LT574A

Features:

Industry-Standard 574A Compatible
Complete 12-Bit A/D Converter with Reference and Clock
Improved Reference Output Current Capability
25s Maximum Conversion Time
Fast Bus Access Time
8- or 16-Bit Microprocessor Interface
Guaranteed Linearity over Temperature


Application

Signal Processing
Data Acquisition
Process Monitoring and Control


Pinout




Specifications

V_CC to Digital Common ..................................................................................... 0V to 22V
V_EE to Digital Common ...................................................................................... 0V to 16.5V
V_LOGIC to Digital Common ................................................................................ 0V to 7V
Analog Common to Digital Common ................................................................. ±1V
Digital Inputs to Digital Common....................................................................... 0.5V to V_LOGIC + 0.5V
Analog Inputs (REF In, BIP Off, 10V_IN) to Analog Common................................ V_EE to 16.5V
20V_IN to Analog Common .................................................................................. V_EE to 24V
REF Out ............................................................................................................. Indefinite Short to Analog Common Momentary Short to V_CC
Power Dissipation............................................................................................... 1000mW
Junction Temperature......................................................................................... 165°C
Operating Temperature Range J, K, L Grades .................................................... 0°C to 70°C
Storage Temperature ......................................................................................... 65°C to 150°C
Lead Temperature (Soldering, 10 sec) ............................................................... 300°C


Description

The LT^®574A is a complete 12-bit A/D converter in the industry-standard 574A pinout. The three-state output buffers interface directly to an 8- or 16-bit microprocessor bus. A high precision 10V reference and clock are included on-chip, and the device provides full-rated performance without external circuitry or clock signals.

The LT574A provides several advantages over other 574A type devices. External load driving capability of the reference has been improved to up to 8.5mA beyond the ADC current required. Maximum V_CC has been increased to 22V and the reference can source full load current at a V_CC of 11.4V without requiring an external buffer. The reference is trimmed to 10.00V with 0.2% maximum error and 5ppm/°C typical TC. Bus timing specifications are significantly faster than original 574A specifications, easing microprocessor interface concerns.