TS472_技术文档

TS472

Very Low Noise Microphone Preamplifier

with 2V Biased Output and Active Low Standby Mode

■ Low noise: 10nV/√Hz typ. equivalent input

Flip-chip - 12 bumps

noise @ F = 1kHz

■ Fully differential input/output

■ 2.2V to 5.5V single supply operation

■ Low power consumption @20dB: 1.8mA

■ Fast start up time @ 0dB: 5ms typ.

■ Low distortion: 0.1% typ.

Pin Connections (top view)

■ 40kHz bandwidth @ -3dB and adjustable

■ Active low standby mode function (1µA max)

■ Low noise 2.0V microphone bias output

■ Available in flip-chip lead-free package

■ ESD protection (2kV)

C1

C2

VCC

OUT-

STDBY

OUT+

GND

OUTPUT

BIAS

GS

IN+

BYPASS

IN-

Description

The TS472 is a differential-input microphone

preamplifier optimized for high-performance, PDA

and notebook audio systems.

This device features an adjustable gain from 0dB

to 40dB with excellent power-supply and

common-mode rejection ratios. In addition, the

TS472 has a very low-noise microphone bias

generator of 2V.

Applications

■ Video and photo cameras with sound input

■ Sound acquisition & voice recognition

■ Video conference systems

It also includes a complete shutdown function,

with active low standby mode.

■ Notebook computers and PDAs

Order Codes

Part Number

TS472EIJT

Temperature Range

Package

Packing

Marking

-40, +85°C

Flip-Chip

Tape & Reel

472

Rev 2

1/20

October 2005

www.st.com

20

Typical Application Schematic

TS472

1

Typical Application Schematic

Figure 1 shows a typical application schematic for the TS472 with gain = 20dB. To change the

gain see Chapter 4.5: Gain settings on page 14.

Figure 1. Application schematic

Optional

C1

VCC

Cs

1uF

C2

C3

1uF

Rpos

U1

TS472

Vcc

Rout+

Rout-

Cout+

Cout-

Cin+

Cin-

A1 IN+

B1 IN-

OUT+ C2

Positive Output

Negative Output

+

OUT-

D2

Electret Mic

GAIN

SELECT B2

Rneg

G

BYPASS

A2 BIAS

D1

Bias

2.0V

Cb

1uF

Standby Control

Table 1.

External component descriptions

Functional Description

Components

Input coupling capacitors which blocks the DC voltage at the amplifier input terminal

and determine Lower cut-off frequency.

Cin+, Cin-

Output coupling capacitors which blocks the DC voltage coming from the amplifier

output terminal (pins C2 and D2) and determine Lower cut-off frequency.

Cout+, Cout-

Output load resistors which allow to charged the output coupling capacitors Cout.

Rout+, Rout-

These output resistors can be represented by an input impedance of a following

stage.

Rpos, Rneg

Microphone biasing resistors

Cs

Cb

Supply Bypass capacitor which provides power supply filtering.

Bypass pin capacitor which provides half supply filtering.

Low pass filter capacitors which can determine Higher cut-off frequency.

Bias output capacitor which keeps voltage stabilized and provides 2.0V bias filtering.

C1, C2

C3

2/20

TS472

Absolute Maximum Ratings

2

Absolute Maximum Ratings

Table 2.

Symbol

Key parameters and their absolute maximum ratings

Parameter

Value

Unit

(1)

V

6

V

CC

Supply voltage

Input Voltage

V

GND-0.3 to V +0.3

V

i

CC

T

Operating Free Air Temperature Range

Storage Temperature

-40 to + 85

-65 to +150

150

°C

oper

T

stg

T

Maximum Junction Temperature

j

R

Flip-chip Thermal Resistance Junction to Ambient

Human Body Model

180

2

°C/W

kV

thja

ESD

Machine Model

200

250

V

Lead Temperature (soldering, 10sec)

°C

1. All voltages values are measured with respect to the ground pin.

Table 3.

