A
DVANCED
L
INEAR
D
EVICES,
I
NC.
TM
ALD1121E/ALD1123E
e
®
EPAD
D
LE
AB
E
N
QUAD/DUAL EPAD
®
PRECISION N-CHANNEL MATCHED PAIR MOSFET ARRAY
GENERAL DESCRIPTION
ALD1121E/ALD1123E are monolithic quad/dual EPAD
®
(Electrically
Programmable Analog Device) N-channel MOSFETs with electrically
adjustable threshold (turn-on) voltage. The ALD1121E/ALD1123E are
precision matched and adjusted (e-trimmed) at the factory resulting in
quad/dual MOSFETs that are highly matched in electrical characteristics.
The ALD1123E has four (4) separate source pins. S
N1
, S
N2
share a
common substrate pin, V-
1
, which has to be connected to the most
negative voltage potential. Likewise, S
N3
, S
N4
share a common substrate
pin, V-
2
, which has to be connected to the negative voltage potential for
S
N3
, S
N4
. The ALD1121E has two (2) separate source pins (S
N1
, S
N2
).
Both S
N1
, S
N2
share a common substrate, pin 4, which has to be
connected to the most negative voltage potential. For a given input voltage,
the threshold voltage of a MOSFET device determines its drain on-current,
resulting in an on-resistance characteristic that can be precisely preset and
then controlled by the input voltage very accurately.
Using an ALD1121E/ALD1123E is simple and straight forward. The
MOSFETs function as n-channel MOSFETs, except that all the devices
have exceptional matching to each other in electrical characteristics. For
a given input voltage, the threshold voltage of a MOSFET device determines
its drain on-current, resulting in an on-resistance characteristic that can be
precisely preset and then controlled by the input voltage very accurately.
Since these devices are on the same monolithic chip, they also exhibit
excellent tempco matching characteristics.
ORDERING INFORMATION
(“L” suffix denotes lead-free (RoHS))
0°C to +70°C
8-Pin SOIC
Package
ALD1121ESAL
16-Pin SOIC
Package
ALD1123ESCL
Operating Temperature Range*
0°C to +70°C
-55°C to +125°C
8-Pin Plastic Dip
Package
ALD1121EPAL
16-Pin Plastic Dip
Package
ALD1123EPCL
8-Pin CERDIP
Package
ALD1121EDA
16-Pin CERDIP
Package
ALD1123EDC
BENEFITS
•
Precision matched electrically after
packaging
•
Simple, elegant single-chip user option
•
•
to trim voltage/current values
Excellent device matching characteristics
with or without additional electrical trim
Remotely and electrically trim parameters
on circuits that are physically inaccessible
PIN CONFIGURATION
ALD1121E
P
N1
G
N1
D
N1
S
N1,
V-
1
M1
2
3
M2
4
5
TOP VIEW
SAL, PAL, DA PACKAGES
8
7
6
S
N2
D
N2
G
N2
P
N2
ALD1123E
P
N1
G
N1
D
N1
V-
1,
S
N1
P
N4
G
N4
D
N4
V-
2,
S
N4
1
2
3
4
5
6
7
8
M4
M3
M1
M2
16
15
14
13
12
11
10
9
S
N2
D
N2
G
N2
P
N2
S
N3
D
N3
G
N3
P
N3
* Contact factory for leaded (non-RoHS) or high temperature versions.
TOP VIEW
SCL, PCL, DC PACKAGES
BLOCK DIAGRAM
ALD1123E
P
N1
(1)
D
N1
(3)
D
N2
(15)
P
N2
(13)
P
N3
(9)
D
N3
(11)
D
N4
(7)
P
N4
(5)
BLOCK DIAGRAM
ALD1121E
P
N1
(1)
D
N1
(3)
D
N2
(7)
P
N2
(5)
G
N1
(2)
G
N2
(14) G
N3
(10)
G
N4
(6)
G
N1
(2)
G
N2
(6)
S
N1
(4)
V-
1
(4)
S
N2
(16)
S
N3
(12)
Rev 2.0 ©2012 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286
www.aldinc.com
~
V-
2
(8)
~
M1
M2
M3
M4
M1
S
N4
(8)
S
N1
(4)
~
M2
V- (4)
S
N2
(8)
ALD [ ADVANCED LINEAR DEVICES ]
