AD7893BR-10REEL - 12-Bit 117kSPS Serial Bipolar ADC | Analog Devices
MPN： AD7893BR-10REEL ✓ 啟用中AD7893BR-10REEL 概覽
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that converts a continuous analog voltage into a discrete digital code. SAR ADCs use a binary-search successive-approximation algorithm with an internal track-and-hold amplifier, achieving an excellent balance of speed, resolution, and power consumption. The AD7893 is fabricated on Analog Devices' LC2MOS process, which combines precision bipolar analog circuits with low-power CMOS logic, sitting within the broader hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor.
Key features of the AD7893BR-10 include 12-bit resolution with no missing codes, an on-chip track-and-hold amplifier, a 117 kSPS throughput rate, and a serial data interface with daisy-chain capability. Typical power consumption is 25 mW during conversion, falling to a low standby current between conversions, making the device well suited to portable, battery-powered, and power-conscious designs. Dynamic performance is specified for harmonic distortion and signal-to-noise ratio in addition to traditional DC accuracy parameters such as integral and differential nonlinearity.
Typical applications include industrial process control front ends, data acquisition systems, portable instrumentation, motor control feedback paths, and any DSP-based signal chain that requires a compact, single-supply 12-bit ADC. The wide +/-10 V bipolar input eliminates the need for external signal conditioning in many transducer bridge and process-control front ends. Designers should add 0.1 microfarad decoupling capacitors close to the supply pin and observe the analog/digital ground separation recommended in the datasheet to achieve specified dynamic performance.
直接替換替代品，適用於 AD7893BR-10REEL — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： AD7893BR-10REEL （相同外形與佔位） — 差異在於 Conversion Time, Architecture, Input Type, Operating Temperature, Package.
AD7893AR-10REEL
✅ 直接替換聯絡詢價
查看資料表 →AD7893BRZ-10REEL7
✅ 直接替換📋 參考替代品（不在目錄中）
AD7893BR-10REEL7
✅ 直接替換聯絡詢價
查看資料表 →AD7893ARZ-10REEL
✅ 直接替換聯絡詢價
查看資料表 →AD7893BR-10
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
AD7893BR-10REEL 最大額定值與電氣特性
| 解析度 | 12 bits |
| 取樣率 | 117 kSPS |
| Conversion Time | 6 microseconds |
| Number of Inputs | 1 |
| Input Type | Single-Ended, Bipolar |
| 輸入電壓範圍 | +/-10 V |
| Architecture | SAR (Successive Approximation) |
| Data Interface | Serial (high-speed) |
| 供應電壓 | +5 V single supply |
| Power Consumption (active) | 25 mW (typical) |
| 封裝 | 8-SOIC (0.154 inch, 3.90 mm width) |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40C to +85C (commercial) |
| On-Chip Track/Hold | Yes |
| Process Technology | LC2MOS (Linear Compatible CMOS) |
| Packaging | Tape and Reel |
AD7893BR-10REEL 腳位配置
| 腳位 1 | VDD — +5 V analog and digital supply |
| 腳位 2 | VIN — Analog input, +/-10 V bipolar |
| 腳位 3 | AGND — Analog ground |
| 腳位 4 | DGND — Digital ground |
| 腳位 5 | SCLK — Serial clock input |
| 腳位 6 | DOUT — Serial data output |
| 腳位 7 | CONVST — Conversion start, active low |
| 腳位 8 | REF — Reference voltage |
典型應用
AD7893BR-10REEL 適用於 6 應用s: Industrial Process Control Front End, Data Acquisition Systems, Motor Control Feedback Loops, Portable Battery-Powered Instrumentation, DSP-Based Audio and Signal Processing Front Ends, Medical Monitoring Devices.
Industrial Process Control Front End
The AD7893BR-10REEL's +/-10 V true bipolar input range directly accepts the +/-10 V signal levels produced by industrial process-control transducers, eliminating external signal conditioning or level-shifting circuitry. With 12-bit resolution and 117 kSPS throughput, the ADC samples PLC analog input modules faster than the typical 4-10 ms scan cycle of most PLCs. Place the ADC close to the input connector with 0.1 microfarad decoupling on VDD, isolate analog and digital grounds at the AGND/DGND pins, and route the serial data into a microcontroller or DSP for scaling and linearization. Compared to using a separate op-amp gain stage plus a unipolar ADC, the AD7893BR-10REEL reduces BOM count by 30-50 percent while preserving DC accuracy.
推薦
Data Acquisition Systems
Multi-channel data acquisition systems use the AD7893BR-10REEL per channel or with an external analog multiplexer to digitize transducer and sensor signals at 117 kSPS. The 12-bit resolution delivers 0.024 percent full-scale accuracy, sufficient for general-purpose measurement of strain gauges, thermocouple amplifiers, and pressure transducers. The serial interface simplifies PCB routing versus parallel-output ADCs and allows daisy-chaining of multiple AD7893 devices for synchronized multi-channel sampling. Designers should oversample by 4x to 16x and average to improve effective resolution to 13-14 bits ENOB in DC measurement applications.
