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SP574BK Datasheet(PDF) 5 Page - Sipex Corporation |
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SP574BK Datasheet(HTML) 5 Page - Sipex Corporation |
5 / 15 page SP574B/674B/1674B/774B 12–Bit Sampling A/D Converters © Copyright 2000 Sipex Corporation 5 CIRCUIT OPERATION… The SPx74B are complete monolithic capacitor DAC–based 12–bit analog-to-digital convert- ers with integral voltage reference, comparator, successive–approximation register (SAR), sample–and–hold, clock, output buffers and control circuitry. The high level of integration of the SPx74B Series means they require few external components. When the control section of the SPx74B initiates a conversion command, the clock is enabled and the successive–approximation register is reset to all zeros. Once the conversion cycle begins, it can not be stopped or restarted and data is not available from the output buffers. The SAR, timed by the clock, sequences through the conversion cycle and returns an end–of–convert flag to the control sec- tion of the ADC. The clock is then disabled by the control section, the output status goes low, and the control section is enabled to allow the data to be read by external command. The internal SPx74B 12–bit CDAC is sequenced by the SAR starting from the MSB to the LSB at the beginning of the conversion cycle to provide an output voltage from the CDAC that is equal to the input signal voltage (which is divided by the input voltage divider network). The com- parator determines whether the addition of each successively–weighted bit voltage causes the CDAC output voltage summation to be greater or less than the input voltage; if the sum is less, the bit is left on; if more, the bit is turned off. After testing all the bits, the SAR contains a 12– bit binary code which accurately represents the input signal to within ±1⁄ 2 LSB. The internal reference provides the voltage refer- ence to the CDAC with excellent stability over temperature and time. The reference is trimmed to 10.00 Volts ±1% and can supply up to 2mA to an external load in addition to that required to drive the reference input resistor (1mA) and offset resistor (1mA) when operating with ±15V supplies. If the SPx74B is used with ±12V supplies, or if external current must be supplied over the full temperature range, an external buffer amplifier is recommended. Any external load on the SPx74B reference must remain constant during conversion. FEATURES… The SPx74B Series feature standard bipolar and unipolar input ranges of 10V and 20V. Input ranges are controlled by a bipolar offset pin and laser-trimmed for specified linearity, gain and offset accuracy. Power requirements are +5V and +12V to +15V with a maximum dissipation of 150mW at the specified voltages. Conversion times of 8 µs, 10µs, 15µs and 25µs are available, as are units with 10, 25 or 50ppm/ °C tempera- ture coefficients for flexible matching to spe- cific application requirements. The SPx74B Series are available in nine prod- uct grades for each conversion time. The –J and –K models are specified over 0˚C to + 70˚C commercial temperature range; the –A and –B models are specified over the –40˚C to +85˚C industrial temperature range; the –S and –T models are specified over the –55˚C to +125˚C military temperature range. Package options include 28–pin CDIP, 28–pin plastic DIP (both narrow and wide), 28-pin PLCC and 28–pin SOIC. PIN ASSIGNMENTS… PIN FUNCTION PIN FUNCTION 1V LOGIC 28 STS 2 12/8 27 DB 11(MSB) 3CS 26 DB 10 4A 0 25 DB 9 5 R/C 24 DB 8 6CE 23 DB 7 7V CC 22 DB 6 8 REF OUT 21 DB 5 9 ANA GND(AC) 20 DB 4 10 REF IN 19 DB 3 11 N/C* 18 DB 2 12 BIP OFF 17 DB 1 13 10V IN 16 DB 0(LSB) 14 20V IN 15 DIG. GND *This pin is not connected inside the device so it can be tied to –15V, ground, or left floating. |
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