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Analog Devices Inc. AD7768BSTZ
- Part No.:
- AD7768BSTZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-LQFP
- Datasheet:
-
AD7768BSTZ.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,218
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Product details
Overview
AD7768BSTZ from Analog Devices is an 8-channel, 24-bit simultaneous-sampling sigma-delta ADC with per-channel Σ-Δ modulators and digital filters. It delivers 108 dB dynamic range, ±2 ppm INL, and 110.8 kHz input bandwidth in fast mode, supporting precision ac/dc acquisition in vibration monitoring, power quality analysis, and high-resolution medical EEG/ECG systems.
For engineers reviewing the AD7768BSTZ datasheet, AD7768BSTZ pinout, AD7768BSTZ application, or AD7768BSTZ equivalent, key selection criteria include channel count (8), selectable power-speed-bandwidth modes (fast/median/eco), wideband ±0.005 dB ripple filter, sinc5 low-latency path, and CRC-protected SPI interface with daisy-chaining capability.
Technical Context
The AD7768BSTZ implements eight independent Σ-Δ modulators with programmable decimation rates (×32 to ×1024), enabling per-channel filter selection between wideband linear-phase (±0.005 dB ripple, 105 dB stopband attenuation) and low-latency sinc5 response. Each channel includes analog input precharge buffers and reference precharge buffers to reduce input current and reference glitches.
It supports three operating modes: fast (256 kSPS, 110.8 kHz BW, 51.5 mW/channel), median (128 kSPS, 55.4 kHz BW, 27.5 mW/channel), and eco (32 kSPS, 13.8 kHz BW, 9.375 mW/channel), with independent power supply domains (AVDD1 = 5 V, AVDD2 = 2.25–5 V, IOVDD = 1.8/2.5–3.3 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no missing codes; ensures full-scale fidelity for high-dynamic-range sensor signals. |
| Max Output Data Rate | 256 kSPS per channel (fast mode); enables real-time capture of 110.8 kHz bandwidth signals. |
| Dynamic Range | 108 dB (typical, shorted input, wideband filter); supports >16-bit effective resolution in noise-critical applications. |
| INL Error | ±2 ppm of FSR (typical); guarantees sub-1-LSB linearity over full scale at 24-bit resolution. |
| THD | −120 dB (typical, 1 kHz sine); meets stringent harmonic distortion requirements for audio and medical diagnostics. |
| Power per Channel | 9.375 mW (eco mode); allows battery-powered or thermally constrained multi-channel systems. |
| Filter Options | Wideband (±0.005 dB ripple, 0–102.4 kHz passband) and sinc5 (low latency, 3/ODR group delay); supports both spectral accuracy and transient response needs. |
Pinout & Package
The AD7768BSTZ is housed in a 64-lead LQFP package (10 mm × 10 mm, 12 mm × 12 mm PCB footprint) with no exposed pad. Pin functions are defined per the AD7768 functional block diagram and pin configuration table (Page 22, Rev. A datasheet).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0+ to AIN7+ | Differential analog input positive | Eight fully differential input pairs; each supports ±VREF range with precharge buffer option to reduce input current. |
| AIN0– to AIN7– | Differential analog input negative | Paired with corresponding AINx+; common-mode range extends from AVSS to AVDD1. |
| REFx+, REFx– | External reference inputs | Accept 1 V to (AVDD1 − AVSS); reference precharge buffers minimize switching current transients. |
| DOUT0–DOUT7 | Serial data outputs | Eight independent DOUT lines for parallel readout; also support daisy-chained SPI output via single DOUT/DIN path. |
| ST0/CS, ST1*/SCLK, DEC0/SDO, DEC1/SDI | SPI interface control | Standard 4-wire SPI with chip select, clock, data out, data in; supports CRC error checking and register access. |
| DRDY | Data ready indicator | Active-low pulse signals valid conversion data on DOUTx; synchronized across all 8 channels in simultaneous sampling mode. |
| SYNC_IN, SYNC_OUT | Multi-device synchronization | Enables deterministic phase alignment across multiple AD7768 devices for system-level coherent sampling. |
