ICL7117CQH - 3.5-Digit Dual-Slope ADC | Maxim Integrated
MPN: ICL7117CQH ✓ AktifICL7117CQH Genel Bakış
An integrating analog-to-digital converter converts an unknown input voltage into elapsed time by charging and discharging an internal integration network. The ICL7117 belongs to the integrating ADC, dual-slope ADC, and precision measurement converter hierarchy. Unlike a successive-approximation ADC, a dual-slope converter rejects a substantial amount of periodic noise and is commonly used with panel meters, laboratory instruments, scales, and industrial measurement equipment.
Principal characteristics include 3.5-digit measurement resolution, a reported 16-bit conversion word, single-channel operation, parallel word access, an integrated reference source, and support for bipolar input signals. The ICL7117 differs from the ICL7116 because it includes a Hold input and directly supports LED displays, whereas the ICL7116 is intended for LCD displays. This distinction makes pin and function compatibility with the ICL7116 unsuitable despite their shared converter heritage.
The internal architecture combines a precision reference, comparator, integrator, timing section, digital counter, and display-driver outputs. Dual-slope conversion repeatedly measures input and reference intervals, producing a result that is effectively proportional to the ratio between the input voltage and the reference voltage. The reported 16-bit parallel output permits a host processor to capture the converted value without reproducing the internal counter timing, while the Hold input can freeze the displayed result during measurement or interface transactions.
Typical uses include digital panel meters, laboratory measurement instruments, process-monitoring equipment, weighing systems, and embedded instrumentation with discrete LED displays. The 6 V to 9 V supply range suits systems that already provide a 9 V rail, while the commercial temperature grade targets indoor laboratory, industrial, and commercial equipment operating between 0 °C and 70 °C.
Designers should pay particular attention to input polarity, reference accuracy, integration timing, display-driver compatibility, and the distinction between the Hold and Digit inputs. Confirm the complete QCCJ pin assignment and board footprint against the manufacturer data sheet before routing a replacement PCB or connecting LED segments.
This product record combines the manufacturer's converter description with package, temperature, interface, and lifecycle information, then adds practical selection guidance and a package-focused comparison for engineers evaluating replacements without requiring a PCB change.
Drop-in alternatifler için ICL7117CQH — aynı paket, pin-başına uyumlu. PCB yeniden montajı gerektiren farklı paket bileşenleri dışlanmıştır.
ICL7117CQH+D
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
ICL7117CQH Maksimum Değerlendirmeler & Elektriksel Özellikler
| ADC Type | Dual-slope integrating ADC |
| Çözünürlük | 3.5 digits |
| Output Word | 16 bit |
| Analog Input Channels | 1 channel |
| Data Interface | Parallel word access |
| Input Type | Bipolar input |
| Reference | Built-in reference source |
| Front End | Low-noise front end |
| Besleme Gerilimi | 6 V to 9 V |
| İşletim Sıcaklığı | 0 °C to 70 °C |
| Temperature Grade | Commercial grade |
| Paket | PLCC-44 (QCCJ) |
| Package Dimensions | 16.6 mm × 16.6 mm |
| Package Shape | Square |
| Terminal Form | J-bend |
| Total Pin Count | 44 pins |
| Montaj Türü | Surface mount |
| Display Output | Direct LED display drive |
| Hold Function | Yes |
| Process Technology | CMOS |
| RoHS Durumu | Compliant |
ICL7117CQH square Pin Yapısı Kılavuzu
ICL7117CQH (square paket) için pin yapısı. Bu analog bileşen, giriş, çıkış ve güç besleme pinleri içerir. Ofset null, telafi ve etkinleştirme pin yapılandırmaları için üretici veri kitapçığını referans alın. Sinyal işleme ve güç amplifikasyon devreleri için mükemmel bir bileşendir.
Ayrıntılı pin çıkış verisi mevcut değil: ICL7117CQH.
Aşağıdaki veri sayfası tam pin konfigürasyonu için.
Tipik Uygulamalar
ICL7117CQH için uygundur 6 uygulamas: Digital Panel Meter, Laboratory Voltage Measurement, Industrial Process Monitor, Bench Weighing Scale, Digital Test and Measurement Readout, Embedded Measurement and Control Interface.
Digital Panel Meter
The ICL7117CQH fits a digital panel meter because it combines a 3.5-digit dual-slope converter with direct seven-segment LED display drive and a Hold input. The single bipolar input channel can monitor a conditioned transducer signal, while the integrated reference and low-noise front end simplify the analog signal chain. Its 6 V to 9 V supply range suits instrument panels built around a 9 V rail. Using the Hold function lets an operator or external controller freeze the displayed measurement during inspection or data capture. The commercial 0 °C to 70 °C rating is appropriate for indoor instruments, provided the display current, input range, and supply tolerances remain within the device specifications.
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Laboratory Voltage Measurement
For laboratory voltage measurement, the ICL7117CQH provides a dual-slope conversion system with a reported 16-bit output word and parallel data access. The 3.5-digit front end is intended for readable meter resolution rather than high-resolution waveform acquisition, but it is effective when the goal is a stable numerical instrument reading. Its low-noise front end and built-in reference simplify conditioning of a bipolar input. The Hold input can freeze the conversion during a measurement cycle, and the LED outputs can provide a local display without a separate display driver. The 6 V to 9 V operating range and 0 °C to 70 °C commercial grade align with typical bench-instrument environments.
