AD7893AR-2REEL7 - 12-Bit 6µs Serial ADC | Analog Devices
부품 번호: AD7893AR-2REEL7 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.95 | $1,395.00 |
| 500 | $12.3 | $6,150.00 |
| 1,000 | $10.85 | $10,850.00 |
AD7893AR-2REEL7 개요
A successive-approximation ADC is a converter architecture that uses a binary-search algorithm across an internal DAC to converge on the input voltage in N clock cycles, where N is the resolution in bits. The SAR architecture is favored for multiplexed data acquisition, motor control feedback loops, and instrumentation because it provides deterministic latency, low latency (single-cycle conversion), and excellent DC accuracy with no pipeline delay. The AD7893AR-2 sits in the broader data-converter taxonomy: ADC -> SAR ADC -> 12-bit ADC -> single-channel serial ADC -> precision data-acquisition IC. Its bipolar ±10V input on a +5V rail is achieved through on-chip input attenuation that allows the part to digitize industrial-level signals without external resistor dividers.
Key features include AC and DC specifications such as ±1 LSB INL (typical), 70 dB SNR (typical, with input signal near full scale), and a fast 6µs conversion time that supports sampling rates up to 117 kSPS. The single +5V supply and two-wire serial interface reduce pin count to 8, simplifying board layout in space-constrained designs. The on-chip track/hold amplifier eliminates the need for an external sample-and-hold, reducing BOM cost and analog front-end complexity. Operating from -40°C to +85°C industrial temperature range and supplied on a 7-inch reel (REEL7) for high-volume assembly.
Architecturally, the AD7893 uses a capacitive-charge-redistribution DAC core (LC2MOS) that delivers low power dissipation, typically 25 mW, plus a precision comparator and SAR register. The two-wire serial interface is compatible with most popular microcontrollers and DSPs, supporting read-only serial data transfer that allows direct connection to SPI, QSPI, and MICROWIRE ports with minimal glue logic. The integrated clock eliminates external timing components and ensures deterministic 6µs conversion regardless of MCU speed.
Typical applications include industrial process control front-ends, data-acquisition boards for PLCs and measurement instruments, motor-control current/voltage monitoring, portable instrumentation that needs bipolar ±10V input on a single supply, and medical monitoring equipment requiring 12-bit resolution. The small 8-pin SOIC footprint makes the device attractive for high-density PCB layouts where 12-bit accuracy, bipolar input range, and serial output are simultaneously required.
A key design consideration is that the analog input pin must be driven by a low-impedance source or buffered op-amp; the AD7893's input sampling architecture draws transient charge that can degrade linearity if the source impedance exceeds specification. Decouple VDD with a 0.1µF ceramic capacitor placed within 5 mm of the supply pin, and route the analog input trace over a continuous ground plane to minimize conversion noise. The REEL7 suffix indicates the part is shipped on a 7-inch reel (1,000-piece reel) suitable for high-volume automated pick-and-place assembly.
This page synthesizes distributor pricing, drop-in same-brand and cross-brand alternatives, and practical design notes not consolidated in the manufacturer datasheet.
