Analog Devices Inc. AD7862BR-10

Overview

AD7862BR-10 from Analog Devices is a dual 12-bit simultaneous-sampling analog-to-digital converter with ±10 V input range, 250 kSPS throughput, and internal +2.5 V reference. It integrates two track-and-hold amplifiers, two successive-approximation ADCs, and a high-speed parallel interface - enabling phase-coherent acquisition in motor control and power monitoring systems.

For engineers reviewing the AD7862BR-10 datasheet, AD7862BR-10 pinout, AD7862BR-10 application, or AD7862BR-10 equivalent, this page delivers verified specifications, validated pin functions, confirmed alternative parts for ±10 V dual-channel data acquisition, and real-world design context for industrial embedded systems.

Technical Context

The AD7862BR-10 uses two independent 4 µs successive-approximation ADC cores with matched aperture delay (20 ns typ) and <200 ps inter-channel aperture matching to preserve signal phase relationships. Its internal +2.5 V reference (±10 mV @ +25°C, 25 ppm/°C) feeds both ADCs via buffered routing, eliminating external reference dependency for ±10 V full-scale operation.

Conversion is triggered by a single CONVST falling edge, placing both track/holds into hold simultaneously; BUSY goes high and remains asserted for 3.6 µs before results become available. Data is read via 12-bit parallel bus (DB0–DB11) using CS/RD/A0 handshaking, supporting microprocessor interfacing without timing glue logic.

Key Specifications

Pinout & Package

AD7862BR-10 is housed in a 28-lead SSOP (R-28) package with exposed pad not connected internally. Pin 1 and Pin 28 are NC; Pins 16 and 27 are AGND; Pin 7 is DGND; Pin 24 is VDD (+5 V ±5%). All digital I/Os are TTL-compatible with 200 µA source / 1.6 mA sink capability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel simultaneous-sampling ADC applications.

Compared with AD7863AR-10 and ADS8364IPAG, AD7862BR-10 uniquely balances ±10 V direct input capability, 28-pin SSOP footprint, and 60 mW power in a mature industrial-qualified part - making it the preferred choice for cost-sensitive, space-constrained dual-channel motor control and UPS monitoring designs.

Availability

AD7862BR-10 is available at Aetrix Electronics and suitable for AC motor control, uninterruptible power supplies, and industrial data acquisition systems requiring stable component supply across extended product lifecycles.

Supply support for AD7862BR-10 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 AD7862BR-10 belongs to Analog Devices' precision data acquisition product line, engineered specifically for phase-critical industrial sensing where simultaneous sampling, ±10 V robustness, and guaranteed 12-bit linearity are mandatory.

FAQ

What is the maximum analog input voltage the AD7862BR-10 can withstand without damage?

The AD7862BR-10 features robust overvoltage protection allowing analog inputs (VA1, VA2, VB1, VB2) to tolerate up to ±17 V relative to AGND without permanent damage. This rating applies under all operating conditions and enables direct interfacing with unconditioned industrial signals - such as transformer secondary outputs or relay contact bounce - without external clamping diodes or resistive dividers. The AD7862BR-10 maintains functional integrity after exposure, provided absolute maximum ratings are not exceeded elsewhere in the circuit.

How does the AD7862BR-10 achieve simultaneous sampling across two channels?

The AD7862BR-10 achieves true simultaneous sampling using two physically separate track-and-hold amplifiers, each with its own input path (VA1/VA2 for Channel A, VB1/VB2 for Channel B). A single CONVST falling edge triggers both track/holds to enter hold mode at precisely matched instants - with aperture delay matching specified at ≤200 ps. This architecture preserves phase coherence between sampled waveforms, unlike multiplexed single-ADC solutions where channel switching introduces timing skew. The AD7862BR-10 delivers this capability in a single 28-pin SSOP package without external synchronization components.

Does the AD7862BR-10 require an external reference voltage?

No, the AD7862BR-10 does not require an external reference voltage because it integrates a precision +2.5 V bandgap reference with ±10 mV initial error and 25 ppm/°C temperature coefficient. The VREF pin (Pin 19) serves as both output (when using internal reference) and input (to accept external +2.5 V references like AD780). For standard ±10 V operation, connecting a 0.1 µF ceramic capacitor from VREF to AGND activates the internal reference - eliminating BOM cost and layout complexity. The AD7862BR-10's internal reference meets all gain and offset accuracy specs without external components.

What is the function of the A0 pin on the AD7862BR-10?

The A0 pin on the AD7862BR-10 controls the read sequencing of conversion results from the dual ADC channels. When A0 is held low during a read cycle (CS and RD active), the parallel data bus outputs the result from VA1 (Channel A, Input 1) or VB1 (Channel B, Input 1); when A0 is high, it outputs VA2 or VB2. This allows interleaved access to both inputs per conversion event - for example, reading VA1 then VA2 to reconstruct a complete Channel A waveform. The AD7862BR-10's A0 logic eliminates the need for additional address decoding logic in microcontroller interfaces.

Is the AD7862BR-10 pin-compatible with other variants in the AD7862 family?

Yes, the AD7862BR-10 is fully pin-compatible with all AD7862-x variants (e.g., AD7862BR-3, AD7862BR-2) in the same R-28 SSOP package. Pin assignments, timing behavior, and interface signals (CONVST, BUSY, CS, RD, DB0–DB11, A0, VREF, AGND, DGND, VDD) are identical across versions. The only differences are internal scaling resistor networks defining the analog input range (±10 V for -10, ±2.5 V for -3, 0–2.5 V for -2) and output coding (twos-complement for -10/-3, straight binary for -2). This allows hardware reuse across multiple signal conditioning requirements without PCB redesign - a key advantage of the AD7862BR-10 platform.