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PDF AN6215S Data sheet ( Hoja de datos )
| Número de pieza | AN6215S | |
| Descripción | AGC IC for telephone speech network | |
| Fabricantes | Panasonic Semiconductor | |
| Logotipo |  |
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ICs for Telephone
AN6215S
AGC IC for telephone speech network
s Overview
The AN6215S is an AGC IC for telephone speech
network, and it incorporates an microphone input detec-
tion circuit and a receiver gain control circuit. It is espe-
cially best suited for cordless telephone thanks to a good
speech tone quality obtained by reducing howling and echo
sound.
s Features
• Operation with wide power supply voltage range from
2.1 V to 6.0 V
• Enlargement of dynamic range by incorporating a vari-
able VREF circuit that varies according to the supply
voltage
• Possible to adjust the received voice attenuation amount
with an external resistor
• Possible to adjust the AGC operating point with an ex-
ternal resistor
• Possible to design with fewer external components
Unit: mm
18
27
36
45
0.3
4.2 ± 0.3
6.5 ± 0.3
SOP008-P-0225A
s Block Diagram
VREF
Det.
CC Buff
1
1 page  
ICs for Telephone
AN6215S
s Application Circuit Example
• System configuration
• Detects input of microphone and gives attenuation to a receiver system
• Operating point and variable width of attenuator can be set with external resistor respectively.
T
Circuit
R I/F
Speech amp.
Microphone
amp.
C4
Microphone
VCSW
VCC
R1
R3
C3
• Characteristics
RX out
VREF
Det.
CC
GND
R2
Receiver amp.
BN
C1
VCSW: VREF control switch
SW on: VREF = 2.0 V
SW off: VREF = 1.15 V
Buff R1: Detection circuit gain adjustment resistor
R2: Receiver ∆Gain width adjustment resistor
R3, C3: Resistor and capacitor to determine
attack-recovery time of transmitter
C2
Receiver amp.
∆Gain = − 8 dB
(R2 = 68 kΩ)
RX out
Inclination: ∆R = − 0.6 dB/dB
TX in
Figure 1. Variable width of attenuation
−39 dBm
(R1 = 10 kΩ)
TX in
Figure 2. Operating point of attenuation
VREF (V)
2.0
VRB (Base-set mode)
1.15 VRH (Hand-set mode)
0.3 VDET Reference voltage
VCC
Figure 3. Operation of variable VREF circuit
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet AN6215S.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AN6215S | AGC IC for telephone speech network | Panasonic Semiconductor |
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