Datasheet TS4604 Datasheet (ST)

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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

TS4604

integrated reference to ground

TSSOP28

Pin connections (top view)

+LDL

-LDL

OUTLDL

AGND

ENLD

PVSSLD

CNLD

CNHP

PVSSHP

ENHP

AGND

OUTHPL

-HPL

+HPL

+LDR

-LDR

OUTLDR

EUVP

PGND

PVCCLD

CPLD

CPHP

PVCCHP

PGND

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

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

oper

stg

thja

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

Thermal resistance junction to ambient

Power dissipation Internally limited

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

200 °C/W

(4)

2 8

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

Supply voltage 3 to 4.8 V

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

1. With heatsink surface = 125 mm2.

Line drive load resistor ≥ 5kΩ

Headset drive load resistor ≥ 16 Ω

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

2.2 µF

-LDR

+LDR

-LDL

+LDL

-HPR

+HPR

-HPL

+HPL

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

PVCCHP

1 µF

PVSSHP

4/31 Doc ID 17913 Rev 1

Powe r

CNLD

PVCCLD

PVSSLD

EUVP

ENHP

ENLD

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

osc

and V

ENHP

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/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),

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

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

Headset overall standby current (no input signal): V

ENHP

THD + N

PSRR

STBY

Xtalk

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

CMRR

(1)

= GND

ENHP

= 38% V

ENHP

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

Total harmonic distortion + noise:

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

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

ripple

= 200 mV

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

= 16 Ω, Po = 60 mW 102 dB

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

RL > 100 Ω

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

90 dB

100

400 100

µA

RMS

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,

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

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

Line drive standby current (no input signal)

ENLD

SWING

PSRR

STBY

= GND

ENLD

= 38% V

ENLD

Input offset voltage -7 0 +7 mV

Output voltage swing:

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

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

ripple

= 200 mV

90 dB

Wake-up time from shutdown 30 ms

Standby time 20 µs

100

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

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,

0.001 %

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

Xtalk

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

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

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

Vo=2Vrms

Vo=1.5Vrms

RL = 5kΩ to 10k

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)

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

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)

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

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

G=0dB

G=20dB

20k

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

Tamb = 25°C

PSRR (dB)

Frequency (Hz)

1000 10000 100000 1000000 1E7

-80

-70

-60

-50

-40

-30

-20

-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

Vic = 200mVpp

-10

Vcc = 3.3V RL ≥ 5k

-20

-30

-40

CMRR (dB)

-50

-60

-70

-80

Figure 10. Crosstalk vs. frequency

-10

-20

-30

-40

-50

-60

-70

-80

-90

Crosstalk (dB)

-100

-110

-120

-130

-140

-150

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

Tamb = 25°C

G=20dB

100 1000 10000

Frequency (Hz)

G=0dB

20k

Figure 11. Crosstalk vs. frequency

headset to line driver

-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

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

Tamb = 25°C

100 1000 10000

Frequency (Hz)

TS4604 Characteristics of the headset driver

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

200

400

600

800

1000

1200

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

Standby current Istby (nA)

Power Supply Voltage Vcc (V)

5 Characteristics of the headset driver

Figure 14. Current consumption vs. power

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 Headset Driver Ta=25°C

Power Supply Voltage Vcc (V)

Figure 16. Output power vs. power supply

= 16 Ω, G = 0 dB)

180

160

140

120

100

Power Output (mW)

3.0 3.1 3.2 3.33.4 3.5 3.6 3.7 3.83.9 4.0 4.1 4.2 4.3 4. 4 4.5 4.6 4.7 4.8

THD+N=10% (180°)

THD+N=1% (0°)

Power Supply Voltage Vcc (V)

THD+N=10% (0°)

THD+N=1% (180°)

RL = 16Ω, F=1kHz G=0dB BW<30kHz, Ta=25 C Headset Driver

Figure 15. Standby current vs. power supply

Figure 17. Output power vs. power supply

(RL = 16 Ω, G = 20 dB)

180

160

THD+N=10% (180°)

140

120

100

Power Output (mW)

3.0 3.1 3.2 3.33.4 3.5 3.6 3.7 3.83.9 4.0 4.1 4.2 4.3 4. 4 4.5 4.6 4.7 4.8

THD+N=1% (0°)

