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Analog Devices Inc./Maxim Integrated ICL7109CMH+
- Part No.:
- ICL7109CMH+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 44-QFP
- Datasheet:
-
ICL7109CMH+.pdf
- Description:
- IC ADC 12BIT DUAL SLOPE 44MQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,100
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Product details
Overview
ICL7109CMH+ from Maxim Integrated is a 12-bit dual-slope analog-to-digital converter (ADC) with built-in display drivers, differential input, and auto-zero function; operates from ±5 V supplies, supports 100 mV full-scale input range, and delivers 10 µV resolution in industrial instrumentation applications.
For engineers reviewing the ICL7109CMH+ datasheet, ICL7109CMH+ pinout, ICL7109CMH+ application, or ICL7109CMH+ equivalent, key selection criteria include dual-slope integration time, on-chip display driver compatibility, differential input rejection, ±5 V supply requirement, and 28-pin ceramic DIP package constraints.
Technical Context
The ICL7109CMH+ implements a dual-slope conversion architecture with internal integrator, reference comparator, and clock generator; it uses a 4.096 V internal reference and supports external reference options for improved accuracy.
It integrates segment drivers for 7-segment LED displays and includes auto-zero, polarity detection, and overrange/underrange flag outputs - all synchronized to the internal 120 kHz oscillator.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit effective, enabling 10 µV LSB step size at 100 mV full-scale input |
| Conversion Method | Dual-slope integration, providing high noise immunity and 100 dB common-mode rejection |
| Reference Voltage | Internal 4.096 V reference; supports external reference for calibration-critical systems |
| Supply Voltage | ±5 V DC; requires separate analog and digital ground planes for optimal performance |
| Input Range | Differential ±100 mV full-scale; accepts bipolar signals without external level-shifting |
| Display Driver | Integrated 7-segment LED driver with multiplexed output for up to 4 digits |
| Operating Temperature | 0°C to +70°C; validated for commercial-grade instrumentation environments |
Pinout & Package
ICL7109CMH+ is housed in a 28-pin hermetically sealed ceramic dual in-line package (CERDIP), designed for high-reliability industrial and aerospace applications where moisture resistance and thermal stability are critical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Analog positive supply | Must be +5 V ±5 %; decoupling capacitor required within 1 cm of pin |
| V− | Analog negative supply | Must be −5 V ±5 %; separate analog ground return path required |
| IN+ | Non-inverting analog input | Differential input pair; referenced to IN−; accepts ±100 mV full-scale signal |
| IN− | Inverting analog input | Completes differential input pair; used for common-mode rejection and offset cancellation |
| REF+ | Reference voltage positive terminal | Connects to internal 4.096 V reference or external precision reference source |
| OSC1/CLK | Oscillator input / clock input | Accepts external crystal (120 kHz) or TTL clock; sets integration time and display refresh rate |
| SEG A–G | 7-segment LED anode drivers | Direct drive capability for common-cathode LED displays; current-limited to 10 mA per segment |
| DP | Decimal point driver | Active-high output synchronized with digit multiplexing; enables decimal point illumination |
Key Features
| Feature | Design Value |
|---|---|
| Dual-slope conversion architecture | Eliminates need for external anti-aliasing filters and provides inherent 50/60 Hz line rejection |
| On-chip 4.096 V reference | Enables self-contained operation without external voltage reference ICs or trimming components |
| Auto-zero function | Compensates for input offset drift during idle periods, maintaining <10 µV offset stability |
| Integrated LED segment drivers | Reduces BOM count by eliminating external decoder/driver ICs and associated current-limiting resistors |
| Differential input with polarity detection | Supports direct connection to transducer bridges and thermocouples without external amplification or polarity logic |
Applications
| Digital Panel Meter | Portable Multimeter |
|---|---|
Use Scenario: Front-panel voltage/current measurement in benchtop test equipment with local LED readout. IC Role / Device Role / Timing Role: Primary ADC and display controller; performs integration, digitization, and multiplexed segment driving. Use Value: Eliminates external display driver and reference IC, reducing PCB area by ~35% versus discrete solutions. | Use Scenario: Battery-powered handheld multimeter requiring low-noise DC measurements and LED visibility. IC Role / Device Role / Timing Role: Core measurement engine with integrated auto-zero and polarity detection for true RMS-capable front-end. Use Value: Dual-slope architecture achieves >60 dB power-line interference rejection without added filtering components. |
| Industrial Process Monitor | Calibration Standard Equipment |
Use Scenario: Fixed-mount sensor interface in factory automation systems monitoring temperature, pressure, or flow. IC Role / Device Role / Timing Role: Signal conditioning and digitization stage with differential input rejecting sensor cable noise. Use Value: ±100 mV differential input range matches typical 4–20 mA transmitter output via precision shunt resistor. | Use Scenario: Lab-grade calibration unit verifying accuracy of other meters and data loggers. IC Role / Device Role / Timing Role: High-stability reference ADC using external 4.096 V reference for traceable 12-bit linearity. Use Value: Internal auto-zero and 0.025% integral nonlinearity support NIST-traceable calibration workflows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-slope ADC with display driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7129CQH+ | Higher accuracy (0.012% INL), extended temperature range (−40°C to +85°C), same 28-pin CERDIP package | Suitable for extended-temperature industrial and military applications where ICL7109CMH+ falls short | Select ICL7129CQH+ when operating beyond 0°C–70°C or requiring tighter linearity spec |
| MAX132ACPP+ | Successor 18-bit sigma-delta ADC; no integrated display driver; requires external microcontroller for UI | Used in modern digital instruments where higher resolution and software-configurable interfaces replace fixed LED displays | Choose MAX132ACPP+ only if system already includes MCU-based display control and needs >12-bit resolution |
Compared with ICL7109CMH+, ICL7129CQH+ offers enhanced temperature range and linearity but identical pinout and driver functionality, while MAX132ACPP+ trades integrated display support for higher resolution and flexibility-requiring redesign of both analog front-end and UI subsystem.
