Sony TS 4975 Service Manual

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TS4975

Stereo Headphone Drive Amplifier with

Digital Volume Control via I

2

C Bus

■ Operating from V

■ I²C bus control interface

■ 40mW output power @ V

THD = 1%, F = 1kHz, with 16Ω

■ Ultra-low consumption in stdby mode: 0.6µA

■ Digital volume control range from 18dB to

= 2.5V to 5.5V

CC

CC

=3.3V,

load

-34dB

■ 14-step digital volume control

■ 9 different output mode selections

■ Pop & click noise reduction circuitry

■ Flip-chip package, 12 x 300µm bumps (lead-

free)

Description

The TS4975 is a stereo audio headphone driver
capable of delivering up to 102mW per channel of
continuous average power into a 16Ω single­ended load with 1% THD+N from a 5V power
supply. The overall gain of these headphone
drivers is controlled digitally by volume control
registers programmed via the I
minimizing the number of external components
needed. This device can also easily be driven by
an MCU to select the output modes, through the

2

I

C bus interface.

2

C interface,

TS4975EIJT - Flip Chip

Pin out (top view)

OUT1

OUT1

BYPASS

BYPASS

PHG1

PHG1

IN1

VCC

IN1

VCC

SCL

SCL

PHG2

PHG2

GND

GND

SDA

SDA

OUT2

OUT2

IN2

IN2

ADD

ADD

A phantom ground configuration allows one to
avoid using bulky capacitors on the outputs of the
headphone amplifiers.

The TS4975 is packaged in a 1.8mm X 2.3mm
Flip Chip package, ideally suited for space­conscious portable applications.

Applications

■ Mobile phones (cellular / cordless)

■ PDAs

■ Laptop/notebook computers

■ Portable audio devices

It has also an internal thermal shutdown
protection mechanism.

Order Codes

Part Number Temperature Range Package Packing Marking

TS4975EIJT -40, +85°C Flip-chip Tape & Reel A75

Rev 3

November 2005 1/36

www.st.com

36

Absolute Maximum Ratings TS4975

1 Absolute Maximum Ratings

Table 1. Key parameters and their absolute maximum ratings

Symbol Parameter Value Unit

(2)

(1)

(5)

(3)

6V

GND to V

CC

200 °C/W

Internally Limited

2kV

(4)

V

CC Supply voltage

V

T

oper

T

stg

T

R

thja

P

diss

ESD

Input Voltage

i

Operating Free Air Temperature Range -40 to + 85 °C

Storage Temperature -65 to +150 °C

Maximum Junction Temperature 150 °C

j

Thermal Resistance Junction to Ambient

Power Dissipation

Susceptibility - Human Body Model

ESD Susceptibility - Machine Model (min. Value) 200 V

Latch-up Latch-up Immunity 200 mA

Lead Temperature (soldering, 10sec) 260 °C

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

2. The magnitude of input signal must never exceed VCC + 0.3V / GND - 0.3V

3. Device is protected in case of over temperature by a thermal shutdown active @ 150°C.

4. Exceeding the power derating curves during a long period, may involve abnormal operating condition.

5. Human body model, 100pF discharged through a 1.5kOhm resistor, into pin to VCC device.

Table 2. Operating conditions

Symbol Parameter Value Unit

V

V

CC

R

L

Supply Voltage 2.5 to 5.5v V

Load Resistor >16 Ω

Load Capacitor

= 16 to 100Ω,

R

L

R

> 100Ω,

L

Operating Free Air Temperature Range -40 to +85 °C

Flip Chip Thermal Resistance Junction to Ambient 90 °C/W

T

R

C

L

oper

thja

2/36

400
100

pF

TS4975 Typical Application Schematics

2 Typical Application Schematics

Typical application schematics for the TS4975 are show in
configuration and in

Figure 2

, for a phantom ground output configuration.

