ALD1123E/ALD1121E are monolithic quad/dual EPAD® (Electrically Program-
mable Analog Device) N-channel MOSFETs with electrically adjustable threshold
(turn-on) voltage. The ALD1123E/ALD1121E 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. SN1,
SN2 share a common substrate pin V-1 which has to be connected to the most
negative voltage potential. Likewise, SN3, SN4 share a common substrate pin V-2
which has to be connected to the negative voltage potential for SN3, SN4. The
ALD1121E has two (2) separate source pins (SN1, SN2). Both SN1, SN2 share a
common substrate pin 4 which has to be connected to the most negative voltage
potential.
Using an ALD1123E/ALD1121E MOSFET array is simple and straight forward. The
MOSFETs function in electrical characteristics as n-channel MOSFETs except that
all the devices have exceptional matching to each other. 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.
These MOSFET devices have very low input currents, and as a result a very high
input impedance (>10 12 Ohm). The gate voltage from a control source can drive
many MOSFET inputs with practically no loading effects. Used in precision current
mirror or current multiplier applications, they can be used to provide a current source
over a 100 nA to 3 mA range, and with either a positive, negative or zero tempco.
Optional EPAD Threshold Voltage Trimming By User
•
Precision PC-based electronic calibration
•
Automated voltage trimming or setting
•
Remote voltage or current adjustment of
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
inaccessible nodes
PCMCIA based instrumentation trimming
Electrically adjusted resistive load
Temperature compensated current sources
and current mirrors
Electrically trimmed/calibrated current
sources
Permanent precision preset voltage level
shifter
Low temperature coefficient voltage and/or
current bias circuits
Multiple preset voltage bias circuits
Multiple channel resistor pull-up or pull-down
circuits
Microprocessor based process control systems
Portable data acquisition systems
Battery operated terminals and instruments
Remote telemetry systems
E-trim gain amplifiers
Low level signal conditioning
Sensor and transducer bias currents
Neural networks
BLOCK DIAGRAM
ALD1121E
P
N1
(1)
D
N1
(3)
D
N2
(7)
P
N2
(5)
G
N1
(2)
G
N2
(6)
The basic EPAD MOSFET device is a monotonically adjustable device which means
the device can normally be e-trimmed to increase in threshold voltage and to
decrease in drain-on current as a function of a given input bias voltage. Used as an
in-circuit element for trimming or setting a combination of voltage and/or current
characteristics, it can be e-trimmed remotely and automatically. Once e-trimmed,
the set voltage and current levels are stored indefinitely inside the device as a
nonvolatile stored charge, which is not affected during normal operation of the
device, even when power is turned off. A given EPAD device can be adjusted many
times to continually increase its threshold voltage. A pair of EPAD devices can also
be connected differentially such that one device is used to adjust a parameter in one
direction and the other device is used to adjust the same parameter in the other
direction.
The ALD1123E/ALD1121E can be e-trimmed with the ALD EPAD programmer to
obtain the desired voltage and current levels. Or they can be e-trimmed as an active
in-system element in a user system, via user designed interface circuitry. PN1, PN2,
etc., are pins required for optional e-trim of respective MOSFET devices. If unused,
these pins are to be connected to V- or ground. For more information, see
Application Note AN1108.
ALD1123E
M1
S
N1
(4)
V- (4)
BLOCK DIAGRAM
P
N1
(1)
G
N1
(2)
S
N1
(4)
V-
1
(4)
S
N2
(16)
S
N3
(12)
ALD1123E/ALD1121E
Advanced Linear Devices
~
~
M1
~
M2
S
N2
(8)
D
N1
(3)
D
N2
(15)
P
N2
(13)
P
N3
(9)
D
N3
(11)
D
N4
(7)
P
N4
(5)
G
N2
(14) G
N3
(10)
G
N4
(6)
M2
M3
M4
V-
2
(8)
S
N4
(8)
2
ABSOLUTE MAXIMUM RATINGS
Supply voltage, V
+
referenced to V
-
Supply voltage, V
S
referenced to V
-
Differential input voltage range
Power dissipation
Operating temperature range PA, SA, PC, SC package
DA, DC package
Storage temperature range
Lead temperature, 10 seconds
-0.3V to +13.2V
±6.6V
0.3V to V
+
+0.3V
600 mW
0°C to +70°C
-55°C to +125°C
-65°C to +150°C
+260°C
OPERATING ELECTRICAL CHARACTERISTICS
T
A
= 25
°
C V+ = +5.0V unless otherwise specified
Parameter
Drain to Source Voltage
1
Initial Threshold Voltage
2
E-trim Vt Range
Drain - Gate Connected
Voltage Tempco
Symbol
V
DS
V
t i
V
t
TCV
DS
0.990
1.000
-1.6
-0.3
0.0
+2.7
Initial Offset Voltage
3
V
OS i
1
5
1.000
ALD1123E
Min
Typ
Max
10.0
1.010
3.000
0.990
1.000
-1.6
-0.3
0.0
+2.7
1
5
1.000
Min
ALD1121E
Typ
Max
10.0
1.010
3.000
Unit
V
V
V
mV/°C
mV/°C
mV/°C
mV/°C