Power Supply Voltage Vcc (V)

THD+N=10% (0°)

THD+N=1% (180°)

RL = 16Ω, F=1kHz G=20dB BW<30kHz, Ta=25 C Headset Driver

Doc ID 17913 Rev 1 11/31

Characteristics of the headset driver TS4604

0.1 1 10 100

1E-3

0.01

0.1

F=80Hz

F=1kHz

F=8kHz

RL = 16Ω Vcc = 3.0V, G = 0dB Inputs = 0° BW < 30kHz, Tamb = 25°C

THD+N (%)

Output Power (mW)

0.1 1 10 100

1E-3

0.01

0.1

F=80Hz

F=1kHz

F=8kHz

RL = 16Ω Vcc = 3.3V, G = 20dB Inputs = 0° BW < 30kHz, Tamb = 25°C

THD+N (%)

Output Power (mW)

Figure 18. Output power vs. power supply

= 32 Ω, G = 0 dB)

180

160

140

120

100

Power Output (mW)

3.0 3.1 3.2 3.33.4 3.5 3.6 3.7 3.83.9 4.0 4.1 4.2 4.3 4. 4 4.5 4.6 4.7 4.8

RL = 32Ω, F=1kHz G=0dB, 0° & 180° BW<30kHz, Ta=25 C Headset Driver

THD+N=10%

THD+N=1%

Power Supply Voltage Vcc (V)

Figure 20. THD+N vs. output power

= 16 Ω, G = 20 dB, V

= 3.0 V

inputs in-phase)

RL = 16Ω Vcc = 3.0V, G = 20dB Inputs = 0°

BW < 30kHz, Tamb = 25°C

Figure 19. Output power vs. power supply

(RL = 32 Ω, G = 20 dB)

180

160

140

120

100

Power Output (mW)

3.0 3.1 3.2 3.33.4 3.5 3.6 3.7 3.83.9 4.0 4.1 4.2 4.3 4. 4 4.5 4.6 4.7 4.8

THD+N=10%

THD+N=1%

RL = 32Ω, F=1kHz G=20dB, 0° & 180° BW<30kHz, Ta=25 C Headset Driver

Power Supply Voltage Vcc (V)

Figure 21. THD+N vs. output power

(RL = 16 Ω, G = 0 dB, V

= 3.0 V

inputs in-phase)

Figure 22. THD+N vs. output power

0.1

THD+N (%)

0.01

1E-3

0.1 1 10 100

Output Power (mW)

= 16 Ω, G = 0 dB, V

F=8kHz

F=80Hz

inputs out-of-phase)

RL = 16

Vcc = 3.0V, G = 0dB Inputs = 180

BW < 30kHz, Tamb = 25°C

0.1

THD+N (%)

0.01

1E-3

0.1 1 10 100

F=8kHz

F=1kHz

F=80Hz

Output Power (mW)

F=1kHz

= 3.3 V

Figure 23. THD+N vs. output power

(RL = 16 Ω, G = 20 dB, V inputs in-phase)

= 3.3 V

12/31 Doc ID 17913 Rev 1

TS4604 Characteristics of the headset driver

0.1 1 10 100

1E-3

0.01

0.1

F=80Hz

F=1kHz

F=8kHz

RL = 16Ω Vcc = 3.3V, G = 0dB Inputs = 180° BW < 30kHz, Tamb = 25°C

THD+N (%)

Output Power (mW)

0.1 1 10 100

1E-4

1E-3

0.01

0.1

F=80Hz

F=1kHz

F=8kHz

RL = 32Ω Vcc = 3.0V, G = 0dB Inputs = 0° & 180° BW < 30kHz, Tamb = 25°C

THD+N (%)

Output Power (mW)

Figure 24. THD+N vs. output power

(RL = 16 Ω, G = 0 dB, VCC = 3.3 V inputs in-phase)

RL = 16Ω Vcc = 3.3V, G = 0dB Inputs = 0°

BW < 30kHz, Tamb = 25°C

0.1

THD+N (%)

0.01

1E-3

0.1 1 10 100

F=80Hz

Output Power (mW)

F=8kHz

Figure 26. THD+N vs. output power

(RL = 16 Ω, G = 20 dB, VCC = 4.8 V, inputs in-phase)

