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Analog Devices Inc. AD7771BCPZ-RL
- Part No.:
- AD7771BCPZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-WFQFN Exposed Pad, CSP
- Datasheet:
-
AD7771BCPZ-RL.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 64LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,053
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Product details
Overview
AD7771BCPZ-RL from Analog Devices is an 8-channel, 24-bit simultaneous sampling Σ-Δ ADC with per-channel PGA (gains 1/2/4/8), internal 2.5 V reference, and dual operating modes (high resolution: 107 dB SNR at 32 kSPS; low power: 5.25 mW/channel). It supports true differential or single-ended inputs, ±1.65 V or 3.3 V analog supplies, and operates from −40°C to +105°C - deployed in precision power quality meters and EEG systems.
For engineers reviewing the AD7771BCPZ-RL datasheet, AD7771BCPZ-RL pinout, AD7771BCPZ-RL application, or AD7771BCPZ-RL equivalent, key selection criteria include simultaneous 24-bit sampling across all 8 channels, sinc3/sinc5 low-latency digital filtering, programmable sample rate converter (SRC) for coherent line-frequency sampling, and integrated 12-bit SAR ADC for on-chip diagnostics without sacrificing main channel availability.
Technical Context
The AD7771BCPZ-RL integrates eight independent Σ-Δ modulators with configurable sinc3 or sinc5 decimation filters, enabling channel-specific latency and bandwidth optimization. Each channel includes a capacitive PGA with gain settings of 1, 2, 4, or 8 and supports ±4 nA differential input current (high resolution mode).
It implements two synchronized digital interfaces: a dedicated high-speed data output interface (DOUTx) for Σ-Δ conversion results and a full-duplex SPI interface for register configuration, SAR ADC readback, and SRC control. The device uses an internal 2.5 V reference with ±10 ppm/°C drift and supports external reference input from 1 V to 3.6 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit simultaneous sampling across all 8 channels - preserves phase coherence for multi-sensor measurements like power harmonics analysis. |
| Max ODR per channel | 128 kSPS in high resolution mode - supports wideband transient capture in industrial process monitoring. |
| SNR / Dynamic Range | 107 dB at 32 kSPS (sinc5) - enables detection of microvolt-level neural signals in EEG front-ends. |
| INL Error | ±8 ppm of FSR - ensures <0.001% full-scale accuracy for revenue-grade energy metering. |
| Input Current | ±4 nA (differential, high res mode) - allows direct connection to high-impedance piezoelectric or bio-potential sensors. |
| Power Modes | High resolution (16.6 mW/channel) and low power (5.25 mW/channel) - selectable per system thermal/noise budget. |
| Reference | Internal 2.5 V ±10 ppm/°C - eliminates external reference component count while maintaining metrology-grade stability. |
Pinout & Package
The AD7771BCPZ-RL is housed in a 64-lead LFCSP (9 mm × 9 mm, 0.85 mm height) with exposed thermal pad. Pin functions are defined per Analog Devices' Rev. C datasheet (pp. 14–16), including dedicated DCLKx, DOUTx, and DRDY per channel, plus shared SPI (SDI/SDO/SCLK/CS), GPIOs, and analog/digital supply domains.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0± to AIN7± | Differential analog inputs | Eight fully isolated input pairs accepting ±VREF/2 (bipolar) or 0–VREF (unipolar); support true differential or single-ended configuration via register control. |
| DCLK0–DCLK7 | Channel-specific data clock outputs | Provide synchronous bit-clock timing for each DOUTx stream - enables deterministic FPGA/ASIC interface design without shared clock skew. |
| DOUT0–DOUT7 | Σ-Δ conversion data outputs | Independent serial streams (twos complement) - allow parallel capture of all 8 channels without multiplexing latency or crosstalk. |
| DRDY0–DRDY7 | Channel-ready indicators | Individual ready flags signal valid data on corresponding DOUTx - simplify real-time buffering and timestamp alignment in multi-channel DAQ. |
| MCLK | Main system clock input | Accepts 0.655–8.192 MHz crystal or CMOS clock - sets base timing for all ADCs, filters, and SRC; supports jitter-tolerant operation. |
| SPI SCLK/SDI/SDO/CS | Configuration & diagnostics interface | Full-duplex SPI (Mode 0/3) controls all registers, reads SAR ADC results, and programs SRC - separates control from high-speed data paths. |
