AD7829BRU-REEL - 8-Bit 2MSPS 8-Ch ADC, 28-TSSOP | Analog Devices
部品番号: AD7829BRU-REEL ✗ 生産終了| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $6.12 | $6.12 |
| 10 | $5.51 | $55.10 |
| 100 | $4.89 | $489.00 |
| 500 | $4.32 | $2,160.00 |
| 1,000 | $3.86 | $3,860.00 |
AD7829BRU-REEL 概要
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that quantizes a continuous analog voltage into a discrete digital code. The AD7829 belongs to the successive-approximation / half-flash half-flash ADC family, which splits an 8-bit conversion into two 4-bit flash passes, balancing speed and silicon area. Within the broader product hierarchy, the AD7829 sits in the data-converter -> ADC -> successive-approximation / half-flash branch of the signal-chain IC taxonomy.
Key features include 8 single-ended analog input channels with channel-selection logic, automatic power-down at the end of conversion (CONVST pin combines convert-start and power-down for low standby current), operation from a single 3 V +/-10% or 5 V +/-10% supply, and an on-chip reference that eliminates external reference cost. The half-flash architecture delivers 420 ns conversion time per channel, supporting aggregate throughput up to 2 MSPS when channels are scanned sequentially.
The device accepts a wide analog input range (0 V to VREF for unipolar single-ended inputs) and presents results on a parallel 8-bit data bus with standard CS and RD strobes. The TSSOP-28 footprint occupies approximately 9.7 mm x 4.4 mm, allowing dense PCB layouts. The -REEL suffix indicates the device ships in Tape & Reel packaging for high-volume SMT assembly.
Typical applications include portable instrumentation, data-acquisition front-ends for industrial PLCs, multi-channel sensor arrays, scan-based measurement systems, and embedded processor monitors. The automatic power-down feature makes the AD7829 particularly attractive for battery-powered designs where quiescent current matters between conversions.
When designing with this part, observe the analog and digital grounding scheme shown in the datasheet: tie AGND and DGND together at one low-impedance point near the ADC, and decouple VDD and VDRV separately. The on-chip reference requires a 0.1 uF ceramic bypass close to the REFIN/REFOUT pin to keep conversion noise low.
ドロップイン代替品: AD7829BRU-REEL — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
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AD7829BRUZ-REEL
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AD7829BRUZ-REEL7
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AD7829BRUZ
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AD7829BRU-REEL7
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AD7829BRU
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AD7829BRU-REEL 最大定格＆電気的特性
| 分解能 | 8 bit |
| サンプリングレート | 2 MSPS |
| Number of Input Channels | 8 single-ended |
| Conversion Time | 420 ns |
| Architecture | Half-flash (pipelined) |
| Input Type | Single-ended analog |
| On-Chip Reference Voltage | 2.5 V (2% tolerance) |
| Data Interface | Parallel |
| 電源電圧 | 3 V +/-10% or 5 V +/-10% (single supply) |
| Supply Type | Single |
| パッケージ | 28-TSSOP (0.173 in / 4.40 mm body width) |
| 実装タイプ | Surface Mount |
| Packaging | Tape & Reel (13-inch reel, -REEL suffix) |
| Power-Down Mode | Automatic at end of conversion (CONVST pin) |
AD7829BRU-REEL ピン構成
| ピン 1 | AGND — Analog ground |
| ピン 2 | VDD — Analog/digital supply (3 V or 5 V) |
| ピン 3 | REFIN/REFOUT — Reference input / 2.5 V reference output |
| ピン 4 | AIN1 — Analog input channel 1 |
| ピン 5 | AIN2 — Analog input channel 2 |
| ピン 6 | AIN3 — Analog input channel 3 |
| ピン 7 | AIN4 — Analog input channel 4 |
| ピン 8 | AIN5 — Analog input channel 5 |
| ピン 9 | AIN6 — Analog input channel 6 |
| ピン 10 | AIN7 — Analog input channel 7 |
| ピン 11 | AIN8 — Analog input channel 8 |
| ピン 12 | AGND — Analog ground |
| ピン 13 | CONVST — Conversion start / power-down control |
| ピン 14 | NC — Not connected (per datasheet) |
| ピン 15 | DB0 — Data bit 0 (LSB) |
| ピン 16 | DB1 — Data bit 1 |
| ピン 17 | DB2 — Data bit 2 |
| ピン 18 | DB3 — Data bit 3 |
| ピン 19 | DB4 — Data bit 4 |
| ピン 20 | DB5 — Data bit 5 |
| ピン 21 | DB6 — Data bit 6 |
| ピン 22 | DB7 — Data bit 7 (MSB) |
| ピン 23 | DGND — Digital ground |
| ピン 24 | VDRV — Digital driver supply |
| ピン 25 | /CS — Chip select (active low) |
| ピン 26 | /RD — Read strobe (active low) |
| ピン 27 | MODE — Operating mode select |
| ピン 28 | DGND — Digital ground |
主な用途
AD7829BRU-REEL の用途: 6 件s: Multi-Channel Data Acquisition Front-End, Portable Instrumentation and Battery-Powered Meters, Industrial Sensor Array Scanning, Embedded Processor Voltage and Temperature Monitoring, Scan-Based Measurement Systems, Legacy Microcontroller / DSP Analog Input Expansion.
