msm7512b Oki Semiconductor, msm7512b Datasheet - Page 4

• Manufacturer Part Number: msm7512b
• Description: 1200 Bps Half Duplex Fsk Modem ? Itu-t V.2
• Manufacturer: Oki Semiconductor

PIN DESCRIPTION
Note :
RS GS-VK
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
No.
Semiconductor
10
12
13
15
17
18
19
20
22
24
1
3
5
6
7
8
I* : Internally pulled-up input pin.
Name
MOD1
MOD2
TEST
GND
AOG
CLK
V
EAI
AO
RD
CD
XD
RS
X1
X2
AI
DD
I/O
—
—
I*
I*
I*
I*
I*
I*
O
O
O
O
O
I
I
I
+3 V to +5 V Power Supply
Analog receive signal input.
Analog transmit signal output.
External analog signal input.
The signal applied to this pin is transmitted from AO via transmit output
amplifier. When not using this pin, it should be left open.
Ground, 0 V.
3.579545 MHz crystal resonator should be connected to X1 and X2.
When applying external clock 3.579545 MHz to the device, it should be
applied to X2 (not X1) via an AC-coupling capacitor of 100 pF and X1
has to be opened.
3.579545 MHz clock signal output.
Modem receive serial data output.
Digital "1" and "0" correspond to "Mark" and "Space", respectively. When
CD (Carrier Detect) is off, RD is held at "Mark" state.
FSK Receive signal and answer tone detect.
Digital "0" and "1" represent "Detect" and "Non-detect", respectively.
Modem transmit serial data input.
Digital "1" and "0" correspond to "Mark" and "Space", respectively.
FSK signal and answer tone transmit enable.
When digital "0" is applied to RS, transmitting becomes enable.
Chip test input.
TEST should be open or digital "1".
Operation mode select.
Refer to Table 1.
Analog transmit signal amplitude select.
Digital "1" Æ –10 dBm Typ. at AO
Digital "0" Æ –4 dBm Typ. at AO
Description
MSM7512B
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