AD7657YSTZ-REEL - 14-Bit 6-Ch 250 kSPS Bipolar ADC | Analog Devices
MPN: AD7657YSTZ-REEL ✓ AktifAD7657YSTZ-REEL Genel Bakış
A successive-approximation ADC is a converter architecture that uses a binary-search algorithm against an internal precision DAC to digitize an analog input in N clock cycles, where N is the resolution. SAR ADCs are prized for their deterministic latency, lack of pipeline delay, and excellent DC accuracy, which is why they dominate multi-channel data-acquisition front ends where phase coherence between channels matters. The AD7657's six independent SAR cores, paired with three CONVST pins, allow simultaneous sampling of three ADC pairs - a critical capability for three-phase power, motor control and vibration analysis.
The bipolar +/-10V input range, single 5V supply, low power consumption at 250 kSPS and simultaneous sampling across six channels make this ADC ideal for industrial automation, motor control, multi-axis vibration monitoring and power-line monitoring. The high-speed parallel and serial interface can be connected to microprocessors or DSPs without external signal conditioning.
When designing with the AD7657, pay close attention to the analog input anti-alias filter: each of the six channels requires its own RC network sized for the desired input bandwidth. Also note that the bipolar input range is achieved by on-chip attenuation and level shifting, so the source impedance must remain below the value recommended by the datasheet to preserve linearity.
Drop-in alternatifler için AD7657YSTZ-REEL — aynı paket, pin-başına uyumlu. PCB yeniden montajı gerektiren farklı paket bileşenleri dışlanmıştır.
Bu Serideki Variantlar
Yedek parça uyumlu olan aynı serideki modeller AD7657YSTZ-REEL (aynı form faktörü ve ayağa oturma) — farklı olan Architecture, Input Type, Input Voltage Ranges, Package, Resolution.
AD7656YSTZ-1-RL
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →AD7658YSTZ
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
AD7657YSTZ-1
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
AD7656YSTZ-1-RL
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →AD7657BSTZ-REEL
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
AD7657YSTZ-REEL Maksimum Değerlendirmeler & Elektriksel Özellikler
| Çözünürlük | 14 bits |
| Number of Channels | 6 |
| Architecture | SAR (successive approximation) |
| Throughput | 250 kSPS per channel |
| Input Type | True bipolar, single-ended per channel |
| Input Voltage Ranges | +/-5 V, +/-10 V, 0-5 V, 0-10 V (pin-/software-selectable) |
| Besleme Gerilimi | 5 V |
| İşletim Sıcaklığı | -40C to +125C (automotive grade) |
| Paket | 64-LQFP (10x10 mm, ST suffix) |
| Montaj Türü | Surface Mount |
| RoHS Durumu | Compliant |
| Screening Level | Automotive |
| Process Technology | iCMOS (industrial CMOS) |
| Arayüz | Parallel / Serial (SPI/QSPI/MICROWIRE-compatible) |
| Simultaneous Sampling | Yes (3 CONVST pins for 3 ADC pairs) |
| Reel Orientation | REEL suffix - 7-inch tape and reel |
AD7657YSTZ-REEL 64-lqfp (10x10 mm, st suffix) Pin Yapısı Kılavuzu
AD7657YSTZ-REEL (64-lqfp (10x10 mm, st suffix) 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: AD7657YSTZ-REEL.
Aşağıdaki veri sayfası tam pin konfigürasyonu için.
Tipik Uygulamalar
AD7657YSTZ-REEL için uygundur 6 uygulamas: Three-Phase Power Monitoring, Motor Control and Industrial Drives, Multi-Axis Condition Monitoring / Vibration Analysis, Data Acquisition Systems / Instrumentation, Medical Patient Monitoring and Diagnostic Equipment, Industrial Process Control / PLC Analog Input Modules.
