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LTC1273ACSW 数据表(PDF) 13 Page - Linear Technology |
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LTC1273ACSW 数据表(HTML) 13 Page - Linear Technology |
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13 / 24 page  13 LTC1273 LTC1275/LTC1276 127356fa S APPLICATI I FOR ATIO reference pin. The VREF pin must be driven to at least 2.45V to prevent conflict with the internal reference. The reference should be driven to no more than 4.8V to keep the input span within the ±5V supplies. In the LTC1273/ LT1276, the input spans are 0V to 5V and ±5V respec- tively with the internal reference. Driving the reference is not recommended on the LTC1273/LTC1276 since the input spans will exceed the supplies and codes will be lost at full scale. Figure 7 shows a typical reference, the LT1019A-2.5 connected to the LTC1275. This will provide an improved drift (equal to the maximum 5ppm/ °C of the LT1019A-2.5) and a ±2.582V full scale. Figure 8. LTC1273 Unipolar Transfer Characteristic INPUT VOLTAGE (V) 0V FS – 1LSB LTC1273/75/76 • F08 111...111 111...110 111...101 111...100 000...000 000...001 000...010 000...011 1 LSB 1LSB = FS 4096 = 5V 4096 UNIPOLAR ZERO Figure 9. LTC1275/LTC1276 Bipolar Transfer Characteristic LTC1273 LTC1275 LTC1276 AIN AGND LTC1273/75/76 • F10a R4 100 Ω FULL SCALE ADJUST R3 10k R2 10k R1 50 Ω V1 – + A1 ADDITIONAL PINS OMITTED FOR CLARITY ±20LSB TRIM RANGE Figure 10a. Full Scale Adjust Circuit Figure 7. Supplying a 2.5V Reference Voltage to the LTC1275 with the LT1019A-2.5 3 Ω INPUT RANGE ±2.58V LTC1275 AIN AGND VREF 10 µF LTC1273/75/76 • F07 LT1019A-2.5 VIN GND VOUT 5V UNIPOLAR/BIPOLAR OPERATION AND ADJUSTMENT Figure 8 shows the ideal input/output characteristics for the LTC1273. The code transitions occur midway between successive integer LSB values (i.e., 1/2LSB, 1 1/2LSBs, 2 1/2LSBs, ... FS – 1 1/2LSBs). The output code is natural binary with 1LSB = FS/4096 = 5V/4096 = 1.22mV. Figure 9 shows the input/output transfer characteristics for the LTC1275/LTC1276 in 2’s complement format. As stated in the figure, 1LSB for LTC1275/LTC1276 are 1.22mV and 2.44mV respectively. Unipolar Offset and Full Scale Adjustment (LTC1273) In applications where absolute accuracy is important, offset and full scale errors can be adjusted to zero. Figure 10a shows the extra components required for full scale error adjustment. If both offset and full scale adjustments are needed, the circuit in Figure 10b can be used. Offset INPUT VOLTAGE (V) 0V –1 LSB LTC1273/75/76 • F09 011...111 011...110 000...001 000...000 100...000 100...001 111...110 1 LSB BIPOLAR ZERO 111...111 111...110 FS/2 – 1LSB –FS/2 FS = 5V (LTC1275) FS = 10V (LTC1276) 1LSB = FS/4096 |
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