Analog Devices Inc. AD7768BSTZ-RL

Overview

AD7768BSTZ-RL from Analog Devices is an 8-channel, 24-bit simultaneous-sampling sigma-delta ADC with per-channel Σ-Δ modulator and digital filter, delivering 108 dB dynamic range at 110.8 kHz input bandwidth, ±2 ppm INL, and −120 dB THD typical. It supports three power-speed modes (Fast/Median/Eco), operates from −40°C to +105°C, and targets high-precision data acquisition in vibration monitoring and 3-phase power quality analysis.

For engineers reviewing the AD7768BSTZ-RL datasheet, AD7768BSTZ-RL pinout, AD7768BSTZ-RL application, or AD7768BSTZ-RL equivalent, key selection criteria include simultaneous 8-channel sampling capability, programmable decimation rates (×32 to ×1024), wideband low-ripple filter (±0.005 dB passband), sinc5 low-latency path, and support for 1.8 V/2.5 V/3.3 V IOVDD with dual analog supplies (AVDD1 = 5 V, AVDD2 = 2.25–5 V).

Technical Context

The AD7768BSTZ-RL implements eight independent Σ-Δ modulators with dedicated digital filter engines-each configurable for wideband linear-phase or low-latency sinc5 response. Its clocking architecture accepts 8–34 MHz crystal or external MCLK, enabling precise synchronization across all channels via SYNC_IN/SYNC_OUT.

Power scaling is achieved through three discrete 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 per-channel filter selection and decimation rate control (×32–×1024).

Key Specifications

Pinout & Package

AD7768BSTZ-RL is housed in a 64-lead LQFP package (10 mm × 10 mm body, 12 mm × 12 mm PCB footprint) with no exposed pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution simultaneous-sampling ADC applications.

Compared with AD7768BSTZ-RL, AD7768-4BSTZ-RL offers identical performance per channel in a smaller footprint but halves channel count, while LTC2500-32IUK#PBF trades multi-channel synchronization for extreme single-channel resolution-neither provides drop-in replacement capability due to differing channel architecture and interface topology.

Availability

AD7768BSTZ-RL is available at Aetrix Electronics and suitable for vibration monitoring, 3-phase power quality analysis, and high-precision medical EEG/EMG systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7768BSTZ-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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The AD7768BSTZ-RL belongs to Analog Devices' precision sigma-delta ADC product line, engineered for simultaneous multi-channel ac/dc data acquisition in industrial, energy, and medical instrumentation where synchronization, dynamic range, and power scalability are critical.

FAQ

What is the maximum output data rate per channel for the AD7768BSTZ-RL?

The AD7768BSTZ-RL 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 using the wideband filter. Lower rates (128 kSPS and 32 kSPS) are available in Median and Eco modes, respectively, to optimize power versus bandwidth.

Does the AD7768BSTZ-RL support daisy-chaining for multi-device synchronization?

Yes, the AD7768BSTZ-RL supports daisy-chaining via its DRDY, DOUT, and ST0/CS pins. Up to eight devices can be cascaded on a single SPI bus while maintaining sample synchronization through the SYNC_IN/SYNC_OUT signals. Each device outputs its channel data sequentially on shared DOUT lines with CRC error checking enabled.

What are the supported IOVDD voltage levels for the AD7768BSTZ-RL?

The AD7768BSTZ-RL supports IOVDD at 1.8 V, 2.5 V, or 3.3 V. When operating at 1.8 V IOVDD, specific logic level thresholds and timing parameters apply (detailed in Table 2 of the datasheet). The device maintains full functionality-including SPI communication, DRDY assertion, and GPIO operation-across all three I/O voltage options.

How does the AD7768BSTZ-RL achieve 108 dB dynamic range with simultaneous 8-channel sampling?

The AD7768BSTZ-RL achieves 108 dB dynamic range by integrating eight independent Σ-Δ modulators and digital filters, eliminating crosstalk-induced noise coupling. Each channel uses analog input precharge buffers to minimize switching current, and the wideband filter provides 105 dB stopband attenuation at Nyquist-ensuring clean separation of signals across all 8 channels simultaneously.

What is the function of the VCM pin on the AD7768BSTZ-RL?

The VCM pin on the AD7768BSTZ-RL is a buffered common-mode voltage output that can be configured to (AVDD1 − AVSS)/2, 1.65 V, or 2.5 V. It drives the common-mode level for external analog front-end circuitry (e.g., differential drivers or sensor interfaces), reducing layout sensitivity and improving noise immunity in high-impedance signal paths.