0.7
VEE = – 28 V
0.6
TA = 25°C
VDD = + 5.0 V
0.5
RRF = 3900
0.4
RRF = 6200
0.3
RRF = 10 k
0.2
0
200
400
600
800
RL, LOOP RESISTANCE (Ω)
Figure 23. IC Power Dissipation versus
Loop Resistance and RRF
0.4
0.3
6.2 k
0.2
10 k
VEE = – 28 V
TA = 25°C
RP = 100 Ω
0.1
RRF = 3.9 k
0
0
200
400
600
800
RL, LOOP RESISTANCE (Ω)
Figure 24. Transistor Power Dissipation
versus Loop Resistance and RRF
50
40
30
RS = 5.1 k
20
RS = 11 k
10
– 42 V ≤ VEE ≤ – 24 V
f = 60 Hz AND 1.0 kHz
CT > 0.1 µF FOR 1.0 kHz
0
CT > 1.0 µF FOR 60 Hz
20
30
40
IL, LOOP CURRENT (mA)
Figure 25. Maximum Longitudinal Current
versus Loop Current
20
16
RT = 200 k
f = 1.0 kHz
12
8.0
RT = 20 k
f = 1.0 kHz
4.0
0
0.1
ST2
RT
VEE = – 28 V
TA = 25°C
CT IL = 20 mA
RS = 9.1 k
RT = 200 k
f = 60 Hz
RT = 20 k
f = 60 Hz
1.0
10
CT (µF)
Figure 26. Maximum Longitudinal Current
versus CT, RT and Frequency
MOTOROLA
MC33121
11