Analog Devices Inc. AD7865BSZ-1REEL

Overview

AD7865BSZ-1REEL from Analog Devices is a four-channel, simultaneous-sampling, 14-bit analog-to-digital converter (ADC) with 2.4 µs conversion time per channel, ±5 V/±10 V input ranges, and integrated track/hold amplifiers. It operates from a single 5 V supply, consumes 115 mW typical power, and delivers 77 dB SNR at 100 kHz input - used in AC motor control and industrial power monitoring where phase-coherent multi-channel acquisition is critical.

For engineers reviewing the AD7865BSZ-1REEL datasheet, AD7865BSZ-1REEL pinout, AD7865BSZ-1REEL application, or AD7865BSZ-1REEL equivalent, key selection considerations include simultaneous sampling capability, aperture delay matching ≤4 ns, hardware/software channel sequencing, 14-bit parallel interface compatibility with 3 V/5 V processors, and ±1.5 LSB INL performance across –40°C to +85°C.

Technical Context

The AD7865BSZ-1REEL implements a successive approximation ADC architecture with four independent track/hold amplifiers, enabling true simultaneous sampling across all four analog inputs. Its internal 2.5 V reference, laser-trimmed clock oscillator, and signal scaling circuitry support precise bipolar input handling without external components.

Conversion control supports both hardware (SL1–SL4 pins) and software (DB0–DB3 register programming) channel selection modes, with CONVST triggering synchronized hold and sequence start. BUSY and EOC signals provide deterministic timing for high-throughput data capture - 100 kSPS full-channel throughput or 350 kSPS single-channel rate.

Key Specifications

Pinout & Package

AD7865BSZ-1REEL is housed in a 44-lead Plastic Quad Flatpack (PQFP), 10 mm × 10 mm body, 0.8 mm lead pitch, with exposed thermal pad (S-44 package option).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7865BSZ-1REEL, AD7656ASTZ offers greater resolution and channel density but sacrifices integrated reference and adds latency; ADS8556IPM achieves higher throughput but abandons simultaneous sampling - making AD7865BSZ-1REEL optimal for phase-critical, compact, single-supply industrial acquisition.

Availability

AD7865BSZ-1REEL is available at Aetrix Electronics and suitable for AC motor control, industrial power meters, and data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AD7865BSZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The AD7865 product line delivers simultaneous-sampling ADCs optimized for real-time control and power monitoring applications - emphasizing phase coherence, integrated signal conditioning, and robust industrial operating ranges.

FAQ

What input voltage ranges does the AD7865BSZ-1REEL support?

The AD7865BSZ-1REEL supports ±5 V and ±10 V bipolar input ranges. These ranges are factory-configured for the -1 variant and do not require external scaling resistors. Input overvoltage tolerance reaches ±18 V on the ±10 V range, protecting against field transients without affecting adjacent channel conversions. The AD7865BSZ-1REEL maintains specified DC accuracy and dynamic performance across its full input range at temperatures from –40°C to +85°C.

How does the AD7865BSZ-1REEL achieve simultaneous sampling across four channels?

The AD7865BSZ-1REEL integrates four independent track/hold amplifiers, one per analog input pair (VIN1A/VIN1B through VIN4A/VIN4B). A single rising edge on the CONVST pin places all four amplifiers into hold mode simultaneously, freezing input voltages at identical instants. This architecture ensures aperture delay matching ≤4 ns, preserving phase relationships critical for vector measurements. The AD7865BSZ-1REEL then sequentially converts the held values using its shared 14-bit SAR core.

What is the role of the VDRIVE pin on the AD7865BSZ-1REEL?

The VDRIVE pin on the AD7865BSZ-1REEL supplies power to the 14-bit parallel output drivers (DB0–DB13), BUSY, EOC, and FRSTDATA signals. It can be tied to DVDD (5 V) for standard TTL operation or driven with 3 V ±10% to interface directly with 3 V microcontrollers and DSPs - eliminating level-shifters. This flexibility allows the AD7865BSZ-1REEL to maintain timing compliance (e.g., t6 = 35 ns access time at VDRIVE = 5 V) while supporting mixed-voltage system designs.

Does the AD7865BSZ-1REEL include an internal reference, and can it be overdriven?

Yes, the AD7865BSZ-1REEL includes an internal 2.5 V ±20 mV reference accessible at the VREF pin. This reference can be overdriven by an external 2.5 V ±5% source to improve accuracy and temperature stability. A 0.1 µF decoupling capacitor is required between VREF and AGND. When using the internal reference, the AD7865BSZ-1REEL achieves ±1.5 LSB INL and 77 dB SNR; external referencing further reduces gain error drift and enhances system-level calibration repeatability.

What are the power consumption characteristics of the AD7865BSZ-1REEL in normal and standby modes?

In normal operation, the AD7865BSZ-1REEL draws 23 mA typical (32 mA max) from AVDD/DVDD at 5 V, resulting in 115 mW typical power dissipation. In standby mode (STBY = low), supply current drops to 20 µA max, reducing power to 100 µW. This low-power state retains register settings and reference bias, enabling wake-up in <1 µs. The AD7865BSZ-1REEL's 15 µW typical standby power supports battery-backed industrial controllers and portable test equipment.