ASAHI
KASEI
[AK2305]
AK2305
Dual PCM CODEC for ISDN TERMINAL ADAPTER
GENERAL DESCRIPTION
AK2305 is a dual PCM CODEC-Filter most
suitable for ISDN Terminal Adapter. A-law/u-
law is selected by the internal register.
In addition to CODEC, this device has dual
DTMF receiver and External Tone Input pin.
Input/output operational amplifiers included in
this device are used for transmit/receive gain
adjustment. AK2305 has internal volume control
to attenuate signal from 0dB to –12dB by 3dB
step control which is defined by an internal
register written through the serial interface.
PCM interface of AK2305 accepts several clock
formats, which are Long Frame, Short Frame,
GCI, IDL. 64k-4096kHz clock input is available
for PCM interface.
-
-
-
-
FEATURE
Dual PCM CODEC and Filtering systems for
ISDN Terminal Adapter
Dual DTMF Receiver
External Tone Input(AUX)
Independent functions on each channel
- Frame Sync Signal(8kHz)
- Power Down Mode(Pin/Register operation)
- Mute(Pin/Register operation)
- Gain Adjustment: 0 to -12dB (3dB step)
Selectable PCM Data Interface Timing:
Long Frame / Short Frame / GCI / IDL
Variable PCM Data Rate:
64k x N [Hz] (64k - 4.096 M H z)
Operational Amplifier for Gain Adjustment
A-law/u-law Register Selectable
Serial Interface
Power on Reset
Single +5V ± 5% CMOS technology
Low Power Consumption (85mW typ)
-
-
-
-
-
-
-
-
PACKAGE
- 48LQFP
9.0 x 9.0 mm (0.5mm pin pitch)
C0029-E-02
1
1999/8
AKM [ ASAHI KASEI MICROSYSTEMS ]
