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Analog Devices Inc./Maxim Integrated ICL7109CQH+D
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- Part No.:
- ICL7109CQH+D
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
ICL7109CQH+D.pdf
- Description:
- IC ADC 12BIT DUAL SLOPE 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,701
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Product details
Overview
ICL7109CQH+D from Maxim Integrated is a 12-bit dual-slope analog-to-digital converter (ADC) with built-in display drivers, operating from ±5 V supplies and featuring 10 µV typical input resolution, 0.05% linearity error, and internal reference voltage of 2.8 V. It is used in digital panel meters and precision instrumentation requiring stable DC measurement.
For engineers reviewing the ICL7109CQH+D datasheet, ICL7109CQH+D pinout, ICL7109CQH+D application, or ICL7109CQH+D equivalent, key selection factors include dual-slope integration time, on-chip segment drivers for 7-segment displays, ±5 V supply compatibility, and internal 2.8 V reference stability over temperature.
Technical Context
The ICL7109CQH+D implements a dual-slope conversion architecture with auto-zeroing and signal integration phases controlled by internal logic. It includes a 4-bit segment decoder and digit driver outputs compatible with common-anode LED displays.
Conversion timing is determined by the internal clock oscillator (typ. 120 kHz) and user-selectable integration cycle (100 ms or 120 ms), enabling rejection of 50 Hz and 60 Hz line interference. The device supports multiplexed 4-digit display output without external latching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit effective, delivering 1 part in 4096 measurement granularity for DC voltage inputs |
| Input Range | ±2 V full-scale differential input, supporting direct connection to transducer outputs |
| Linearity Error | ±0.05% FS, ensuring minimal code-dependent gain deviation across full scale |
| Reference Voltage | 2.8 V internal reference, trimmed and stable over 0°C to +70°C operating range |
| Supply Voltage | ±5 V ±5%, enabling use with standard dual-rail linear power supplies |
| Integration Time | Selectable 100 ms or 120 ms, providing inherent 50/60 Hz noise rejection |
Pinout & Package
ICL7109CQH+D is housed in a 28-pin ceramic DIP (Dual In-line Package) with 0.6-inch body width and 0.1-inch pin pitch. Pin assignments are defined per Maxim's official package drawing 28-0012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply | Connects to +5 V rail; powers analog and digital sections |
| V− | Negative supply | Connects to −5 V rail; required for bipolar input operation |
| IN+ | Differential input positive | High-impedance input terminal for signal source connection |
| IN− | Differential input negative | Completes differential input pair; referenced to AGND |
| REF IN | Reference input | Accepts external 2.8 V reference or connects to internal reference |
| SEG A–G | Segment driver outputs | Directly drive common-anode 7-segment LED segments |
| DIG 1–4 | Digit driver outputs | Provide multiplexed anode select signals for 4-digit display |
Key Features
| Feature | Design Value |
|---|---|
| Dual-slope conversion architecture | Provides inherent rejection of 50/60 Hz power-line interference without external filtering |
| On-chip 4-digit LED segment drivers | Eliminates need for external decoder/driver ICs in panel meter designs |
| Internal 2.8 V reference | Reduces component count and improves long-term drift performance vs. external references |
| Auto-zero function | Compensates for offset drift in input amplifier and integrator during idle phase |
| Multiplexed digit outputs | Supports direct interface to 4-digit common-anode LED displays with minimal external parts |
Applications
| Digital Panel Meter | Benchtop Multimeter |
|---|---|
Use Scenario: Front-panel voltage/current measurement in industrial control cabinets. IC Role / Device Role / Timing Role: Primary ADC and display controller handling signal acquisition, conversion, and 4-digit LED drive. Use Value: Eliminates separate display driver IC and reduces BOM count by integrating segment/digit drivers. | Use Scenario: Portable handheld multimeter requiring high DC accuracy and low power consumption. IC Role / Device Role / Timing Role: Core measurement engine performing dual-slope integration and driving segmented LCD/LED readout. Use Value: Internal 2.8 V reference and auto-zeroing ensure <0.05% linearity without calibration trimmers. |
| Process Monitoring Instrument | Calibration Standard Equipment |
Use Scenario: Fixed-mount sensor interface in HVAC or water treatment systems. IC Role / Device Role / Timing Role: Analog front-end ADC converting 4–20 mA loop signals into digital display values. Use Value: ±2 V input range and differential architecture reject common-mode noise from long sensor cables. | Use Scenario: Lab-grade reference instrument requiring traceable DC voltage measurement. IC Role / Device Role / Timing Role: Precision DC measurement subsystem with integrated reference and auto-zero compensation. Use Value: 10 µV typical input resolution and 100 ms integration time enable sub-0.01% repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-slope ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7129CQH+ | 13-bit resolution, higher input impedance (1013 Ω), no internal reference - requires external 2.8 V source | Suitable for ultra-high-impedance sensor interfaces where leakage current must be minimized | Choose ICL7129CQH+ only when >12-bit resolution and pA-level input bias are required |
| MAX132ACPP+ | 18-bit sigma-delta architecture, serial interface (SPI), ±2.5 V reference, no integrated display drivers | Used in microcontroller-based data loggers needing high resolution but no direct LED drive | Choose MAX132ACPP+ when system uses MCU-controlled display and demands >12-bit precision |
Compared with ICL7109CQH+D, the ICL7129CQH+ offers higher resolution but lacks on-chip reference and display drivers, while the MAX132ACPP+ provides superior resolution and digital interface at the cost of requiring external display control and higher system integration effort.
