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4 1/2 Digit ADC with Multiplexed BCD Outputs

Product Details

Key Features

Parametric specs for Display-Oriented ADCs
Resolution (±Counts) 20000
# Input Channels 1
Data Bus µP/4
UART
Diff/S.E. Input Diff. Only
External VREF (V) (min) -5
External VREF (V) (max) 5
Bipolar VIN (±V) (max) 2
Package/Pins MQFP/44
PDIP/28
PLCC/28
SSOP/28
Budgetary
Price (See Notes)
10.62
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Simplified Block Diagram

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Parameters

Parametric specs for Display-Oriented ADCs
Resolution (±Counts) 20000
# Input Channels 1
Data Bus µP/4
UART
Diff/S.E. Input Diff. Only
External VREF (V) (min) -5
External VREF (V) (max) 5
Bipolar VIN (±V) (max) 2
Package/Pins MQFP/44
PDIP/28
PLCC/28
SSOP/28
Budgetary
Price (See Notes)
10.62

Key Features

  • Improved 2nd Source (See our “Maxim Advantage™” Page 3)
  • ±20,000 Count Resolution
  • Guaranteed ±1 Count accuracy
  • Over-range, under-range signals for auto-range capability
  • Easy interface to UARTs and µPs
  • TTL compatible, Multiplexed BCD outputs
  • True differential input. Zero reading guaranteed for 0 volt Input
  • True polarity at zero for precise null detection
  • Monolithic CMOS Design

Applications/Uses

  • Current
  • Material Thickness
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  • Resistance
  • Speed
  • Temperature
  • Voltage
  • Weight

Description

The Maxim ICL7135 is a high precision monolithic 41/2 digit A/D converter. Dual slope conversion reliability is combined with ±1 in 20,000 count accuracy and a 2.0000V full scale capability. It features high impedance differential inputs, nearly ideal differential linearity, true ratiometric operation, auto zero and auto-polarity. The multiplexed BCD outputs and digit drivers provide easy interface to external display drivers like the Maxim ICM7211A. The only other external components needed to make precision DVM/DPMs are a reference and a clock. For more complex systems the BCD outputs are enhanced by Active-Low STROBE, OVERRANGE, UNDERRANGE, RUN/Active-Low HOLD and BUSY lines providing easy interface to microprocessors and UARTs. This interfacing capability makes the ICL7135 an ideal device for use in microprocessor based data acquisition and control systems.

The ICL7135 has auto-zero accuracy better than 10µV, zero drift of 0.5µV/°C, input bias current of 10pA max. and rollover error of less than 1 count.

Simplified Block Diagram

ICL7135: Typical Operating Circuit ICL7135: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .