Analog Devices Inc. AD7827BRZ-REEL7

Overview

AD7827BRZ-REEL7 from Analog Devices is an 8-bit, 1 MSPS serial-output sampling ADC with on-chip track-and-hold, 2.5 V reference (±2%), and dual-supply operation (3 V ±10% or 5 V ±10%). It delivers 420 ns conversion time, 200 ns acquisition time, and supports single-ended 0 V–2 V (3 V supply) or 0 V–2.5 V (5 V supply) input ranges. It is used in real-time DSP data acquisition systems requiring low-latency analog digitization.

For engineers reviewing the AD7827BRZ-REEL7 datasheet, AD7827BRZ-REEL7 pinout, AD7827BRZ-REEL7 application, or AD7827BRZ-REEL7 equivalent, key selection considerations include its automatic power-down timing via CONVST, 3-wire SPI-compatible serial interface (RFS/DOUT/SCLK), guaranteed no missing codes at 8 bits, and industrial temperature range (–40°C to +105°C).

Technical Context

The AD7827BRZ-REEL7 implements a half-flash architecture: a 4-bit flash ADC generates MSBs, followed by a second flash stage for LSBs-achieving full 8-bit resolution in ≤420 ns. Its track-and-hold acquires input within 200 ns and holds for 120 ns during conversion.

Timing is tightly coupled to the external SCLK: RFS falls after conversion completion to signal valid data, and DOUT shifts out MSB-first on rising SCLK edges. The CONVST pin serves dual roles-initiating conversion on its falling edge and enabling automatic power-down when sampled low ~530 ns post-conversion.

Key Specifications

Pinout & Package

AD7827BRZ-REEL7 is housed in an 8-lead SOIC package (SO-8), 3.9 mm × 4.9 mm body, 1.27 mm pitch, RoHS-compliant, tape-and-reel format (REEL7 = 1000-piece reel).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit, serial-interface sampling ADC applications.

Compared with AD7827BRZ-REEL7, AD7823BRZ trades integrated reference for marginally better DC specs but adds external component overhead, while MAX1113ECM+ offers smaller footprint and higher speed but removes hardware frame sync-making AD7827BRZ-REEL7 optimal for robust, low-complexity DSP interfacing with minimal support circuitry.

Availability

AD7827BRZ-REEL7 is available at Aetrix Electronics and suitable for industrial PLCs, motor control systems, portable medical devices, and DSP-based audio acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7827BRZ-REEL7 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 AD7827BRZ-REEL7 belongs to Analog Devices' legacy high-speed sampling ADC product line, designed specifically for real-time embedded systems requiring low-latency, low-power, and DSP-native serial interfacing without external support components.

FAQ

What is the reference voltage configuration for AD7827BRZ-REEL7?

The AD7827BRZ-REEL7 features an internal 2.5 V ±2% reference connected to the VREF pin, which functions as both output (when internal reference is used) and input (to accept external 2.5 V). The device does not support reference voltage scaling or adjustment-the VREF pin voltage is fixed at 2.5 V regardless of operating mode, and deviation outside 2.45 V–2.55 V violates specification.

Does AD7827BRZ-REEL7 support true SPI communication?

The AD7827BRZ-REEL7 implements a 3-wire serial interface compatible with SPI timing conventions but lacks dedicated chip select (CS) and MOSI lines. It uses RFS as a frame-sync signal instead of CS, and DOUT as unidirectional output only. While it interoperates with SPI-capable microcontrollers via software bit-banging or configured serial ports, it is not a full SPI slave per JEDEC standards.

Can AD7827BRZ-REEL7 operate with a 3.3 V supply?

No-AD7827BRZ-REEL7 is specified only for 3 V ±10% (2.7 V–3.3 V) or 5 V ±10% (4.5 V–5.5 V). Operation at exactly 3.3 V falls within the 3 V tolerance band and is supported, but the device's input range switches to 0 V–2.0 V and internal biasing assumes nominal 3 V operation. Do not apply 3.3 V expecting 5 V-range behavior.

How does the automatic power-down function work on AD7827BRZ-REEL7?

AD7827BRZ-REEL7 samples the logic state of the CONVST pin approximately 530 ns after its falling edge. If CONVST remains low at that instant, the device enters power-down mode (IDD ≤ 1 µA). Power-up occurs on the next rising edge of CONVST. This allows precise, single-pin control of energy consumption without additional control lines or timing logic.

Is AD7827BRZ-REEL7 pin-compatible with AD7827BN or AD7827BR?

Yes-AD7827BRZ-REEL7 shares identical pinout, electrical specifications, and timing behavior with AD7827BN (PDIP-8) and AD7827BR (SOIC-8). The "Z" suffix denotes lead-free/RoHS-compliant packaging, and "REEL7" indicates 1000-unit tape-and-reel packaging; all three variants use the same silicon die and functional design.