Three-Phase Power Monitoring
The AD7657YSTZ-REEL's six independent SAR ADCs and 3 CONVST pins enable true simultaneous sampling of three-phase voltage and current pairs, capturing phase-coherent waveforms critical for power-quality analyzers and smart meters. With 14-bit resolution and bipolar +/-10V input ranges that accept 230V/400V mains via resistor dividers and current shunts directly, no external signal conditioning is needed. Throughput of 250 kSPS per channel supports harmonic analysis up to the 63rd order at 50/60 Hz. The 64-LQFP package and single 5V supply simplify integration into industrial PLC and meter designs.
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Motor Control and Industrial Drives
Variable-frequency drives and servo amplifiers require six simultaneous-sampled channels to read the three-phase inverter output currents and DC-bus voltage in phase. The AD7657YSTZ-REEL's 250 kSPS per channel captures PWM-edge events with deterministic SAR latency (no pipeline delay), avoiding the aliasing artifacts that plague pipeline ADCs in PWM environments. Bipolar +/-10V inputs accept Hall-effect current-sensor outputs directly, and the automotive -40C to +125C rating survives under-the-hood industrial environments. Industrial automation and CNC machinery are the primary deployment scenarios.
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Multi-Axis Condition Monitoring / Vibration Analysis
Predictive-maintenance systems on pumps, fans and bearings use 3-axis accelerometers on multiple measurement points, often 6 channels total. The AD7657YSTZ-REEL's simultaneous sampling preserves phase relationships between accelerometer axes, enabling accurate FFT-based frequency analysis and bearing-fault diagnosis. With 250 kSPS per channel, the part captures vibration frequencies well above the 10 kHz mechanical range needed for bearing diagnostics, with 14-bit dynamic range sufficient for envelope analysis. IEPE/charge-amplifier outputs can drive the bipolar inputs directly after scaling.
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Data Acquisition Systems / Instrumentation
Multi-channel data-acquisition cards for test equipment and laboratory instrumentation need simultaneous sampling to capture transient events. The AD7657YSTZ-REEL delivers six simultaneously-sampled channels at 250 kSPS each in a compact 64-LQFP, with parallel and serial interfaces to host FPGAs or DSPs. Its bipolar input ranges accept +/-10V sensor outputs directly, eliminating external conditioning, while the SAR architecture provides zero-latency conversion ideal for transient capture and triggered acquisition. Modular PXI and LXI data acquisition systems commonly integrate this part.
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Medical Patient Monitoring and Diagnostic Equipment
Patient monitors measuring ECG, EEG, SpO2, blood pressure and respiration often require multi-channel, phase-coherent analog acquisition for accurate waveform analysis. The AD7657YSTZ-REEL's six channels with simultaneous sampling enable synchronized capture of multi-lead ECG and EEG signals, while the 14-bit resolution and bipolar inputs simplify front-end design for biopotential electrodes. The deterministic SAR latency eliminates the inter-channel skew that pipeline ADCs introduce, which is critical for accurate heart-rate-variability analysis.
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Industrial Process Control / PLC Analog Input Modules
Programmable Logic Controller (PLC) analog-input modules need 4-8 channels of bipolar industrial signal acquisition in a compact footprint. The AD7657YSTZ-REEL delivers six channels of simultaneous-sampled 14-bit conversion in a 64-LQFP, accepting +/-10V, +/-5V, 4-20 mA (via shunt) and 0-10V industrial signals without external level shifting. Automotive-grade temperature rating (-40C to +125C) and the 5V supply simplify integration into factory-floor PLC backplanes. The part's iCMOS process provides the high-voltage bipolar input tolerance required for industrial signal standards.
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Önerilen Ürünler Özeti
Mühendislik referans verileri: AD7657YSTZ-REEL — karşılaştırma, tasarım rehberi ve uyumluluk bilgileri.
