AD9837 Datasheet, PDF (1/28 Pages) Analog Devices – Low Power, 8.5 mW, 2.3 V to 5.5 V, Programmable Waveform Generator

Low Power, 8.5 mW, 2.3 V to 5.5 V,
Programmable Waveform Generator
AD9837
FEATURES
Digitally programmable frequency and phase
8.5 mW power consumption at 2.3 V
MCLK speed: 16 MHz (B grade), 5 MHz (A grade)
28-bit resolution: 0.06 Hz at 16 MHz reference clock
Sinusoidal, triangular, and square wave outputs
2.3 V to 5.5 V power supply
3-wire SPI interface
Extended temperature range: −40°C to +125°C
Power-down option
10-lead LFCSP
APPLICATIONS
Frequency stimulus/waveform generation
Liquid and gas flow measurement
Sensory applications: proximity, motion,
and defect detection
Line loss/attenuation
Test and medical equipment
Sweep/clock generators
Time domain reflectometry (TDR) applications
GENERAL DESCRIPTION
The AD9837 is a low power, programmable waveform generator
capable of producing sine, triangular, and square wave outputs.
Waveform generation is required in various types of sensing,
actuation, and time domain reflectometry (TDR) applications.
The output frequency and phase are software programmable,
allowing easy tuning. The frequency registers are 28 bits wide:
with a 16 MHz clock rate, resolution of 0.06 Hz can be achieved;
with a 5 MHz clock rate, the AD9837 can be tuned to 0.02 Hz
resolution.
The AD9837 is written to via a 3-wire serial interface. This serial
interface operates at clock rates up to 40 MHz and is compatible
with DSP and microcontroller standards. The device operates
with a power supply from 2.3 V to 5.5 V.
The AD9837 has a power-down (sleep) function. Sections of the
device that are not being used can be powered down to minimize
the current consumption of the part. For example, the DAC can
be powered down when a clock output is being generated.
The AD9837 is available in a 10-lead LFCSP_WD package.
AGND DGND
FUNCTIONAL BLOCK DIAGRAM
VDD
CAP/2.5V
MCLK
28-BIT FREQ0 REG
28-BIT FREQ1 REG
AVDD/
DVDD
REGULATOR
2.5V
MUX
PHASE
ACCUMULATOR
(28-BIT)
12-BIT PHASE0 REG
12-BIT PHASE1 REG
MUX
16-BIT CONTROL REGISTER
SERIAL INTERFACE
AND
CONTROL LOGIC
ON-BOARD
REFERENCE
FULL-SCALE
CONTROL
12
SIN
MUX
10-BIT DAC
ROM
MSB
DIVIDE
BY 2
MUX
AD9837
R
200Ω
FSYNC SCLK SDATA
Figure 1.
COMP
VOUT
Rev. 0
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