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M37274MA Datasheet(PDF) 32 Page - Mitsubishi Electric Semiconductor |
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M37274MA Datasheet(HTML) 32 Page - Mitsubishi Electric Semiconductor |
32 / 131 page 32 SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER M37274MA-XXXSP PRELIMINARY Notice: This is not a final specification. Some paramentic limits are subject to change. MITSUBISHI MICROCOMPUTERS [ LSB ] [ LSB ] (8) Definition of A-D Conversion Accuracy The definition of A-D conversion accuracy is described below. Relative accuracy • Zero transition error (V0T) The deviation of the input voltage at which A-D conversion output data changes from “0” to “1,” from the corresponding ideal A-D conversion characteristics between 0 and VREF. • Non-linearity error The deviation of the actual A-D conversion characteristics, from the ideal A-D conversion characteristics between V0 and V254. (V0 – 1/2 ! VREF/256) 1LSB V0T = (VREF – 3/2 ! VREF/256) – V254 1LSB VFST= Non-linearity error = [ LSB ] [ LSB ] • Differential non-linearity error The deviation of the input voltage required to change output data by “1,” from the corresponding ideal A-D conversion characteris- tics between 0 and VREF. Absolute accuracy • Absolute accuracy error The deviation of the actual A-D conversion characteristics, from the ideal A-D conversion characteristics between 0 and VREF. Vn – (1LSB ! n+ V0) 1LSB [ LSB] Differential non-linearity error = (Vn+1 –Vn) – 1LSB 1LSB Absolute accuracy error = 1LSBA with respect to absolute accuracy = 1LSB with respect to relative accuracy = Note: The analog input voltage “Vn” at which A-D conversion output data changes from “n” to “n + 1” (n ; 0 to 254) is as follows (refer to Figure 24) : V254 –V0 254 VREF 256 [V ] [V ] Fig. 24. Definition of A-D Conversion Accuracy • Full-scale transition error (VFST) The deviation of the input voltage at which A-D conversion output data changes from “255” to “254,” from the corresponding ideal A- D conversion characteristics between 0 and VREF. Vn – 1LSBA ! (n + 1/2) 1LSBA Output data 0 Analog input voltage (V) V0 Vn Vn+1 V254 VREF n n+1 254 255 Zero transition error (V 0T) Differential non- linearity error LSBA Actual A-D conversion characteristics 1 2 3 2 V1 1LSB A Ideal A-D conversion characteristics between V0 and V254 LSBA 1LSB Absolute accuracy Non-linearity error Full-scale transition error (VFST) 1LSB |
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