ST TS4604 User Manual

Stereo headset driver and analog audio line driver with

Features

■ Operating from V

supply operation

■ Line driver stereo differential inputs

■ External gain setting resistors

■ Space-saving package: TSSOP28 pitch

0.65 mm

■ Dedicated shutdown control per function

■ 100 mW headset drive into a 16 Ω load

■ 90 dB high PSRR on headset drive

■ Two internal negative supplies to ensure

ground-referenced, headset and line driver
capless outputs

■ Internal undervoltage mute

■ Line driver 2 Vrms typ. Output voltage across

entire supply voltage range

■ Pop-&-click reduction circuitry, thermal

shutdown and output short-circuit protection

Applications

■ PDP/LCD TV

■ Set-top boxes

Description

= 3 V up to 4.8 V single

CC

TS4604

integrated reference to ground

TSSOP28

Pin connections (top view)

+LDL

-LDL

OUTLDL

AGND

ENLD

PVSSLD

CNLD

CNHP

PVSSHP

ENHP

AGND

OUTHPL

-HPL

+HPL

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

+LDR

-LDR

OUTLDR

EUVP

PGND

PVCCLD

CPLD

CPHP

PVCCHP

PGND

NC

OUTHPR

-HPR

+HPR

The TS4604 is a stereo ground-referenced output
analog line driver and stereo headset driver
whose design allows the output DC-blocking
capacitors to be removed, thus reducing
component count. The TS4604 drives 2 Vrms into
a 5 kΩ load or more. The device has differential
inputs and uses external gain setting resistors.

The TS4604 delivers up to 100 mW per channel
into a 16 Ω load. All outputs of the TS4604 include
±8 kV human body model ESD protection cells.

October 2010 Doc ID 17913 Rev 1 1/31

www.st.com

31

Contents TS4604

Contents

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

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

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

4 Characteristics of the line driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5 Characteristics of the headset driver . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.1 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.2 Use of ceramic capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

6.3 Flying and tank capacitor for the internal negative supply . . . . . . . . . . . . 18

6.4 Power supply decoupling capacitor (Cs) . . . . . . . . . . . . . . . . . . . . . . . . . 18

6.5 Input coupling capacitor (Cin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6.6 Range of the gain setting resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6.7 Performance of CMRR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.8 Internal and external undervoltage detection . . . . . . . . . . . . . . . . . . . . . . 21

6.8.1 Internal UVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.8.2 External UVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.9 2nd order Butterworth low-pass filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6.10 ESD protection and compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6.11 Pop-&-click circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.12 Start-up phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.13 Layout recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

7.1 TSSOP28 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

8 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2/31 Doc ID 17913 Rev 1

TS4604 Absolute maximum ratings and operating conditions

1 Absolute maximum ratings and operating conditions

Table 1. Absolute maximum ratings (AMR)

Symbol Parameter Value Unit

V

CC

V

in

V

in

T

oper

T

stg

T

R

thja

P

ESD

Supply voltage

Input voltage enable & standby pin

Input signal voltage -2.5 to +2.5 V

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 Internally limited

d

Human body model for all pins except outputs
Human body model for all output pins

Machine model 200 V

(1)

(2)

(3)

5.5 V

GND to V

CC

200 °C/W

(4)

2
8

V

kV

Charge device model 1500 V

Latch-up Latch-up immunity 200 mA

Lead temperature (soldering, 10sec) 260 °C

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

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

3. The device is protected from overheating by a thermal shutdown mechanism active at 150° C.

4. Exceeding the power derating curves during a long period provokes abnormal operating conditions.

Table 2. Operating conditions

Symbol Parameter Value Unit

V

Supply voltage 3 to 4.8 V

CC

Vicm Common-mode input voltage range From -1.4 to 1.4 V

R

R

R

1. With heatsink surface = 125 mm2.

Line drive load resistor ≥ 5kΩ

LD

Headset drive load resistor ≥ 16 Ω

HD

Thermal resistance junction-to-ambient

thja

(1)

80 °C/W

Doc ID 17913 Rev 1 3/31

Typical application TS4604

2 Typical application

Figure 1. Simplified application schematics in differential configuration setting

