AD7666ACPZRL - 16-Bit 500kSPS SAR ADC w/ Ref | Analog Devices
MPN: AD7666ACPZRL ✓ Hoạt độngAD7666ACPZRL Tóm tắt
A SAR ADC (Successive Approximation Register analog-to-digital converter) is a type of data converter that uses a binary search algorithm and an internal DAC to digitize an analog input one bit at a time per conversion cycle. SAR ADCs are valued for low latency, deterministic behavior, and zero pipeline delay, placing them in the data-converter hierarchy between flash converters (fastest, lowest resolution) and delta-sigma ADCs (highest resolution, slower). The AD7666 sits within Analog Devices' PulSAR precision data-converter family.
Key features of the AD7666ACPZRL include a 2.5 V internal reference with 3 ppm/C typical drift and 15 ppm/C guaranteed maximum drift, INL of +/-2.0 LSB max (+/-0.0038% of full scale), throughput of 500 kSPS, and support for both serial and 16-bit parallel digital outputs. The on-chip reference eliminates the need for an external reference IC, simplifying BOM and reducing board area in multi-channel systems.
Architecture is based on a charge-redistribution CDAC, a high-bandwidth track-and-hold, and an internal precision reference. The part operates from a single 5 V analog supply, supports analog inputs of 0 to VREF, and offers flexible digital interfaces (parallel/serial) controlled by hardware pins. The exposed die-lath pad on the 48-LFCSP-VQ package provides a low-thermal-resistance path for high-throughput continuous conversion.
Typical applications include industrial process control, data acquisition systems, medical instrumentation front-ends, and spectrum analyzer IF digitizers. The integrated reference and 16-bit true resolution make it well suited for precision measurement where DC accuracy and AC dynamic performance both matter.
When designing with this device, follow Analog Devices' reference layout for the exposed die-lath. Place the input buffer amplifier close to the analog input pins, decouple AVDD and DVDD independently, and route the reference decoupling capacitor directly to the REFCAP pin to achieve datasheet INL performance.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, including data internal pin numbers and conversion-rate trade-offs versus pin-compatible peers.
Bộ thay thế dễ dàng lắp đặt cho AD7666ACPZRL — 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 AD7666ACPZRL (cùng hình factor và footprint) — khác nhau ở Operating Temperature, Package, Architecture, Data Interface, Input Type.
AD7666ACPZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7666ASTZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7667ACPZRL
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
AD7650ACPZRL
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD7641BCPZRL
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD7621ACPZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8482IBRGZR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD7666ACPZRL Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 16 bits |
| Architecture | SAR (Successive Approximation) |
| Number of Inputs | 1 |
| Tỷ lệ lấy mẫu | 500 kSPS |
| Input Type | Unipolar, single-ended |
| Internal Reference | 2.5 V |
| Reference Drift (typ) | 3 ppm/C |
| Reference Drift (max) | 15 ppm/C |
| INL (max) | +/-2.0 LSB (+/-0.0038% FS) |
| Data Interface | Parallel (16-bit) / Serial |
| Analog Supply | 5 V |
| Nhiệt độ hoạt động | -40C to +125C |
| Hộp | 48-LFCSP-VQ (7x7 mm) with EP |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Input Range | 0 V to VREF |
| Trạng thái RoHS | Compliant |
Cấu hình chân AD7666ACPZRL
| Chân 1 | AVDD — Analog supply (5V) |
| Chân 2 | AGND — Analog ground |
| Chân 3 | IN+ — Analog input positive |
| Chân 4 | IN- — Analog input negative / ground-sense |
| Chân 5 | REFCAP — Reference bypass capacitor |
| Chân 6 | REF — Reference input/output (2.5V) |
| Chân 7 | DVDD — Digital supply |
| Chân 8 | DGND — Digital ground |
| Chân 9 | DB0 — Parallel data bit 0 / LSB |
| Chân 10 | DB1 — Parallel data bit 1 |
| Chân 11 | DB2 — Parallel data bit 2 |
| Chân 12 | DB3 — Parallel data bit 3 |
| Chân 13 | DB4 — Parallel data bit 4 |
| Chân 14 | DB5 — Parallel data bit 5 |
| Chân 15 | DB6 — Parallel data bit 6 |
| Chân 16 | DB7 — Parallel data bit 7 |
| Chân 17 | DB8 — Parallel data bit 8 |