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Industrial Process Monitor
The ICL7117CQH can serve as the measurement engine in an industrial process monitor when the input is already scaled to the converter's bipolar range. Its integrating dual-slope architecture is well matched to slowly changing process variables such as temperature, pressure, or position, particularly when periodic interference must be rejected. The integrated reference reduces the number of external precision components, while the parallel word output allows a controller to acquire the measurement electronically. LED drive supports an immediate local readout, and Hold can stabilize that readout during a sample-and-hold interval. The commercial temperature range covers indoor equipment, although enclosure temperature, calibration drift, and input grounding must be evaluated at the system level.
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Bench Weighing Scale
A bench weighing scale can use the ICL7117CQH to convert a bridge-amplifier output into a readable three-and-a-half-digit result. The integrating measurement approach and low-noise front end are useful for slow force measurements where the objective is repeatable display resolution rather than fast sampling. The built-in reference supports the measurement chain, and the parallel word output can also feed a host processor for calibration, unit conversion, or logging. Hold permits the displayed result to remain fixed during tare, data transfer, or operator readout. The 44-pin QCCJ package is intended for surface-mount assembly, and the device's 6 V to 9 V supply range requires a compatible analog rail in the scale electronics.
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Digital Test and Measurement Readout
The ICL7117CQH is appropriate for a dedicated digital readout module that presents a slow-changing measurement directly to an operator. Its direct LED-display drive avoids a separate seven-segment driver when the converter is mounted close to the display, while the 16-bit parallel word provides an optional digital acquisition path. The Hold input can suspend updates while the host reads or records a value. The integrated reference and low-noise front end help organize the signal path for a conditioned analog measurement, and the 3.5-digit format naturally supports panel-meter readability. The commercial temperature rating and surface-mount QCCJ package suit indoor production and service instruments, subject to careful display-current and supply-decoupling layout.
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Embedded Measurement and Control Interface
The ICL7117CQH can bridge a slow analog measurement and a digital control system through its parallel word output. This arrangement is useful when a microcontroller needs a stable numeric value while the same circuit also provides a local LED display for operators. The Hold input allows the controller or operator to freeze the result during sampling, transfer, or alarm handling. Because the converter is a dual-slope integrating ADC rather than a high-speed successive-approximation converter, it is best applied to control variables that do not require rapid updates. The 6 V to 9 V supply range, commercial temperature grade, and 44-pin QCCJ package support a compact measurement daughtercard or mixed-signal controller board.
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Önerilen Ürünler Özeti
Mühendislik referans verileri: ICL7117CQH — karşılaştırma, tasarım rehberi ve uyumluluk bilgileri.
Seçim Kılavuzu
Alternatiflerle Karşılaştırma
| Parametre | Bu Ürün | ICL7117CQH+D |
|---|---|---|
| Package | PLCC-44 (QCCJ) | PLCC-44 (QCCJ) - same package |
| Brand | Maxim Integrated | Maxim Integrated |
| ADC Type | Dual-slope integrating ADC | Dual-slope integrating ADC |
| Resolution | 3.5 digits | 3.5 digits |
| Output Word | 16 bit parallel word access | 16 bit parallel word access |
| Supply Voltage | 6 V to 9 V | 6 V to 9 V |
| Operating Temperature | 0 °C to 70 °C | 0 °C to 70 °C |
| Input Configuration | Single-channel bipolar input | Single-channel bipolar input |
| Display Output | Direct LED display drive with Hold | Direct LED display drive with Hold |
| Assembly Designation | Commercial grade | Lead-free designation |
Ana Farklılayıcılar
- Same-package lead-free substitution path (karşılaştırma:ICL7117CQH+D)
- Direct LED-display architecture (karşılaştırma:ICL7116CPL+)
- Broader local display versus 40-pin DIP alternatives (karşılaştırma:ICL7129ACPL+)
Tasarım Notları
Place the analog input, reference, and supply bypass components close to their corresponding ICL7117CQH pins, and keep digital display-drive and parallel-output routing away from the sensitive input path. The device combines a low-noise analog front end with LED segment outputs, so return-current paths from display drivers should not share the analog-ground region. Follow the package drawing and pin-description table when identifying pin 1 and orienting the 44-pin QCCJ footprint.
Design the analog supply for the stated 6 V to 9 V operating range and verify margin against the complete operating-temperature and tolerance requirements. Place the manufacturer's recommended supply-decoupling capacitor near the supply pins and account for supply ripple at the converter input. Because the same board may also drive LED segments, separate or locally regulate display current so display transitions do not disturb the converter's measurement reference or input node.
Do not treat ICL7116CPL+, ICL7129ACPL+, or MAX7129CPL+ as drop-in replacements: each is identified with a 40-pin DIP package, while ICL7117CQH uses a 44-pin QCCJ package. Also distinguish the LED-display ICL7117 from the LCD-oriented ICL7116 before substitution. Validate the Hold-input polarity, digit outputs, segment outputs, common reference arrangement, and analog input range against the manufacturer data sheet.
Keep the bipolar analog input path short and shield it from LED-driver and parallel-bus switching activity. Use a stable ground reference and decouple supply branches close to their loads rather than routing display current through the analog return. If the source has high source impedance, account for input bias, settling, and integration-cycle requirements; obtain the complete input-impedance and noise characteristics from the manufacturer data sheet before finalizing the source network.
Uyumluluk Bilgisi
RoHS compliance is identified in the product listing. The related ICL7117CQH+D version is described as lead-free, but the exact lead-free status of the base ICL7117CQH MPN requires confirmation.
