AD7898ARZ-10REEL7 - 12-Bit 220kSPS Serial ADC SOIC-8 | ADI
MPN: AD7898ARZ-10REEL7 ✓ Hoạt độngAD7898ARZ-10REEL7 Tóm tắt
An SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that uses a binary-search algorithm and an internal DAC to convert an analog input to a digital code in N conversion cycles. SAR ADCs occupy a sweet spot in the converter hierarchy (ADC -> data converter -> signal chain IC -> mixed-signal semiconductor), offering an excellent balance of speed, resolution, and power consumption without the latency of delta-sigma or the complexity of pipelined architectures.
Key features of the AD7898 include a maximum 220 kSPS sampling rate over a 5 V single supply, an SINAD of 70 dB (11.5 effective bits), ±1 LSB typical integral nonlinearity, and a flexible three-wire serial interface that can operate with 3 V or 5 V logic via VDRIVE. The 8-pin SOIC footprint integrates the complete ADC function with minimal external components - just bypass capacitors and a reference decoupling cap.
Architecturally, the AD7898 uses a charge-redistribution SAR core with an input track-and-hold capable of handling full-scale input transients up to the converter's bandwidth. The on-chip clock eliminates external timing components. The 16-bit serial word output format includes four leading zeros followed by the 12-bit MSB-first result, simplifying DSP and MCU interface code.
Typical applications include industrial process control data acquisition, motor control feedback loops, portable instrumentation, power-line monitoring, and multi-channel multiplexed ADC systems where throughput, small package, and 5 V operation are critical. The -10 input range variant suits bipolar sensor signals and industrial ±10 V control rails.
When designing with the AD7898, observe input common-mode and signal conditioning requirements - the 10 V range variant expects ±10 V true bipolar signals and requires an input buffer with low output impedance for full accuracy. Decouple AVDD and VDRIVE separately, and respect the 5 V supply tolerance for noise-free conversions. The serial clock rate scales with throughput, so timing budget analysis at 220 kSPS is recommended.
This page synthesizes distributor pricing, drop-in SOIC-8 pin-compatible alternatives, and practical design considerations beyond what the manufacturer datasheet alone provides.
Bộ thay thế dễ dàng lắp đặt cho AD7898ARZ-10REEL7 — 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 AD7898ARZ-10REEL7 (cùng hình factor và footprint) — khác nhau ở Data Interface, Package, Packaging, Supply Voltage.
AD7898ARZ-10REEL
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7898ARZ-10
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7898AR-10REEL7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7898AR-10REEL
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7898AR-10
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7898BRUZ-10REEL7
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
AD7476BRTZ-REEL7
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
AD7898ARZ-10REEL7 Tỷ lệ tối đa & tính chất điện
| Number of Bits | 12 |
| Tỷ lệ lấy mẫu | 220 kSPS |
| Number of Inputs | 1 |
| Input Type | Single-Ended (Pseudo-Bipolar ±10 V for -10 variant) |
| Data Interface | Serial (3-wire SPI-compatible) |
| Architecture | SAR (Successive Approximation) |
| Điện áp cung cấp | 5 V single supply |
| VDRIVE Logic Interface | 2.7 V to 5.5 V (supports 3 V or 5 V MCU/DSP) |
| Hộp | 8-SOIC (0.154 inch / 3.90 mm width) |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tape & Reel (REEL7 = 7-inch reel) |
| Khoảng nhiệt độ hoạt động | -40 °C to +85 °C (industrial) |
| On-chip Features | Track-and-Hold amplifier, on-chip clock, VDRIVE supply pin |
| Integral Nonlinearity (INL) | ±1 LSB max (typical) |
| Trạng thái RoHS | Compliant |
Cấu hình chân AD7898ARZ-10REEL7
| Chân 1 | VDRIVE — Logic interface supply voltage (2.7 V to 5.5 V) for serial output levels |
| Chân 2 | AGND — Analog ground reference |
| Chân 3 | VIN — Analog input (single-ended, ±10 V range for -10 variant) |
| Chân 4 | AVDD — Analog supply voltage (+5 V) |
| Chân 5 | REF — Reference voltage input / decoupling pin |
| Chân 6 | CONVST — Conversion start input (logic falling edge initiates sampling) |
| Chân 7 | SCLK — Serial clock input for serial interface data readback |
| Chân 8 | SDATA — Serial data output (MSB first, 16-bit word) |
Ứng dụng tiêu biểu
AD7898ARZ-10REEL7 phù hợp cho 6 Áp dụngs: Industrial Process Control Data Acquisition, Motor Control Feedback Loops, Portable Instrumentation and Battery-Powered Test Equipment, Power-Line Monitoring and Energy Metering, Medical Patient Monitoring and Diagnostic Equipment, Multi-Channel Multiplexed Data Acquisition Systems.
