AD7641BCPZRL - 18-Bit 2MSPS PulSAR Bipolar ADC | Analog Devices
MPN: AD7641BCPZRL ✓ Hoạt độngAD7641BCPZRL Tóm tắt
A SAR ADC is a successive-approximation-register analog-to-digital converter that performs a binary search against an internal DAC, producing a clean, single-conversion result with no pipeline latency. SAR ADCs occupy the same hierarchical slot as pipeline, sigma-delta, and flash converters within the data-converter product family, and within the broader integrated-circuit taxonomy they sit under ADC -> Data Converter -> Signal Chain IC -> Semiconductor. SAR parts are valued for deterministic latency, excellent DC accuracy, and ease of use in multiplexed multichannel systems.
Key specifications include 18-bit resolution with ±1.75 LSB INL (≈7 ppm of full scale) and +2/-1 LSB DNL (no missing codes), a fast 2 MSPS throughput, true bipolar input capability with overvoltage-tolerant analog inputs, an internal 2.5 V reference (also usable as a low-noise external reference driver), and a high-speed parallel or serial SPI-compatible interface. The device operates from a single 2.5 V digital supply and a 5 V analog supply.
Architecturally, the AD7641 integrates a high-impedance input front-end, a precision reference, the SAR core, and on-chip calibration logic; the iCMOS process allows 16 V input signal swing on a single 5 V supply. The high-throughput 2 MSPS rate and 18-bit linearity let engineers replace older bipolar-input ADCs that required external signal conditioning.
Typical applications include industrial process-control PLC analog-input cards, power-line monitoring and protection relays, medical patient-monitoring front-ends, data-acquisition modules, and multichannel instrumentation systems. The bipolar ±10 V/±5 V ranges allow direct connection to ±10 V PLC analog-output cards and 4-20 mA loop sense resistors after shunt conversion.
When designing with the AD7641BCPZRL, decouple the AVDD and DVDD rails separately, keep the input traces short and guarded, and follow the recommended reference bypass (10 µF + 100 nF) per the manufacturer datasheet to preserve 18-bit linearity.
This page synthesizes distributor pricing, drop-in PulSAR-family alternatives, and practical PCB/calibration notes not found in the standalone manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho AD7641BCPZRL — 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 AD7641BCPZRL (cùng hình factor và footprint) — khác nhau ở Package, Resolution, Data Interface, Operating Temperature, Input Type.
AD7641BCPZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7641BCPZ-1RL
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7651ACPZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7661ACP
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7676ACPRL
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7641BCPZRL Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 18 bits |
| Tỷ lệ lấy mẫu | 2 MSPS |
| Architecture | SAR (Successive Approximation Register) |
| Input Channels | 1 differential/single-ended |
| Phạm vi điện áp đầu vào | ±10 V, ±5 V, 0-10 V, 0-5 V (software/pin programmable) |
| INL (Integral Non-Linearity) | ±1.75 LSB (typ, ≈7 ppm of FS) |
| DNL (Differential Non-Linearity) | +2/-1 LSB (no missing codes) |
| Analog Supply Voltage | 5 V |
| Digital Supply Voltage | 2.5 V |
| Điện áp tham chiếu | Internal 2.5 V (external capable) |
| Data Interface | Parallel / serial SPI-compatible |
| Process Technology | PulSAR iCMOS |
| Hộp | 48-LFCSP-VQ (7x7 mm) with exposed pad |
| Nhiệt độ hoạt động | -40 °C to +85 °C |
| Trạng thái RoHS | Compliant |
Cấu hình chân AD7641BCPZRL
| Chân 1 | RANGE0 — Analog input range select bit 0 |
| Chân 2 | RANGE1 — Analog input range select bit 1 |
| Chân 3 | AGND — Analog ground |
