AD7876BR-REEL - 12-Bit 100kHz SAR ADC, 24-SOIC | Analog Devices
料号： AD7876BR-REEL ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $17.2 | $172.00 |
| 100 | $15.4 | $1,540.00 |
| 500 | $13.85 | $6,925.00 |
| 1,000 | $12.3 | $12,300.00 |
| 3,000 | $10.95 | $32,850.00 |
AD7876BR-REEL 概述
An SAR (Successive Approximation Register) ADC is a type of analog-to-digital converter that uses a binary search algorithm and an internal capacitive DAC to convert an analog input voltage into a digital code over a fixed number of clock cycles. The AD7876 belongs to the broader data-converter hierarchy: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor. Built on Analog Devices' LC2MOS process, it integrates the entire signal path from analog input to digital word in a single IC, eliminating the external components required by older discrete ADC designs.
Key features include a 100 kHz throughput rate, 2 microsecond track-and-hold acquisition time, 8 microsecond ADC conversion time, an on-chip buried-Zener reference laser-trimmed for accuracy, and 72 dB signal-to-noise ratio. The device supports bipolar input ranges of +/-5 V or +/-10 V via the AD7876BR (BR suffix) and offers parallel, byte, and serial interface modes for flexible microcontroller or DSP connectivity. Operating from a single +5 V supply, it consumes approximately 70 mW of power.
The AD7876 uses a charge-redistribution switched-capacitor DAC architecture combined with a precision comparator and SAR logic to perform successive approximation. The internal reference and clock eliminate two of the most critical external components in ADC subsystems, reducing board area and improving long-term stability. Dynamic performance is specified for DSP users with SNR and harmonic distortion figures that make it suitable for both DC measurement and AC signal acquisition applications.
Typical applications include industrial process control and data acquisition, motor control feedback loops, instrumentation and test equipment, medical instrumentation signal conditioning, and spectrum analysis front-ends. The wide input range and integrated reference make it well suited for industrial 4-20 mA loop digitization with appropriate signal conditioning.
When designing with this device, decouple the +5 V supply with a 10 uF tantalum and 0.1 uF ceramic capacitor placed close to the supply pin. The analog input drive amplifier must settle within the 2 us acquisition window to avoid conversion errors. For best noise performance, keep digital and analog grounds separated and joined at a single star point near the ADC.
This page synthesizes distributor pricing from 6 sources, drop-in alternatives from the Analog Devices AD787x family and pin-compatible cross-brand parts, and practical design notes not consolidated on any single datasheet or distributor page.
直接替换替代料： AD7876BR-REEL ——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： AD7876BR-REEL （相同外形与封装尺寸） ——差异在于 Architecture, On-Chip Reference, Package, Track-and-Hold Acquisition Time.
快速对比工具——选择替代料号进行并排对比：
AD7876BR
✅ 直接替换📋 参考替代料（不在目录中）
AD7876BR-REEL7
✅ 直接替换📋 参考替代料（不在目录中）
AD7876CRZ
✅ 直接替换📋 参考替代料（不在目录中）
AD7876CRZ-REEL7
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AD7875LPZ-REEL
✅ 直接替换✓ 有现货
$15.68 / 个
查看数据手册 →AD7876BR-REEL 最大额定值与电气特性
| Number of Bits | 12 |
| 采样率 | 100 kSPS |
| Number of Inputs | 1 |
| Input Type | Single-Ended (bipolar +/-5 V or +/-10 V) |
| Data Interface | Parallel, Byte, Serial |
| Architecture | SAR (Successive Approximation Register) |
| Track-and-Hold Acquisition Time | 2 us |
| ADC Conversion Time | 8 us |
| On-Chip Reference | Yes (laser-trimmed buried Zener) |
| 电源电压 | +5 V |
| Power Dissipation | 70 mW (typical) |
| Signal-to-Noise Ratio | 72 dB |
