FSA2000UMX_技术文档

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March 2013

FSA2000

Auto-Selecting HS-USB Switch with Cap-Free Headphone

Audio Amplifier

Description

Features

The FSA2000 is a low-cost integrated HS-USB and audio

switch that incorporates an audio headphone amplifier. This

solution eliminates many of the discrete parts currently used

in stereo headset applications. It provides stereo headphone

drivers designed to operate with a ground-centered output

signal. This allows for the removal of large and expensive

DC blocking capacitors. The headphone drivers are capable

of driving up to 40mW_RMSper channel.

Switch Type

Switch Mechanism

USB Detection

USB + Headphone Amplifier

Auto (USB with V_BUS

)

YES

USB 2.0 High Speed &

Full-Speed Compliant

USB

Audio Amplifier

Amplifier Output Power

Amplifier Gain

THD+N

SNR

PSRR

V_CC

I_{CC (Audio)}

I_CC(USB)

Class AB

40mW_RMS(32Ω)

0dB

0.1%

-90dB

-95dB

Related Resources

. FSA2000 Demonstration Board

. FSA2000 Evaluation Board

. FDB323 — FSA2000 Demonstration Board User Guide

. FEB322 — FSA2000 Evaluation Board User Guide

. AN-8032 — Demonstration Board Quick-Start Guide

2.7 to 4.3V

3mA

6µA

16- Lead UMLP 1.80 x 2.60 x

0.55mm, 0.40mm pitch

Package

. AN-8031 — Utilizing the FSA2000 MUTE Function to

Reduce Audio “Click” and “Pop”

Ordering Information

FSA2000UMX

. For samples, questions, or board requests; please

contact: Analog.Switch@fairchildsemi.com.

Applications

. MP3 Portable Media Players

. Cellular Phones, Smartphones

Typical Application

Auto Switches to USB

when V_BUSpresent

USB Data

Cable

FS / HS USB

D+

D-

USB TX

D+/ R

D-/ L

V+

+

-

0.1µF

OR

V-

R

L

Audio

Subsystem

V+

+

-

32Ω

V-

Headphone

Amplifiers

Eliminates large

220µF capacitors

Figure 1. Mobile Phone Example

www.fairchildsemi.com

FSA2000 • Rev. 1.0.0

Pin Descriptions

Pin #

Name

Type

Description

1

2

3

4

5

D+

D-

R

I/O

USB D+ port from processor or transceiver

USB D- port from processor or transceiver

Right audio channel input

Input

L

Left audio channel input

V_CC

Audio Supply Supply voltage for audio amplifiers, charge pump, and audio control; not required for USB path

Control pin intended to be used temporarily to quiet transients on the audio path upon transition of

/SHDN. Ground if not being used.

6

MUTE

Input

7

/SHDN

GND

D-/L

D+/R

V_BUS

V+

Input

GND

I/O

Shutdown Enable (Requires V_CConly)

8

IC ground

9

Common USB/Audio Port; USB D- data to connector or left audio channel output

Common USB/Audio Port; USB D+ data to connector or right audio channel output

10

11

12

13

14

15

16

I/O

Input/Supply USB input select pin and USB supply

Node

Input

Output

I/O

Node for filtering internal positive amplifier rail; suggest 1µF to GND

V-

Negative amplifier rail input; suggest 1µF to GND. Requires connection to CPO.

Charge pump output used to drive V-, suggest 2.2 µF to GND for filtering.

CPO

CM

Charge pump negative flying capacitor pin; connect to CP via storage capacitor, typically 1µF.

Charge pump positive flying capacitor pin; connect to CM via storage capacitor ,typically 1µF.

CP

I/O

Pin Configuration

CP

16

CM

15

CPO

14

V-

13

Charge Pump

& Voltage

Regulator

12

11

10

9

D+

D-

R

1

2

V+

3MΩ

V_BUS

D+/R

D-/L

V+

+

-

V-

V+

V-

3

4

+

-

L

Audio / Click & Pop Control

5

6

7

8

V_CC

MUTE /SHDN GND

Figure 2. FSA2000UMX (Top View)

www.fairchildsemi.com

FSA2000 • Rev. 1.0.0

2

Functional Diagram

Transient

Suppression

Functional Mode

Power Down

Audio Power Down

Audio Mode

USB Mode

V_BUS

V_CC

LOW

HIGH

X⁽¹⁾

LOW

X⁽¹⁾

HIGH

LOW

X⁽¹⁾

HIGH

LOW

/SHDN

MUTE

Charge Pump

R/L Amplifiers

D+/R, D-/L

OFF

ON

OFF

HI-Z

A

HI-Z

B

D+/R, D-/L=0V

C

R/L

D

D+/D-

E

Figure 3 Label

Notes:

