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I.
GENERAL DESCRIPTION
This is a new version of Call Waiting service decoder on the telephone. Call Waiting service works by alerting
a customer engaged in a telephone call to a new incoming call. This way the customer can still receive important
calls while engaged in a current call. The Call Waiting decoder can detect dual tone (2130Hz and 2750Hz) alert
signal and generate a valid signal on the data pins for micro controller.
II.
FEATURES
• Compatible with Bellcore special report SR-TSV-002476
• 3.6V ~ 6.0V supply voltage
• Call-Waiting (2130Hz plus 2750Hz) Alert Signal Detector
• Good talkdown and talkoff performance
• Sensitivity compensated by adjusting input OP gain
• Package series --- 14-pin DIP or 16-pin SOP (150 mil)
AG8889AP for 14-pin DIP
AG8889N for 16-pin SOP (150 mil)
III. APPLICATION
• Feature phones
• Cordless phones
• Adjunct unit (stand alone)
IV. PIN CONFIGURATION
TIP
RING
OPO
VREF
NC
PWD
VSS
* This specification are subject to be changed without notice.
AG8889AP
VDD
1
14
DO
2
13
NC
3
12
NC
4
11
10
NC
5
OSCI
6
9
OSCO
7
8
CALL WAITING DECODER
AG8889N
TIP
VDD
1
16
RING
DO
2
15
OPO
NC
3
14
VREF
NC
4
13
NC
12
NC
5
PWD
OSCI
6
11
VSS
OSCO
7
10
NC
NC
8
9
AG8889
8.8.2000
1
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Related Manuals for Elan AG8889
Summary of Contents for Elan AG8889
- Page 1 AG8889 CALL WAITING DECODER GENERAL DESCRIPTION This is a new version of Call Waiting service decoder on the telephone. Call Waiting service works by alerting a customer engaged in a telephone call to a new incoming call. This way the customer can still receive important calls while engaged in a current call.
- Page 2 AG8889 CALL WAITING DECODER FUNCTIONAL BLOCK DIAGRAM Tone Detection Block RING Filter Vdd/2 Voltage VREF Clock Reference Generator OSCI OSCO VI. PIN DESCRIPTIONS Description Tip in should be connected with twisted pair RING Ring in should be connected with twisted pair...
- Page 3 AG8889 CALL WAITING DECODER DC CHARACTERISTIC VDD=5V, Vss=0V, Ta=25°C, fOSC=3.58MHz Sym. Description Condition Min. Typ. Max. Unit operating supply voltage operating supply current low level input voltage high level input voltage low level output voltage load=1mA high level output voltage load=1mA Note: 1.both tones in the composite signal have equal amplitude.
- Page 4 AG8889 CALL WAITING DECODER WAVE FORM TIMING DO timing: alert tone (~80ms) off hook line event normal on hook engaged call Tinvd Tfvd Tfinvd Tvd=Tfvd+Tdvd Tdvd Tdinvd Tinvd=Tfinvd+Tdinvd OSC timing: power off power on Power on/off Tosc Tosc OSC off...
- Page 5 AG8889 CALL WAITING DECODER APPLICATION CIRCUIT 1 When PWD pin (pin 6) is controlled by MCU or external hook detect circuit, the users can use the following application. (pin6 is connected to control pin of MCU or hook detect output) VDD 14 0.1u...
- Page 6 AG8889 CALL WAITING DECODER APPLICATION CIRCUIT 2 In some application, the call waiting decoder is always powered on , the PWD pin (pin 6) can not be directly connected to the ground, the users have to use the following application. (pin6 is connected with a capacitor to VDD and connected with a resistor to the ground).
- Page 7 AG8889 CALL WAITING DECODER APPLICATION NOTE 1. VDD, GND To reduce noise effects, separate the analog and digital systems close to the device. For both the digital and analog VDD pins, use a ceramic capacitor of about 0.1uF set as close as possible to the pin to bypass to the respective GND's.
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