AK2308LV_05 Datasheet, PDF (1/31 Pages) Asahi Kasei Microsystems – SPEECH CODEC for Digital Key telephone

ASAHI KASEI
[AK2308LV]
AK2308LV
SPEECH CODEC for Digital Key telephone
GENERAL DISCREPTION
AK2308LV is an integrated LSI with PCM CODEC,
Voice path control, MIC amplifier and Handset driver
suitable for PBX/KTS digital key telephone, VoIP
Telephone Analog Interface.
PCM CODEC is compliant to ITU G.711 G.712
specification, very low noise, and low power
dissipation CODEC. A-law and u-law selectable
through Serial I/F register. PCM I/F provides
Long/Short frame format. The output is 8bit
compressed data along with 16bit linear format. FS
must be 8kHz clock that is synchronized with BCLK.
Voice path block consists of TX analog inputs, output
for handset receiver, output for the hands-free
speaker, volume for the TX and RX respectively, and
the path control switches. Side tone can be added
internally and its volume is controlled through serial
CPU I/F.
FEATURES
- 2 MIC AMP for the handset and microphone are
integrated.
- Differential driver for the 32ohm speaker and 10k
ohm driver for the handset receiver.
- Path control and volume control via serial CPU
I/F
- 3.3V+/-0.3V single power supply
- Low noise, low power consumption
Package
30pin VSOP package
- Package size; 9.7*7.6mm(pin to pin)
- Pin pitch;
0.65mm
BLOCK DIAGRAM
HANDT3
HANDT1
HANDT2
MIC3
MIC1
MIC2
DAOUT
Amp1
Amp2
RAI
+5～+11dB
Amp4
RAO
SW3
SPI
0dB
SPOP
32Ω Amp5
SW1 ^0dB
SW2
Amp3
SW5
VOL1
Rx Analog Vol
+12～-12dB
2dB step
SPON
32Ω Amp6
HANDI
HANDR
10KΩ
Amp7
0dB
VOL3
+6/0/-6dB
-11dB
SW7
VOL2
Rx Analog Vol
+8～-18dB
2dB step
SW4
-25dB
SW6
Tx Digital vol Linear
A/D
PAD
0/-14dB
+15～-16dB
1dB step
↓
A/μ
Side Tone Att
-12～-57dB
3dB Step
D/A ₊
CODEC
RX Digital vol Linear
+15～-16dB ↑
1dB step A/μ
PCM I/F
A/u-law
16bit Linear
DX
DR
FS
BCLK
Power
0dB
PLL
CPU I/F
PLLCAP
CSN
SCLK
DATA
MS0227-E-01
1
2005/12