ST TS4601B User Manual

Features

TS4601B

High performance stereo headphone amplifier

with capacitorless outputs and I

2

C bus interface

■ Power supply range: 2.9 V to 5.5 V

■ 107 dB of PSRR at 217 Hz

■ Fully differential inputs

■ I²C interface for volume control

■ Digital volume control range from -60 dB to

+4 dB

■ 101 dB of SNR A-weighted

■ Independent right and left channel shutdown

control

■ Low quiescent current: 4.8 mA typ. at 3.0 V

■ Low standby current: 2 µA max

■ Output-coupling capacitors removed

■ Flip-chip package 2.1 mm x 2.1 mm, 500 µm

pitch, 16 bumps

Applications

■ Cellular phones

■ Notebook computers

■ CD/MP3 players

TS4601BEIJT - Flip-chip

Pinout (top view)

SDA

SDZ

SDZ

INR-

INR-

INL-

INL-

SDA

INR+

INR+

INL+

INL+

GND

GND

4321

4321

SCL

SCL

CMS

CMS

PVSS

PVSS

C1

C1

VOUTR

VOUTR

VCC

VCC

VOUTL

VOUTL

C2PVCC

C2PVCC

D

D

C

C

B

B

A

A

Balls are underneath

Description

The TS4601B is a stereo headphone driver
dedicated to high audio performance and space­constrained applications. It has the same uses as
the TS4601 which it replaces, while offering highly
improved ESD ratings.

It is based on low power dissipation amplifier core
technology. Special care was taken in the design
of the amplification chain to achieve peerless
PSRR (107 dB typ. at 217 Hz) and 101 dB of
SNR.

The TS4601B can drive 0.9 V
into 16 Ω and 1.6 V

into 10 kΩ, whatever the

rms

output voltage

rms

An I²C interface offers volume control in 64 steps
from -60 dB to +4 dB and multiple configuration
modes for the device.

The traditionally used output-coupling capacitors
can be removed and a dedicated common-mode
sense pin removes parasitic noise from the jack.

The TS4601B is designed to be used with an
output serial resistor. It ensures unconditional
stability over a wide range of capacitive loads.

The TS4601B is packaged in a tiny 16-bump flip­chip with a pitch of 500 µm and a 300 µm
diameter ball size.

power supply voltage, in the 2.9 V to 5.5 V range.

July 2008 Rev 2 1/28

www.st.com

28

Contents TS4601B

Contents

1 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3

2 Typical application schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.1 Electrical characteristics tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.2 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.1 Common-mode sense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.2 I²C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.2.1 I²C bus operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.2.2 Control registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Control register CR0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.3 Wake-up and standby time definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4.4 Decoupling considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4.5 Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.6 Low pass output filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.7 Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

2/28

TS4601B Absolute maximum ratings and operating conditions

1 Absolute maximum ratings and operating conditions

Table 1. Absolute maximum ratings

Symbol Parameter Value Unit

V

CC

Supply voltage

Input voltage

V

in

In Master standby mode, and I²C mode 1, 6
and 7
In I²C mode 2, 3, 4 and 5

T

stg

T

R

thja

P

d

Storage temperature -65 to +150 °C

Maximum junction temperature 150 °C

j

Thermal resistance junction to ambient

Power dissipation Internally limited

HBM - human body model - all pins
VOUTL, VOUTR vs. VCC, GND

MM - machine model (min. value)

ESD

CDM - charge device model 500 V

IEC61000-4-2 level 4, contact
IEC61000-4-2 level 4, air discharge

Latch-up Latch-up immunity 200 mA

Lead temperature (soldering, 10sec) 260 °C

(1)

(6)

(5)

(4)

(6)

(2)

6V

0 to V

CC

V

-2.4 to +2.4

200 °C/W

(3)

2
4

kV

200 V

+/- 8

+/- 15

kV

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

2. The device is protected in case of over temperature by a thermal shutdown active @ 150° C.

3. Exceeding the power derating curves during a long period may provoke abnormal operation.

4. Human body model: A 100 pF capacitor is charged to the specified voltage, then discharged through a

1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations
while the other pins are floating.

5. Machine model: A 200 pF capacitor is charged to the specified voltage, then discharged directly between

two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of
connected pin combinations while the other pins are floating.