RL = 16

Vcc = 4.8V, G = 20dB Inputs = 0

BW < 30kHz, Tamb = 25°C

0.1

THD+N (%)

F=8kHz

F=1kHz

Figure 25. THD+N vs. output power

(RL = 16 Ω, G = 0 dB, VCC = 3.3 V, inputs out-of-phase)

Figure 27. THD+N vs. output power

(RL = 16 Ω, G = 0 dB, VCC = 4.8 V inputs in-phase)

RL = 16

Vcc = 4.8V, G = 0dB

0.1

THD+N (%)

0.01

Inputs = 0 BW < 30kHz, Tamb = 25°C

F=8kHz

0.01

1E-3

0.1 1 10 100

Output Power (mW)

Figure 28. THD+N vs. output power

= 16 Ω, G = 0 dB, VCC = 4.8 V

inputs out-of-phase)

RL = 16

Vcc = 4.8V, G = 0dB Inputs = 180

BW < 30kHz, Tamb = 25°C

0.1

THD+N (%)

0.01

1E-3

0.1 1 10 100

F=1kHz

Output Power (mW)

F=80Hz

F=1kHz

F=8kHz

1E-3

1E-4

0.1 1 10 100

F=1kHz

F=80Hz

Output Power (mW)

Figure 29. THD+N vs. output power

(RL = 32 Ω, VCC = 3.0 V, G = 0 dB)

Doc ID 17913 Rev 1 13/31

Characteristics of the headset driver TS4604

0.1 1 10 100

1E-4

1E-3

0.01

0.1

F=80Hz

F=1kHz

F=8kHz

RL = 32

Vcc = 3.3V, G = 0dB Inputs = 0° & 180

BW < 30kHz, Tamb = 25°C

THD+N (%)

Output Power (mW)

0.1 1 10 100

1E-4

1E-3

0.01

0.1

F=80Hz

F=1kHz

F=8kHz

RL = 32Ω Vcc = 4.8V, G = 0dB Inputs = 0° & 180° BW < 30kHz, Tamb = 25°C

THD+N (%)

Output Power (mW)

100 1000 10000

1E-3

0.01

0.1

Po=1mW

Po=15mW

RL = 16

Vcc = 3.0V to 4.8V G = 0dB, Inputs = 0° & 180

Bw < 20kHz, Tamb = 25°C

20k20

THD + N (%)

Frequency (Hz)

Figure 30. THD+N vs. output power

= 32 Ω, VCC = 3.0 V, G = 20 dB)

RL = 32Ω Vcc = 3.0V, G = 20dB Inputs = 0° & 180°

BW < 30kHz, Tamb = 25°C

0.1

THD+N (%)

0.01

1E-3

0.1 1 10 100

Output Power (mW)

F=8kHz

F=80Hz

Figure 32. THD+N vs. output power

= 32 Ω, VCC = 3.3 V, G = 20 dB)

RL = 32Ω Vcc = 3.3V, G = 20dB Inputs = 0° & 180°

BW < 30kHz, Tamb = 25°C

Figure 31. THD+N vs. output power

(RL = 32 Ω, VCC = 3.3 V, G = 0 dB)

F=1kHz

Figure 33. THD+N vs. output power

(RL = 32 Ω, VCC = 4.8 V, G = 0 dB)

0.1

THD+N (%)

0.01

1E-3

0.1 1 10 100

Output Power (mW)

Figure 34. THD+N vs. output power

= 32 Ω, VCC = 4.8 V, G = 20 dB)

RL = 32Ω Vcc = 4.8V, G = 20dB Inputs = 0° & 180°

BW < 30kHz, Tamb = 25°C

0.1

THD+N (%)

0.01

1E-3

0.1 1 10 100

14/31 Doc ID 17913 Rev 1

Output Power (mW)

F=8kHz

F=80Hz

F=1kHz

Figure 35. THD+N vs. frequency

(RL = 16 Ω, G = 0 dB)

F=8kHz

F=1kHz

F=80Hz

TS4604 Characteristics of the headset driver

100 1000 10000

1E-3

0.01

0.1

Po=1mW

Po=10mW

RL = 32Ω Vcc = 3.0V to 4.8V G = 0dB, Inputs = 0° & 180° Bw < 20kHz, Tamb = 25°C

20k20

THD + N (%)

Frequency (Hz)

