AD1674AR-REEL - 12-Bit 100kSPS Complete ADC | Analog Devices
料号： AD1674AR-REEL ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $25.65 | $256.50 |
| 100 | $22.8 | $2,280.00 |
| 500 | $19.95 | $9,975.00 |
| 1,000 | $17.5 | $17,500.00 |
AD1674AR-REEL 概述
A successive-approximation ADC is a converter architecture that resolves one bit per internal clock cycle by comparing the sampled input against a precision DAC. Modern SAR ADCs integrate a sample-and-hold amplifier on the input so the user does not have to drive the converter with a continuous low-impedance signal - this widens the input bandwidth and simplifies the front-end filter design. The AD1674 fits into the converter hierarchy as: ADC -> SAR ADC -> monolithic complete ADC -> data-acquisition IC, and bridges industrial analog signal chains and 8-/16-bit microprocessor buses.
Key differentiating features of the AD1674 include its complete monolithic integration (SHA + reference + clock + buffers in one die), industry-standard pinout pin-compatible with the legacy AD574A and AD674A, 10 us conversion time, three-state bus outputs with logic/control pins (CS, R/C, CE, A0, 12/8, STS) for direct 8-bit or 16-bit microprocessor hookup, and bipolar/unipolar input ranges via pin strapping. The internal buried-Zener reference trims to 10.00 V +/-0.5%, eliminating external reference components.
Internally, the converter uses a precision thin-film DAC array, a high-speed comparator and a successive-approximation register clocked by an internal RC oscillator. The SHA front-end can acquire full-scale inputs in under 1 us, supporting the 100 kSPS throughput; the wideband sample-and-hold supports 12-bit accuracy across the full Nyquist bandwidth, so AC inputs up to 50 kHz can be digitized with negligible aperture distortion. Output coding is user-selectable for unipolar (0-10 V, 0-20 V) or bipolar (-5 V to +5 V, -10 V to +10 V) input ranges.
Typical applications for the AD1674AR-REEL include industrial process-control data acquisition front ends, instrumentation and measurement systems, multichannel analog input boards with multiplexer scanning, scan-digitizer cards and legacy AD574A/AD674A designs that need a faster, SHA-equipped upgrade. The R-grade (industrial) temperature range and 28-SOIC footprint make it a drop-in replacement for older designs requiring faster sample rates without a layout change.
When designing, note that the converter draws significant supply current - place 10 uF tantalum and 0.1 uF ceramic bypass capacitors close to the AVcc and DVcc pins and use a star-ground topology. Avoid switching the analog input while STS (status) is low; violating this timing window injects conversion errors.
This page synthesizes distributor pricing, drop-in alternatives and practical design notes for the AD1674AR-REEL that are not aggregated on the manufacturer product page or on typical distributor catalog pages.
直接替换替代料： AD1674AR-REEL ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
AD1674ARZ-REEL
✅ 直接替换📋 参考替代料（不在目录中）
AD1674ARZ
✅ 直接替换📋 参考替代料（不在目录中）
AD1674JRZ
✅ 直接替换📋 参考替代料（不在目录中）
AD1674JRZ-REEL
✅ 直接替换📋 参考替代料（不在目录中）
AD1674KRZ
✅ 直接替换📋 参考替代料（不在目录中）
AD1674AR-REEL 最大额定值与电气特性
| Number of Bits | 12 |
| Architecture | SAR (Successive Approximation) |
| Number of Inputs | 1 |
| Sampling Rate (Per Second) | 100 kSPS |
| Conversion Time | 10 us |
| Data Interface | Parallel |
| Input Type | Single-Ended (unipolar or bipolar, pin-strapped) |
| On-Chip Reference | 10 V internal reference |
| On-Chip Sample-and-Hold | Yes (SHA, user-transparent) |
| On-Chip Clock | Yes (internal) |
| Output Buffers | 3-state, microprocessor-compatible |
| 封装 / 外壳 | 28-SOIC (0.295", 7.50 mm width) |
| 工作温度 | -40C to +85C (industrial grade) |
| 安装类型 | Surface Mount |
| Packaging | Cut Tape / Reel (REEL) |
| Pin Compatibility | Industry-standard AD574A / AD674A pinout |
| RoHS 状态 | Compliant |
AD1674AR-REEL 引脚配置
| 引脚 1 | VREF — +10 V reference output (decouple to AGND with 10 uF) |
| 引脚 2 | BIPOFF — Bipolar offset adjust / unipolar mode strap |
| 引脚 3 | SENSE — Analog input range strap (10 V / 20 V) |
| 引脚 4 | AIN — Analog input |
| 引脚 5 | AGND — Analog ground |
| 引脚 6 | AVcc — +15 V analog supply (decouple close to pin) |