mV
I
D
= 5µA
I
D
= 50µA
I
D
= 68µA
I
D
= 500µA
I
DS
= 1µA T
A
= 21°C
Test
Conditions
Tempco of V
OS
Differential Threshold Voltage
Tempco of Differential
Threshold Voltage
4
Long Term Drift
Long Term Drift Match
Drain Source On Current
4
TCV
OS
DV
t
5
2.000
5
2.000
µV/°C
V
V
DS1
= V
DS2
TCDV
t
∆V
t
/∆t
∆V
t
/∆t
I
DS(ON)
0.033
-0.02
-5
3.0
-0.05
0.033
-0.02
-5
3.0
-0.05
mV/°C
mV
µV
mA
1000 Hours
1000 Hours
V
G
=V
D
= 5V V
S
= 0V
V
t
= 1.0
Drain Source On Current
4
I
DS(ON)
0.8
0.8
mA
V
G
=V
D =
5V V
S =
0V
V
t
= 3.0
V
t
= 1.000V
Initial Zero Tempco Voltage
3
Zero Tempco Current
Initial On-Resistance
3
On-Resistance Match
V
ZTCi
I
ZTC
R
ON i
∆R
ON
1.52
68
500
0.5
1.52
68
500
0.5
V
µA
Ω
%
V
GS
¡= 5V V
DS
= 0.1V
NOTES:
1. V+ must be the most positive supply rail and V- must be at the most negative supply rail. Source terminals other than those labeled as V- can be at
any voltage between V- and V+.
2. Initial Threshold Voltage is set at the factory. If no EPAD Vt trimming is intended by user, then this is also the final or permanent threshold voltage
value.
3. Initial and Final values are the same unless deliberately changed by user.
4. These parameters apply only when Vt of one or more of the devices are to be changed by user.
This is a program I wrote to test the AD conversion speed. However, when I was simulating the hardware, I found that I couldn't enter the timer interrupt. Even changing the DCO clock source didn't wor...
I would like to ask, do I need to add a 164245 between the 5402 and the 5V powered GAL16V8D input? I looked at the chip data and the VIH of the GAL16V8D is 2V....
0 Introduction
With the development of my country's economy, the number of motor vehicles continues to increase. The growth of existing roads and other hardware facilities can no longer meet t...[Details]
At present, the traffic congestion in cities is quite serious. According to relevant news reports: In China, the traffic congestion has expanded from megacities such as Beijing, Shanghai, and Guang...[Details]
1 Introduction
As an emerging microfabrication technology, micro-electromechanical system (MEMS) technology has begun to be applied in various fields. It can integrate functions such as inform...[Details]
1 Introduction
In recent years, there have been many major advances in the production technology and processes of automotive headlights, which have greatly improved the performance of automoti...[Details]
Flooded Batteries
This battery developed in Germany can be used to power flashlights, strobe lights and toys as long as it is filled with water. This battery can be stored for 50 years and can...[Details]
Different initialization between C8051F and 80C51 series microcontrollers
In the past 30 years, major electronic component manufacturers in the world have launched their own unique single-chip...[Details]
Introduction
Liquid crystal, as a display device, is widely used in low-power products such as instruments, meters, and electronic equipment with its unique advantages. In the past, the displ...[Details]
With concerns about the growing energy crisis, motor efficiency has become an important and timely topic. This is because motors use 63% to 70% of the electricity produced in the United States and ...[Details]
1. Overview
At present, an information revolution is in the ascendant around the world, led by microelectronics, computers and communication technologies, and centered on information technolog...[Details]
1 Introduction
With the improvement of people's quality of life, lamps are no longer just basic indoor lighting tools, but also a kind of practical art for architectural decoration. When ther...[Details]
Key Points
1. Now, in addition to high-end smartphones and tablets, users also expect to use touch screens in other applications, and they are gradually appearing in cars and instruments.
...[Details]
Overview
By transmitting ultrasonic energy into the human body and receiving and processing the returning reflected signals, phased array ultrasound systems can generate images of organs and s...[Details]
1 Introduction
With the rapid economic development, my country's electricity demand has been growing at a rate of more than 20% per year. According to the current economic development trend an...[Details]
Almost everyone in a student dormitory has a bedside lamp. But if you want to read for a while after turning off the lights and don't want to disturb your roommates' sleep, you may need a reading l...[Details]
The fluorescent lamps and energy-saving lamps we commonly use now have greatly improved luminous efficiency compared with the earlier ordinary incandescent lamps and have been widely used. With the...[Details]
Power technology
京公网安备 11010802033920号
EEWORLD