Figure 36. THD+N vs. frequency

= 16 Ω, G = 20 dB)

RL = 16Ω Vcc = 3.0V to 4.8V G = 20dB, Inputs = 0° & 180° Bw < 20kHz, Tamb = 25°C

THD + N (%)

0.01

1E-3

0.1

100 1000 10000

Frequency (Hz)

Po=1mW

Po=15mW

Figure 38. THD+N vs. frequency

= 32 Ω, G = 20 dB)

RL = 32

Vcc = 3.0V to 4.8V G = 20dB, Inputs = 0° & 180 Bw < 20kHz, Tamb = 25°C

0.1

THD + N (%)

0.01

1E-3

100 1000 10000

Po=1mW

Po=10mW

Frequency (Hz)

Figure 37. THD+N vs. frequency

(RL = 32 Ω, G = 0 dB)

20k20

Figure 39. CMRR vs. frequency (headset)

Vic = 200mVpp

-10

Vcc = 3.3V

-20

RL ≥ 16

Tamb = 25°C

-30

-40

-50

CMRR (dB)

-60

-70

-80

-90

20k20

-100

100 1000 10000

G=20dB

G=0dB

Frequency (Hz)

20k

Figure 40. PSSR vs. frequency (headset) Figure 41. Crosstalk vs. frequency

(left to right, Pout = 50 mW)

-10

Vcc = 3.3V

-20

Pout = 50mW, G=0dB

-30

RL = 16

-40

Tamb = 25°C

-50

-60

-70

-80

-90

Crosstalk (dB)

-100

-110

-120

-130

-140

-150

Left to Right

100 1000 10000

Frequency (Hz)

PSRR (dB)

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

-110

-120

-130

Vripple = 200mVpp Vcc = 3.3V Inputs = grounded RL ≥ 16

Tamb = 25°C

G=20dB

100 1000 10000

Frequency (Hz)

G=0dB

20k

Doc ID 17913 Rev 1 15/31

Right to Left

20k

Characteristics of the headset driver TS4604

Figure 42. Crosstalk vs. frequency

(left to right, Pout = 35 mW)

-10

Vcc = 3.3V

-20

Pout = 35mW, G=0dB

-30

RL = 32

-40

-50

-60

-70

-80

-90

Crosstalk (dB)

-100

-110

-120

-130

-140

-150

Tamb = 25°C

Left to Right

100 1000 10000

Frequency (Hz)

Figure 44. Frequency response

-10

-20

-30

-40

Gain (dB)

-50

Vcc = 3.3V, G=0dB

-60

No load

-70

Tamb = 25°C

-80

1000 10000 100000 1000000 1E7

Frequency (Hz)

Right to Left

Figure 43. Crosstalk vs. frequency

line driver to headset

-10

Vcc = 3.3V

-20

Vout = 2Vrms on LD, G=0dB

-30

RL = 10kΩ on LD

-40

HP inputs = ground

-50

Tamb = 25°C

-60

-70

-80

-90

Crosstalk (dB)

20k

-100

-110

-120

-130

-140

-150

LD to HP left

100 1000 10000

Frequency (Hz)

LD to HP right

20k

16/31 Doc ID 17913 Rev 1

TS4604 Application information

6 Application information

6.1 General description

The TS4604 is a stereo headset driver and a ground-referenced stereo audio line driver. To save energy, each audio path, line driver or headphone can be independently set to standby mode.

The headphone delivers up to 100 mW into a 16 Ω load, and the line driver drives up to 2 Vrms into 5k or more. The gain can be set up to 20 dB by changing the values of the external gain resistors.

The outputs of the headphone and line driver are protected against overloads. Overloads can occur when the outputs are short-circuited between them or to Gnd or to V also an internal thermal shutdown activated at 150°C (typical) and deactivated at 120°C (typical).

To remove the bulky output DC blocking capacitor and maximize the output swing of the amplifier, the TS4604 embeds a low noise internal negative supply. All amplifiers are supplied between a positive voltage +Vp and a negative voltage -Vn. With this architecture, the output voltage is centered on 0 V, allowing the swing of the output voltage between the positive and negative rail, as depicted in Figure 45.

. There is

Both the line driver and headset driver use this architecture.

