ASAHI KASEI [AK2305]
C0029-E-02 1 1999/8
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 - 4.096MHz)
-
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)
PACKAGE
- 48LQFP
9.0 x 9.0 mm (0.5mm pin pitch)
ASAHI KASEI [AK2305]
C0029-E-02 2 1999/8
CONTENTS
ITEMS PAGE
- BLOCK DIAGRAM............................................. 3
- PIN ASSIGNMENT............................................. 4
- PIN CONDITION................................................ 5
- PIN FUNCTION................................................. 6
- CIRCUIT DESCRIPTION...................................... 8
- FUNCTIONAL DESCRIPTION.............................. 9
- PCM INTERFACE...................................... 9
LONGFRAME/SHORTFRAME................ 10
GCI.................................................... 12
IDL..................................................... 13
RESET............................................... 14
- POWER DOWN........................................ 15
- MUTE.................................................... 17
- GAIN ADJUSTMENT................................. 18
- DTMF RECEIVER.................................... 19
- TONE GENERATOR................................. 21
- AUX INPUT............................................. 21
- SERIAL INTERFACE................................ 22
- REGISTER....................................................... 25
- ABSOLUTE MAXIMUM RATINGS......................... 28
- RECOMMENDED OPERATING CONDITIONS........ 28
- ELECTRICAL CHARACTERISTICS....................... 28
- APPLICATION CIRCUIT EXAMPLE.......................39
- PACKAGE INFORMATION.................................. 42
PDF 
ZIP
