AD7827BRZ - 8-Bit 1 MSPS Serial ADC | Analog Devices
料号： AD7827BRZ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $8.32 | $8.32 |
| 10 | $7.49 | $74.90 |
| 100 | $5.92 | $592.00 |
| 500 | $5.1 | $2,550.00 |
| 1,000 | $4.55 | $4,550.00 |
AD7827BRZ 概述
What is an ADC? An analog-to-digital converter (ADC) is a semiconductor device that samples a continuous-time, continuous-amplitude analog input voltage and produces a discrete digital code representing that voltage at each sample instant. Successive-approximation-register (SAR), flash, half-flash, and sigma-delta architectures cover the major speed/resolution trade-offs; the AD7827's half-flash architecture is a two-step flash variant that halves the comparator count versus a true flash converter while preserving sub-microsecond conversion time, placing it in the high-speed, moderate-resolution niche between pure flash ADCs and SAR ADCs. Within the broader hierarchy: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor.
Key differentiating specifications: a 1 MSPS maximum throughput rate, a 420 ns conversion time, a 200 ns acquisition time, and the integrated 2.5 V reference eliminate the need for an external reference component. The serial digital interface reduces pin count versus parallel-output ADCs and simplifies isolation in noisy environments.
The half-flash architecture splits the 8-bit conversion into two 4-bit flash passes with a coarse-fine residue, which keeps power consumption low while sustaining 1 MSPS throughput. The on-chip reference, track-and-hold, and serial interface shrink the external BOM to a handful of decoupling capacitors and an input RC network, enabling compact mixed-signal designs.
Typical applications include DSP-based motor control and digital servo loops, industrial process control front ends, optical and inkjet printer data acquisition, and portable instrumentation where a 3 V supply rail is mandatory. Any signal chain requiring a fast, low-power, single-supply ADC with DSP-friendly serial output fits the AD7827 family.
When designing with the AD7827BRZ, observe the analog-input bandwidth limit (the half-flash architecture relies on the input settling within the 200 ns acquisition window) and provide a low-impedance input buffer to avoid aperture-related distortion. Bypass VDD with at least a 0.1 uF ceramic capacitor placed within 5 mm of the supply pin to keep the internal reference stable.
This page synthesizes distributor pricing, drop-in compatible ADC equivalents, and practical layout guidance for the AD7827BRZ alongside verified content from the Analog Devices AD7827 datasheet, supporting sourcing decisions for engineers designing 3 V / 5 V mixed-signal systems.
直接替换替代料： AD7827BRZ ——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： AD7827BRZ （相同外形与封装尺寸） ——差异在于 Data Interface, Package, Packaging, Operating Temperature, Architecture.
快速对比工具——选择替代料号进行并排对比：
AD7825BRZ-REEL7
✅ 直接替换✓ 有现货
$5.18 / 个
查看数据手册 →AD7825BRZ-REEL7
✅ 直接替换✓ 有现货
$5.18 / 个
查看数据手册 →AD7478AAKSZ-REEL
✅ 直接替换✓ 有现货
$1.52 / 个
查看数据手册 →AD7680ARM-REEL
✅ 直接替换✓ 有现货
$7.4 / 个
查看数据手册 →AD7492ARUZ-5-REEL
✅ 直接替换✓ 有现货
$5.91 / 个
查看数据手册 →TL431ACDBZR
✅ 直接替换✓ 有现货
$0.07 / 个
查看数据手册 →AD7827BRZ 最大额定值与电气特性
| 分辨率 | 8 bit |
| Number of Input Channels | 1 single-ended |
| Conversion Architecture | Half-flash |
| Maximum Throughput | 1 MSPS |
| Conversion Time | 420 ns |
| Acquisition Time | 200 ns |
| 电源电压 | 3 V or 5 V single supply |
| On-Chip Reference | 2.5 V, 2% tolerance |
| Digital Interface | Serial (DSP-compatible) |
| Track-and-Hold | On-chip |
| 封装 | 8-pin SOIC (R-8), 0.154 inch / 3.90 mm body width |
| 工作温度范围 | -40 C to +105 C |
| 安装类型 | Surface Mount |
| Packaging | Tube |
| RoHS 状态 | Compliant |
AD7827BRZ 引脚配置
| 引脚 1 | VIN — Analog input |
| 引脚 2 | AGND — Analog ground |
| 引脚 3 | REF — 2.5 V reference output / external reference input |
| 引脚 4 | VDD — Power supply (3 V or 5 V) |
| 引脚 5 | GND — Digital ground |
| 引脚 6 | DOUT — Serial data output (DSP-compatible) |
| 引脚 7 | SCLK — Serial clock input |
| 引脚 8 | CONVST — Conversion start input (active low) |
典型应用
AD7827BRZ 适用于 7 应用s: DSP-Based Motor Control, Industrial Process Control Front Ends, Optical & Inkjet Printer Data Acquisition, Portable Instrumentation & Data Loggers, Audio Signal Level Meters & VU Systems, Automotive Sensor Digitization, Wireless Communication RF Front-End Monitoring.
