TS4990JT View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TS4990JT' PDF : 6 Pages View PDF
TS4990
ELECTRICAL CHARACTERISTICS
VCC = 2.6V, GND = 0V, Tamb = 25°C (unless otherwise specified)
Symbol
Parameter
Min. Typ.
ICC
Supply Current
No input signal, no load
4
ISTANDBY
Standby Current 1)
No input signal, Vstdby = GND, RL = 8Ω
10
Voo
Output Offset Voltage
No input signal, RL = 8Ω
5
Po
Output Power
THD = 1% Max, f = 1kHz, RL = 8Ω
210 260
THD + N
Total Harmonic Distortion + Noise
Po = 200mW rms, Gv = 2, 20Hz < f < 20kHz, RL = 8Ω
0.15
PSRR
Power Supply Rejection Ratio2)
RL = 8Ω, Gv = 2, Vripple = 200mVpp, Input Grounded
F = 217Hz
F = 1kHz
55
62
55
66
TWU Wake-Up Time
130
1. Standby mode is actived when Vstdby is tied to Vcc
2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the surimposed sinus signal to Vcc.
Max.
6
1000
20
TBD
Unit
mA
nA
mV
mW
%
dB
ms
Components
Functional Description
Rin
Cin
Rfeed
Cs
Cb
Cfeed
Gv
Inverting input resistor which sets the closed loop gain in conjunction with Rfeed. This resistor also
form a high pass filter with Cin (fc = 1 / (2 x Pi x Rin x Cin))
Input coupling capacitor which blocks the DC voltage at the amplifier input terminal
Feed back resistor which sets the closed loop gain in conjunction with Rin
Supply Bypass capacitor which provides power supply filtering
Bypass pin capacitor which provides half supply filtering
Low pass filter capacitor allowing to cut the high frequency (low pass filter cut-off frequency
1 / (2 x Pi x Rfeed x Cfeed))
Closed loop gain in BTL configuration = 2 x (Rfeed / Rin)
REMARKS
1. All measurements, except PSRR measurements, are made with a supply bypass capacitor Cs = 1µF.
2. The standby response time is about 1µs.
4/6
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