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PDF CF8223A Data sheet ( Hoja de datos )
| Número de pieza | CF8223A | |
| Descripción | FSK Decoder and DTMF Receiver IC | |
| Fabricantes | Nippon Precision Circuits Inc | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CF8223A (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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NIPPON PRECISION CIRCUITS INC.
SM8223A
FSK Decoder and DTMF Receiver IC
OVERVIEW
The SM8223A is a FSK (Frequency shift keying) decoder and DTMF (Dual tone multi-frequency) receiver IC.
It is fabricated using a CMOS process and features a power-down function for low power dissipation opera-
tion. The FSK decoder and DTMF receiver have the same performance characteristics as dedicated ICs that
perform the same functions, with the added benefit of an FSK decoder/DTMF receiver auto-select function1
using the telephone tip/ring input signal. It also features a ring (call signal) signal detection circuit, making for
easy construction of low power dissipation, high-performance analog telephone-related applications.
FEATURES
s Both FSK signal caller-ID information services
and DTMF signal caller-ID information services
supported
s FSK decoder/DTMF receiver auto-select function
s Ring (call signal) signal detection circuit built-in
s Serial I/O
s Input gain adjustment circuit built-in
s Power-down mode
s Single supply operation: 3.0V ± 10%
s 3.579545MHz external crystal oscillator fre-
quency
s Molybdenum-gate CMOS process
APPLICATIONS
s Telephones, fax machines and modems that sup-
port caller-ID information services
s Adapters for caller-ID information service func-
tions
s Telephones, fax machines and modems that sup-
port remote operation functions
ORDERING INFORMATION
Device
SM8223A
CF8223A
Package
16-pin DIP
Chip
PINOUT
(Top view)
TIP
RING
GS
AGND
RDIN
RDRC
RDET
PDWN
1
8
PINOUT
(Unit: µm)
RING TIP
GS
AGND
RDIN
16 VDD
DV
DOUT
FSK/DTMF
IC
OSCIN
OSCOUT
9 GND
VDD
DV
(2810, 3160)
DOUT
FSK/DTMF
IC
RDRC
OSCIN
(0, 0)
RDET PDWN
GND OSCOUT
P ad size : 90µm × 90µm
1. Auto-select function operates if the FSK signal conforms to the Bellcore GR-30-CORE standard.
NIPPON PRECISION CIRCUITS—1
1 page  
SM8223A
AC Electrical Characteristics
FSK decoder
VDD = 3.0V ± 0.3V, GND = 0V, fCLK = 3.579545MHz, Ta = −20 to 85°C unless otherwise noted.
Parameter
Detection sensitivity
Noise reduction ratio
Symbol
Condition
Typical application circuit
M a r k signal and SPA CE
signal are same level.
Noise: Random noise from
200Hz to 3400Hz.
min
−4 0
20
Rating
typ
−3 7 . 5
–
max
0
–
DTMF receiver
VDD = 3.0V ± 0.3V, GND = 0V, fCLK = 3.579545MHz, Ta = −20 to 85°C unless otherwise noted.
Parameter
Detection frequency deviation
Non-detection frequency deviation
Detection sensitivity
Non-detection sensitivity
Signal level error
High-frequency rejection ratio
Noise rejection ratio
Dial tone rejection ratio
1. Input signal is up to V D D level.
Symbol
Condition
Typical application circuit
Typical application circuit1
min
±1.5% ± 2
±3.5
−3 2 . 0
–
–
–
–
–
Rating
typ
–
–
–
–
–
18
12
20
max
–
–
0.0
−5 0 . 0
6
–
–
–
Input-stage amplifier Characteristics
VDD = 3.0V ± 0.3V, GND = 0V, fCLK = 3.579545MHz, Ta = −20 to 85°C unless otherwise noted.
Parameter
Input leakage current
Input resistance
DC open-loop voltage gain
Unity gain frequency
Load capacitance
Load resistance
Symbol
IIN
R IN
AVOL
fC
CL
RL
Condition
Rating
min typ max
––1
–1–
30 –
–
80 –
–
– – 100
50 –
–
Unit
dBm
dB
Unit
Hz
%
dBm
dBm
dB
dB
dB
dB
Unit
µA
MΩ
dB
kHz
pF
kΩ
NIPPON PRECISION CIRCUITS—5
5 Page 
SM8223A
Input Differential Amplifier
The SM8223A uses an input differential amplifier
for input gain adjustment of the tip/ring signal input
to the FSK detector or DTMF receiver. Differential
input configuration and single-ended input configu-
ration circuits are shown in figure 3. A bypass capac-
itor should be connected between GND and AGND
in both circuit configurations.
C1 R1
C1 R1
R3
TIP
RING
R2 GS
R4 AGND
C
Differntial Input
C1 R1
TIP
RING
R2 GS
AGND
Single-Ended Input
C
Figure 3. Input circuits
The gain for single-ended configurations is given by
the following equation.
AV
=
-R---2--
R1
and the input impedance is given by the following
equation.
Zi = 2
R12
+
ω-----1C----1-
2
The gain for differential configurations is given by
the following equation,
AV
=
-R---2--
R1
where
R3=
----R---2----R---4-----
R2 + R4
FSK/DTMF Auto-discriminator
The SM8223A examines the tip/ring input signal and
determines the nature of the signal, FSK or DTMF,
and invokes the corresponding circuits, FSK decoder
or DTMF receiver, respectively. It determines
whether the input signal is an FSK signal or DTMF
signal by the presence or otherwise of the channel
seizure information in the FSK signal header. This
function automatically discriminates between the
input signals if the FSK signal conforms to the
Bellcore GR-30-CORE standard.
NIPPON PRECISION CIRCUITS—11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet CF8223A.PDF ] | |
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