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GENERAL DESCRIPTION

The TC850 is a monolithic CMOS analog-to-digital converter (ADC) with resolution of 15-bits plus sign. It combines a chopper-stabilized buffer and integrator with a unique multiple-slope integration technique that increases conversion speed. The result is 16 times improvement in speed over previous 15-bit, monolithic integrating ADCs (from 2.5 conversions per sec up to 40 per sec). Faster conversion speed is especially welcome in systems with human interface, such as digital scales.

FEATURES

■ 15-bit Resolution Plus Sign Bit

■ Up to 40 Conversions per Second

■ 12 Conversions per Second Guaranteed

■ Integrating ADC Technique

— Monotonic

— High Noise Immunity

— Auto-Zeroed Amplifiers Eliminate Offset Trimming

■ Wide Dynamic Range ...................................... 96dB

■ Low Input Bias Current ................................... 30pA

■ Low Input Noise ........................................... 30μVP-P

■ Sensitivity ....................................................... 100μV

■ Flexible Operational Control

— Continuous or On-Demand Conversions

— Data Valid Output

■ Bus Compatible, 3-State Data Outputs

— 8-Bit Data Bus

— Simple μP Interface

— Two Chip Enables

— Read ADC Result Like Memory

■ ± 5V Power Supply Operation ...................... 20mW

■ 40-Pin Dual-in-Line or 44-Pin PLCC Packages