| MODE0–MODE3/GPIO0–GPIO3 | Mode selection / GPIO | Hardware-selectable power/speed/bandwidth modes; configurable as general-purpose I/O after initialization. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel digital filtering | Independent wideband (±0.005 dB ripple) or sinc5 (3/ODR latency) filter selection per channel enables mixed-signal optimization. |
| Programmable power-speed-bandwidth trade-off | Three hardware- or SPI-selectable modes (fast/median/eco) let designers match power consumption precisely to required bandwidth and noise floor. |
| Analog input precharge buffers | Reduces differential input current to ≤20 µA (typical), minimizing signal source loading and external buffering requirements. |
| CRC-protected serial interface | Ensures data integrity on SPI bus; critical for industrial and medical systems where undetected transmission errors are unacceptable. |
| Daisy-chain capability | Allows cascading multiple AD7768 devices using single SPI bus and shared DRDY, reducing controller pin count and PCB routing complexity. |
Applications
| Vibration & Asset Monitoring | 3-Phase Power Quality Analysis |
|---|---|
Use Scenario: Continuous multi-axis acceleration sensing on rotating machinery to detect bearing faults or imbalance. IC Role / Device Role / Timing Role: Simultaneous 8-channel acquisition of piezoelectric sensor outputs with synchronized sampling and <13.8 ns inter-channel skew. Use Value: Enables time-of-flight and phase-difference analysis for precise fault localization without inter-channel timing drift. | Use Scenario: Real-time measurement of voltage/current harmonics, flicker, and unbalance across three AC phases plus neutral. IC Role / Device Role / Timing Role: 8-channel simultaneous sampling captures all phase voltages and currents (including zero-sequence) with deterministic inter-channel alignment. Use Value: Eliminates phase error in harmonic spectrum calculation, ensuring IEC 61000-4-30 Class A compliance for PQ analyzers. |
| High-Precision Medical EEG/EMG | Audio Test & Measurement |
Use Scenario: Scalp-surface biopotential recording with 24-bit resolution and ultra-low THD for clinical-grade brainwave analysis. IC Role / Device Role / Timing Role: 8-channel ADC front-end with ±2 ppm INL and −120 dB THD provides calibrated, low-distortion digitization of microvolt-level neural signals. Use Value: Preserves subtle waveform morphology (e.g., epileptiform spikes) without harmonic corruption or gain nonlinearity artifacts. | Use Scenario: Multi-channel audio analyzer capturing speaker impulse response, THD+N, and frequency sweeps with calibrated amplitude accuracy. IC Role / Device Role / Timing Role: Simultaneous sampling of reference and DUT outputs with wideband ±0.005 dB ripple filter ensures flat magnitude response up to 102.4 kHz. Use Value: Enables true RMS, FFT-based distortion analysis with <0.001 dB amplitude uncertainty across audible and ultrasonic bands. |
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 |
|---|---|---|---|
| AD7768-4BSTZ | 4-channel variant; identical architecture, specs, and pinout except reduced channel count and fewer DOUT pins. | Lower channel density suits cost-sensitive 4-sensor systems; shares same PCB footprint and firmware compatibility. | Select when only four simultaneous channels are needed-reduces BOM cost and simplifies layout without sacrificing per-channel performance. |
| LTC2500-32 | Single-channel 32-bit delta-sigma ADC; higher resolution but no simultaneous multi-channel capability or daisy-chain support. | Best for ultra-high-precision single-sensor applications (e.g., metrology standards); lacks synchronization and channel scalability. | Choose for maximum SNR (>140 dB) in single-ended measurement; avoid when multi-sensor coherence or system scalability is required. |
Compared with AD7768BSTZ, AD7768-4BSTZ offers identical per-channel performance in a 4-channel form factor with shared layout and software compatibility, while LTC2500-32 provides superior single-channel resolution but no multi-channel synchronization-making AD7768BSTZ uniquely suited for scalable, phase-coherent 8-sensor acquisition systems.
Availability
AD7768BSTZ is available at Aetrix Electronics and suitable for vibration monitoring, power quality analysis, and high-precision medical instrumentation requiring stable component supply and long-term production continuity.