R2

2.2 µF

2.2 µF

2.2 µF

2.2 µF

2.2 µF

2.2 µF

2.2 µF

2.2 µF

R1

R1

R1

R1

R1

R1

R1

R1

R2

R2

R2

-LDR

+LDR

R2

-LDL

+LDL

R2

-HPR

+HPR

R2

-HPL

+HPL

R2

OUTLDR

>5 KΩ

OUTLDL

>5 KΩ

TS4604

OUTHPR

16/32 Ω

OUTHPL

16/32 Ω

Thermal shutdown

UVLO

Negative

charged pump

headset

CPHP

1 µF

CNHP

management

Negative

charged pump

line driver

CPLD

1 µF

3 to 4.8 V

PGND

R1= 10 kΩ, R2 = Av x R1
with R2 ≤ 100 k

AGND

AGND

PVCCHP

1 µF

1 µF

PVSSHP

4/31 Doc ID 17913 Rev 1

Powe r

CNLD

PVCCLD

PVSSLD

EUVP

ENHP

ENLD

1 µF

1 µF

3 to 4.8 V

PGND

AM06138

TS4604 Typical application

Table 3. Pin descriptions

Pin number I/O

1 I +LDL Left line driver positive input channel

2 I -LDL Left line driver negative input channel

3 O OUTLDL Left line driver output channel

4 P AGND Analog line driver power ground

5 I ENLD Line driver enable input pin (active high)

6 O PVSSLD Output from line drive charge pump

7 I/O CNLD Line driver charge pump flying capacitor negative terminal

8 I/O CNHP Headset charge pump flying capacitor negative terminal

9 I/O PVSSHP Output from headset drive charge pump

10 I ENHP Headset driver enable input pin (active high)

11 P AGND Headphone analog input power ground

12 O OUTHPL Left headset driver output channel

13 I -HPL Left headset driver negative input channel

14 I +HPL Left headset driver positive input channel

15 I +HPR Right headset driver positive input channel

(1)

Pin name Pin description

16 I -HPR Right headset driver negative input channel

17 O OUTHPR Right headset driver output channel

18 NC Not connected

19 P PGND Headset driver power ground

20 P PVCCHP

Headset driver power supply voltage

(2)

21 I/O CPHP Headset charge pump flying capacitor positive terminal

22 I/O CPLD Line driver charge pump flying capacitor positive terminal

23 P PVCCLD

Line driver power supply voltage

(2)

24 P PGND Line driver power ground

25 I EUVP External undervoltage protection input pin

26 O OUTLDR Right line driver output channel

27 I -LDR Right line driver negative input channel

28 I +LDR Right line driver positive input channel

1. I = input, O = output, P = power

2. PVccHP and PVccLD are internally connected, so PVccHP must be equal to PVccLD.

Doc ID 17913 Rev 1 5/31

Electrical characteristics TS4604

3 Electrical characteristics

Table 4. Common part: VCC = +3.3 V, GND = 0 V, CPhp = CPld = 1 µF, T

amb

= 25°C

(unless otherwise specified)

Symbol Parameters and test conditions Min. Typ. Max. Unit

V

V

IL

V

IH

I

IH

I

IL

F

osc

and V

ENHP

V

and V

ENHP

High level input current (ENHP and ENLD) -1 1 µA

Low level input current (ENHP and ENLD) -1 1 µA

Internal negative voltage switching frequency, all temperature
range

Vup External undervoltage detection threshold 1.15 1.25 1.35 V

Ihyst External undervoltage detection hysteresis current 5 µA

Vhyst Pvcc_HP/LD Internal undervoltage detection hysteresis 200 mV

Pvcc_HP/LD internal undervoltage detection

Vuv l

– power up
– power down

Av Overall external gain (R2 ≤ 100 kΩ, R1 = R2/Av)

Input voltage low 38 40 43 % Vcc

ENLD

Input voltage high 57 60 66 % Vcc

ENLD

400 550 800 kHz

2.8

2.6

0
1

20
10

V

dB

V/V

6/31 Doc ID 17913 Rev 1

TS4604 Electrical characteristics

Table 5. Headset driver part: VCC = +3.3 V, GND = 0 V,

ENHP = V
T

= 25°C (unless otherwise specified)

amb

, ENLD = GND, CPhp = CPld = 1 µF, Av = 1 (R1 = R2 = 10 kΩ),

CC

Symbol Parameters and test conditions Min. Typ. Max. Unit

I

cc

Supply current (no input signal, no load) 5 6.5 mA

Headset overall standby current (no input signal):
V

I

ENHP

V

io

P

o

P

o

THD + N

PSRR

t

WU

t

STBY

Xtalk

SNR Signal-to-noise ratio (A-weighting): R

CMRR

V

N

(1)

