Intersil

ICL7129 - 4 1/2 Digit LCD Display, A/D Converter

Photograph

Features ±19,999 Count A/D Converter Accurate to ±4 Count 10µV Resolution on 200mV Scale 110dB CMRR Direct LCD Display Drive True Differential Input and Reference Low Power Consumption Decimal Point Drive Outputs Overrange and Underrange Outputs Low Battery Detection and Indication 10:1 Range Change Input

Pin Description Pin Number Description 1 OSC1 - Oscillator 2 OSC3 - Oscillator 3 ANN - Annunciator Drive 4 B1,C1,CONT - Output to display segments 5 A1,G1,D1 - Output to display segments 6 F1,E1,DP1 - Output to display segments 7 B2,C2,LO BATT - Output to dispaly segments 8 A2,G2,D2 - Output to display segments 9 F2,E2,DP2 - Output to display segments 10 B3,C3,MINUS - Output to display segments 11 A3,G3,D3 - Output to display segments 12 F3,E3,DP3 - Output to display segments 13 B4,C4,BC5 - Output to display segments 14 A4,D4,G4 - Output to display segments 15 F4,E4,DP4 - Output to display segments 16 BP3 - Backplane 3 17 BP2 - Backplane 2 18 BP1 - Backplane 1 19 Vdisp - Negative rail for display drivers 20 DP4/OR - See data sheet 21 DP3/UR - See data sheet 22 LATCH/HOLD - See data sheet 23 V- - Negative Supply 24 V+ - Positive Supply 25 INT IN - Integrator Input 26 INT OUT - Integrator Output 27 CON - Continuity 28 COMMON - Common-mode voltage 29 Cref+ - Reference Capacitor 30 Cref- - Reference Capacitor 31 BUFFER - Buffer 32 IN LO - Negative Input 33 IN HI - Positive Input 34 REF HI - Reference High 35 REF LO - Reference Low 36 DGND - Digital Ground Reference 37 RANGE - Range Setting 38 DP2 - Decimal Point 2 39 DP1 - Decimal Point 1 40 OSC2 - Oscillator

Pin Layout Dimensional Drawing

Technical Data Data Sheet Intersil - Data Sheet for ICL7129 Application Notes Overcoming Common Mode Range Issues When Using Intersil Integrating Converters