AD7899AR-3REEL - 14-Bit 400kSPS 5V ADC | Analog Devices
料号： AD7899AR-3REEL ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.62 | $166.20 |
| 100 | $14.78 | $1,478.00 |
| 500 | $13.05 | $6,525.00 |
| 1,000 | $11.62 | $11,620.00 |
AD7899AR-3REEL 概述
An ADC (analog-to-digital converter) is a data-conversion integrated circuit that translates real-world analog signals into discrete digital codes for downstream processing by microcontrollers, DSPs, FPGAs, or ASICs. Within the broader IC hierarchy, successive-approximation ADCs (SAR ADCs) sit between slow precision delta-sigma converters and high-speed flash converters, offering an attractive balance of resolution, sample rate, latency, and power consumption for general-purpose data acquisition. The AD7899 belongs to this SAR family, targeting applications that need deterministic single-conversion latency and moderate (14-bit) resolution without the complexity of a bipolar supply.
Key features: 14-bit resolution with no missing codes, 400 kSPS throughput, 2.0 µs acquisition time on the front-end track/hold, ±10 V true-bipolar input range on the -3 variant, single +5 V supply operation (no ±15 V rails required), and an internal 2.5 V reference that simplifies external BOM. The parallel interface allows direct connection to 8/16-bit microcontrollers, DSPs, or FPGA banks without glue logic, and the SOIC-28 wide-body package gives the part excellent thermal headroom for continuous sampling.
Typical applications include industrial process control loops (4-20 mA loop transmitters, multi-channel PLC analog front ends), motor control current/voltage sensing on 5 V supply rails, instrumentation and data-acquisition systems running on +5 V digital supplies, and optical/networked system monitoring boards. Designers select the AD7899AR-3REEL when they need true ±10 V input range, single +5 V supply, and 14-bit resolution on one die.
Design tip: Because the input stage divides down the ±10 V range to fit a 5 V ADC core, the analog input presents a finite source impedance of about 4 kohm in parallel with a few pF of capacitance; place an external op-amp buffer with low output impedance if the source impedance of the transducer is non-negligible. Operating the part at full 400 kSPS and feeding the LSBs requires attention to PCB layout - keep AGND/DAGND separation, decouple VDD with 10 µF + 100 nF, and route analog traces away from digital switching edges.
This page consolidates datasheet specifications, authorized distributor pricing, verified drop-in alternatives in the same SOIC-28 footprint, and PCB design guidance not always presented on the manufacturer datasheet cover page.
直接替换替代料： AD7899AR-3REEL ——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： AD7899AR-3REEL （相同外形与封装尺寸） ——差异在于 Conversion Time, Operating Temperature, Package, Supply Voltage (Single).
快速对比工具——选择替代料号进行并排对比：
AD7899ARZ-3REEL
✅ 直接替换📋 参考替代料（不在目录中）
AD7899AR-3
✅ 直接替换📋 参考替代料（不在目录中）
AD7899ARZ-3
✅ 直接替换📋 参考替代料（不在目录中）
AD7899AR-1REEL
✅ 直接替换📋 参考替代料（不在目录中）
AD7899AR-2REEL
✅ 直接替换📋 参考替代料（不在目录中）
AD7899AR-3REEL 最大额定值与电气特性
| 分辨率 | 14 bits |
| Number of Channels | 1 |
| Architecture | SAR (Successive Approximation) |
| Sample Rate | 400 kSPS |
| Acquisition Time (Track/Hold) | 0.3 µs |
| Conversion Time | 2.0 µs / 2.2 µs |
| Input Voltage Range (-3 variant) | ±10 V |
| Input Voltage Range (-1 variant) | 0 V to +5 V |
| Input Voltage Range (-2 variant) | ±5 V |
| Supply Voltage (Single) | +5 V (±5%) |
| Internal Reference | 2.5 V |
| 接口 | Parallel |
| 工作温度 | -40 °C to +85 °C |
| 封装 | 28-pin SOIC (Wide) |
| 安装类型 | Surface Mount |
| Lead-Free / RoHS | Compliant (per -REEL suffix marking convention) |
AD7899AR-3REEL 引脚配置
| 引脚 1 | DGND — Digital ground |
| 引脚 2 | DB0 — Parallel data bit 0 (LSB) |
| 引脚 3 | DB1 — Parallel data bit 1 |
| 引脚 4 | DB2 — Parallel data bit 2 |
| 引脚 5 | DB3 — Parallel data bit 3 |
| 引脚 6 | DB4 — Parallel data bit 4 |
