AD7943 Analog Devices, AD7943 Datasheet
AD7943
Specifications of AD7943
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AD7943 Summary of contents
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... DACs that operate from a single +5 V supply (Normal Mode) and a single +3 supply (Biased Mode). The AD7943 has a serial interface, the AD7945 has a 12-bit parallel interface, and the AD7948 has an 8-bit byte interface. They will replace the industry-standard AD7543, AD7545 and AD7548 in many applications, and they offer superior speed and power consumption performance ...
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... AD7948) DD NOTES 1 The AD7943, AD7945 and AD7948 are specified in the normal current mode configuration and in the biased current mode for single-supply applications. Figures 14 and 15 are examples of normal mode operation. 2 Temperature ranges as follows: B Grades: – + Grade: – +125 C. ...
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... DD NOTES 1 These specifications apply with the devices biased up at 1.23 V for single supply applications. The model numbering reflects this by means of a “–B” suffix (for example: AD7943AN-B). Figure example of Biased Mode Operation. 2 Temperature ranges as follows: A Versions: – + Guaranteed by design. ...
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... Design Guidance and are not subject to test. Parameter DYNAMIC PERFORMANCE Output Voltage Settling Time Digital to Analog Glitch Impulse Multiplying Feedthrough Error Output Capacitance Digital Feedthrough (AD7943) Digital Feedthrough (AD7945, AD7948) 5 Total Harmonic Distortion Output Noise Spectral Density @ 1 kHz Specifications subject to change without notice. AC PERFORMANCE CHARACTERISTICS ...
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... Units min 10 ns min 25 ns min 35 ns min 35 ns min 35 ns min 0 ns min 35 ns max Figure 1. AD7943 Timing Diagram 1.6mA OUTPUT PIN C L 50pF 200 –5– AD7943/AD7945/AD7948 Description STB Pulsewidth Data Setup Time Data Hold Time ...
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... AD7943/AD7945/AD7948 AD7945 TIMING SPECIFICATIONS Limit @ Parameter +3 NOTES 1 All input signals are specified with (10 and timed from a voltage level of 1.6 V. Specifications subject to change without notice. DB11–DB0 ...
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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 AD7943/AD7945/AD7948 feature proprietary ESD protection circuitry, perma- nent 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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... This noise is digital feedthrough. PIN CONFIGURATIONS SSOP DIP/SOP/SSOP OUT1 FB OUT1 AGND 2 REF OUT2 V DGND AD7943 CLR DB11 4 4 TOP VIEW 17 (Not to Scale) (Not to Scale) NC DB10 DB9 LD1 DB8 DGND 7 ...
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... Power supply input. This is nominally +5 V for Normal Mode Operation and +3 for Biased Mode DD Operation. V DAC reference input. REF R DAC feedback resistor pin. FB REV. B AD7943 PIN FUNCTION DESCRIPTIONS AD7945 PIN FUNCTION DESCRIPTIONS –9– AD7943/AD7945/AD7948 terminal is also connected OUT2 ...
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... AD7943/AD7945/AD7948 Pin Mnemonic Description I DAC current output terminal 1. Normally terminated at the virtual ground of output amplifier. OUT1 AGND Analog Ground Pin. This pin connects to the back gates of the current steering switches. The DAC I terminal is also connected internally to this point. DGND Digital Ground Pin. ...
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... Figure 7. All Codes Linearity In Normal Mode ( + + AMP = AD843 Figure 8. Linearity Error vs. V –11– AD7943/AD7945/AD7948 +10V REF OP AMP = AD843 1024 2048 3072 0 INPUT CODE V = +3. + AMP = AD820 0 ...
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... AD7943/AD7945/AD7948 1. +3. REF V = 1.23V BIAS OP AMP = AD820 0. + 0.00 –0.50 –1.00 0 1024 2048 INPUT CODE Figure 9. All Codes Linearity in Biased Mode ( –50 –55 –60 –65 –70 –75 –80 –85 –90 –95 –100 100 1k FREQUERCY – Hz Figure 10. Total Harmonic Distortion vs. Frequency ...
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... UNIPOLAR BINARY OPERATION (Two-Quadrant Multiplication) Figure 14 shows the standard unipolar binary connection dia- gram for the AD7943, AD7945 and AD7948. When V ac signal, the circuit performs two-quadrant multiplication. Resistors R1 and R2 allow the user to adjust the DAC gain error. With a specified gain error of 2 LSBs over temperature, these are not necessary in many applications ...
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... BIPOLAR OPERATION (Four-Quadrant Multiplication) Figure 15 shows the standard connection diagram for bipolar operation of the AD7943, AD7945 and AD7948. The coding is offset binary as shown in Table IV. When V the circuit performs four-quadrant multiplication. Resistors R1 and R2 are for gain error adjustment and are not needed in many applications where the device gain error specifications are adequate ...
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... SCK from the DSP56001 is applied to the AD7943 STB3 in- put. Data from the DSP56000 is valid on the falling edge of SCK and this is the edge which clocks the data into the AD7943 shift register. STB1, STB2 and STB4 are tied low on the AD7943 to permanently enable the STB3 input. ...
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... AD7943/AD7945/AD7948 16-Lead Plastic DIP (N-16) 0.840 (21.34) 0.745 (18.92 0.280 (7.11) 0.240 (6.10 PIN 1 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) MAX 0.130 (3.30) 0.160 (4.06) MIN 0.115 (2.93) 0.100 0.070 (1.77) SEATING 0.022 (0.558) (2.54) PLANE 0.045 (1.15) 0.014 (0.356) BSC 20-Lead Plastic DIP (N-20) 1.060 (26.90) 0.925 (23.50 0.280 (7.11) 0.240 (6.10 PIN 1 0.060 (1.52) 0.015 (0.38) ...