| Chân 18 | DB9 — Parallel data bit 9 |
| Chân 19 | DB10 — Parallel data bit 10 |
| Chân 20 | DB11 — Parallel data bit 11 |
| Chân 21 | DB12 — Parallel data bit 12 |
| Chân 22 | DB13 — Parallel data bit 13 |
| Chân 23 | DB14 — Parallel data bit 14 |
| Chân 24 | DB15 — Parallel data bit 15 / MSB |
| Chân 25 | SDOUT — Serial data output |
| Chân 26 | SCLK — Serial clock input |
| Chân 27 | CS — Chip select (active low) |
| Chân 28 | RD — Read input (active low) |
| Chân 29 | WR/RC — Write / conversion start |
| Chân 30 | BUSY — Conversion in progress (active high) |
| Chân 31 | OB/2C — Output straight binary / twos complement select |
| Chân 32 | IMPULSE — Impulse mode select |
| Chân 33 | SER/PAR — Serial / parallel interface select |
| Chân 34 | EXT/INT — External / internal reference select |
| Chân 35 | NC — Not connected (per datasheet) |
| Chân 36 | NC — Not connected (per datasheet) |
| Chân 37 | NC — Not connected (per datasheet) |
| Chân 38 | NC — Not connected (per datasheet) |
| Chân 39 | NC — Not connected (per datasheet) |
| Chân 40 | NC — Not connected (per datasheet) |
| Chân 41 | NC — Not connected (per datasheet) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
| Chân 45 | NC — Not connected (per datasheet) |
| Chân 46 | NC — Not connected (per datasheet) |
| Chân 47 | NC — Not connected (per datasheet) |
| Chân 48 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
AD7666ACPZRL phù hợp cho 6 Áp dụngs: Industrial Process Control, Precision Data Acquisition Systems, Medical Instrumentation Front-End, Spectrum Analyzer IF Digitizer, Power Quality Monitoring, Test & Measurement Equipment.
Industrial Process Control
The AD7666ACPZRL's 16-bit resolution and 500 kSPS throughput make it well suited for industrial process control loops where deterministic low-latency sampling is required. SAR architecture provides zero pipeline delay - critical for closed-loop PID control where sample latency directly impacts loop stability. The integrated 2.5 V reference (3 ppm/C typical drift) eliminates the need for an external reference IC, reducing BOM and improving long-term measurement stability in factory environments. Combined with the -40C to +125C industrial temperature rating, the AD7666ACPZRL is suitable for PLC analog input modules, distributed control systems (DCS), and SCADA remote terminal units (RTUs) operating in harsh plant environments.
Được đề xuất
Precision Data Acquisition Systems
For multi-channel precision DAQ systems, the AD7666ACPZRL's +/-2.0 LSB max INL (+/-0.0038% FS) and integrated reference simplify per-channel calibration. The part's 500 kSPS rating supports oversampling in multiplexed channel scans, enabling effective resolution improvements when combined with digital averaging. The 48-LFCSP-VQ (7x7) footprint is well suited to compact DAQ board layouts where multiple ADCs are placed near their analog input conditioning. Place the device close to the input MUX outputs and follow Analog Devices' reference layout to achieve datasheet-grade linearity in 16-bit data acquisition boards.
Được đề xuất
Medical Instrumentation Front-End
Medical instrumentation such as patient monitors, infusion pumps, and diagnostic equipment benefits from the AD7666ACPZRL's combination of 16-bit resolution, low noise, and integrated reference. The 500 kSPS throughput supports diagnostic ultrasound front-end digitizers and ECG signal capture with adequate margin. The SAR architecture's deterministic latency is well suited to medical device firmware timing analysis required by IEC 62304. The 48-LFCSP-VQ package supports the compact PCB layouts typical of portable medical devices.
Được đề xuất
Spectrum Analyzer IF Digitizer
Spectrum analyzer and communications test equipment use the AD7666ACPZRL to digitize intermediate frequency (IF) signals at 500 kSPS with 16-bit resolution. The SAR architecture's excellent linearity and low distortion support spurious-free dynamic range (SFDR) performance critical to identifying weak spectral lines in the presence of large signals. The integrated 2.5 V reference scales the input range to match IF strip output levels, eliminating an external reference IC. Per Analog Devices' typical application circuits, the AD7666ACPZRL is paired with a low-distortion differential driver such as the AD8138 for IF sampling applications.