1. The (X) indicates “Don’t Care” state.

A

B

C

D

C

B

E

V_CC

Audio

Control

/SDHN

MUTE

R

L

USB

Control

V_BUS

D+

D-

Audio Mode

USB Mode

D+/R

D-/L

Figure 3. Functional Diagram

.

Audio Power Down –An active-LOW shutdown pin (/SHDN) allows the amplifiers to be placed in low-power

(or shutdown) mode to conserve battery power. While the FSA2000 is in shutdown mode, USB data transfers are

allowed whenever a USB cable is connected to a host (V_BUSis HIGH). The audio amplifiers are enabled and

connected to the common port when /SHDN is HIGH and V_BUSis LOW.

Transient Suppression – The FSA2000 audio amplifier has a soft turn-on feature that suppresses click and pop on

the audio path when the path is selected. In addition to the soft turn-on feature of the amplifier, the MUTE pin mutes

the audio path when asserted HIGH. The mute functionality also has an internal pull-down that disables mute if the

MUTE pin is floated. The MUTE pin allows control of the mute functionality by the application. Please refer to

application note AN-8031, describing the recommended timing and control of MUTE for optimal performance.

www.fairchildsemi.com

FSA2000 • Rev. 1.0.0

3

Functional Description

1µF

2.2µF

1µF

CP

16

CM

15

CPO

14

V-

13

Charge Pump

& Voltage

Regulator

12

11

10

9

D+

1

2

V+

1µF

HS USB TX

V_BUS

D+/R

D-/L

D-

R

V+

+

C_i

-

V-

3

4

Z_IN

Audio

Subsystem

0.1µF

C_i

V+

+

-

V-

L

Z_IN

0.1µF

USB

Port

Audio / Click & Pop Control

2.7 – 4.3V

0.1µF

5

6

7

8

1µF

V_CC

MUTE /SHDN GND

Figure 4. Micro-USB Application

Application Guidelines

performance in the system design. Equation 2 shows the

cut-off frequency of the recommended guidelines.

. Device Placement – Minimize to USB port & USB TX.

. PIN 1, 2, 9, 10 – Minimize and match trace lengths for

USB compliance.

. PIN 5 – Use standard decoupling devices, 0.1µF & 1µF

capacitors; as close to the device as possible.

. PIN 3, 4 – Suggest 0.1µFcapacitor as close to the

device as possible for DC-blocking and setting low-

frequency response of audio amplifier. The input

capacitors combine with the input impedance of the

amplifiers to form a high-pass filter. Equation 1 can be

used to calculate the -3dB cut-off frequency of the high-

pass filter for the given input capacitor value and the

FSA2000 input impedance.

. PIN 8 – Minimize ground trace length between headphone

connector and device; minimize ground path resistance.

. PIN 12 – Suggested 0.1µFcapacitor to GND for filtering; as

close to the device as possible.

. PIN13, 14 – Use low-ESR (equivalent series resistance)

ceramic capacitors for lowest charge pump impedance,

which provides maximum output power of the audio

amplifiers. Recommended to place the components as close

as possible to the device.

1

f_3dB



(1)

(2)

2  Z_INC_i

1

. PIN15, 16 - The charge pump has been optimized for low-

ESR ceramic capacitors for the flying capacitor between CP

and CM, along with the output capacitors on V+, CPO, and

V-. Optimized values for these capacitors are in Figure 4.

17.7Hz 

2(90k)(0.1F)

. It is desirable to be below the 20Hz audio range.

Users have flexibility to adjust capacitor for audio

www.fairchildsemi.com

FSA2000 • Rev. 1.0.0

4

Detailed Description

USB Compliance

over the behavior of the amplifier during startup and power

down. The MUTE pin forces the audio outputs into a known

and controlled state so that any transients of the amplifier

are not propagated to the headphones as clicks and pops.

Figure 6 shows the correct timing of the MUTE pin in relation

to the /SHDN pin for optimal click and pop performance.

