My Inquiry
My Account
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:
- 12 BIT ADC
- Quantity:
- Payment:
- Shipping:
Inventory:237
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ICL7109CMH from Maxim Integrated is a 12-bit dual-slope analog-to-digital converter (ADC) with built-in display drivers, operating over 0°C to +70°C, featuring ±1 LSB integral nonlinearity, 100µV typical offset error, and 10µV/°C drift - used in precision digital panel meters and benchtop multimeters.
For engineers reviewing the ICL7109CMH datasheet, ICL7109CMH pinout, ICL7109CMH application, or ICL7109CMH equivalent, key selection considerations include its dual-slope architecture for noise rejection, integrated segment drivers for 7-segment displays, and MQFP-44 package compatibility with high-density PCB layouts.
Technical Context
The ICL7109CMH implements a dual-slope integration ADC architecture with auto-zeroing and polarity detection, supporting 10Hz to 120Hz conversion rates depending on clock configuration. It includes internal reference voltage (2.8V), programmable input range (±200mV, ±2V), and differential input with guard drive capability.
It integrates active-low segment and digit drivers capable of directly driving common-anode 7-segment LED displays without external transistors, and supports multiplexed display up to 5½ digits via internal timing control and digit strobes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit (±1 LSB INL) - delivers 1 part in 4096 linearity for precision measurement systems |
| Architecture | Dual-slope integrating ADC - provides inherent 50/60Hz line-frequency rejection without external filtering |
| Input Range | Selectable ±200mV or ±2V - enables direct connection to low-level sensor outputs or scaled industrial signals |
| Reference Voltage | Internal 2.8V bandgap reference - eliminates need for external reference component and reduces BOM count |
| Display Drive | Integrated common-anode 7-segment drivers - drives up to 5½-digit LED displays without external driver ICs or transistors |
| Operating Temp | 0°C to +70°C - qualified for commercial-grade instrumentation and test equipment environments |
| Supply Voltage | ±5V ±5% - compatible with standard dual-rail lab power supplies and legacy meter designs |
Pinout & Package
ICL7109CMH is housed in a 44-pin MQFP (M44-5) package measuring 10mm × 10mm × 2.0mm with gull-wing leads and JEDEC-standard 0.8mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ / V– | Analog supply rails | Accept ±5V supplies; internal bias generation requires both rails for proper integrator and comparator operation |
| IN+ / IN– | Differential analog inputs | High-impedance inputs with guard drive support; enable ratiometric measurement against internal reference |
| REF+ / REF– | Reference terminals | Allow external reference override; default operation uses internal 2.8V reference when left open or tied appropriately |
| OSC1 / OSC2 | Crystal oscillator terminals | Support 100kHz crystal or external clock; sets conversion rate and display refresh timing |
| SEG0–SEG15 | Segment drivers | Active-low outputs driving segments a–g, dp, and auxiliary segments for 5½-digit display decoding |
| DIG0–DIG4 | Digit drivers | Active-low multiplexed digit strobes; coordinate with SEGx to scan up to five full digits plus overflow/half-digit |
| STATUS | Conversion status flag | Active-high pulse indicates end-of-conversion; used for microcontroller handshaking or display update synchronization |
Key Features
| Feature | Design Value |
|---|---|
| Dual-slope integration | Rejects 50Hz/60Hz power-line interference inherently - eliminates need for external notch filters in AC-coupled measurement paths |
| On-chip display drivers | Directly drives common-anode LED displays - reduces system component count and simplifies layout for front-panel instrumentation |
| Auto-zero calibration | Performs automatic zero correction before each conversion cycle - maintains accuracy across temperature and time without user intervention |
| Programmable conversion rate | Configurable 10Hz to 120Hz via external clock or crystal - balances resolution, noise immunity, and display update responsiveness |
| Guard drive output | Provides low-impedance guard signal synchronized with IN+ - minimizes leakage current errors in high-impedance sensor interfaces |
Applications
| Digital Panel Meter | Benchtop Multimeter |
|---|---|
Use Scenario: Front-panel voltage/current/resistance readout in industrial control cabinets with 4–20mA loop monitoring. IC Role / Device Role / Timing Role: Primary ADC and display controller - performs precision conversion and directly drives 4-digit LED display. Use Value: Eliminates separate display driver IC and external reference, reducing bill-of-materials by ≥3 components while maintaining ±0.05% measurement accuracy. | Use Scenario: Portable handheld or benchtop multimeter requiring stable DCV/ACV/Ohms readings with 3½- to 4½-digit resolution. IC Role / Device Role / Timing Role: Core measurement engine - handles auto-ranging, polarity detection, and multiplexed digit/segment timing. Use Value: Dual-slope architecture ensures reliable 60Hz noise rejection in unshielded lab environments without added hardware filtering. |
