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Analog Devices Inc. AD7768-4BSTZ-RL7
- Part No.:
- AD7768-4BSTZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-LQFP
- Datasheet:
-
AD7768-4BSTZ-RL7.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:480
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Product details
Overview
AD7768-4BSTZ-RL7 from Analog Devices is a 4-channel, 24-bit simultaneous-sampling sigma-delta ADC optimized for high-precision ac/dc measurement systems. It delivers 108 dB dynamic range, ±2 ppm INL, and 110.8 kHz input bandwidth in fast mode-enabling accurate vibration monitoring, power quality analysis, and medical EEG/EMG acquisition with synchronized channel sampling.
For engineers reviewing the AD7768-4BSTZ-RL7 datasheet, AD7768-4BSTZ-RL7 pinout, AD7768-4BSTZ-RL7 application, or AD7768-4BSTZ-RL7 equivalent, key selection criteria include per-channel digital filtering (wideband/sinc5), programmable power-speed-bandwidth trade-offs (fast/median/low-power modes), CRC-protected SPI interface, daisy-chain capability, and embedded analog precharge buffers reducing input current and reference loading.
Technical Context
The AD7768-4BSTZ-RL7 integrates four independent Σ-Δ modulators and digital filters-one per channel-enabling true simultaneous sampling across all inputs. Its architecture supports three selectable power-speed profiles: fast mode (256 kSPS, 110.8 kHz BW, 51.5 mW/channel), median mode (128 kSPS, 55.4 kHz BW, 27.5 mW/channel), and low-power mode (32 kSPS, 13.8 kHz BW, 9.375 mW/channel).
Digital filtering includes two distinct paths: a wideband linear-phase filter (±0.005 dB passband ripple to 102.4 kHz at 256 kSPS) and a low-latency sinc5 filter (3/ODR group delay). Both filters support per-channel selection and decimation rates from ×32 to ×1024, enabling noise-performance optimization aligned with target input bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit, no missing codes-ensures monotonicity and full-scale fidelity in precision measurement systems. |
| Simultaneous Channels | 4 independent ADC channels with synchronized sampling-eliminates inter-channel phase skew in multi-sensor applications like 3-phase power or vibration analysis. |
| Dynamic Range | 108 dB (typical, shorted input, wideband filter)-supports >16-bit effective resolution for low-amplitude signal capture in noisy environments. |
| INL Error | ±2 ppm of FSR (typical)-enables high-accuracy dc measurements without system-level calibration in industrial control loops. |
| THD | −120 dB (typical, 1 kHz sine, −0.5 dBFS)-meets stringent harmonic distortion requirements for audio test equipment and medical diagnostics. |
| Power per Channel | 9.375 mW (low-power mode) to 51.5 mW (fast mode)-allows scalable energy use across battery-powered and mains-powered deployments. |
| Input Bandwidth | DC to 110.8 kHz (−3 dB, fast mode)-covers full audio band and critical power harmonics up to 50th order (5 kHz @ 100 Hz fundamental). |
| Digital Interface | SPI with CRC error checking and daisy-chain support-enables robust, multi-device data acquisition with minimal host GPIO overhead. |
Pinout & Package
AD7768-4BSTZ-RL7 is housed in a 64-lead LQFP (10 mm × 10 mm, no exposed pad), RoHS-compliant, rated for −40°C to +105°C operation. Pin functions are defined per the AD7768-4 datasheet Rev. D, Pin Configurations section (pages 24–27).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AVDD1 | Analog supply (high-voltage rail) | 5.0 V nominal supply powering core analog circuitry; requires stable low-noise regulation for optimal SNR. |
| AVDD2 | Analog supply (low-voltage rail) | 2.25 V to 5.0 V supply for modulator and reference buffers; enables flexible power partitioning and noise isolation. |
| IOVDD | Digital I/O supply | 1.8 V or 2.5 V–3.3 V logic interface supply-supports mixed-voltage system integration with FPGA or microcontroller hosts. |
| REFx+, REFx− | Differential reference inputs | Accept external reference voltage (1 V to AVDD1 − AVSS); precharge buffers reduce reference current draw and improve settling. |
| AINx+, AINx− | Differential analog inputs (x = 0–3) | Four fully differential input pairs; on-chip precharge buffers lower input current to ±20 µA max, easing front-end driver design. |
| DOUT0–DOUT3 | Serial data outputs | Independent SPI data lines per channel-enables parallel readout or daisy-chained configuration for compact PCB layout. |
| DRDY | Data ready indicator | Open-drain output signaling valid conversion data; synchronizes host read timing without polling overhead. |
