Keithley DAS-8PGA / DAS-8PG2 Analog-to-Digital Converter

The Keithley DAS-8PGA and DAS-8PG2 are 8-channel, 12-bit successive approximation analog-to-digital converters designed for ISA bus-based data acquisition on IBM PC and compatible systems. Both models integrate programmable gain amplification, sample-and-hold circuitry, digital I/O, and counter/timer functionality in a single board, delivering flexible signal conditioning and acquisition capabilities for scientific research, industrial automation, and quality control applications.

Technical Specifications Analog Input Subsystem

8 channels with 12-bit resolution and 25 µs typical conversion time (35 µs maximum)

Switch-selectable single-ended or differential input configuration per channel

Input impedance >1 GΩ typical; input current ±30 nA @ 25°C, ±250 nA over temperature

Maximum overvoltage rating ±35 V per channel

DAS-8PGA: Software-programmable ranges of ±10 V, ±5 V, ±0.5 V, ±0.05 V, ±0.01 V, 0 to +10 V, 0 to +1 V, 0 to +0.02 V

DAS-8PG2: Software-programmable ranges of ±5 V, ±2.5 V, ±1.25 V, ±0.625 V, 0 to +5 V, 0 to +2.5 V, 0 to +1.25 V, 0 to +0.625 V

Linearity ±1 bit; throughput up to 4 ksamples/s with DriverLINX software Digital I/O

3-bit input port and 4-bit output port; TTL-compatible levels

Non-clocked data transfer without hardware overrun detection Counter/Timer

Three 16-bit internal counters using Intel 8254 or equivalent 82C54 chip

Supports event counting, pulse and waveform generation, frequency, period, and pulse-width measurements

Counter 2 clock source: internally selectable between PC bus clock or 1 MHz crystal oscillator

Key Features

Programmable gain amplification across eight input channels

Integrated sample-and-hold per conversion cycle

Flexible input range selection tailored to signal amplitude

TTL-compatible digital I/O for system integration

Multi-function counter/timer for timing and measurement tasks

Typical Applications Data acquisition in laboratory environments, sensor signal digitization, industrial process monitoring, and test automation where programmable input conditioning and modest sampling rates are sufficient.

Compatibility & Integration ISA bus architecture supports IBM PC and compatible systems. Supplied DriverLINX software provides software control and real-time sampling.