推薦
Motor Control Feedback Loops
Motor control servo drives and BLDC controllers use the AD7893BR-10REEL to sample phase current, DC bus voltage, and analog command inputs at the 117 kSPS rate required for sub-100 microsecond current-loop update intervals. The +/-10 V bipolar input directly digitizes current-sense amplifier outputs with no additional signal conditioning, while the on-chip track-and-hold supports input slew rates well above the typical 5-20 kHz PWM-induced ripple seen in motor phases. According to the ADI datasheet, the ADC maintains SNR above 68 dB at input frequencies up to 50 kHz, which is critical for accurate current measurement under PWM common-mode transients.
推薦
Portable Battery-Powered Instrumentation
The AD7893BR-10REEL consumes only 25 mW typical during conversion and falls to a much lower standby current between conversions, making it ideal for handheld digital multimeters, portable medical monitors, and battery-powered field instruments. The 8-SOIC package occupies less than 30 square millimeters of PCB area, fitting easily into compact handheld enclosures. According to the ADI datasheet, the part operates from a single +5 V supply compatible with USB-powered or 4-cell NiMH / single-cell Li-ion plus boost converter rails. Designers should power down the ADC between conversions using the CONVST pin to extend battery life to hundreds of hours.
推薦
DSP-Based Audio and Signal Processing Front Ends
Audio front ends and signal-processing platforms use the AD7893BR-10REEL to digitize analog input signals for downstream DSP analysis in applications such as acoustic analyzers, vibration monitors, and instrumentation microphones. The 117 kSPS sampling rate easily covers the 20 kHz audio band and provides 5x oversampling for anti-aliasing filter relaxation. The serial interface connects directly to the serial port of popular DSP families including Blackfin and SHARC without external logic. Place a 10 kilohm input series resistor and 1 nanofarad capacitor on the analog input to form a single-pole anti-aliasing filter at the Nyquist frequency.
推薦
Medical Monitoring Devices
Patient monitoring equipment such as infusion pumps, pulse oximeters, and bedside monitors incorporate the AD7893BR-10REEL for digitizing analog sensor signals at 117 kSPS with 12-bit resolution. The bipolar +/-10 V input accommodates a wide range of analog front-end outputs from instrumentation amplifiers, while the small 8-SOIC package helps achieve the compact PCB layouts required for wearable and bedside form factors. The LC2MOS process provides low noise and good DC accuracy needed to resolve low-amplitude physiological signals. Designers should add ESD protection diodes on the analog input and follow IEC 60601 isolation guidelines when designing the patient-connected analog front end.
推薦產品摘要
工程參考資料，適用於 AD7893BR-10REEL — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | AD7893AR-10REEL | AD7893BRZ-10REEL7 | AD7893BR-10REEL7 | AD7893ARZ-10REEL | AD7893BR-10 |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Input Voltage Range | +/-10 V bipolar | +/-5 V bipolar | +/-10 V bipolar | +/-10 V bipolar | +/-5 V bipolar | +/-10 V bipolar |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate | 117 kSPS | 117 kSPS | 117 kSPS | 117 kSPS | 117 kSPS | 117 kSPS |
| Data Interface | Serial | Serial | Serial | Serial | Serial | Serial |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
主要差異化特點
- True +/-10 V bipolar input on a single +5 V supply (對比AD7893AR-10REEL)
- LC2MOS process for low power and high accuracy (對比Generic 12-bit SAR ADCs)
- High-speed serial interface with daisy-chain capability (對比Parallel-output 12-bit ADCs)
設計說明
Place a 0.1 microfarad ceramic decoupling capacitor as close as possible to the VDD pin (pin 1) and a 10 microfarad tantalum or ceramic bulk capacitor on the same supply trace within 0.25 inch. The AD7893BR-10REEL draws 25 mW during conversion and switches high transient currents at the conversion start edge; inadequate decoupling will degrade SNR and may inject digital noise into the analog input via supply coupling. Use a wide analog supply trace and route VDD directly from a low-noise 5 V LDO such as ADP3338 rather than from a switching regulator output.
Separate the analog and digital ground planes and tie them together at a single point directly under the AGND/DGND pins (pins 3 and 4). Route the analog input trace on the analog layer and the SCLK/DOUT/CONVST traces on the digital layer, keeping them short and far from the analog input trace to minimize digital-to-analog crosstalk. The exposed analog input pin is high-impedance between conversions; a 10 kilohm series resistor close to the input pin forms a single-pole RC anti-aliasing filter when combined with the input capacitance of the IC and any external capacitor.
Do not exceed the absolute maximum +/-17 V input rating on VIN (pin 2) or permanent damage to the input ESD structure may occur. Always observe the input common-mode range relative to AGND during fault conditions and add external clamping diodes or a TVS if the upstream transducer can produce transients beyond the supply rails. The CONVST pin (pin 7) initiates conversion on its falling edge; the part requires a minimum CONVST pulse width specified in the datasheet and SCLK must be idle or in the correct state during conversion. Reading DOUT before the conversion completes will return erroneous data.
合規資訊
RoHS/REACH status for AD7893BR-10REEL not confirmed in provided web data; lead-free and halogen-free status unknown. The 'BR' (no Z) suffix typically indicates non-RoHS / SnPb finish per ADI historical nomenclature, while Z-suffixed variants (AD7893BRZ-10REEL7, AD7893ARZ-10REEL) are RoHS compliant. AEC-Q100 qualification not applicable - this is a commercial-grade ADC.