EMC AG8889AP Call waiting decoder Datasheet

AG8889
CALL WAITING DECODER
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
AG8889AP
AG8889N
TIP
1
14
VDD
RING
2
13
OPO
3
VREF
TIP
1
16
VDD
DO
RING
2
15
DO
12
NC
OPO
3
14
NC
4
11
NC
VREF
4
13
NC
NC
5
10
NC
NC
5
12
NC
PWD
6
9
OSCI
PWD
6
11
OSCI
VSS
7
8
OSCO
VSS
7
10
OSCO
NC
8
9
* This specification are subject to be changed without notice.
NC
8.8.2000
1
AG8889
CALL WAITING DECODER
V.
FUNCTIONAL BLOCK DIAGRAM
OPO
TIP
Tone
RING
VREF
DO
Detection Block
Filter
Vdd/2
Voltage
Reference
Clock
Generator
OSCI OSCO
PWD
VI. PIN DESCRIPTIONS
Pin
TIP
RING
OPO
VREF
PWD
I/O
I
I
O
OSCI
OSCO
DO
I
O
O
VDD
GND
NC
I
Description
Tip in should be connected with twisted pair
Ring in should be connected with twisted pair
Output of OP Amp
Reference voltage Vref = 1/2 Vdd
This pin is normal low enabling chip on normal operation and ready to detect CAS
tone signals.
This active high input sets the chip into power down mode and disable oscillator to
save power.
3.58MHz oscillator in
3.58MHz oscillator out
DO : used as output, this pin determines whether DO signal is valid or not. High is
valid. Normal low.
Power
Ground
Non connected
VII. FUNCTIONAL DESCRIPTIONS
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
CAS(Call-Waiting Alerting Signal 2130Hz plus 2750Hz) and generate a valid signal on the data pin.
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 three blocks, including differential amplifier, tone filter detection block
In a typical application, this IC receives Tip and Ring signals from twisted pairs. The signals as inputs of differential
amplifier, and the differential amplifier sends input signal to a band pass tone filter. Once the signal is filtered, the
digital detection block decodes the information. The output data made available at DO pin.
This IC is used for detecting CAS signals. Once the signal is detected, the detection indication is shown on the data
output DO pin. The DO pin is normal low. When this IC detects 2130Hz and 2750Hz frequency at the same time, then
DO pin goes to high.
* This specification are subject to be changed without notice.
2
8.8.2000
AG8889
CALL WAITING DECODER
DC CHARACTERISTIC
VDD=5V, Vss=0V, Ta=25°C, fOSC=3.58MHz
Sym.
VDD
Description
operating supply voltage
IDD
VIL
operating supply current
low level input voltage
VIH
VOL
high level input voltage
low level output voltage
Condition
Min.
3.6
Typ.
Max.
6
Unit
V
3.3
5
1.5
mA
V
3.5
load=1mA
VOH
high level output voltage
load=1mA
Note: 1.both tones in the composite signal have equal amplitude.
0.4
V
V
4.6
V
2.tone pair is deviated by 0.5%.
3.addes a 0.1uf capacitor between Power and Ground.
AC ELECTRICAL CHARACTERISTIC
(VDD=+5V,Ta=+25°C)
CHARACTERISTIC
Input sensitivity TIP and RING pins ,Vdd=+5V, Input G=1
Input frequency tolerance for 2130Hz
Input frequency tolerance for 2750Hz
* This specification are subject to be changed without notice.
Min.
Typ.
-38
±1.2
±1.2
Max.
Unit
dBm
%
%
8.8.2000
3
AG8889
CALL WAITING DECODER
WAVE FORM TIMING
DO timing:
line event normal on hook
off hook
engaged call
alert
tone
(~80ms)
Tvd
Tinvd
Tfinvd
CAS
Tvd=Tfvd+Tdvd
Tinvd=Tfinvd+Tdinvd
Tfvd
Tdvd
Tdinvd
OSC timing:
power off
power on
Power
on/off
PWD
Tosc
OSC off
Tosc
OSCI
OSC off
OSC on
(OSCO)
Sym.
Tfvd
Tfinvd
Tdvd
Tdinvd
Tvd
Tinvd
alert
tone
Tosc
Description
filter output signal valid delay
filter output signal invalid delay
digital delay of valid signal
digital delay of invalid signal
total delay of valid signal
total delay of invalid signal
input alert tone length
(2130 ,2750 Hz @ -20dBm )
Oscillator enable delay time
Min.
Typ.
6
6
36
20
42
26
80
Max.
Unit
ms
ms
ms
ms
ms
ms
ms
10
ms
Note: detected alert tone length shown above is assumed that no speech signals input.
test under alert tone signal = -22dBm (600Ω)
* This specification are subject to be changed without notice.
8.8.2000
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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)
5V
5V
3 OPO
0.01u
250V
430k
39k
470k
VDD 14
0.1u
47p
TIP
1 TIP
39k
2 RING
RING
62k
0.01u
250V
430k
DO 13
PWD 6
51k
4 VREF OSCI 9
OSCO
7 GND
8
C1
33p
Y1
3.58MHz
C2
33p
Note :
Y1
KYOCERA
KBR-3.58MSB202
C1
33p
C2
33p
KBR-3.58MSB202 tolerrance :
-0.10% ~+0.15%
* This specification are subject to be changed without notice.
8-bit
MCU
8.8.2000
5
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).
5V
5V
3 OPO
0.01u
250V
430k
39k
470k
VD
14
D
0.1u
47p
TIP
1 TIP
5V
39k
2 RING
RING
62k
0.01u
250V
430k
470p
DO 13
PWD 6
51k
4 VREF OSCI 9
OSCO
7
GN
D
8
C1
33p
Y1
3.58MHz
C2
33p
20k
Note :
Y1
KYOCERA
KBR-3.58MSB202
C1
33p
C2
33p
KBR-3.58MSB202 tolerrance :
-0.10% ~+0.15%
* This specification are subject to be changed without notice.
8-bit
MCU
8.8.2000
6
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.
2. PWD pin
By connecting PWD pin to GND, normal mode is obtained. In the normal mode, the oscillator is activated then
ready to decode CAS signal and the chip consumes operating current. By connecting PWD pin to VDD, the
chip is on power down mode and the chip consumes just stand-by current.
3. OPO pin
This pin is the gain adjustment of internal OP Amp.
4. XIN, XOUT pins
If the resonator is used, two capacitors about 33pF and 1M( resistor have to be connected for frequency
accuracy.
* This specification are subject to be changed without notice.
8.8.2000
7
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