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PDF EM92547D Data sheet ( Hoja de datos )
| Número de pieza | EM92547D | |
| Descripción | CALLER ID FSK DECODER | |
| Fabricantes | ELAN Microelectronics Corp | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de EM92547D (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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ELAN MICROELECTRONICS CORPORATION
EM92547A/B/D
CALLER ID FSK DECODER
ELAN MICROELECTRONICS CORP.
Office :
6-F1.,42, Sec.2, Chung Shaan N.
Road.,
Taipei, Taiwan, R.O.C.
TEL : (02) 5628813 EXT.686,687;5223065
FAX : (02) 5516348
TELEX : 21540 HTC, 22486 EHSIN
7F-1, No. 9 Prosperity 1st Rd.
Science-Based Industrial Park. Hsin Chu
City.
Taiwan, R.O.C.
TEL : (03) 5787505
FAX : (03) 5779095
Publication Release Date :
Agent :
1 page  
EM92547A/B/D
CALLER ID FSK DECODER
A /PWR UP input pin is provided to activate the chip regardless of the presence of a
power ring signal. If /PWR UP is sent high, the IC can still power itself up whenever it
detects a valid ring signal, but will back to its normal power-down mode after a time period.
The input buffer accepts a differential AC coupled input signal through the TIP and
RING input and feeds this signal to a band pass filter. Once the signal is filtered, the FSK
demodulator decodes the information and sents it to a post filter. The output data is then
made available at DATA OUT pin. This data, as sent by the central office, includes the
header information (alternate "1" and "0") and 150msec of marking which precedes the date,
time and calling number. If no data is present, the DATA OUT pin is held in a low state.
This is accomplished by a carrier detect circuit which determines if the in-band energy is
high enough. If the incoming signal is valid and thus the demodulated data is transferred to
DATA OUT pin. If it is not, then the FSK demodulator is blocked. This device uses a 3.58
MHz crystal or a 455KHz(for EM92547A only) resonator as a timing source for all the
internal blocks.
* Ring detect circuit
When Vdd is applied to the circuit, the RC network will charge cap C1 to Vdd
/PWR UP
VDD R1 /Ring Time
C1
(form bridge) R2 Ring det1
Power Up
Logic
R3
Ring det2
R4 1.2V
Ring
Counter
/RD
holding /RING TIME off. If /PWRUP is also held at Vdd, the whole circuit will be in a
power down mode, and will consume less than 1uA of supply current. The resistor network
R2 to R4 attenuates the incoming power ring applied to the top of R2. The values given
have been chosen to provide a sufficient voltage at pin3, to turn on the Schmitt trigger input.
When Vt+ of the Schmitt is exceeded, cap C1 will discharge. This will initialize a partial
power up, and enable the ring detect circuit.
The value of R1 and C1 must be chosen to hold the /RING TIME pin voltage below
the Vt+ of the Schmitt between the individual cycle of the power ring. The values shown
will work for ring frequencies of 15.3 Hz minimum.
________________________________________________________________________________________________________________________________________________________
* This specification are subject to be changed without notice.
1998
~4~
5 Page 
EM92547A/B/D
CALLER ID FSK DECODER
Application Circuit
EM92547A :
4700p
4700p
TIP
0.1u
250V
RING
0.1u
250V
30k
30k
470k
18k
Vdd 0.1uF
EM92547A
Tip 1
Ring 2
Ring det1 3
Ring det2 4
/Ring time 6
NC 5
/PWR UP 7
Vdd VSS 8
16 Vdd
14 DATA OUT
13 /CD
12 /RD
47k
11 CLK SELECT Vdd
10 OSCIN
9 OSCOUT
47k
270k
0.22u
15k
8-bit MCU
1M 33p
3.58M
33p
LCD
DISPLAY
EM92547B :
TIP
RING
4700p
4700p
0.1u
250V
0.1u
250V
30k
30k
470k
18k
Vdd 0.1uF
EM92547B
Tip 1
Ring 2
Ring det1 3
Ring det2 4
/Ring time 6
NC 5
/PWR UP 7
Vdd VSS 8
16 Vdd
14 DATA OUT
13 /CD
12 /RD
11 NC
10 OSCIN
9 OSCOUT
47k
47k
270k
0.22u
15k
8-bit MCU
1M 33p
3.58M
33p
LCD
DISPLAY
________________________________________________________________________________________________________________________________________________________
* This specification are subject to be changed without notice.
1998
~ 10 ~
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet EM92547D.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| EM92547A | CALLER ID FSK DECODER | ELAN Microelectronics Corp |
| EM92547B | CALLER ID FSK DECODER | ELAN Microelectronics Corp |
| EM92547D | CALLER ID FSK DECODER | ELAN Microelectronics Corp |
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