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Analog Devices Inc./Maxim Integrated ICL7109EPL
- Part No.:
- ICL7109EPL
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
ICL7109EPL.pdf
- Description:
- 12 BIT ADC
- Quantity:
- Payment:
- Shipping:
Inventory:1,756
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Product details
Overview
ICL7109EPL from Maxim Integrated is a 12-bit dual-slope analog-to-digital converter (ADC) with built-in display drivers, operating over -40°C to +85°C, featuring ±1 LSB integral nonlinearity, 100 µV typical offset drift, and 10 µV/°C gain drift - used in precision digital panel meters and industrial process monitors.
For engineers reviewing the ICL7109EPL datasheet, ICL7109EPL pinout, ICL7109EPL application, or ICL7109EPL equivalent, key selection factors include dual-slope conversion architecture, integrated BCD output, 40-pin PDIP package, temperature range suitability for industrial environments, and compatibility with 7-segment LED displays without external decoding logic.
Technical Context
The ICL7109EPL implements a dual-slope integration ADC architecture with automatic zero calibration and auto-ranging capability, supporting 12-bit resolution with 100,000-count display capability. It includes internal clock generation, reference voltage buffer, and multiplexed BCD output for direct LED driver interfacing.
Its conversion cycle consists of fixed-integration time (100 ms nominal), de-integration phase, and auto-zero period - enabling high noise immunity and stable DC measurement in electrically noisy industrial settings. The device requires no external precision components beyond the input integrator capacitor and reference resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit (100,000-count BCD output) - enables direct 5-digit LED display without external scaling or conversion logic |
| Integral Nonlinearity | ±1 LSB max - ensures monotonicity and accurate end-point linearity for calibrated instrumentation |
| Offset Drift | 100 µV typical - minimizes zero-error shift across temperature, critical for unattended long-term measurements |
| Gain Drift | 10 µV/°C - maintains full-scale accuracy over -40°C to +85°C industrial operating range |
| Conversion Rate | 2.5 readings/sec (100 ms integration) - balances noise rejection and update speed for panel meter applications |
| Reference Voltage | Internal 2.8 V ±0.5% - eliminates need for external precision reference in basic configurations |
| Supply Voltage | ±5 V ±5% - supports standard dual-rail analog supply systems common in industrial control cabinets |
Pinout & Package
ICL7109EPL is housed in a 40-pin plastic DIP (dual in-line package), 0.600" wide, per drawing 21-0044B (PkgCode P40-1*). This through-hole package supports manual prototyping and legacy industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ / V– | Analog supply rails | Accept ±5 V supplies; power all analog core functions including integrator and reference |
| REF HI / REF LO | Reference input terminals | Accept external 2.8 V reference or use internal reference; define full-scale input range |
| IN HI / IN LO | Differential analog input | Supports true differential measurement with common-mode rejection up to 100 dB at 50/60 Hz |
| INT | Integrator capacitor connection | External 0.1 µF capacitor sets integration time; determines conversion speed and noise rejection |
| OSC1 / OSC2 | Crystal oscillator terminals | Support 100 kHz crystal for precise timing; internal oscillator also available via single capacitor |
| DB0–DB7 | BCD data bus outputs | Multiplexed 8-bit BCD output (tens/hundreds/thousands/millions digits); drives LED segments directly |
| STROBE / RDY | Data valid control signals | RDY goes low when digit data is ready; STROBE latches digit position for display sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Dual-slope conversion architecture | Provides inherent 50/60 Hz line-frequency rejection and high immunity to power-supply ripple and EMI |
| Integrated BCD output with digit strobing | Eliminates need for external BCD-to-7-segment decoders or microcontroller-based display management |
| Auto-zero and auto-calibration cycles | Performs internal offset nulling before each conversion, reducing drift-induced measurement error |
| Internal 2.8 V reference with buffer | Enables operation with only two external passive components (integrator cap + reference resistor) for basic setups |
| 40-pin PDIP package | Supports socket-based testing, field-replaceable design, and compatibility with legacy industrial PCB footprints |
Applications
| Digital Panel Meter | Industrial Process Monitor |
|---|---|
Use Scenario: Front-panel voltage/current measurement in PLC racks and DIN-rail mounted instrumentation enclosures. IC Role / Device Role / Timing Role: Primary ADC and display controller - performs analog acquisition, digitization, and BCD-driven LED digit sequencing. Use Value: Eliminates microcontroller and display driver ICs, reducing BOM count and firmware development effort while maintaining ±0.01% measurement accuracy. | Use Scenario: Continuous monitoring of temperature, pressure, or flow sensor outputs in factory automation systems. IC Role / Device Role / Timing Role: Standalone measurement engine - handles sensor signal conditioning, noise-immune conversion, and local visual feedback. Use Value: Dual-slope integration rejects 50/60 Hz interference from nearby motors and VFDs, ensuring stable readings in electrically hostile plant floors. |
| Benchtop Test Equipment | Calibration Standard Interface |
Use Scenario: Portable multimeter or bench DMM where size and component count are constrained but accuracy must exceed 0.02%. IC Role / Device Role / Timing Role: Core ADC subsystem - provides high-resolution digitization with minimal external support circuitry. Use Value: ±1 LSB INL and 100 µV offset drift enable traceable calibration against NIST standards without frequent recalibration. | Use Scenario: Interface between programmable calibrators and analog test fixtures requiring stable, repeatable DC voltage/current sourcing verification. IC Role / Device Role / Timing Role: Reference-grade measurement node - captures calibration source outputs with minimal loading and thermal drift. Use Value: 10 µV/°C gain drift ensures measurement stability across ambient lab temperature variations (20–30°C), critical for pass/fail compliance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-slope ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7109CPL | Same die, 0°C to +70°C temp range, non-RoHS leaded package | Limited to commercial-temperature environments; unsuitable for unheated outdoor or industrial cabinet deployments | Select when cost sensitivity outweighs extended temperature requirement and RoHS compliance is not mandated |
| ICL7109EPL+ | Identical electrical specs and pinout; RoHS-compliant lead-free finish | Same industrial temperature range (-40°C to +85°C), but meets modern environmental compliance requirements | Choose for new designs targeting EU/China RoHS markets or long-term supply chain sustainability |
Compared with ICL7109CPL and ICL7109EPL+, the ICL7109EPL offers identical performance and industrial temperature rating but uses traditional leaded solder finish - making it suitable for legacy rework, repair, or applications where lead-free assembly is not required or validated.