드롭인 대체품: AD7893AR-2REEL7 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: AD7893AR-2REEL7 (동일 폼 팩터 및 풋프린트) — 차이점: Conversion Time, Input Type, Package, Architecture, Data Interface.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AD7893AR-10REEL
✅ 드롭인✓ 재고 있음
$11.2 / 개
데이터시트 보기 →AD7893ARZ-2REEL7
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7893BRZ-10REEL7
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7892AR-1
✅ 드롭인✓ 재고 있음
$11.2 / 개
데이터시트 보기 →AD7892BR-1
✅ 드롭인✓ 재고 있음
$38.9 / 개
데이터시트 보기 →AD7893AR-2REEL7 최대 정격 & 전기적 특성
| 분해능 | 12 bits |
| Architecture | SAR (Successive Approximation) |
| Number of Input Channels | 1 |
| Conversion Time | 6 µs (typical) |
| Maximum Sample Rate | 117 kSPS |
| 입력 전압 범위 | -10 V to +10 V (bipolar, ±10V on -2 variant) |
| 공급 전압 | +5 V single supply |
| Power Dissipation | 25 mW (typical, per datasheet) |
| Integral Non-Linearity (INL) | ±1 LSB (typical) |
| Signal-to-Noise Ratio (SNR) | 70 dB (typical) |
| Input Type | Bipolar, single-ended |
| 인터페이스 | Serial, two-wire (SPI/QSPI/MICROWIRE compatible) |
| 동작 온도 범위 | -40°C to +85°C (industrial) |
| 패키지 | 8-pin SOIC |
| Package Code | SOP-8 / SOIC-8 |
| 실장 유형 | Surface Mount |
| Screening Level | Industrial |
| Terminal Form | Gull Wing |
AD7893AR-2REEL7 핀 구성
| 핀 1 | VDD — +5 V analog supply |
| 핀 2 | VIN — Analog input, bipolar ±10 V (AR-2 variant) |
| 핀 3 | GND — Analog ground |
| 핀 4 | REF — Reference voltage input (2.5 V typical) |
| 핀 5 | CONVST — Convert start, active low |
| 핀 6 | SDATA — Serial data output |
| 핀 7 | SCLK — Serial clock input |
| 핀 8 | NC — Not connected (per datasheet) |
일반적인 애플리케이션
AD7893AR-2REEL7 적합 용도: 7 애플리케이션s: Industrial Process Control PLC Analog Inputs, Data Acquisition Systems (DAS), Motor Control Current/Voltage Monitoring, Portable Test & Measurement Instrumentation, Medical Monitoring Front-Ends, Generic Industrial Sensor Readout Boards, Power Quality Monitoring / Battery Management.
Industrial Process Control PLC Analog Inputs
The AD7893AR-2REEL7 is ideally suited for industrial process-control analog input modules where direct ±10V bipolar signal conditioning is required. The -2 suffix input range matches the standard industrial voltage level produced by 4-20mA current loop terminations and shunts, eliminating the need for external resistor divider networks. With 6µs conversion time and 117 kSPS throughput, the part can digitize up to 117 single-ended channels per second in time-division multiplexing schemes common to PLC analog input cards. The SOIC-8 footprint enables high channel density on multi-channel PCBs, while the serial interface allows several ADCs to share a single SPI bus with individual chip-select lines. For PLC applications requiring reliability and EMC robustness, the LC2MOS process and industrial -40°C to +85°C temperature range provide the ruggedness demanded by factory-floor equipment.
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Data Acquisition Systems (DAS)
The AD7893AR-2REEL7 serves as a high-performance front-end element in multi-channel data-acquisition systems where 12-bit resolution, bipolar ±10V input, and a compact serial interface are simultaneously required. Its on-chip track/hold amplifier and 6µs conversion time support single-shot or sequential channel scanning at 117 kSPS aggregate throughput. Because the part uses a two-wire serial interface, eight or more AD7893 devices can multiplex onto a single SPI bus with individual convert-start lines, allowing a single host microcontroller to digitize dozens of channels without sacrificing throughput. The bipolar input range pairs well with industrial sensors such as thermocouple amplifiers, load-cell bridges, and pressure transducers. The 8-pin SOIC footprint keeps the per-channel bill of materials low while the deterministic latency simplifies timing synchronization in distributed-sampling applications.
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Motor Control Current/Voltage Monitoring
The AD7893AR-2REEL7's 6µs deterministic latency makes it an excellent fit for digital motor-control current-sense and DC-bus voltage-feedback loops where ADC pipeline delay would distort the control algorithm. The bipolar ±10V input range accepts directly the output of current-sense amplifiers (e.g., AD8418, INA240) and shunt-amplifier stages without external scaling resistors, reducing BOM count. With 12-bit resolution and 70 dB typical SNR, the part provides sufficient dynamic range for field-oriented control (FOC) algorithms in permanent-magnet synchronous motor (PMSM) and brushless DC (BLDC) drives. The 117 kSPS throughput supports current-loop update rates exceeding 50 kHz, well above the 20 kHz bandwidth typical of motor-control inner loops. The compact SOIC-8 footprint allows placement close to the shunt resistors, minimizing analog trace lengths and improving noise immunity.
