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CAT521 Datasheet(PDF) 7 Page - Catalyst Semiconductor |
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CAT521 Datasheet(HTML) 7 Page - Catalyst Semiconductor |
7 / 9 page CAT521 7 Advanced Information 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 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 RDY/BSY setting is reloaded into the DAC control register. Since 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 CAT521 allows temporary changes in the DAC’s output to be made without disturbing the settings re- tained 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. The temporary setting remains in effect long as CS remains high. When CS returns low the DAC will return to the output value stored in EEPROM memory. When it is desired to save a new setting acquired using this feature, the new value must be reloaded into the DAC control register prior to programming. This is be- cause the CAT521’s internal control circuitry discards from the programming register the new data two clock cycles after receiving it if no PROG signal is received. Amplified DAC Output APPLICATION CIRCUITS Bipolar DAC Output OPT 505 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 V OUT CAT521 OPT 505 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 RI CAT521 |
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