Supply support for AD7768BSTZ 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 Norwood, MA.
The AD7768 product line was designed specifically for high-fidelity, multi-channel data acquisition in industrial, energy, and medical systems demanding simultaneous sampling, flexible power-noise-bandwidth scaling, and robust digital interface integrity.
FAQ
What is the maximum input bandwidth supported by the AD7768BSTZ in fast mode?
The AD7768BSTZ supports a maximum input bandwidth of 110.8 kHz in fast mode, achieved using its wideband digital filter with −3 dB point at that frequency. This bandwidth is maintained with ±0.005 dB passband ripple from dc to 102.4 kHz at 256 kSPS output rate, making AD7768BSTZ suitable for high-fidelity ac measurements including audio band and power quality harmonics up to 100 kHz.
Does the AD7768BSTZ support simultaneous sampling across all eight channels?
Yes, the AD7768BSTZ provides true simultaneous sampling across all eight analog input channels using independent Σ-Δ modulators and synchronized digital filters. The device guarantees deterministic inter-channel phase alignment with minimal skew, enabling coherent multi-sensor acquisition essential for applications like vibration analysis and 3-phase power monitoring where timing correlation between channels is critical to AD7768BSTZ system-level accuracy.
How does the power scaling feature work in the AD7768BSTZ?
The AD7768BSTZ implements three user-selectable power-speed-bandwidth modes: fast (51.5 mW/channel, 256 kSPS, 110.8 kHz BW), median (27.5 mW/channel, 128 kSPS, 55.4 kHz BW), and eco (9.375 mW/channel, 32 kSPS, 13.8 kHz BW). These modes are selected via hardware pins (MODE0–MODE3) or SPI register writes, allowing dynamic optimization of power dissipation versus noise performance and input bandwidth without changing external components-key to AD7768BSTZ adaptability in portable and thermally constrained systems.
What digital filter options are available on the AD7768BSTZ?
The AD7768BSTZ offers two primary digital filter paths per channel: a wideband linear-phase filter with ±0.005 dB passband ripple and 105 dB stopband attenuation, and a low-latency sinc5 filter with 3/ODR group delay. Both support six decimation rates (×32 to ×1024), and filter selection is configurable per channel via SPI. This dual-filter architecture gives AD7768BSTZ flexibility to serve both high-accuracy spectral analysis and fast transient capture within the same system.
Can multiple AD7768BSTZ devices be synchronized for larger channel counts?
Yes, the AD7768BSTZ includes dedicated SYNC_IN and SYNC_OUT pins to enable deterministic multi-device synchronization. By cascading SYNC_OUT of one AD7768BSTZ to SYNC_IN of another, users achieve phase-aligned sampling across devices-critical for extending channel count beyond eight while preserving inter-channel coherence. This capability, combined with daisy-chain SPI support, makes AD7768BSTZ scalable for large-channel DAQ systems without requiring additional timing controllers.
AD7768BSTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 256k
- Number of Inputs:
- 8
- Input Type:
- Differential, Pseudo-Differential
- Data Interface:
- SPI, DSP
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 8
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2V ~ 5.5V
- Voltage - Supply, Digital:
- 2V ~ 3.6V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 64-LQFP (10x10)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7768BSTZ FAQ
1.How can I place an order for AD7768BSTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7768BSTZ 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 AD7768BSTZ reliable?
The price and inventory of AD7768BSTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7768BSTZ is usually 5 days.
3.What payment methods are accepted for AD7768BSTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7768BSTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7768BSTZ?
AD7768BSTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7768BSTZ 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 AD7768BSTZ?
For technical support, including AD7768BSTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7768BSTZ requirements.
6.How does Aetrix verify that AD7768BSTZ is sourced from the original manufacturer or authorized distributors?
All AD7768BSTZ 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 AD7768BSTZ meets industry standards.
7.What is the process for return or replacement of AD7768BSTZ?
All AD7768BSTZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7768BSTZ, 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 AD7768BSTZ part is unused and in its original packaging.
Return procedure for AD7768BSTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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