AD7657YSTZ-REEL - 14-Bit 6-Ch 250 kSPS Bipolar ADC | Analog Devices
MPN: AD7657YSTZ-REEL ✓ Hoạt độngAD7657YSTZ-REEL Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho AD7657YSTZ-REEL — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với AD7657YSTZ-REEL (cùng hình factor và footprint) — khác nhau ở Architecture, Input Type, Input Voltage Ranges, Package, Resolution.
AD7656YSTZ-1-RL
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Xem tài liệu →AD7658YSTZ
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AD7657YSTZ-1
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AD7656YSTZ-1-RL
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AD7657YSTZ-REEL Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 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) |
| Điện áp cung cấp | 5 V |
| Nhiệt độ hoạt động | -40C to +125C (automotive grade) |
| Hộp | 64-LQFP (10x10 mm, ST suffix) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Screening Level | Automotive |
| Process Technology | iCMOS (industrial CMOS) |
| Giao diện | 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 |
Hướng dẫn cấu hình chân AD7657YSTZ-REEL 64-lqfp (10x10 mm, st suffix)
Cấu hình chân cho AD7657YSTZ-REEL (64-lqfp (10x10 mm, st suffix) gói). Thành phần số hiệu này có chân đầu vào, đầu ra và nguồn cung cấp. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết cấu hình chân bù, bù trừ và chân kích hoạt. Hoàn hảo cho điều kiện tín hiệu và mạch khuếch đại.
Không có dữ liệu chân cụ thể sẵn có cho AD7657YSTZ-REEL.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
AD7657YSTZ-REEL phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7657YSTZ-REEL — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Six true simultaneous-sampling SAR ADCs in a single package (vsAD7265BCPZ-REEL (2-channel))
- Automotive-grade -40C to +125C temperature rating (vsAD7657BSTZ-REEL (industrial -40C to +85C))
- Family upgrade/downgrade path within identical LQFP-64 footprint (vsAD7265BCPZ-REEL (LFCSP-32, different package))
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
