AD7249 Analog Devices, AD7249 Datasheet
AD7249
Specifications of AD7249
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AD7249 Summary of contents
Page 1
... +10 V, while an additional bipolar ± output range is available with dual supplies. The ranges are selected using the internal gain resistor. Interfacing to the AD7249 is serial, minimizing pin count and allowing a small package size. Standard control signals allow interfacing to most DSP processors and microcontrollers. The data stream consists of 16 bits, DB15 to DB13 are don’ ...
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... AD7249–SPECIFICATIONS + 100 pF to AGND. All specifications Parameter A Version STATIC PERFORMANCE Resolution 12 ± Relative Accuracy ± 0.9 3 Differential Nonlinearity ± Unipolar Offset Error ± Bipolar Zero Error ± Full-Scale Error ± 5 Full-Scale Temperature Coefficient ...
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... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD7249 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...
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... REFOUT should be connected to REFIN. 12 REFIN Voltage Reference Input internally buffered before being applied to both DACs. The nominal reference voltage for specified operation of the AD7249 Output Offset Resistor for the amplifier of DAC connected to V OFSB AGND for the +10 V range and to REFIN for the – ...
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... Digital Feedthrough This is a measure of the voltage spike that appears on V result of feedthrough from the digital inputs on the AD7249 measured with LDAC held high. Relative Accuracy (Linearity) Relative Accuracy, or endpoint linearity measure of the ...
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... F External Reference In some applications, the user may require a system reference or some other external reference to drive the AD7249. References such as the AD586 provide an ideal external reference source (See Figure 10). The REFIN voltage is internally buffered by a unity gain amplifier before being applied to the D/A converter. ...
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... DIGITAL INTERFACE The AD7249 contains an input serial to parallel shift register and a DAC latch for both DAC A and DAC B. A simplified diagram of the input loading circuitry is shown in Figure 7. Serial data on the SDIN input is loaded to the input register under control of SYNC and SCLK. The SYNC input provides ...
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... Dual supplies may be used to improve settling time and give increased current sink capability for the amplifier. Figure 9 shows the connection diagram for unipolar operation of the AD7249. Table I shows the digital code vs. analog output for this configuration. input the two ...
Page 9
... Good printed circuit board layout is as important as the overall circuit design itself in achieving high speed converter perfor- mance. The AD7249 works on an LSB size of 2.44 mV for the unipolar range and the bipolar ± range, when using the unipolar range the LSB size is 1.22 mV. ...
Page 10
... The data transfer is initiated by TFS going low. Data from the ADSP-2101/ADSP-2102 is clocked into the AD7249 on the falling edge of SCLK. DB12 of the 16-bit serial data stream selects the DAC to be updated. Both DACs can be updated by holding LDAC high while performing two write cycles to the DAC ...
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... SBUF register is arranged correctly so that the don’t care bits are the first to be transmitted to the AD7249 and the last bit to be sent is the LSB of the word to be loaded to the AD7249. When data transmitted to the part, P3 ...
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... BSC 16 1 0.125 (3.17) 0.364 (9.246) MIN 0.344 (8.738) 0.02 (0.5) 0.016 (0.406 0.045 (1.15) 0.020 (0.50) SDIN V V SCLK OUTA OUTA AD7249* SYNC LDAC V V OUTB OUTB 0.195 (4.95) 0.115 (2.93) Cerdip (Q-16) 9 0.271 (6.89) 0.240 (6.09) 8 PIN 1 0.300 (7.62) REF 0.780 (19.81) 0.163 (4.14) 0.133 (3.378) 0.21 (5.33) 0.15 (3.81) 0.012 (0.305) ...