Figure 1. Single-ended configuration

Vcc

IN2

IN1

Cin1

33 0nF

Cin2

33 0nF

+

Cb
1µF

A1

Bypass

Bias

IN1
Pre-Amplifier

IN1

A2

IN2
Pre-Amplifier

IN2

D2

Volume control

GND

C2

ADD
SCL
SDA

+

Cs
1µF

B2

Vcc

OUT1 Amplifier

PHG1 Amplifier

Mode

Select

ADD

D1

I2C

SCL

SDA

C1

B1

PHG2 Amplifier

OUT2 Amplifier

Figure 1

OUT1

PHG1

PHG2

OUT2

TS4975

, for a single-ended output

Cout1

+

A3

220µF

1k

B3

C3

Cout2

+

D3

220µF

1k

RL = 16/32 Ohms

+

RL = 16/32 Ohms

+

3/36

Typical Application Schematics TS4975

Figure 2. Phantom ground output configuration

Vcc

IN2

IN1

Cin1

330 nF

Cin2

330 nF

+

A1

Bypass

Cb
1µF

+

Cs
1µF

B2

Vcc

Bias

IN 1
Pre-Amplifier

IN1

A2

OUT1 Amplifier

PHG1 Amplifier

OUT1

PHG1

RL = 16 /32 Ohms

A3

B3

+

Mode

Select

IN 2
Pre-Amplifier

IN2

D2

Volume control

GND

C2

ADD
SCL
SDA

I2C

SCL

SDA

ADD

D1

C1

B1

PHG2 Amplifier

OUT2 Amplifier

TS4975

PHG2

OUT2

C3

RL = 16 /32 Ohms

D3

+

4/36

TS4975 Electrical Characteristics

3 Electrical Characteristics

Table 3. Electrical characteristics for the I²C interface

Symbol Parameter Value Unit

V

IL

V

IH

F

SCL

V

ol

I

i

1. SCL and SDA are CMOS inputs. The nominal input current is about few pA and not 10uA. 10µA refer to the I2C
bus specification.

Maximum Low level Input Voltage on pins SDA, SCL, VADD

Minimum High Level Input Voltage on pins SDA, SCL, VADD

SCL Maximum clock Frequency 400 kHz

Max Low Level Output Voltage, SDA pin, I

Max Input current on SDA, SCL
from 0.1 V

CC

to 0.9 V

CC

(1)

sink

=3mA

0.3 V

CC

0.7 V

CC

0.4 V

10 µA

Table 4. Output noise (all inputs grounded)

Unweighted Filter

from V

= 2.5V to 5V

CC

SE, G = +2dB 34µVrms 23µVrms

SE, G = +18dB 67µVrms 45µVrms

PHG, G = +2dB 34µVrms 23µVrms

PHG, G = +18dB 67µVrms 45µVrms

Weighted Filter (A)

from VCC= 2.5V to 5V

V

V

5/36

Electrical Characteristics TS4975

Table 5. VCC = +2.5 V, GND = 0V, T

= 25°C (unless otherwise specified)

amb

Symbol Parameter Conditions Min. Typ. Max. Unit

I

CC

I

STBY

V

oo

P

out

THD + N

Supply Current

Standby Current

Output Offset Voltage

Output Power
(per channel)

Total Harmonic
Distortion + Noise

No input signal, no load,
Single-ended, Mode 1-4

No input signal, no load,
Single-ended, Mode 5-8

No input signal, no load,
Phantom Ground, Mode 1-4

No input signal, no load,
Phantom Ground, Mode 5-8

SCL and SDA at V

CC

level,

No input signal
No input signal, R

=32Ω,

L

Phantom Ground
Single-ended, THD+N = 1% Max,

F=1kHz, R

=16Ω

L

Single-ended, THD+N = 1% Max,F = 1kHz,
R

=32Ω

L

Phantom Ground, THD+N = 1% Max,
F=1kHz, R

=16Ω

L

Phantom Ground, THD+N = 1% Max,
F=1kHz, R

=32Ω

L

Single-ended, AV= 2dB, RL=32Ω,
P

= 10 mW, 20Hz < F < 20kHz,

out

Single-ended, A
P

= 15 mW, 20Hz < F < 20kHz

out

Phantom Ground, A
P

= 10 mW, 20Hz < F < 20kHz

out

= 2dB, RL=16Ω,

V

= 2dB, RL=32Ω,

V

Phantom GroundAV= 2dB, RL=16Ω,
P

= 15 mW, 20Hz < F < 20kHz

out

15 21

11 13

15 21

11 13

34.2

22.8

4.6 6.5

3.6 5.3

0.6 2 µA

550mV

0.3

0.3

0.3

0.3

Single-ended Output referenced to
Phantom Ground

PSRR

Power Supply
Rejection Ratio

(1)

