Analog Devices Inc. AD783JQ

Overview

AD783JQ from Analog Devices is a high-speed, monolithic sample-and-hold amplifier (SHA) designed for precision data acquisition systems requiring 12-bit accuracy at sub-300 ns acquisition times. It features ±2.5 V input range, 15 MHz small-signal bandwidth, 2 MHz full-power bandwidth, and integrated hold capacitor - enabling direct interface with 12-bit ADCs like AD671 and AD7586 in multichannel instrumentation and IF sampling applications.

For engineers reviewing the AD783JQ datasheet, AD783JQ pinout, AD783JQ application, or AD783JQ equivalent, key selection considerations include aperture jitter (20–50 ps), hold-mode offset (±5 mV), droop rate (0.02–1 µV/µs), and compatibility with ±5 V dual supplies - critical for high-fidelity signal conditioning before high-speed analog-to-digital conversion.

Technical Context

The AD783JQ implements a self-correcting architecture that actively compensates for charge injection, gain error, and offset after the hold command - ensuring accurate held output despite non-ideal sample-mode behavior. Its single-ended input/output structure references COMMON (pin 3), with no separate analog/digital ground pins.

It operates across 0°C to +70°C (J-grade), requires ±4.75 V to ±5.25 V supplies, draws 9.5–17 mA total supply current, and delivers ±5 mA output drive while maintaining <2.5 mV hold-mode offset shift - making it suitable for driving ADC inputs without external buffering in many configurations.

Key Specifications

Pinout & Package

AD783JQ is housed in an 8-lead Ceramic Dual In-Line Package (CERDIP), designated Q-8 per Analog Devices ordering guide. The package is hermetically sealed, rated for 0°C to +70°C operation, and features 0.100" lead pitch with JEDEC-standard dimensions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD783JR and HA-5320, the AD783JQ provides superior DC accuracy (±5 mV offset vs. ±15 mV), integrated hold capacitance, and self-correction - making it the optimal choice for 12-bit precision applications demanding minimal external components and guaranteed performance over temperature.

Availability

AD783JQ is available at Aetrix Electronics and suitable for high-speed data acquisition, IF sampling receivers, test equipment, and medical imaging signal chains requiring stable component supply and long-term obsolescence management.

Supply support for AD783JQ 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 AD783JQ belongs to Analog Devices' precision sample-and-hold amplifier product line, engineered specifically for high-fidelity signal capture in 12-bit data acquisition systems where speed, linearity, and DC stability must coexist without external trimming.

FAQ

What is the maximum input frequency the AD783JQ can accurately sample?

The AD783JQ's usable input frequency is constrained by aperture jitter and distortion. With typical 20 ps aperture jitter, it maintains ≤½-LSB error up to ~12 MHz for 12-bit resolution. At 500 kHz, THD is –72 dB and S/(N+D) is 70 dB - confirming suitability for IF sampling up to several MHz when paired with appropriate anti-alias filtering. The AD783JQ's 15 MHz small-signal bandwidth supports this performance envelope.

Does the AD783JQ require external components to operate?

No, the AD783JQ is fully self-contained and requires no external hold capacitor, trim pots, or passive components to perform its core sample-and-hold function. Only mandatory external elements are 0.1 µF ceramic decoupling capacitors from VCC and VEE to COMMON, as specified in the datasheet grounding guidelines. All compensation and correction are implemented internally via its proprietary self-correcting architecture.

How does the AD783JQ handle power supply noise?

The AD783JQ provides 45–65 dB power supply rejection ratio (PSRR) on both +VCC and –VEE rails, meaning a 100 mVpp supply ripple induces only ~0.2–0.35 mVpp error at the held output. This allows use with moderately regulated supplies, provided local 0.1 µF ceramic decoupling is placed directly at each supply pin. The AD783JQ's PSRR rolls off above 100 kHz, so high-frequency noise must be filtered before reaching the device.

Can the AD783JQ drive an ADC input directly without a buffer amplifier?

Yes, the AD783JQ can directly drive many 12-bit ADC inputs - its ±5 mA output drive capability, 0.3–0.6 Ω output resistance, and 150 ns hold settling time allow it to settle within specification before ADC conversion starts. However, if the ADC input presents significant capacitive load (>50 pF) or requires level shifting, an op amp buffer (e.g., AD841) is recommended. The AD783JQ's output is optimized for low-impedance loads matching standard ADC input specs.

What is the role of the COMMON pin on the AD783JQ?

The COMMON pin (pin 3) serves as the unified reference node for all analog and digital functions: it is the ground reference for the ±2.5 V input range, the 0 V reference for the held output voltage, and the return path for digital control current on the S/H pin. Unlike converters with separate AGND/DGND, the AD783JQ internally connects all grounds to COMMON - so it must be tied directly to the ADC's analog ground with a low-inductance trace, and digital ground should connect at the ADC to avoid ground loops.