Figure 45. TS4604 voltage f

In-

In+

or one channel

Negative

supply

Vreg

Vcc

Vreg

+Vp

-Vn

Out

0 V

-Vn

Note: The PVSSHP and PVSSLD voltages are generated internally by the internal negative

supply. To avoid damage to the TS4604, do not connect an external power supply on the PVSSHP and PVSSLD pins.

AM06139

Doc ID 17913 Rev 1 17/31

Application information TS4604

6.2 Use of ceramic capacitors

We advise using ceramic capacitors for the decoupling, flying or tank capacitors because of their low ESR properties. The rated voltage of the ceramic capacitor, however, is an important parameter to take into consideration.

A 1 µF/6.3 V capacitor used at 4.8 V DC typically loses about 40% of its value. In fact, with a

4.8 V power supply voltage, the decoupling value is about 0.6 µF instead of 1 µF. Because the decoupling capacitor influences the THD+N in the medium-to-high frequency region, this capacitor variation becomes decisive. In addition, less decoupling means higher overshoots, which can be problematic if they reach the power supply's AMR value (5.5 V).

This is why it is recommend to use a 1 µF/10 V/X5R or a 2.2 µF/6.3 V/X5R, or a new kind of ceramic capacitor with a low DC bias variation rated at 6.3 V.

If a 1 µF/10 V ceramic capacitor is used, at 4.8 V the capacitance will be 0.82 µF.

If a 2.2 µF/6.3 V ceramic capacitor is used, at 4.8 V the capacitance will be 1.1 µF.

6.3 Flying and tank capacitor for the internal negative supply

The TS4604 embeds two independent internal negative supplies as shown in Figure 1. Each of them requires two capacitors to work properly (a flying and a tank capacitor). The internal negative supply capacitor must be correctly selected to generate an efficient negative voltage.

Two flying capacitors (CHP and CLD) of 1 µF each with low ESR are recommended for internal negative power supply operation.

● CHP between pins 8 and 21.

● CLD between pins 7 and 22.

Two tank capacitors (CPvss_HP and CPvss_LD) of 1 µF each with low ESR are recommended for internal negative power supply energy storage.

● CPvss_HP between pin 9 and ground.

● CPvss_LD between pin 6 and ground.

An X5R dielectric for capacitor tolerance should be used. In order to take into consideration the ΔC/ΔV variation of this type of dielectric (see Section 6.2 above), we also recommend:

● a 10 V DC rating voltage for 4.8 V power supply operation.

● a 6.3 V DC rating operation for 3.3 V power supply operation.

These capacitors must be placed as close as possible to the TS4604 to minimize parasitic inductance and resistance that have a negative impact on the audio performance.

6.4 Power supply decoupling capacitor (Cs)

A 1 µF decoupling capacitor (Cs) with low ESR is mandatory for the positive power supply X5R dielectric for capacitor tolerance behavior. In order to take into consideration the ΔC/ΔV variation of this type of dielectric (see Section 6.2 above), it is also recommended to use:

● a 10 V DC rating voltage for 4.8 V power supply operation.

● a 6.3 V DC rating operation for 3.3 V power supply operation.

18/31 Doc ID 17913 Rev 1

TS4604 Application information

These capacitors must be placed as close as possible to the TS4604 to minimize parasitic inductance and resistance that have a negative impact on the audio performance.

6.5 Input coupling capacitor (Cin)

An input coupling capacitor (Cin) might be used for TS4604 operation to block any DC component of the audio signal.

Cin starts to have an effect in the low frequency region. Cin forms with Rin a high-pass filter with a -3 dB cut-off frequency.

Fc 3dB–()

Example

A differential input gain as shown in Figure 46 on page 20 with the gain equalling 0 dB (Rin = 10 kΩ, Rfd = 10 kΩ) and an input capacitor of 2.2 µF gives:

----------------------------------------- -

2.π Rin Cin⋅⋅

Hz()=

--------------------------------------------------------------- - 7.2H z==

⋅⋅

2.π 10000 2.2 e10

The high-pass filter has a -3 dB cut-off frequency at 7.2 Hz in this case.

6.6 Range of the gain setting resistors

The TS4604 can be use in different configurations, as shown in figures 46, 47 and 48.

The gain is given by the external resistors Rfd divided by Rin. The feedback resistor Rfd does not exceed 100 kΩ for closed-loop stability reasons.

