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LTC2420C Datasheet(PDF) 7 Page - Linear Technology |
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LTC2420C Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LTC2420 APPLICATIO S I FOR ATIO Figure 2. Output Data Timing Table 2. LTC2420 Output Data Format Bit 23 Bit 22 Bit 21 Bit 20 Bit 19 Bit 18 Bit 17 Bit 16 Bit 15 … Bit 0 Input Voltage EOC DMY SIG EXR MSB LSB VIN > 9/8 • VREF 0 0 1100 0 11... 1 9/8 • VREF 0 0 1100 0 11... 1 VREF + 1LSB 0 0 1100 0 00... 0 VREF 0 0 1011 1 11... 1 3/4VREF + 1LSB 0 0 1011 0 00... 0 3/4VREF 0 0 1010 1 11... 1 1/2VREF + 1LSB 0 0 1010 0 00... 0 1/2VREF 0 0 1001 1 11... 1 1/4VREF + 1LSB 0 0 1001 0 00... 0 1/4VREF 0 0 1000 1 11... 1 0+/0– 0 0 1/0* 000 0 00... 0 –1LSB 0 0 0111 1 11... 1 –1/8 • VREF 0 0 0111 1 00... 0 VIN < –1/8 • VREF 0 0 0111 1 00... 0 *The sign bit changes state during the 0 code. MSB EXT SIG “0” 1 2 3 4 5 192024 BIT 0 BIT 19 BIT 4 LSB20 BIT 20 BIT 21 BIT 22 SDO SCK CS EOC BIT 23 SLEEP DATA OUTPUT CONVERSION 2420 F02 Hi-Z Figure 3. Selectable 100 Samples/Second Turbo Mode Figure 4. Total Error vs Output Rate (VREF = 5V) FO SCK SDO CS VCC VREF VIN GND 8 7 6 5 1 2 3 4 LTC2420 800Hz NOTCH (100 SAMPLES/SECOND) 60Hz NOTCH (7.5 SAMPLES/SECOND) EXTERNAL 2.048MHz CLOCK SOURCE INTERNAL 153.6kHz OSCILLATOR 2420 F03 OUTPUT RATE (SAMPLES/SEC) 0 96 128 160 12 BITS 13 BITS 14 BITS 16 BITS 2420 F04 64 32 0 50 100 192 224 256 VREF = 5V 150 |
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