Seçim Kılavuzu
Alternatiflerle Karşılaştırma
| Parametre | Bu Ürün | AD7656YSTZ | AD7658YSTZ | AD7657YSTZ-1 | AD7656YSTZ-1-RL | AD7657BSTZ-REEL |
|---|---|---|---|---|---|---|
| Package | LQFP-64 (10x10) | LQFP-64 (10x10) - same | LQFP-64 (10x10) - same | LQFP-64 (10x10) - same | LQFP-64 (10x10) - same | LQFP-64 (10x10) - same |
| Brand | Analog Devices | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same |
| Resolution | 14 bits | 16 bits | 12 bits | 14 bits | 16 bits | 14 bits |
| Number of Channels | 6 | 6 | 6 | 6 | 6 | 6 |
| Throughput | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS |
| Input Voltage Range | +/-5 V, +/-10 V, 0-5 V, 0-10 V | +/-5 V, +/-10 V, 0-5 V, 0-10 V | +/-5 V, +/-10 V, 0-5 V, 0-10 V | +/-5 V, +/-10 V, 0-5 V, 0-10 V | +/-5 V, +/-10 V, 0-5 V, 0-10 V | +/-5 V, +/-10 V, 0-5 V, 0-10 V |
| Operating Temperature | -40C to +125C (auto) | -40C to +125C (auto) | -40C to +125C (auto) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) |
| Decoupling Requirements | Full (standard) | Full | Full | Reduced | Reduced | Full |
| Unit Price (qty-1, approx) | $16.45 | $18.90 (16-bit, ~+15%) | $13.20 (12-bit, ~-20%) | $15.10 | $17.50 | $14.95 |
Ana Farklılayıcılar
- Six true simultaneous-sampling SAR ADCs in a single package (karşılaştırma:AD7265BCPZ-REEL (2-channel))
- Automotive-grade -40C to +125C temperature rating (karşılaştırma:AD7657BSTZ-REEL (industrial -40C to +85C))
- Family upgrade/downgrade path within identical LQFP-64 footprint (karşılaştırma:AD7265BCPZ-REEL (LFCSP-32, different package))
Tasarım Notları
Each of the six analog input channels requires a dedicated anti-alias RC filter sized for the desired input bandwidth. A typical starting value is 1 kohm in series with 1 nF, giving a 159 kHz -3 dB cutoff well above the 250 kSPS Nyquist limit. Place input filter components as close as possible to the AVIN pins, and route the analog inputs over a continuous ground plane to avoid noise coupling from the digital interface signals.
The AD7657YSTZ-REEL requires careful power-supply decoupling: per the datasheet, each AVDD and DVDD pin needs a 10 uF tantalum capacitor plus a 100 nF ceramic capacitor in parallel. For designs that cannot accommodate the full decoupling, the AD7657YSTZ-1 variant reduces these requirements while keeping the same pinout. Place decoupling capacitors within 5 mm of each supply pin and use separate analog and digital ground planes joined at a single point.
The bipolar +/-10V input range is achieved by on-chip attenuation and level shifting from a 5V supply; this means source impedance must remain below the value listed in the datasheet (typically 50 ohm) to preserve linearity. Source impedances above this limit cause gain error and distortion, especially at high channel count. Also note that the parallel and serial interfaces share pins - configure IF_SEL correctly before power-up to avoid bus conflicts, and respect the t_QUIET time before the next CONVST edge.
Estimated: at full 250 kSPS throughput across all six channels, the AD7657 typically dissipates approximately 200-250 mW. The 64-LQFP (10x10 mm) package has a thermal resistance around 50 C/W (theta_JA), giving a junction temperature rise of 10-12 C above ambient at full load. This is well within the -40C to +125C operating range, but adequate PCB copper pour on exposed thermal pads (if any) is still recommended to keep the junction temperature low in enclosed industrial enclosures.
Uyumluluk Bilgisi
RoHS compliant per Analog Devices product page. Lead-free assembly (SnPb-free) indicated by 'Y' in part number. Screening level: Automotive (-40C to +125C) per digchip.com listing. AEC-Q100 not separately qualified for this generic family designation.
