AD7244 Analog Devices, AD7244 Datasheet
AD7244
Specifications of AD7244
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AD7244 Summary of contents
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... DSP processors and microcontrollers. A separate serial port is provided for each DAC. 3. Small Package Size The AD7242/AD7244 is available in a 24-pin DIP and a 28- pin SOIC package offering considerable space saving over comparable solutions. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. ...
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... AD7242/AD7244–SPECIFICATIONS All Specifications unless otherwise noted.) MIN MAX Parameter J, A Versions DC ACCURACY Resolution 12 Integral Nonlinearity 1 Differential Nonlinearity 1 Bipolar Zero Error 5 2 Positive Full-Scale Error 5 2 Negative Full-Scale Error 5 3 REFERENCE OUTPUT REF OUT @ +25 C 2.99/3. 2.98/3.02 MIN MAX REF OUT Tempco ...
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... V nom –5 V nom 28 mA max 15 mA max 205 mW max AD7244 ORDERING GUIDE Temperature Integral Range Nonlinearity – + LSB max – + LSB max – + LSB max 3 – +125 C 2 LSB max – ...
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... REF OUT to AGND . . . . . . . . . . . . . . –0 REF INA, REF INB to AGND . . . . . . . –0 Digital Inputs to DGND . . . . . . . . . . . . –0 Operating Temperature Range J, K Versions AD7244 . . . . . . . . . . . . . . . . . . . . . . . . . . . +70 C AD7242 . . . . . . . . . . . . . . . . . . . . . . . . . – + Versions . . . . . . . . . . . . . . . . . . . . . . . – + Version . . . . . . . . . . . . . . . . . . . . . . . . . – +125 C CAUTION 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 ...
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... DACA Voltage Reference Input. The voltage reference for DACA is applied to this pin internally buffered before being applied to DACA. The nominal reference voltage for correct operation of the AD7242/AD7244 REV. A AD7242/AD7244 PIN FUNCTION DESCRIPTION 5%. Both V pins for the device must be tied together at the device ...
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... Figure 3 shows how the AD586 reference can be conditioned to provide the 3 V reference required by the AD7242/AD7244 reference inputs. 9-bit R-2R ladder structure while on the AD7244, the 11 LSBs switch an 11-bit R-2R ladder structure. The output voltage from this converter has the same polarity as the reference voltage, REF IN ...
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... For the AD7242, the output voltage can be expressed in terms of the input code, N, using the following relationship REF IN V OUT 4096 where –2048 N +2047 For the AD7244, the output voltage can be expressed in terms of the input code, N, using the following relationship REF IN V OUT 16384 where –8192 N +8191 Table I ...
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... DAC latch for the AD7242 and and LDACB for 14 bits are transferred for the AD7244. Therefore, 4 bits in the AD7242 data stream and 2 bits in the AD7244 data stream are don’t cares since their value does not affect the DAC latch data. ...
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... The three serial lines of the first serial port, SPORT1, of the ADSP-2101/ADSP-2102 connect directly to the three serial input lines of DACA of the AD7242/AD7244. The three serial lines of SPORT2 connect directly to the three serial lines on the DACB serial input port. Data from the ADSP-2101/ADSP-2102 is valid on the falling edge of SCLK ...
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... SBUF register is correctly arranged so the don’t care bits are the first to be transmitted to the AD7242/ AD7244; the last bit to be sent is the LSB of the word to be loaded to the AD7242/AD7244. When data transmitted to the part, P3.2 (for DACA) or P3.3 (for DACB) is taken low. ...
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... Good printed circuit board layout is as important as the overall circuit design itself in achieving high speed converter perfor- mance. The AD7242 works on an LSB size of 1.465 mV, while the AD7244 works on an LSB size of 366 V. Therefore, the designer must be conscious of minimizing noise in both the converter itself and in the surrounding circuitry. Switching mode power supplies are not recommended as the switching spikes can feed through to the on-chip amplifier ...
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... AD7242/AD7244 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Plastic DIP (N-24) Cerdip (Q-24) SOIC (R-28) –12– REV. A ...