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TS4973IJT

1.2W Two Audio Inputs With Gain Control Power Amplifier with Standby Mode Active Low

STMicroelectronics 

Electrical Characteristics

TS4973

Table 5: Electrical characteristics - VCC = 2.8V, GND = 0V, Tamb = 25°C (unless otherwise

specified)

Symbol

Parameter

Min. Typ. Max. Unit

Total Harmonic Distortion + Noise

THD + N Po = 250mW rms, GS = Low (Av = 2)

20Hz < F < 20kHz, RL = 8Ω

0.5

%

PSRR

Power Supply Rejection Ratio1

F = 217Hz, RL = 8Ω, GS = Low (Av = 2)

Vripple = 200mVpp, Input Grounded, Cin = 220nF, Cb = 1µF

53

dB

PSRR

Power Supply Rejection Ratio2

F = 217Hz, RL = 8Ω, GS = Low (Av = 2)

Vripple = 200mVpp, Input Floating, Cb = 1µF

68

dB

Zin

Input Impedance

GS = Low (Av = 2)

37.5

50

62.5

KΩ

Rfeed

roduct(s) VN

Internal Feedback Resistor

Output Voltage Noise F = 20Hz to 20kHz, RL = 8Ω

Unweighted, Vstdby = Gnd

A weighted, Vstdby = Gnd

Unweighted, GS = Low (Av = 2)

A weighted, GS = Low (Av = 2)

Unweighted, GS = High (Av = 10)

A weighted, GS = High (Av = 10)

37.5

50

62.5

6

2.5

23

15

56

40

P 1) Dynamic measurements - 20*log(rms(Vout)/rms (Vripple)). Vripple is an added sinus signal to Vcc @ F = 217Hz

te 2) Dynamic measurements - 20*log(rms(Vout)/rms (Vripple)). Vripple is an added sinus signal to Vcc @ F = 217Hz

le Table 6: Application Components Information

KΩ

µVRMS

so Components

Functional Description

- Ob Rin

t(s) Cin1

uc Cin2

rod Cs

te P Cb

sole Av

Inverting input resistor which sets the closed loop gain (when GS = high) in conjunction with the inter-

nal feedback resistor Rfeed. This resistor also forms a high pass filter with Cin1

Fc = 1 / (2 x Pi x Rin x Cin1)

Input coupling capacitor which blocks the DC voltage at the amplifier input terminal In1

Input coupling capacitor which blocks the DC voltage at the amplifier input terminal In2. This capacitor

also forms a high pass filter with Zin (internal input impedance when Gs = Low

Fc = 1 / (2 x Pi x Zin x Cin2)

Supply Bypass capacitor which provides power supply filtering (Recommended value = 1µF)

Bypass pin capacitor which provides half supply filtering (Recommended value = 1µF)

Closed loop gain in BTL configuration

When Gs = Low, Av = 2 or 6dB

When GS = high, Av = 2 x (Rfeed / Rin). Rfeed value see Electrical Characteristics.

ObRemarks:

1. All measurements, except PSRR measurements, are made with a supply bypass capacitor Cs = 1µF.

2. The standby response time is about 1µs.

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