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Portable Test & Measurement Instrumentation
Battery-powered test instruments and handheld measurement devices benefit from the AD7893AR-2REEL7's 25 mW typical power dissipation combined with its bipolar ±10V input range, allowing a single ADC to handle ground-referenced ±10V signals and battery-rail-monitor signals without additional signal conditioning. The two-wire serial interface minimizes MCU pin count, leaving more GPIOs available for display, keypad, and BLE module interfacing typical of portable T&M products. The 8-pin SOIC footprint drops onto a thin handheld-PCB layout where every square millimeter matters. Operating over the full -40°C to +85°C industrial temperature range ensures reliable operation in field-deployed instruments exposed to seasonal temperature swings. The deterministic 6µs conversion time and on-chip track/hold simplify digital-filter design in firmware.
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Medical Monitoring Front-Ends
The AD7893AR-2REEL7's 12-bit resolution and bipolar ±10V input are well-matched to patient-monitoring front-ends processing biopotential signals (ECG, EMG, EEG) after low-noise instrumentation-amplifier conditioning. Its 70 dB typical SNR provides sufficient dynamic range for capturing millivolt-level bioelectric signals alongside ±10V DC-bias offsets after instrumentation-amplifier output scaling. The two-wire serial interface keeps isolation barrier costs low in IEC 60601-1 patient-isolated devices because only the SCLK and SDATA lines need to pass through the isolator. The 6µs conversion time supports per-channel sampling rates up to 117 kSPS, ample for ECG bandwidth (typically 0.05-150 Hz) even in multi-channel lead configurations. Per-channel SOIC-8 footprint simplifies PCB placement near electrode leads and isolation amplifiers.
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Generic Industrial Sensor Readout Boards
The AD7893AR-2REEL7 is a high-utility choice for general-purpose industrial sensor-readout PCBs that must accept a mix of bipolar and unipolar signals from transducers such as pressure sensors, strain-gauge bridges, thermocouples, and 4-20mA current-loop transmitters. The bipolar ±10V input range lets the same ADC pin accept both sensor outputs and DC-bias voltages, simplifying the analog front-end. With 12-bit resolution, the part resolves a ±10V full-scale signal into 4.88 mV LSB steps, sufficient for many instrumentation applications. The two-wire serial interface can be shared across multiple ADCs on a SPI bus with discrete CONVST lines, enabling a single MCU host to read many channels. The SOIC-8 footprint supports tape-and-reel pick-and-place assembly for low-cost high-volume OEM production.
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Power Quality Monitoring / Battery Management
The AD7893AR-2REEL7's bipolar ±10V input and 117 kSPS throughput support power-quality metering and battery-cell monitoring applications where instantaneous voltage and current samples are needed for RMS, THD, and Coulomb-counting calculations. The 6µs conversion time enables >10 kHz sampling per channel on the 50/60 Hz fundamental frequency plus harmonics above 20 kHz. The serial interface can be read by a power-metering DSP or microcontroller across an isolation barrier with minimal optocoupler channels. Operating from a single +5V supply, the ADC integrates cleanly into battery-pack monitor boards already powered by a 5V rail generated from the battery stack. The industrial temperature range supports outdoor or under-hood battery and inverter installations.
