AG8888 Ver la hoja de datos (PDF) - ELAN Microelectronics
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AG8888 Datasheet PDF : 7 Pages
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AG8888
CALL WAITING DECODER
V. FUNCTIONAL BLOCK DIAGRAM
OPO
BO FI
TI/RI
Buffer
Tone
DO
Filter
Detection Block
Vdd/2
OE
OSCI
OSCO
Clock
Generator
Voltage
Reference
VI. PIN DESCRIPTIONS
Pin
I/O
Description
TI/RI
I
Tip in or Ring in should be connected with twisted pair
OE
I
Output enable for alert tone detected. High is enable. Low is for factory test.
OSCI
I
480KHz crystal in
OSCO
O
480KHz crystal out
DO
O
Alert tone detected output. Normal low.
Under OE pin set to high, when call waiting alert tone is detected, this pin goes to high.
OPO
O
Output of OP Amp
BO
O
Internal buffer output
FI
I
Band pass filer input
AVDD
Analog power.
DVDD
Digital power.
AVSS
Analog Ground.
DVSS
Digital Ground.
NC
Non connected
VII. FUNCTIONAL DESCRIPTIONS
Call Waiting service works by alerting a customer engaged in a telephone call to a new incoming call. Thus, the
customer can still receive important calls while engaged in a current call. The call waiting decoder can detect alert
tone (Call-Waiting Alerting Signal 2130Hz plus 2750Hz) and generate a valid timing on the data pins.
The call waiting decoder is designed to support the Caller Number Deliver feature, which is offered by regional
Bell Operating Companies. The call waiting decoder has four blocks, including OP Amp, band pass filter, and
detection block.
In a typical application, this IC receives Tip/Ring signals from twisted pairs. The signals as inputs of single-ended
pre-amplifier (OP Amp and Buffer Amp), and the amplifier sends input signal to a band pass filter. Once the
* This specification are subject to be changed without notice.
8.8.2000 2
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