Symbol

Operating conditions

Parameter

Value

Unit

V

Supply Voltage

2.2 to 5.5

V

CC

Typical Differential Gain (GS connected to 4.7kΩ or

Bias)

G

20

dB

V

Standby Voltage Input:

1.5 ≤ V

≤ V

CC

V

STB

Device ON

STB

GND ≤ V

≤ 0.4

Device OFF

STB

T

Operational Free Air Temperature Range

-40 to +85

150

°C

OP

R

Flip-chip Thermal Resistance Junction to Ambient

°C/W

thja

3/20

Electrical Characteristics

TS472

3

Electrical Characteristics

Table 4.

Symbol

V

= 3V, GND = 0V, T

= 25°C (unless otherwise specified)

CC

amb

Parameter

Equivalent Input Noise Voltage Density

=100Ω at 1KHz

Min.

Typ.

Max.

Unit

nV

-----------

e

10

n

R

Hz

EQ

Total Harmonic Distortion + Noise

20Hz ≤ F≤ 20kHz, Gain=20dB, Vin=50mV

THD+N

0.1

10

%

RMS

V

mV

RMS

Input Voltage, Gain=20dB

70

IN

Bandwidth @ -3dB

Bandwidth @ -1dB

pin A3, B3 floating

40

20

B

kHz

W

Overall Output Voltage Gain (Rgs variable)

Minimum Gain, Rgs infinite

Maximum Gain, Rgs=0

G

-3

39.5

-1.5

41

0

42.5

dB

Z

Input impedance referred to GND

Resistive load

80

10

100

120

kΩ

pF

IN

R

LOAD

C

Capacitive load

100

2.4

1

LOAD

I

Supply current, Gain=20dB

Standby current

1.8

mA

µA

CC

I

STANDBY

Power Supply Rejection Ratio, Gain=20dB, F=217Hz,

Vripple=200mVpp, Inputs grounded

Differential Output

PSRR

dB

-70

-46

Single-Ended Outputs,

Table 5.

Symbol

Bias output: V

= 3V, GND = 0V, T

= 25°C (unless otherwise specified)

amb

CC

Parameter

Min.

1.9

80

Typ.

2

Max.

2.1

Unit

V

No load condition

Output resistance

OUT

R

100

2

120

Ω

OUT

I

Output Bias Current

mA

OUT

Power Supply Rejection Ratio, F=217Hz,

Vripple=200mVpp

PSRR

70

80

dB

4/20

TS472

Electrical Characteristics

Table 6.

Gain

Differential RMS noise voltage

Input Referred Noise Voltage

Output Noise Voltage

(µV

)

(µV

)

RMS

(dB)

Unweighted Filter

A-weighted Filter Unweighted Filter A-weighted Filter

0

15

3.4

1.4

10

2.3

0.9

15

34

10

23

91

20

40

141

Table 7.

Bias output RMS noise voltage

Unweighted Filter

(µV

A-weighted Filter

Cout

(µF)

)

(µV

)

RMS

1

5

4.4

1.2

10

2.2

Table 8.

Gain

SNR (signal to noise ratio), THD+N < 0.5%

Unweighted Filter

(dB)

A-weighted Filter

(dB)

Vcc=2.2V

Vcc=3V

Vcc=5.5V

Vcc=2.2V

Vcc=3V

Vcc=5.5V

0

75

82

70

76

83

72

76

83

74

79

89

80

90

82

80

90

84

20

40

Note:

Unweighted filter = 20Hz ≤ F ≤ 20kHz

5/20

Electrical Characteristics

TS472

Table 9.

