AD7892AR-1 - 12-Bit 500kSPS Bipolar SAR ADC | Analog Devices
MPN: AD7892AR-1 ✗ Cuối đờiAD7892AR-1 Tóm tắt
An ADC (analog-to-digital converter) is a data-converter integrated circuit that translates a continuous analog input voltage into a discrete digital code. Within the converter taxonomy, SAR (Successive Approximation Register) ADCs sit between high-speed flash ADCs and high-resolution delta-sigma ADCs, offering an attractive balance of speed (100 kSPS to multi-MSPS), resolution (12-18 bits), and low power. SAR converters are widely used in industrial control loops, motor-control current sensing, multichannel data-acquisition systems (DAS), and instrumentation where deterministic latency and excellent DC accuracy are required.
Key headline specifications include 12-bit resolution, 500 kSPS throughput (1.47 µs conversion time using the internal clock), a single +5 V supply with bipolar ±10 V input range (selected via the R1 input), ±5 V or 0 V to +5 V alternative input options on other AD7892 grades, 60 dB typical SNR at 50 kHz input, low power dissipation of around 60 mW, and a parallel or serial digital interface. The bipolar input capability eliminates the need for external level-shift or negative-rail signal conditioning in many 4-20 mA, ±5 V sensor, and motor-current applications.
The AD7892AR-1 uses an LC²MOS process with an on-chip buried-zener reference trimmed to ±10 mV initial accuracy, ensuring 12-bit performance without external reference components. The integrated track/hold amplifier handles input signals up to several hundred kHz, and the successive-approximation conversion delivers zero-pipeline latency, which simplifies closed-loop and oversampling applications.
Typical applications for the AD7892AR-1 include industrial process control (4-20 mA loop digitization), AC motor-control current and voltage sensing, instrumentation and data-acquisition systems, battery-cell monitoring, and CCD image processing. The combination of bipolar input and single +5 V supply simplifies analog front-end designs.
When designing with the AD7892AR-1, pay close attention to the input-protection network - a small series resistor and clamping diodes limit fault currents during over-voltage transients, as recommended in the AD7892 datasheet. Buffer the signal source with a low-impedance driver to preserve AC performance at high input frequencies.
This page synthesizes distributor pricing, drop-in package-compatible alternatives, and design notes for the AD7892AR-1 that go beyond the manufacturer datasheet, including cross-brand Bipolar SAR ADC equivalents and same-grade ADI AD7892 family pin-compatibles.
Bộ thay thế dễ dàng lắp đặt cho AD7892AR-1 — 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 AD7892AR-1 (cùng hình factor và footprint) — khác nhau ở Package, Conversion Time, Operating Temperature, RoHS Status, Architecture.
AD7892ARZ-1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7892BRZ-1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7892AR-1REEL
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →AD7892ARZ-1REEL
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
AD7892AR-1 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bits |
| Number of Inputs | 2 (selected via R1) |
| Throughput Rate | 500 kSPS (AD7892-1 grade) |
| Conversion Time | 1.47 us (successive approximation) |
| Input Range (R1 selection) | Bipolar ±10 V |
| Điện áp cung cấp | +5 V single supply |
| Điện áp cung cấp | ~60 mW power dissipation typical |
| On-Chip Reference | +2.5 V internal (LC2MOS buried-zener) |
| On-Chip Track/Hold | Yes |
| Giao diện | Parallel and Serial (selectable) |
| Architecture | SAR (Successive Approximation) |
| SNR | 70 dB (typical 50 kHz input) |
| INL | ±1 LSB (max) |
| Nhiệt độ hoạt động | -40C to +85C |
| Hộp | 24-SOIC (SO-24 W) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Non-RoHS (legacy, see AD7892ARZ-1 for Pb-free) |
| Lead Finish | SnPb (legacy AD7892AR-1); AD7892ARZ-1 is Pb-free |
Cấu hình chân AD7892AR-1
| Chân 1 | VSS — Negative supply (negative ground / 0V for single supply) |
| Chân 2 | AGND — Analog ground |
| Chân 3 | REF OUT — Internal 2.5 V reference output |
| Chân 4 | REF IN — Reference input (decoupled, bypass to AGND) |
| Chân 5 | VIN — Analog input (bipolar ±10 V on AD7892-1) |
| Chân 6 | R1 — Input range select (logic level) |
| Chân 7 | CLK — External clock input (if ECLK used) |
| Chân 8 | CONVST — Conversion start input |
| Chân 9 | BUSY — Output - conversion in progress (active high) |
| Chân 10 | EOC — End of conversion output |
| Chân 11 | DB11 — Data bit 11 (MSB when parallel) |
| Chân 12 | DB10 — Data bit 10 |
| Chân 13 | DB9 — Data bit 9 |
| Chân 14 | DB8 — Data bit 8 |
| Chân 15 | DB7 — Data bit 7 |
| Chân 16 | DB6 — Data bit 6 |
| Chân 17 | DB5 — Data bit 5 |
| Chân 18 | DB4 — Data bit 4 |
| Chân 19 | DB3 — Data bit 3 |
| Chân 20 | DB2 — Data bit 2 |
| Chân 21 | DB1 — Data bit 1 |
| Chân 22 | DB0 — Data bit 0 (LSB) |
| Chân 23 | VDD — +5 V supply |
| Chân 24 | DGND — Digital ground |
Ứng dụng tiêu biểu
AD7892AR-1 phù hợp cho 6 Áp dụngs: Industrial Process Control and 4-20 mA Loop Digitization, AC Motor Control Current and Voltage Sensing, Multichannel Data Acquisition Systems (DAS), Battery Cell Voltage Monitoring, Instrumentation and Test Equipment, CCD Image Processing and Imaging Front End.
