AD7827BRZ-REEL7 - 8-Bit 1MSPS Serial ADC | Analog Devices
MPN: AD7827BRZ-REEL7 ✓ Hoạt độngAD7827BRZ-REEL7 Tóm tắt
An ADC (analog-to-digital converter) is a data-conversion IC that samples continuous analog voltages and outputs discrete digital codes. The AD7827 is a successive-approximation-style half-flash ADC, sitting in the hierarchy: half-flash ADC -> successive-approximation ADC -> analog-to-digital converter -> data converter -> signal-chain IC -> semiconductor. Its on-chip reference and serial output minimize external component count, making it suitable for compact, mixed-signal designs.
Key features include a maximum throughput of 1 MSPS, a 420 ns conversion time, a 200 ns acquisition time, a serial interface compatible with most DSPs and microcontrollers, and a hardware power-down mode controlled via the CONVST pin. The half-flash architecture provides two flash blocks clocked on opposite phases, halving the comparator count and power consumption compared with a full-flash ADC of equivalent speed.
Typical applications include high-speed data acquisition front-ends, DSP-based instrumentation, automatic test equipment (ATE) digitizers, and process-control I/O modules. The wide supply range (3 V or 5 V) and serial interface also suit it for battery-powered portable measurement devices where PCB area and quiescent current are constrained.
When designing with the AD7827BRZ-REEL7, pay close attention to analog input bandwidth and source-impedance settling. A small external RC at AIN usually improves performance, and the on-chip 2.5 V reference must be bypassed with at least 1 nF to keep noise low. The CONVST pin doubles as the power-down strobe; an idle pulse width longer than the power-down timeout must be avoided to keep the part in the active state.
This page consolidates current distributor pricing, pin-for-pin compatible alternatives, and practical PCB design notes that supplement the Analog Devices AD7827 datasheet, giving procurement and design teams a single reference for evaluation, drop-in replacement sourcing, and board bring-up.
Bộ thay thế dễ dàng lắp đặt cho AD7827BRZ-REEL7 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với AD7827BRZ-REEL7 (cùng hình factor và footprint) — khác nhau ở Packaging, Architecture, Data Interface, Package, Resolution.
AD7827BRZ-REEL
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD7827BRZ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD7478AAKSZ-REEL7
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ADS7886SDCKR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS7886SDBVR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7827BRZ-REEL7 Tỷ lệ tối đa & tính chất điện
| Number of Bits | 8 |
| Tỷ lệ lấy mẫu | 1 MSPS |
| Input Channels | 1 |
| Architecture | Half-Flash ADC |
| Conversion Time | 420 ns |
| Acquisition Time | 200 ns |
| On-Chip Reference | 2.5 V (2% tolerance) |
| Data Interface | DSP-compatible Serial |
| Điện áp cung cấp | 3 V or 5 V single supply |
| Track-and-Hold | On-chip |
| Shutdown Mode | Yes, via CONVST pin |
| Hộp / Vỏ | 8-SOIC (0.154", 3.90 mm width) |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tape & Reel (REEL7) |
| Nhiệt độ hoạt động | Commercial range |
Cấu hình chân AD7827BRZ-REEL7
| Chân 1 | VDD — Analog/digital supply, 3 V or 5 V |
| Chân 2 | GND — Digital ground |
| Chân 3 | CONVST — Convert Start / Power-Down (active high starts conversion) |
| Chân 4 | DOUT — Serial data output, MSB-first |
| Chân 5 | AGND — Analog ground |
| Chân 6 | AIN — Analog input |
| Chân 7 | REF — On-chip 2.5 V reference output |
| Chân 8 | REF GND — Reference ground return |
Ứng dụng tiêu biểu
AD7827BRZ-REEL7 phù hợp cho 6 Áp dụngs: High-Speed Data Acquisition Front End, DSP-Based Audio Metering, Automatic Test Equipment (ATE) Digitizers, Industrial Process Control I/O Modules, Portable Measurement Instruments, Automotive Sensor Readout (non-safety).
High-Speed Data Acquisition Front End
The AD7827BRZ-REEL7 brings 1 MSPS sampling and 8-bit resolution to a small 8-SOIC footprint, making it well-suited as the analog front end of a multi-channel data-acquisition board. Its 200 ns acquisition time and 420 ns conversion time allow a host microcontroller or DSP to read the serial output and still have margin for housekeeping. Designers can scale this to 8 or 16 channels by multiplexing multiple AD7827s on one SPI bus.
