AC ELECTRICAL CHARACTERISTICS
(VCC = + 3.6 V ± 0.3 V, TA = – 30 to + 85_C)
TRANSMIT CARRIER CHARACTERISTICS
Characteristic
Symbol
V.21 Carrier Frequency
Originate Mode
V.21 Carrier Frequency
Answer Mode
V.23 Carrier Frequency
Mark “1”
f1M
Space “0” f1S
Mark “1”
f2M
Space “0” f2S
Mark “1”
f1M
Space “0” f1S
Transmit Carrier Level
VO
Secondary Harmonic Level
V2h
Out–of–Band Level
VOE
Conditions
Oscillation Frequency:
3.579545 MHz (X2)
or 7.159090 MHz (ECLK)
Transmit Attenuator = 0 dB
RTLA = 0, RL = 1.2 kΩ
VTxA1 – VTxA2
Min
974
1174
1644
1844
1294
2094
—
—
Typ
980
1180
1650
1850
1300
2100
4
– 40
Refer to Figure 1
Max
986
1186
1656
1856
1306
2106
—
—
TRANSMIT ATTENUATOR CHARACTERISTICS
Characteristic
Symbol
Attenuation Range
Attenuator Accuracy
1 – 5 dB
6 – 9 dB
10 – 15 dB
Conditions
Min
Typ
Max
0
—
15
– 0.5
—
0.5
–1
—
1
– 1.7
—
1
RECEIVER CHARACTERISTICS (Includes Hybrid, Demodulator, and Carrier Detector)
Characteristic
Symbol
Conditions
Min
Typ
Max
Input Resistance
RIRX
50
500
—
Receive Carrier Amplitude
VIRX
– 48
—
– 12
Carrier Detection
Threshold
OFF to ON
ON to OFF
Hysteresis (VCDON – VCDOFF)
VCDON
VCDOFF
HYS
CDA = 1.25 V
fin = 1.0 kHz
BR3 (b1) = 1
—
– 44
—
—
– 47
—
2
—
—
Carrier Detection Timing OFF to ON TCDON CD1 = 0, CD0 = 0, CD Pin
—
450
—
CD1 = 0, CD0 = 1, CD Pin
—
15
—
CD1 = 1, CD0 = 0, CD Pin
—
15
—
CD1 = 1, CD0 = 1, CD Pin
—
75
—
ON to OFF TCDOFF CD1 = 0, CD0 = 0, CD Pin
—
30
—
CD1 = 0, CD0 = 1, CD Pin
—
30
—
CD1 = 1, CD0 = 0, CD Pin
—
15
—
CD1 = 1, CD0 = 1, CD Pin
—
10
—
CPTD CHARACTERISTICS
Characteristic
Symbol
Conditions
BPF Center Frequency
BPF Pass–Band Lower Cut–Off
Frequency
fc
fi
– 3 dB
BPF Pass–Band Upper Cut–Off
Frequency
fh
– 3 dB
CPT Detection Level
CPT Detection Timing
VTD ON
VTD OFF
TTD ON
TTD OFF
VTDON
VTDOFF
TTDON
TTDOFF
CDA = 1.25 V
fin = 400 Hz
BR3 (b1) = 1
Min
Typ
Max
—
400
—
—
330
—
—
470
—
—
– 44
—
—
– 47
—
—
10
—
—
25
—
Unit
Hz
dBm
dB
dBm
Unit
dB
dB
Unit
kΩ
dBm
dBm
dB
ms
Unit
Hz
Hz
Hz
dBm
ms
MOTOROLA
MC145745
5