Index of graphics

Description

Figure

Page

Current consumption vs. power supply voltage

Standby threshold voltage vs. power supply voltage

Frequency response

Figure 2 to 3

Figure 4

page 7

page 8

page 9

page 10

page 11

Figure 5

Bias output voltage vs. bias output current

Bias output voltage vs. power supply voltage

Bias PSRR vs. frequency

Figure 6

Figure 7

Figure 8 to 9

Figure 10 to 11

Figure 12 to 13

Figure 14

Differential output PSRR vs. frequency

Single-ended output PSRR vs. frequency

Equivalent input noise voltage density

D gain vs. power supply voltage

Dgain vs. ambient temperature

Figure 15

Figure 16

Figure 17

Maximum input voltage vs. gain, THD+N<1%

THD+N vs. input voltage

Figure 18 to 19

Figure 20 to 25

Figure 26 to 27

Figure 28 to 29

THD+N vs. frequency

Transient response

6/20

TS472

Electrical Characteristics

Figure 2. Current consumption vs. power

supply voltage

Figure 3. Current consumption vs. power

supply voltage

3.0

No Loads, Maximum Gain

No Loads, Minimum Gain

2.5

2.0

1.5

1.0

2.5

2.0

1.5

1.0

T_AMB=25°C

T_AMB=85°C

T_AMB=-40°C

T_AMB=85°C

T_AMB=-40°C

T_AMB=25°C

0.5

0.0

0.5

0.0

2.2

3

4

Power Supply Voltage (V)

5

3

4

Power Supply Voltage (V)

5

5.5

2.2

Figure 4. Standby threshold voltage vs.

power supply voltage

Figure 5. Frequency response

30

1.0

0.8

0.6

0.4

Cb=1µF, T_AMB=25°C, Gain=20dB, Rout=100kΩ

20

10

0

no C1,C2

C1,C2=100pF

Cin,Cout=100nF

C1,C2=220pF

0.2

-10

-20

Cin,Cout=10nF

No Loads

Tamb = 25°C

0.0

2.2

3

4

5

5.5

10

100

1000

10000

100000

Power Supply Voltage (V)

Frequency (Hz)

Figure 6. Bias output voltage vs. bias output Figure 7. Bias output voltage vs. power

current supply voltage

2.2

2.0

1.8

1.6

1.4

2.2

2.0

1.8

1.6

1.4

Tamb=25°C

Ibias=0mA

Ibias=2mA

Ibias=4mA

Tamb=85°C

Tamb=-40°C

Tamb=25°C

5.5

0

1

2

3

4

3

4

5

2.2

Bias Output Current (mA)

Power Supply Voltage (V)

7/20

Electrical Characteristics

TS472

Figure 8. Bias PSRR vs. frequency

Figure 9. Bias PSRR vs. frequency

0

Vripple=200mVpp

Vcc=5V

-20

Cb=1µF

Vcc=3V

-20

Cb=1µF

Tamb=25°C

Tamb =25

°C

-40

-60

Bias=1kΩ to GND

-40

-60

Bias floating or 1k

Ω

to GND

-80

Bias floating

-100

50

20k

100

1k

Frequency (Hz)

10k

50

20k

100

1k

Frequency (Hz)

10k

Figure 10. Differential output PSRR vs.

frequency

Figure 11. Differential output PSRR vs.

frequency

0

V_RIPPLE=200mV_PP, Inputs grounded

V_CC=5V, Cb=Cin=1µF, T_AMB=25°C

V_CC=3V, Cb=Cin=1µF, T_AMB=25°C

-20

-40

-20

-40

Maximum Gain

Minimum Gain

Maximum Gain

Gain=20dB

-60

Minimum Gain

Gain=20dB

-80

-100

100

1k

Frequency (Hz)

10k

100

1k

Frequency (Hz)

10k

50

20k

50

20k

Figure 12. Differential output PSRR vs.

frequency

Figure 13. Differential output PSRR vs.

frequency

0

V_RIPPLE=200mV_PP, Inputs grounded

V_CC=3V, Minimum Gain, Cin=1µF, T_AMB=25°C

V_CC=3V, Gain=20dB, Cin=1µF, T_AMB=25°C

-20

-40

Cb=1µF

No Cb

-60

Cb=100nF

No Cb

-60

-80

Cb=100nF

-100

50

100

1k

10k

100

1k

10k

50

20k

Frequency (Hz)

