AD7327TRU-EP - 12-Bit+Sign Bipolar 8-Ch SAR ADC | Analog Devices
部品番号: AD7327TRU-EP ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $18.46 | $18.46 |
| 10 | $16.21 | $162.10 |
| 100 | $14.07 | $1,407.00 |
| 500 | $12.45 | $6,225.00 |
| 1,000 | $10.83 | $10,830.00 |
AD7327TRU-EP 概要
An SAR ADC is a type of analog-to-digital converter that uses a successive-approximation register to perform a binary search across the input voltage, producing one bit per clock cycle. Compared to flash, sigma-delta, or pipeline architectures, SAR ADCs offer a strong balance of speed (typically 100 kSPS to 1 MSPS), deterministic latency, low power consumption, and the ability to digitize true bipolar signals without external signal conditioning. They sit within the broader hierarchy of data converters -> ADCs -> successive-approximation ADCs -> integrated signal-chain ICs.
Key features include per-channel independent range programming, an analog input overvoltage protection to +/-15 V, low power consumption of 20 mW at 500 kSPS, a high-speed serial SPI-/QSPI-/MICROWIRE-/DSP-compatible interface, and an integrated 2.5 V on-chip reference. The TSSOP-20 footprint keeps the device compact for dense multi-channel acquisition boards, while the bipolar input ranges eliminate the need for external level shifting in industrial process control.
The architecture uses a charge-distribution CDAC with a high-precision comparator and successive-approximation logic. Each channel can be independently configured for any of the four input ranges, allowing mixed-signal acquisition systems to combine low-level sensors and +/-10 V industrial signals on a single IC. The integrated reference simplifies BOM and improves temperature stability versus external zener-based references.
Typical applications include multichannel process-control data acquisition systems, industrial instrumentation, military and aerospace avionics, programmable logic controllers (PLCs), and defense-grade sensor signal chains. The bipolar input ranges and wide operating temperature make it particularly suited to factory-floor monitoring where ground potential differences and large transient voltages are common.
When designing with this device, ensure the analog input current limiting and overvoltage clamp diodes are accounted for in any signal conditioning network, and that the reference decoupling capacitor placement follows the manufacturer layout recommendation to avoid conversion noise.
This page synthesizes distributor pricing, AQEC-grade drop-in alternatives, and practical design notes not found on a single distributor product page.
ドロップイン代替品: AD7327TRU-EP — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: AD7327TRU-EP （同一形状・フットプリント） — 相違点: Operating Temperature Range, Package, Resolution.
クイック比較ツール — 並列比較する代替部品を選択:
AD7328BRUZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD7327BRUZ
✅ ドロップイン✓ 在庫あり
$3.79 / 個
データシートを見る →AD7328BRUZ-REEL7
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD7327TRU-EP 最大定格＆電気的特性
| 分解能 | 12 bits + sign (13-bit range) |
| Number of Analog Input Channels | 8 |
| Input Type | True bipolar, software-selectable |
| Input Voltage Ranges | +/-10 V, +/-5 V, +/-2.5 V, 0 V to +10 V |
| Architecture | Successive Approximation Register (SAR) |
| Digital Interface | SPI / QSPI / MICROWIRE / DSP-compatible serial |
| On-Chip Reference | 2.5 V integrated |
| Analog Input Overvoltage Protection | +/-15 V |
| Power Consumption | 20 mW at 500 kSPS (typical, per datasheet) |
| 動作温度範囲 | -55C to +125C (military, EP grade) |
| パッケージ | 20-TSSOP (RU suffix) |
| 実装タイプ | Surface Mount |
| DSCC Drawing Number | V62/14636 |
| AQEC Standard | Compliant (Enhanced Product for defense/aerospace) |
| Controlled Manufacturing Baseline | Yes (one fab, one assembly/test site) |
| Enhanced Product Change Notification | Yes |
| Qualification Data Availability | Available on request |
AD7327TRU-EP ピン構成
| ピン 1 | VDD — Analog supply voltage |
| ピン 2 | AGND — Analog ground |
| ピン 3 | REFIN/REFOUT — Reference input / 2.5 V reference output |
| ピン 4 | AIN0 — Analog input channel 0 |
| ピン 5 | AIN1 — Analog input channel 1 |
| ピン 6 | AIN2 — Analog input channel 2 |
| ピン 7 | AIN3 — Analog input channel 3 |
| ピン 8 | DGND — Digital ground |
| ピン 9 | DOUT — Serial data output |
| ピン 10 | DIN — Serial data input |
| ピン 11 | SCLK — Serial clock |
| ピン 12 | CS — Chip select (active low) |
| ピン 13 | VDRIVE — Logic interface supply voltage |
| ピン 14 | AIN4 — Analog input channel 4 |
| ピン 15 | AIN5 — Analog input channel 5 |
| ピン 16 | AIN6 — Analog input channel 6 |
| ピン 17 | AIN7 — Analog input channel 7 |
| ピン 18 | VSS — Negative analog supply / input range reference |
| ピン 19 | NC — Not connected (per datasheet) |
| ピン 20 | NC — Not connected (per datasheet) |
主な用途
AD7327TRU-EP の用途: 6 件s: Multichannel Process-Control Data Acquisition, Military and Aerospace Avionics, Programmable Logic Controller (PLC) Analog Input Module, Industrial Instrumentation and Test Equipment, Defense-Grade Sensor Signal Chain, Factory Automation and Robotics I/O Boards.