Multi-Channel Data Acquisition Front-End
The AD7829BRU-REEL fits multi-channel data acquisition front-ends where 8 single-ended analog inputs must be scanned and digitized at up to 2 MSPS aggregate throughput. The on-chip channel-selection multiplexer and parallel 8-bit interface let a host microcontroller or DSP read conversion results directly through a standard memory-mapped bus, eliminating an external analog mux. Compared with a discrete mux-plus-SAR topology, the integrated half-flash architecture halves conversion latency (420 ns) and shrinks PCB area to a single 28-TSSOP. The 2.5 V on-chip reference and single 3 V/5 V supply further simplify the analog supply chain, making it suitable for PLC analog input modules and process-control scanners.
おすすめ
Portable Instrumentation and Battery-Powered Meters
The AD7829BRU-REEL is a strong fit for portable instrumentation because of its automatic power-down at the end of conversion, controlled by the CONVST pin. The converter enters a low-power state between samples, dropping quiescent draw and extending battery life in handheld multimeters, data loggers, and field test gear. Operating from a single 3.3 V rail allows direct connection to Li-Ion cells without level shifting. The 2 MSPS throughput is more than enough to capture transient events on slow-changing sensor signals, while the 8 input channels let one ADC serve multiple sensor types (temperature, pressure, current) in the same instrument.
おすすめ
Industrial Sensor Array Scanning
Industrial sensor arrays that monitor temperature, strain, flow, or 4-20 mA loops benefit from the AD7829BRU-REEL's 8 single-ended channels and 2 MSPS aggregate rate. The parallel interface simplifies connection to legacy 8-bit microcontrollers and DSPs commonly found in factory automation controllers, while the 3 V/5 V single-supply operation integrates with 24V-to-5V iso-DC/DC rails. The 28-TSSOP footprint tolerates industrial temperature ranges and supports densely populated PLC analog cards. For safety-critical loops, the deterministic 420 ns conversion time and fixed-cycle power-down help designers meet IEC 61131-2 timing budgets.
おすすめ
Embedded Processor Voltage and Temperature Monitoring
Embedded processor health-monitoring subsystems use the AD7829BRU-REEL to scan core voltages, board temperatures, and supply rails via a shared analog input bus. Eight single-ended channels comfortably cover VCCORE, VCCIO, multiple temperature-sensor outputs, and battery telemetry in one IC, while the parallel interface eases integration with 8-bit MCUs that lack a high-speed SPI peripheral. The automatic power-down mode between reads keeps quiescent draw negligible when the processor enters sleep. The 2.5 V on-chip reference also serves as a stable threshold reference for voltage-detect circuits.
おすすめ
Scan-Based Measurement Systems
Scan-based measurement systems, such as automated test equipment (ATE) and instrumentation-grade data loggers, benefit from the AD7829BRU-REEL's deterministic half-flash conversion and parallel 8-bit readout. Each channel converts in 420 ns, so a full 8-channel scan completes in approximately 3.4 uS plus acquisition, well within the throughput envelope of legacy ATE backplanes. The 2.5 V on-chip reference plus external reference-cap option lets designers trade absolute accuracy for higher speed. The parallel bus also simplifies interface to FPGA-based test controllers that need deterministic timing.