Được đề xuất
Power Quality Monitoring
Power quality analyzers, smart meters, and protective relays benefit from the AD7666ACPZRL's 16-bit resolution and 500 kSPS throughput. The part's SAR architecture and integrated reference support simultaneous voltage and current sensing at high dynamic range, critical for measuring THD and harmonic content per IEC 61000-4-7. The industrial temperature rating supports outdoor and substation cabinet installations. Place the ADC close to current shunt and voltage divider signal conditioning for best noise performance.
Được đề xuất
Test & Measurement Equipment
Test and measurement instruments such as benchtop multimeters, oscilloscope auxiliary channels, and data loggers can leverage the AD7666ACPZRL's 16-bit 500 kSPS performance. The integrated 2.5 V reference simplifies DMM calibration paths and the part's SAR architecture provides repeatable measurements critical to benchtop precision. The exposed-pad LFCSP-48 package supports continuous-conversion thermal performance in lab instruments with sustained data logging. Combine with Analog Devices' precision op-amps (e.g., AD8628) for input buffering to maintain 16-bit accuracy at the system level.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7666ACPZRL — 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 | AD7666ACPZ | AD7666ASTZ | AD7667ACPZRL | AD7621ACPZ | ADS8482IBRGZR |
|---|---|---|---|---|---|---|
| Package | 48-LFCSP-VQ (7x7) | 48-LFCSP-VQ (7x7) - same | 48-LQFP | 48-LFCSP-VQ (7x7) - same | 48-LFCSP (7x7) - same | 48-LFCSP-VQ (7x7) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 18 bits |
| Sampling Rate | 500 kSPS | 500 kSPS | 500 kSPS | 1 MSPS | 3 MSPS | 1 MSPS |
| Internal Reference | Yes (2.5V) | Yes (2.5V) | Yes (2.5V) | Yes (2.5V) | Yes (2.5V) | No (external required) |
| Data Interface | Parallel/Serial | Parallel/Serial | Parallel/Serial | Parallel/Serial | Parallel/Serial | Parallel/Serial |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +85C | -40C to +85C |
| Unit Price (qty 1, USD) | 19.50 | 18.50 | 20.10 | 21.20 | 27.40 | 16.80 |
Bảo phân biệt quan trọng
- Integrated 2.5V reference with 3 ppm/C typical drift (vsADS8482IBRGZR)
- Industrial temperature range -40C to +125C (vsAD7621ACPZ)
- Lower sampling rate reduces power consumption (vsAD7667ACPZRL)
Ghi chú thiết kế
The AD7666ACPZRL requires clean analog and digital supplies. Per Analog Devices' reference layout, decouple AVDD (pin 1) with a 10 uF tantalum in parallel with a 100 nF ceramic placed within 5 mm of the pin. Use a ferrite bead between AVDD and DVDD to prevent digital switching noise from coupling into the analog front-end. Estimated: assuming 500 kSPS continuous operation at 5 V analog supply, the analog supply current is approximately 12 mA per the datasheet typical.
Place the AD7666ACPZRL's exposed pad on a continuous ground plane with multiple thermal vias to dissipate internal reference and ADC core heat. Route the REFCAP decoupling (pin 5) directly to the closest AGND (pin 2) with a short, low-inductance trace. Avoid running digital traces under the exposed pad. Estimated: at 500 kSPS continuous conversion, internal power dissipation is approximately 60 mW, well within the package's thermal capability when properly soldered.
Common pitfalls: (1) Do not drive the analog input beyond AVDD or below AGND - the input is unipolar only. (2) Tie SER/PAR (pin 33) and EXT/INT (pin 34) to known logic levels - floating pins can cause unpredictable mode selection. (3) When using the internal reference, place the REFCAP ceramic (typically 10 uF) directly at the pin. (4) The BUSY pin (pin 30) is active high during conversion - ensure host MCU/DSP timing accounts for full conversion time including acquisition.
Thông tin tuân thủ
RoHS and lead-free compliant per Analog Devices product page. Not AEC-Q100 qualified - select automotive-grade ADCs from the ADI portfolio for vehicle applications.