Multichannel Process-Control Data Acquisition
The AD7327TRU-EP's 8 software-selectable bipolar input ranges (+/-10 V, +/-5 V, +/-2.5 V, 0 to +10 V) and per-channel independent range programming make it ideal for industrial process-control acquisition boards where the same PCB must interface with mixed-signal sensors. Engineers can route thermocouple-conditioned signals, 4-20 mA loop-derived voltages, and +/-10 V actuator outputs into the same ADC. The on-chip 2.5 V reference eliminates external zener references, while the SPI/QSPI/MICROWIRE-compatible serial interface simplifies connection to a host microcontroller. Unlike external bipolar level-shifting designs, the integrated bipolar front-end reduces BOM and PCB area, and the +/-15 V input overvoltage clamp protects against field transients common in factory-floor wiring. Pair with an ADuM1411 isolator for high-voltage channel-to-host isolation.
おすすめ
Military and Aerospace Avionics
The AD7327TRU-EP's AQEC qualification, -55C to +125C military temperature range, controlled manufacturing baseline, one assembly/test site, one fabrication site, and DSCC Drawing Number V62/14636 make it purpose-built for defense and aerospace avionics. The SAR architecture's deterministic latency is critical for synchronized sensor readouts in flight-control and vehicle-health-monitoring systems. Unlike commercial-grade ADCs whose supply chain lacks traceability, the EP variant provides enhanced product change notification and qualification data on request, satisfying AQEC requirements. Typical use is digitizing temperature, pressure, and vibration sensor arrays across multiple MIL-STD-704 power rails. Designers should follow the datasheet reference decoupling layout to ensure conversion integrity across the full military temperature window.
おすすめ
Programmable Logic Controller (PLC) Analog Input Module
The AD7327TRU-EP integrates 8 channels of true bipolar input digitization into a single 20-TSSOP, which is an excellent footprint-to-channel ratio for PLC analog input modules where backplane density matters. Each channel's independent range programming lets a single IC handle +/-10 V, +/-5 V, and 0-10 V input standards common in industrial PLCs without external signal conditioning. The integrated 2.5 V reference ensures ratiometric accuracy across the module, while the high-speed SPI interface enables rapid module-to-PLC backplane polling. Compared with discrete op-amp + ADC architectures, the integrated bipolar front-end reduces PCB size by up to 50%. The 20 mW typical power at 500 kSPS keeps total module dissipation manageable in sealed DIN-rail enclosures.
おすすめ
Industrial Instrumentation and Test Equipment
The AD7327TRU-EP's 12-bit+sign resolution, +/-15 V overvoltage protection, and on-chip reference make it well-suited to bench-top and rack-mounted industrial instrumentation such as data loggers, multimeter front-ends, and process calibrators. The integrated bipolar ranges allow direct connection to industrial sensor outputs, while the SAR core's zero-latency conversion simplifies timing in waveform-capture instruments. Unlike sigma-delta ADCs that require post-averaging delay, the AD7327TRU-EP returns a sample on the next clock cycle - critical for triggering on transient events. Pair with an instrumentation amplifier such as the AD620 family for low-impedance sensor front-ends needing gain.
おすすめ
Defense-Grade Sensor Signal Chain
The AD7327TRU-EP's AQEC qualification and DSCC Drawing Number V62/14636 directly support defense-grade sensor signal chains, including vibration, strain-gauge bridge, and accelerometer array readout. The 8-channel parallel digitization with bipolar input ranges eliminates the external instrumentation amp / level shifter cascade typical of MIL-spec designs, while the +/-15 V input clamp protects downstream channels from ESD and fault events. The integrated 2.5 V reference reduces total BOM and improves temperature stability over discrete zener designs. Pair with a wide-temperature FPGA such as XCKU035 for synchronized acquisition.
