TYPICAL APPLICATIONS (cont.)
BASIC CURRENT SOURCES
P- CHANNEL CURRENT SOURCE
N- CHANNEL CURRENT SOURCE
+
V
= +5V
+
+
= +5V
V
= +5V
V
I
R
SET
SET
I
R
SOURCE
M
SOURCE
6
8
7
6
M
M
4
3
5
7
3
2
8
M
1
3
2
5
2
1
I
R
SET
R
SOURCE
I
SET
SOURCE
M1, M2:
ALD1101,
ALD1116,
M3, M4:
ALD1109xx,
ALD2129xx,
1/2 ALD1103,
1/2 ALD1105,
1/2 ALD1106,
1/2 ALD1108xx, or
1/2 ALD2108xx
ALD1102,
ALD1117,
1/2 ALD1103,
1/2 ALD1105,
1/2 ALD1107, or
1/2 ALD3107xx
+
R
V
- Vt
SET
I
= I =
SET
SOURCE
where Vt = V
GS
- V
GS(th)
= V
DS
M , M : P - Channel MOSFET
3
4
M , M :N - Channel MOSFET
1
2
CASCODE CURRENT SOURCES
+
V
= +5V
+
+
V
= +5V
V
= +5V
I
I
R
R
SOURCE
SET
SET
SOURCE
M
M
1
2
M
M
3
4
M
3
M
I
4
M
M
1
2
I
SET
R
SET
R
SOURCE
SOURCE
M3, M4:
ALD1102,
M1, M2:
ALD1102,
ALD1117,
M1, M2:
ALD1101,
ALD1116,
ALD2129xx,
1/2 ALD1103,
1/2 ALD1105,
M3, M4:
ALD1101,
ALD1116,
1/2 ALD1103,
1/2 ALD1105,
ALD1117,
1/2 ALD1103,
1/2 ALD1105,
1/2 ALD1107, or
1/2 ALD3107xx
1/2 ALD1103,
1/2 ALD1105,
1/2 ALD1107, or
1/2 ALD3107xx
+
V
- 2Vt
SET
I
= I
SET
=
SOURCE
R
1/2 ALD1106, or
1/2 ALD2108xx
1/2 ALD1106, or
1/2 ALD2108xx
where Vt = V
GS
- V
= V
DS
GS(th)
M , M , M , M : P - Channel MOSFET
1
2
3
where M1 and M2 is a matched pair
4
M , M , M , M : N - Channel MOSFET
1
2
3
where M1 and M2 is a matched pair
4
and M3 and M4 is a second matched pair.
and M3 and M4 is a second matched pair.
ALD210808A/ALD210808
Advanced Linear Devices
10 of 12
ALD [ ADVANCED LINEAR DEVICES ]