Availability
ICL7109CQH+D is available at Aetrix Electronics and suitable for digital panel meters, benchtop test equipment, and process monitoring instruments requiring stable component supply and long-lifecycle support.
Supply support for ICL7109CQH+D 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 applications.
The ICL7109CQH+D belongs to Maxim's legacy precision ADC product line, engineered specifically for standalone digital metering applications with integrated display interfacing capability.
FAQ
What is the operating temperature range for the ICL7109CQH+D?
The ICL7109CQH+D is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade range aligns with its target use in indoor instrumentation and panel-mounted meters. The internal 2.8 V reference and auto-zero circuitry maintain performance within this range without external compensation. ICL7109CQH+D does not support extended or industrial temperature grades.
Does the ICL7109CQH+D require an external clock source?
No, the ICL7109CQH+D contains an internal oscillator that operates at approximately 120 kHz and drives the dual-slope conversion timing. External clocking is not supported or required. The integration cycle (100 ms or 120 ms) is set via pin configuration and derived from this internal oscillator. ICL7109CQH+D eliminates the need for external crystal or RC timing components.
Can the ICL7109CQH+D drive common-cathode LED displays?
No, the ICL7109CQH+D segment and digit drivers are designed exclusively for common-anode LED displays. Its SEG A–G and DIG 1–4 outputs source current, not sink it. Driving common-cathode displays would require external transistor inverters or level-shifting buffers. ICL7109CQH+D's hardware interface is fixed to common-anode topology per Maxim's datasheet specification.
What is the maximum input signal frequency the ICL7109CQH+D can accurately convert?
The ICL7109CQH+D is optimized for DC and very low-frequency signals only. Its dual-slope architecture limits usable input bandwidth to under 10 Hz for full 12-bit accuracy. Higher frequencies cause integration errors and reduced effective resolution. ICL7109CQH+D is not intended for AC or dynamic signal acquisition - it serves strictly as a precision DC voltmeter core.
Is the internal reference of the ICL7109CQH+D accessible for external use?
Yes, the 2.8 V internal reference is available at the REF OUT pin and can be used to bias external circuitry such as op-amp comparators or sensor excitation networks. Output current capability is limited to ±100 µA; loading beyond this may degrade reference accuracy and temperature stability. ICL7109CQH+D's REF OUT is buffered but not designed for high-current applications.
ICL7109CQH+D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Active
- 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-PLCC (16.59x16.59)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ICL7109CQH+D FAQ
1.How can I place an order for ICL7109CQH+D through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7109CQH+D 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 ICL7109CQH+D reliable?
The price and inventory of ICL7109CQH+D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7109CQH+D is usually 5 days.
3.What payment methods are accepted for ICL7109CQH+D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7109CQH+D transactions.
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4.How is shipping managed for ICL7109CQH+D?
ICL7109CQH+D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7109CQH+D 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 ICL7109CQH+D?
For technical support, including ICL7109CQH+D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7109CQH+D requirements.
6.How does Aetrix verify that ICL7109CQH+D is sourced from the original manufacturer or authorized distributors?
All ICL7109CQH+D 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 ICL7109CQH+D meets industry standards.
7.What is the process for return or replacement of ICL7109CQH+D?
All ICL7109CQH+D units undergo pre-shipment inspection (PSI). If there is an issue with ICL7109CQH+D, 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 ICL7109CQH+D part is unused and in its original packaging.
Return procedure for ICL7109CQH+D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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