MSM6926 Datasheet, PDF (10/25 Pages) OKI electronic componets – 300 bps Single Chip FSK MODEM

¡ Semiconductor
MSM6926/6946
Analog Interface Characteristics
1. MSM6926
Transmit carrier out (A_O)
Parameter
ORIGINATE MODE
Carrier Frequency
ANSWER MODE
Carrier Frequency
Output Resistance
Load Resistance
Load Capacitance
Transmit Level
Symbol
Mark
1
f_OM
Space
0
f_OS
Mark
1
f_AM
Space
0
f_AS
R_OXA
R_LXA
C_LXA
V_OXA
Output Offset Voltage
V_OSX
Out-of-Band Energy
(Referred to Carrier Level)
E_OX
(V_A = 12 V ±10%, V_D = 5 V ±5%, Ta = 0 to 70°C)
Condition
Min. Typ. Max. Unit
974 980
986
f_CRYSTAL = 3.579545 MHz
1174
1644
1180
1650
1186
Hz
1656
—
—
—
—
—
C₁ = 0.047 mF
1844 1850 1856
—
—
200 W
50
—
— kW
—
—
100 pF
4
6
8 *1 dBm
V_A
2
–1
V_A
2
V_A
2
+1
V
Refer to Fig. 1
dB
Receive carrier input (A_IN)
Parameter
Symbol
Input Resistance
R_IRA
Receive Signal Level Range
V_IRA
Carrier Detect Level
ON V_CD ON
OFF V_CD OFF
Carrier Detect Hysteresis
H_YS
Condition
—
—
R₈ = 33 kW *2
R₉ = 51 kW
V_CD ON – V_CD OFF
Min.
100
–48
—
–48
2
Typ.
—
—
—
—
—
Max. Unit
— kW
–6
–43 *1 dBm
—
—
dB
Receive filter
Parameter
Group Delay Distortion
Adjacent Channel Rejection
Symbol
Condition
ORIG. _{1600 to 1900 Hz}
MODE
D_DL
ANS.
MODE
930 to 1230 Hz
L_AC
V_AIN = –6 dBm
Notes: *1 0 dBm = 0.775 Vrms
*2 The resistor values are typical
Min.
—
—
50
Typ.
800
850
—
Max. Unit
—
ms
—
—
dB
10/25