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SP9840BS Datasheet(PDF) 6 Page - Sipex Corporation |
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SP9840BS Datasheet(HTML) 6 Page - Sipex Corporation |
6 / 10 page 262 LAST D0 LSB DATA ADDRESS D1 D2 D3 D4 D5 D6 D7 MSB D7 D6 D5 D4 D3 D2 D1 D0 DAC Output Voltage VOUT = –2VREFL A0 LSB A1 A2 A3 MSB A3 A2 A1 A0 DAC Updated FIRST 0 0 0 0 0 0 0 0 1 1 . . 1 0 0 0 1 1 1 1 0 0 1 0 0 1 1 0 0 1 0 0 1 1 0 0 1 0 0 1 1 0 0 1 0 0 . . . 1 1 0 0 1 0 0 1 1 0 0 1 0 0 1 1 0 1 1 0 1 0 1 0 0 0 0 1 1 1 1 0 0 . . 1 0 0 1 1 0 0 1 1 0 0 . . 1 0 1 0 1 0 1 0 1 0 1 . . 1 No Operation DACA DACB DACC DACD DACE DACF DACG DACH No Operation . . No operation . . . D VV V IN REFL REF 128 1 − ∗− () + Table 1. Serial Input Decoded Truth Table In reality, it is possible to define a DC voltage as a signal ground in a single supply system. If the DAC's V REFL pin is driven to the voltage chosen as pseudo– ground, then each voltage output will exhibit 4– quadrant behavior with respect to pseudoground. For codes greater than 128, the output voltage will enter the quadrant below the pseudoground voltage when the input voltage goes below pseudoground. For codes less than 128, the output voltage will be below pseudogroundwhentheinputisabovepseudoground. When V REFL is driven to some positive voltage and V IN(X) is grounded, the device performs as if it were a buffered trimpot tied between ground and a voltage equal to two times V REFL. This mode of operation can be used as an "inverted single– quadrant" source with an approximate range of 0 to (V REFL*2)Volts. Because the output voltage will decrease as the code is increased, this mode is considered to be inverted with respect to normal single–quadrant operation. Note that the mini- mum output voltage will be 1LSB above V IN(X). Figure 2a and 2b show "inverted single–quadrant" and 4–quadrant performance of the SP9840/9843. very precise when describing a system which runs fromasinglepositivesupply.Traditionally,thequad- rants have been defined with respect to 0V. A two– quadrant multiplying DAC could produce negative output voltages only if a negative voltage reference were applied. A four–quadrant device could also produce a code–controlled negative output from a positive reference, or a code–controlled positive out- put from a negative reference. If ground is used to delineate the quadrants, then the SP9840/SP9843 should be considered single–quadrant multiplying devices, as their output op amps cannot produce voltages below ground. – + DAC 3 V REFL +5V V DD V IN(X) V OUT V D VV V OUT IN REFL REFL =− − + () 128 1 Figure 1. DAC and Output Amplifier Circuit |
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