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Description

The Intersil ICL7139 and ICL7149 are high performance, low power, auto-ranging digital multimeter lCs. Unlike other autoranging multimeter ICs, the ICL7139 and ICL7149 always display the result of a conversion on the correct range. There is no “range hunting” noticeable in the display. The unit will autorange between the four different ranges. A manual switch is used to select the 2 high group ranges. DC current ranges are 4mA and 40mA in the low current group, and 400mA and 4A in the high current group. Resistance measurements are made on 4 ranges, which are divided into two groups. The low resistance ranges are 4/40k?. The high resistance ranges are 0.4/4M?. Resolution on the lowest range is 1?.

Features

? 13 Ranges - ICL7139

- 4 DC Voltage 400mV, 4V, 40V, 400V

- 1 AC Voltage 400V

- 4 DC Current 4mA, 40mA, 400mA, 4A

- 4 Resistance 4k?, 40k?, 400k?, 4M?

? 18 Ranges - ICL7149

- 4 DC Voltage 400mV, 4V, 40V, 400V

- 2 AC Voltage with Optional AC Circuit

- 4 DC Current 4mA, 40mA, 400mA, 4A

- 4 AC Current with Optional AC Circuit

- 4 Resistance 4k?, 40k?, 400k?, 4M?

? Autoranging - First Reading is Always on Correct Range

? On-Chip Duplex LCD Display Drive Including Three Decimal Points and 11 Annunciators

? No Additional Active Components Required

? Low Power Dissipation - Less than 20mW - 1000 Hour Typical Battery Life

? Display Hold Input

? Continuity Output Drives Piezoelectric Beeper

? Low Battery Annunciator with On-Chip Detection

? Guaranteed Zero Reading for 0V Input on All Ranges