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Am79231 Data Sheet
13
ELECTRICAL CHARACTERISTICS
Power Dissipation
Loop resistance = 0 to
∞ unless otherwise noted (not including fuse resistors), 2 x 50 Ω fuse resistors,
BATL = –36 V, BATH = –65 V, VCC = +5 V. For power dissipation measurements, DC-feed conditions
are as follows:
ILA (Active mode current limit) = 25 mA (IRSN = 50
µA)
RFD (Feed resistance) = 500
Ω
VAS (Anti-sat activate voltage) = 10 V
VAPP (Apparent Battery Voltage) = 48 V
RTMG1 = RTMG2 (Thermal management resistors) = 1 k
Ω
Description
Test Conditions
Min
Typ
Max
Unit
Power Dissipation
Normal Polarity
On-Hook Disconnect
50
mW
On-Hook Standby
65
On-Hook Transmission
ISLIC
Fixed Longitudinal Voltage
145
On-Hook Active High Battery
ISLIC
270
Off-Hook Active Low Battery
ISLIC
RL = 294
Ω
TMG
620
200
Power Supply Currents
On-Hook Disconnect
VBH
VBL
VCC
0.5
0.1
3.1
mA
On-Hook Standby
VBH
VBL
VCC
0.75
0
3.1
On-Hook Transmission
VBH
Fixed Longitudinal Voltage
VBL
VCC
1.85
0
5
On-Hook Active High Battery
VBH
VBL
VCC
3.6
0
7.3
Off-Hook Active Low Battery
VBH
RL = 294
Ω
VBL
VCC
.7
26.9
7.5
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