STMicroelectronics TS4995EIJT Schematic [ru]

Features

TS4995

1.2W fully differential audio power amplifier
with selectable standby and 6db fixed gain

■ Differential inputs

■ 90dB PSRR @ 217Hz with grounded inputs

■ Operating from Vcc = 2.5V to 5.5V

■ 1.2W rail to rail output power @ Vcc=5V,

THD+N=1%, F=1kHz, with 8Ω load

■ 6dB integrated fixed gain

■ Ultra-low consumption in standby mode (10nA)

■ Selectable standby mode (active low or active

high)

■ Ultra-fast startup time: 10ms typ. at Vcc=3.3V

■ Available in 9-bump flip-chip (300mm bump

diameter)

■ Ultra-low pops&clicks

Description

The TS4995 is an audio power amplifier capable
of delivering 1.2W of continuous RMS output
power into an 8Ω load at 5V. Thanks to its
differential inputs, it exhibits outstanding noise
immunity.

An external standby mode control reduces the
supply current to less than 10nA. A STBY MODE
pin allows the standby pin to be active HIGH or
LOW. An internal thermal shutdown protection is
also provided, making the device capable of
sustaining short-circuits.

The TS4995 features an internal fixed gain at 6dB
which reduces the number of external
components on the application board.

TS4995 - Flip-Chip9

Pin connections (top view)

Gnd

Gnd

V

V

Bypass Stdby

Bypass Stdby

V

V

765

765

O-

O-

8

8

IN+

IN+

1

1

9

9

2

2

V

V

CC

CC

V

V

O+

O+

4

4

V

V

3

3

IN-

IN-

Stdby Mode

Stdby Mode

The device is equipped with Common Mode
Feedback circuitry allowing outputs to be always
biased at Vcc/2 regardless of the input common
mode voltage.

The TS4995 has been designed for high quality
audio applications such as mobile phones and
requires few external components.

Applications

■ Mobile phones (cellular / cordless)

■ PDAs

■ Laptop / notebook computers

■ Portable audio devices

Device summary table

Part Number Temperature Range Package Packing Marking

TS4995EIJT -40°C to +85°C Lead free flip-chip9 Tape & Reel 95

June 2006 Rev. 1 1/24

www.st.com

24

Contents TS4995

Contents

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

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

3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.1 Differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.2 Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.3 Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.4 Power dissipation and efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.5 Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.6 Wake-up Time: TWU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.7 Shutdown time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.8 Pop performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.9 Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.1 9-bump flip-chip package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2/24

TS4995 Absolute maximum ratings & operating conditions

1 Absolute maximum ratings & operating conditions

Table 1. Absolute maximum ratings (AMR)

Symbol Parameter Value Unit

V

CC

V

T

oper

T

stg

T

R

thja

P

diss

ESD

i

j

Supply voltage

Input voltage

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 W

Machine model 200 V

Human body model 1.5 kV

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 input signal must never exceed VCC + 0.3V / GND - 0.3V.

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

Table 2. Operating conditions

Symbol Parameter Value Unit

V

Supply voltage 2.5 to 5.5 V

CC

Standby Mode Voltage Input:

V

SM

Standby Active LOW
Standby Active HIGH

Standby Voltage Input:

V

STB

Device ON (V
Device OFF (V

T

R

R

1. The minimum current consumption (I
temperature range.

Thermal Shutdown Temperature 150 °C

SD

Load Resistor ≥ 8 Ω

L

Thermal Resistance Junction to Ambient 100 °C/W

thja

(1)

(2)

(3)

=GND) or Device OFF (VSM=VCC)

SM

=GND) or Device ON (VSM=VCC)

SM

) is guaranteed when V

STANDBY

6V

GND to V

CC

200 °C/W

=GND

V

SM

V

SM=VCC

≤ V

STB

STB

≤ VCC

≤ 0.4

(1)

1.5 ≤ V

G

ND

= GND or VCC (i.e. supply rails) for the whole

STB

V

V

V

3/24

Typical application schematic TS4995

2 Typical application schematic

Table 3. External components descriptions

Components Functional description

C

s

C

b

C

in

Supply Bypass capacitor which provides power supply filtering.

Bypass capacitor which provides half supply filtering.

Optional input capacitor making a high pass filter together with Rin. (fcl = 1 / (2 x Pi x Rin x Cin).

