ICL7135C

Features:

Zero Reading for 0-V Input
Precision Null Detection With True Polarity
   at Zero
1-pA Typical Input Current
True Differential Input
Multiplexed Binary-Coded-Decimal (BCD)
   Output
Low Rollover Error: ±1 Count Max
Control Signals Allow Interfacing With
   UARTs or Microprocessors
Autoranging Capability With Over-and
   Under-Range Signals
TTL-Compatible Outputs
Direct Replacement for Teledyne TSC7135,
   Intersil ICL7135, Maxim ICL7135, and
   Siliconix Si7135
CMOS Technology


Pinout




Specifications

Supply voltage (V_CC+with respect to V_CC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V
Analog input voltage (IN or IN+) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V_CCto V_CC+
Reference voltage range    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                   V_CCto V_CC+
Clock input voltage range    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .            0 V to VCC+
Operating free-air temperature range, T_A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     0 to 70
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     -65  to 150
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: N package . . . . . . . . . . . . . . . . . . . . 260

Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditi ons" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

Description

The ICL7135C converters are manufactured with Texas Instruments highly efficient CMOS technology. These 4 1/2-digit, dual-slope-integrating, analog-to-digital converters (DACs) are designed to provide interfaces to both a microprocessor and a visual display. The digit-drive outputs D1 through D4 and multiplexed binary-coded-decimal outputs B1, B2, B4, and B8 provide an interface for LED or LCD decoder/drivers as well as microprocessors.

The ICL7135C offer 50-ppm (one part in 20,000) resolution with a maximum linearity error of one count. The zero error is less than 10
µV and zero drift is less than 0.5 µV/°C. Source-impedance errors are minimized by low input current (less than 10 pA). Rollover error is limited to
± 1 count.

The BUSY, STROBE, RUN/,HOLD, OVER RANGE, and UNDER RANGE control signals support microprocessor-based measurement systems. The control signals also can support remote data acquisition systems with data transfer through universal asynchronous receiver transmitters (UARTs).

The ICL7135C are characterized for operation from 0°C to 70°C.