8/20

TS472

Electrical Characteristics

Figure 14. Single-ended output PSRR vs.

frequency

Figure 15. Equivalent input noise voltage

density

0

1000

Vripple=200mVpp

Cin=100nF

-10 Inputs grounded

R_EQ=100

Ω

Cb=1

Cin=100nF

Tamb=25

µF

Vcc=3V

T_AMB=25

°

C

-20

-30

-40

-50

-60

-70

-80

°

C

100

10

1

Vcc=2.2V

100

Vcc=5V

10000

10

100

1k

10k

100k

50

20k

1000

Frequency (Hz)

Figure 16. ∆ gain vs. power supply voltage

Figure 17. ∆gain vs. ambient temperature

1.0

0.50

F=1kHz

Vin=5mV

Tamb=25°C

V_IN=5mV

0.8

0.6

0.25

Maximum Gain

0.00

0.4

-0.25

Maximum Gain

0.2

-0.50

Gain=20dB

0.0

Minimum Gain

Gain=20dB

-0.75

-0.2

-0.4

Minimum Gain

-1.00

5.5

3

4

5

-40

-20

0

20

40

60

80

2.2

Power Supply Voltage (V)

Ambient Temperature (°C)

Figure 18. Maximum input voltage vs. gain,

THD+N<1%

Figure 19. Maximum input voltage vs. power

supply voltage, THD+N<1%

150

T_AMB=25°C, F=1kHz, THD+N<1%

140

120

100

80

Gain=0dB

T_AMB=25°C

V_CC=5.5V

F=1kHz

THD+N<1%

100

60

Gain=30dB

Gain=20dB

50

Gain=40dB

40

V_CC=3V

20

V_CC=2.2V

0

3

4

5

5.5

2.2

0

10

20

30

40

Power Supply Voltage (V)

Gain (dB)

9/20

Electrical Characteristics

TS472

Figure 20. THD+N vs. input voltage

Figure 21. THD+N vs. input voltage

10

Minimum Gain

Gain=20dB

1

Gain=20dB

1

0.1

Maximum Gain

Tamb=25°C, Vcc=3V, F=100Hz,

Tamb=25°C, Vcc=5V, F=100Hz,

0.01

1E-3

0.01

1E-3

Cb=1

µ

F, RL=10k

Ω

, BW=100Hz-120kHz

Cb=1

µ

F, RL=10k

Ω

, BW=100Hz-120kHz

0.3

0.01

0.1

0.01

0.1

Input Voltage

(

V_RMS

)

Input Voltage (V_RMS)

Figure 22. THD+N vs. input voltage

Figure 23. THD+N vs. input voltage

10

Minimum Gain

Gain=20dB

1

0.1

Maximum Gain

Tamb=25°C, Vcc=5V, F=1kHz,

Cb=1 F, RL=10k , BW=100Hz-120kHz

Tamb=25°C, Vcc=3V, F=1kHz,

Cb=1 F, RL=10k , BW=100Hz-120kHz

0.01

1E-3

0.01

µ

Ω

µ

Ω

0.3

0.01

Input Voltage

0.1

1E-3 0.01

Input Voltage

0.1

(

V_RMS)

(

V_RMS)

Figure 24. THD+N vs. input voltage

Figure 25. THD+N vs. input voltage

10

Minimum Gain

Maximum Gain

1

Gain=20dB

0.1

T_AMB=25°C, V_CC=3V, F=20kHz,

0.01

Tamb=25°C, Vcc=5V, F=20kHz,

0.01

Cb=1

µ

F, RL=10k

Ω

, BW=100Hz-120kHz

0.01

Cb=1

µ

F, RL=10k

Ω

, BW=100Hz-120kHz

0.01

0.3

1E-3

0.1

1E-3

0.1

Input Voltage (V_RMS)

