TC850

1 TC850 15-BIT, FAST-INTEGRATING CMOS ANALOG-TO-DIGITAL CONVERTER FEATURES s s s s 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 2 3 4 5 6 7 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. The TC850 incorporates an ADC and a µP-compatible digital interface. Only a voltage reference and a fe...