ICL7116CQH+TD

ADCs/DACs - Special Purpose Overview

The ICL7116CQH+TD is a 3½ digit monolithic analog-to-digital converter (ADC) manufactured by Analog Devices Inc./Maxim Integrated. It features dual-slope integration with a dedicated Hold pin for indefinite display freezing. The device directly drives LCD displays without external circuitry, utilizing high-impedance CMOS differential inputs and on-chip clock and reference circuits. Key electrical parameters include a maximum power dissipation of 800 mW in the plastic package, a supply voltage range of 9 V, and a maximum operating temperature of +70°C.

ADCs/DACs - Special Purpose Feature Summary

• Integrated Hold Pin: Allows indefinite freezing of the digital reading independent of conversion cycles.
• Direct Display Drive: On-board capability to drive LCD segments and backplanes without external drivers.
• Dual-Slope Integration: Automatically rejects common-mode interference signals typical in industrial environments.
• High Accuracy: Features rollover error less than one count and zero reading drift under 1µV/°C.

ADCs/DACs - Special Purpose Applications

• Digital panel meters
• Precision null applications requiring true polarity indication
• Measurement and display of analog data such as pressure, voltage, resistance, and temperature

ADCs/DACs - Special Purpose Procurement Notes

Verify component authenticity through authorized distributors or official manufacturer channels. Confirm RoHS compliance status via the specific datasheet revision. Ensure proper handling procedures are followed due to moisture sensitivity classification. Cross-reference ordering suffixes carefully to match required package types and temperature ranges.

ADCs/DACs - Special Purpose Selection Notes

Select this model when direct LCD interfacing is required without additional driver logic. The ICL7116 differs from the ICL7106 by including a Hold pin for display freezing. Verify that the application requires a 3½ digit resolution and operates within the specified 9 V supply constraints. Consider the ICL7117 if LED display output is needed instead of LCD.

ADCs/DACs - Special Purpose Part Context

This component belongs to the Maxim ICL7116/ICL7117 family of integrating ADCs. It serves as an enhanced version of the ICL7106/ICL7107 series, adding a Hold input and improved overload recovery characteristics. The device utilizes CMOS process technology and is designed for low-noise, high-precision measurement systems.

ADCs/DACs - Special Purpose Replacement Considerations

The ICL7106 is a functional equivalent but lacks the Hold pin feature. The ICL7117 provides identical ADC performance but drives LED displays instead of LCDs. Verify pin compatibility and display interface requirements before substitution.

ADCs/DACs - Special Purpose FAQ

How does the Hold pin function?

Connecting the Hold pin to V+ inhibits the display latch pulse, freezing the current reading indefinitely while conversions continue internally. Leaving it open pulls the pin low via an internal resistor, allowing continuous updates.

What is the maximum power dissipation?

The maximum power dissipation is 800 mW for the plastic package and 1000 mW for the ceramic package.

Does the device require external components for operation?

No external display drivers are required as the device has on-board display drive capability. However, external capacitors and resistors are needed for the oscillator, integrator, and reference circuits as shown in the typical operating circuit.