| Chân 4 | IN+ — Differential analog input (positive) |
| Chân 5 | IN- — Differential analog input (negative) |
| Chân 6 | AGND — Analog ground (input side) |
| Chân 7 | REF — 2.5 V reference decoupling node |
| Chân 8 | REFGND — Reference ground |
| Chân 9 | AVDD — Analog supply, 5 V |
| Chân 10 | AGND — Analog ground (supply) |
| Chân 11 | DVDD — Digital supply, 2.5 V |
| Chân 12 | DGND — Digital ground |
| Chân 13 | CNVST — Conversion start (active low) |
| Chân 14 | BUSY — Conversion busy indicator |
| Chân 15 | EOC — End of conversion flag |
| Chân 16 | OB/2C — Output format select (MSB-first byte / 2's complement) |
| Chân 17 | WARP/NORM — Warp/normal mode select |
| Chân 18 | IMPULSE — Impulse mode select |
| Chân 19 | RESET — Asynchronous reset |
| Chân 20 | PD — Power-down input |
| Chân 21 | DB0 — Parallel data bit 0 (LSB) |
| Chân 22 | DB1 — Parallel data bit 1 |
| Chân 23 | DB2 — Parallel data bit 2 |
| Chân 24 | DB3 — Parallel data bit 3 |
| Chân 25 | DB4 — Parallel data bit 4 |
| Chân 26 | DB5 — Parallel data bit 5 |
| Chân 27 | DB6 — Parallel data bit 6 |
| Chân 28 | DB7 — Parallel data bit 7 |
| Chân 29 | DGND — Digital ground (I/O side) |
| Chân 30 | DB8 — Parallel data bit 8 |
| Chân 31 | DB9 — Parallel data bit 9 |
| Chân 32 | DB10 — Parallel data bit 10 |
| Chân 33 | DB11 — Parallel data bit 11 |
| Chân 34 | DB12 — Parallel data bit 12 |
| Chân 35 | DB13 — Parallel data bit 13 |
| Chân 36 | DB14 — Parallel data bit 14 |
| Chân 37 | DB15 — Parallel data bit 15 |
| Chân 38 | DB16 — Parallel data bit 16 |
| Chân 39 | DB17 — Parallel data bit 17 (MSB) |
| Chân 40 | RD — Read enable (parallel mode) |
| Chân 41 | CS — Chip select (serial/parallel mode) |
| Chân 42 | SDOUT — Serial data output |
| Chân 43 | SCLK — Serial clock |
| Chân 44 | SDIN — Serial data input |
| Chân 45 | DGND — Digital ground |
| Chân 46 | AVDD — Analog supply, 5 V (auxiliary) |
| Chân 47 | AGND — Analog ground (auxiliary) |
| Chân 48 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
AD7641BCPZRL phù hợp cho 6 Áp dụngs: Industrial PLC Analog-Input Card, Power-Line Monitoring & Protection Relay, Medical Patient Monitoring Front-End, Multichannel Data-Acquisition (DAQ) Module, Automatic Test Equipment (ATE) Instrumentation, Audio Analyzer and Precision Measurement.
Industrial PLC Analog-Input Card
The AD7641BCPZRL is purpose-built for industrial PLC analog-input modules where ±10 V bipolar signals from 4-20 mA loop shunts, transducers, and actuator feedback must be digitized at high speed and high accuracy. Its 18-bit resolution and ±1.75 LSB INL preserve measurement integrity across the industrial -40 °C to +85 °C range, while the 2 MSPS throughput supports oversampling to suppress 50/60 Hz line interference. The bipolar ±10 V/±5 V input ranges eliminate external signal-conditioning attenuators that older unipolar ADCs required, reducing BOM and PCB area. With its 48-LFCSP-VQ footprint, the AD7641BCPZRL fits 8- or 16-channel multiplexed analog front-ends using a single reference per channel.
Được đề xuất
Power-Line Monitoring & Protection Relay
Power-line monitoring relays require simultaneous high-speed capture of voltage and current waveforms to detect faults, harmonic distortion, and sag/swell events. The AD7641BCPZRL's 2 MSPS throughput on bipolar ±10 V inputs captures the full grid waveform envelope with 18-bit accuracy, while the deterministic SAR conversion latency ensures sub-cycle trip decisions. Its parallel-mode interface can stream data directly to an FPGA or DSP without SPI bottlenecks, ideal for relay firmware running synchronously with the 50/60 Hz fundamental. The 48-LFCSP-VQ package provides strong thermal performance for the high-density relay PCB, and the exposed pad offers a robust ground reference for noisy switchgear environments.
