LM134 Series
U
TYPICAL APPLICATIO S
Precision 10nA Current Source
Micropower 5V Reference
V
IN
= 6.5V TO 15V
15V
V
+
R
LM334
R
LM134
5.6k
R1
–
2.7k
V
7
3
+
–
6
R2
226k
LM4250
V
OUT
= 5V
LT1004-1.2
15V
2
8
LT1004-1.2
(1.235V)
22M
R3
3.01M
1%
4
150pF
1M
2
7
–
1M
1%
BUFFERED
VOLTAGE
OUTPUT
R4
100MΩ
6
LT1008
3
8
TA15
+
I
200pF
O
4
I
Z
= 10nA
12
O
–15V
≥ 10 Ω
O
TA14
COMPLIANCE = –14V TO 12.5V
FET Cascoding for Low Capacitance
and/or Ultrahigh Output Impedance
V
IN
V
IN
I
SET
+
V
LM334
R
Q1*
V
+
LM334
R
R
SET
–
V
Q2*
R
SET
–
V
I
SET
TA16
–V
–V
IN
IN
*SELECT Q1 OR Q2 TO ENSURE AT LEAST 1V
ACROSS THE LM134. V (1 – I /I ) ≥ 1.2V.
P
SET DSS
W
W
SCHE ATIC DIAGRA
+
V
Q7
Q8
Q4
Q5
Q6
Q3
Q2
Q1
C1
50pF
R
V
–
134 SD
9
Linear [ Linear ]