6. The measurement is performed on the evaluation board, with an STMicroelectronics ESD protection
EMIF02-AV01F3

Table 2. Operating conditions

Symbol Parameter Value Unit

V

T

R

CC

R

C

oper

thja

Supply voltage 2.9 to 5.5 V

Load resistor ≥ 16 Ω

L

L

Load capacitor

Serial resistor of 12Ω minimum, R

≥ 16Ω,

L

0.8 to 100 nF

Operating free air temperature range -40 to +85 °C

Flip-chip thermal resistance junction to ambient 90 °C/W

3/28

Typical application schematics TS4601B

2 Typical application schematics

Figure 1. Typical application schematics for the TS4601B

Vcc

Cs
1uF

Vcc

Gnd

C1

Positive

Reg

-

+

+

-

Negative

Reg

PVss

B2

Css

2.2uF

VoutL

CMS

VoutR

12 ohms min.

B1

C2

12 ohms min.

D1

Rout

Rout

Gnd

Gnd

Gnd

Cout

0.8nF min.

Cout

0.8nF min.

Headphone / Line Out

Negative Left Input

Gnd

Positive Left Input

Master Standby Command

Positive Right Input

Gnd

Negative Right Input

I2C Bus

Cin

2.2uF

Cin

2.2uF

Cin

2.2uF

Cin

2.2uF

B4

B3

D4

C3

C4

D3

D2

TS4601

InL-

InL+

SDZ

InR+

InR-

SDA

SCL

-

+

+

-

I2C

PVcc Gnd C1 C2

A4 A3 A2 A1

Vcc

Cs
1uF

Gnd GndGnd

Negative

Supply

C12
1uF

Table 3. Pin description for the TS4601B

Pin number Pin name Pin definition

C1 VCC Analog supply voltage, connect to V

A4 PVCC Power supply voltage, connect to V

battery

battery

A2 C1 Capacitor terminal for internal negative supply generator.

A1 C2 Capacitor terminal for internal negative supply generator.

B2 PVSS Capacitor terminal for internal negative supply generator filtering.

D1 VOUTR Right audio channel output signal.

B1 VOUTL Left audio channel output signal.

A3 GND Ground of the device.

C2 CMS

Common-mode sense, to be connected as close as possible to the ground of
headphone / line out plug.

B4 INL- Left audio channel negative input signal.

B3 INL+ Left audio channel positive input signal.

D4 SDZ

Master standby of the circuit. When SDZ = 0, the device is also reset to initial
state. Up to V

tolerant input.

CC

C4 INR- Right audio channel negative input signal.

.

.

4/28

TS4601B Typical application schematics

Table 3. Pin description for the TS4601B (continued)

Pin number Pin name Pin definition

C3 INR+ Right audio channel positive input signal.

D3 SDA I²C signal data. Up to V

D2 SCL I²C clock signal. Up to V

tolerant input.

CC

tolerant input.

CC

Table 4. Component description for the TS4601B

Component Value Description

and PVCC. Two 1µF capacitors are enough for

CC

Cs 1µF

C12 1µF

C

SS

C

in

C

out

R

out

2.2µF

Cin

------------------------=

2πZinFc

0.8nF to 100nF

12Ω min.

Decoupling capacitors for V
proper decoupling of TS4601B. X5R dielectric and 10V rating voltage is
recommended to minimize ΔC/ΔV when V

Must be placed as close as possible to the TS4601B to minimize parasitic
inductance and resistance.

Capacitor for internal negative power supply operation. X5R dielectric and 10V
rating voltage is recommended to minimize ΔC/ΔV when VCC=5V.

Must be placed as close as possible to the TS4601B to minimize parasitic
inductance and resistance.

Filtering capacitor for internal negative power supply. X5R dielectric and 10V
rating voltage is recommended to minimize ΔC/ΔV when V

1

Input coupling capacitor that forms with Zin, a first order high pass filter with a

-3dB cut-off frequency FC. Zin is 12kΩ typical and independent of the gain
setting.

For example F

= 13Hz, Cin = 1µF and for FC = 6Hz, Cin = 2.2µF

C

Output capacitor of 0.8nF minimum to 100nF maximum. This capacitor is
mandatory for operation of the TS4601B.

Output resistor in series with the TS4601B output. This 12Ω minimum resistor
is mandatory for operation of the TS4601B.

