AK2306 Datasheet, PDF (35/38 Pages) Asahi Kasei Microsystems – Dual PCM CODEC for ISDN/VoIP TERMINAL ADAPTER

ASAHI KASEI
[AK2306/LV]
Analog output circuit(AMPR0,1)
AK2306/LV has an op-amp at analog output stage of each channel to consist in an inverting amplifier for a gain
adjustment of 0dBm0 level. Feedback resistor must be 10kohm or larger.
R1
R1=R2=33kohm
R2
AK2306
GSRn
VFRn
BGREF
(n=0,1)
VRn
GAnR
! Important Notice
When AMPRn are used as a AGND buffer, they can not be used for a gain adjustment.
Analog ground stabilization capacitor
An external capacitor of more than 1.0uF should be connected between VREF and VSS to stabilize analog
ground (VREF).
AK2306/LV
C
VREF
+
PLL Loop filter capcitor
An external capacitor of more than 0.22uF should be connected between LPC and VSS.
AK2306/LV
C
LPC
+
Power Supply
To attenuate the power supply noise, connect capacitors between VDD and VSS, as shown below.
AK2306/LV
VDD
C1
VSS
+
C2
C1=C3=0.1uF
C2=C4=10uF
MS0093-E-04
35
2001/11