A/LP Sel high when USB Sel is high. This is

useful for USB car kit applications or if the device is in a

cradle charger when “Send/End” is pressed.

Application Diagram

V_CC

0.1µF

USB 2.0

Hi-Speed

D+

USB Sel

D+/R

Controller

D-

FSA321

D-/L

R

L

Audio

CODEC

Figure 3. Typical Application Diagram

www.fairchildsemi.com

FSA321 • Rev.1.0.6

3

Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be

operable above the recommended operating conditions and stressing the parts to these levels is not recommended.

In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.

The absolute maximum ratings are stress ratings only.

Symbol

Parameter

Min.

Max.

Unit

V_CC

Supply Voltage

-0.5

4.6

6.0

4.6

V

USB Sel

A/LP Sel

USB Select Control Signal

Power Save Mode Control Signal

-0.5

USB Path Active

Audio Path Active

USB Path Active

Audio Path Active

-1.0

Switch I/O Voltage⁽³⁾

V_CC-4.6V

V_SW

V

DC Switch I/O Voltage⁽³⁾

-0.50

5.25

I_IK

Input Clamp Diode Current

Switch I/O Current (Continuous)

-50

50

mA

C

USB

I_SW

Audio

USB

100

Peak Switch Current (Pulsed at

1ms Duration, <10% Duty Cycle)

I_SWPEAK

Audio

250

T_STG

T_J

Storage Temperature Range

-65

+150

+260

Maximum Junction Temperature

C

T_L

Lead Temperature (Soldering, 10 seconds)

I/O to GND

Human Body Model,

JEDEC: JESD22-A114

C

11

8

All Other Pins

VCC to GND

12

2

ESD

kV

Charged Discharge Model, JEDEC: JESD22-C101

Air Gap

Contact

15

8

USB Connection Pins

IEC61000-4-2 System

(D+/R, D-/L, V_BUS

)

Note:

3. The input and output negative ratings may be exceeded if the input and output diode current ratings are

observed.

Recommended Operating Conditions

The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended

operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not

recommend exceeding them or designing to Absolute Maximum Ratings.

Symbol

Parameter

Min.

Max.

Units

V_CC

Supply Voltage

1.8

4.3

5.5

4.3

+85

284

V

USB Sel USB Select Control Signal

0

A/LP Sel Power-Save Mode Control Signal

0

V

USB Path Active

Audio Path Active

V

V_SW

Switch I/O Voltage

V_CC-4.3V

-40

V

T_A

Operating Temperature

ºC

ºC/W

Thermal Resistance (Free Air)

UMLP

_JA

www.fairchildsemi.com

FSA321 • Rev.1.0.6

4

DC Electrical Characteristics

All typical values are at 25ºC unless otherwise specified.

T_A= - 40 to +85°C

Min. Typ.⁽⁶⁾Max.

Symbol

Parameter

V_CC(V)

Conditions

Unit

Common Pins

V_IK

Clamp Diode Voltage

1.8 to 4.3 I_IK= -18mA

1.8 to 2.7

-1.2

1.0

1.2

0.3

0.5

V_IH

Control Input Voltage HIGH

V

2.7 to 4.3

1.8 to 2.7

V_IL

Control Input Voltage LOW

2.7 to 4.3

V_IN= 0V

1.8 to 4.3

-1

1

USB Sel and A/LP Sel Input

Current

I_IN

µA

V_IN= 5.5V

10

D+/R, D-/L Common Ports,

I_OFF

Power Off Leakage Current

0

V_SW= 0V to 5.5V,

All other Pins = 0V

25

A/LP Sel and USB Sel Internal

Pull-Down Resistors

R_PD

R_T

1.8 to 4.3

3

M

Audio Path Termination

Resistors

200



USB Switch Path

USB Analog Signal Range

R_ONUSBHS Switch On Resistance⁽⁴⁾

1.8 to 4.3

0

4.3

11

V

Ω

1.8 to 4.3 V_D+/D- = 0V, 0.4V, I_ON= 8mA

1.8 to 4.3 V_D+/D-= 0V, I_ON= 8mA

8

(5,6)