Industrial Process Control and 4-20 mA Loop Digitization
The AD7892AR-1 is well matched to industrial 4-20 mA current-loop digitization because its ±10 V bipolar input range directly accommodates a 250 Ω sense resistor that converts 4-20 mA to 1-5 V without a negative supply rail. At 500 kSPS throughput, the ADC oversamples a single loop by a huge margin and can multiplex 8 to 16 loops with no throughput concern, while 12-bit resolution (1 LSB = 2.5 mV at ±10 V) easily resolves the 0.1 % loop accuracy needed by process-control transmitters. The bipolar input additionally accepts ±10 V signals from pressure, level, and flow transducers. Designers should add a low-pass RC filter between the sense resistor and the AD7892AR-1 input to reject RF interference in plant environments.
Được đề xuất
AC Motor Control Current and Voltage Sensing
In AC motor-control systems the AD7892AR-1's ±10 V bipolar input range and 1.47 µs conversion time capture phase-current and DC-bus voltage waveforms with zero-pipeline latency, which is critical for digital current-mode control loops. With a 500 kSPS throughput, the converter samples PWM-modulated current and voltage at the controller's interrupt rate (typically 10-20 kHz) with substantial oversampling headroom for digital filtering. Internal 1.47 µs SAR conversion keeps the feedback delay well under one PWM period at 20 kHz switching. Place a small isolation amplifier such as AD202 upstream for the HV side and use the AD7892AR-1 on the low-voltage secondary to digitize after the current shunt.
Được đề xuất
Multichannel Data Acquisition Systems (DAS)
The AD7892AR-1 delivers 500 kSPS and ±10 V bipolar inputs that drop directly into 24-SOIC multiplexer-front-end cards for general-purpose DAS boards. Multiplex 8 or 16 channels ahead of one AD7892AR-1 and still achieve 30 kSPS or more per channel for vibration, pressure, or temperature data logging. Internal +2.5 V reference saves board space, and the on-chip track/hold handles input bandwidths up to several hundred kHz for accurate AC measurement. Engineer-side consideration: add a wideband op-amp buffer between the mux and ADC to keep settling time below 250 ns for the full-scale transient from one channel to another.
Được đề xuất
Battery Cell Voltage Monitoring
For multi-cell battery-stack monitoring (telecom backup, e-mobility, solar storage), the AD7892AR-1's ±10 V bipolar input aligns with typical 12 V lead-acid or multi-cell Li-ion stack voltages when buffered through a precision divider network. A 500 kSPS throughput lets a single ADC scan a 12-cell stack in under 100 µs, easily within the 100 ms battery-management response budget. The on-chip +2.5 V reference simplifies tight-accuracy designs; alternatively an external reference can be used if temperature drift below 10 ppm/°C is required. The 24-SOIC footprint gives plenty of ground pins for the analog/digital separation required in multi-cell battery systems.
Được đề xuất
Instrumentation and Test Equipment
Bench-top DMMs, oscilloscope digitizers, and signal analyzers use the AD7892AR-1 for its 12-bit linear input range (±10 V) and ability to digitize signals up to the Nyquist bandwidth (250 kHz at 500 kSPS). With 1 LSB INL of ±1 the converter delivers over 70 dB SNR for clean-tones, sufficient for general-purpose instruments. Parallel or serial interface lets the instrument use the AD7892AR-1 in compact handhelds (serial) or full-speed lab gear (parallel). Add an input-protection network (100 Ω + clamping diodes) at the front end so the ADC survives accidental over-voltage during testing.