| GPIO0–GPIO2 | General-purpose I/O | Configurable as SRC update triggers or diagnostic control lines - enable hardware-synchronized filter reconfiguration without CPU intervention. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel programmable gain amplifier | Gains of 1, 2, 4, or 8 optimize dynamic range for mixed-signal sensor arrays - e.g., scaling millivolt thermocouple outputs and volt-level voltage transformers within same acquisition cycle. |
| Sample Rate Converter (SRC) | Programmable decimation ratio (sinc3: 16–4095.99; sinc5: 16–2048) enables exact ODR alignment to 50/60 Hz line frequencies - critical for harmonic distortion analysis in IEC 61000-4-30 compliance testing. |
| Dual-filter architecture | Selectable sinc3 (lower latency) or sinc5 (higher SNR) per channel - allows trade-off between real-time control loop response and measurement precision in closed-loop industrial systems. |
| Integrated 12-bit SAR ADC | 256 kSPS throughput with ±1.5 LSB INL - performs on-chip self-test, reference validation, and auxiliary signal monitoring without disabling primary Σ-Δ channels. |
| Adjustable phase synchronization | Per-channel sync offset registers (0–255 MCLK cycles) align sampling instants across distributed sensor nodes - essential for time-of-flight or phase-angle measurements in smart grid protection relays. |
Applications
| Power Quality Monitoring | Electroencephalography (EEG) |
|---|---|
Use Scenario: Real-time harmonic analysis, flicker measurement, and sag/swell detection in utility substations and industrial feeders. IC Role / Device Role / Timing Role: Simultaneous 8-channel acquisition of voltage and current waveforms with sub-microsecond inter-channel skew - captures phase relationships critical for IEC 61000-4-30 Class A compliance. Use Value: 107 dB SNR at 32 kSPS resolves 16-bit+ effective resolution for 0.1% THD measurement; SRC ensures coherent 50/60 Hz sampling eliminating spectral leakage. | Use Scenario: High-fidelity scalp potential recording from 8 electrode sites in clinical or portable EEG systems. IC Role / Device Role / Timing Role: Low-noise, low-input-current front-end digitizing microvolt-level neural signals with true differential input configuration to reject common-mode interference. Use Value: ±4 nA input bias current prevents electrode polarization; sinc5 filtering achieves >100 dB dynamic range for detecting alpha (8–13 Hz) and gamma (>30 Hz) bands amid ambient noise. |
| Industrial Process Control | General-Purpose Data Acquisition |
Use Scenario: Multi-sensor monitoring of temperature, pressure, flow, and vibration in PLC-based automation systems. IC Role / Device Role / Timing Role: Unified 8-channel Σ-Δ acquisition engine replacing discrete ADCs and signal conditioners - simplifies BOM and improves channel-to-channel matching. Use Value: ±8 ppm INL and ±15 µV offset error ensure <0.01% system accuracy over −40°C to +105°C; PGA gains adapt to varying sensor sensitivities without external op-amps. | Use Scenario: Flexible lab-grade DAQ for R&D, test benches, and educational platforms requiring configurable analog inputs. IC Role / Device Role / Timing Role: Standalone high-resolution ADC subsystem with SPI-configurable filters, gains, and ODR - reduces FPGA logic overhead and firmware complexity. Use Value: Dual power modes (16.6 mW vs. 5.25 mW/channel) support battery-powered portability or continuous bench operation; internal 2.5 V reference eliminates calibration dependency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel high-resolution ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7779BCPZ-RL | 8-channel, 24-bit, but lacks integrated SAR ADC and SRC; fixed sinc5 filter only; no per-channel sync offset registers. | Targeted at cost-sensitive, fixed-ODR applications where diagnostics and fine ODR tuning are unnecessary. | Select AD7779BCPZ-RL only when system does not require on-chip diagnostics or line-frequency coherent sampling. |
| LTC2358ILX-18#PBF | 8-channel, 18-bit SAR ADC (not Σ-Δ); 1.5 MSPS/ch; no PGA; higher power (32 mW total); no internal reference. | Better suited for wideband transient capture (e.g., motor fault detection), not ultra-low-noise DC/low-frequency measurement. | Choose LTC2358ILX-18#PBF when speed > resolution and simultaneous sampling of fast events is prioritized over SNR and dc accuracy. |
Compared with AD7779BCPZ-RL, the AD7771BCPZ-RL adds diagnostic capability and flexible SRC control; versus LTC2358ILX-18#PBF, it trades raw speed for 6-bit higher resolution, integrated signal conditioning, and 3× lower power per channel in low-noise applications.