∆R_ONUSBHS Delta R_ON

0.4

Audio Switch Path

V_CC-

4.3V

Audio Analog Signal Range

1.8 to 4.3

V_CC

2.7

V

V_L/R= -1.0V, 0V, 1.0V

I_ON= 60mA

R_ONAudioAudio Switch On Resistance

2.7

1.8

Ω

(5)

∆R_ONAudioAudio Delta R_ON

2.7 to 4.3 V_L/R= 0.7V I_ON= 60mA

2.7 to 4.3 I_ON= 60mA

0.4

0.8

Ω

R_FLAT(Audio)Audio R_ONFlatness⁽⁷⁾

1.5

Total Switch Current Consumption

A/LP Sel = LOW_,

USB Sel= HIGH, I_OUT= 0

I_CC

USB Active Mode Supply Current 1.8 to 4.3

0.5

10

0.8

15

mA

µA

USB Low Power Mode or Audio

Mode Quiescent Supply Current

A/LP Sel = HIGH,

1.8 to 4.3

I_{CC_LPM}

V_CC= 1.8-4.3V

Increase in I_CCcurrent per

control voltage and V_CCLOW

POWER Mode A/LP Sel HIGH

V_{USB Sel}= 2.6V

10

15

20

µA

V_{USB Sel}= 1.8V

4.3

I_CCT

Increase in I_CCcurrent per

control voltage and V_CC

ACTIVE Mode A/LP Sel LOW

V_{USB Sel}= 2.6V

0.6

0.9

1.00

mA

V_{USB Sel}= 1.8V

0.65

Notes:

4. On resistance is determined by the voltage drop between the A and B pins at the indicated current through the switch.

5. ∆ R_ON= R_{ON max}– R_{ON min}measured at identical V_CC, temperature, and voltage. Worst-case signal path, audio or

USB channel, is characterized.

6. Guaranteed by characterization, not production tested.

7. Flatness is defined as the difference between the maximum and minimum values of on resistance over the

specified range of conditions.

www.fairchildsemi.com

FSA321 • Rev.1.0.6

5

AC Electrical Characteristics

All typical value are for V_CC= 3.3V at 25ºC unless otherwise specified.

T_A= - 40 to +85°C

Symbol

Parameter

V_CC(V)

Conditions

Unit

Min. Typ.⁽⁸⁾Max.

R_L= 50Ω, C_L= 0pF

Figure 9

t_PDUSB

USB Switch Propagation Delay⁽⁸⁾

3.3

0.25

-110

ns

Non-Adjacent Channel Crosstalk

(Audio Mode)

f = 20kHz, R_T= 32Ω,

C_L= 0pF, Figure 17

dB

Xtalk_A

f = 240MHz,

R_T= 20Ω, C_L= 0pF

Figure 17

Non-Adjacent Channel Crosstalk

(USB Mode)

3.3

-45

dB

f = 20kHz, R_T= 32Ω,

C_L= 0pF

Off Isolation (Audio Mode)

Off Isolation (USB Mode)

3.3

-85

-40

dB

O_IRR

f = 240MHz,

R_T= 20Ω, C_L= 0pF

R_T= 50Ω, C_L= 0pF,

Signal 0dBm,

Figure 15

BW

-3db Bandwidth (USB Mode)

3.3

720

MHz

f = 20Hz to 20kHz,

R_L= 32Ω, V_IN= 2V_PP

Figure 14

THD

Total Harmonic Distortion (Audio Mode)

Signal-to-Noise Ratio (Audio Mode)

3.3

0.11

-90

%

f = 20Hz to 20kHz

R_L= 32Ω, V_IN= 2V_PP

SNR

dB

Note:

8. Guaranteed by characterization, not production tested.

www.fairchildsemi.com

FSA321 • Rev.1.0.6

6

USB High-Speed-Related AC Electrical Characteristics

T_A= - 40°C to +85°C

Min. Typ. Max.