Ta bl e 7 gives the recommended resistor values and the gain for different types of

application.

Table 7. Recommended resistors values

Rin Rfd Differential gain Inverting gain Non-inverting gain

Ω 10 kΩ 0 dB 0 dB 6 dB

10 k

Ω 20 kΩ 6 dB 6 dB 10 dB Ω 50 kΩ 14 dB 14 dB 16 dB

10 k

Ω 47 kΩ 20 dB 20 dB 21 dB

4.7 k

10 k

Ω 100 kΩ 20 dB 20 dB 21 dB

6–

Doc ID 17913 Rev 1 19/31

Application information TS4604

Figure 46. Example of a TS4604 differential input

Rfd

Cin

Rin

Vin-

Vin+

Cin

Rin

Rfd

Figure 47. Example of a TS4604 inverting input

Rfd

Cin

Vin-

Rin

Vout

AM06140

Vout

AM06141

Figure 48. Example of a TS4604 non-inverting input

Cin

Vin+

Cin

20/31 Doc ID 17913 Rev 1

Rin

Rfd

Vout

AM06142

TS4604 Application information

6.7 Performance of CMRR

When the TS4604 is used in differential mode (Figure 46), because of the resistor matching the CMRR can have important variations.

To minimize these variations, we recommend using the same kind of resistor (same tolerance).

The following equation is valid for frequencies ranging from DC to about kHz. The equation is simplified by neglecting the ΔR² terms. ΔR is the tolerance value as a percentage.

100

CMRR 20

----------- -

4ΔR

It is extremely important to correctly match the resistors to obtain a good CMRR.

All the tests have been performed with resistors with a tolerance value of 0.1%.

Example: With ΔR = 1% the minimum CMRR would be 34 dB. With ΔR = 0.1% the minimum CMRR would be 54 dB.

Rfd

⎛⎞

--------- -+

Rin

dB()log⋅≈

⎝⎠

6.8 Internal and external undervoltage detection

The TS4604 embeds two UVLOs: one internal and one external.

6.8.1 Internal UVLO

The internal UVLO monitors the power supply via pins PVCC_HP (20) and PVCC_LD(23). The threshold is set to 2.8 V with a 200 mV hysteresis. If the power supply decreases to

2.6 V, the TS4604 switches to standby mode. To switch the device on again, the power supply voltage must increase to above 2.8 V.

Refer to Ta bl e 4 for the tolerance of the UVLO voltage.

6.8.2 External UVLO

The Ex_UVP pin (25) is an external undervoltage detection input that can be used to start up or shutdown the TS4604 by applying the correct voltage value. A 1.25 V internal precision voltage is used as a reference to monitor the voltage applied to the Ex_UPVP pin.

To set a desired shutdown threshold and hysteresis for the application, a resistor divider can be calculated as follows.

Vu vp 1.25V

Vhyst≈ 5μAR3

R1 R2+()

-------------------------- -

⋅=

⎛⎞

------- - 1+

⋅⋅

⎝⎠

with the condition R3>>R1//R2.

Doc ID 17913 Rev 1 21/31

Application information TS4604

For example, to obtain Vuvp = 3.3 V with a hysteresis of 200 mV:

● R1 = 1 kΩ

● R2 = 1.6 kΩ

● R3 = 15 kΩ

Figure 49. External UVLO

Vcc

External sense voltage

1.6 k R2

5 µA

15 k

1 k

Figure 50. Hysteresis of the external UVLO

Icc

VHyst

Precision band gap

1.25 V

TS4604

AM06143

Vuvp

When the external sense voltage (ESV) increases, the TS4604 stays in standby mode until the EUVP pin reaches 1.25 V (voltage across the divider R1, R2). At this point, the TS4604 starts, as does the internal 5 µA current source connected to the EUVP pin. Thanks to this 5 µA current, a voltage drop is created across the R3 resistor.

22/31 Doc ID 17913 Rev 1

External sense voltage

AM06144

TS4604 Application information

To switch the TS4604 back to standby, the voltage across the divider R1, R2 has to be lower than 1.25 V - VHyst × R1/(R1 + R2). The ESV can be an external voltage or simply the power supply voltage PVcc_LD/HD.

6.9 2nd order Butterworth low-pass filter

The TS4604 can also be configured as a low-pass filter to be driven directly by a DAC output. It can be used, for example, as a 2nd order low-pass filter, with either a differential input or a single-ended input.

