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LTC1821BIGW Datasheet(PDF) 4 Page - Linear Technology |
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LTC1821BIGW Datasheet(HTML) 4 Page - Linear Technology |
4 / 16 page 4 LTC1821 Note 8: To 0.0015% for a full-scale change, measured from the rising edge of LD. Note 9: REF = 0V. DAC register contents changed from all 0s to all 1s or all 1s to all 0s. LD low and WR high. Note 10: Midscale transition code: 0111 1111 1111 1111 to 1000 0000 0000 0000. Unipolar mode, CFEEDBACK = 33pF. Note 11: R1 and R2 are measured between R1 and RCOM, REF and RCOM. Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: ±1LSB = ±0.0015% of full scale = ±15.3ppm of full scale. Note 3: Using internal feedback resistor. Note 4: Guaranteed by design, not subject to test. Note 5: IOUT with DAC register loaded to all 0s. Note 6: Typical temperature coefficient is 100ppm/ °C. Note 7: Measured in unipolar mode. ELECTRICAL CHARACTERISTICS TYPICAL PERFOR A CE CHARACTERISTICS TIME ( µs) 0 –10 0 10 0.6 1.0 1821 G01 –20 –30 –40 0.2 0.4 0.8 20 30 40 CFEEDBACK = 30pF VREF = 10V 1nV-s TYPICAL FREQUENCY (Hz) –90 –70 –50 –40 10 1k 10k 100k 1821 G03 –110 100 –60 –80 –100 VCC = 5V CFEEDBACK = 30pF REFERENCE = 6VRMS 500kHz FILTER 80kHz FILTER 30kHz FILTER LD PULSE 5V/DIV GATED SETTLING WAVEFORM 500 µV/DIV 500ns/DIV 1821 G02 VREF = –10V CFEEDBACK = 20pF 0V TO 10V STEP FREQUENCY (Hz) –90 –70 –50 –40 10 1k 10k 100k 1821 G04 –110 100 –60 –80 –100 VCC = 5V USING AN LT1468 CFEEDBACK = 15pF REFERENCE = 6VRMS 500kHz FILTER 80kHz FILTER 30kHz FILTER FREQUENCY (Hz) –90 –70 –50 –40 10 1k 10k 100k 1821 G05 –110 100 –60 –80 –100 VCC = 5V USING AN LT1468 CFEEDBACK = 15pF REFERENCE = 6VRMS 500kHz FILTER 80kHz FILTER 30kHz FILTER INTPUT VOLTAGE (V) 0 3 4 5 4 1821 G06 2 1 0 1 2 3 5 VCC = 5V ALL DIGITAL INPUTS TIED TOGETHER Midscale Glitch Impulse Unipolar Multiplying Mode Signal-to-(Noise + Distortion) vs Frequency Full-Scale Setting Waveform Bipolar Multiplying Mode Signal-to-(Noise + Distortion) vs Frequency, Code = All Zeros Bipolar Multiplying Mode Signal-to-(Noise + Distortion) vs Frequency, Code = All Ones VCC Supply Current vs Digital Input Voltage |
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