10/20

TS472

Electrical Characteristics

Figure 27. THD+N vs. frequency

Figure 26. THD+N vs. frequency

10

Tamb=25°C, Vcc=3V, RL=10k

Cb=1 F, BW=100Hz-120kHz

Ω

Tamb=25

°C, Vcc=5V, RL=10kΩ

µ

Cb=1 F, BW=100Hz-120kHz

µ

Maximum Gain, Vin=15mV_RMS

Minimum Gain, Vin=100mV_RMS

1

0.1

1

Minimum Gain, Vin=100mV_RMS

Gain=20dB, Vin=50mV_RMS

0.1

0.01

50

100

1000

10000 20k

50

100

1000

10000 20k

Frequency (Hz)

Figure 28. Transient response

Figure 29. Transient response

11/20

Application Information

TS472

4

Application Information

4.1

Differential configuration principle

The TS472 is a full-differential input/output microphone preamplifier. The TS472 also includes a

common mode feedback loop that controls the output bias value to average it at Vcc/2. This

allows the device to always have a maximum output voltage swing, and by consequence,

maximize the input dynamic voltage range.

The advantages of a full-differential amplifier are:

●

Very high PSRR (Power Supply Rejection Ratio).

High common mode noise rejection.

In theory, the filtering of the internal bias by an external bypass capacitor is not necessary.

But, to reach maximum performances in all tolerance situations, it’s better to keep this

option.

4.2

Higher cut-off frequency

The higher cut-off frequency F of the microphone preamplifier depends on an external

CH

capacitors C , C .

1

2

TS472 has an internal first order low pass filter (R=40kΩ, C=100pF) to limit the highest cut-off

frequency on 40kHz (with a 3dB attenuation). By connecting C , C you can decrease F with

1

2

CH

regard to following formula:

1

F_CH= ---------------------------------------------------------------------------------

2π 40×10³(C_{1, 2}+ 100×10^–12

)

Figure 24, which follows, directly shows the higher cut-off frequency in Hz versus the value of

the output capacitors C , C in nF:

1

2

Figure 30. Higher cut-off frequency vs. output capacitors

40

10

1

200

400

600

800

1000

C1, C2 (pF)

For example, F is almost 20kHz with C =100pF.

CH

1,2

12/20

TS472

Application Information

4.3

Lower cut-off frequency

The lower cut-off frequency F of the microphone preamplifier depends on the input

CL

capacitors C and output capacitors C . These input and output capacitors are mandatory in

in

out

a application because of DC voltage blocking.

The input capacitors C in serial with the input impedance of the TS472 (100kΩ) are equivalent

in

to a first order high pass filter. Assuming that F is the lowest frequency to be amplified (with a

CL

3dB attenuation), the minimum value of C is:

in

1

C_in= ----------------------------------------------

2π F_CL100×10³

The capacitors C in serial with the output resistors R (or an input impedance of the next

out

stage) are also equivalent to a first order high pass filter. Assuming that F is the lowest

CL

frequency to be amplified (with a 3dB attenuation), the minimum value of C is:

out

1

C

_out= -------------------------------------

2π F_CLR_out

Figure 31. Lower cut-off frequency vs.

input capacitors

Figure 32. Lower cut-off frequency vs.

output capacitors

1000

Rout=10k

Ω

ZinMAX

Typical Zin

100

ZinMIN

Rout=100k

Ω

10

1

10

Cin (nF)

100

1

10

100

1000

Cout (nF)

Figure 30 and Figure 32 give directly the lower cut-off frequency (with 3dB attenuation) versus

the value of the input or output capacitors

Note:

In case F is kept the same for calculation, It must be taken in account that the 1st order high-

CL

pass filter on the input and the 1st order high-pass filter on the output create a 2nd order high-

pass filter in the audio signal path with an attenuation of 6dB on F and a rolloff of

CL

40db⁄ decade.

