MC145745 Datasheet, PDF (6/16 Pages) Motorola, Inc – V.21/V.23 TELEMETER MODEM

DTMF TRANSMIT CHARACTERISTICS
Characteristic
Symbol
Tone Output Level
Low Group
Vfl
High Group
Vfh
High Group Pre–Emphasis
PE
DTMF Distortion
DIST
DTMF Frequency Deviation
∆fV
Out–of–Band Level
Setup Time
VOE
tosc
Conditions
Transmit Attenuator = 0 dB
RTLA = 0 Ω
fosc = 3.579545 MHz
Single Tone Mode
RL = 1.2 kΩ
VTxA1 – VTxA2
DTMF RECEIVER CHARACTERISTICS
Characteristic
Symbol
Conditions
Input Resistance
Detection Signal Level (Each Tone)
BR3 = (0, 0, 1, 0)
Twist (High/Low Group)
Frequency Detection Band Width
(Figure 3)
Frequency Non–Detection Band Width
(Figure 3)
DTMF Detection Timing
(Figure 2)
OFF to ON TDVON CD1 = 0 , CD0 = 0
Delay
CD1 = 0 , CD0 = 1
CD1 = 1 , CD0 = 0
ON to OFF TDVOFF CD1 = 0 , CD0 = 0
Delay
CD1 = 0 , CD0 = 1
CD1 = 1 , CD0 = 0
Min
Typ
Max
—
0
—
—
1
—
0
—
3
—
5
—
–1
—
1
Refer to Figure 1
—
4
—
Min
Typ
50
500
– 48
—
– 10
—
1.5% + 2 Hz
—
– 1.5% – 2Hz
—
—
—
—
30
—
35
—
45
—
25
—
35
—
25
Max
—
0
10
—
—
± 3.5%
—
—
—
—
—
—
DEMODULATOR CHARACTERISTICS
Characteristic
Symbol
Conditions
V.21 Bit Bias
Receive Level = – 24 dBm
S/N = 4 dB
V.23 Bit Bias
Receive Level = – 24 dBm
S/N = 14 dB
V.21 Bit Error Rate
Receive Level = – 24 dBm
S/N = 4 dB
511–Bit Pattern
V.23 Bit Error Rate
Receive Level = – 24 dBm
S/N = 14 dB
511–Bit Pattern
Min
Typ
Max
—
5
—
—
10
—
—
0.00001
—
—
0.00001
—
Unit
dBm
dBm
dB
%
%
dB
ms
Unit
kΩ
dBm
dB
ms
Unit
%
%
MC145745
6
MOTOROLA