| 引脚 7 | AVss — -15 V analog supply |
| 引脚 8 | R/C — Read/Convert control input |
| 引脚 9 | A0 — Address / mode select (8-bit high/low byte) |
| 引脚 10 | CS — Chip select (active low) |
| 引脚 11 | CE — Chip enable (active high) |
| 引脚 12 | 12/8 — Output mode strap (12-bit bus or 8-bit byte) |
| 引脚 13 | STS — Status output (low during conversion) |
| 引脚 14 | DGND — Digital ground |
| 引脚 15 | DB0 — Data bit 0 (LSB) |
| 引脚 16 | DB1 — Data bit 1 |
| 引脚 17 | DB2 — Data bit 2 |
| 引脚 18 | DB3 — Data bit 3 |
| 引脚 19 | DB4 — Data bit 4 |
| 引脚 20 | DB5 — Data bit 5 |
| 引脚 21 | DB6 — Data bit 6 |
| 引脚 22 | DB7 — Data bit 7 |
| 引脚 23 | DB8 — Data bit 8 |
| 引脚 24 | DB9 — Data bit 9 |
| 引脚 25 | DB10 — Data bit 10 |
| 引脚 26 | DB11 — Data bit 11 (MSB) |
| 引脚 27 | DVcc — +5 V digital supply |
| 引脚 28 | REF IN — Reference input (typically tied to VREF) |
典型应用
AD1674AR-REEL 适用于 6 应用s: Industrial Process-Control Data Acquisition, Instrumentation and Measurement Systems, Multichannel Analog Input Boards, Legacy AD574A/AD674A Drop-In Upgrade, Scan-Digitizer and Waveform Capture Cards, Industrial PLC Analog Input Modules.
Industrial Process-Control Data Acquisition
The AD1674AR-REEL fits industrial process-control front ends because its 12-bit resolution, 100 kSPS sampling rate and integrated sample-and-hold amplifier let engineers digitize 4-20 mA and 0-10 V process signals with a single IC. The 28-SOIC footprint and AD574A/AD674A pinout allow direct placement on legacy I/O boards without re-laying the PCB; the on-chip 10 V reference removes the need for an external precision reference. Compared with a discrete ADC+SHA+reference design, the AD1674 reduces BOM count and improves temperature stability over the -40C to +85C industrial range.
推荐
Instrumentation and Measurement Systems
The AD1674AR-REEL is well-suited to bench-top instrumentation and bench DMM front ends because its wideband SHA supports 12-bit accuracy over the full Nyquist bandwidth, so AC inputs up to 50 kHz can be captured without an external track-and-hold. The microprocessor-compatible parallel bus and 12/8 pin (pin-strap configurable to either 8-bit or 16-bit output) let the ADC connect directly to legacy 8051 or 8086-class MCUs without glue logic. Industrial-grade -40C to +85C operation is sufficient for laboratory and field-portable measurement tools that need calibration-grade linearity.
推荐
Multichannel Analog Input Boards
In a multichannel analog input board, the AD1674AR-REEL serves as the final-stage digitizer after an external analog multiplexer such as the ADG1401 or ADG706. Its 10 us conversion time and 100 kSPS throughput allow aggregate scan rates of 10 kHz per channel on a 10-channel board, sufficient for industrial thermocouple and pressure-scanner applications. The three-state output bus permits direct connection to a shared data bus without additional isolation logic, and the on-board SHA eliminates cross-channel settling delays that plague successive-approximation designs with external muxes.
推荐
Legacy AD574A/AD674A Drop-In Upgrade
The AD1674AR-REEL is the recommended upgrade path for legacy AD574A or AD674A designs that need a faster conversion rate without a PCB redesign. Because the 28-SOIC pinout is identical, the part is a true drop-in; the gain in conversion time is 25 us to 10 us, a 2.5x speedup, and the SHA front end removes the need for an external AD582 SHA in legacy schematics. Industrial-grade temperature range matches the AD574A's typical deployment environment, and the on-chip reference trims to within +/-0.5% so the 10 V reference buffer normally required by the AD574A can be simplified.
推荐
Scan-Digitizer and Waveform Capture Cards
The AD1674AR-REEL can serve as the ADC for scan-digitizer cards in PC-based data-acquisition plug-in boards where its 100 kSPS throughput and 12-bit resolution provide a good cost/performance trade-off. The wideband SHA (12-bit accurate to the Nyquist limit) supports periodic waveform capture of audio-band signals and vibration sensor outputs without external sampling capacitors. The 8-bit or 16-bit parallel output bus connects directly to ISA/PCI bridge ASICs, and the internal clock removes the need for an external crystal or oscillator.