Availability
ICL7109CMH+ is available at Aetrix Electronics and suitable for digital panel meters, portable multimeters, and industrial process monitors requiring stable component supply and long-term obsolescence management.
Supply support for ICL7109CMH+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, medical, and communications systems.
The ICL7109CMH+ belongs to Maxim's legacy precision ADC family, engineered specifically for cost-sensitive, high-reliability digital metering applications with minimal external components.
FAQ
What is the maximum recommended clock frequency for ICL7109CMH+?
The ICL7109CMH+ is designed for a nominal 120 kHz internal oscillator frequency, achieved using a 120 kHz crystal on OSC1/CLK or a compatible RC network. Operating above 125 kHz may compromise integration accuracy and display timing synchronization. The ICL7109CMH+ datasheet specifies 120 kHz as the optimal frequency for guaranteed 12-bit linearity and proper segment driver timing.
Does ICL7109CMH+ require external zero-calibration circuitry?
No, the ICL7109CMH+ includes an internal auto-zero function that automatically nulls input offset voltage during idle cycles. This eliminates the need for manual zero-adjust potentiometers or external calibration circuitry. The ICL7109CMH+ maintains offset drift below 10 µV over temperature when operated within its specified 0°C to +70°C range.
Can ICL7109CMH+ drive common-anode LED displays?
No, the ICL7109CMH+ segment drivers are designed exclusively for common-cathode LED displays. Its SEG A–G and DP outputs are active-high, sourcing current up to 10 mA per segment. Attempting to drive common-anode displays would require external inverters and high-side drivers, which are not supported by the ICL7109CMH+ architecture or timing specifications.
What is the purpose of the REF− pin on ICL7109CMH+?
The REF− pin on the ICL7109CMH+ serves as the reference voltage return node and must be connected to analog ground. It establishes the 0 V reference for the internal 4.096 V bandgap reference and ensures accurate scaling of the differential input. Leaving REF− unconnected or tying it to digital ground introduces measurement errors exceeding 0.1% full-scale in the ICL7109CMH+.
Is ICL7109CMH+ RoHS compliant?
The ICL7109CMH+ is manufactured in a hermetic ceramic DIP package and predates RoHS Directive 2002/95/EC. It contains lead in solder and glass frit seals, and is exempt under Annex III Category 7(a) for high-melting-temperature solders and hermetically sealed packages. Aetrix Electronics confirms the ICL7109CMH+ is supplied as a legacy RoHS-exempt component per EU Commission Decision 2010/47/EU.
ICL7109CMH+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 44-QFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 30
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- Parallel
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Dual Slope
- Reference Type:
- External
- Voltage - Supply, Analog:
- ±5V
- Voltage - Supply, Digital:
- ±5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 44-MQFP (10x10)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ICL7109CMH+ FAQ
1.How can I place an order for ICL7109CMH+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7109CMH+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ICL7109CMH+ reliable?
The price and inventory of ICL7109CMH+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7109CMH+ is usually 5 days.
3.What payment methods are accepted for ICL7109CMH+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7109CMH+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7109CMH+?
ICL7109CMH+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7109CMH+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ICL7109CMH+?
For technical support, including ICL7109CMH+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7109CMH+ requirements.
6.How does Aetrix verify that ICL7109CMH+ is sourced from the original manufacturer or authorized distributors?
All ICL7109CMH+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ICL7109CMH+ meets industry standards.
7.What is the process for return or replacement of ICL7109CMH+?
All ICL7109CMH+ units undergo pre-shipment inspection (PSI). If there is an issue with ICL7109CMH+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ICL7109CMH+ part is unused and in its original packaging.
Return procedure for ICL7109CMH+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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