CL

= GND

ENHP

= 38% V

V

ENHP

CC

Input offset voltage -7 0 7 mV

Headphone output power:
THD + N = 1% max, f = 1 kHz, BW = 22 kHz, RL = 16 Ω 45 65 mW

Headphone output power:
THD + N = 1% max, f = 1 kHz, BW = 22 kHz, R

= 32 Ω 30 45 mW

L

Total harmonic distortion + noise:

= 16 Ω, Po = 60 mW, f = 20 Hz to 20 kHz, BW = 22 kHz 0.05 %

R

L

Headphone power supply rejection ratio with AC inputs
grounded: f = 217 Hz,V

ripple

= 200 mV

pp

Total wake-up time 30 ms

Standby time 20 µs

Crosstalk headphone to line:
Pout = 50 mW, R

= 16 Ω, f = 20 Hz to 20 kHz -100 dB

L

= 16 Ω, Po = 60 mW 102 dB

L

Common-mode rejection ratio:
f = 20 Hz to 20 kHz, Vic = 200 mVpp -70 dB

Output voltage noise: f = 20 Hz to 20 kHz, A-weighted 7.6 µV

Capacitive load:

= 16 Ω to 100 Ω

R

L

RL > 100 Ω

1. Higher capacitive loads are possible by adding a serial resistor of 47 Ω in the line driver output.

1

90 dB

5

100

400
100

µA

RMS

pF

Doc ID 17913 Rev 1 7/31

Electrical characteristics TS4604

Table 6. Line driver part: VCC = +3.3 V, GND = 0 V, Av = 1 (R1 = R2 = 10 kΩ), ENLD = VCC,

ENHP = GND, CPhp = CPld = 1 µF, R
T

= 25°C (unless otherwise specified)

amb

= 10 kΩ,

L

Symbol Parameters and test conditions Min. Typ. Max. Unit

I

cc

Supply current (no input signal, no load) 5 6.5 mA

Line drive standby current (no input signal)

I

ENLD

V

V

SWING

PSRR

t

WU

t

STBY

= GND

ENLD

= 38% V

V

ENLD

io

Input offset voltage -7 0 +7 mV

CC

Output voltage swing:

= 10 kΩ, CL= 100 pF, THD+N = 0.1% 2.1 Vrms

R

L

Line driver power supply rejection ratio with AC inputs
grounded: f = 217 Hz, V

ripple

= 200 mV

pp

90 dB

Wake-up time from shutdown 30 ms

Standby time 20 µs

5

100

V

SNR Signal-to-noise ratio (A-weighting): Vin = 1.7 Vrms 102 dB

V

N

Output voltage noise: f = 20 Hz to 20 kHz, A-weighted 8 µV

GBw Gain bandwidth product 1 MHz

Sr Slew rate 0.5 V / µs

THD+N

BW = 22 kHz, R
f = 20 Hz to 20 kHz

= 10 kΩ, VO = 1.5 Vrms, Av = 1,

L

0.001 %

CMRR f = 20 Hz to 20 kHz, Vic = 200 mVpp -70 dB

Xtalk

CL

1. Higher capacitive loads are possible by adding a serial resistor of 47 Ω in the line driver output.

Crosstalk channel:
f = 20 Hz to 20 kHz, Vo = 1.5 Vrms, R

(1)

Capacitive load: RL > 5 kΩ 400 pF

= 5 kΩ -120 dB

L

µA

RMS

8/31 Doc ID 17913 Rev 1

TS4604 Characteristics of the line driver

3.03.13.23.33.43.53.63.73.83.94.04.14.24.34.44.54.64.74.8

1.9

2.0

2.1

2.2

2.3

2.4

THD+N=1%

THD+N=0.1%

RL ≥ 5kΩ, F=1kHz
BW<30kHz, Ta=25 C
Line Driver

Output Voltage (Vrms)

Power Supply Voltage Vcc (V)