推荐
Industrial PLC Analog Input Modules
The AD1674AR-REEL is suitable for PLC analog input modules where its on-board SHA, reference and clock combine to a compact, electrically clean digitizer. With 12-bit resolution and a 100 kSPS conversion rate, the ADC satisfies IEC 61131-2 analog-input type-3 specifications for industrial process control. The industrial-grade -40C to +85C operating temperature range and surface-mount 28-SOIC package support reflow-soldered backplane assemblies and field-mounted DIN-rail modules. Drop-in compatibility with the AD574A footprint preserves PLC legacy I/O card layouts.
推荐
推荐产品汇总
工程参考数据： AD1674AR-REEL ——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 | AD1674ARZ-REEL | AD1674ARZ | AD1674JRZ | AD1674JRZ-REEL | AD1674KRZ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-SOIC (R-28, 7.50 mm) | 28-SOIC (R-28, 7.50 mm) - same | 28-SOIC (R-28, 7.50 mm) - same | 28-SOIC (R-28, 7.50 mm) - same | 28-SOIC (R-28, 7.50 mm) - same | 28-SOIC (R-28, 7.50 mm) - same |
| Resolution | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit |
| Sampling Rate | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS |
| Temperature Grade | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Commercial (0C to +70C) | Commercial (0C to +70C) | Automotive/Extended (-55C to +125C) |
| Shipping Carrier | Tape & Reel (REEL) | Tape & Reel (REEL) | Tube | Tube | Tape & Reel (REEL) | Tube |
| RoHS Compliance | Pb-bearing (REEL suffix) | RoHS-compliant (Z suffix) | RoHS-compliant (Z suffix) | RoHS-compliant (Z suffix) | RoHS-compliant (Z suffix) | RoHS-compliant (Z suffix) |
| On-Chip SHA / Reference / Clock | Yes (all integrated) | Yes (all integrated) | Yes (all integrated) | Yes (all integrated) | Yes (all integrated) | Yes (all integrated) |
关键差异点
- RoHS-compliant drop-in variant for new designs （对比 AD1674ARZ-REEL)
- Wider temperature range for harsh environments （对比 AD1674JRZ / AD1674JRZ-REEL)
- Extended temperature option with same pinout （对比 AD1674KRZ)
设计说明
Decouple the AVcc (+15 V), AVss (-15 V) and DVcc (+5 V) pins with a 10 uF tantalum capacitor in parallel with a 0.1 uF ceramic capacitor placed as close as physically possible to each pin. Use a star-ground topology that ties AGND and DGND at the converter's ground pins only; do not run return currents through the converter's ground. The internal 10 V reference draws current only during conversion, but the SHA front-end requires low-noise analog supplies, so a dedicated linear regulator for AVcc is recommended in electrically noisy environments.
Do not toggle the analog input or change the input-range strapping (BIPOFF/SENSE) while STS is low (i.e., while a conversion is in progress). Violating this timing window injects conversion errors and produces intermittent 1-2 LSB noise. The internal SHA acquires the input at the falling edge of STS to the high state, so any input change between that edge and the next conversion start will corrupt the result. Lock the input range strap pins to AGND or AVcc with low-impedance paths and never drive AIN with a slow-settling op-amp output that has not settled within the 1 us acquisition window.
Lay out the analog input trace as a short, guarded path surrounded by ground copper on both sides. Place the bypass capacitors on the AVcc and DVcc pins before any other components on the net so the high-current return loops are minimized. Keep the digital output bus traces (DB0-DB11, STS, R/C, CS, CE) routed away from the analog input pin and the VREF bypass node, and add a series damping resistor (100 ohm) on the STS line if the digital trace length exceeds 50 mm. Avoid routing the 10 VREF trace under the analog input; the leakage to AGND can degrade linearity.
Use a single ground plane divided into AGND and DGND sections connected only at the converter's ground pins. The 28-SOIC package has only two ground pins (pin 5 AGND and pin 14 DGND); tie them together at the IC with a short trace and split the ground plane on either side of that tie point. Avoid running digital return currents through the analog section of the ground plane, especially on boards with fast microprocessors or switching converters. Place the VREF bypass capacitor (10 uF + 0.1 uF) directly between pin 1 VREF and pin 5 AGND.
合规信息
The REEL suffix indicates a Pb-bearing tape-and-reel carrier. RoHS-compliant equivalents are the Z-suffix variants (AD1674ARZ, AD1674ARZ-REEL, AD1674JRZ, AD1674JRZ-REEL, AD1674KRZ) per Analog Devices cross-reference notes. AEC-Q100 is not applicable to the AR/REEL ordering code; choose the K-grade for automotive-grade qualification.
