AD9837ACPZ-RL7 Analog Devices Inc, AD9837ACPZ-RL7 Datasheet
AD9837ACPZ-RL7
Specifications of AD9837ACPZ-RL7
Available stocks
Related parts for AD9837ACPZ-RL7
AD9837ACPZ-RL7 Summary of contents
Page 1
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. MHz reference clock Sinusoidal, triangular, and square wave outputs 2.3 V ...
Page 2
AD9837 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Timing Characteristics ................................................................ 4 Absolute Maximum Ratings ............................................................ 5 Thermal Resistance ...................................................................... 5 ESD ...
Page 3
SPECIFICATIONS VDD = 2 5.5 V, AGND = DGND = Table 1. 1 Parameter SIGNAL DAC SPECIFICATIONS Resolution Update Rate A Grade B Grade V Maximum OUT V Minimum OUT V p OUT ...
Page 4
AD9837 TIMING CHARACTERISTICS VDD = 2 5.5 V, AGND = DGND = 0 V, unless otherwise noted. Table 2. Parameter 1 Limit MIN MAX t 62 ...
Page 5
ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 3. Parameter VDD to AGND VDD to DGND AGND to DGND CAP/2.5V Digital I/O Voltage to DGND Analog I/O Voltage to AGND Operating Temperature Range Industrial (B Version) Storage ...
Page 6
AD9837 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 5. Pin Function Descriptions Pin No. Mnemonic Description 1 COMP DAC Bias Pin. This pin is used for decoupling the DAC bias voltage. 2 VDD Positive Power Supply for the Analog and Digital ...
Page 7
TYPICAL PERFORMANCE CHARACTERISTICS 5.0 4.8 4.6 VDD = 5V 4.4 4.2 4.0 VDD = 3V 3.8 3.6 3.4 3.2 3 MCLK FREQUENCY (MHz) Figure 5. Typical Current Consumption (I for f = MCLK/10 OUT ...
Page 8
AD9837 1000 900 VDD = 2.3V 800 VDD = 5.5V 700 600 500 400 –40 – TEMPERATURE (°C) Figure 11. Wake-Up Time vs. Temperature 1.180 1.178 VDD = 2.7V 1.176 VDD = 5.0V 1.174 1.172 1.170 ...
Page 9
TEST CIRCUIT 100nF CAP/2.5V COMP REGULATOR 12 SIN 10-BIT DAC ROM AD9837 Figure 17. Test Circuit Used to Test Specifications Rev Page VDD 10nF VOUT 20pF AD9837 ...
Page 10
AD9837 TERMINOLOGY Integral Nonlinearity (INL) INL is the maximum deviation of any code from a straight line passing through the endpoints of the transfer function. The endpoints of the transfer function are zero scale, a point 0.5 LSB below the ...
Page 11
THEORY OF OPERATION Sine waves are typically thought of in terms of their magnitude form: a(t) = sin(ωt). However, sine waves are nonlinear and not easy to generate except through piecewise construction. On the other hand, the angular information is ...
Page 12
AD9837 CIRCUIT DESCRIPTION The AD9837 is a fully integrated direct digital synthesis (DDS) chip. The chip requires a reference clock and decoupling capa- citors to provide digitally created sine waves MHz. In addition to the generation of ...
Page 13
FUNCTIONAL DESCRIPTION SERIAL INTERFACE The AD9837 has a standard 3-wire serial interface that is compatible with the SPI, QSPI™, MICROWIRE®, and DSP interface standards. Data is loaded into the device as a 16-bit word under the control of a serial ...
Page 14
AD9837 Table 7. Control Register Bit Descriptions Bit Bit Name Description D13 B28 Two write operations are required to load a complete word into either of the frequency registers. B28 = 1 allows a complete word to be loaded into ...
Page 15
FREQUENCY AND PHASE REGISTERS The AD9837 contains two frequency registers and two phase registers, which are described in Table 8. Table 8. Frequency and Phase Registers Register Size Description FREQ0 28 bits Frequency Register 0. When the FSEL bit = ...
Page 16
AD9837 RESET FUNCTION The reset function resets the appropriate internal registers provide an analog output of midscale. A reset does not reset the phase, frequency, or control registers. When the AD9837 is powered up, the part should ...
Page 17
DATA WRITE (SEE FIGURE 24) SELECT DATA SOURCES WAIT 7/8 MCLK CHANGE PHASE? YES YES CHANGE CHANGE FREQUENCY? FSEL BIT? NO YES CHANGE FREQUENCY CHANGE DAC OUTPUT REGISTER? FROM SIN TO TRIANGLE? YES YES CHANGE OUTPUT TO CONTROL REGISTER A ...
Page 18
AD9837 DATA WRITE WRITE A FULL 28-BIT WORD TO A FREQUENCY REGISTER? YES (CONTROL REGISTER WRITE) B28 (D13 WRITE TWO CONSECUTIVE 16-BIT WORDS (SEE TABLE 10 FOR EXAMPLE) WRITE ANOTHER FULL 28-BIT WORD TO A FREQUENCY REGISTER? YES ...
Page 19
APPLICATIONS INFORMATION The various output options available from the AD9837 make the part suitable for a wide variety of applications, including modulation applications. The AD9837 can be used to perform simple modulation, such as frequency shift keying (FSK). More complex ...
Page 20
AD9837 AD9837 to 80C51/80L51 Interface Figure 26 shows the serial interface between the AD9837 and the 80C51/80L51 microcontroller. The microcontroller is oper- ated in Mode 0 so that TxD of the 80C51/80L51 drives SCLK of the AD9837, and RxD drives ...
Page 21
EVALUATION BOARD The AD9837 evaluation board allows designers to evaluate the high performance AD9837 DDS modulator with a minimum of effort. SYSTEM DEMONSTRATION PLATFORM The system demonstration platform (SDP hardware and software evaluation tool for use in conjunction ...
Page 22
AD9837 EVALUATION BOARD SCHEMATICS Figure 30. Evaluation Board Schematic Rev Page 09070-034 ...
Page 23
Figure 31. SDP Connector Schematic Rev Page AD9837 09070-038 ...
Page 24
AD9837 EVALUATION BOARD LAYOUT Figure 32. Evaluation Board Layout Rev Page ...
Page 25
... Range AD9837BCPZ-RL −40°C to +125°C AD9837BCPZ-RL7 −40°C to +125°C AD9837ACPZ-RL −40°C to +125°C AD9837ACPZ-RL7 −40°C to +125°C EVAL-AD9837SDZ RoHS Compliant Part. 2 The evaluation board for the AD9837 requires the system demonstration platform (SDP) board, which is sold separately. ...
Page 26
AD9837 NOTES Rev Page ...
Page 27
NOTES Rev Page AD9837 ...
Page 28
AD9837 NOTES ©2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D09070-0-4/11(0) Rev Page ...