AK2306 Datasheet, PDF (34/38 Pages) Asahi Kasei Microsystems – Dual PCM CODEC for ISDN/VoIP TERMINAL ADAPTER

ASAHI KASEI
[AK2306/LV]
APPLICATION CIRCUIT EXAMPLE
Analog input circuit(AMPT0,1)
AK2306/LV has an op-amp at analog input of each channel. Each op-amp can be used as a gain adjustment.
Op-amp can be used as an inverting amplifier or differential input buffer with AMPRn as VREF buffer . Feedback
resistor must be 10k ohm or larger.
Single End buffer
R2
C1 R1
AK2306
GSXn
VFXn
(n=0,1)
C1=0.47uF
R1=R2=33kohm
more than
1.0uF
AMPTn
BGREF
Differential buffer
R2
C1 R1
GSXn
VFXn
(n=0,1)
R1
R2
C1=0.47uF
R1=R2=33kohm
AMPTn
AMPRn
BGREF
! Important Notice
Please use AMPRn as a AGND buffer to avoid a cross talk between TX and RX, channel1 and channel2
when TX input is composed as a differential input.
MS0093-E-04
34
2001/11