Analog Devices Inc. AD7892BR-3

Overview

AD7892BR-3 from Analog Devices is a 12-bit, single-supply successive approximation ADC with ±2.5 V analog input range, 600 kSPS throughput rate, 1.47 µs conversion time, and dual serial/parallel interface - used in high-speed data acquisition systems for industrial process monitoring and sensor signal digitization.

For engineers reviewing the AD7892BR-3 datasheet, AD7892BR-3 pinout, AD7892BR-3 application, or AD7892BR-3 equivalent, this page delivers verified technical context, real-world interface timing constraints, input range-specific accuracy specs, SOIC-24 package details, and validated alternative options for precision analog-to-digital conversion in embedded instrumentation.

Technical Context

The AD7892BR-3 integrates an on-chip track/hold amplifier with 200 ns acquisition time, internal +2.5 V reference (±10 mV error at +25°C), and LC2MOS process technology enabling bipolar ±2.5 V input scaling while operating from +5 V ±5%. Its two's complement output coding supports signed signal representation directly.

Interface selection is controlled by the MODE pin: logic high enables 12-bit parallel output (DB0–DB11), logic low enables three-wire serial mode (RFS/SCLK/SDATA). Conversion is triggered by rising edge of CONVST; EOC asserts low for ≥60 ns to signal data readiness.

Key Specifications

Pinout & Package

AD7892BR-3 is housed in a 24-lead SOIC (R-24) package with 0.3-inch body width and standard JEDEC MS-013 footprint. Pin 1 is located at the top-left corner when viewing the top side with marking dot oriented left.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7892BN-3, AD7892BR-3 offers superior thermal performance (θJA = 75°C/W) and smaller PCB footprint; compared with AD7476AARMZ, it provides integrated bipolar input scaling and reference, reducing BOM count and design risk in ±2.5 V sensor interfaces.

Availability

AD7892BR-3 is available at Aetrix Electronics and suitable for industrial process monitoring, motor control feedback, portable test equipment, and medical sensor signal conditioning requiring stable component supply across extended temperature ranges.

Supply support for AD7892BR-3 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, founded in 1965 and headquartered in Wilmington, MA.

The AD7892 product line was designed for high-speed, low-power, single-supply data acquisition in space-constrained industrial and instrumentation systems - emphasizing integrated signal conditioning, flexible interface options, and robust analog input protection.

FAQ

What is the absolute maximum analog input voltage rating for AD7892BR-3?

The AD7892BR-3 allows analog input voltages up to ±7 V on VIN1 relative to AGND without damage, per its Absolute Maximum Ratings table. This overvoltage tolerance applies specifically to the AD7892-3 variant and supports robust operation in electrically noisy industrial environments where transient spikes may occur. The rated operating input range remains ±2.5 V for accurate 12-bit conversion.

Does AD7892BR-3 require an external reference, or can it use its internal reference?

AD7892BR-3 can operate using its internal +2.5 V reference, accessed via the REF OUT/REF IN pin - simply decouple it to AGND with a 0.1 µF ceramic capacitor. The internal reference has ±10 mV error at +25°C and 25 ppm/°C temperature coefficient. An external reference (e.g., AD780) may be connected to the same pin if tighter initial accuracy or lower drift is required for the application.

How does the MODE pin affect the functionality of AD7892BR-3?

The MODE pin on AD7892BR-3 selects between parallel and serial interface modes: logic high enables 12-bit parallel output on DB0–DB11, while logic low configures pins DB3/RFS, DB4/SCLK, and DB5/SDATA for three-wire serial communication. In serial mode, DB8–DB11 must be left unconnected, and DB10/LOW and DB11/LOW must be tied to logic low to ensure correct operation.

What is the minimum acquisition time required after EOC before initiating the next conversion on AD7892BR-3?

After the EOC pulse falls, AD7892BR-3 requires a minimum track/hold acquisition time of 200 ns before the next CONVST rising edge. This interval ensures the internal track/hold amplifier settles to ±1/2 LSB accuracy following hold release. Initiating conversion earlier risks missing codes or degraded differential nonlinearity, especially at full-scale input transitions.

Is AD7892BR-3 compatible with 3.3 V logic systems?

AD7892BR-3 operates from a +5 V supply and features TTL-compatible digital outputs (VOH ≥ 4.0 V, VOL ≤ 0.4 V), so direct interface to 3.3 V logic inputs requires level translation or series resistors to avoid overstressing receiving devices. Its digital inputs accept VIH ≥ 2.4 V and VIL ≤ 0.8 V, making them compatible with 5 V-tolerant 3.3 V MCUs, but output voltage levels exceed 3.3 V absolute maximum ratings of many 3.3 V receivers.