Được đề xuất
Medical Patient Monitoring Front-End
Medical patient-monitoring devices such as ECG, EEG, and hemodynamic monitors require high-DC-accuracy data acquisition to capture low-amplitude biosignals with minimal distortion. The AD7641BCPZRL's 18-bit linearity, ±1.75 LSB INL, and bipolar input ranges enable direct connection to amplified biosignal front-ends without external scaling amplifiers, reducing signal-chain complexity. The 2 MSPS throughput supports simultaneous multi-lead sampling at clinical sampling rates (typically 500 SPS to 50 kSPS per channel after decimation), while the SAR latency-free conversion is critical for safety alarms and pacing-event detection. The 48-LFCSP-VQ package fits compact bedside or wearable enclosures and supports IEC 60601-1 patient-isolation architectures.
Được đề xuất
Multichannel Data-Acquisition (DAQ) Module
Multichannel data-acquisition modules for vibration analysis, acoustic recording, and industrial test demand both high channel density and per-channel sampling accuracy. The AD7641BCPZRL, paired with an external 8:1 or 16:1 analog multiplexer, builds a flexible 8- or 16-channel DAQ subsystem at 2 MSPS aggregate throughput with 18-bit precision. The bipolar input range accepts ±10 V transducer outputs directly, the parallel data bus supports bursts to local SRAM, and the PulSAR architecture produces no digital-filter latency, preserving time-domain waveform fidelity for FFT analysis. The 48-LFCSP-VQ footprint leaves PCB room for analog input-protection circuitry and per-channel signal conditioning.
Được đề xuất
Automatic Test Equipment (ATE) Instrumentation
Automatic test equipment and bench-top instrumentation require digitizers that combine high DC accuracy with the ability to capture fast transients without pipeline or filter-induced latency. The AD7641BCPZRL's 2 MSPS SAR architecture provides single-conversion determinism, making it ideal for digitizing voltage rails in production test, characterizing DUT response to stimulus, and capturing fast programming pulses on Flash/EEPROM testers. The 18-bit resolution is sufficient for parametric measurement units (PMU) used in semiconductor test, while the bipolar ±10 V/±5 V input ranges cover most analog-IC measurement domains. The 48-LFCSP-VQ package is well-suited to high-density ATE instrument cards with parallel-data bus routing to the tester's FPGA backplane.
Được đề xuất
Audio Analyzer and Precision Measurement
Audio test equipment and precision measurement instruments require 18-bit or higher ADC dynamic range with low total harmonic distortion to verify DAC performance, speaker response, and microphone sensitivity. The AD7641BCPZRL's 18-bit linearity and SAR core provide excellent linearity with the wide input dynamic range, suitable for digitizing audio-bandwidth signals up to 2 MSPS for distortion analysis. The bipolar input allows direct connection to line-level audio ±5 V signals without external amplifiers. The internal 2.5 V reference provides low-jitter, low-noise performance required by audio analyzers, and the parallel/SPI interface supports streaming captured audio to DSP for FFT and THD analysis.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7641BCPZRL — 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 | AD7641BCPZ | AD7641BCPZ-1RL | AD7651ACPZ | AD7661ACP | AD7676ACPRL |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 48-LFCSP-VQ (7x7) | 48-LFCSP-VQ (7x7) - same | 48-LFCSP-VQ (7x7) - same | 48-LFCSP-VQ (7x7) - same | 48-LFCSP-VQ (7x7) - same | 48-LFCSP-VQ (7x7) - same |