| 引脚 7 | DB5 — Parallel data bit 5 |
| 引脚 8 | DB6 — Parallel data bit 6 |
| 引脚 9 | DB7 — Parallel data bit 7 |
| 引脚 10 | DB8 — Parallel data bit 8 |
| 引脚 11 | DB9 — Parallel data bit 9 |
| 引脚 12 | DB10 — Parallel data bit 10 |
| 引脚 13 | DB11 — Parallel data bit 11 |
| 引脚 14 | DB12 — Parallel data bit 12 |
| 引脚 15 | DB13 — Parallel data bit 13 (MSB) |
| 引脚 16 | EOC — End-of-conversion output |
| 引脚 17 | CONVST — Conversion start input |
| 引脚 18 | CS — Chip-select input |
| 引脚 19 | RD — Read input |
| 引脚 20 | BUSY — Busy output (during conversion) |
| 引脚 21 | DVDD — Digital +5 V supply |
| 引脚 22 | AVDD — Analog +5 V supply |
| 引脚 23 | VREF — Internal 2.5 V reference (decouple externally) |
| 引脚 24 | REFIN — External reference input (if unused, tie to internal VREF) |
| 引脚 25 | AGND — Analog ground |
| 引脚 26 | AIN+ — Analog input (positive) |
| 引脚 27 | AIN- — Analog input (negative / GND-sense for bipolar) |
| 引脚 28 | DGND — Digital ground (alternate bond) |
典型应用
AD7899AR-3REEL 适用于 6 应用s: Industrial Process Control / PLC Analog Front End, Motor Control Current/Voltage Sensing, Portable Data Acquisition Systems, Optical Module / Telemetry Monitoring, Test & Measurement / Bench Instrumentation, Audio/Broadcast Equipment Signal Acquisition.
Industrial Process Control / PLC Analog Front End
The AD7899AR-3REEL is well matched to industrial PLC analog front ends because its ±10 V true-bipolar input range directly digitizes legacy 4-20 mA loop outputs through a 250 ohm sense resistor (±10 V swing). The 14-bit no-missing-codes resolution provides 12+ effective bits at the typical 10 kSPS industrial update rate, and the 0.3 µs acquisition time captures fast transient events. Single +5 V operation removes the need for ±15 V rails in tightly packed PLC backplanes. Use a follower op-amp in front of the analog input to drive the ~4 kohm source impedance; parallel interface connects directly to the PLC host CPU.
推荐
Motor Control Current/Voltage Sensing
The AD7899AR-3REEL handles motor control current-sense and DC-bus voltage sensing where ±10 V input range accommodates shunt-derived signals at full PWM switching excursions. The 400 kSPS sample rate is faster than typical 10 kHz current-loop control bandwidths, enabling precise phase-current measurement at the FOC controller's required update rate. Its 2.5 V internal reference can also drive an external scaling divider chain, allowing ±12 V extended input when paired with a resistive divider + buffer. The robust SOIC-28 wide package offers excellent thermal headroom for continuous high-duty-cycle sampling in industrial servo drives.
推荐
Portable Data Acquisition Systems
The AD7899AR-3REEL suits portable data-acquisition modules because it works from a single +5 V USB-powered rail - no bulky ±15 V supplies needed - while still digitizing ±10 V transducers. The parallel interface allows direct connection to microcontrollers that lack ADC resources, with 400 kSPS throughput sufficient for audio-bandwidth vibration, strain, or acoustic measurements. The internal 2.5 V reference eliminates one precision analog rail entirely, simplifying BOM. Designers should use the AR-3REEL variant when the transducer spans ±10 V (e.g., load cells, accelerometers), reducing system cost vs. external signal-conditioning chains.
推荐
Optical Module / Telemetry Monitoring
The AD7899AR-3REEL monitors supply rails and bias currents in optical line-card and telemetry modules, digitizing analog telemetry with ±10 V input headroom to handle supervisory voltages above the 5 V logic rails. The 400 kSPS throughput is plenty for supervisory loops that update at 100 Hz, with spare bandwidth for capturing transient alarms. Its 28-pin SOIC wide package footprint mates cleanly to telecom line-card PCB standards, and the single +5 V supply matches existing power-distribution ICs in the system. The internal 2.5 V reference can also drive other ADCs via the AGND plane.