Symbol

t_SK(o)

Parameter

V_CC(V)

Conditions

Unit

t_R= t_F= 750ps

(10-90%) at 240MHz C_L=

0pF, R_L= 50Ω

Channel-to-Channel Skew⁽⁹⁾

(USB Mode)

3.3

35

ps

Figure 11

Skew of Opposite Transitions

of the Same Output⁽⁹⁾

t_R= t_F= 750ps (10-90%) at

240MHz C_L= 0pF, R_L= 50Ω

Figure 10

t_SK(P)

3.3

35

ps

(USB Mode)

Total Jitter⁽⁹⁾

(USB Mode)

R_L= 50Ω, C_L= 50pF, t_R= t_F=

500ps (10-90%) at 480Mbps

(PRBS = 2¹⁵– 1)

t_J

130

Note:

9. Guaranteed by characterization, not production tested.

Capacitance

T_A= - 40°C to +85°C

Symbol

Parameter

V_CC(V)

Conditions

Unit

Min. Typ. Max.

C_IN

Control Pin Input Capacitance

1.8 to 4.3 V_Bias= 0.2V

2.0

pF

V_Bias= 0.2V, f = 240MHz,

1.8 to 4.3

1.8 to 5.5

5.4

6.0

Figure 13

D+/R, D-/L On Capacitance

(USB Mode)

C_{ON(D+/R, D-/L)}

V_Bias= 0.2V, f = 1MHz,

Figure 13

pF

C_{OFF(D+, D-)}

C_OFF(R/L)

USB Path Off Capacitance

Audio Path Off Capacitance

1.8 to 4.3 f = 1MHz, Figure 12

1.6

3.5

pF

www.fairchildsemi.com

FSA321 • Rev.1.0.6

7

Test Diagrams

V_ON

I_(OFF)

A

Dnor R/L

V_SW

D+/R or D-/L

D+, D-

or R/L

GND

I_ON

GND

V_CNTRL= fn (V_CC

)

R

= V_ON/ I_ON

V )

_CNTRL= fn (V_CC

Figure 4. On Resistance

Figure 5. Off Leakage

D+, D- or R,L

R_L

D+/R or D-/L

V_OUT

C_L

D+, D- or R/L

I_A(ON)

A

V

sw

R_S

GND

D+/R or

D-/L

V

V_CNTRL= fn (V_CC

)

sw

GND

R_L, R_S, and C_L, are functions of the application

environment (see tables for specific values).

C_Lincludes test fixture and stray capacitance.

(V

)

V_CNTRL= fn

CC

Figure 6. On Leakage

Figure 7. AC Test Circuit Load

t

_RISE= 750ps

t

_FALL= 750ps

t

_RISE= 1µs

t_FALL= 1µs

V_bus

0.4V

90%

50%

90%

50%

90%

V_th(max)

V_th(min)

Input -V_CNTRL

Input – V_D+/D-

10%

90%

10%

GND

10%

50%

GND

V_OH

Output -V_OUT

V_OL

V_OH

90%

Output- V_OUT

V_OL

50%

t_pLH

t_OFF

t_ON

t_pHL

V_CNTRL= fn (V_CC

)

V_th=V_busthor V_audioth

Figure 8. Turn-On / Turn-Off Waveforms (USB/Audio) Figure 9. USB Switch Propagation Delay Waveforms

www.fairchildsemi.com

FSA321 • Rev.1.0.6

8

Test Diagrams (Continued)

t

t_RISE= 750ps

_FALL= 750ps

0.4V

t_RISE= 750ps

t_FALL= 750ps

90%

50%

90%

50%

Input – V_D+/D

10%

50%

0.4V

GND

90%

50%

90%

50%

Input – V_{D+/D -}

10%

OH

10%

50%

Output1 - V

OUT

GND

50%

t_pLH1

V

OL

OH

t_pHL1

Output- V_OUT

V_OL

50%

t_pLH

t

V

OH

sk(o)

t_pHL

Output2 - V

OUT

50%

t_pLH2t_pHL2

V

OL

Figure 10. Pulse Skew: t_SK(P)= | t_PHL– t_PLH

|

Figure 11. Output Skew: t_SK(O)= | t_PLH1– t_PLH2

or | t_PHL1– t_PHL2

|

Dn or R/L or

D+/R or D -/L

Dn or R/L or D+/R or D-/L

Capacitance

Meter

Capacitance

Meter

f = 240MHz

V_CNTRL= fn (V_CC

)