Industrial Process Control Data Acquisition
The AD7898ARZ-10REEL7 is purpose-built for 4-20 mA loop transmitters and ±10 V industrial signal acquisition. Its ±10 V bipolar input range directly accepts signals from process sensors (pressure, flow, temperature transmitters) without external level shifters. The 220 kSPS throughput samples multi-channel multiplexed signals from PLC analog input modules at well above the typical 100 Hz loop bandwidth, with 70 dB SINAD delivering 11.5 effective bits for control-loop accuracy. The on-chip track-and-hold handles fast transient steps from switched sensor inputs, and the 5 V single-supply operation simplifies PLC backplane power design. Designers should pair the AD7898 with the AD8475 differential receiver for true 16-bit-class industrial signal chains.
Được đề xuất
Motor Control Feedback Loops
In brushless DC and AC servo motor drives, the AD7898ARZ-10REEL7 samples phase current and DC-bus feedback at 220 kSPS with single-cycle latency, supporting sub-100 microsecond current-loop update rates. Its single-ended ±10 V input range (the -10 variant) accepts current-sense amplifier outputs directly from AD8205/AD8210 family amplifiers without signal conditioning. The deterministic SAR conversion time is critical for field-oriented control (FOC) loops where pipeline delay is unacceptable. The serial interface with VDRIVE connects directly to 3.3 V motor-control DSPs like the ADSP-CM408. Drop-in alternative: the AD7265BCPZ-REEL provides simultaneous dual-channel sampling for three-phase systems when channel density matters.
Được đề xuất
Portable Instrumentation and Battery-Powered Test Equipment
The AD7898ARZ-10REEL7 fits handheld multimeters, oscilloscope front-ends, and field data loggers where 5 V single-supply operation and small 8-SOIC footprint matter. Its 220 kSPS throughput digitizes transient events like switch-mode power supply startup surges, while the 5 V operation extends battery life with proper duty-cycling. The serial interface reduces pin count on compact MCU hosts like the ADuCM3027 or STM32L4. Designers can power-cycle the ADC for ultra-low standby, using the EN pin to drop quiescent current between conversions. The 8-SOIC thermal performance is adequate for continuous 220 kSPS operation in enclosed handheld enclosures.
Được đề xuất
Power-Line Monitoring and Energy Metering
The AD7898ARZ-10REEL7 captures voltage and current waveforms in single-phase power-quality analyzers at 220 kSPS, providing sufficient sample rate for 50/60 Hz line frequency analysis up to the 50th harmonic. Its ±10 V input range handles direct voltage-divider-scaled mains signals, while the SAR architecture provides instant conversion - critical for cycle-by-cycle RMS calculations. Designers often pair it with the ADE7953 energy metering IC for combined power monitoring. The 5 V single supply aligns with auxiliary power rails from isolated AC-DC converters like the ADuM5000 family.
Được đề xuất
Medical Patient Monitoring and Diagnostic Equipment
The AD7898ARZ-10REEL7 is suitable for non-critical medical signal acquisition such as patient monitors, infusion pumps, and diagnostic spirometers where 12-bit resolution is adequate. Its bipolar ±10 V input range simplifies electrode and sensor signal conditioning without inversion stages. The SAR architecture provides deterministic latency required for cardiac event-triggered sampling. Designers should note that for ECG/EEG with higher resolution requirements, the AD7190 sigma-delta family is preferable. The 5 V operation aligns with IEC 60601-1 compatible medical power supplies using ADuM6000 isolators.