F = 217Hz, R
V

=200mVpp, Input Grounded,

ripple

C

= 1µF

b

Single-ended Output referenced to

=16Ω, AV= 2dB

L

60

Ground,

F = 217Hz, R
V

=200mVpp, Input Grounded,

ripple

C

= 1µF

b

=16Ω, AV= 2dB

L

60 dB

mA

mW

%

6/36

TS4975 Electrical Characteristics

Table 5. VCC = +2.5 V, GND = 0V, T

= 25°C (unless otherwise specified)

amb

Symbol Parameter Conditions Min. Typ. Max. Unit

=32Ω, AV= 2dB with Single-ended

R

Crosstalk Channel Separation

SNR

ONoise

Signal to Noise Ratio
A-Weighted

Output Noise Voltage,
A-Weighted

L

F=1kHZ, P

R

=32Ω, AV= 2dB with Single-ended

L

F = 20Hz to 20kHz, P

=32Ω, AV= 2dB with Phantom Ground,

R

L

F=1kHZ, P

= 10mW

out

= 10mW

out

out

= 10mW

RL=32Ω, AV= 2dB with Phantom Ground,
F = 20Hz to 20kHz, P

AV= 2dB, RL=32Ω, P

out

out

= 10mW

=12mW

Single-Ended
A

= 2dB, RL=32Ω, P

V

=12mW

out

Phantom Ground
A

= 2dB, Single-ended

V

= 2dB, Phantom Ground

A

V

103

75

69

69

88

88

23

µVrms

23

G Digital Gain Range In1 & In2 to Out1 & Out2 -34 +18 dB

Digital Gain Stepsize 4 dB
Gain Error Tolerance -1 +1 dB

Z

t

t

1. Dynamic measurements - 20*log(rms(V

In1 & In2 Input

in

Impedance

Wake up time

wu

Standby time 1 µs

ws

All gain settings 25.5 30 34.5 kΩ

= 1µF

C

b

)/rms(V

out

ripple

)). V

is an added sinus signal to V

ripple

110 180 ms

@ F = 217Hz

CC

dB

dB

7/36

Electrical Characteristics TS4975

Table 6. VCC = +3.3V, GND = 0V, T

= 25°C (unless otherwise specified)

amb

Symbol Parameter Conditions Min. Typ. Max. Unit

I

CC

I

STBY

V

oo

P

out

THD + N

Supply Current

Standby Current

Output Offset Voltage

Output Power
(per channel)

Total Harmonic
Distortion + Noise

No input signal, no load,
Single-ended, Mode 1-4

No input signal, no load,
Single-ended, Mode 5-8

No input signal, no load,
Phantom Ground, Mode 1-4

No input signal, no load,
Phantom Ground, Mode 5-8

SCL and SDA at V

CC

level,

No input signal
No input signal, R

=32Ω,

L

Phantom Ground
Single-ended, THD+N = 1% Max,

F=1kHz, R

=16Ω

L

Single-ended, THD+N = 1%
Max,F = 1kHz, R

=32Ω

L

Phantom Ground, THD+N = 1% Max,
F=1kHz, R

=16Ω

L

Phantom Ground, THD+N = 1% Max,
F=1kHz, R

Single-ended, A
P

= 20 mW, 20Hz < F < 20kHz,

out

Single-ended, A
P

= 30 mW, 20Hz < F < 20kHz

out

Phantom Ground, A
P

=20 mW, 20Hz < F < 20kHz

out

Phantom GroundA
P

= 30 mW, 20Hz < F < 20kHz

out

=32Ω

L

= 2dB, RL=32Ω,

V

= 2dB, RL=16Ω,

V

=2dB, RL=32Ω,

V

=2dB, RL=16Ω,

V

34 40

24 26

34 40

24 26

34.2

22.8

4.6 6.5

3.6 5.3

0.6 2 µA

550mV

0.3

0.3

0.3

0.3

Single-ended Output referenced to
Phantom Ground

PSRR

Power Supply
Rejection Ratio

(1)

F = 217Hz, R
V

= 200mVpp, Input Grounded,

ripple

C

= 1µF

b

Single-ended Output referenced to

=16Ω, AV=2dB

L

61

Ground,

F = 217Hz, R
V

= 200mVpp, Input Grounded,

ripple

C

= 1µF

b

=16Ω, AV=2dB

L

61

mA

mW

%

dB

8/36

TS4975 Electrical Characteristics

Table 6. VCC = +3.3V, GND = 0V, T

= 25°C (unless otherwise specified)

