TM
A
L
D
DVANCED
INEAR
EVICES, INC.
®
e
EPAD
A
ALD1121E/ALD1123E
QUAD/DUAL EPAD® PRECISION N-CHANNEL MATCHED PAIR MOSFET ARRAY
GENERAL DESCRIPTION
BENEFITS
®
ALD1121E/ALD1123E are monolithic quad/dual EPAD (Electrically
• Precision matched electrically after
packaging
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.
• Simple, elegant single-chip user option
to trim voltage/current values
• Excellent device matching characteristics
with or without additional electrical trim
The ALD1123E has four (4) separate source pins. S , S
share a
common substrate pin, V- , which has to be connected to the most
N1 N2
• Remotely and electrically trim parameters
1
on circuits that are physically inaccessible
negative voltage potential. Likewise, S , S share a common substrate
N3 N4
pin, V- , which has to be connected to the negative voltage potential for
2
S
, S . The ALD1121E has two (2) separate source pins (S , S ).
N3 N4
Both S , S
N1 N2
PIN CONFIGURATION
share a common substrate, pin 4, which has to be
N2
N1
connectedtothemostnegativevoltagepotential. Foragiveninputvoltage,
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.
ALD1121E
P
S
D
8
7
N1
1
2
N2
M 1
G
N1
N2
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,thethresholdvoltageofaMOSFETdevicedetermines
itsdrainon-current, resultinginan on-resistancecharacteristicthatcanbe
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.
D
G
P
N1
6
5
N2
3
4
M 2
-
S
V
N1,
N2
TOP VIEW
SAL, PAL, DA PACKAGES
ALD1123E
M 1
M 2
ORDERING INFORMATION (“L” suffix denotes lead-free (RoHS))
1
2
3
4
5
6
7
8
P
G
D
S
16
15
14
13
12
11
10
9
S
N1
N1
N1
N2
Operating Temperature Range*
D
N2
0°C to +70°C
0°C to +70°C
-55°C to +125°C
G
P
N2
-
V
8-Pin SOIC
Package
8-Pin Plastic Dip
Package
8-Pin CERDIP
Package
N2
1, N1
S
P
N4
N3
D
N3
G
ALD1121ESAL
ALD1121EPAL
ALD1121EDA
N4
N4
D
S
G
P
N3
16-Pin SOIC
Package
16-Pin Plastic Dip
Package
16-Pin CERDIP
Package
-
V
N3
2, N4
M 4
M 3
ALD1123ESCL
ALD1123EPCL
ALD1123EDC
TOP VIEW
SCL, PCL, DC PACKAGES
* Contact factory for leaded (non-RoHS) or high temperature versions.
BLOCK DIAGRAM
BLOCK DIAGRAM
ALD1121E
ALD1123E
P
(13)
D
N3
(11)
P
(1)
D
N1
(3)
P
(9)
D
N4
(7)
P
(5)
N4
D
N2
(15)
N2
N1
N3
N4
D
(7)
P
N2
(5)
P
(1)
D
(3)
N1
N2
N1
G
(2)
N1
G
(10)
N3
G
(6)
G
(14)
N2
G
(6)
G (2)
N1
N2
~
M 2
M 3
M 4
M 1
~
~
M 1
M 2
-
S (4)
N1
S
N1
(4)
-
S
N2
(16)
S
N3
(12)
V
(4)
S
(8)
N2
-
S (8)
N4
V
(4)
V
(8)
1
2
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