Figure 51 and Figure 52 depict these two kinds of application and represent a multiple

feedback 2nd order low-pass filter.

An AC-coupling capacitor should be added to block any DC component from the source, which helps to reduce the output DC offset to a minimum.

Figure 51. Multi-feedback filter with

Cin

Vin-

Vin+

Cin

differential input

Rin

Rfd

Figure 52. Multi-feedback filter with single-

ended input

Rfd

Vout

Cin

Vin-

Rin

Vout

Rfd

AM06145

AM06146

Example 2nd-order multi-feedback filter in differential mode

Figure 53 shows a filter in differential mode with a cut-off frequency at 30 kHz (configured as

per the values in Ta bl e 8 , which proposes various filter options using a differential input).

Doc ID 17913 Rev 1 23/31

Application information TS4604

Figure 53. Frequency response 2nd-order MFB filter

-1

-2

-3

Gain (dB)

-4

-5

R1 = Rin = 10kΩ,

-6

Rfd = 24kΩ,

-7

C1 = 680pF,

-8

C2 = 120pF,

-9

1 10 100 1000 10000 100000

Frequency (Hz)

Table 8. Recommended values for 2nd order low-pass filter

Low-pass filter Rin R1 Rfd C1 C2

25 kHz 10 k

30 kHz 10 k

Ω 10 kΩ 15 kΩ 1 nF 200 pF Ω 10 kΩ 24 kΩ 680 pF 120 pF

6.10 ESD protection and compliance

To provide excellent ESD immunity, an audio line IPAD EMIF04-EAR02M8) can be added at the output of the TS4604 (Figure 54).

By adding the IPAD, the TS4604 complies with the standard IEC 61000-4-2 level 4 on the external pins.

● OUT_HPL and OUT_HPR for the headphone driver.

● OUT_LDL and OUT_LDR for the Line driver.

(a)

(STMicroelectronics reference

a. Copyright ST Microelectronics.

24/31 Doc ID 17913 Rev 1

TS4604 Application information

Figure 54. TS4604 with IPAD for ESD immunity

InR-

InR+

InL-

InL+

TS4604

OUT_R

OUT_L

6.11 Pop-&-click circuitry

Thanks to the internal negative supply the headphone and line driver outputs are referred to ground without the need for bulky in-series capacitors. As a result, the pop created by these bulky capacitors is eliminated. In addition, the TS4604 includes a pop-&-click circuitry that suppresses any residual pop on the outputs, thus enabling the outputs to be virtually pop-&click-free.

A1 A2

Gnd

IPAD

OUT_R

Gnd

OUT_L

AM06147

6.12 Start-up phase

To further improve the pop-&-click performance, two important points must be taken into account during the start-up phase.

Input capacitor

During the start up phase, as long as the AC input coupling capacitors are not fully charged, we suggested to remain the EN_LD and En_HP and/or Ext_UVP pin low.

The constant time for an RC filter is given by:

τ Rin Cin⋅=

We can consider that the input capacitor Cin will be charged at 95% of its maximum value at:

T3τ=

Doc ID 17913 Rev 1 25/31

Application information TS4604

With a gain set at G = 0 dB, a Rin = 10 kΩ and Cin = 2.2 µF, to charge Cin to 95% of its final value, 66 ms are necessary.

Wake-up time of the TS4604

The TS4604 needs 30 ms to become fully operational (see Ta bl e 5 and Ta bl e 6).

The total startup sequence with the settings described being 66 ms, and since the TS4604 needs 30 ms to wake up, the Enable pin for the line driver and/or headphone can be set high 36 ms after the power supply has reached its normal value (Figure 55).

With a lower input capacitance, the startup phase is quicker.

Figure 55. Power-up/down sequence

Supply

Supply ramp

EN_xx

36 ms

Vout

66 ms

6.13 Layout recommendations

Particular attention must be given to the correct layout of the PCB traces and wires between the amplifier, load and power supply.

The power and ground traces are critical since they must provide adequate energy and grounding for all circuits. Good practice is to use short and wide PCB traces to minimize voltage drops and parasitic inductance.

Proper grounding guidelines help improve audio performances, minimize crosstalk between channels, and prevent switching noise from coupling into the audio signal. It is also recommended to use a large-area and multi-via ground plane to minimize parasitic impedance.

