Analog Devices Inc. AD7829BRU-1REEL7

Overview

AD7829BRU-1REEL7 from Analog Devices is a high-speed, 8-channel, 8-bit parallel-output analog-to-digital converter (ADC) with 2 MSPS throughput, 420 ns conversion time, on-chip 2.5 V reference, and track-and-hold amplifier. It operates from single 3 V ±10% or 5 V ±10% supply and supports data acquisition in DSP front ends and mobile communication subsampling systems.

For engineers reviewing the AD7829BRU-1REEL7 datasheet, AD7829BRU-1REEL7 pinout, AD7829BRU-1REEL7 application, or AD7829BRU-1REEL7 equivalent, key selection considerations include its 8-channel single-ended input architecture, automatic power-down via CONVST, EOC-driven stand-alone operation, and VMID-adjustable input span for offset compensation and bipolar signal handling.

Technical Context

The AD7829BRU-1REEL7 implements a half-flash ADC architecture with coarse/fine conversion stages to achieve 8-bit resolution in 420 ns. Its track-and-hold amplifier features 10 MHz full-power bandwidth and 200 ns acquisition time, enabling accurate digitization of fast-changing signals up to 10 MHz.

Channel selection is performed externally via A2–A0 address inputs without register writes; conversion is initiated by falling edge on CONVST, and end-of-conversion is signaled by EOC pulse. Power-down is automatically triggered when CONVST is low at EOC assertion, reducing IDD from 12 mA to 5 μA.

Key Specifications

Pinout & Package

AD7829BRU-1REEL7 is housed in a 28-lead TSSOP (Thin Shrink Small Outline Package), optimized for compact PCB layouts and automated assembly. Pin pitch is 0.65 mm; package dimensions are 4.4 mm × 9.7 mm × 1.2 mm (height).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit, multi-channel ADC applications.

Compared with AD7829BRU-1REEL7, AD7829BRUZ-1 offers identical performance in a RoHS-compliant package, while MAX1138EEE+ trades VMID flexibility and autonomous timing for simpler clocking-but requires external timing infrastructure and lacks input offset adjust capability.

Availability

AD7829BRU-1REEL7 is available at Aetrix Electronics and suitable for data acquisition systems, DSP front ends, and disk drive read channels requiring stable component supply, long-term lifecycle support, and verified industrial-grade performance.

Supply support for AD7829BRU-1REEL7 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 AD7829 product line delivers high-speed, low-power, multi-channel ADCs designed for real-time signal capture in data acquisition, communications, and industrial control systems where timing determinism and analog interface flexibility are critical.

FAQ

What is the maximum input frequency the AD7829BRU-1REEL7 can accurately digitize?

The AD7829BRU-1REEL7 has a full-power bandwidth (FPBW) of 10 MHz, meaning it can convert full-scale sine wave inputs up to 10 MHz while maintaining specified SNR and distortion performance. This makes it suitable for subsampling applications in IF signal chains. The device achieves this using a high-bandwidth track-and-hold amplifier preceding its half-flash ADC core. Performance remains within datasheet limits for f_IN ≤ 10 MHz at both 3 V and 5 V supplies.

How does the VMID pin affect the input voltage range of the AD7829BRU-1REEL7?

The VMID pin sets the center point of the AD7829BRU-1REEL7's analog input span. With no connection, VMID defaults to 1.0 V (3 V supply) or 1.25 V (5 V supply), yielding input ranges of 0–2 V or 0–2.5 V respectively. When an external voltage is applied, the input range becomes VMID ±1.0 V (3 V) or VMID ±1.25 V (5 V). This allows bipolar signal support and system offset cancellation-critical for interfacing with single-supply op amps or compensating sensor offsets without additional circuitry.

Does the AD7829BRU-1REEL7 require an external clock to operate?

No, the AD7829BRU-1REEL7 does not require an external clock. Conversion timing is fully self-contained: the falling edge of CONVST initiates sampling, and the internal half-flash architecture completes conversion in 420 ns, signaled by the EOC pulse. This autonomous timing eliminates clock distribution complexity and jitter sensitivity, enabling robust stand-alone operation in microcontroller- or FPGA-based systems where precise clock routing is impractical.

What is the purpose of the automatic power-down feature in the AD7829BRU-1REEL7?

The automatic power-down feature in the AD7829BRU-1REEL7 reduces IDD from 12 mA (active) to 5 μA (power-down) by sampling the logic level on the CONVST pin at the moment EOC goes high. If CONVST is low, the ADC enters low-power state until the next CONVST falling edge. This feature cuts average power consumption in burst-mode or low-duty-cycle sampling-e.g., in battery-powered data loggers-without requiring software-controlled sleep/wake sequences or external power gating circuitry.

Can the AD7829BRU-1REEL7 interface directly with an 8051 microcontroller?

Yes, the AD7829BRU-1REEL7 interfaces directly with the 8051 microcontroller using its flexible parallel interface. RD and CS enable data bus access; A2–A0 select input channels; EOC provides interrupt-capable conversion completion signaling; and DB0–DB7 deliver straight-binary 8-bit data. Application notes confirm timing compatibility with standard 8051 buses, requiring only address decoding logic-no glue logic or FIFO buffers. The 420 ns conversion time aligns with typical 8051 instruction cycle durations for efficient polling or interrupt-driven sampling.