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PDF TA2123AF Data sheet ( Hoja de datos )
| Número de pieza | TA2123AF | |
| Descripción | 1.5V Stereo Headphone Amplifier | |
| Fabricantes | Toshiba Semiconductor | |
| Logotipo |  |
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TOSHIBA Bipolar Integrated Circuit Silicon Monolithic
TA2123AF
1.5V Stereo Headphone Amplifier
TA2123AF
The TA2123AF is the system amplifier IC which is developed
for playback stereo headphone equipments. It is built in dual
auto−reverse preamplifiers, dual power amplifiers with bass /
treble boost function, AMS (automatic music sensor) function,
beep function, AGC for power amplifier etc.
Features
· Power amplifier stage
· In case of output coupling type, the supply current
decreases.
(built−in center amplifier switch)
Weight: 0.17g (typ.)
· Built−in bass boost function
· Built−in treble boost function
· Built−in power amplifier muting function
· Built−in input terminal for beep signal
· Built−in input capacitor for reducing buzz noise
· GV = 24dB (typ.)
· Built−in AGC circuit (in case of boost mode, this circuit operates.)
· Low supply current
(VCC = 1.3V, f = 1kHz, RL = 32Ω, Ta = 25°C, typ.)
No Signal 0.1mW × 2 0.5mW × 2
Output coupling type
OCL type
1.5mA
2.2mA
3.0mA
4.9mA
5.0mA
8.6mA
· Preamplifier stage
· Auto-reverse compatible
· Built-in input capacitor for reducing buzz noise
· Input coupling condensor-less
· Built-in metal mode drivers
· Preamplifier muting function
· Built-in ripple filter circuit
· Built-in AMS (automatic music sensor) function (mixer amplifier and level comparator)
· Built-in power switch
· Operating supply voltage range (Ta = 25°C)
VCC (opr) = 0.95~2.2V
1 2002-10-30
1 page  
TA2123AF
Terminal
No. Name
Function
31 LPF
Low pass filter terminal of bass boost
Internal Circuit
20kΩ
PW IN
20kΩ
10kΩ
10kΩ VREF OUT
31
Terminal
Voltage
(V)
0.73
33 BST OUT
34 BST NF
35 AGC IN
Output of boost amplifier
NF of boost amplifier
Input of boost AGC circuit
・The input level to the boost
amplifier is controlled by the input
level of this terminal.
・Input impedance: 10kΩ (typ.)
OUTC
VREF OUT
20kΩ
33
100kΩ
34
VREF OUT
- + 35
10kΩ
VREF OUT
0.73
0.73
0.73
36 DET
Smoothing terminal of boost AGC
circuit
36
—
37
C-AMP
SW
38 MT TC
Center amplifier on / off switch
・Output type of power amplifier
OCL type: OPEN
(C-AMP ON)
Output coupling type: GND
(C-AMP OFF)
Smoothing terminal of MT SW
In order to reduce a pop noise at
power amplifier on / off switching
Center amplifier
37
38
—
0.7
5 2002-10-30
5 Page 
TA2123AF
The transfer function of bass boost is as follows from Fig.4.
G (ω) = G1 (ω)･A1･G2 (ω)･G3 (ω)･A2
The bass boost effect is changed by external resistor or external capacitor. The transfer function and cut
off frequency are as follows.
(1) Transfer function of LPF
G1 (ω) = 1 / (1 + jωC1･R1)
fL = 1 / 2πC1･R1
(2) Transfer function of BPF
G3 (ω) = jωC4･R5 / [1 + jω (R4･C3 + R5･C3 + C4･R4) - ω2 R4･C3･R5･C4]
fO = 1/ 2p R4 × C3 × R5 × C4
(3) HPF gain and cut off frequency
G2 (ω) = 1 + R2 / (R3 + 1 / jωC2)
30
HPF
fHC = 1 / (2 F R3･C2)
20
10 Total characteristic
Ra
Ca
A
Rb
Cb
0
−10
BPF
fO
−20
fL
LPF
Fig.5 BPF
−30
3
10
100 300
Frequency f (Hz)
Graph.1 Characteristic of bass boost
(4) fO and fL
The fL and fO should be set up out of the audio frequency range. In case that the fO and fL is inside
of audio frequency range and AGC circuit operates, the voltage gain decrease.
(5) HPF
The fHC should be made 1 / 2 or less frequency as compared with the fL or fO. The phase difference
is large near the fHC, so that the bass boost level runs short. And the HPF gain of middle or high
frequency range should be set to 10dB or more.
11 2002-10-30
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet TA2123AF.PDF ] | |
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