Analog Devices Inc. AD783JRZ

Overview

AD783JRZ from Analog Devices is a high-speed, monolithic sample-and-hold amplifier (SHA) designed for precision data acquisition systems. It achieves 12-bit accuracy with 250 ns acquisition time to 0.01%, 15 MHz small-signal bandwidth, ±2.5 V input range, and operates on dual ±4.75 V to ±5.25 V supplies. It is used as front-end signal conditioning before high-resolution ADCs such as AD671 and AD7586 in instrumentation and communications receivers.

For engineers reviewing the AD783JRZ datasheet, AD783JRZ pinout, AD783JRZ application, or AD783JRZ equivalent, key selection considerations include aperture jitter (20 ps typ), hold-mode offset (±5 mV), nonlinearity (±0.005% FS), droop rate (0.02–1 µV/µs), and SOIC-8 package compatibility with board-level timing-critical analog signal chains.

Technical Context

The AD783JRZ implements a self-correcting architecture that actively compensates for charge injection, gain error, and offset after the hold command-enabling accurate held output despite inaccurate sample-mode behavior. Its internal hold capacitor eliminates external component requirements.

It features single-ended input/output referenced to COMMON, no separate analog/digital ground pins, and relies on tight supply decoupling (0.1 µF ceramic at VCC/VEE) to maintain THD of –80 dB at 100 kHz and SNR+D of 77 dB. Aperture jitter (20–50 ps) directly limits usable input frequency before quantization noise dominates.

Key Specifications

Pinout & Package

AD783JRZ is housed in an 8-lead narrow-body SOIC (SOIC_N, R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch and gull-wing leads. Pin 1 identifier is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar sample-and-hold amplifier applications.

Compared with HA-5320IBZ and LF398N/NOPB, the AD783JRZ delivers superior speed–accuracy trade-off for 12-bit systems: fastest acquisition (250 ns), lowest offset (±5 mV), and integrated error correction-making it optimal for precision undersampling and high-throughput DAQ where timing margin is constrained.

Availability

AD783JRZ is available at Aetrix Electronics and suitable for high-speed data acquisition, IF sampling receivers, 12-bit ADC interfacing, and communications test equipment requiring stable component supply and RoHS-compliant packaging.

Supply support for AD783JRZ 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, founded in 1965 and headquartered in Wilmington, MA.

The AD783JRZ belongs to Analog Devices' precision sample-and-hold amplifier product line, engineered specifically for high-speed, high-resolution data acquisition systems demanding minimal external components and guaranteed 12-bit accuracy without calibration.

FAQ

What is the maximum input frequency the AD783JRZ can accurately sample?

The AD783JRZ supports accurate sampling up to ~5 MHz for full-scale signals, limited primarily by its 2 MHz full-power bandwidth and aperture jitter (20–50 ps). At 100 kHz input, THD is –80 dB and SNR+D is 77 dB; performance degrades above 500 kHz due to increasing distortion and jitter-induced noise. For IF undersampling (e.g., 10.7 MHz), amplitude must be reduced (e.g., 255 mV_p-p) to maintain usable dynamic range, as confirmed in AD783JRZ application examples with AD670.

Does the AD783JRZ require external hold capacitors?

No, the AD783JRZ does not require external hold capacitors. It integrates a precision on-chip hold capacitor as part of its monolithic design, eliminating layout sensitivity, trimming, and external component count. This is explicitly stated in the Functional Description section of the AD783JRZ datasheet and verified in typical application circuits (e.g., Figure 8 and Figure 9), where no external capacitor is shown or specified.

What is the role of the COMMON pin on the AD783JRZ?

The COMMON pin on the AD783JRZ serves as the unified reference node for analog input, analog output, and digital control signals-it is not split into separate analog and digital grounds. Per the AD783JRZ grounding guidelines, COMMON must be connected directly to the ADC's analog ground reference with a dedicated low-inductance trace, and also tied to the system digital ground at the ADC location to avoid ground loops. This single-point grounding is essential to achieve specified THD and noise performance.

Can the AD783JRZ operate from a single supply?

No, the AD783JRZ requires dual symmetric supplies: ±4.75 V to ±5.25 V. Its architecture depends on balanced positive (VCC) and negative (VEE) rails to bias internal circuitry and support ±2.5 V input/output swing. The Absolute Maximum Ratings table explicitly defines VCC and VEE with respect to COMMON, and all specifications-including offset, bandwidth, and noise-are characterized only under dual-supply conditions. Single-supply operation is not supported or tested.

How does the self-correcting architecture of the AD783JRZ improve accuracy?

The AD783JRZ self-correcting architecture actively compensates for internal errors-including charge injection, amplifier gain error, and offset-after the hold command is issued. Unlike conventional SHAs, its output in sample mode is not intended to track the input accurately; instead, internal reconfiguration during hold mode corrects these errors to produce a highly accurate held value. This is why hold-mode offset is specified at ±5 mV (vs. ±200 mV in sample mode) and why nonlinearity remains ±0.005% FS across the full ±2.5 V range.