Figure 1. Typical application

TS4995

Op ti onal

Vin-

P1

P2

Vin+

Cin 1

330nF
Cin 2

330nF

3

1

8

Vin-

Vin+

BYPASS

BIAS

VCC

2

Cs1

1uF

TS4995 FlipChip

Vcc

Vo -

7

Vo+

+

5

8 Ohms

1uF

Cbyp as s1

VCC

3

STD BY

2

1

4

STDBY / Operation

STB Y

STDBY M ODE

9

3

4/24

GND

6

2

STDBY MODE

1

TS4995 Electrical characteristics

3 Electrical characteristics

Table 4. VCC = +5V, GND = 0V, T

Symbol Parameter Test conditions Min. Typ. Max. Unit

I

Supply Current No input signal, no load 4 7 mA

CC

I

STANDBY

Voo

Standby Current

Differential Output Offset
Voltage

Input Common Mode Voltage - 0 4.5 V

V

IC

Po Output Power THD = 1% Max, F= 1kHz, RL = 8Ω 0.8 1.2 W

= 25°C (unless otherwise specified)

amb

No input signal, Vstdby = V
No input signal, Vstdby = V

= GND, RL = 8Ω

SM

= VCC, RL = 8Ω

SM

10 1000 nA

No input signal, RL = 8Ω 0.1 10 mV

THD + N

PSRR

CMRR

SNR Signal-to-Noise Ratio

GBP Gain Bandwidth Product R

Total Harmonic Distortion +
Noise

Power Supply Rejection Ratio

IG

with Inputs Grounded

Common Mode Rejection
Ratio

V

Output Voltage Noise

N

(1)

Po = 850mW rms, 20Hz ≤ F ≤ 20kHz, RL = 8Ω 0.5 %

F = 217Hz, R = 8Ω, Cin = 4.7µF, Cb =1µF
Vripple = 200mV

F = 217Hz, RL = 8Ω, C
Vic = 200mV

PP

PP

= 4.7µF, Cb =1µF

in

75

(2)

90 dB

60 dB

A Weighted Filter

= 8Ω, THD +N < 0.7%, 20Hz ≤ F ≤ 20kHz 100

R

L

= 8Ω 2MHz

L

20Hz ≤ F ≤ 20kHz, R
Unweighted

A weighted
Unweighted, Standby
A weighted, Standby

= 8Ω

L

11

7

3.5

1.5

Zin Input impedance - 15 20 25 kΩ

- Gain mismatch - 5.5 6 6.5 dB

T

1. Dynamic measurements - 20*log(rms(Vout)/rms (Vripple)). Vripple is the super-imposed sinus signal relative to Vcc.

2. Guaranteed by design and evaluation.

3. Transition time from standby mode to fully operational amplifier.

WU

Wake-Up Time

(3)

Cb =1µF15mS

µV

dB

RM

S

5/24

Electrical characteristics TS4995

Table 5. VCC = +3.3V (all electrical values are guaranteed with correlation measurements at

2.6V and 5V), GND = 0V, T

Symbol Parameter Test conditions Min. Typ. Max. Unit

Supply Current No input signal, no load 3 7 mA

I

CC

I

STANDBY

Voo

THD + N

Standby Current

Differential Output Offset
Voltage

Input Common Mode Voltage - 0.4 2.3 V

V

IC

Po Output Power THD = 1% Max, F= 1kHz, RL = 8Ω 300 500 mW

Total Harmonic Distortion +
Noise

= 25°C (unless otherwise specified)

amb

No input signal, Vstdby = V
No input signal, Vstdby = V

= GND, RL = 8Ω

SM

= VCC, RL = 8Ω

SM

10 1000 nA

No input signal, RL = 8Ω 0.1 10 mV

Po = 300mW rms, 20Hz ≤ F ≤ 20kHz, RL = 8Ω 0.5 %

PSRR

CMRR

Power Supply Rejection Ratio

IG

with Inputs Grounded

Common Mode Rejection
Ratio

(1)

SNR Signal-to-Noise Ratio

GBP Gain Bandwidth Product R

V

Output Voltage Noise

N

F = 217Hz, R = 8Ω, Cin = 4.7µF, Cb =1µF
Vripple = 200mV

F = 217Hz, RL = 8Ω, C
Vic = 200mV

PP

PP

= 4.7µF, Cb =1µF

in

75

(2)

90 dB

60 dB

A Weighted Filter

RL = 8Ω, THD +N < 0.7%, 20Hz ≤ F ≤ 20kHz 100

= 8Ω 2MHz

L

20Hz ≤ F ≤ 20kHz, R
Unweighted

A weighted
Unweighted, Standby
A weighted, Standby

= 8Ω

L

11

7

3.5

1.5

Zin Input impedance - 15 20 25 kΩ

- Gain mismatch - 5.5 6 6.5 dB

T

1. Dynamic measurements - 20*log(rms(Vout)/rms (Vripple)). Vripple is the super-imposed sinus signal relative to Vcc.

2. Guaranteed by design and evaluation.

3. Transition time from standby mode to fully operational amplifier.

WU

Wake-Up Time

(3)