Availability
AD7771BCPZ-RL is available at Aetrix Electronics and suitable for power quality monitoring, electroencephalography (EEG), and industrial process control requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7771BCPZ-RL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The AD7771BCPZ-RL belongs to Analog Devices' precision Σ-Δ ADC product line, engineered specifically for simultaneous multi-channel, high-accuracy data acquisition in metrology, medical instrumentation, and industrial automation.
FAQ
What is the maximum simultaneous sampling rate supported by the AD7771BCPZ-RL?
The AD7771BCPZ-RL supports up to 128 kSPS per channel in high resolution mode using the sinc5 filter path. At this rate, all eight channels sample simultaneously with matched phase response and <100 ps inter-channel skew. Lower ODRs (e.g., 32 kSPS) improve SNR to 107 dB and reduce power consumption to 5.25 mW per channel in low power mode.
Does the AD7771BCPZ-RL include an internal voltage reference?
Yes, the AD7771BCPZ-RL integrates a precision 2.5 V bandgap reference with ±10 ppm/°C typical temperature coefficient and 6.8 µV p-p (0.1 Hz to 10 Hz) noise. It can also accept external references from 1 V to 3.6 V on REFx± pins, supporting system-level calibration or higher-voltage full-scale ranges.
How does the Sample Rate Converter (SRC) function in the AD7771BCPZ-RL?
The SRC in the AD7771BCPZ-RL provides fine-grained control over output data rate by adjusting decimation ratios (sinc3: 16–4095.99; sinc5: 16–2048) via SPI. This enables exact ODR alignment to 50 Hz or 60 Hz line frequencies - for example, setting 50.000 Hz or 59.940 Hz - eliminating spectral leakage in power quality harmonic analysis.
Can the AD7771BCPZ-RL operate with single-ended analog inputs?
Yes, the AD7771BCPZ-RL supports both true differential and single-ended input configurations per channel. In single-ended mode, inputs range from 0 V to VREF/PGAGAIN with ±8 nA input current (high resolution mode), allowing compatibility with legacy sensors and unipolar signal chains without external level-shifting circuitry.
What diagnostic capabilities does the AD7771BCPZ-RL provide beyond its main Σ-Δ converters?
The AD7771BCPZ-RL includes a dedicated 12-bit SAR ADC (256 kSPS, ±1.5 LSB INL) accessible via SPI. It supports internal node monitoring (e.g., reference voltage, PGA outputs) and external signal validation using GPIO-controlled multiplexers - enabling functional safety diagnostics per IEC 61508 without interrupting primary measurement channels.
AD7771BCPZ-RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 64-WFQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 32k
- Number of Inputs:
- 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 8
- Architecture:
- Sigma-Delta
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- ±1.65V, 2.2V ~ 3.6V
- Voltage - Supply, Digital:
- 1.8V ~ 3.6V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 64-LFCSP (9x9)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7771BCPZ-RL FAQ
1.How can I place an order for AD7771BCPZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7771BCPZ-RL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD7771BCPZ-RL reliable?
The price and inventory of AD7771BCPZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7771BCPZ-RL is usually 5 days.
3.What payment methods are accepted for AD7771BCPZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7771BCPZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7771BCPZ-RL?
AD7771BCPZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7771BCPZ-RL order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD7771BCPZ-RL?
For technical support, including AD7771BCPZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7771BCPZ-RL requirements.
6.How does Aetrix verify that AD7771BCPZ-RL is sourced from the original manufacturer or authorized distributors?
All AD7771BCPZ-RL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD7771BCPZ-RL meets industry standards.
7.What is the process for return or replacement of AD7771BCPZ-RL?
All AD7771BCPZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with AD7771BCPZ-RL, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD7771BCPZ-RL part is unused and in its original packaging.
Return procedure for AD7771BCPZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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