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ALD1121E

QUAD/DUAL EPAD® PRECISION N-CHANNEL MATCHED PAIR MOSFET ARRAY

Advanced Linear Devices 

These MOSFET devices have very low input currents and,

as a result, a very high input impedance (>1012 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 100nA to 3mA

range, and with either a positive, negative, or zero tempco.

Optional EPAD Threshold Voltage Trimming by User

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 current and/or on-

resistance characteristics, it can be set up to 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 ALD1121E/ALD1123E can be e-trimmed with an ALD

EPAD programmer to obtain the desired voltage and

current levels. They can also 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.

APPLICATIONS

• 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-trimmable gain amplifiers

• Low level signal conditioning

• Sensor and transducer bias currents

• Neural networks

BENEFITS (cont.)

• Usable in environmentally sealed circuits

• No mechanical moving parts -- high G-shock

tolerance

• Improved reliability, dependability, dust and

moisture resistance

• Cost and labor savings

• Small footprint for high board density

applications

FEATURES

• Electrically Programmable Analog Device

• Proven, non-volatile CMOS technology

• Operates from 2V, 3V, 5V to 10V

• Flexible basic circuit building block and design

element

• Very high resolution -- average e-trim voltage

resolution of 0.1mV

• Wide dynamic range -- current levels from 0.1µA

to 3000µA

• Voltage adjustment range from 1.000V to 3.000V

in 0.1mV steps

• Typical 10-year drift of less than 2mV

• Usable in voltage mode or current mode

• High input impedance -- 1012Ω

• Very high DC current gain -- greater than 109

• Device operating current has positive temperature

coefficient range and negative temperature

coefficient range with cross-over zero temperature

coefficient current level at 68µA

• Tight matching and tracking of on-resistance

between different devices with e-trim

• Very low input currents and leakage currents

• Low cost, monolithic technology

• Application-specific or in-system programming modes

• Optional user software-controlled automation

• Optional e-trim of any standard/custom configuration

• Micropower operation

• Available in standard PDIP, SOIC and hermetic CDIP

packages

• Suitable for matched-pair balanced circuit configuration

• Suitable for both coarse and fine trimming, as well as

matched MOSFET array applications

• RoHS compliant

ALD1121E/ALD1123E

Advanced Linear Devices

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