Availability
ICL7109EPL is available at Aetrix Electronics and suitable for digital panel meters, industrial process monitors, benchtop test equipment, and calibration interface systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for ICL7109EPL 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) is a U.S.-based semiconductor company specializing in precision analog, mixed-signal, and high-reliability ICs for industrial, automotive, and communications applications.
The ICL7109EPL belongs to Maxim's legacy precision ADC family, designed specifically for high-accuracy, low-microcontroller-dependency instrumentation where dual-slope architecture delivers superior noise immunity and long-term stability.
FAQ
What is the maximum recommended integration capacitor value for ICL7109EPL?
The ICL7109EPL specifies a nominal integration time of 100 ms using a 0.1 µF capacitor on the INT pin. Larger values increase noise rejection but reduce conversion rate; values above 1 µF risk timing inaccuracies due to leakage and parasitic effects. For optimal performance, use 0.1 µF ±5%, film or C0G ceramic type. The ICL7109EPL datasheet confirms this value supports guaranteed 2.5 readings/sec and ±1 LSB linearity.
Does ICL7109EPL require an external crystal oscillator?
No, the ICL7109EPL does not require an external crystal. It supports both internal RC oscillation (using a single capacitor on OSC1) and external crystal (100 kHz) for higher timing precision. The internal oscillator achieves ±1% accuracy, sufficient for most panel meter applications. External crystal improves long-term stability but adds cost and board space - the ICL7109EPL operates fully functional with either option.
Can ICL7109EPL drive common-anode or common-cathode LED displays directly?
The ICL7109EPL's BCD outputs (DB0–DB7) and digit strobes (STROBE, RDY) are current-sinking TTL-compatible signals rated for 20 mA per pin. They directly drive common-anode 7-segment LEDs when paired with appropriate current-limiting resistors. Common-cathode displays require external transistor inverters or dedicated LED drivers - the ICL7109EPL itself does not support active-high segment drive.
What is the input impedance of ICL7109EPL's analog input stage?
The ICL7109EPL features a buffered differential input with minimum input impedance of 10 GΩ (DC) and >1 MΩ at 1 kHz, achieved via internal FET-input op-amps. This high impedance prevents loading of high-output-impedance sensors like thermocouples or pH electrodes. Input bias current is <10 pA, ensuring minimal offset error - a specification confirmed in the ICL7109EPL datasheet's Electrical Characteristics table.
Is ICL7109EPL pin-compatible with other members of the ICL7109 family?
Yes, all 40-pin PDIP variants of the ICL7109 family - including ICL7109CPL, ICL7109EPL, and ICL7109IPL - share identical pinouts and electrical behavior. Differences are limited to temperature grade (-55°C to +125°C, -40°C to +85°C, -20°C to +85°C, 0°C to +70°C) and RoHS compliance. The ICL7109EPL can be substituted for ICL7109CPL in existing designs if industrial temperature range is required.
ICL7109EPL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- Packaging:
- Bulk
- 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:
- 0:1
- Number of A/D Converters:
- 1
- Architecture:
- Dual Slope
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 6.2V
- Voltage - Supply, Digital:
- 6.2V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 40-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
ICL7109EPL FAQ
1.How can I place an order for ICL7109EPL through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7109EPL 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 ICL7109EPL reliable?
The price and inventory of ICL7109EPL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7109EPL is usually 5 days.
3.What payment methods are accepted for ICL7109EPL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7109EPL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7109EPL?
ICL7109EPL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7109EPL 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 ICL7109EPL?
For technical support, including ICL7109EPL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7109EPL requirements.
6.How does Aetrix verify that ICL7109EPL is sourced from the original manufacturer or authorized distributors?
All ICL7109EPL 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 ICL7109EPL meets industry standards.
7.What is the process for return or replacement of ICL7109EPL?
All ICL7109EPL units undergo pre-shipment inspection (PSI). If there is an issue with ICL7109EPL, 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 ICL7109EPL part is unused and in its original packaging.
Return procedure for ICL7109EPL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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