Analog Devices Inc. AD7886JD

Overview

AD7886JD from Analog Devices is a 12-bit, 750 kHz sampling analog-to-digital converter (ADC) with integrated sample-and-hold amplifier, LC2MOS process technology, ±5 V dual-supply operation, and pin-strappable 0 V–5 V / 0 V–10 V / ±5 V analog input ranges. It delivers 65 dB SNR at 100 kHz input and supports direct interfacing to DSPs and microprocessors via CS/RD/CONVST control.

For engineers reviewing the AD7886JD datasheet, AD7886JD pinout, AD7886JD application, or AD7886JD equivalent, this page provides verified technical context, timing-critical interface specifications, dynamic performance data (SNR, THD, IMD), package-confirmed pin functions, and validated alternative options for high-speed data acquisition systems requiring stable 12-bit resolution and sub-microsecond conversion.

Technical Context

The AD7886JD implements a triple-pass flash architecture using 15 comparators and a 4096-resistor DAC to achieve 12-bit accuracy in 950 ns typical conversion time. Its on-chip oscillator eliminates external clock requirements, and the track-and-hold amplifier acquires signals to 12-bit accuracy in ≤333 ns, enabling 1.333 µs total throughput.

Digital interface compliance includes 57 ns max data access time, 50 ns min CONVST pulse width, and three-state DB11–DB0 outputs controlled by standard CS and RD microprocessor signals. Input range selection is implemented via VIN1/VIN2 pin strapping with internal resistor networks (R1 = 9 kΩ, R2 = 6.3 kΩ).

Key Specifications

Pinout & Package

AD7886JD is packaged in a 28-pin ceramic DIP (D-28) with dual VDD (pins 10, 19), dual VSS (pins 15, 24), dual AGND (pins 16, 23), and dedicated DGND (pin 5). Pin functions are validated per Analog Devices AD7886 Rev. B datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit, high-speed ADC applications.

Compared with AD7886KD, AD7886JD trades 2 dB SNR for broader commercial availability and lower unit cost, while ADS8320U replaces parallel bus timing complexity with SPI simplicity at the expense of missing-code guarantee and onboard clocking - making AD7886JD optimal for legacy microprocessor-based designs needing guaranteed 12-bit integrity at 750 kHz.

Availability

AD7886JD is available at Aetrix Electronics and suitable for digital signal processing, spectrum analysis, speech recognition, and DSP servo control applications requiring stable component supply across commercial temperature range (0°C to +70°C).

Supply support for AD7886JD 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 is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing ICs for precision measurement and control.

The AD7886JD belongs to Analog Devices' high-speed data acquisition product line, designed specifically for real-time DSP systems requiring sub-microsecond conversion, integrated timing, and robust dc/ac performance in industrial and instrumentation environments.

FAQ

What is the maximum sampling frequency supported by the AD7886JD?

The AD7886JD supports a maximum throughput rate of 750 kHz, corresponding to a minimum sampling interval of 1.333 µs. This value is confirmed in the AD7886 Rev. B datasheet under Timing Characteristics (t13 = 1.333 µs min sampling interval) and applies to the J-version (0°C to +70°C). The 1 MHz version is documented as a separate variant (not AD7886JD) and requires consultation with Analog Devices sales.

Does the AD7886JD require an external clock source?

No, the AD7886JD does not require an external clock source. It integrates an on-chip oscillator that generates all internal timing signals for the triple-pass flash conversion process. This is explicitly stated in the General Description: "An on-chip clock oscillator provides the appropriate timing for each of the three conversion stages, eliminating the need for any external clocks." The AD7886JD operates autonomously once CONVST is asserted.

What analog input voltage ranges does the AD7886JD support, and how are they selected?

The AD7886JD supports three analog input ranges: 0 V to 5 V, 0 V to 10 V, and ±5 V. Selection is accomplished by pin-strapping VIN2 relative to VIN1, +5REF, or AGND as specified in the PIN FUNCTION DESCRIPTION section. For example, connecting VIN2 to VIN1 configures the 0 V–5 V range, while connecting VIN2 to AGND selects 0 V–10 V. No external resistors or configuration registers are needed.

What is the purpose of the +5REF, SUM, and VREF pins on the AD7886JD?

The +5REF, SUM, and VREF pins form an internal reference scaling network. The AD7886JD requires a –3.5 V reference at VREF, but accepts a standard +5 V reference at +5REF. The on-chip resistors R1 (9 kΩ) and R2 (6.3 kΩ) - connected between +5REF, SUM, and VREF - create a precision voltage divider that converts +5 V to –3.5 V. This allows use of common +5 V references (e.g., AD586) without external op-amps in basic configurations.

Is the AD7886JD pin-compatible with other variants in the AD7886 family?

Yes, the AD7886JD is pin-compatible with all AD7886 variants offered in the same package type (D-28 or P-28A2). The Ordering Guide confirms identical pin counts and functions across AD7886JD, AD7886KD, AD7886BD, and AD7886TD. Differences are limited to temperature grade, SNR, and integral linearity - all implemented internally without affecting pinout, timing, or interface behavior.