| MCLK | Main clock input | Accepts 8–34 MHz CMOS or LVDS clock; determines maximum ODR and modulator sampling rate (fMOD = MCLK × 128). |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel digital filter selection | Wideband (low latency, ±0.005 dB ripple) or sinc5 (ultra-low group delay: 3/ODR) selectable independently per channel-enables mixed-signal acquisition with divergent bandwidth needs. |
| Programmable power-speed-bandwidth | Three discrete operating modes (fast/median/low-power) with defined ODR, bandwidth, and per-channel power-replaces multiple fixed-function ADCs with one configurable platform. |
| Analog input precharge buffers | Reduces differential input current to ±20 µA max-minimizes loading on high-impedance sensor interfaces (e.g., piezoelectric accelerometers) and eliminates need for external op-amp buffers. |
| Reference precharge buffers | Lowers average reference current to ±16 µA/V/channel-stabilizes reference voltage under dynamic load, improving gain accuracy and reducing reference supply noise coupling. |
| CRC-protected SPI interface | Hardware CRC generation/checking on data frames-detects transmission errors in electrically noisy industrial environments without software overhead. |
| Daisy-chain capability | Single SPI bus controls multiple AD7768-4 devices via cascaded DOUT/DIN routing-reduces host pin count and simplifies synchronization in multi-board DAQ systems. |
Applications
| Vibration & Asset Monitoring | 3-Phase Power Quality Analysis |
|---|---|
|
Use Scenario: Continuous monitoring of motor bearing vibration using piezoelectric sensors across four axes. IC Role / Device Role / Timing Role: Simultaneous 4-channel sampling captures phase-coherent time-domain waveforms for FFT-based fault detection. Use Value: 110.8 kHz bandwidth resolves harmonics up to 5× switching frequency; ±2 ppm INL ensures amplitude repeatability across thermal cycles. |
Use Scenario: Real-time measurement of voltage/current waveforms across all three phases plus neutral in smart grid meters. IC Role / Device Role / Timing Role: Four synchronized ADC channels acquire L1/L2/L3 and neutral simultaneously-preserving inter-phase timing relationships critical for unbalance and harmonic analysis. Use Value: 108 dB dynamic range captures both fundamental (kV) and 50th-harmonic (5 kHz) components within single acquisition window; daisy-chain supports multi-module expansion. |
| Medical EEG/EMG Acquisition | Audio Test & Measurement |
|
Use Scenario: Portable neurophysiology recorder capturing scalp EEG signals from four differential electrode pairs. IC Role / Device Role / Timing Role: Low-noise, low-drift ADC with precharge buffers interfaces directly to high-impedance biopotential sources without guard driving. Use Value: −120 dB THD prevents harmonic contamination of microvolt-level neural signals; 1.8 V IOVDD support enables ultra-low-power wearable designs. |
Use Scenario: High-fidelity audio analyzer measuring THD+N, IMD, and frequency response of amplifiers and transducers. IC Role / Device Role / Timing Role: Wideband filter with ±0.005 dB passband ripple preserves amplitude flatness across 20 Hz–100 kHz-meeting AES17 compliance requirements. Use Value: 24-bit resolution and 108 dB DR enable detection of sub-µV distortion products; sinc5 filter option validates transient response with <10 µs latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7768BSTZ-RL7 | 8-channel variant with identical architecture, specs, and pinout-requires PCB redesign for additional analog input traces and decoupling. | Used where ≥8 synchronized channels are required (e.g., full 3-phase + auxiliary monitoring); not drop-in compatible due to channel count mismatch. | Select AD7768BSTZ-RL7 only when system scalability beyond 4 channels is confirmed; AD7768-4BSTZ-RL7 reduces BOM cost and layout complexity for 4-sensor systems. |
| LTC2500-32I#PBF | Single-channel 32-bit delta-sigma ADC; higher resolution but no simultaneous multi-channel capability or per-channel filter selection. | Suitable for ultra-high-precision single-sensor applications (e.g., metrology standards); lacks daisy-chain, CRC, or power-scaling modes. | Choose LTC2500-32I#PBF only when absolute resolution >24 bits is mandatory and multi-channel synchronization is unnecessary. |
Compared with AD7768BSTZ-RL7, the AD7768-4BSTZ-RL7 reduces channel count and associated power/area while retaining identical per-channel performance and feature set-making it optimal for cost- and space-constrained 4-sensor systems. Compared with LTC2500-32I#PBF, it trades raw resolution for synchronized multi-channel acquisition, real-time filtering flexibility, and industrial-grade interface robustness.
