Analog Devices Inc. AD9833BRM-REEL7

Overview

AD9833BRM-REEL7 from Analog Devices is a low-power, 10-bit direct digital synthesis (DDS) waveform generator IC producing sine, triangular, and square wave outputs with 28-bit frequency resolution (0.1 Hz at 25 MHz MCLK), 12.5 MHz max output frequency, and 12.65 mW power consumption at 3 V. It operates from 2.3 V to 5.5 V, features a 3-wire SPI interface, and is used in TDR, flow measurement, and sensor excitation circuits.

For engineers reviewing the AD9833BRM-REEL7 datasheet, AD9833BRM-REEL7 pinout, AD9833BRM-REEL7 application, or AD9833BRM-REEL7 equivalent, key selection criteria include its 28-bit frequency tuning resolution, integrated 10-bit DAC with on-board 200 Ω load, MSOP-10 package, −40°C to +105°C automotive-grade operation, and sleep-mode current of 0.5 mA.

Technical Context

The AD9833BRM-REEL7 implements a 28-bit phase accumulator driving a 12-bit address SIN ROM, followed by a 10-bit current-source DAC. Its DDS architecture enables continuous-phase frequency switching without glitches via dual 28-bit frequency registers (FREQ0/FREQ1) and dual 12-bit phase registers (PHASE0/PHASE1).

Control is delivered through a 3-wire SPI-compatible serial interface (FSYNC, SCLK, SDATA) supporting up to 40 MHz SCLK, with register writes requiring 16-bit words and frame synchronization via active-low FSYNC. The device includes a programmable sleep function that powers down the DAC while maintaining MCLK operation.

Key Specifications

Pinout & Package

AD9833BRM-REEL7 is housed in a 10-lead MSOP package with exposed pad (thermal performance: θ_JA = 206°C/W). Pin functions are validated per Analog Devices Rev. G datasheet Figure 5 and Table 4.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar waveform generation applications.

Compared with AD9833BRM-REEL7, AD9834BRUZ-REEL7 extends frequency capability via on-chip PLL but adds design complexity, while Si5351A-B-GMR provides multi-output digital clocks but cannot replace analog waveform synthesis - making AD9833BRM-REEL7 uniquely suited for low-power, self-contained analog excitation.

Availability

AD9833BRM-REEL7 is available at Aetrix Electronics and suitable for time-domain reflectometry, flow metering, and sensor excitation applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.

Supply support for AD9833BRM-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD983x series is designed specifically for low-power, programmable analog waveform generation in sensing, metrology, and test equipment - emphasizing integration, resolution, and temperature robustness over raw speed.

FAQ

What is the maximum output frequency supported by the AD9833BRM-REEL7?

The AD9833BRM-REEL7 supports a maximum output frequency of 12.5 MHz, limited by the Nyquist criterion relative to its 25 MHz maximum master clock (MCLK) input. This is confirmed in the General Description and Specifications sections of the Rev. G datasheet, where output frequency range is explicitly stated as 0 MHz to 12.5 MHz under all operating conditions.

Does the AD9833BRM-REEL7 require external passive components for basic operation?

No, the AD9833BRM-REEL7 requires no external passive components for core waveform generation. It integrates a 200 Ω output load resistor and an on-chip 2.5 V regulator. Only decoupling capacitors (0.1 µF + 10 µF on VDD–AGND; 100 nF on CAP/2.5V–DGND; 20 pF on COMP–AGND) are mandatory per the datasheet's Test Circuit (Figure 2) and Pin Descriptions.

How does the AD9833BRM-REEL7 achieve 28-bit frequency resolution with a 10-bit DAC?

The AD9833BRM-REEL7 achieves 28-bit frequency resolution via its numerically controlled oscillator (NCO), which uses a 28-bit phase accumulator to compute phase increments. The 10-bit DAC converts only the upper 10 bits of the 12-bit SIN ROM output - sufficient because phase truncation error is kept below DAC LSB weight by using two extra phase bits, as detailed in the Circuit Description section.

Is the AD9833BRM-REEL7 pin-compatible with other members of the AD983x family?

No, the AD9833BRM-REEL7 is not pin-compatible with AD9834 or AD9837. While all use 10-lead MSOP packages, pin assignments differ: AD9834 adds PLL-related pins (e.g., LOOPFLT), and AD9837 replaces FSYNC with a hardware RESET pin. The AD9833BRM-REEL7 pinout is unique to its 3-wire SPI interface and is defined exclusively in Figure 5 of the Rev. G datasheet.

What is the wake-up time from sleep mode for the AD9833BRM-REEL7?

The wake-up time from sleep mode for the AD9833BRM-REEL7 is 1 ms, as specified in the "LOGIC INPUTS" subsection of the Specifications table (Table 1) in the Rev. G datasheet. This value is measured from sleep exit command to valid analog output, and is guaranteed across the full −40°C to +105°C temperature range.