ICL7109CPL - 12-Bit ADC Dual-Slide Integrator 40-PDIP | Maxim Integrated
Référence : ICL7109CPL ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $8.2 | $8,20 |
| 10 | $7.65 | $76,50 |
| 100 | $6.85 | $685,00 |
| 500 | $5.95 | $2 975,00 |
| 1 000 | $5.1 | $5 100,00 |
ICL7109CPL Présentation
Key specifications include 12-bit resolution, dual-slope integration architecture with a zero-integrator phase added by Maxim to suppress over-range hangover and crosstalk, low input bias current suitable for direct transducer connection, and CMOS power consumption that allows battery or loop-powered data acquisition. The 3-state binary outputs simplify shared-bus multiplexing when one ADC per channel is preferred over an analog multiplexer.
The ICL7109 uses the dual-slope conversion principle, in which the input signal is integrated over a fixed period and then de-integrated against an external reference voltage. The resulting count is proportional to VIN/VREF, naturally providing excellent normal-mode rejection at the integration period and inherent input integration. Maxim's zero-integrator phase modification eliminates the residual integrator charge that traditionally caused over-range recovery delay and adjacent-channel crosstalk in multiplexed systems.
Typical applications include digital panel meters, weighing scales, industrial process transmitters, remote data acquisition via UART modems, and low-bandwidth precision sensor readouts. The wide common-mode input range and bipolar single-supply operation also suit loop-powered 4-20 mA transmitters and battery-powered instrumentation where CMOS power dissipation is critical.
When designing with this device, choose integration capacitors with low dielectric absorption (polypropylene or NPO ceramic) to minimize linearity error, and place reference, integrator, and auto-zero capacitors close to the analog pins to reduce leakage. Using an external low-drift voltage reference such as the ADR01 or REF02 maximizes absolute accuracy. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not commonly found in condensed vendor listings.
Alternatives de remplacement direct pour ICL7109CPL — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ICL7109CPL+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ICL7109CPLZ
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
TC7109CPL
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ICL7109CPVZ
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ICL7109CPLZ-T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ICL7109CPL Valeurs maximales et caractéristiques électriques
| Résolution | 12 bit |
| Number of Inputs | 1 differential |
| Conversion Method | Dual-slope integrating |
| Fréquence d'échantillonnage | 30 samples/second |
| Architecture | Dual Slope with zero-integrator phase |
| Data Interface | Parallel (3-state binary) |
| Output Format | Binary + polarity + over-range |
| Input Type | Differential |
| Température de fonctionnement | 0 C to +70 C (commercial) |
| Boîtier | 40-PDIP |
| Type de montage | Through-Hole |
| Statut RoHS | Refer to manufacturer product page |
| Polarity Output | Yes |
| Over-range Output | Yes |
Configuration des broches de ICL7109CPL
| Broche 1 | V+ — Positive supply voltage |
| Broche 2 | B12 — Bit 12 (MSB) parallel output, 3-state |
| Broche 3 | B11 — Bit 11 parallel output, 3-state |
| Broche 4 | B10 — Bit 10 parallel output, 3-state |
| Broche 5 | B9 — Bit 9 parallel output, 3-state |
| Broche 6 | B8 — Bit 8 parallel output, 3-state |
| Broche 7 | B7 — Bit 7 parallel output, 3-state |
| Broche 8 | B6 — Bit 6 parallel output, 3-state |
| Broche 9 | B5 — Bit 5 parallel output, 3-state |
| Broche 10 | B4 — Bit 4 parallel output, 3-state |
| Broche 11 | B3 — Bit 3 parallel output, 3-state |
| Broche 12 | B2 — Bit 2 parallel output, 3-state |
| Broche 13 | B1 — Bit 1 (LSB) parallel output, 3-state |
| Broche 14 | POL — Polarity output |
| Broche 15 | OR — Over-range output |
| Broche 16 | MODE — Mode select (Direct/Handshake) |
| Broche 17 | SEN — Status enable |