Được đề xuất
DSP-Based Audio Metering
The AD7827BRZ-REEL7's serial interface is natively compatible with most digital-signal processors, and its 1 MSPS throughput is comfortably above the 48 kHz audio Nyquist - making the part a good fit for VU/peak metering or audio level-detection front ends. With the on-chip 2.5 V reference, the converter delivers a stable full-scale reading suitable for RMS and peak calculations. The low quiescent current also makes it attractive for portable audio test instruments.
Được đề xuất
Automatic Test Equipment (ATE) Digitizers
Test-equipment digitizer cards require a sub-microsecond ADC with solid noise performance, and the AD7827BRZ-REEL7 fits with its 420 ns conversion and integrated track-and-hold. The CONVST pin that doubles as Power-Down lets a multiplexer controller shut the converter down between samples, lowering system heat in dense ATE racks. The 8-bit resolution is enough for go/no-go tests and basic waveform digitization of slow nodes.
Được đề xuất
Industrial Process Control I/O Modules
PLC and industrial I/O modules need a low-power, 3 V/5 V-tolerant ADC that pairs with a host MCU and a serial bus - exactly the AD7827BRZ-REEL7's envelope. The on-chip reference simplifies bill-of-materials for 4-20 mA current-loop monitors and 0-10 V transducer digitizers. Designers can rely on the SOIC-8 footprint for rugged, surface-mount PCBs that survive -40 °C to +85 °C operating environments.
Được đề xuất
Portable Measurement Instruments
Handheld multimeters, oscilloscope probes, and field meters all benefit from the AD7827BRZ-REEL7's low-power shutdown mode and 3 V supply operation. The CONVST pin's dual role means the host MCU can power-down the converter between samples, extending battery runtime. The 8-SOIC footprint keeps the PCB small enough to drop inside a pen-style probe housing.
Được đề xuất
Automotive Sensor Readout (non-safety)
Although not AEC-Q100 qualified, the AD7827BRZ-REEL7's 3 V/5 V supply, SOIC-8 footprint, and 1 MSPS speed make it a candidate for non-safety automotive subsystems such as interior sensor digitizers, battery-management telemetry, or HVAC position feedback. Combined with an external filter and isolation, the converter adds 8-bit precision to infotainment and comfort modules. Designers targeting AEC-Q100 compliance should evaluate ADI's automotive-grade converters separately.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7827BRZ-REEL7 — 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 | AD7827BRZ-REEL | AD7827BRZ | ADS7886SDCKR |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC (SC70) |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit |
| Sampling Rate | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS |
| On-Chip Reference | 2.5 V, 2% | 2.5 V, 2% | 2.5 V, 2% | External required |
| Supply Voltage | 3 V or 5 V | 3 V or 5 V | 3 V or 5 V | 2.7 V to 5.5 V |
| Conversion Time | 420 ns | 420 ns | 420 ns | 390 ns |
| Interface | DSP-compatible Serial | DSP-compatible Serial | DSP-compatible Serial | SPI / Serial |
| Power-Down Mode | Yes (via CONVST) | Yes (via CONVST) | Yes (via CONVST) | Yes (via CS) |
Bảo phân biệt quan trọng
- On-chip 2.5 V reference with 2% tolerance eliminates external reference BOM (vsADS7886SDCKR)
- Single CONVST pin combines Convert-Start and Power-Down for tight DSP control (vsADS7886SDCKR)
- 8-SOIC industry-standard footprint reduces PCB layout risk (vsAD7478AAKSZ-REEL7)
Ghi chú thiết kế
Place a 1 nF (or larger) ceramic bypass capacitor as close as possible to the REF pin and another 100 nF decoupling cap near the VDD pin. Keep the analog AIN trace short and route it away from DOUT switching edges. A small ground plane tied to AGND and REF GND reduces digital coupling into the analog path. Estimated: a 50 mm trace in 1 oz copper introduces ~30 nH, so local bypass is essential for clean 1 MSPS conversion.
Drive the analog input through a low-impedance buffer with at least 10 MHz bandwidth so that the input settles within the 200 ns acquisition window. Add a 10-100 ohm series resistor with a 100 pF shunt on the AIN pin when the source impedance exceeds 1 kohm to damp ringing. The serial DOUT line should be kept short - 50 mm maximum at 1 MSPS - or series-terminated if routing is longer.
The CONVST pin doubles as Power-Down, so driving it continuously low places the part in power-down. After exiting power-down, the reference and internal amplifiers need ~1 microsecond to settle before the next valid conversion - hold the first CONVST edge at least 1 microsecond after wake-up. Do not overdrive the REF pin with an external reference higher than 2.5 V without consulting the manufacturer datasheet absolute-maximum table.
Thông tin tuân thủ
RoHS/REACH compliant per Analog Devices product page; not AEC-Q100 qualified - not recommended for automotive safety applications. Halogen-free per BRZ package suffix designation.