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SM8224 数据表(PDF) 9 Page - Nippon Precision Circuits Inc

部件名 SM8224
功能描述  Dual-Tone Receiver IC
Download  11 Pages
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制造商  NPC [Nippon Precision Circuits Inc]
网页  http://www.npc.co.jp/en
标志 NPC - Nippon Precision Circuits Inc

SM8224 数据表(HTML) 9 Page - Nippon Precision Circuits Inc

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SM8224B
NIPPON PRECISION CIRCUITS—9
FUNCTIONAL DESCRIPTION
The SM8224B receiver with caller ID service con-
forms to the Bellcore standards. It incorporates FSK
demodulator and dual-tone detection functions in a
single chip. It has a dedicated dual-tone signal input
so that the FSK signal input amplification and dual-
tone signal input amplification can be set indepen-
dently. This allows systems can be easily constructed
that provide pre- and mid-conversation information
services.
FSK Demodulator
Calling number identification service is sent as an
FSK signal, and the SM8224B FSK demodulator
processes this signal.
The FSK signal conforms to the following Bellcore
standard.
Note: S1, S0, MODE setting should be used from above combination except Test mode.
Dual Tone Detector
When using mid-conversation information services,
2 mixed signals of 2130Hz and 2750Hz are sent on
lines L1 and L2. The SM8224B detects the 2 signals
from the background noise. It uses 2 separate high-
order filters with center frequencies of 2130Hz and
2750Hz to detect the presence of the signal frequen-
cies.
In series with the filters are level detectors. When the
input level exceeds the preset rating, the signal is
detected. When the input level is below the rating,
the signal is not detected.
If both the 2130Hz and 2750Hz signals are simulta-
neously detected, DTDET goes HIGH and starts
charging the time constant circuit comprised by an
external capacitor and external resistor. When the
time constant circuit voltage rises above a fixed volt-
age level, STR signal goes LOW to indicate dual
tone detection.
Table 1. FSK signal
P arameter
Description
Modulation type
Continuous-phase binar y frequency-shift-
keying
Logic “1” data (mark)
1200 ± 12 Hz
Logic “0” data (space)
2200 ± 22 Hz
Signal level (mark)
−32 to −12 dBm
Signal level (space)
−36 to −12 dBm
Data transfer rate
1200 ± 12 baud
Table 2. Function select
S 1
S 0
MODE
Function
S T R
L O W
L O W
HIGH
P ow er-dow n
HIGH
HIGH
L O W
L O W
Dual-tone detection from DT1/DT21
L O W (dual tone confirmation)
L O W
HIGH
L O W
FSK and dual-tone detection from TIP/RING
L O W (dual tone confirmation)
HIGH
HIGH
L O W
FSK detection from TIP/RING
HIGH
L O W
L O W
L O W
Test mode2
1. DT1, DT2, DTQ are active in this mode only.
2. Test mode should not be used.


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