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CAT513PITE13 Datasheet(PDF) 7 Page - Catalyst Semiconductor |
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CAT513PITE13 Datasheet(HTML) 7 Page - Catalyst Semiconductor |
7 / 10 page CAT513 7 Advance Information Doc. No. ___________ 3/01 M-1 APPLICATION CIRCUITS Buffered DAC Output Amplified DAC Output this value is the same as that which had been there previously no change in the DAC’s output is noticed. Had the value held in the control register been different from that stored in EEPROM then a change would occur at the read cycle’s conclusion. TEMPORARILY CHANGE OUTPUT The CAT513 allows temporary changes in DAC’s output to be made without disturbing the settings retained in EEPROM memory. This feature is particularly useful when testing for a new output setting and allows for user adjustment of preset or default values without losing the original factory settings. Figure 3 shows the control and data signals needed to effect a temporary output change. DAC settings may be changed as many times as required and can be made to any of the four DACs in any order or sequence. The temporary setting(s) remain in effect long as CS remains high. When CS returns low all four DACs will return to the output values stored in EEPROM memory. When it is desired to save a new setting acquired using Bipolar DAC Output OPT 504 GND VDD V H REF V L REF CONTROL & DATA + – OP 07 VOUT -15V +15V +5V V = V OUT DAC OPT 504 GND VDD V H REF V L REF CONTROL & DATA + – OP 07 VOUT -15V +15V +5V RR i F V = (1 + –––) V OUT DAC RF R I OPT 504 GND VDD V H REF V L REF CONTROL & DATA + – OP 07 V = ( ) -V OUT RF R + i -15V +15V +5V RR i F Ri i RF VDAC For R = i RF V = 2V -V OUT i DAC Vi VOUT MSB LSB 1111 1111 —— (.98 V ) + .01 V = .990 V V = +4.90V 1000 0000 —— (.98 V ) + .01 V = .502 V V = +0.02V 0111 1111 —— (.98 V ) + .01 V = .498 V V = -0.02V 0000 0001 —— (.98 V ) + .01 V = .014 V V = -4.86V 0000 0000 —— (.98 V ) + .01 V = .010 V V = -4.90V REF REF REF IF V = 5V REF 255 255 OUT DAC INPUT DAC OUTPUT ANALOG R = R OUTPUT REF REF REF OUT 128 255 127 255 REF REF REF OUT 1 255 REF REF REF OUT REF REF REF OUT 0 255 V = 0.99 V FS REF V = 0.01 V ZERO REF V = ——— (V - V ) + V DAC CODE 255 FS ZERO ZERO Figure 3. Temporary Change in Output CAT513 CAT513 CAT513 this feature, the new value must be reloaded into the DAC control register prior to programming. This is be- cause the CAT513’s internal control circuitry discards the new data from the programming register two clock cycles after receiving it (after reception is complete) if no PROG signal is received. D0 D1 D2 D3 D4 D5 D6 D7 A0 A1 D0 D1 D2 D3 D4 D5 D6 D7 1 NEW DAC DATA CURRENT DAC DATA DO DI CS PROG DAC OUTPUT t 1 2 3 4 5 6 7 8 9 10 11 12 N N+1 N+2 o CURRENT DAC VALUE NON-VOLATILE NEW DAC VALUE VOLATILE CURRENT DAC VALUE NON-VOLATILE |
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