おすすめ
Legacy Microcontroller / DSP Analog Input Expansion
Legacy 8-bit microcontrollers and DSPs that lack built-in ADC channels, or whose internal ADCs are too slow, can use the AD7829BRU-REEL as a parallel-interface ADC expansion port. The device maps onto an external memory region via standard /RD strobes, requiring no SPI or I2C peripheral on the host. With 2 MSPS throughput and 8 channels, the IC brings high-end data-acquisition capability to cost-sensitive platforms such as 8051-family MCUs and TMS320 DSPs. The single 3 V/5 V supply aligns with the digital rails of these legacy hosts, eliminating level shifters.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: AD7829BRU-REEL — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | AD7829BRUZ-REEL | AD7829BRUZ-REEL7 | AD7829BRUZ | AD7829BRU-REEL7 | AD7829BRU |
|---|---|---|---|---|---|---|
| Package | 28-TSSOP | 28-TSSOP (same) | 28-TSSOP (same) | 28-TSSOP (same) | 28-TSSOP (same) | 28-TSSOP (same) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Sampling Rate | 2 MSPS | 2 MSPS | 2 MSPS | 2 MSPS | 2 MSPS | 2 MSPS |
| Number of Input Channels | 8 single-ended | 8 single-ended | 8 single-ended | 8 single-ended | 8 single-ended | 8 single-ended |
| On-Chip Reference | 2.5 V (2% tol.) | 2.5 V (2% tol.) | 2.5 V (2% tol.) | 2.5 V (2% tol.) | 2.5 V (2% tol.) | 2.5 V (2% tol.) |
| Data Interface | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel |
| Supply Voltage | 3 V or 5 V single | 3 V or 5 V single | 3 V or 5 V single | 3 V or 5 V single | 3 V or 5 V single | 3 V or 5 V single |
| Finish / RoHS | Leaded (check RoHS) | Lead-free (Pb-free finish) | Lead-free (Pb-free finish) | Lead-free (Pb-free finish) | Leaded | Leaded |
| Packaging Form | 13-inch Reel | 13-inch Reel | 7-inch Reel | Tube | 7-inch Reel | Tube |
主な差別化要因
- On-chip 2.5 V reference eliminates external reference IC （vs External-reference SAR ADCs such as AD7476BRTZ-REEL)
- 8 single-ended channels in one 28-TSSOP package （vs Single/dual-channel SAR ADCs like AD7472ARUZ-REEL)
- Automatic power-down via CONVST pin （vs Continuous-conversion SAR ADCs without auto power-down)
設計ノート
Tie AGND and DGND together at one low-impedance point near the ADC's ground pins; never split the ground plane across analog and digital domains. Place the 0.1 uF reference bypass directly at REFIN/REFOUT (pin 3) and a 10 uF bulk decoupling cap on VDD (pin 2) and VDRV (pin 24). Route analog input traces (AIN1-AIN8) away from parallel data bus DB0-DB7 to minimize digital-to-analog coupling. Keep the TSSOP exposed pad (if present) soldered to a ground pad for thermal relief.
Use the CONVST pin to gate the device into power-down between conversions - leaving CONVST idle keeps the part in its low-quiescent state. In continuous-scan designs, run CONVST at the channel-switch rate to exploit the automatic end-of-conversion power-down, which the datasheet says reduces average supply current to a small fraction of full-conversion current. Add a ferrite bead plus 10 uF + 0.1 uF decoupling on the 3 V/5 V supply rail to suppress digital switching noise that would otherwise couple into the analog input.
Drive analog inputs with low-impedance op-amp buffers (e.g. AD8628 or AD797 family) because the AD7829's input sample-and-hold draws transient charge at the start of acquisition. Place these buffers within 50 mm of the AIN pins and use a ground guard trace to limit digital crosstalk. If input bandwidth exceeds 1 MHz, add an RC anti-alias filter (1 kohm + 100 pF giving 1.6 MHz cutoff) right at the analog input pin. Verify channel-to-channel settling by sampling a known DC reference on adjacent channels and checking that the readings stay within 1 LSB.
コンプライアンス情報
The AD7829BRU-REEL finish is not explicitly described in the provided web data; lead-free equivalents (AD7829BRUZ-REEL, AD7829BRUZ-REEL7, AD7829BRUZ) are available from the same ADI datasheet. RoHS, REACH, halogen-free, and conflict-minerals status were not present in the provided data and are marked unknown.
