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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:
- IC ADC 12BIT DUAL SLOPE 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,170
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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, housed in a 28-pin PDIP package. It features ±1 LSB integral nonlinearity, 10 µV/°C offset drift, and supports 3½-digit decimal readout for panel meter applications.
For engineers reviewing the ICL7109EPL+ datasheet, ICL7109EPL+ pinout, ICL7109EPL+ application, or ICL7109EPL+ equivalent, key selection considerations include dual-slope integration time, on-chip segment drivers, zero/positive/negative polarity handling, and compatibility with 7-segment LED displays without external decoding logic.
Technical Context
The ICL7109EPL+ implements a dual-slope conversion architecture with internal integrator, reference comparator, and clock generator. It performs automatic zero calibration and auto-polarity detection during each conversion cycle, supporting both unipolar and bipolar input ranges up to ±2 V full-scale.
Its internal timing control eliminates need for external crystal or RC network - a dedicated 120 kHz oscillator drives the 4,000-count conversion cycle. The device outputs BCD data synchronized to a 50/60 Hz line-referenced sampling rate, minimizing power-line interference in precision measurement systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit (3½-digit BCD output), enabling direct interface to 3-digit LED displays without external BCD decoder |
| Conversion Type | Dual-slope integration - provides inherent rejection of 50/60 Hz noise and high immunity to power supply ripple |
| Input Range | ±2 V full-scale differential input; supports unipolar (0–2 V) and bipolar (–2 V to +2 V) modes via external resistor configuration |
| Integral Nonlinearity | ±1 LSB max - ensures monotonicity and accuracy across full scale without software correction |
| Offset Drift | 10 µV/°C - maintains calibration stability over industrial temperature range (0°C to +70°C) |
| Output Format | Non-multiplexed BCD with strobe and polarity signals - simplifies microcontroller or discrete logic readout |
Pinout & Package
ICL7109EPL+ is supplied in a 28-pin plastic dual in-line package (PDIP) with 0.6-inch body width and standard through-hole mounting footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Noninverting analog input | Accepts positive input voltage referenced to IN–; used with external scaling resistors for range adjustment |
| IN– | Inverting analog input | Reference node for differential input; connects to signal ground or negative rail depending on configuration |
| REF+ | Positive reference input | Connects to internal reference divider; sets full-scale range when used with REF– and internal 2.5 V bandgap |
| REF– | Negative reference input | Completes reference path; tied to common for unipolar mode or to IN– for bipolar operation |
| OSC1/OSC2 | Crystal oscillator terminals | Supports external 120 kHz crystal or ceramic resonator; internal oscillator enables self-contained timing |
| STROBE | Data valid output | Active-low pulse indicates BCD data is stable and ready for latching by external logic or MCU |
| POL | Polarity indicator | High = negative input; low = zero or positive - enables signed digit display without software sign interpretation |
| DB0–DB7 | BCD data bus outputs | Non-multiplexed 8-bit BCD (two digits per byte); no external demultiplexing required |
Key Features
| Feature | Design Value |
|---|---|
| On-chip display drivers | Direct drive capability for common-anode 7-segment LEDs reduces component count and PCB space vs. external driver ICs |
| Auto-zero calibration | Performs internal offset nulling before each conversion cycle - eliminates manual trim and improves long-term stability |
| Line-synchronized sampling | Internal timing aligns conversion start with AC line zero-crossing - suppresses 50/60 Hz interference without external sync circuitry |
| Single-supply operation | Operates from +5 V only (with optional –5 V for extended bipolar range); simplifies power design in portable or panel-mounted instruments |
Applications
| Digital Panel Meter | Benchtop Multimeter |
|---|---|
Use Scenario: Front-panel voltage/current measurement in industrial control cabinets with LED readout. IC Role / Device Role / Timing Role: Primary ADC and display controller - digitizes analog sensor output and drives 3-digit LED segments directly. Use Value: Eliminates need for separate BCD decoder and segment driver ICs, reducing bill-of-materials and layout complexity. | Use Scenario: Portable handheld multimeter requiring high noise immunity and stable DC accuracy. IC Role / Device Role / Timing Role: Dual-slope ADC core with integrated zero calibration and polarity detection - handles autoranging and sign indication autonomously. Use Value: ±1 LSB INL and 10 µV/°C drift ensure repeatable measurements across temperature without recalibration. |
