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