| Broche 18 | CE — Chip enable |
| Broche 19 | LBEN — Low byte enable (Direct mode) |
| Broche 20 | HBEN — High byte enable (Direct mode) |
| Broche 21 | DGND — Digital ground |
| Broche 22 | OSC OUT — Oscillator output |
| Broche 23 | OSC IN — Oscillator input |
| Broche 24 | OSC SEL — Oscillator select (RC/crystal) |
| Broche 25 | BUF — Buffer output |
| Broche 26 | AZ — Auto-zero capacitor |
| Broche 27 | INT IN — Integrator input |
| Broche 28 | INT OUT — Integrator output |
| Broche 29 | CREF+ — Reference capacitor positive |
| Broche 30 | CREF- — Reference capacitor negative |
| Broche 31 | DE — Differential input |
| Broche 32 | AGND — Analog ground |
| Broche 33 | IN HI — Analog differential input high |
| Broche 34 | IN LO — Analog differential input low |
| Broche 35 | REF HI — Reference voltage high |
| Broche 36 | REF LO — Reference voltage low |
| Broche 37 | COMMON — Analog common |
| Broche 38 | V- — Negative supply |
| Broche 39 | TEST — Test pin (factory use) |
| Broche 40 | V+ — Positive supply (tied to pin 1) |
Applications typiques
ICL7109CPL convient pour 6 applications: Digital Panel Meter Readout, Industrial Weighing Scale Front End, Loop-Powered 4-20 mA Transmitter, Remote UART-Based Data Acquisition, Portable Benchtop Multimeter ADC, Process Control Analog Input Module.
Digital Panel Meter Readout
The ICL7109CPL is well-suited for digital panel meter designs where a single ADC drives one display channel directly. Its 12-bit dual-slope architecture offers excellent inherent 50 Hz/60 Hz normal-mode rejection without external filters, while its CMOS low power operation suits mains-powered or USB-fed meters that must run cool in enclosed instrument housings. The 3-state binary outputs simplify connection to any 8-bit microcontroller that supervises range, min/max, and alarm thresholds.
Recommandé
Industrial Weighing Scale Front End
The ICL7109CPL serves as the A-to-D front end for industrial weighing scale platforms that demand 12-bit resolution and strong normal-mode rejection at power-line frequencies. Its dual-slope conversion directly rejects 50 Hz/60 Hz mains-induced load-cell noise, eliminating the need for additional analog filter stages. The differential input accommodates bridge-type load cells with high common-mode DC offset, and the 30 sample-per-second rate matches the mechanical settling time of typical platform scales.
Recommandé
Loop-Powered 4-20 mA Transmitter
Per the Maxim datasheet, the ICL7109CPL fits loop-powered 4-20 mA transmitter designs because of its CMOS low-quiescent current and single 5 V supply operation. The 12-bit resolution digitizes bridge pressure, temperature, or flow transducers at the head of the loop, while the parallel output interfaces to a low-power microcontroller that drives a current loop DAC back to the control room. The bipolar input range simplifies differential sensor signal conditioning without extra level-shift circuitry.
Recommandé
Remote UART-Based Data Acquisition
The ICL7109CPL supports a Handshake mode that emits the 12-bit conversion result in a UART-compatible serial format, eliminating the need for a local microprocessor in simple remote sensor nodes. Per Maxim datasheet, this mode pairs naturally with RS-232 or RS-485 modems over twisted-pair or radio links for SCADA and environmental monitoring. The CMOS power budget keeps the node within solar or battery-powered budgets where AC mains is unavailable.
Recommandé
Portable Benchtop Multimeter ADC
The ICL7109CPL's 12-bit resolution and dual-slope noise rejection at 50 Hz/60 Hz make it an attractive ADC for portable benchtop multimeter front ends that must measure voltage, current, and resistance with stable display readouts. The differential input simplifies true-RMS or temperature-compensated measurement channels, and the parallel binary output drives a microcontroller that owns range switching, hold, and Min/Max capture functions. Maxim's zero-integrator phase modification eliminates the over-range hangover that traditionally limited dual-slope meters in fast autoranging designs.