4.4

Low-noise microphone bias source

The TS472 provides a very low noise voltage and power supply rejection BIAS source designed

for biasing an electret condenser microphone cartridges. The BIAS output is typically set at

2.0 V (no load conditions), and can typically source 2mA with respect to drop-out,

DC

determined by the internal resistance 100Ω (for detailed load regulation curves see Figure 6).

13/20

Application Information

TS472

4.5

Gain settings

The gain in the application depends mainly on:

●

the sensitivity of the microphone,

the distance to the microphone,

the audio level of the sound,

the desired output level.

The sensitivity of the microphone is generally expressed in dB/Pa, referenced to 1V/Pa. For

example, the microphone used in testing had an output voltage of 6.3 mV for a sound pressure

of 1 Pa (where Pa is the pressure unit, Pascal). Expressed in dB, the sensitivity is:

20Log(0.0063) = -44 dB/Pa

To facilitate the first approach, the following table gives voltages and gains used with a low cost

omnidirectional Electret Condenser Microphone of -44dB/Pa.

Table 10. Typical TS472 gain vs. distance to the microphone (sensitivity -44dB/Pa)

Distance to microphone

Microphone output voltage

TS472 Gain

30 mV

1 cm

20

RMS

3 mV

20 cm

100

RMS

The gain of the TS472 microphone preamplifier can be set:

1. From -1.5 dB to 41 dB by connecting an external grounded resistor R to the GS pin. It

GS

allows to adapt more precisely the gain to each application.

Table 11. Selected gain vs. gain select resistor

Gain (dB)

0

10

20

30

1k

40

68

R

(Ω)

470k

27k

4k7

GS

Figure 33. Gain in dB vs. gain select

resistor

Figure 34. Gain in V/V vs. gain select

resistor

50

Tamb=25°C

100

40

30

20

10

0

10

1

-10

10

100

1k

10k

R_GS(Ω)

100k

1M

10

100

1k

10k

R_GS(Ω)

100k

1M

14/20

TS472

Application Information

2. To 20dB by applying V > 1V on Gain Select (GS) pin. This setting can help to reduce

GS

DC

a number of external components in an application, because 2.0 V is provided by

DC

TS472 itself on BIAS pin.

Following Figure 26 gives other values of the gain vs. voltage applied on GS pin

Figure 35. Gain vs. gain select voltage

Tamb=25°C

40

20

0

-20

-40

-60

-80

0

0.2

0.4

0.6

0.8

4

5

V_GS(V)

4.6

Wake-up time

When the standby is released to put the device ON, a signal appears on the output a few

microseconds later, and the bypass capacitor Cb is charged in a few milliseconds. As Cb is

directly linked to the bias of the amplifier, the bias will not work properly until the Cb voltage is

correct.

In the typical application, when a biased microphone is connected to the differential input via

the input capacitors (Cin), (and the output signal is in line with the specification), the wake-up

time will depend upon the values of the input capacitors Cin and the gain. When gain is lower

than 0dB, the wake-up time is determined only by the bypass capacitor Cb, as described

above. For a gain>0dB, see Figure 36

Figure 36. Wake-up time in the typical application vs. input capacitors

60

Tamb = 25°C

Vcc=3V

Cb=1µF

50

40

30

20

10

0

Maximum Gain

Gain=20dB

20

40

60

80

100

Input capacitors C_IN(nF)

15/20

Application Information

TS472

4.7

Standby mode

When the standby command is set, the time required to set the output stages (differential

outputs and 2.0V bias output) in high impedance and the internal circuitry in shutdown mode is

a few microseconds.

4.8

Layout considerations

The TS472 has sensitive pins to connect C1, C2 and Rgs. To obtain high power supply

rejection and low noise performance, it is mandatory that the layout track to these component is

as short as possible.