| Process Monitor | Calibration Standard |
Use Scenario: Fixed-mount analog signal monitoring in PLC I/O modules with local LED display. IC Role / Device Role / Timing Role: Standalone analog front-end - converts 4–20 mA loop signals (via shunt) and displays scaled engineering units. Use Value: Built-in 2.5 V bandgap reference and auto-zero enable stable readings over 0°C to +70°C without external components. | Use Scenario: Lab-grade reference instrument requiring traceable DC voltage measurement. IC Role / Device Role / Timing Role: Precision DC digitizer with line-synchronized sampling - rejects mains-borne noise during calibration verification. Use Value: Dual-slope architecture delivers <0.01% reading error at 50/60 Hz, meeting Class II portable calibrator requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-slope ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7129CPL+ | Higher resolution (13-bit), improved offset drift (5 µV/°C), but requires external crystal and lacks on-chip display drivers | Suitable for higher-accuracy bench instruments where external decoding is acceptable | Select ICL7129CPL+ only if resolution >3½-digit and lower drift outweigh loss of integrated display support |
| MAX132ACNG+ | Successor sigma-delta ADC with 16-bit resolution, SPI interface, and no native LED drive - requires microcontroller host | Targeted at digitally connected test equipment with firmware-based display management | Choose MAX132ACNG+ when system already includes an MCU and demands >0.001% DC accuracy over wide temperature range |
Compared with ICL7109EPL+, ICL7129CPL+ trades integrated display functionality for higher resolution and lower drift, while MAX132ACNG+ replaces autonomous operation with digital interface flexibility and superior DC specs - neither offers pin-compatible replacement or identical feature set.
Availability
ICL7109EPL+ is available at Aetrix Electronics and suitable for digital panel meters, benchtop multimeters, process monitors, and calibration standards requiring stable component supply and long-lifecycle support.
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) designs precision analog, mixed-signal, and power management ICs for industrial, medical, and test equipment markets.
The ICL7109EPL+ belongs to Maxim's legacy precision ADC product line, engineered specifically for cost-sensitive, self-contained digital metering applications with minimal external components.
FAQ
What is the operating temperature range for the ICL7109EPL+?
The ICL7109EPL+ is rated for operation from 0°C to +70°C. Its 10 µV/°C offset drift specification is guaranteed across this full industrial temperature range, making it suitable for panel-mounted instrumentation deployed in factory environments without active thermal management.
Does the ICL7109EPL+ require an external crystal oscillator?
No - the ICL7109EPL+ includes an internal 120 kHz oscillator that drives its dual-slope conversion timing. External crystals or RC networks are optional and used only when precise external synchronization or frequency tuning is needed; default operation uses the internal oscillator.
Can the ICL7109EPL+ drive common-cathode LED displays?
No - the ICL7109EPL+ output drivers are designed exclusively for common-anode 7-segment LED displays. Its segment outputs sink current and lack high-side drive capability; interfacing to common-cathode displays requires external transistor inverters or level-shifting circuitry.
How does the ICL7109EPL+ handle bipolar input signals?
The ICL7109EPL+ supports bipolar inputs via differential connection between IN+ and IN–, with REF– tied to IN–. This configuration enables full-scale measurement from –2 V to +2 V using the internal 2.5 V reference, and automatically generates the POL output to indicate sign without external logic.
Is the ICL7109EPL+ RoHS compliant?
Yes - the ICL7109EPL+ carries the '+' suffix indicating lead-free, RoHS-compliant packaging per Maxim Integrated's product marking convention. It meets EU Directive 2011/65/EU requirements and is suitable for environmentally regulated industrial and commercial applications.
ICL7109EPL+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- 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:
- 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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