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LTC1402IGN 数据表(PDF) 14 Page - Linear Technology |
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LTC1402IGN 数据表(HTML) 14 Page - Linear Technology |
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14 / 24 page  14 LTC1402 Adjustment in Bipolar Mode with Pin 8 Held High The code transitions occur midway between successive integer LSB values (i.e., – FS + 0.5LSB, – FS + 1.5LSB, – FS + 2.5LSB,...FS – 2.5LSB, FS – 1.5LSB). The output at DOUT is two’s complement binary with 1LSB = FS – (– FS)/4096 = 4.096V/4096 = 1.0mV. 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. In Figure 10b, zero offset is achieved by adjusting the offset applied to the AIN– input. For zero offset error, apply – 0.5mV (i.e., – 0.5LSB) to AIN+ and adjust the offset at the AIN– input using R8 until the output code flickers between 0000 0000 0000 and 1111 1111 1111. For full-scale adjustment in Figures 10a and 10b, apply an input voltage of 2.0465V (FS – 1.5LSB) to AIN+ and adjust R5 until the output code flickers between 0111 1111 1110 and 0111 1111 1111. APPLICATIONS INFORMATION more than 0.25 inch long to the common reference. You may also choose to tie AGND2 (Pin 6) directly to a solid analog ground plane and eliminate all the 10 µF capacitors at this pin. The external reference source needs to have enough output drive current for the 2k Ω load at each ADC. FULL-SCALE AND OFFSET ADJUSTMENT Figure 9 shows the ideal input/output characteristics for the LTC1402 in bipolar mode and unipolar mode. Figure 10a shows the components required for full-scale error adjustment. Figure 10b includes the components for off- set and full-scale adjustment. Figure 9. LTC1402 Transfer Characteristic Figure 10a. Full-Scale Adjustment Circuit with ±10LSB Range Figure 10b. Offset and Full-Scale Adjustment Circuits with ±10LSB Range Adjustment in Unipolar Mode with Pin 8 Held Low The code transitions occur midway between successive integer LSB values (i.e., – FS + 0.5LSB, – FS + 1.5LSB, – FS + 2.5LSB,...FS – 2.5LSB, FS – 1.5LSB). The output at DOUT is binary with 1LSB = FS/4096 = 4.096V/4096 = 1.0mV. In applications where absolute accuracy is impor- tant, offset and full-scale errors can be adjusted to zero. Offset error must be adjusted before full-scale error. In Figure 10b, zero offset is achieved by adjusting the offset applied to the AIN– input. For zero offset error apply – 0.5mV (i.e., – 0.5LSB) to AIN+ and adjust the offset at the AIN– input using R8 until the output code flickers between INPUT VOLTAGE (V) 1402 F09 011...111 011...110 011...101 100...000 100...001 100...010 111...111 111...110 111...101 000...000 000...001 000...010 FS – 1LSB – (FS – 1LSB) 64k R1 51 Ω R3 51 Ω 64k REFERENCE AMP S/H 10 µF R4 470k R2 24k R7 7.5k R5 500 Ω GAIN VREF 5 5V 5V ANALOG INPUT 0V TO 4.096V OR ±2.048V OFFSET ADJ FULL-SCALE ADJ 7 AIN – 4 AIN + 3 AGND2 6 LTC1402 2.048V 1402 F010b R8 10k R6 24k BANGAP REFERENCE 64k R1 51 Ω R3 51 Ω 64k 10 µF R4 470k R2 39k R5 500 Ω GAIN VREF 5 ANALOG INPUT 0V TO 4.096V OR ±2.048V 7 AIN – 4 AIN + 3 AGND2 6 LTC1402 2.048V 1402 F010a BANGAP REFERENCE REFERENCE AMP S/H |
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