ICL7134 Technical Summary

ICL7134 - 14-Bit Multiplying Digital-to-Analog Converter (DAC)

Overview

The ICL7134 is a high-precision, four-quadrant multiplying digital-to-analog converter (DAC) that combines thin-film resistor technology with advanced CMOS circuitry. This integrated circuit features an on-chip PROM-controlled correction circuit that enables true 14-bit performance without requiring external adjustments. The device is designed for applications demanding high accuracy and stability, offering exceptional linearity and low temperature coefficients.

With its microprocessor-compatible interface and double-buffered inputs, the ICL7134 simplifies system integration while maintaining precision performance. The four-quadrant multiplication capability makes it suitable for a wide range of analog signal processing applications.

Key Features

14-bit linearity (0.003% Full Scale Range)
No gain adjustment required due to on-chip PROM correction
Microprocessor-compatible interface with double-buffered inputs
Bipolar operation without additional adjustments or external resistors
Excellent temperature stability with low linearity and gain temperature coefficients
Low power consumption for energy-sensitive applications
Full four-quadrant multiplication capability
Military-grade versions available (883B processed)

Applications

The ICL7134 is suitable for a wide range of precision analog applications, including:

Automated test equipment (ATE)
Process control systems
Precision instrumentation
Digital signal processing systems
Programmable gain amplifiers
Analog waveform generation
Military and aerospace systems
Medical instrumentation
Audio processing equipment

Electrical Characteristics

Absolute Maximum Ratings

Supply Voltage (V+ to V-): ±18V
Digital Input Voltage: -0.3V to V+ +0.3V
Reference Input Voltage: ±V Supply
Power Dissipation: 500mW
Operating Temperature Range:
- Commercial: 0°C to +70°C
- Industrial: -25°C to +85°C
- Military: -55°C to +125°C
Storage Temperature Range: -65°C to +150°C

DC Characteristics (TA = +25°C, V+ = +15V, V- = -15V unless otherwise specified)

Resolution: 14 bits
Integral Nonlinearity (INL): ±1 LSB max (0.003% FSR)
Differential Nonlinearity (DNL): ±0.5 LSB max
Gain Error: ±0.05% FSR max after correction
Gain Temperature Coefficient: ±5 ppm/°C typ
Zero-Scale Error: ±1 mV max
Power Supply Rejection Ratio (PSRR): 80 dB min
Reference Input Resistance: 10 kΩ typ
Reference Input Current: ±100 nA max
Output Leakage Current: ±10 nA max
Power Consumption: 100 mW typ

AC Characteristics

Settling Time to ±0.003% FSR: 10 μs typ
Glitch Impulse: 10 nV-s typ
Digital Feedthrough: ±0.5 LSB max
Digital Input Capacitance: 10 pF typ

Functional Description

The ICL7134 architecture consists of several key functional blocks:

Digital Interface

The double-buffered input structure allows simultaneous update of multiple DACs while maintaining data integrity. The interface includes:

14-bit parallel data input
Chip select (CS) input
Write (WR) control input
Load DAC (LDAC) control for synchronous updates

DAC Core

The multiplying DAC core uses precision thin-film resistors and CMOS switches to achieve high accuracy. The four-quadrant architecture allows both positive and negative reference voltages and output currents.

Correction Circuitry

The on-chip PROM stores calibration coefficients that automatically compensate for gain and linearity errors, eliminating the need for manual adjustments.