Datasheet

  
   
SLOS018H − MAY 1988 − REVISED NOVEMBER 2004
21
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
typical applications
5 V
100 pF
2 kΩ
Q4
2N2222
Q3
2N2905
5 V
68 Ω
4.3 kΩ
LT1004
1.2 V
4 kΩ
†
10 kΩ
†
1 kΩ
4-mA
Trim
IN
0 to 4 V
4 mA to 20 mA
to Load
2.2 kΩ Max
100 Ω
†
10 kΩ
†
10 kΩ
†
20-mA Trim
100 kΩ
5 V
0.33 µF
10 kΩ 10 kΩ 820 Ω
Q2
2N2905
SN74HC04 (6)
820 Ω
Q1
2N2905
1N4002 (4)
10 µF
10 µF
T1
‡
0.002 µF
1/2
LT1013
1/2
LT1013
80 kΩ
†
+
−
+
−
+
+
†
1% film resistor. Match 10-kΩ resistors to within 0.05%.
‡
T1 = PICO-31080
Figure 30. 5-V 4-mA to 20-mA Current-Loop Transmitter With 12-Bit Accuracy