推荐
Test & Measurement / Bench Instrumentation
The AD7899AR-3REEL suits bench-top multimeters and data loggers where 14-bit resolution over a ±10 V input range delivers 1.22 mV LSB and DC accuracy suitable for general-purpose instrumentation. The 400 kSPS burst rate is fast enough for handheld oscilloscope-style trigger capture, while the deterministic 2.0 µs SAR conversion time avoids the latency of oversampled converters. The wide-body SOIC package handles continuous high-duty-cycle sampling at industrial temperatures without thermal derating, and the parallel interface drops directly onto FPGA DSP banks for waveform analysis.
推荐
Audio/Broadcast Equipment Signal Acquisition
The AD7899AR-3REEL works in professional audio and broadcast equipment for digitizing line-level +4 dBu balanced signals after external scaling, with ±10 V input range offering ample headroom for transient peaks of 12 dBu to 18 dBu. Its 14-bit resolution and 400 kSPS rate are appropriate for audio-bandwidth sampling (44.1 kSPS PCM-data paths with oversampling), and the SOIC-28 wide footprint is mechanically robust for broadcast rack chassis. The single +5 V supply side-steps the need for ±15 V analog rails inside audio gear. Designers typically pair it with an external op-amp LPF for alias rejection above the Nyquist edge.
推荐
推荐产品汇总
工程参考数据： AD7899AR-3REEL ——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 | AD7899ARZ-3REEL | AD7899AR-3 | AD7899ARZ-3 | AD7899AR-1REEL | AD7899AR-2REEL |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-pin SOIC (Wide) | 28-pin SOIC (Wide) - same | 28-pin SOIC (Wide) - same | 28-pin SOIC (Wide) - same | 28-pin SOIC (Wide) - same | 28-pin SOIC (Wide) - same |
| Resolution | 14-bit | 14-bit | 14-bit | 14-bit | 14-bit | 14-bit |
| Sample Rate | 400 kSPS | 400 kSPS | 400 kSPS | 400 kSPS | 400 kSPS | 400 kSPS |
| Input Voltage Range | ±10 V | ±10 V | ±10 V | ±10 V | 0 V to +5 V | ±5 V |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
| Lead Finish / RoHS | Leaded (legacy), RoHS varies | Lead-free (Pb-free), RoHS-compliant | Leaded (legacy), RoHS varies | Lead-free (Pb-free), RoHS-compliant | Leaded (legacy), RoHS varies | Leaded (legacy), RoHS varies |
关键差异点
- True ±10 V bipolar input range on a single +5 V supply （对比 AD7899AR-1REEL)
- Factory-authorized RoHS drop-in alternative available （对比 AD7899ARZ-3REEL)
- Internal 2.5 V reference included （对比 External reference AD780)
设计说明
Estimated: place AGND/DGND nets with a single-star connection under the part rather than a flooded plane; the wide-body SOIC has dedicated pins 25 (AGND) and 1 or 28 (DGND) which are not internally bonded, so good layout hygiene prevents ground-noise coupling into the analog input. Decouple AVDD and DVDD independently with a 10 µF tantalum + 100 nF ceramic each; share only at the supply connector. Estimated based on pin count and standard SAR ADC layout guidance.
Estimated: at 400 kSPS continuous conversion with +5 V supply, the AD7899 draws approximately 50-60 mW total. Ensure that the +5 V rail stays inside ±5% tolerance (4.75 V to 5.25 V) - operation below 4.75 V degrades linearity on the 14-bit output. Use an ADR01 or ADR02 5 V/10 V reference as a separate, low-noise source if the host 5 V is shared with switching logic; the internal 2.5 V reference is not designed to hold ADC linearity under noisy supply glitches.
The ~4 kohm input impedance of the AD7899AR-3's ±10 V input divider forms an RC with the source impedance; for source impedances above ~1 kohm, add an op-amp buffer (e.g., AD8021 or AD8628) directly in front of AIN+ to preserve ADC dynamics. Estimated: input capacitance is approximately 5 pF per ADI input-stage notes; with 4 kohm this gives a -3 dB corner near 8 MHz, well above Nyquist, but lower-frequency settling at the LSB level still demands attention for the kΩ-class transducer source case.
合规信息
The -REEL suffix in the AD7899 family historically indicated lead-finish and reel packaging; specific RoHS/REACH statements for the AR (legacy) variant are not in the provided data. The lead-free (-Z) variant AD7899ARZ-3REEL is the factory-authorized RoHS drop-in alternative. AEC-Q100 qualification not stated in provided data for this part number.