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LTC1418AIN Datasheet(PDF) 13 Page - Linear Technology |
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LTC1418AIN Datasheet(HTML) 13 Page - Linear Technology |
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13 / 28 page  13 LTC1418 APPLICATIONS INFORMATION Figure 9a. LTC1418 Unipolar Transfer Characteristics ANALOG INPUT 1418 F10a 5V R4 100 Ω R2 50k R3 24k R7 48k R6 24k R1 50k R5 47k 0.1 µF 10 µF R8 100 Ω 1 2 3 4 5 LTC1418 AIN + AIN – VREF REFCOMP AGND V SS VDD Figure 10a. Offset and Full-Scale Adjust Circuit If – 5V Is Not Available UNIPOLAR / BIPOLAR OPERATION AND ADJUSTMENT Figure 9a shows the ideal input/output characteristics for the LTC1418. The code transitions occur midway between successive integer LSB values (i.e., 0.5LSB, 1.5LSB, 2.5LSB, … FS – 1.5LSB). The output code is natural binary with 1LSB = FS/16384 = 4.096V/16384 = 250 µV.Figure9b shows the input/output transfer characteristics for the bipolar mode in two’s complement format. Unipolar Offset and Full-Scale Error Adjustment In applications where absolute accuracy is important, offset and full-scale errors can be adjusted to zero. Offset error must be adjusted before full-scale error. Figures 10a and 10b show the extra components required for full- scale error adjustment. Zero offset is achieved by adjust- ing the offset applied to the AIN– input. For zero offset error apply 125 µV (i.e., 0.5LSB) at the input and adjust the offset at the AIN– input until the output code flickers between 0000 0000 0000 00 and 0000 0000 0000 01. For full-scale adjustment, an input voltage of 4.095625V (FS – 1.5LSBs) is applied to AIN+ and R2 is adjusted until the output code flickers between 1111 1111 1111 10 and 1111 1111 1111 11. Bipolar Offset and Full-Scale Error Adjustment Bipolar offset and full-scale errors are adjusted in a similar fashion to the unipolar case. Again, bipolar offset error must be adjusted before full-scale error. Bipolar offset Figure 9b. LTC1418 Bipolar Transfer Characteristics Figure 10b. Offset and Full-Scale Adjust Circuit If – 5V Is Available INPUT VOLTAGE (V) 0V –1 LSB 1418 F9b 011...111 011...110 000...001 000...000 100...000 100...001 111...110 1 LSB BIPOLAR ZERO 111...111 FS/2 – 1LSB –FS/2 FS = 4.096V 1LSB = FS/16384 ANALOG INPUT 1418 F10b 5V –5V –5V 1N5817 R4 100 Ω R2 50k R3 24k R6 24k R1 50k R5 47k 0.1 µF * *ONLY NEEDED IF VSS GOES ABOVE GROUND 10 µF 1 2 3 4 5 LTC1418 AIN + AIN – VREF REFCOMP AGND V SS VDD INPUT VOLTAGE (V) 0V FS – 1LSB 1418 F9a 111...111 111...110 111...101 111...100 000...000 000...001 000...010 000...011 1 LSB UNIPOLAR ZERO 1LSB = FS 16384 4.096V 16384 = |
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