Connect all the V

The copper traces that connect the output pins to the load and supply pins should be as wide as possible to minimize the trace resistances.

tracks (PVCCLD and PVCCHP) to one point one the board.

30 ms

AM06148

The gain setting resistors must be placed as close as possible to the input in order to minimize the parasitic capacitors on these inputs pins.

26/31 Doc ID 17913 Rev 1

TS4604 Package information

7 Package information

In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK specifications, grade definitions and product status are available at: www.st.com. ECOPACK

packages, depending on their level of environmental compliance. ECOPACK®

is an ST trademark.

Doc ID 17913 Rev 1 27/31

Package information TS4604

7.1 TSSOP28 package

Figure 56. TSSOP28 pitch 0.65 mm mechanical drawing

Table 9. TSSOP28 pitch 0.65 mm mechanical data

Dimensions

Ref.

Min. Typ. Max. Min. Typ. Max.

A1.200.047

A1 0.05 0.15 0.002 0.006

A2 0.80 1.00 1.05 0.031 0.039 0.041

b 0.19 0.30 0.007 0.011

c 0.09 0.20 0.003 0.008

D 9.60 9.70 9.80 0.378 0.382 0.386

E 6.20 6.40 6.60 0.244 0.252 0.260

E1 4.30 4.40 4.50 0.170 0.173 0.177

e 0.65 0.026

L 0.45 0.60 0.75 0.018 0.024 0.030

L1 1.00 0.040

k0 8

aaa 0.10 0.004

Millimeters Inches

28/31 Doc ID 17913 Rev 1

TS4604 Ordering information

8 Ordering information

Table 10. Order codes

Part number

TS4604IPT -40°C, +85°C External TSSOP28 4604

Temperature

range

Gain Package Marking

Doc ID 17913 Rev 1 29/31

Revision history TS4604

9 Revision history

Table 11. Document revision history

Date Revision Changes

27-Oct-2010 1 Initial release.

30/31 Doc ID 17913 Rev 1

TS4604

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Doc ID 17913 Rev 1 31/31

Datasheet TS4604 Datasheet (ST)

Specifications and Main Features

Frequently Asked Questions

User Manual

1 Absolute maximum ratings and operating conditions

Table 1. Absolute maximum ratings (AMR)

Table 2. Operating conditions

2 Typical application

Figure 1. Simplified application schematics in differential configuration setting

Table 3. Pin descriptions

3 Electrical characteristics

4 Characteristics of the line driver

Figure 3. Output voltage vs. power supply

Figure 12. Output signal spectrum Figure 13. Frequency response

5 Characteristics of the headset driver

Figure 15. Standby current vs. power supply

Figure 39. CMRR vs. frequency (headset)

Figure 40. PSSR vs. frequency (headset) Figure 41. Crosstalk vs. frequency

Figure 44. Frequency response

6 Application information

6.1 General description

6.2 Use of ceramic capacitors

6.3 Flying and tank capacitor for the internal negative supply

6.4 Power supply decoupling capacitor (Cs)

6.5 Input coupling capacitor (Cin)

6.6 Range of the gain setting resistors

Table 7. Recommended resistors values

Figure 46. Example of a TS4604 differential input

Figure 47. Example of a TS4604 inverting input

Figure 48. Example of a TS4604 non-inverting input

6.7 Performance of CMRR

6.8 Internal and external undervoltage detection

6.8.1 Internal UVLO

6.8.2 External UVLO

Figure 49. External UVLO

Figure 50. Hysteresis of the external UVLO

6.9 2nd order Butterworth low-pass filter

Figure 53. Frequency response 2nd-order MFB filter

Table 8. Recommended values for 2nd order low-pass filter

6.10 ESD protection and compliance

Figure 54. TS4604 with IPAD for ESD immunity

6.11 Pop-&-click circuitry

6.12 Start-up phase

Figure 55. Power-up/down sequence

6.13 Layout recommendations

7 Package information

7.1 TSSOP28 package

Figure 56. TSSOP28 pitch 0.65 mm mechanical drawing

Table 9. TSSOP28 pitch 0.65 mm mechanical data

8 Ordering information

Table 10. Order codes

9 Revision history

Table 11. Document revision history