Được đề xuất
Multi-Channel Multiplexed Data Acquisition Systems
The AD7898ARZ-10REEL7 with external 8:1 or 16:1 analog multiplexers (ADG708/ADG726) builds cost-effective multi-channel DAQ systems at 220 kSPS aggregate throughput. For example, 8-channel systems achieve 27.5 kSPS per channel - more than adequate for thermocouple and strain-gauge multiplexing. The on-chip track-and-hold settles quickly after multiplexer channel switches, and the VDRIVE pin enables direct connection to 3.3 V FPGA-based DAQ controllers like the XA7A25T family. Designers should budget multiplexer settling time (typically 1-2 microseconds) into the per-channel sample budget.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7898ARZ-10REEL7 — 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 | AD7898ARZ-10REEL | AD7898ARZ-10 | AD7898AR-10REEL7 | AD7898AR-10REEL | AD7898AR-10 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Resolution | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit |
| Sampling Rate | 220 kSPS | 220 kSPS | 220 kSPS | 220 kSPS | 220 kSPS | 220 kSPS |
| Input Range | ±10 V | ±10 V | ±10 V | ±10 V | ±10 V | ±10 V |
| Supply Voltage | 5 V single | 5 V single | 5 V single | 5 V single | 5 V single | 5 V single |
| Lead Finish | Lead-free (matte-tin) | Lead-free | Lead-free | Tin-lead | Tin-lead | Tin-lead |
| Packaging Carrier | Tape & Reel (7-inch) | Tape & Reel (13-inch) | Tube | Tape & Reel (7-inch) | Tape & Reel | Tube |
| Approx. Unit Price (qty 1) | $16.50 | $15.80 | $17.20 | $18.40 | $17.80 | $19.10 |
Bảo phân biệt quan trọng
- Same-brand family coverage with packaging/finish variants only (vsAD7898ARZ-10REEL (tube))
- VDRIVE pin enables direct 3 V MCU interface (vsLegacy 5 V-only ADCs (e.g., AD574A))
- ±10 V true bipolar input on 5 V single supply (vs0-5 V input range ADCs (e.g., AD7476 in single-supply mode))
Ghi chú thiết kế
Decouple AVDD with a 10 µF tantalum or low-ESR ceramic capacitor in parallel with a 0.1 µF ceramic placed within 5 mm of the supply pin. VDRIVE should be separately decoupled with 0.1 µF to its own quiet ground reference. Do not share AVDD and VDRIVE decoupling capacitors - digital switching noise on VDRIVE can couple into analog AVDD through the shared ground via, degrading SINAD. Estimated: at 220 kSPS with SCLK at 5 MHz, expected AVDD current draw is ~8 mA peak.
Layout the 8-SOIC with the analog ground plane directly under the part and a star-ground connection at AGND pin 2. Route VIN, REF, and AGND on the top layer with continuous ground return paths - avoid vias in signal traces. The serial interface traces (CONVST, SCLK, SDATA) should be kept short (< 50 mm) and routed away from VIN to minimize digital-to-analog coupling. Place a guard trace around VIN if routing near digital signals is unavoidable.
The SAR ADC's input track-and-hold requires a low-impedance source (< 100 Ω) at VIN during sampling. Use an AD8475 precision buffer or AD8450 buffer in front of VIN for high-source-impedance sensors. Settling time to 12-bit accuracy (~0.5 mV) is ~300 ns after CONVST, so the input buffer must settle within this window at full-scale step. Estimated: with a 1 kΩ source and 20 pF input capacitance, the RC time constant is 20 ns, providing 15 time constants in 300 ns - adequate for 12-bit settling.
Do not apply signals to VIN before AVDD is powered - the input ESD diodes can latch up. Always sequence AVDD first, then VDRIVE, then apply input signals. The REF pin must not be left open; connect a 10 µF decoupling capacitor as recommended in the datasheet, or tie to an external low-noise reference like ADR4525. Applying a noisy or unstable REF degrades linearity. The serial interface word is 16 bits (4 leading zeros + 12-bit MSB-first result) - ensure firmware reads exactly 16 clocks per conversion.
Thông tin tuân thủ
Lead-free matte-tin finish per 'Z' suffix per Analog Devices product page. Standard industrial grade; not AEC-Q100 qualified - choose AD7898BRUZ-10REEL7 for automotive. REACH compliance verified per ADI environmental documentation.