Figure 6. Power-Up and Power-Down Timing

Figure 5. High-Speed USB 2.0 Eye Compliance (5.5V)

Table 1.

Parameter

Recommended MUTE Timing

Transient Suppression

Suggested

Timing

Description

A common issue with headphone amplifiers is audible noises

through the headset when the amplifier is powering up or

down. Sharp transients often occur on the audio outputs

during this transition that cause audible “click and pop.” The

FSA2000 prevents these transients during power-up by

muting the outputs until the internal charge pumps are

stable. This ensures that any transients caused by the

charge pump are not propagated to the outputs. In cases

where the application needs a longer startup time for mute,

the FSA2000 has a MUTE pin that allows application control

MUTE setup time to /SHDN

rising edge

TMUTE_{PU_SETUP}

TMUTE_{PU_HOLD}

TMUTE_{PD_SETUP}

TMUTE_{PD_HOLD}

>500ns

MUTE hold time to /SHDN

rising edge

~500ns

>500ns

~500ns

MUTE setup time to /SHDN

falling edge

MUTE hold time to /SHDN

falling edge

www.fairchildsemi.com

FSA2000 • Rev. 1.0.0

5

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

Audio Mode

USB Mode

-0.3

+4.5

+6.0

V_CC

Supply Voltage

V

V_BUS

V_CNTRL

V_SWUSB

V_SWAUDIO

I_SW

Supply Voltage

-0.3

+6.0

V

Control Pin Voltage - /SHDN, MUTE

USB I/O

-0.3

+6.0

V_BUS– 6.0

V_CC– 6.0

V_BUS+ 0.3

V_CC+ 0.3

30

V

Audio I/O

V

Switch I/O Current (Continuous)

mA

C

I_PEAK

T_J

Peak Switch I/O Current (Pulsed, 1ms Duration, <10% Duty Cycle)

Junction Temperature

50

+150

+240

Storage Temperature Range

-65

T_STG

Lead Temperature (Soldering, 10 seconds)

T_L

IEC 61000-4-2 System USB Connector pins (D+/R, D-/L, V_BUS

)

Air Gap

15

4

D+/R, D-/L

All Other Pins

V_BUS

ESD

JEDEC JESD22-A114, Human Body Model

2

kV

1

JEDEC JESD22-C101, Charged Device Model

All Pins

2

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 these ratings or designing to Absolute Maximum Ratings.

Symbol

Parameter

Min.

Typ.

5.0

Max.

Unit

V_BUS

V_CC

USB Supply Voltage

4.0

2.7

0

5.5

4.5

V_CC

V_BUS

V_CC

5

V

Supply Voltage

3.3

V_CNTRL

V_SWUSB

V_SWAUDIO

V_SWING

T_A

Control Voltage - /SHDN, MUTE

D+/L, D-/R, D+, D- Input Range

L,R Audio Input Range

L,R Audio Input Amplitude

Temperature Range

V

0

V

-2.5

V

V_P-P

°C

Ω

-40

16

+25

32

+85

Z_LOAD

_JA

Headset Load Impedance

40

Package Thermal Resistance, JEDEC Standard Multi-Layer Boards, Still Air

C/W

www.fairchildsemi.com

FSA2000 • Rev. 1.0.0

6

DC Electrical Characteristics

T_A= 25°C, V_CC= 3.0V, audio inputs at -6dBV and AC coupled with 0.1µF, audio outputs DC coupled into 32Ω loads

referenced to 1kHz, unless otherwise noted.

T_A= - 40°C to +85°C

Symbol

Parameter

V_CC(V)

Conditions

Unit

Min.

Typ.

Max.

Common Pins

/SHDN, MUTE, Control Input

Voltage HIGH

V_IH

V_IL

2.7 to 4.5

1.65

V

Control Input Voltage LOW

0.5

10

1

V_CNTRL= 3.6V

-1

/SHDN, MUTE, Input HIGH

Current

I_IN

4.5

µA

V_CNTRL= 0V

Common Port (D+/R, D-/L)

V_SW= 0V, 5.5V

I_OFF

Power Off Leakage Current

V_CC= V_BUS= 0

10

D+/R, D-/L = 0.3V,

V_CC– 0.3V, D+, D- = 0.3V,

V_CC– 0.3V or Floating,

/SHDN=0V, V_BUS=0v,

MUTE=0V, R/L=0V

Off-Leakage Current of Port

D+, D-

I_NO(0FF)