Cb =1µF10mS

µV

dB

RM

S

6/24

TS4995 Electrical characteristics

Table 6. VCC = +2.6V, GND = 0V, T

Symbol Parameter Test conditions Min. Typ. Max. Unit

Supply Current No input signal, no load 3 7 mA

I

CC

I

STANDBY

Voo

THD + N

Standby Current

Differential Output Offset
Voltage

Input Common Mode Voltage - 0.6 1.5 V

V

IC

Po Output Power THD = 1% Max, F= 1kHz, RL = 8Ω 200 300 mW

Total Harmonic Distortion +
Noise

= 25°C (unless otherwise specified)

amb

No input signal, Vstdby = V
No input signal, Vstdby = V

= GND, RL = 8Ω

SM

= VCC, RL = 8Ω

SM

10 1000 nA

No input signal, RL = 8Ω 0.1 10 mV

Po = 225mW rms, 20Hz ≤ F ≤ 20kHz, RL = 8Ω 0.5 %

PSRR

CMRR

Power Supply Rejection Ratio

IG

with Inputs Grounded

Common Mode Rejection
Ratio

(1)

SNR Signal-to-Noise Ratio

GBP Gain Bandwidth Product R

V

Output Voltage Noise

N

F = 217Hz, R = 8Ω, Cin = 4.7µF, Cb =1µF
Vripple = 200mV

F = 217Hz, RL = 8Ω, C
Vic = 200mV

PP

PP

= 4.7µF, Cb =1µF

in

75

(2)

90 dB

60 dB

A Weighted Filter

RL = 8Ω, THD +N < 0.7%, 20Hz ≤ F ≤ 20kHz 100

= 8Ω 2MHz

L

20Hz ≤ F ≤ 20kHz, R
Unweighted

A weighted
Unweighted, Standby
A weighted, Standby

= 8Ω

L

11

7

3.5

1.5

Zin Input impedance - 15 20 25 kΩ

- Gain mismatch - 5.5 6 6.5 dB

T

1. Dynamic measurements - 20*log(rms(Vout)/rms (Vripple)). Vripple is the super-imposed sinus signal relative to Vcc.

2. Guaranteed by design and evaluation.

3. Transition time from standby mode to fully operational amplifier.

WU

Wake-Up Time

(3)

Cb =1µF10mS

µV

dB

RM

S

7/24

Electrical characteristics TS4995

Figure 2. THD+N vs. output power Figure 3. THD+N vs. output power

10

RL = 8

Ω

G = 6dB
F = 20Hz
Cb = 1µF
BW < 125kHz

1

Tamb = 25°C

0.1

THD + N (%)

0.01
1E-3 0.01 0.1 1

Output power (W)

Vcc=5V

Vcc=3.3V

Vcc=2.6V

10

RL = 8

Ω

G = 6dB
F = 20Hz
Cb = 0
BW < 125kHz

1

Tamb = 25°C

0.1

THD + N (%)

0.01
1E-3 0.01 0.1 1

Output power (W)

Vcc=5V

Vcc=3.3V

Vcc=2.6V

Figure 4. THD+N vs. output power Figure 5. THD+N vs. output power

THD + N (%)

0.1

10

RL = 16
G = 6dB
F = 20Hz
Cb = 1µF
BW < 125kHz

1

Tamb = 25°C

Ω

Vcc=5V

Vcc=3.3V

Vcc=2.6V

10

THD + N (%)

0.1

RL = 16
G = 6dB
F = 20Hz
Cb = 0
BW < 125kHz

1

Tamb = 25°C

Ω

Vcc=5V

Vcc=3.3V

Vcc=2.6V

0.01
1E-3 0.01 0.1 1

Output power (W)

0.01
1E-3 0.01 0.1 1

Output power (W)

Figure 6. THD+N vs. output power Figure 7. THD+N vs. output power

10

RL = 8

Ω

G = 6dB
F = 1kHz
Cb = 1µF
BW < 125kHz

1

Tamb = 25°C

0.1

THD + N (%)

0.01
1E-3 0.01 0.1 1

Output power (W)

Vcc=5V

Vcc=3.3V

Vcc=2.6V

10

RL = 8

Ω

G = 6dB
F = 1kHz
Cb = 0
BW < 125kHz

1

Tamb = 25°C

0.1

THD + N (%)

0.01
1E-3 0.01 0.1 1

Output power (W)

Vcc=5V

Vcc=3.3V

Vcc=2.6V

8/24