AD574 Analog Devices, AD574 Datasheet
AD574
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AD574 Summary of contents
Page 1
... The AD574A is available in six different grades. The AD574AJ, K, and L grades are specified for operation over the +70 C temperature range. The AD574AS, T, and U are speci- fied for the – +125 C range. All grades are available in a 28-pin hermetically-sealed ceramic DIP. Also, the J, K, and L grades are available in a 28-pin plastic DIP and PLCC, and the J and K grades are available in ceramic LCC ...
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... AD574ASD AD574AKD AD574AJN AD574AKN AD574AJP AD574AKP AD574AJE AD574AKE or Digital Common. LOGIC –2– – –12 V LOGIC EE AD574AL Max Min Typ Max Units 12 12 Bits 1/2 1/2 LSB 1/2 1/2 LSB 12 Bits 1 1 LSB ...
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... AD574ASD AD574ATD or Digital Common. LOGIC –3– AD574A AD574AU Max Min Typ Max Units 12 12 Bits 1/2 1/2 LSB 1 1 LSB 12 Bits 1 1 LSB 4 2 LSB 0.25 0.125 % of FS +125 –55 +125 C 1 (2.5) 1 (2.5) ...
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... X = Package designator. Available packages are: D (D-28) for all grades. E (E-28A) for J and K grades and /883B processed S, T and U grades. N (N-28) for J, K, and L grades. P (P-28A) for PLCC grades. Example: AD574AKN is K grade in plastic DIP. 2 For details on grade and package offerings screened in accordance with MIL-STD-883, refer to Analog Devices Military Products Databook ...
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... Thus every code must have a finite width. For the AD574AK and U grades, which guarantee no missing codes to 12-bit resolution, all 4096 codes must be present over the entire operating tem- perature ranges. The AD574AJ and S grades guarantee no miss- ing codes to 11-bit resolution over temperature ...
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... The amplifier should have acceptable loop gain at 500 kHz for use with the AD574A. To check whether the output properties of a signal source are suitable, monitor the AD574’s input with an oscilloscope while a conver- sion is in progress ...
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... The nominal input impedance into Pin and 10 k into Pin 14. UNIPOLAR CALIBRATION The AD574A is intended to have a nominal 1/2 LSB offset so that the exact analog input for a given code will be in the middle of that code (halfway between the transitions to the codes above and below it) ...
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... TIMING The AD574A is easily interfaced to a wide variety of micropro- and O cessors and other digital systems. The following discussion of line is O the timing requirements of the AD574A control signals should provide the system designer with useful insight into the opera- tion of the device ...
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... Figure 7 shows a complete timing diagram for the AD574A con- vert start operation. R/C should be low before both CE and CS are asserted; if R/C is high, a read operation will momentarily occur, possibly resulting in system bus contention. Either may be used to initiate a conversion; however, use recommended since it includes one less propagation delay than CS and is the faster input ...
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... Figure 14. AD574A Data Format for 8-Bit Bus SPECIFIC PROCESSOR INTERFACE EXAMPLES Z-80 System Interface The AD574A may be interfaced to the Z-80 processor in an I/O or memory mapped configuration. Figure 15 illustrates an I/O or mapped configuration. The Z-80 uses address lines A0–A7 to decode the I/O port address. ...
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... PC, the I/O bus loading should be limited to one Schottky TTL load. Therefore, a buffer/driver should be used when inter- facing more than two AD574As to the I/O bus. 8086 Interface The data mode select pin (12/8) of the AD574A should be con- nected provide a 12-bit data output. To prevent LOGIC possible bus contention, a demultiplexed and buffered address/ data bus is recommended ...
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... AD574A 28-Pin Ceramic DIP Package (D-28) 0.048 (1.21) 0.042 (1.07) 0.458 (11.63) 0.442 (11.23) 0.075 (1.91) REF 0.075 (1.91) REF OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 28-Terminal PLCC Package (P-28A) 0.180 (4.57) 0.165 (4.19) 0.048 (1.21) 0.056 (1.42) 0.042 (1.07) 0.042 (1.07 PIN 1 IDENTIFIER 0.050 TOP VIEW (1.27) (PINS DOWN) BSC ...