100 1000

1E-3

0.01

0.1

1

10

F=80Hz

F=1kHz

F=8kHz

RL = 5kΩ to 10kΩ
Vcc = 3.3V to 4.8V, G = 20dB
Inputs = 0° & 180°
BW < 30kHz, Tamb = 25°C

THD+N (%)

Output Voltage (mVrms)

100 1000 10000

1E-3

0.01

0.1

1

Vo=2Vrms

Vo=1.5Vrms

RL = 5kΩ to 10k

Ω

Vcc = 3.3V to 4.8V
G = 20dB, Inputs = 0° & 180

°

Bw < 20kHz, Tamb = 25°C

20k20

THD + N (%)

Frequency (Hz)

4 Characteristics of the line driver

Figure 2. Current consumption vs. power

Figure 3. Output voltage vs. power supply

supply

5.7

5.6

5.5

5.4

5.3

5.2

5.1

5.0

4.9

4.8

4.7

4.6

4.5

Quiescent supply current Icc (mA)

4.4

3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

No Load; No input signal
Line Driver
Ta=25°C

Power Supply Voltage Vcc (V)

Figure 4. THD+N vs. output power (G=0 dB) Figure 5. THD+N vs. output power (G=20 dB)

10

RL = 5kΩ to 10kΩ
Vcc = 3.3V to 4.8V, G = 0dB

1

Inputs = 0° & 180°
BW < 30kHz, Tamb = 25°C

0.1

THD+N (%)

0.01

1E-3

1E-4

10 100 1000

Output Voltage (mVrms)

Figure 6. THD+N vs. frequency (G=0 dB) Figure 7. THD+N vs. frequency (G=20 dB)

1

RL = 5kΩ to 10k
Vcc = 3.3V to 4.8V
G = 0dB, Inputs = 0° & 180

0.1

Bw < 20kHz, Tamb = 25°C

0.01

THD + N (%)

1E-3

1E-4

Ω

100 1000 10000

Frequency (Hz)

F=1kHz

°

F=8kHz

F=80Hz

Vo=2Vrms

Vo=1.5Vrms

20k20

Doc ID 17913 Rev 1 9/31

Characteristics of the line driver TS4604

100 1000 10000

-130

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

G=0dB

G=20dB

20k

20

Vripple = 200mVpp
Vcc = 3.3V
Inputs = grounded
RL ≥ 5k

Ω

Tamb = 25°C

PSRR (dB)

Frequency (Hz)

1000 10000 100000 1000000 1E7

-80

-70

-60

-50

-40

-30

-20

-10

0

10

Vcc = 3.3V, G=0dB
No load
Tamb = 25°C

Gain (dB)

Frequency (Hz)

Figure 8. CMRR vs. frequency Figure 9. PSRR vs. frequency

0

Δ

Vic = 200mVpp

-10

Vcc = 3.3V
RL ≥ 5k

-20

-30

-40

CMRR (dB)

-50

-60

-70

-80

20

Figure 10. Crosstalk vs. frequency

0

-10

-20

-30

-40

-50

-60

-70

-80

-90

Crosstalk (dB)

-100

-110

-120

-130

-140

-150

Ω

Tamb = 25°C

G=20dB

100 1000 10000

Frequency (Hz)

left to right & right to left channel

Vcc = 3.3V
Vout = 2Vrms
Right to Left & Left to Right
RL ≥ 5k

Ω

Tamb = 25°C

G=20dB

20

100 1000 10000

Frequency (Hz)

G=0dB

G=0dB

20k

Figure 11. Crosstalk vs. frequency

headset to line driver

0

-10

Vcc = 3.3V, G=0dB

-20

RL = 16Ω on HP

-30

Po = 50 mW on HP

-40

LD inputs grounded

-50

Tamb = 25°C

-60

-70

-80

-90

Crosstalk (dB)

-100

-110

-120

-130

-140

20k

-150

20

100 1000 10000

HP to Line Left

Frequency (Hz)

HP to Line Right

20k

Figure 12. Output signal spectrum Figure 13. Frequency response

-20

-30

Vcc = 3.3V, G=0dB

-40

RL=10k

-50

-60

-70

-80

-90

-100

-110

Output Signal (dBV)

-120

-130

-140

-150

-160

10/31 Doc ID 17913 Rev 1

Ω

Tamb = 25°C

100 1000 10000

Frequency (Hz)