msm7512b Oki Semiconductor, msm7512b Datasheet - Page 7

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

Demodulator analog input (Al, EAI) characteristics
Receive Signal
Amplitude
Receive Signal
Detect Amplitude (CD)
Hysteresis (CD)
CD Delay Time
CD Hold Time
Receive Data (RD)
Bias Distortion
Input Resistance
AI
CD
Parameter
*
Semiconductor
0 dBm = 0.775 Vrms
Symbol
V
V
t
t
R
V
D
R
V
CDD
CDH
HYS
OFF
ON
EAI
BS
AI
AI
t
CDD
Figure 1 Carrier Detect (CD) Timing
FSK Signal, (1:1) at AI
1200 bps, 1:1 Pattern
FSK Signal, at AI
V
Condition
See Fig. 1
ON
EAI
Æ V
AI
OFF
OFF Æ OFF
( V
OFF Æ ON
DD
= +2.7 V to +5.5 V, Top = –40°C to +85°C)
t
CDH
Min.
–48
–10
—
—
—
20
—
20
5
Typ.
—
—
—
15
40
—
10
—
2
MSM7512B
Max. Unit
–42
–6
—
—
20
60
10
—
—
dBm
dBm
dBm
MW
7/12
ms
ms
kW
dB
%