CC

=5V.

CC

= 5V.

5/28

Electrical characteristics TS4601B

3 Electrical characteristics

3.1 Electrical characteristics tables

Table 5. Electrical characteristics of the I²C interface

from V

=+2.9 V to VCC=+5.5 V, GND = 0 V, T

CC

= 25° C (unless otherwise specified)

amb

Symbol Parameter Min. Typ. Max. Unit

V

V

V

V

F

SCL

V

OL

I

in

Table 6. Electrical characteristics of the amplifier

Low level input voltage on SDZ pins 0.63 V

IL

High level input voltage on SDZ pins 1.1 V

IH

Low level input voltage on SDA, SCL pins 0.6 V

IL

High level input voltage on SDA, SCL pins 1.3 V

IH

I2C clock frequency 400 kHz

Low level output voltage, SDA pin, I

= 3mA 0.4 V

sink

Input current on SDA, SCL from 0.4V to 4.5V 10 µA

from V

=+2.9 V to VCC=+5.5 V, GND = 0 V, T

CC

= 25° C (unless otherwise specified)

amb

Symbol Parameter Min. Typ. Max. Unit

Quiescent supply current, no input signal, both channels

I

CC

enabled, RL= 16Ω

= 3.0V

V

CC

VCC = 5.0V

4.8

5.6

6
7

Master standby current, No input signal

I

STBY

I

STBY

= 0V

V

SDZ

V

= 0.35V, VCC= 5V

SDZ

0.5 2
10

I²C standby current, no input signal 75 µA

Pull-down resistor on SDZ 480 600 720 kΩ

V

V

oo

Input differential voltage range

in

Output offset voltage

No input signal, RL = 32Ω

(1)

1.2 V

-5 +5 mV

mA

µA

rms

Maximum output voltage, in-phase signals

V

out

Frequency

range

= 16Ω, THD+N = 1% max, f = 1kHz

R

L

= 10kΩ, Rs=15Ω, CL=1nF, THD+N = 1% max, f = 1kHz

R

L

RL = 16Ω, G = 0dB, P

= 20mW, +/- 0.5dB (related to1kHz)

out

Cin = 4.7µF

Total harmonic distortion + noise, G = 0dB

THD + N

R

= 16Ω, Po = 5mW, F = 1kHz

L

= 16Ω, Po = 10mW, 20Hz < F < 20kHz 0.2

R

L

6/28

0.9

V

1.6

10 22000 Hz

0.02 %

rms

TS4601B Electrical characteristics

Table 6. Electrical characteristics of the amplifier

from V

Symbol Parameter Min. Typ. Max. Unit

Power supply rejection ratio

F = 217Hz, R

PSRR

CMRR

Crosstalk

SNR

ONoise

G Gain range with Gain(dB) = 20xlog[(V

Mute InL/R+ - InL/R- = 1V

-

- Step size error -1 +1 stepsize

V
F = 10kHz, R
V

Common mode rejection ratio

= 16Ω, F = 20Hz to 20 kHz, G = 0dB, Vic = 200 mV

R

L

Channel separation

R
RL = 10kΩ, G = 0dB, F = 1kHz, V

Signal to noise ratio, A-weighted, R
THD+N < 1%, F = 1kHz, G=+4 dB

Output noise voltage, A-weighted

G= +4dB
G=-19.5dB -103

Gain step size

from -60dB to -36dB
from -36dB to -16.5dB
from -16.5dB to +4dB

Gain error (G = +4dB) -0.45 +0.42 dB

=+2.9 V to VCC=+5.5 V, GND = 0 V, T

CC

(2)

= 16Ω, G = 0dB

= 200mVpp, grounded inputs

ripple

= 200 mVpp, grounded inputs

ripple

= 16Ω, G = 0dB, F = 1kHz, Po = 40mW

L

L

= 16Ω, G = 0dB

L

rms

= 1.6V

out

=16 Ω, V

L

(3)

(3)

L/R)/(InL/R+ - InL/R-)] -60 +4 dB

out

rms

= 0.9V

out

= 25° C (unless otherwise specified)

amb

100

107

70

65 dB

pp

60
80

rms

82
84

101 dB

-100

-80 dB

3

1.5

0.5

dB

dB

dBV

dB

Left and right channel input impedance all gains setting

Z

in

Single-ended inputs referenced to GND
Differential inputs

Output impedance in Mode 5 (negative supply is ON and
amplifier output stages are OFF)