| Resolution | 18 bits | 18 bits | 18 bits | 16 bits | 16 bits | 16 bits |
| Sampling Rate | 2 MSPS | 2 MSPS | 2 MSPS | 1 MSPS | 1 MSPS | 500 kSPS |
| Input Range | ±10 V / ±5 V / 0-10 V / 0-5 V (bipolar) | ±10 V / ±5 V / 0-10 V / 0-5 V (bipolar) | ±10 V / ±5 V / 0-10 V / 0-5 V (bipolar) | ±10 V (bipolar) | 0-5 V (unipolar) | ±5 V (bipolar) |
| INL | ±1.75 LSB | ±1.75 LSB | ±1.75 LSB | ±1.5 LSB | ±1.5 LSB | ±1 LSB |
| Architecture | SAR (PulSAR iCMOS) | SAR (PulSAR iCMOS) | SAR (PulSAR iCMOS) | SAR (PulSAR iCMOS) | SAR (PulSAR) | SAR (PulSAR) |
| Pin-Compatible Drop-In | Reference | Yes (100% identical die) | Yes (same die, -1 temp grade) | Yes (different resolution) | Yes (different resolution/input range) | Yes (different resolution/speed) |
Bảo phân biệt quan trọng
- True ±10 V bipolar input range on a single 5 V supply (vsAD7676ACPRL (16-bit, 500 kSPS))
- Highest 18-bit throughput in 48-LFCSP-VQ PulSAR family (vsAD7651ACPZ (16-bit, 1 MSPS))
- Same package, same pinout, full drop-in compatibility (vsAD7641BCPZ (non-tape-and-reel variant))
Ghi chú thiết kế
The AD7641BCPZRL requires two separate supplies: AVDD at 5 V (analog) and DVDD at 2.5 V (digital). Place a ferrite bead in series between AVDD and DVDD return paths or, at minimum, keep the analog and digital ground planes joined only at a single point beneath the IC to prevent digital switching noise coupling into the analog front-end. Per Analog Devices' reference design, each supply pin needs its own 10 µF + 100 nF ceramic bypass pair placed within 5 mm of the IC. Estimated: with 2 MSPS throughput on bipolar ±10 V input, the device draws approximately 18 mA quiescent + supply-referred reference current, so a low-noise LDO (such as the ADP7118 for AVDD) is recommended over a generic 5 V rail.
PCB layout for an 18-bit, 2 MSPS PulSAR ADC requires careful analog/digital domain separation. Keep the 48-LFCSP-VQ exposed pad (EPAD) soldered to a continuous ground plane to meet the 31.4 C/W theta_JA rating and minimize thermal-induced INL drift. Route the parallel data bus (DB0-DB17) with matched trace lengths and 50 Ω characteristic impedance if exceeding 50 mm. Keep digital traces away from the analog IN+/IN- traces, especially the reference node REF, where 18-bit linearity can be lost to even a few nV of digital switching noise.
Estimated: at 2 MSPS sampling on ±10 V inputs, the input amplifier's settling time to 18-bit accuracy (~4 ppm of full scale) must be better than 200 ns to avoid aperture-induced gain error. The Analog Devices datasheet recommends an input buffer op-amp with at least 20 MHz GBW and 0.5 µs settling - the AD8021 or AD8065 are typical choices. For unbuffered input applications, add 20 Ω series resistors between the op-amp output and IN+/IN- to dampen the SAR kickback transient from the internal sampling capacitor.
Do not omit the REF bypass capacitor network - 10 µF + 100 nF directly on REF and REFGND is required to maintain 18-bit linearity. Bypassing with only a 100 nF cap can degrade INL by 1-2 LSB. Also, do not let the analog inputs (IN+, IN-) exceed AVDD + 0.3 V or swing more than 16 V below ground, as the iCMOS process damage threshold is exceeded. Use external TVS diodes or clamp circuits when connecting to industrial transients.
Thông tin tuân thủ
RoHS and REACH compliant per Analog Devices product page; lead-free terminations. Halogen-free status not explicitly stated in the verified web data, so set to 'unknown'. AEC-Q100 is not_applicable since this part is qualified for industrial/commercial use, not automotive.