| 封装 | 24-SOIC (0.295 in / 7.50 mm width) |
| 安装类型 | Surface Mount |
| Packaging | Tape & Reel (REEL suffix) |
| RoHS 状态 | Compliant |
AD7876BR-REEL 引脚配置
| 引脚 1 | VREF — Reference voltage output (decoupling) |
| 引脚 2 | AGND — Analog ground |
| 引脚 3 | AIN — Analog input |
| 引脚 4 | R1 — Input range scaling resistor pin 1 |
| 引脚 5 | R2 — Input range scaling resistor pin 2 |
| 引脚 6 | REF IN — Reference input (decoupling) |
| 引脚 7 | VDD — +5 V supply |
| 引脚 8 | DGND — Digital ground |
| 引脚 9 | CLK — Clock input |
| 引脚 10 | CONVST — Conversion start (active low) |
| 引脚 11 | BUSY — Busy output (active high during conversion) |
| 引脚 12 | CS — Chip select (active low) |
| 引脚 13 | RD — Read input (active low) |
| 引脚 14 | DB11 — Data output bit 11 (MSB) |
| 引脚 15 | DB10 — Data output bit 10 |
| 引脚 16 | DB9 — Data output bit 9 |
| 引脚 17 | DB8 — Data output bit 8 |
| 引脚 18 | DB7 — Data output bit 7 |
| 引脚 19 | DB6 — Data output bit 6 |
| 引脚 20 | DB5 — Data output bit 5 |
| 引脚 21 | DB4 — Data output bit 4 |
| 引脚 22 | DB3 — Data output bit 3 |
| 引脚 23 | DB2 — Data output bit 2 |
| 引脚 24 | DB1 — Data output bit 1 (LSB) |
典型应用
AD7876BR-REEL 适用于 7 应用s: Industrial Process Control Data Acquisition, Motor Control Feedback Loops, Instrumentation and Test Equipment, Medical Instrumentation Signal Acquisition, Spectrum Analysis and DSP Front-End, Audio and Communication Signal Conditioning, Battery Monitoring and Power Management.
Industrial Process Control Data Acquisition
The AD7876BR-REEL's 12-bit resolution and 100 kSPS throughput suit it for industrial process control loops where sensor signals must be digitized at high speed. The +/-10 V bipolar input range via the BR scaling network accepts 4-20 mA loop signals after a sense resistor, while the 72 dB SNR preserves measurement accuracy for closed-loop control. The on-chip laser-trimmed reference eliminates drift concerns in 24/7 plant operation.
推荐
Motor Control Feedback Loops
Brushless DC and AC servo motor controllers need fast, accurate phase current and position feedback digitization. The AD7876BR-REEL's 2 us track-and-hold and 100 kSPS rate allow current-sense amplifier outputs to be sampled synchronously with PWM switching. The parallel interface provides the low-latency data transfer required for field-oriented control (FOC) algorithms running on DSPs and microcontrollers.
推荐
Instrumentation and Test Equipment
Digital multimeters, oscilloscope front-ends, and bench-top data loggers benefit from the AD7876BR-REEL's integrated architecture and flexible interface. The on-chip reference simplifies calibration, while the parallel/byte/serial interface selection accommodates legacy microcontroller displays and modern DSP back-ends. The 12-bit accuracy is sufficient for general-purpose measurement; for higher precision, the AD786x 14-bit family is recommended.
推荐
Medical Instrumentation Signal Acquisition
Patient monitoring and diagnostic equipment digitize low-frequency biosignals at moderate sample rates. The AD7876BR-REEL's 100 kSPS is overkill for ECG (typically 500 Hz) but useful for high-bandwidth modalities like ultrasound pre-beamforming and evoked-potential capture. The integrated reference and small SOIC footprint simplify the compact PCB layouts required for portable medical devices.
推荐
Spectrum Analysis and DSP Front-End
Wideband spectrum analyzers and software-defined radio front-ends digitize IF signals at high sample rates for FFT processing. The AD7870 and AD7875 are the AD7876 family members specifically specified for dynamic performance (SNR, harmonic distortion, intermodulation distortion) required by DSP users. The AD7876BR-REEL can serve these applications when dynamic specs are not the primary concern, such as in calibration or telemetry channels.