Decoupling capacitors on Vcc and bypass pin are needed to eliminate power supply drops. In

addition, the capacitor location for the dedicated pin should be as close to the device as

possible.

4.9

Demoboard

A demoboard for the TS472 is available.

For more information about this demoboard, please refer to Application Note AN2240, which

can be found on www.st.com.

Figure 37. Top layer

Figure 38. Bottom layer

Figure 39. Component location

16/20

TS472

Application Information

Figure 40. Demoboard schematic

Jumper J4

P10

Vx

P11 Vbias

P5

VCC

C1

C9

1

2

1

2

1

2

1

2

P2

100pF

100nF

Vcc

R9

100k

R10

R6

4

POS. OUTPUT

NEG. OUTPUT

C7

1uF

C6

100nF

3

2

1

Bias

C2

2

C8

2

OUTPUT

C10

1uF

100pF

100nF

R8

100k

TS472_FC_Adapter

C4

Vcc

1

2

P1

100nF

4

3

2

1

6

8

IN+

IN-

OUT+ 13

POS. INPUT

NEG. INPUT

Jumper J2

OUT-

12

C5

2

INPUT

GAIN

100nF

5

P8

SELECT

BYPASS

Gain

Bias

20dB

Min

Max

Rgs

1

2

4

6

8

3

5

7

BIAS

R7

Bias 4

10

Gain Select

C3

1uF

R1

1

2

C11

R11

470k

R2

1

P9

27k

0dB

1

3

5

7

9

2

4

6

8

10

10dB

20dB

30dB

40dB

R3

1

P6

VCC

4.7k

Jumper J1

1

2

3

R4

1

Rgs

1k

StandBy

R5

1

68

Jumper J3

17/20

Package Mechanical Data

TS472

5

Package Mechanical Data

Figure 41. TS472 footprint recommendation

75µmmin.

100µm max.

500µm

Φ=250µm

Track

Φ=400µm typ.

Φ=340µm min.

150µm min.

Non Solder mask opening

Pad in Cu 18µmwith Flash NiAu (2-6µm, 0. 2µm max. )

Figure 42. Pin-out (top view)

C1

C2

GS

IN-

VCC

OUT-

STDBY

OUT+

GND

3

2

1

OUTPUT

BIAS

IN+

BYPASS

B

D

C

A

n

Balls are underneath

Figure 43. Marking (top view)

■

ST Logo

E

Part number: 472

E Lead free Bumps

Three digits Datecode: YWW

The dot is for marking pin A1

4 7 2

Y W

W

18/20

TS472

Package Mechanical Data

Figure 44. Flip-chip - 12 bumps

2.1 mm

■

Die size: 2.1mm x 1.6mm 30µm

Die height (including bumps): 600µm

Bumps diameter: 315µm 50µm

Bump Diameter Before Reflow: 300µm 10µm

Bumps Height: 250µm 40µm

Die Height: 350µm 20µm

1.6 mm

0.5mm

0.315mm

Pitch: 500µm 50µm

Coplanarity: 50µm max

Figure 45. Tape & reel specification (top view)

1.5

4

1

A

8

Die size X + 70µm

4

All dimensions are in mm

User direction of feed

19/20

Revision History

TS472

6

Revision History

Date

Revision

Changes

July 2005

Oct. 2005

1

2

First Release corresponding to the product preview version.

First release of fully mature product datasheet.

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences

of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is

granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are

subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products

are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

The ST logo is a registered trademark of STMicroelectronics.

All other names are the property of their respective owners

STMicroelectronics group of companies

Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -

Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America

www.st.com

20/20


型号：	TS472
厂家：	ST
描述：	Very Low Noise Microphone Preamplifier with 2V Biased Output and Active Low Standby Mode 超低噪声麦克风前置放大器， 2V偏置输出和低电平有效待机模式放大器
文件：	总20页 (文件大小：613K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

TS472 [STMICROELECTRONICS]

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