SM8224B Просмотр технического описания (PDF) - Nippon Precision Circuits
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SM8224B Datasheet PDF : 11 Pages
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SM8224B
PIN DESCRIPTION
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Name
AGND
TIP
RING
TRQ
GND
OSCIN
OSCOUT
MODE
TEST
DOUT
STR
DTDET
CR
CDET
VDD
S1
S0
DTQ
DT2
DT1
I/O
Function
O Analog ground output. Internal reference voltage (VD D /2) output level
I Tip input. Connected to the telephone line through a protection circuit
I Ring input. Connected to the telephone line through a protection circuit
O Input-stage amplifier gain-select output. Used to adjust the gain of the input-stage amplifier.
– Ground. Connected to the system ground potential.
I Cr ystal oscillator input. The crystal oscillator element is connected between this pin and OSCOUT.
O Crystal oscillator output.The crystal oscillator element is connected between this pin and OSCIN.
I When MODE is HIGH, and S1 and S0 are both LOW , the device is in pow er-down state. See table 2.
– TEST pin. Set OPEN when normal using.
O Data output. Demodulated FSK signal output. HIGH level output when CDET goes HIGH.
Dual-tone confirmation output. Function is selected by S0 and S1. See table 2.
O Dual-tone confirmation: Active-LOW output when dual tone detection signal passes through RC time
constant delay circuit.
O Dual-tone detector output. HIGH-level output when dual tone is detected.
I/O
Dual tone RC time constant circuit connection. The dual tone detection signal passes through the RC
network to generate the STR signal.
O FSK signal carrier detector output. LOW -level when active carrier is detected.
– Supply
I Function select bit 1. Selects the device mode in combination with S0 and MODE. See table 2.
I Function select bit 1. Selects the device mode in combination with S1 and MODE. See table 2.
O Dual-tone signal input-stage amplifier output. Used to adjust the gain of the input-stage amplifier.
I Dual-tone signal input-stage operational amplifier inverting input
I Dual-tone signal input-stage operational amplifier non-inverting input
NIPPON PRECISION CIRCUITS—4
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