AMP01
+15V
COMPLIANCE, TYPICALLY ؎10V
LINEARITY ~0.01%
OUTPUT RESISTANCE AT 20mA ~5M⍀
0.047F
POWER BANDWIDTH (–3dB) ~60kHz
18
1
INTO 500⍀ LOAD
+IN
R
TRIM
OUT
12
V+
13
10
SENSE
7
R2
200⍀
R
R
G
R1
100⍀
9
R
2k⍀
G
؎I
OUT
AMP01
V
IN
8
2
3
REFERENCE
G
V–
11
R
S
15
–IN
S
R
I
= V
IN
S
OUT
(
)
R
G
14
0.047F
R1 = 100⍀ FOR I
= ؎20mA
OUT
–15V
R
S
V
= ؎100mV FOR ؎20mA FULL SCALE
IN
2k⍀
Figure 36. High Compliance Bipolar Current Source with 13-Bit Linearity
ALL RESISTORS 1% METAL FILM
+15V
TO +30V
R
2k⍀
S
0.047F
14
R
S
18
1
15
+IN
R3
100⍀
R
12
V+
S
13
10
R2
200⍀
R
R
G
2
7
8
R
TRIM
OUT
9
4
6
R
G
AMP01
2.75k⍀
REF-02
R5
2
3
2.21k⍀
G
V–
11
R6
500⍀
ZERO TRIM
R1
100⍀
R4
100⍀
–IN
0V
I
OUT
4mA TO 20mA
0.047F
–5V
COMPLIANCE OF I
, +20V WITH +30V SUPPLY (OUTPUT w.r.t. 0V)
OUT
DIFFERENTIAL INPUT OF 100mV FOR 16mA SPAN
OUTPUT RESISTANCE ~5M⍀ AT I
= 20mA
OUT
LINEARITY 0.01% OF SPAN
Figure 37. 13-Bit Linear 4–20 mA Transmitter Constructed by Adding a Voltage Reference.
Thermocouple Signals Can Be Accepted Without Preamplification.
REV. D
–16–
ADI [ ADI ]
