AD7690BCPZRL7 - 18-Bit 400kSPS PulSAR ADC | Analog Devices
MPN: AD7690BCPZRL7 ✓ AktifAD7690BCPZRL7 Genel Bakış
An ADC (analog-to-digital converter) is an electronic component that converts a continuous analog voltage into a discrete digital representation. SAR ADCs use a binary search algorithm to approximate the input voltage, balancing speed and resolution. The AD7690 belongs to the PulSAR family, known for low power consumption and high accuracy, and is part of the broader class of data converters used in signal processing chains.
Key features include 18-bit resolution with no missing codes, integral nonlinearity (INL) of ±0.75 LSB typical and ±1.5 LSB maximum (±6 ppm of FSR), and a dynamic range that scales with throughput. The device supports daisy-chaining via the SDI input, allowing multiple ADCs on a single 3-wire bus, and includes an optional busy indicator. It is compatible with 1.8V, 2.5V, 3V, or 5V logic through a separate VIO supply.
The AD7690 uses a low-power, high-speed 18-bit sampling ADC architecture with an internal conversion clock, eliminating the need for external clocking. The power consumption scales linearly with throughput, enabling efficient operation in battery-powered systems. The differential input provides excellent common-mode rejection, and the device is specified from 4.75V to 5.25V.
Typical applications include precision data acquisition systems, medical instrumentation, industrial process control, and vibration analysis. The high resolution and low noise make it ideal for sensor interfaces where accuracy is critical. The small LFCSP package saves board space, and the SPI interface simplifies connection to microcontrollers and DSPs.
When designing with the AD7690, ensure a clean, low-noise analog supply and proper decoupling. The reference input should be driven by a low-impedance source, and the layout should minimize parasitic capacitance on the analog inputs to maintain specified performance.
Drop-in alternatifler için AD7690BCPZRL7 — aynı paket, pin-başına uyumlu. PCB yeniden montajı gerektiren farklı paket bileşenleri dışlanmıştır.
Bu Serideki Variantlar
Yedek parça uyumlu olan aynı serideki modeller AD7690BCPZRL7 (aynı form faktörü ve ayağa oturma) — farklı olan Sampling Rate, Input Type, Package, Supply Voltage, Resolution.
AD7691BCPZRL7
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AD7982BCPZ-RL7
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AD7687BCPZRL7
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AD7688BCPZRL7
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AD7690BCPZRL7 Maksimum Değerlendirmeler & Elektriksel Özellikler
| Çözünürlük | 18 bits |
| Ölçekleme Oranı | 400 kSPS |
| Number of Inputs | 1 |
| Input Type | Differential |
| Data Interface | SPI, DSP, MICROWIRE, QSPI |
| Architecture | SAR |
| INL (Tamamlayıcı非线性) | ±0.75 LSB typ, ±1.5 LSB max (±6 ppm of FSR) |
| Besleme Gerilimi | 4.75 V to 5.25 V |
| Logic Supply Voltage (VIO) | 1.8 V to 5 V |
| Paket | 10-LFCSP-WD (3x3 mm) |
| İşletim Sıcaklığı Aralığı | -40°C to +125°C |
| Daisy-Chain Support | Yes (via SDI) |
| Busy Indicator | Optional |
| RoHS Durumu | Compliant |
AD7690BCPZRL7 Pin Yapısı
| Pin 1 | IN+ — Positive analog input |
| Pin 2 | IN- — Negative analog input |
| Pin 3 | GND — Ground |
| Pin 4 | VDD — Power supply (5V) |
| Pin 5 | VIO — Logic supply (1.8V to 5V) |
| Pin 6 | SDI — Serial data input (daisy-chain) |
| Pin 7 | SDO — Serial data output |
| Pin 8 | SCK — Serial clock input |
| Pin 9 | CNV — Convert input (start conversion) |
| Pin 10 | REF — Reference voltage input |
Tipik Uygulamalar
AD7690BCPZRL7 için uygundur 6 uygulamas: Precision Data Acquisition Systems, Medical Instrumentation, Industrial Process Control, Vibration Analysis, Battery-Powered Portable Devices, Audio and Acoustic Measurement.
Precision Data Acquisition Systems
The AD7690BCPZRL7's 18-bit resolution and 400 kSPS sampling rate make it ideal for high-accuracy data acquisition systems. Its differential input rejects common-mode noise, ensuring precise measurement of sensor signals. The SPI interface simplifies connection to microcontrollers, and the small LFCSP package saves board space. With an INL of ±1.5 LSB max, it delivers excellent linearity for industrial and laboratory equipment.