Recommandé
Process Control Analog Input Module
The ICL7109CPL fits PLC and DCS analog input modules where one ADC is dedicated per channel rather than multiplexed, leveraging the part's low input bias current and CMOS power budget. Per Maxim, the zero-integrator phase suppresses adjacent-channel crosstalk that plagued earlier integrating ADCs, simplifying analog front-end design. The 12-bit parallel output integrates directly into the module's backplane microcontroller, delivering 30 conversions per second per channel with excellent mains-frequency rejection.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ICL7109CPL — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ICL7109CPL+ | ICL7109CPLZ | TC7109CPL | ICL7109CPVZ | ICL7109CPLZ-T |
|---|---|---|---|---|---|---|
| Package | 40-PDIP | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Microchip Technology | Maxim Integrated | Maxim Integrated |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 30 SPS | 30 SPS | 30 SPS | 30 SPS | 30 SPS | 30 SPS |
| Architecture | Dual-slope with zero-integrator phase | Same | Same | Dual-slope | Same | Same |
| Data Interface | Parallel 3-state binary | Same | Same | Same | Same | Same |
| Input Type | Differential | Differential | Differential | Differential | Differential | Differential |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C |
| RoHS Compliance | Refer to manufacturer page | RoHS-compliant (lead-free) | RoHS-compliant | Refer to Microchip datasheet | RoHS-compliant | RoHS-compliant |
Principaux différenciateurs
- Maxim's zero-integrator phase addition eliminates over-range hangover (vs TC7109CPL)
- Original commercial-grade Maxim silicon with broad second-source ecosystem (vs ICL7109CPL+)
- Microprocessor direct bus interface without glue logic (vs TC7109CPL)
Notes de conception
Estimated: place the integrator capacitor (CINT), auto-zero capacitor (CAZ), and reference capacitor (CREF) within 10 mm of pins 28, 26, and 29-30 respectively. Keep digital return currents (DGND, pin 21) separated from analog return currents (AGND, pin 32) and tie them together at a single star point under the IC. This separation prevents digital switching noise from coupling into the integrator node, which directly degrades conversion linearity.
Per Maxim application guidance, the ICL7109CPL samples the differential input across pins 33 (IN HI) and 34 (IN LO). Series resistors of 50 to 100 ohm placed at these pins combined with the external CREF capacitor form a low-pass filter that dampens RF interference pickup from nearby relay coils or motor drive stages. Without this filtering, common-mode RF can rectify inside the input protection diodes and produce large DC errors at low input levels.
Do not connect the ICL7109CPL digital ground and analog ground at multiple points; the resulting ground loops convert the 30 SPS conversion currents into common-mode errors that degrade effective resolution to 8-10 bits. Also, ensure the oscillator capacitor on pins 22-24 is a low-leakage NPO ceramic rather than a Y5V dielectric, since Y5V capacitance drops 80% at temperature extremes and shifts the integration clock frequency, altering normal-mode rejection notches away from 50 Hz/60 Hz.
Per the Maxim datasheet, the ICL7109CPL operates from a single +5 V supply on pin 1 with optional negative supply on pin 38 for bipolar input ranges. Bypass pin 1 with 10 uF tantalum in parallel with 0.1 uF ceramic placed within 5 mm of the package. When using bipolar input, the negative supply current is typically 1-2 mA, so a charge-pump inverter such as the ICL7660 is sufficient for low-power designs instead of a dedicated -5 V rail.
Informations de conformité
Compliance details must be verified on the manufacturer product page; the ICL7109CPL+ variant is documented as RoHS-compliant per Maxim, while the original ICL7109CPL finish is reference-by-supplier.
