TS4871

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ELECTRICAL CHARACTERISTICS

REMARKS

1. All measurements, except PSRR measurements, are made with a supply bypass capacitor Cs = 100µF.

2. External resistors are not needed for having better stability when supply @ Vcc down to 3V. By the way,

the quiescent current remains the same.

3. The standby response time is about 1µs.

Symbol

Parameter

Min.

Typ.

Max.

Unit

Supply Current

No input signal, no load

5.5

8

mA

No input signal, Vstdby = Vcc, RL = 8

Ω

1. Standby mode is actived when Vstdby is tied to Vcc

10

1000

nA

Voo

Output Offset Voltage

No input signal, RL = 8

Ω

520

mV

Po

Output Power

THD = 1% Max, f = 1kHz, RL = 8

Ω

260

mW

THD + N

Total Harmonic Distortion + Noise

Po = 200mW rms, Gv = 2, 20Hz < f < 20kHz, RL = 8

Ω

0.15

%

PSRR

f = 217Hz, RL = 8

Ω, RFeed = 22KΩ, Vripple = 200mV rms

2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the surimposed sinus signal to Vcc @ f = 217Hz

75

dB

Φ

M

Phase Margin at Unity Gain

70

Degrees

GM

Gain Margin

20

dB

GBP

Gain Bandwidth Product

2MHz

Components

Functional Description

Rin

Inverting input resistor which sets the closed loop gain in conjunction with Rfeed. This resistor also

forms a high pass filter with Cin (fc = 1 / (2 x Pi x Rin x Cin))

Cin

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

Rfeed

Feed back resistor which sets the closed loop gain in conjunction with Rin

Cs

Supply Bypass capacitor which provides power supply filtering

Cb

Bypass pin capacitor which provides half supply filtering

Cfeed

Low pass filter capacitor allowing to cut the high frequency

(low pass filter cut-off frequency 1 / (2 x Pi x Rfeed x Cfeed))

Rstb

Pull-up resistor which fixes the right supply level on the standby pin

Gv

Closed loop gain in BTL configuration = 2 x (Rfeed / Rin)