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Medical Instrumentation
In medical devices like patient monitors and diagnostic equipment, the AD7690BCPZRL7 provides high-resolution conversion of biosignals. Its low power consumption, which scales with throughput, is critical for battery-operated devices. The 18-bit resolution ensures accurate detection of small physiological signals, while the wide operating temperature range (-40°C to +125°C) supports reliable operation in clinical environments. The compact LFCSP package enables miniaturized designs.
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Industrial Process Control
The AD7690BCPZRL7 excels in industrial process control where precision and reliability are paramount. Its differential input and high common-mode rejection make it robust against electrical noise in factory environments. The 400 kSPS throughput allows real-time monitoring of fast-changing process variables. With an operating temperature range of -40°C to +125°C, it withstands harsh industrial conditions. The SPI interface integrates easily with industrial microcontrollers and PLCs.
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Vibration Analysis
For vibration monitoring and analysis, the AD7690BCPZRL7 offers the high resolution and speed needed to capture dynamic signals. Its 18-bit resolution provides a wide dynamic range, essential for detecting subtle vibrations. The 400 kSPS sampling rate captures high-frequency components accurately. The differential input reduces interference from electromagnetic sources, ensuring clean data. The small package allows integration into compact sensor nodes for predictive maintenance.
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Battery-Powered Portable Devices
The AD7690BCPZRL7's power consumption scales linearly with throughput, making it ideal for battery-powered portable devices. At lower sampling rates, power dissipation decreases, extending battery life. The 1.8V to 5V logic interface allows direct connection to low-power microcontrollers. The compact LFCSP package and wide temperature range support portable and wearable designs. Its high resolution ensures accurate measurements in energy-constrained applications.
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Audio and Acoustic Measurement
In audio and acoustic measurement systems, the AD7690BCPZRL7 provides high-resolution conversion of analog audio signals. Its 18-bit resolution and low noise ensure accurate representation of sound waveforms. The differential input helps reject common-mode noise in audio lines. The 400 kSPS sampling rate is sufficient for high-frequency acoustic analysis. The SPI interface allows easy integration with digital signal processors for real-time audio processing.
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Önerilen Ürünler Özeti
Mühendislik referans verileri: AD7690BCPZRL7 — karşılaştırma, tasarım rehberi ve uyumluluk bilgileri.
Seçim Kılavuzu
Alternatiflerle Karşılaştırma
| Parametre | Bu Ürün | AD7690BRMZ-RL7 | AD7691BCPZRL7 | AD7982BCPZ-RL7 | AD7687BCPZRL7 |
|---|---|---|---|---|---|
| Package | 10-LFCSP-WD (3x3) | 10-MSOP | 10-LFCSP-WD (3x3) | 10-LFCSP-WD (3x3) | 10-LFCSP-WD (3x3) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 18 bits | 18 bits | 18 bits | 18 bits | 16 bits |
| Sampling Rate | 400 kSPS | 400 kSPS | 250 kSPS | 1 MSPS | 250 kSPS |
| Input Type | Differential | Differential | Differential | Differential | Differential |
| INL (max) | ±1.5 LSB | ±1.5 LSB | ±1.5 LSB | ±1.5 LSB | ±1.5 LSB |
| Supply Voltage | 4.75V to 5.25V | 4.75V to 5.25V | 4.75V to 5.25V | 4.75V to 5.25V | 4.75V to 5.25V |
| Daisy-Chain Support | Yes | Yes | Yes | Yes | Yes |
Ana Farklılayıcılar
- 18-bit resolution with no missing codes (karşılaştırma:AD7687BCPZRL7 (16-bit))
- 400 kSPS sampling rate (karşılaştırma:AD7691BCPZRL7 (250 kSPS))
- Compact LFCSP package (karşılaştırma:AD7690BRMZ-RL7 (MSOP))
Tasarım Notları
The AD7690BCPZRL7 requires a clean 5V analog supply (VDD) and a separate logic supply (VIO) for the digital interface. Use low-dropout regulators with low output noise to power VDD, and decouple with 10uF and 0.1uF capacitors close to the pins. The VIO supply can be 1.8V, 2.5V, 3V, or 5V, matching the host microcontroller's logic level.
For optimal performance, place the AD7690BCPZRL7 close to the signal source and keep analog input traces short and shielded. Use a solid ground plane and separate analog and digital ground areas, connecting them at a single point. Decouple the REF pin with a low-impedance capacitor, such as 10uF, to maintain reference stability. Avoid routing digital signals near the analog inputs to prevent coupling.
A common mistake is driving the REF pin with a high-impedance source, which can degrade accuracy. Use a low-impedance reference buffer or a precision reference like the ADR4525. Also, ensure the input signals are within the specified common-mode range to avoid saturation. Finally, do not exceed the absolute maximum ratings on VDD or VIO, as this can damage the device.
Uyumluluk Bilgisi
RoHS compliance is indicated by the 'RL7' suffix (lead-free). Other compliance details not specified in the provided data.