Được đề xuất
CCD Image Processing and Imaging Front End
The AD7892AR-1 is well suited to digitizing the analog output of CCD line sensors in industrial imaging applications because its 500 kSPS throughput matches typical CCD line rates (1 kHz to 100 kHz pixel clock), and its ±10 V bipolar input range matches typical CCD signal swings after a transimpedance amplifier. The internal track/hold handles the pixel-by-pixel reset-and-readout transitions cleanly, and the 12-bit dynamic range provides fine shading and gain control across the CCD's response curve. Use the parallel interface to clock pixel data into a frame buffer or FPGA, and synchronize the AD7892AR-1's CONVST input to the CCD's line-sync signal.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7892AR-1 — 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 | AD7892ARZ-1 | AD7892BRZ-1 | AD7892ANZ-1 | AD7892AR-1REEL | AD7892ARZ-1REEL |
|---|---|---|---|---|---|---|
| Package | 24-SOIC | 24-SOIC (same) | 24-SOIC (same) | 24-PDIP (different) | 24-SOIC (same) | 24-SOIC (same) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Throughput Rate | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS |
| Input Range | Bipolar ±10 V | Bipolar ±10 V | Bipolar ±10 V | Bipolar ±10 V | Bipolar ±10 V | Bipolar ±10 V |
| Lead Finish / RoHS | SnPb (non-RoHS) | Pb-free (RoHS) | Pb-free (RoHS) | Pb-free (RoHS) | SnPb (non-RoHS) | Pb-free (RoHS) |
| Packaging Form | Tube | Tube | Tube | Tube | Tape & Reel | Tape & Reel |
| Internal Reference | +2.5 V on-chip | +2.5 V on-chip | +2.5 V on-chip | +2.5 V on-chip | +2.5 V on-chip | +2.5 V on-chip |
| Price (qty 100, USD) | 15.40 | 14.95 | 16.20 | 16.80 | 15.95 | 15.20 |
Bảo phân biệt quan trọng
- Single +5 V supply with bipolar ±10 V input eliminates negative rail (vsGeneric bipolar ADC designs requiring -5 V (down))
- Pb-free RoHS-compliant drop-in available (vsAD7892ARZ-1)
- Internal +2.5 V reference and on-chip track/hold (vsAD7862 (unipolar 5 V input only))
Ghi chú thiết kế
Estimated: at 5 V single supply the AD7892AR-1 dissipates ~60 mW (12 mA idle plus conversion transient). Provide a 10 uF tantalum + 0.1 uF ceramic decoupling pair at the VDD pin (24) and a separate 1 uF + 0.1 uF at VSS (pin 1). Route the analog and digital ground returns to a single star point beneath the AD7892AR-1's exposed pad area, separating AGND and DGND only at the chip pinouts - bypass them with ferrite-bead LC networks if the converter is colocated with digital switching noise.
Place a 10 ohm series resistor at the ADC input pin (pin 5) followed by a 1 nF NPO ceramic cap to AGND to form a 16 MHz anti-alias filter and dampen the buffer-amp feedback transients during channel multiplexing. The internal track/hold acquires in less than 250 ns; ensure the upstream buffer op-amp settles to ±1 LSB within that window. If measuring bipolar ±10 V inputs, use a low-input-bias op-amp such as AD8628 or AD8629.
Do not drive the CONVST (pin 8) and CLK (pin 7) signals with long cables or noisy FPGA outputs - a clean monostable pulse of 20 ns minimum width is sufficient. Drive BUSY (pin 9) into an FPGA asynchronous input to avoid missing the end-of-conversion edge. When using the internal reference, decouple the REF OUT (pin 3) with a 10 uF + 0.1 uF cap pair to AGND, and avoid loading it with anything less than 1 Mohm impedance - otherwise reference drift and gain errors grow linearly with the load current.
Estimated: the 24-SOIC AD7892AR-1 should be soldered onto a 4-layer PCB with a continuous ground plane on layer 2 directly under the part. Keep analog input traces on the top side only, minimizing trace length below 5 mm, and route parallel digital buses (DB0-DB11) and CONVST/BUSY signals on the opposite layer to avoid capacitive feedthrough. Do not cross analog traces under digital busses. Use guard rings tied to AGND around the VIN pin to limit leakage from PCB contaminants.
Thông tin tuân thủ
AD7892AR-1 (SnPb lead finish) is non-RoHS; the AD7892ARZ-1 variant is Pb-free RoHS-compliant and recommended for new designs. AEC-Q100 not applicable to industrial-grade SAR ADC.
