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.

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 - 4.096MHz)
- 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)