3.6

-50

1

50

nA

D+/R, D-/L = 0.3V, V_CC– 0.3V

D+, D- = Floating

V_BUS=5.5V, /SHDN=0V,

MUTE=0V, R/L=0V

On-Leakage Current of Port

D+/R or D-/L

I_NC(0N)

1

50

nA

V_BUS, MUTE, Internal Pull-Down

Resistor

R_PD

3.5

M

USB Switch Path

USB Analog Signal Range

0

3.6

6.5

V

Ω

R_ONUSB

HS Switch On Resistance⁽²⁾

V_BUS=5

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

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

4.0

0.4

(2, 3)

∆ R_ONUSB

HS Delta R_ON

Audio Amplifier Path

4

)

Audio Amp Input Impedance⁽

Z_IN

3.0 to 4.5

90

kΩ

Power Supply

Quiescent Supply Current

(Audio Mode)

I_OUT= 0, /SHDN = V_CC

MUTE=0V, D+/D-=0V

,

I_CC(Audio)

I_CC(/SHDN)

I_CC(USB)

4.5

3

1

6

5

mA

µA

Quiescent Supply Current (V_CC

in Shutdown Mode

)

I_OUT= 0, /SHDN = 0V,

MUTE=0V, D+/D-=0V

Quiescent Supply Current

(USB Mode)

I_OUT=0, MUTE=0V,

/SHDN=V_BUS, L/R=0V

V_BUS=5.5

10

Notes:

2. On resistance is determined by the voltage drop between the D+/D- and D+/R,D-/L pins at the indicated current through

the switch.

3. ∆R_ON= R_{ON_max}– R_{ON_min}measured at identical V_CC, temperature, and voltage.

4. Guaranteed by characterization, but not production tested.

www.fairchildsemi.com

FSA2000 • Rev. 1.0.0

7

AC Electrical Characteristics

T_A= 25°C, V_CC= 3.0V, audio inputs at -6dBV and AC coupled with 0.1µF, audio outputs DC coupled into 32Ω loads

referenced to 1kHz, unless otherwise noted.

T_A= - 40°C to +85°C

Symbol

Parameter

V_CC(V)

Conditions

Unit

Min. Typ. Max.

Audio Amplifier Path

t_ONAUDIO

t_OFFAUDIO

t_{MUTE_ON}

t_{MUTE_OFF}

Turn-On Time /SHDN to Output

Turn-Off Time /SHDN to Output

MUTE Turn-On Time

3.0 to 4.5

2.7

V_{D+/R, D-/L}= 1.0V; C_L= 0pF,

V_{D+/R, D-/L}= 1.0V; C_L= 0pF

1

ms

μs

100

1

MUTE Turn-Off Time

25

35

40

5

THD_N=1%, V_L,RIn Phase,

R_LOAD=32Ω, 1KHz

Output Power⁽⁵

)

P_out

3.3

mW_rms

4.5

V_OS

A_V

Output Offset Voltage

Amplifier Gain

Gain Matching of L & R Channels⁽⁵⁾

Frequency Response⁽⁵⁾

Distortion⁽⁵⁾

Signal to Noise Ratio⁽⁵⁾

Crosstalk between L & R Channel⁽⁵⁾

Inputs Grounded

mV

dB

%

Input = -26dBV at 1kHz, R_L=16Ω

Input = -26dBV, 20Hz to 20kHz

0

A_MATCH

f_R

0.5

20Hz to 20kHz referenced to 1kHz -1.5

f=1KHz, V_sw=50mVrms, R_L=64Ω

A Weighted

1.5

THD+N

SNR

0.1

-90

-60

dB

XTLK_sprk

Input=-26bBV

USB Switch Path

t_PDUSB

USB Switch Propagation Delay⁽⁵⁾

4.0 to 5.5

R_L= 50Ω; C_L= 0pF

0.25

720

-95

ns

V_{D+/R, D-/L}= 1.0V; R_L= 32Ω;

C_L= 0pF, /SHDN,V_CC=0

t_ONUSB

Turn-On Time V_BUSto Output

5.5

2

μs

V_{D+/R, D-/L}= 1.0V; R_L= 32Ω;

