AD7829BRU-REEL - 8-Bit 2MSPS 8-Ch ADC, 28-TSSOP | Analog Devices
MPN: AD7829BRU-REEL ✗ Cuối đờiAD7829BRU-REEL Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho AD7829BRU-REEL — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
AD7829BRUZ-REEL
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7829BRUZ-REEL7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7829BRUZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7829BRU-REEL7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7829BRU
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7829BRU-REEL Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 8 bit |
| Tỷ lệ lấy mẫu | 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 |
| Điện áp cung cấp | 3 V +/-10% or 5 V +/-10% (single supply) |
| Supply Type | Single |
| Hộp | 28-TSSOP (0.173 in / 4.40 mm body width) |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tape & Reel (13-inch reel, -REEL suffix) |
| Power-Down Mode | Automatic at end of conversion (CONVST pin) |
Cấu hình chân AD7829BRU-REEL
| Chân 1 | AGND — Analog ground |
| Chân 2 | VDD — Analog/digital supply (3 V or 5 V) |
| Chân 3 | REFIN/REFOUT — Reference input / 2.5 V reference output |
| Chân 4 | AIN1 — Analog input channel 1 |
| Chân 5 | AIN2 — Analog input channel 2 |
| Chân 6 | AIN3 — Analog input channel 3 |
| Chân 7 | AIN4 — Analog input channel 4 |
| Chân 8 | AIN5 — Analog input channel 5 |
| Chân 9 | AIN6 — Analog input channel 6 |
| Chân 10 | AIN7 — Analog input channel 7 |
| Chân 11 | AIN8 — Analog input channel 8 |
| Chân 12 | AGND — Analog ground |
| Chân 13 | CONVST — Conversion start / power-down control |
| Chân 14 | NC — Not connected (per datasheet) |
| Chân 15 | DB0 — Data bit 0 (LSB) |
| Chân 16 | DB1 — Data bit 1 |
| Chân 17 | DB2 — Data bit 2 |
| Chân 18 | DB3 — Data bit 3 |
| Chân 19 | DB4 — Data bit 4 |
| Chân 20 | DB5 — Data bit 5 |
| Chân 21 | DB6 — Data bit 6 |
| Chân 22 | DB7 — Data bit 7 (MSB) |
| Chân 23 | DGND — Digital ground |
| Chân 24 | VDRV — Digital driver supply |
| Chân 25 | /CS — Chip select (active low) |
| Chân 26 | /RD — Read strobe (active low) |
| Chân 27 | MODE — Operating mode select |
| Chân 28 | DGND — Digital ground |
Ứng dụng tiêu biểu
AD7829BRU-REEL phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7829BRU-REEL — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- On-chip 2.5 V reference eliminates external reference IC (vsExternal-reference SAR ADCs such as AD7476BRTZ-REEL)
- 8 single-ended channels in one 28-TSSOP package (vsSingle/dual-channel SAR ADCs like AD7472ARUZ-REEL)
- Automatic power-down via CONVST pin (vsContinuous-conversion SAR ADCs without auto power-down)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