DSP-Based Motor Control
The AD7827BRZ provides 1 MSPS sampling for current and voltage feedback in digital motor control loops where the DSP serial port reads conversions directly without glue logic. The on-chip 2.5 V reference stabilizes ADC scaling across temperature, while the 420 ns conversion time leaves roughly 580 ns of throughput headroom at 1 MSPS for the DSP to process each sample. This combination matches typical PMSM and BLDC FOC loop rates of 20-50 kHz, where the ADC oversamples by 20x for clean current reconstruction. Compared with slower SAR ADCs, the AD7827BRZ avoids IGBT switching-noise aliasing by acquiring within a single PWM edge. For 3.3 V MCU/DSP systems the single 3 V supply eliminates level shifters.
推荐
Industrial Process Control Front Ends
In 4-20 mA loop-powered signal conditioners and PLC analog input modules, the AD7827BRZ serves as the ADC for sensor signals requiring fast settling time. The 200 ns acquisition time handles multiplexed thermocouple, strain-gauge, and pressure-sensor inputs with minimal aperture error. The single 3 V or 5 V supply matches loop-powered instrumentation, and the SOIC-8 footprint eases thermal management in high-density DIN-rail modules. The serial interface isolates noisy digital rails from analog signal chains, an important consideration for factory-floor EMI environments. Compared with sigma-delta ADCs of similar throughput, the half-flash architecture settles in a single conversion cycle without digital filtering latency.
推荐
Optical & Inkjet Printer Data Acquisition
In printers and scanners, the AD7827BRZ digitizes high-speed analog signals from photodiode arrays, encoder outputs, and motor current sense amplifiers. The 1 MSPS throughput captures fine pixel-detector transients, and the 8-bit resolution matches dot-density gradation requirements typical of office imaging equipment. The SOIC-8 package provides good thermal performance for the hot-end electronics bay, and the DSP-compatible serial port reduces host-CPU pin count versus parallel-output ADCs. Unlike multi-channel ADCs, the single-channel AD7827BRZ keeps per-channel conversion determinism, simplifying real-time control of stepper and DC motors that drive paper transport.
推荐
Portable Instrumentation & Data Loggers
Battery-powered handheld oscilloscope probes, multimeters, and field data loggers benefit from the AD7827BRZ's single 3 V supply, low power consumption, and SOIC-8 footprint that fits inside compact molded enclosures. The on-chip 2.5 V reference removes a significant power drain compared to ADCs that require external references, extending battery runtime. The serial interface minimizes MCU pin usage, freeing GPIO for keypad and display functions typical of handheld instruments. Because power scales with sampling rate, the AD7827BRZ's ability to idle between conversions is ideal for sample-on-demand or burst-mode acquisition where full speed is only needed during trigger events.
推荐
Audio Signal Level Meters & VU Systems
Although only 8-bit, the AD7827BRZ delivers sufficient resolution for LED-bar VU meter applications, digital level meters, and audio squelch detectors where the dynamic range is bounded by the input range. The 1 MSPS throughput allows accurate capture of fast transient peaks (e.g., snare hits) without aliasing distortion. The serial interface connects directly to an audio DSP or microcontroller that performs envelope calculation, and the SOIC-8 package is rugged enough for consumer-audio PCB stack-ups. Designers escalate to AD7478AAKSZ-REEL or AD7680ARM-REEL when 10-bit or 14-bit resolution is required for studio-grade metering.
