AK2305 Datasheet, PDF (39/43 Pages) Asahi Kasei Microsystems – Dual PCM CODEC for ISDN TERMINAL ADAPTER

ASAHI KASEI
APPLICATION CIRCUIT EXAMPLE
[AK2305]
Analog input circuit(AMPT0,1)
AK2305 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. Feedback resistor must be 10kΩ or larger.
R2
C1 R1
AK2305
GSXn
VFXn
(n=0,1)
C1=0.47uF
R1=R2=33kOhm
BGREF
Analog output circuit(AMPR0,1)
AK2305 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. Feedback resistor must be 10kΩ or larger.
R1=R2=33kOhm ^R1
AK2305
GSRn
VFRn
BGREF
(n=0,1)
R2
VRXn
SMFn
AUX INPUT
An external tone is input to AUX through an external capacitance of more than 0.1uF.
AK2305
C
AUX
C0029-E-02
39
1999/8