Availability
AD7768-4BSTZ-RL7 is available at Aetrix Electronics and suitable for vibration monitoring, 3-phase power quality analysis, and medical EEG/EMG acquisition requiring stable component supply across industrial, test & measurement, and healthcare product lifecycles.
Supply support for AD7768-4BSTZ-RL7 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 AD7768/AD7768-4 family was designed to unify high-precision ac/dc measurement into a single configurable platform-targeting data acquisition systems where simultaneous sampling, power scalability, and embedded analog conditioning are critical.
FAQ
What is the maximum output data rate per channel for the AD7768-4BSTZ-RL7?
The AD7768-4BSTZ-RL7 supports a maximum output data rate of 256 kSPS per channel in fast mode. This is achieved with a 32.768 MHz master clock and decimation rate ×32. The device also offers median (128 kSPS) and low-power (32 kSPS) modes to balance speed, bandwidth, and power consumption. All modes maintain 24-bit resolution and no missing codes.
Does the AD7768-4BSTZ-RL7 support daisy-chaining with other ADCs?
Yes, the AD7768-4BSTZ-RL7 supports hardware daisy-chaining via its DOUT/DIN pins and DRDY synchronization signal. Multiple AD7768-4BSTZ-RL7 devices can be cascaded on a single SPI bus, allowing a host controller to read all channels with minimal GPIO usage. Daisy-chain mode preserves per-device register configuration and maintains channel-to-channel synchronization across the chain.
What are the supported logic voltage levels for the AD7768-4BSTZ-RL7 digital interface?
The AD7768-4BSTZ-RL7 supports two IOVDD ranges: 2.5 V to 3.3 V, and 1.8 V. When IOVDD = 1.8 V, the device meets specified timing and drive strength per the 1.8 V IOVDD section of the datasheet (Rev. D, Table 2). Logic thresholds scale accordingly-VINH = 0.65 × IOVDD and VINL ≤ 0.7 V-ensuring compatibility with modern low-voltage microcontrollers and FPGAs.
How does the AD7768-4BSTZ-RL7 handle reference input current to maintain accuracy?
The AD7768-4BSTZ-RL7 integrates positive and negative reference precharge buffers that reduce average reference current to ±16 µA/V/channel (typical) when enabled. This minimizes voltage drop across reference source impedance, suppresses reference glitches during conversion, and improves gain stability-especially critical when using high-output-impedance references or long PCB traces.
Can the AD7768-4BSTZ-RL7 operate with different analog supply voltages on AVDD1 and AVDD2?
Yes, the AD7768-4BSTZ-RL7 supports independent analog supplies: AVDD1 must be 4.5 V to 5.5 V (typically 5.0 V), while AVDD2 operates from 2.25 V to 5.0 V. This dual-rail architecture allows partitioning noise-sensitive modulator circuitry (on AVDD2) from higher-voltage analog front-end stages (on AVDD1), improving PSRR and overall SNR in mixed-supply systems.
AD7768-4BSTZ-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 256k
- Number of Inputs:
- 4
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 4
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2V ~ 5.5V
- Voltage - Supply, Digital:
- -
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 64-LQFP (10x10)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7768-4BSTZ-RL7 FAQ
1.How can I place an order for AD7768-4BSTZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7768-4BSTZ-RL7 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 AD7768-4BSTZ-RL7 reliable?
The price and inventory of AD7768-4BSTZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7768-4BSTZ-RL7 is usually 5 days.
3.What payment methods are accepted for AD7768-4BSTZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7768-4BSTZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7768-4BSTZ-RL7?
AD7768-4BSTZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7768-4BSTZ-RL7 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 AD7768-4BSTZ-RL7?
For technical support, including AD7768-4BSTZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7768-4BSTZ-RL7 requirements.
6.How does Aetrix verify that AD7768-4BSTZ-RL7 is sourced from the original manufacturer or authorized distributors?
All AD7768-4BSTZ-RL7 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 AD7768-4BSTZ-RL7 meets industry standards.
7.What is the process for return or replacement of AD7768-4BSTZ-RL7?
All AD7768-4BSTZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7768-4BSTZ-RL7, 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 AD7768-4BSTZ-RL7 part is unused and in its original packaging.
Return procedure for AD7768-4BSTZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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