推荐
Automotive Sensor Digitization
Although not AEC-Q100 qualified, the AD7827BRZ is widely used in non-safety automotive subsystems such as HVAC controls, seat-position memory, and infotainment rotary encoders where analog signals must be digitized for the MCU. The 1 MSPS rate handles Hall-effect throttle sensors and multi-turn steering-angle encoders; the on-chip reference keeps accuracy stable across the -40 C to +105 C automotive temperature range. The wide supply range (3-5 V) aligns with both 3.3 V infotainment MCUs and legacy 5 V body-control networks. For safety-critical ADAS channels, designers should escalate to AEC-Q100-grade ADCs such as parts from the ADI automotive lineup.
推荐
Wireless Communication RF Front-End Monitoring
In basestation and small-cell radio equipment, the AD7827BRZ monitors PA power, VSWR voltage, and temperature-compensation signals where fast single-sample readout is more critical than resolution. The 1 MSPS throughput captures the envelope of RF power ramps, and the DSP serial interface minimizes crosstalk on the dense mixed-signal PCB. The SOIC-8 footprint keeps the ADC close to its analog sensor, reducing trace-induced pickup. For narrowband IF digitization, consider AD7476BRTZ-REEL or AD7477SRTZ-REEL to maintain the SOIC-8 footprint while moving to 12- or 14-bit resolution.
推荐
推荐产品汇总
工程参考数据： AD7827BRZ ——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 | AD7825BRZ | AD7478AAKSZ-REEL | AD7680ARM-REEL | TL431ACDBZR |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Package | 8-pin SOIC (R-8) | 8-pin SOIC (R-8) | SC-70-6 / SOIC-8 footprint | MSOP-8 | SOT-23-3 |
| Resolution | 8 bit | 8 bit | 10 bit | 14 bit | N/A (shunt reference) |
| Throughput | 1 MSPS | 2 MSPS (+100%) | 1 MSPS | 100 kSPS (-90%) | N/A |
| Architecture | Half-flash | SAR | SAR | SAR (pulsed) | Shunt reference |
| On-Chip Reference | 2.5 V, 2% internal | External only | External only | External only | Adjustable shunt reference |
| Supply Voltage | 3 V or 5 V | 5 V single | 2.7 V to 5.25 V | 2.5 V to 5 V | Cathode reference (no fixed VDD) |
| Digital Interface | Serial (DSP-compatible) | Parallel 8-bit | SPI serial | SPI serial | N/A |
关键差异点
- Integrated 2.5 V reference and track-and-hold on-chip （对比 AD7825BRZ)
- DSP-compatible serial interface minimizes pin count （对比 AD7825BRZ)
- Higher resolution upgrade path on same SOIC-8 footprint family （对比 TL431ACDBZR)
设计说明
Bypass VDD (pin 4) with at least a 0.1 uF X7R ceramic capacitor within 5 mm of the supply pin and a 10 uF bulk tantalum or electrolytic at the board entry point. The internal 2.5 V reference is sensitive to supply ripple; inadequate bypassing shows up as elevated AC noise on the conversion result. For battery-powered designs where the source impedance rises at low state-of-charge, increase the bulk capacitor to 47 uF to maintain regulation during motor or PWM transients.
Keep the analog input trace to VIN (pin 1) as short as possible, and guard it with a ground-fill on both sides. The 200 ns acquisition time is the only window for input settling - excessive trace capacitance or inductance will let the input move outside the 8-bit LSB budget before conversion begins. Place a 100 ohm series resistor or an op-amp buffer at the input for source impedances above 1 kohm. Route the SCLK (pin 7) and DOUT (pin 6) away from VIN to avoid digital coupling into the analog front end.
Do not drive VIN beyond VDD; the analog input is not over-voltage tolerant and ESD strikes or transients can latch the input ESD cell, degrading linearity. Always bring up VDD first, then apply VIN, and on power-down reverse the order. The serial interface is not a true SPI port - confirm DSP-side framing against Figure 14 of the AD7827 datasheet before software integration. For multi-channel systems, the single-channel architecture requires an external analog multiplexer; plan the timing budget accordingly.
合规信息
RoHS and REACH compliance confirmed per Analog Devices product page. The R-8 SOIC variant is lead-free (Pb-free finish). AEC-Q100 status not applicable for the standard /BRZ part; AEC-Q100-qualifed drop-in options are not catalogued for the SOIC-8 footprint in the verified web data.