推荐
Audio and Communication Signal Conditioning
Audio mixing consoles, communications receivers, and base-band signal processors use moderate-resolution ADCs in the audio band. The AD7876BR-REEL's 72 dB SNR provides sufficient dynamic range for voice-band digitization, and its parallel interface can stream samples directly into a DSP for real-time filtering. While not a high-fidelity audio ADC, it is well suited for industrial audio and intercom systems where cost is paramount.
推荐
Battery Monitoring and Power Management
Battery management systems in UPS, telecom, and electric-vehicle applications monitor cell voltages, pack current, and temperature. The AD7876BR-REEL's +/-10 V input range accepts voltages from multi-cell battery stacks via simple resistor dividers, and the 100 kSPS rate enables simultaneous monitoring of multiple cells through an external multiplexer. The low 70 mW power consumption from a single +5 V rail suits thermally-constrained battery packs.
推荐
推荐产品汇总
工程参考数据： AD7876BR-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 | AD7876BR | AD7876BR-REEL7 | AD7876CRZ | AD7876CRZ-REEL7 | AD7875LPZ-REEL |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 24-SOIC wide (7.50 mm) | 24-SOIC wide - same | 24-SOIC wide - same | 24-SOIC wide - same | 24-SOIC wide - same | 24-LCCC variant |
| 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 |
| Input Range (Bipolar) | +/-5 V or +/-10 V (BR scaling) | +/-5 V or +/-10 V (BR scaling) | +/-5 V or +/-10 V (BR scaling) | Commercial grade scaling (differs from BR) | Commercial grade scaling (differs from BR) | AD7875 family bipolar scaling |
| On-Chip Reference | Yes (laser-trimmed) | Yes | Yes | Yes | Yes | Yes |
| Data Interface | Parallel/Byte/Serial | Parallel/Byte/Serial | Parallel/Byte/Serial | Parallel/Byte/Serial | Parallel/Byte/Serial | Parallel/Byte/Serial |
| Packaging Form | Tape & Reel (13-inch) | Tube | Tape & Reel (7-inch) | Tube | Tape & Reel (7-inch) | Tape & Reel |
关键差异点
- Same family SOIC-24 footprint enables BOM flexibility （对比 AD7876BR)
- Standard 13-inch reel for high-volume manufacturing （对比 AD7876BR-REEL7)
- BR-suffix bipolar input range scaling （对比 AD7876CRZ)
设计说明
Estimated: Decouple the AD7876BR-REEL's +5 V supply with a 10 uF tantalum bulk capacitor and a 0.1 uF ceramic capacitor placed within 5 mm of the VDD pin. The ADC draws approximately 14 mA (70 mW / 5 V) plus transient currents during conversion; poor decoupling causes reference noise that couples into the conversion result. For best performance, use a linear regulator for the analog supply rather than a switching converter.
Keep analog and digital grounds separated on the PCB and join them at a single star-point near the ADC's AGND pin. The wide-body SOIC package provides adequate thermal dissipation at 70 mW, but the exposed lead frame should be soldered to a ground pour for both thermal and EMI reasons. Route digital outputs (DB1-DB11) away from the analog input traces to minimize digital-to-analog crosstalk.
The drive amplifier at the AIN pin must settle to 12-bit accuracy within the 2 us acquisition window. An op-amp with insufficient slew rate or bandwidth causes gain errors and noise pickup. Verify that the input amplifier's settling time is at least 4x faster than the acquisition window. Also note that the BR-suffix scaling resistors set the +/-5 V or +/-10 V range; omitting them or selecting wrong values causes input-range errors. Reference warmup time after power-on is required before accurate conversions.
合规信息
RoHS compliant per Analog Devices product page. REACH compliant per manufacturer datasheet. No AEC-Q100 automotive qualification - choose AD7862AR-10REEL7 automotive variant for vehicle applications. Halogen-free per manufacturer datasheet.
