GENERAL DESCRIPTION

The ALD2321A/ ALD2321B/ ALD2321 is a monolithic Precision Dual Voltage Comparator, each having integrated dual complementary output drivers. It is constructed using advanced silicon gate CMOS technology. Key features of the ALD2321A/ ALD2321B/ ALD2321 include very high input impedance, very low offset voltage utilizing onchip e-trim (EPAD® electronic-trimming) technology, flexible multiple output configurations and fast response time with small overdrive voltage. It is designed for ultra low level signal detection from high impedance sources. For many applications the ALD2321A/ ALD2321B/ALD2321 can eliminate an input amplification stage, a precision input bias stage, a signal level shift stage and an output buffer stage, and do the entire job from low level input signal detection to high output driver ---- all on a single chip.

PRODUCT FEATURES

* Ultra low signal power of 4 fW detectable

* Ultra low offset voltage of max. 0.2 mV

* Ultra low input bias currents of typ. 0.01pA

* Low supply current of 110 µA typical

* Virtually eliminates source impedance effects

* Low operating supply voltage of 3V to 10V

* Single +5V and dual supply ±5V operation

* High speed for both small and large level signals 300ns typical for TTL inputs

* CMOS, NMOS and TTL compatible

* Each comparator has separate push and pull outputs

* High output sink current - typically 50mA

* Low supply current spikes

* Fanout of 30 TTL loads

APPLICATIONS

* Low level signal detector

* Dual limit window comparator

* Power supply voltage monitor

* Photo-detector sensor circuit

* Relay or LED driver

* Oscillators

* Battery operated instruments

* Remote signal detection