Z

out

F < 40kHz
F = 6MHz
F = 36MHz

t

wu

t

STBY

1. Guaranteed by design and parameter correlation.

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

3. Guaranteed by design and parameter correlation.

Wake-up time 12 22 ms

Standby time 10 µs

)/rms(V

out

(3)

ripple

10
20

12
24

14.5
29

10

500

75

)). V

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

ripple

7/28

kΩ

kΩ

Ω
Ω

Electrical characteristics TS4601B

3.2 Electrical characteristic curves

Current consumption vs. power supply voltage see Figure 2

Standby current consumption vs. power supply voltage see Figure 3 and Figure 4

Maximum output power vs. power supply voltage see Figure 5

Maximum output power vs. power supply voltage see Figure 6

Maximum output voltage vs. power supply voltage see Figure 7

PSRR vs. frequency see Figure 8 to Figure 12

PSRR vs. gain setting see Figure 13

THD+N vs. output power see Figure 14 to Figure 25

THD+N vs. output voltage see Figure 26

THD+N vs. frequency see Figure 27

THD+N vs. frequency see Figure 28 to Figure 39

CMRR vs. frequency see Figure 40 and Figure 41

Crosstalk vs. frequency see Figure 42 to Figure 45

Common mode response vs. frequency see Figure 46

THD+N vs. input voltage. Line in mode 5 see Figure 47

Input impedance vs. frequency. Line in mode 5 see Figure 48

Gain vs. frequency see Figure 49

Note: When the label “RC network” is present in a curve, it means that a 12 Ω + 1 nF low pass filter

connected on outputs is used (refer to Figure 1: Typical application schematics for the

TS4601B on page 4).

8/28

TS4601B Electrical characteristics

3.0 3.5 4.0 4.5 5.0 5.5

0

25

50

75

100

125

150

175

200

225

250

275

300

THD+N=10% (180°)

THD+N=10% (0°)

THD+N=1% (0°)

RL = 16Ω, F = 1kHz
Left & Right
BW < 30kHz, Tamb = 25°C

THD+N=1% (180°)

Output power (mW)

Vcc (V)

3.0 3.5 4.0 4.5 5.0 5.5

0.0

0.5

1.0

1.5

2.0

2.5

3.0

THD+N=10% (0° & 180°)

RL = RC network + 10kΩ, F = 1kHz
Left & Right
BW < 30kHz, Tamb = 25°C

THD+N=1% (0° & 180°)

Output Voltage (Vrms)

Vcc (V)

Figure 2. Current consumption vs. power

supply voltage

6.0

5.5

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

No load

Current Consumption (mA)

SDZ = Vcc

1.0

SDA = SCL = Vcc

0.5

Ta = 25°C

0.0

3.0 3.5 4.0 4.5 5.0 5.5

Mode 4

Mode 2, 3

Mode 5

Power Supply Voltage (V)

Figure 4. Standby current consumption vs.

standby voltage

1E-3

1E-4

Vcc=5V

Figure 3. Standby current consumption vs.

power supply voltage

1000

800

600

400

200

No load
SDA = SCL = Vcc

Current Consumption SDZ=Gnd (nA)

Ta = 25°C

0

3.0 3.5 4.0 4.5 5.0 5.5

Mode 1, 6, 7, 8

SDZ=Gnd

Power Supply Voltage (V)

100

90

80

70

60

50

40

30

20

10

0

Figure 5. Maximum output power vs. power

supply voltage

Current Consumption SDZ=Vcc ( A)

1E-5

1E-6

Current Consumption (nA)

1E-7

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

Vcc=2.9V

Figure 6. Maximum output power vs. power

supply voltage

175

RL = 32Ω, F = 1kHz
Left & Right

150

BW < 30kHz, Tamb = 25°C

125

100

75

50

Output power (mW)

25

0

3.0 3.5 4.0 4.5 5.0 5.5

THD+N=1% (180°)

THD+N=1% (0°)

SDZ Voltage (V)

THD+N=10% (180°)

THD+N=10% (0°)

Vcc (V)

Vcc=3.6V

No load
SDA = SCL = Vcc
Ta = 25°C

Figure 7. Maximum output voltage vs. power

supply voltage

9/28