전자부품 데이터시트 검색엔진 |
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AD8383 데이터시트(PDF) 8 Page - Analog Devices |
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AD8383 데이터시트(HTML) 8 Page - Analog Devices |
8 / 16 page AD8383 Rev. 0 | Page 8 of 16 THEORY OF OPERATION TRANSFER FUNCTION AND ANALOG OUTPUT VOLTAGE The DecDriver has two regions of operation: where the video output voltages are either above or below a reference voltage VMID, and where VMID = (V1 + V2)/2. The transfer function defines the analog output voltage as the function of the digital input code as follows: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × = 1023 – 1 ) ( n FS V – V1 n VIDx for INV = LOW ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × + = 1023 – 1 ) ( n VFS 2 V n VIDx for INV = HIGH where n = input code VFS = 2 × (VREFHI – VREFLO) A number of internal limits define the usable range of the analog output voltages, VIDx, as shown in Figure 5. To best correlate transfer function errors to image artifacts, the overall accuracy of the DecDriver is defined by two parameters, VDE and VCME. VDE, the differential error voltage, measures the difference between the rms value of the output and the rms value of the ideal. The defining expression is [ ][ ] VFS n 1 V n VOUTP 2 V n VOUTN n VDE × ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − − − − − = 1023 1 2 ) ( ) ( ) ( VCME, the common-mode error voltage, measures ½ the dc bias of the output. The defining expression is () ⎥⎦ ⎤ ⎢⎣ ⎡ + + = 2 – ) ( ) ( 2 1 2 1 ) ( 2 V 1 V n VOUTP n VOUTN n VCME INPUT CODE AGND V1 – VFS V1 V2 VMID V2 + VFS AVCC 0 1023 0 ≤ V FS ≤ 5.5V 0 ≤ V FS ≤ 5.5V 5V ≤ V2 ≤ (AVCC – 4) VMID = (V1+V2)/2 2VREFHI–VREFLO 5V ≤ V1 ≤ (AVCC – 4) 9V ≤ AVCC ≤ 18V ≥ 1.3V ≥ 1.3V INV = HIGH INV = LOW INTERNAL LIMITS AND USABLE VOLTAGE RANGES Figure 5. Transfer Function, VIDx vs. Input Code, Internal Limits and Usable Output Voltage Range |
유사한 부품 번호 - AD8383_15 |
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유사한 설명 - AD8383_15 |
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