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PDF TS4890 Data sheet ( Hoja de datos )
| Número de pieza | TS4890 | |
| Descripción | RAIL TO RAIL OUTPUT 1W AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE LOW | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TS4890 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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TS4890
RAIL TO RAIL OUTPUT 1W AUDIO POWER AMPLIFIER WITH
STANDBY MODE ACTIVE LOW
s OPERATING FROM VCC = 2.2V to 5.5V
s 1W RAI L TO RAIL OUTPUT POWER @
Vcc=5V, THD=1%, f=1kHz, with 8Ω Load
s ULTRA LOW CONSUMPTION IN STANDBY
MODE (10nA)
s 75dB PSRR @ 217Hz from 5 to 2.2V
s POP & CLICK REDUCTION CIRCUITRY
s ULTRA LOW DISTORTION (0.1%)
s UNITY GAIN STABLE
s AVAILABLE IN SO8, MiniSO8 & DFN8
DESCRIPTION
The TS4890 (MiniSO8 & SO8) is an Audio Power
Amplifier capable of delivering 1W of continuous
RMS. ouput power into 8Ω load @ 5V.
This Audio Amplifier is exhibiting 0.1% distortion
level (THD) from a 5V supply for a Pout = 250mW
RMS. An external standby mode control reduces
the supply current to less than 10nA. An internal
thermal shutdown protection is also provided.
The TS4890 have been designed for high quality
audio applications such as mobile phones and to
minimize the number of external components.
The unity-gain stable amplifier can be configured
by external gain setting resistors.
PIN CONNECTIONS (Top View)
TS4890ID, TS4890IDT - SO8
Standby
Bypass
VIN+
VIN-
1
2
3
4
8 VOUT2
7 GND
6 VCC
5 VOUT1
TS4890IST - MiniSO8
Standby
Bypass
VIN+
VIN-
1
2
3
4
8 VOUT2
7 GND
6 VCC
5 VOUT1
TS4890IQT - DFN8
STANDBY 1
BYPASS 2
VIN+ 3
VIN- 4
8 VOUT 2
7 GND
6 Vcc
5 VOUT 1
APPLICATIONS
s Mobile Phones (Cellular / Cordless)
s Laptop / Notebook Computers
s PDAs
s Portable Audio Devices
ORDER CODE
Part
Number
TS4890
Temperature
Range
-40, +85°C
Package
S DQ
•
•
•
Marking
4890I
4890
4890
MiniSO & DFN only available in Tape & Reel: with T suffix.
SO is available in Tube (D) and of Tape & Reel (DT)
June 2003
TYPICAL APPLICATION SCHEMATIC
Audio
Input
Rin
Cin
Cfeed
Rfeed Vcc
6
4 Vin- -
3 Vin+ +
Vcc
2 Bypass
1 Standby
Bias
Rstb
Cb
7
Cs
Vout1 5
-
Av=-1
+
Vout2 8
RL
8 Ohms
TS4890
1/32
1 page  
TS4890
Components
Functional Description
Rin
Cin
Rfeed
Cs
Cb
Cfeed
Rstb
Gv
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))
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))
Pull-down resistor which fixes the right supply level on the standby pin
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 = 100µF.
1. External resistors are not needed for having better stability when supply @ Vcc down to 3V. The
quiescent current still remains the same.
2. The standby response time is about 1µs.
5/32
5 Page 
Fig. 31 : THD + N vs Output Power
10
RL = 4Ω, Vcc = 2.2V
Gv = 2
Cb = Cin = 1µF
BW < 125kHz
Tamb = 25°C
1
20kHz
20Hz, 1kHz
0.1
1E-3
0.01 0.1
Output Power (W)
Fig. 33 : THD + N vs Output Power
10
RL = 8Ω
Vcc = 5V
Gv = 2
Cb = Cin = 1µF
BW < 125kHz
1 Tamb = 25°C
20Hz, 1kHz
20kHz
0.1
1E-3
0.01 0.1
Output Power (W)
1
Fig. 35 : THD + N vs Output Power
10
RL = 8Ω, Vcc = 3.3V
Gv = 2
Cb = Cin = 1µF
BW < 125kHz
Tamb = 25°C
1
20Hz, 1kHz
20kHz
0.1
1E-3
0.01 0.1
Output Power (W)
1
TS4890
Fig. 32 : THD + N vs Output Power
10
RL = 4Ω, Vcc = 2.2V
Gv = 10
Cb = Cin = 1µF
BW < 125kHz
Tamb = 25°C
1
20kHz
0.1 1kHz
1E-3
20Hz
0.01 0.1
Output Power (W)
Fig. 34 : THD + N vs Output Power
10
RL = 8Ω
Vcc = 5V
Gv = 10
Cb = Cin = 1µF
BW < 125kHz
1 Tamb = 25°C
20Hz
20kHz
0.1
1kHz
1E-3
0.01 0.1
Output Power (W)
1
Fig. 36 : THD + N vs Output Power
10
RL = 8Ω, Vcc = 3.3V
Gv = 10
Cb = Cin = 1µF
BW < 125kHz
Tamb = 25°C
1
20Hz
20kHz
0.1
1kHz
1E-3
0.01 0.1
Output Power (W)
1
11/32
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TS4890.PDF ] | |
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