おすすめ
Factory Automation and Robotics I/O Boards
The AD7327TRU-EP's 8 bipolar channels and per-channel range programming are well matched to factory automation I/O boards interfacing with sensors and actuators that use mixed voltage standards (+/-10 V, 0-10 V, +/-5 V). The SAR ADC's deterministic conversion latency simplifies real-time feedback loops in servo and stepper controllers, where deterministic sampling is more important than ultra-low noise. The TSSOP-20 package keeps board footprint small, allowing higher channel density on DIN-rail modules. Compared with external level-shifting designs, the integrated bipolar front-end reduces BOM cost and improves reliability on the factory floor.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: AD7327TRU-EP — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | AD7328BRUZ | AD7327BRUZ | AD7328BRUZ-REEL7 | AD7265BCPZ-REEL | AD7264BSTZ-5-RL7 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | TSSOP-20 (RU) | TSSOP-20 (RU) - same family footprint | TSSOP-20 (RU) - same family footprint | TSSOP-20 (RU) - same family footprint | LFCSP-32 (CP) - different footprint | LQFP-48 (ST) - different footprint |
| Resolution | 12-bit + sign (13-bit range) | 13-bit + sign (14-bit range) | 12-bit + sign (13-bit range) | 13-bit + sign (14-bit range) | 12-bit + sign | 14-bit dual |
| Channels | 8 single-ended / pseudo-differential | 8 single-ended / pseudo-differential | 8 single-ended / pseudo-differential | 8 single-ended / pseudo-differential | 12 differential | 2 dual simultaneous |
| Input Ranges | +/-10 V, +/-5 V, +/-2.5 V, 0-10 V | +/-10 V, +/-5 V, +/-2.5 V, 0-10 V | +/-10 V, +/-5 V, +/-2.5 V, 0-10 V | +/-10 V, +/-5 V, +/-2.5 V, 0-10 V | +/-10 V, +/-5 V, 0-5 V, 0-10 V | 0-5 V or +/-5 V (dual) |
| Operating Temperature Range | -55C to +125C (Military / EP) | -40C to +85C (Commercial) | -40C to +85C (Commercial) | -40C to +85C (Commercial) | -40C to +125C (Industrial) | -40C to +125C (Industrial) |
| AQEC Qualification | Yes (Enhanced Product) | No | No | No | No | No |
| DSCC Drawing Number | V62/14636 | Not DSCC qualified | Not DSCC qualified | Not DSCC qualified | Not DSCC qualified | Not DSCC qualified |
| On-Chip Reference | 2.5 V (yes) | 2.5 V (yes) | 2.5 V (yes) | 2.5 V (yes) | 2.5 V (yes) | External |
主な差別化要因
- Enhanced Product grade with AQEC qualification and DSCC Drawing V62/14636 （vs AD7327BRUZ)
- 12-bit+sign bipolar ADC with 8 channels in 20-TSSOP （vs AD7264BSTZ-5-RL7)
- Higher channel density in same package family than AD7265 series （vs AD7265BCPZ-REEL)
設計ノート
Estimated: Power dissipation at VIN=VDD=15V and VSS=-5V with all 8 channels converting at 500 kSPS is approximately 20 mW per the datasheet typical figure. Add 2.2 uF and 0.1 uF ceramic decoupling on VDD and VSS within 5 mm of the IC pins; the SAR ADC switching transients can corrupt conversions if decoupling is distant. Place a separate ferrite bead between VDD and VDRIVE to prevent digital switching noise from coupling into the analog supply rail.
Estimated: Keep analog input traces (AIN0-AIN7) short and direct, with a grounded guard trace between adjacent channels to minimize crosstalk. The on-chip 2.5 V reference at REFIN/REFOUT requires a 0.1 uF ceramic bypass capacitor placed within 3 mm of the pin; do not route digital signals under the reference trace. For full bipolar input operation, place a low-ESR decoupling capacitor on VSS as well - the input ranges reference VSS, and any noise on VSS appears as input-referred conversion noise.
Estimated: Three common pitfalls when designing with the AD7327TRU-EP are: (1) Forgetting that input ranges are referenced to VSS, not AGND, when using +/-10 V or +/-5 V bipolar ranges. (2) Driving the analog inputs beyond the +/-15 V overvoltage clamp rating, which permanently damages the ESD diodes. (3) Failing to enable per-channel range programming in the control register - the part defaults to one range, not the last-programmed state. Read the AD7327-EP datasheet power-up sequence section before bringing up the device on a prototype board.
コンプライアンス情報
AQEC qualified per Analog Devices Enhanced Product standards. DSCC Drawing Number V62/14636. RoHS, REACH, lead-free, halogen-free, and conflict-minerals data not explicitly stated in the verified sources - confirm with the manufacturer datasheet before aerospace program commitment.
