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SM8224 Folha de dados(PDF) 4 Page - Nippon Precision Circuits Inc

Nome de Peças SM8224
Descrição Electrónicos  Dual-Tone Receiver IC
Download  11 Pages
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Fabricante Electrônico  NPC [Nippon Precision Circuits Inc]
Página de início  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM8224 Folha de dados(HTML) 4 Page - Nippon Precision Circuits Inc

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SM8224B
NIPPON PRECISION CIRCUITS—4
PIN DESCRIPTION
Number
Name
I/O
Function
1
A G N D
O
Analog ground output. Internal reference voltage (VDD /2) output level
2
TIP
I
Tip input. Connected to the telephone line through a protection circuit
3
RING
I
Ring input. Connected to the telephone line through a protection circuit
4
T R Q
O
Input-stage amplifier gain-select output. Used to adjust the gain of the input-stage amplifier.
5
G N D
Ground. Connected to the system ground potential.
6
OSCIN
I
Cr ystal oscillator input. The cr ystal oscillator element is connected between this pin and OSCOUT.
7
OSCOUT
O
Cr ystal oscillator output. The cr ystal oscillator element is connected between this pin and OSCIN.
8
MODE
I
When MODE is HIGH, and S1 and S0 are both LOW , the device is in pow er-down state. See table 2.
9
TEST
TEST pin. Set OPEN when nor mal using.
1 0
DOUT
O
Data output. Demodulated FSK signal output. HIGH level output when CDET goes HIGH.
1 1
STR
O
Dual-tone confirmation output. Function is selected by S0 and S1. See table 2.
Dual-tone confirmation: Active-LOW output when dual tone detection signal passes through RC time
constant delay circuit.
1 2
DTDET
O
Dual-tone detector output. HIGH-level output when dual tone is detected.
1 3
C R
I/O
Dual tone RC time constant circuit connection. The dual tone detection signal passes through the RC
network to generate the S T R signal.
1 4
CDET
O
FSK signal carrier detector output. L OW -level when active carrier is detected.
1 5
V D D
Supply
1 6
S 1
I
Function select bit 1. Selects the device mode in combination with S0 and MODE. See table 2.
1 7
S 0
I
Function select bit 1. Selects the device mode in combination with S1 and MODE. See table 2.
1 8
D T Q
O
Dual-tone signal input-stage amplifier output. Used to adjust the gain of the input-stage amplifier.
1 9
D T 2
I
Dual-tone signal input-stage operational amplifier inverting input
2 0
D T 1
I
Dual-tone signal input-stage operational amplifier non-inverting input


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