amb

Symbol Parameter Conditions Min. Typ. Max. Unit

R

=32Ω, AV= 2dB with Single-ended

Crosstalk Channel Separation

SNR Signal To Noise Ratio

ONoise

Output Noise Voltage,
A-Weighted

L

F=1kHZ, P

=32Ω, AV= 2dB with Single-ended

R

L

F = 20Hz to 20kHz, P

=32Ω, AV= 2dB with Phantom Ground,

R

L

F=1kHZ, P

=32Ω, AV= 2dB with Phantom Ground,

R

L

F = 20Hz to 20kHz, P

=2dB, RL=32Ω, P

A

V

=20mW

out

=20mW

out

=20mW

out

=20mW

out

= 25mW

out

Single-Ended
A

=2dB, RL=32Ω, P

V

= 25mW

out

Phantom Ground
A

= 2dB, Single-ended

V

= 2dB, Phantom Ground

A

V

103

75

69

69

90

90

23

23

G Digital Gain Range In1 & In2 to Out1 & Out2 -34 +18 dB

Digital Gain Step size 4 dB
Gain Error Tolerance -1 +1 dB

in

In1 & In2 Input
Impedance

Wake up time

All gain settings 25.5 30 34.5 kΩ

C

=1µF

b

90 156 ms

Standby time 1 µs

)/rms(V

out

ripple

)). V

is an added sinus signal to VCC @ F = 217Hz

ripple

Z

t

wu

t

ws

1. Dynamic measurements - 20*log(rms(V

dB

dB

µVrms

9/36

Electrical Characteristics TS4975

Table 7. VCC = +5V, GND = 0V, T

= 25°C (unless otherwise specified)

amb

Symbol Parameter Conditions Min. Typ. Max. Unit

I

CC

I

STBY

V

oo

P

out

THD + N

Supply Current

Standby Current

Output Offset Voltage

Output Power
(per channel)

Tot al H ar mo n ic
Distortion + Noise

No input signal, no load,
Single-ended, Mode 1-4

No input signal, no load,
Single-ended, Mode 5-8

No input signal, no load,
Phantom Ground, Mode 1-4

No input signal, no load,
Phantom Ground, Mode 5-8

SCL and SDA at V

CC

level,

No input signal
No input signal, R

=32Ω,

L

Phantom Ground
Single-ended, THD+N = 1% Max,

F=1kHz, R

=16Ω

L

Single-ended, THD+N = 1%
Max,F = 1kHz, R

=32Ω

L

Phantom Ground, THD+N = 1% Max,
F=1kHz, R

=16Ω

L

Phantom Ground, THD+N = 1% Max,
F=1kHz, R

Single-ended, A
P

= 50 mW, 20Hz < F < 20kHz,

out

Single-ended, A
P

= 80 mW, 20Hz < F < 20kHz

out

=32Ω

L

= 2dB, RL=32Ω,

V

= 2dB, RL=16Ω,

V

Phantom Ground, AV=2dB, RL=32Ω,
P

=50 mW, 20Hz < F < 20kHz

out

Phantom GroundAV= 2dB, RL=16Ω,
P

= 80 mW, 20Hz < F < 20kHz

out

92 102

59 64

92 98

59 63

34.2

22.8

4.6 6.5

3.6 5.3

0.6 2 µA

550mV

0.3

0.3

0.3

0.3

Single-ended Output referenced to
Phantom Ground

PSRR

Power Supply
Rejection Ratio

(1)

F = 217Hz, R
V

= 200mVpp, Input Grounded,

ripple

C

=1µF

b

Single-ended Output referenced to

=16Ω, AV=2dB

L

63

Ground

F = 217Hz, R
V

= 200mVpp, Input Grounded,

ripple

C

=1µF

b

=16Ω, AV=2dB

L

63

mA

mW

%

dB

10/36

TS4975 Electrical Characteristics

Table 7. VCC = +5V, GND = 0V, T

= 25°C (unless otherwise specified)

amb

Symbol Parameter Conditions Min. Typ. Max. Unit

=32Ω, AV= 2dB with Single-ended

R

Crosstalk Channel Separation

SNR

Signal To Noise
Ratio, A-Weighted

Output Noise

ONoise

Voltage,
A-Weighted

L

F=1kHZ, P

=32Ω, AV= 2dB with Single-ended

R

L

F = 20Hz to 20kHz, P

=50mW

out

=50mW

out

RL=32Ω, AV= 2dB with Phantom Ground,
F=1kHZ, P

=50mW

out

RL=32Ω, AV= 2dB with Phantom Ground,
F = 20Hz to 20kHz, P

=2dB, RL=32Ω, P

A

V

=50mW

out

= 62mW

out

Single-Ended
A

=2dB, RL=32Ω, P

V

= 62mW

out

Phantom Ground
A

= 2dB, Single-ended

V

= 2dB, Phantom Ground

A

V

103

75

69

69

95

95

23

µVrms

23

G Digital Gain Range In1 & In2 to Out1 & Out2 -34 +18 dB

Digital Gain Step size 4 dB
Gain Error Tolerance -1 +1 dB

wu

ws

in

In1 & In2 Input
Impedance

Wake up time

All gain settings 25.5 30 34.5 kΩ

C

=1µF

b

80 144 ms

Standby time 1 µs

ripple

)). V

is an added sinus signal to VCC @ F = 217Hz

ripple

Z

t

t

1. Dynamic measurements - 20*log(rms(Vout)/rms(V

dB

dB

11/36