V_CNTRL= fn (V_CC

)

Dn or R/L or

D+/ R or D-/L

Dn or R/L or

D+/ R or D-/L

f = 1MHz

Figure 12. Channel Off Capacitance

Figure 13. Channel On Capacitance

Audio Analyzer

R_S

V

IN

V_S

GND

V_CNTRL

GND

V_OUT

GND

R_T

V_CNTROL= fn (V_CC

)

GND

R_Sand R_T

are functions of the application

environment (see tables for specific values).

Figure 14. Total Harmonic Distortion

www.fairchildsemi.com

FSA321 • Rev.1.0.6

9

Test Diagrams (Continued)

Network Analyzer

R_S

V

IN

V_S

GND

V_CNTRL

GND

V_OUT

GND

R_T

V_CNTRL= fn (V_CC

)

GND

R_Sand R _Tare functions of the application

environment (see tables for specific values).

Figure 15. USB Bandwidth

Network Analyzer

R_S

V_IN

R_T

V_S

GND

V_CNTRL

GND

V_OUT

GND

V_CNTRL

= fn (

V_CC

)

R_T

GND

Off Isolation = 20 Log (V_OUT/ V_IN

Figure 16. Channel Off Isolation

R_Sand R_Tare functions of the application

environment (see tables for specific values).

)

Network Analyzer

R_S

NC

V

IN

V_S

GND

V_CNTRL

GND

R_T

GND

= fn (V_CC

V_CNTRL

)

V_OUT

GND

R_T

R_Sand R_Tare functions of the application

environment (see tables for specific values

GND

CROSSTALK = 20 Log (V_OUT/ V )

IN

Figure 17. Non-Adjacent Channel-to-Channel Crosstalk

www.fairchildsemi.com

FSA321 • Rev.1.0.6

10

Physical Dimensions

(9X)

0.563

1.70

0.15 C

1.40

A

B

0.663

2X

1

2.10

1.80

PIN#1 IDENT

0.40

0.15 C

0.225

(10X)

TOP VIEW

2X

RECOMMENDED

LAND PATTERN

0.55 MAX.

0.152

0.10 C

9X

0.45

1.45

0.08 C

0.05

0.55

0.40

SEATING

PLANE

C

SIDE VIEW

1.85

0.35

(9X)

0.45

0.225

(10X)

3

OPTIONAL MINIMIAL

TOE LAND PATTERN

0.40

6

DETAIL A

1

NOTES:

PIN#1 IDENT

A. PACKAGE DOES NOT FULLY CONFORM TO

0.15

0.25

10

JEDEC STANDARD.

(10X)

B. DIMENSIONS ARE IN MILLIMETERS.

C. DIMENSIONS AND TOLERANCES PER

ASME Y14.5M, 1994.

0.10 C A B

0.05 C

BOTTOM VIEW

D. LAND PATTERN RECOMMENDATION IS

BASED ON FSC DESIGN ONLY.

E. DRAWING FILENAME: MKT-UMLP10Arev3.

0.55

0.45

0.10

DETAIL A

SCALE : 2X

PACKAGE

EDGE

LEAD

OPTION 2

SCALE : 2X

OPTION 1

SCALE : 2X

Figure 18. 10-Lead, Quad Ultrathin Molded Leadless Package (UMLP)

Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner

without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or

obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions,

specifically the warranty therein, which covers Fairchild products.

Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:

http://www.fairchildsemi.com/packaging/.

www.fairchildsemi.com

FSA321 • Rev.1.0.6

11

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FSA321 • Rev.1.0.6

12

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型号：	FSA321UMX
厂家：	ONSEMI
描述：	多媒体和 USB 2.0 高速和音频开关，带负信号能力，以及无选择音频路径上的内置端接开关输出元件
文件：	总14页 (文件大小：691K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

FSA321UMX [ONSEMI]

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