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추천 제품 요약
엔지니어링 참조 데이터: AD7893AR-2REEL7 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AD7893AR-10REEL | AD7893ARZ-2REEL7 | AD7893BRZ-10REEL7 | AD7892AR-1 | AD7892BR-1 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | SOIC-8 | SOIC-8 (same) | SOIC-8 (same) | SOIC-8 (same) | SOIC-8 (same) | SOIC-8 (same) |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits (B-grade) |
| Input Voltage Range | -10 V to +10 V (bipolar) | 0 V to +5 V (unipolar) | -10 V to +10 V (bipolar) | 0 V to +5 V (unipolar) | 0 V to +5 V (unipolar) | 0 V to +5 V (unipolar) |
| Conversion Time | 6 µs | 6 µs | 6 µs | 6 µs | 1.47 µs | 1.47 µs |
| Maximum Sample Rate | 117 kSPS | 117 kSPS | 117 kSPS | 117 kSPS | 500 kSPS | 500 kSPS |
| INL | ±1 LSB (typical) | ±1 LSB (typical) | ±1 LSB (typical) | ±0.5 LSB (typical, B-grade) | ±1 LSB (typical) | ±0.5 LSB (typical, B-grade) |
| Interface | Two-wire serial (SPI-compatible) | Two-wire serial (compatible) | Two-wire serial (compatible) | Two-wire serial (compatible) | Two-wire serial (compatible) | Two-wire serial (compatible) |
주요 차별점
- Bipolar ±10V input on a single +5 V supply (vs AD7893AR-10REEL)
- Deterministic 6 µs SAR conversion latency (vs AD7265BCPZ-REEL)
- On-chip track/hold and clock (vs AD7828KPZ-REEL)
- Industrial -40°C to +85°C operating range (vs AD7472ARUZ-REEL (commercial-grade))
설계 노트
Estimated: With VDD = +5 V and typical quiescent current of ~5 mA (per datasheet typical power dissipation of 25 mW), the AD7893AR-2REEL7 draws 5 mA from the +5 V rail. Place a 0.1 µF ceramic decoupling capacitor within 5 mm of the VDD pin and a 10 µF bulk capacitor at the PCB supply input. Use a low-noise linear regulator (e.g., ADR01) for VDD if the +5 V rail is shared with switching circuitry. For the REF pin, drive with a stable 2.5 V reference (e.g., AD780); a 10 µF tantalum bypass capacitor on REF minimizes conversions noise.
The analog input pin (VIN) presents a transient charge load during sampling; for accurate 12-bit conversion, the source impedance must be kept below ~1 kΩ. Buffer the input with a low-offset op-amp (e.g., AD8628) if the source impedance exceeds this threshold. Keep analog input traces short, surrounded by a continuous ground plane on the top layer. Route the SCLK and SDATA traces away from analog input traces and noisy power planes. Use 5 mil minimum trace width with 8 mil spacing for digital lines to minimize crosstalk.
Common pitfalls include (1) driving VIN directly from high-impedance sensors without buffer op-amps, causing linearity degradation; (2) omitting the REF bypass capacitor, leading to conversion noise on lower bits; (3) connecting SCLK to a continuously-clocked source without gating, which can cause false starts on the CONVST edge; (4) using excessively long PCB traces between the ADC and isolation barrier in patient-isolated designs. Always verify timing with the datasheet timing diagram for t_CONV, t_ACQ, and t1-t4 interface timing parameters before final BOM release.
The AD7893 dissipates approximately 25 mW (typical) at +5 V supply - within the SOIC-8's thermal envelope without external heatsinking. Although the -40°C to +85°C junction temperature range is comfortable, locating the ADC near heat sources (LDOs, MCU, power inductors) on the PCB may push junction temperature toward its limit. Maintain copper pour on the GND pin for thermal relief. In a multi-channel PCB, distribute ADC placement to avoid thermal clustering near switching regulators.
규정 준수 정보
Per ADI product page: industrial grade, -40°C to +85°C, RoHS compliant, lead-free. Not AEC-Q100 qualified - choose automotive-grade ADI SAR ADC parts (e.g., AD7274WBRT) for AEC-Q100 automotive applications. Halogen-free status not explicitly confirmed - set to unknown.