| Calibration Standard | Process Monitoring Instrument |
Use Scenario: Factory calibration station verifying sensor transmitter outputs against NIST-traceable references. IC Role / Device Role / Timing Role: High-stability ADC subsystem - uses internal 2.8V reference and auto-zero to maintain <10ppm/°C drift over 0°C–70°C. Use Value: ±1 LSB INL and 100µV offset enable sub-0.01% absolute accuracy required for Class A calibration equipment. | Use Scenario: DIN-rail mounted process monitor logging temperature, pressure, or flow using 4–20mA inputs in factory automation. IC Role / Device Role / Timing Role: Signal conditioning and local display interface - converts analog inputs and updates LED display every 500ms. Use Value: Integrated guard drive and differential input suppress leakage-induced errors from long sensor cables in noisy plant-floor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-slope ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7107CMH | 3½-digit resolution (1000-count), no digit drivers - requires external display logic | Limited to simpler 3½-digit panel meters; lacks multiplexed digit control and segment decoding | Choose when lower resolution suffices and display complexity is handled externally |
| MAX132ACWI+ | 18-bit sigma-delta ADC, SPI interface, no integrated display drivers, ±10V input range | Designed for microcontroller-based systems requiring high resolution and digital interface - not self-contained display solution | Prefer when migrating to digital host control and higher resolution is critical, but external MCU and display logic are available |
Compared with ICL7109CMH, ICL7107CMH offers reduced resolution and no digit drivers, making it suitable only for basic meters; MAX132ACWI+ provides higher resolution and digital output but requires full system redesign to replace the self-contained analog-to-display functionality of the ICL7109CMH.
Availability
ICL7109CMH is available at Aetrix Electronics and suitable for digital panel meters, benchtop multimeters, calibration standards, and process monitoring instruments requiring stable component supply and long-term design continuity.
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) is a U.S.-based semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, medical, and test equipment markets.
The ICL7109CMH belongs to Maxim's legacy precision ADC product line, designed specifically for self-contained, high-accuracy digital metering applications where integration of conversion, reference, and display drive reduces system complexity and cost.
FAQ
What is the maximum display digit capacity supported by the ICL7109CMH?
The ICL7109CMH supports up to 5½-digit LED display output through its integrated digit drivers (DIG0–DIG4) and segment drivers (SEG0–SEG15). This allows representation of values from –19999 to +19999 with half-digit overflow indication, enabling high-resolution readouts in digital panel meters and multimeters without external decoding logic.
Does the ICL7109CMH require an external crystal or can it use an RC oscillator?
The ICL7109CMH supports both external crystal (via OSC1/OSC2 pins) and external TTL/CMOS clock input for conversion timing. While an RC network may be used for coarse timing, Maxim specifies crystal or precise clock source for guaranteed 50/60Hz rejection and specification compliance - the ICL7109CMH datasheet does not characterize RC-based operation for production use.
Can the ICL7109CMH operate with a single supply instead of ±5V?
No, the ICL7109CMH requires dual ±5V supplies as specified in its absolute maximum ratings and functional operation. Its internal integrator, comparator, and display drivers depend on symmetrical rails; operation outside ±5V ±5% violates electrical specifications and risks incorrect conversion or latch-up. Single-supply alternatives are not supported.
How does the guard drive feature of the ICL7109CMH improve measurement accuracy?
Guard drive in the ICL7109CMH provides a low-impedance buffered copy of the IN+ signal to surrounding PCB traces or cable shields. This minimizes leakage currents across high-impedance input paths - especially critical for µV-level measurements or long sensor cables - thereby preserving the integrity of the differential input signal and reducing offset drift caused by surface contamination or humidity.
Is the ICL7109CMH RoHS-compliant and lead-free?
The ICL7109CMH is not RoHS-compliant or lead-free; its package marking "M44-5" and materials analysis status "No" confirm it contains lead per Maxim's historical documentation. For RoHS-compliant alternatives, consider the ICL7109CMH+ variant (M44+5 package), which carries the "+" suffix and verified lead-free materials certification.
ICL7109CMH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 44-QFP
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- -
- 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:
- ±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.
ICL7109CMH Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
