Analog Devices Inc. AD7883BN

Overview

AD7883BN from Analog Devices is a 12-bit, single-supply SAR analog-to-digital converter optimized for battery-powered portable systems. It delivers 50 kHz throughput, 15 µs conversion time, and 70 dB SNR with VDD = 3.3 V (3 V to 3.6 V), operating in unipolar (0 to VREF) or bipolar (±VREF) input modes. Its integrated track/hold amplifier enables full-power signal digitization up to 25 kHz.

For engineers reviewing the AD7883BN datasheet, AD7883BN pinout, AD7883BN application, or AD7883BN equivalent, key selection considerations include its LC2MOS process-based low-power operation (1 mW in power-save mode), 24-pin DIP package compatibility, dual-range analog input flexibility, and timing-critical interface behavior with CONVST, RD, CS, and BUSY control signals.

Technical Context

The AD7883BN implements a charge-balanced comparator-based successive-approximation architecture with an inherent track/hold function, eliminating external sample-and-hold circuitry. Conversion is initiated asynchronously on the rising edge of CONVST and completes within 26–28 clock cycles at 2 MHz CLKIN, yielding a maximum 15 µs conversion time and 5 µs acquisition time.

Its analog front-end supports two configurable input ranges via internal resistor networks: 0 to VREF (unipolar, 12-bit straight binary output) and ±VREF (bipolar, with zero-centered code mapping). Reference is internally tied to VDD for specified performance, and MODE pin controls transition between normal (3 mA IDD) and power-save (400 µA IDD) operating states.

Key Specifications

Pinout & Package

AD7883BN is housed in a 24-pin, 0.3-inch-wide plastic dual-in-line package (DIP), designated N-24 per Analog Devices' ordering guide. This through-hole package supports prototyping, industrial control modules, and legacy board designs requiring robust mechanical mounting and hand-soldering compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX1113BCPA+, the AD7883BN uniquely combines 12-bit parallel output, hardware-selectable unipolar/bipolar input, and dedicated MODE-controlled power-save-making it irreplaceable in battery-powered DIP-based instrumentation where analog interface versatility and ultra-low quiescent power are jointly critical.

Availability

AD7883BN is available at Aetrix Electronics and suitable for portable data acquisition, laptop battery monitoring, and industrial sensor interface applications requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long-lifecycle production.

Supply support for AD7883BN 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD7883BN belongs to Analog Devices' LC2MOS precision ADC product line, engineered specifically for low-power, high-accuracy digitization in battery-operated and space-constrained embedded systems.

FAQ

What is the absolute maximum supply voltage for the AD7883BN?

The AD7883BN has an absolute maximum VDD rating of +7 V relative to AGND or DGND. However, guaranteed specifications apply only between +3.0 V and +3.6 V. Operation above +3.6 V may cause parametric degradation or permanent damage, and the AD7883BN must never be exposed to voltages exceeding +7 V on any pin, including VREF or analog inputs.

Does the AD7883BN require an external clock source, and what are its timing constraints?

Yes, the AD7883BN requires an external 2 MHz TTL-compatible clock applied to the CLKIN pin. The clock mark/space ratio must be between 40/60 and 60/40. Slower clocks increase linearity error due to hold capacitor leakage, and the AD7883BN will not meet its 12-bit accuracy specs below 2 MHz. All timing parameters-including t1 (CONVST pulse width ≥50 ns) and t7 (data access time ≤140 ns)-are validated at this frequency.

How does the MODE pin affect power consumption and initialization of the AD7883BN?

The MODE pin directly controls the AD7883BN's operating state: logic high enables normal mode (3 mA typical IDD), while logic low activates power-save mode (400 µA typical IDD). After exiting power-save mode, the AD7883BN requires one dummy conversion to reset internal logic before valid data can be read-this is mandatory for reliable operation and applies to every wake-up event.

Can the AD7883BN interface directly with a 5 V microcontroller bus?

No, the AD7883BN is not 5 V tolerant. Its digital inputs (CS, RD, CONVST, CLKIN) have a maximum VINH of 2.1 V and maximum VINL of 0.6 V when VDD = 3.3 V. Driving these pins with 5 V logic risks damage or incorrect interpretation. Level-shifting circuitry or 3.3 V–compatible MCUs (e.g., ARM Cortex-M0+) must be used to ensure correct AD7883BN operation and signal integrity.

What are the grounding requirements to achieve specified SNR and linearity for the AD7883BN?

To achieve the AD7883BN's rated 70 dB SNR and ±2 LSB INL, AGND and DGND must be connected at a single star point near the AD7883BN's AGND pin-not at the power supply or elsewhere. Analog signal traces must be guarded by AGND, and digital return paths must avoid crossing analog regions. Decoupling capacitors (10 µF + 0.1 µF) must be placed close to VDD and AGND/DGND pins to suppress supply noise that directly modulates the comparator threshold.