Description
The Intersil HI7131 and HI7133 are 3 1/2 digit, A/D converters that have been optimized for superior DC Common Mode Rejection (CMRR) when used with a split ±5V supply or a single 9V battery. The HI7131 contains all the necessary active components on a single IC to directly interface an LCD (Liquid Crystal Display). The supply current is under 100µA and is ideally suited for battery operation. The HI7133 contains all the necessary active components on a single IC to directly interface an LED (Light Emitting Diode).

Features
• 120dB CMRR Equal to ±0.01 Count/V of Common Mode Voltage Error
• Fast Recovery from Input Overrange Results “Correct First-Reading” After Overload
• Guaranteed 0000 Reading for 0V Input
• True Polarity at Zero for Precise Null Detection
• 1pA Input Current (Typ)
• True Differential Input and Reference
• Single or Dual Supply Operation Capability
• Direct LCD Display Drive - HI7131
• Direct LED Display Drive - HI7133
• Low Noise, 15µVP-P Without Hysteresis or Overrange Hangover
• Low Power Dissipation, Guaranteed Less Than 1mW, Results 8000 Hours (Typ) 9V Battery Life
• No Additional Active Components Required

Applications
• Handheld Instruments
• Basic Measurements: Voltage, Current, Resistance Pressure, Temperature, Fluid Flow and Level, pH, Weight, Light Intensity
• DMMs and DPMs