AD7666ACPZRL - 16-Bit 500kSPS SAR ADC w/ Ref | Analog Devices
料号： AD7666ACPZRL ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $19.5 | $19.50 |
| 10 | $17.55 | $175.50 |
| 100 | $15.6 | $1,560.00 |
| 500 | $13.95 | $6,975.00 |
| 1,000 | $12.45 | $12,450.00 |
AD7666ACPZRL 概述
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.
直接替换替代料： AD7666ACPZRL ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： AD7666ACPZRL （相同外形与封装尺寸） ——差异在于 Operating Temperature, Package, Architecture, Data Interface, Input Type.
快速对比工具——选择替代料号进行并排对比：
AD7666ACPZ
✅ 直接替换📋 参考替代料（不在目录中）
AD7666ASTZ
✅ 直接替换📋 参考替代料（不在目录中）
AD7667ACPZRL
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AD7650ACPZRL
✅ 直接替换✓ 有现货
$17.92 / 个
查看数据手册 →AD7641BCPZRL
✅ 直接替换✓ 有现货
$19.8 / 个
查看数据手册 →AD7621ACPZ
✅ 直接替换📋 参考替代料（不在目录中）
ADS8482IBRGZR
✅ 直接替换✓ 有现货
$14.45 / 个
查看数据手册 →AD7666ACPZRL 最大额定值与电气特性
| 分辨率 | 16 bits |
| Architecture | SAR (Successive Approximation) |
| Number of Inputs | 1 |
| 采样率 | 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 |
| 工作温度 | -40C to +125C |
| 封装 | 48-LFCSP-VQ (7x7 mm) with EP |
| 安装类型 | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Input Range | 0 V to VREF |
| RoHS 状态 | Compliant |
AD7666ACPZRL 引脚配置
| 引脚 1 | AVDD — Analog supply (5V) |
| 引脚 2 | AGND — Analog ground |
| 引脚 3 | IN+ — Analog input positive |
| 引脚 4 | IN- — Analog input negative / ground-sense |
| 引脚 5 | REFCAP — Reference bypass capacitor |
| 引脚 6 | REF — Reference input/output (2.5V) |
| 引脚 7 | DVDD — Digital supply |
| 引脚 8 | DGND — Digital ground |
| 引脚 9 | DB0 — Parallel data bit 0 / LSB |
| 引脚 10 | DB1 — Parallel data bit 1 |
| 引脚 11 | DB2 — Parallel data bit 2 |
| 引脚 12 | DB3 — Parallel data bit 3 |
| 引脚 13 | DB4 — Parallel data bit 4 |
| 引脚 14 | DB5 — Parallel data bit 5 |
| 引脚 15 | DB6 — Parallel data bit 6 |
| 引脚 16 | DB7 — Parallel data bit 7 |
| 引脚 17 | DB8 — Parallel data bit 8 |
| 引脚 18 | DB9 — Parallel data bit 9 |
| 引脚 19 | DB10 — Parallel data bit 10 |
| 引脚 20 | DB11 — Parallel data bit 11 |
| 引脚 21 | DB12 — Parallel data bit 12 |
| 引脚 22 | DB13 — Parallel data bit 13 |
| 引脚 23 | DB14 — Parallel data bit 14 |
| 引脚 24 | DB15 — Parallel data bit 15 / MSB |
| 引脚 25 | SDOUT — Serial data output |
| 引脚 26 | SCLK — Serial clock input |
| 引脚 27 | CS — Chip select (active low) |
| 引脚 28 | RD — Read input (active low) |
| 引脚 29 | WR/RC — Write / conversion start |
| 引脚 30 | BUSY — Conversion in progress (active high) |
| 引脚 31 | OB/2C — Output straight binary / twos complement select |
| 引脚 32 | IMPULSE — Impulse mode select |
| 引脚 33 | SER/PAR — Serial / parallel interface select |
| 引脚 34 | EXT/INT — External / internal reference select |
| 引脚 35 | NC — Not connected (per datasheet) |
| 引脚 36 | NC — Not connected (per datasheet) |
| 引脚 37 | NC — Not connected (per datasheet) |
| 引脚 38 | NC — Not connected (per datasheet) |
| 引脚 39 | NC — Not connected (per datasheet) |
| 引脚 40 | NC — Not connected (per datasheet) |
| 引脚 41 | NC — Not connected (per datasheet) |
| 引脚 42 | NC — Not connected (per datasheet) |
| 引脚 43 | NC — Not connected (per datasheet) |
| 引脚 44 | NC — Not connected (per datasheet) |
| 引脚 45 | NC — Not connected (per datasheet) |
| 引脚 46 | NC — Not connected (per datasheet) |
| 引脚 47 | NC — Not connected (per datasheet) |
| 引脚 48 | NC — Not connected (per datasheet) |
典型应用
AD7666ACPZRL 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： AD7666ACPZRL ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Integrated 2.5V reference with 3 ppm/C typical drift （对比 ADS8482IBRGZR)
- Industrial temperature range -40C to +125C （对比 AD7621ACPZ)
- Lower sampling rate reduces power consumption （对比 AD7667ACPZRL)
设计说明
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.
合规信息
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.
