Analog Devices Inc. AD7864BSZ-1REEL

Overview

AD7864BSZ-1REEL from Analog Devices is a 4-channel, simultaneous-sampling, 12-bit analog-to-digital converter (ADC) with 1.65 μs conversion time, ±10 V/±5 V input ranges, on-chip 2.5 V reference, and high-speed parallel interface. It preserves phase coherence across all four inputs and targets real-time motor control and power monitoring systems requiring synchronized acquisition.

For engineers reviewing the AD7864BSZ-1REEL datasheet, AD7864BSZ-1REEL pinout, AD7864BSZ-1REEL application, or AD7864BSZ-1REEL equivalent, key selection criteria include simultaneous sampling capability, aperture delay matching ≤4 ns, bipolar input support, 130 kSPS full-channel throughput, and compatibility with 5 V or 3 V digital buses via VDRIVE.

Technical Context

The AD7864BSZ-1REEL integrates four independent track-and-hold amplifiers with ≤4 ns aperture delay matching and a single 1.65 μs successive approximation ADC core. Its internal 2.5 V reference (±20 mV error over temperature) and signal scaling circuitry enable direct interfacing to ±10 V or ±5 V industrial sensor outputs without external level-shifting.

Conversion sequencing is configurable via hardware (SL1–SL4 pins) or software (DB0–DB3 register write), and timing is controlled by either internal oscillator or external CLKIN (5 MHz typical). BUSY and EOC signals provide precise status feedback for deterministic real-time system integration.

Key Specifications

Pinout & Package

AD7864BSZ-1REEL is housed in a 44-lead MQFP (0.3 inch square) package with exposed thermal pad. Pin functions are validated per Analog Devices Rev. D datasheet Figure 3 and Table 4.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-channel simultaneous-sampling ADC applications.

Compared with AD7864BSZ-1REEL, AD7865BSZ-1 trades speed for resolution and accuracy, while ADS8588HIPM expands channel count and bit depth at the expense of integration and robustness-making AD7864BSZ-1REEL optimal for cost-sensitive, space-constrained industrial control where ±10 V input support and 1.65 μs latency are critical.

Availability

AD7864BSZ-1REEL is available at Aetrix Electronics and suitable for AC motor control, uninterruptible power supplies, and data acquisition systems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for AD7864BSZ-1REEL 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, headquartered in Norwood, MA.

The AD7864 product line was designed specifically for industrial real-time control applications demanding synchronized multi-channel acquisition, robust input protection, and low-power operation from a single 5 V supply.

FAQ

What input voltage ranges does the AD7864BSZ-1REEL support?

The AD7864BSZ-1REEL supports ±10 V and ±5 V bipolar input ranges, as specified for the AD7864-1 variant. These ranges are factory-configured and do not require external scaling resistors. Input overvoltage tolerance extends to ±20 V on the ±10 V range, providing inherent protection against transients in industrial environments. The AD7864BSZ-1REEL does not support unipolar or ±2.5 V ranges-those are exclusive to AD7864-2 and AD7864-3 variants.

How does the AD7864BSZ-1REEL achieve simultaneous sampling across four channels?

The AD7864BSZ-1REEL achieves true simultaneous sampling using four independent track-and-hold amplifiers, each dedicated to one analog input pair (VIN1A/B through VIN4A/B). A single CONVST rising edge freezes all four hold capacitors at the exact same instant, preserving phase coherence. Aperture delay matching is guaranteed ≤4 ns, ensuring inter-channel timing skew remains below 0.1° at 1 kHz-critical for vector control and power quality analysis where relative phase integrity is mandatory.

Can the AD7864BSZ-1REEL interface directly with a 3 V microcontroller?

Yes, the AD7864BSZ-1REEL supports direct 3 V interfacing via its VDRIVE pin, which powers the DB0–DB11 data bus, BUSY, EOC, and FRSTDATA outputs. When VDRIVE is supplied with 3 V ±10%, the outputs meet TTL-compatible logic thresholds (VOH ≥ 2.4 V, VOL ≤ 0.4 V) while maintaining full 12-bit timing specifications. This eliminates level-shifters in mixed-voltage systems and is validated in the Rev. D datasheet timing tables for VDRIVE = 3 V operation.

What is the function of the FRSTDATA pin on the AD7864BSZ-1REEL?

The FRSTDATA pin on the AD7864BSZ-1REEL is a logic output that goes high to indicate the output data register pointer is addressing Register 1-the first valid conversion result after a CONVST-triggered sequence. It synchronizes read operations in pipelined or read-during-conversion modes, allowing the host processor to know precisely when the first channel's data is ready on DB0–DB11. This avoids blind polling and reduces software overhead in deterministic real-time systems.

Does the AD7864BSZ-1REEL include an internal voltage reference?

Yes, the AD7864BSZ-1REEL integrates a 2.5 V bandgap reference with ±10 mV error at 25°C and ±20 mV over −40°C to +85°C. This reference is accessible at the VREF pin and serves both the ADC core and on-chip signal scaling circuitry. It can be overdriven by an external 2.5 V source for improved stability, and a 0.1 μF decoupling capacitor is required between VREF and AGND per the datasheet layout guidelines to maintain SNR and THD performance.