C_L= 0pF, /SHDN,V_CC=0

t_OFFUSB

BW

Turn-Off Time V_BUSto Output

4.0 to 5.5

μs

-3db Bandwidth – USB

R_L=50Ω, C_L=0pF, Signal 0dBm

MHz

Power Supply

t_SUPPLY

Power-Up Stabilization Time

V+, V- within 90% of Final Value

1

ms

dB

217Hz 12% Duty Cycle Square

Wave 2.7V to 3.2V at V_CC

Output (D+/R) in V_rmsas Single

Wideband Noise Measurement

within 20Hz – 20kHz, A Weighted

Power Supply Noise Rejection at

Common Output⁽⁵⁾

PSRR_SPKR

Note:

5. Guaranteed by characterization; not production tested.

www.fairchildsemi.com

FSA2000 • Rev. 1.0.0

8

USB High-Speed-Related AC Electrical Characteristics

T_A= 25°C unless otherwise noted.

T_A= - 40°C to +85°C

Min. Typ. Max.

Symbol

Parameter

V_BUS(V)

Conditions

Unit

Skew of Opposite Transitions of the

Same Output⁽⁶⁾

t_R= t_F= 750ps (10-90%) at 240MHz

C_L= 0pF, R_L= 50Ω

t_SK(P)

4.0 to 5.5

35

ps

R_L= 50Ω, C_L= 50pF, t_R= t_F= 500ps

(10-90%) at 480Mbps (PRBS = 2¹⁵– 1)

t_J

Total Jitter⁽⁶⁾

130

Note:

6. Guaranteed by characterization; not production tested.

Capacitance

T_A= 25°C unless otherwise noted.

T_A= - 40°C to +85°C

Min. Typ. Max.

Symbol

Parameter

V_CC/V_BUS(V)

Conditions

Unit

Control Pin Input Capacitance

(/SHDN, MUTE)

C_IN

V_CC= 3.0, 4.5

V_Bias= 0.05V

2.8

pF

C_{ON_USB}

D+, D- (Source Port) On Capacitance

V_BUS=5.0

V_Bias= 0.2V, f = 1MHz, f=240MHz

f = 1MHz

8.8

2.8

pF

C_{OFF_USB}D+, D- (Source Port) Off Capacitance

www.fairchildsemi.com

FSA2000 • Rev. 1.0.0

9

Physical Dimensions

0.10

C

2.100

A

1.80

15X

2X

0.563

B

0.663

1

PIN #1 IDENT

2.900

2.60

0.400

0.10

C

16X

0.225

2X

TOP VIEW

0.55 MAX.

RECOMMENDED LAND PATTERN

0.10

0.08

C

0.152

SEATING

PLANE

C

0.050

C

SIDE VIEW

TERMINAL SHAPE VARIANTS

0.40

0.60

5

0.30

0.50

0.15

0.25

0.15

0.25

0.100

15X

0.100

9

PIN 1

NON-PIN 1

0.40

Supplier 1

1

0.30

0.50

0.15

0.25

0.15

0.25

0.30

0.50

13

16

15X

ALL TERMINALS

PIN 1

NON-PIN 1

0.10

0.05

C

A B

Supplier 2

BOTTOM VIEW

A. THIS PACKAGE IS NOT CURRENTLY REGISTERED WITH

ANY STANDARDS COMMITTEE

B. DIMENSIONS ARE IN MILLIMETERS.

C. DIMENSIONS AND TOLERANCES PER ASME Y14.5M, 1994

D. TERMINAL SHAPE MAY VARY ACCORDING TO PACKAGE

SUPPLIER, SEE TERMINAL SHAPE VARIANTS

E. LAND PATTERN IS A MINIMAL TOE DESIGN

F. DRAWING FILE NAME : UMLP16AREV3

Figure 7. 16-Pin Ultrathin Molded Leadless Package (UMLP)

Order Number

Operating Temperature Range

Package Description

Packing Method

FSA2000UMX

-40 to 85°C

16-Terminal Ultrathin Molded Leadless Package (UMLP)

Tape & Reel

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

FSA2000 • Rev. 1.0.0

10

www.fairchildsemi.com

FSA2000 • Rev. 1.0.0

11

ON Semiconductor and

are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.

ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent

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1


型号：	FSA2000UMX
厂家：	ONSEMI
描述：	自动选择带有无电容耳机音频放大器的HS-USB开关开关放大器音频放大器
文件：	总13页 (文件大小：873K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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