MAX191

Features:

12-Bit Resolution, 1/2LSB Linearity
+5V or ±5V Operation
Built-In Track/Hold
Internal Reference with Adjustment Capability
Low Power:  3mA Operating Mode ,20µA Power-Down Mode
100ksps Tested Sampling Rate
Serial and 8-Bit Parallel µP Interface
24-Pin Narrow DIP and Wide SO Packages


Application

Battery-Powered Data Logging
PC Pen Digitizers
High-Accuracy Process Control
Electromechanical Systems
Data-Acquisition Boards for PCs
Automatic Testing Systems
Telecommunications
Digital Signal Processing (DSP)


Pinout




Specifications

VDD to DGND............................................................-0.3V to +7V
VSS to AGND ............................................................-7V to +0.3V
VDD to VSS ............................................................................12V
AGND, VREF, REFADJ to DGND................     -0.3V to (VDD + 0.3V)
AIN+, AIN-, PD to VSS.................................-0.3V to (VDD + 0.3V)
CS, RD, CLK, BIP, HBEN, PAR, to DGND....   -0.3V to (VDD + 0.3V)
BUSY, D0D7 to DGND..............................  -0.3V to (VDD + 0.3V)
Continuous Power Dissipation (TA = +70°C)
Narrow Plastic DIP (derate 13.33mW/°C above +70°C)..1067mW
Wide SO (derate 11.76mW/°C above +70°C) ..................941mW
Narrow CERDIP (derate 12.50mW/°C above +70°C) .....1000mW


Description

The MAX191 is a monolithic, CMOS, 12-bit analog-to-digital converter (ADC) featuring differential inputs, track/hold (T/H), internal voltage reference, internal or external clock, and parallel or serial µP interface. The MAX191 has a 7.5µs conversion time, a 2µs acquisition time, and a guaranteed 100ksps sample rate.The MAX191 operates from a single +5V supply or from
dual ±5V supplies, allowing ground-referenced bipolar input signals. The device features a logic power-down input, which reduces the 3mA VDD supply current to 50µA max, including the internal-reference current.

Decoupling capacitors are the only external components needed for the power supply and reference. This ADC operates with either an external reference, or an internal reference that features an adjustment input for trimming system gain errors. The MAX191 provides three interface modes: two 8-bit parallel modes, and a serial interface mode that is compatible with ^_SPITM, ^_QSPITM, and _MICROWIRE^TM  serial-interface standards.