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| 型號(hào)： | QADCRM |
| 英文描述： | Queued Analog-to-Digital Converter Reference Manual |
| 中文描述： | 排隊(duì)模擬到數(shù)字轉(zhuǎn)換器參考手冊(cè) |
| 文件頁(yè)數(shù)： | 113/122頁(yè) |
| 文件大小： | 940K |
| 代理商： | QADCRM |
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QADC
REFERENCE MANUAL
CONVERSION ACCURACY DEFINITIONS
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
C-1
APPENDIX C CONVERSION ACCURACY DEFINITIONS
This section explains the terminology used to specify the analog characteristics of the
QADC.
C.1 Transfer Curve
Figure C-1
is a plot of the conversion result versus the absolute input voltage. The ide-
al curve can be thought of as a staircase of uniform step size with perfect positioning
of the endpoints (without gain or offset errors).
Figure C-1 Transfer Curve of an Ideal 10-Bit A/D Converter
The ideal transfer curve has the midpoint code of $000 at the origin, so that the tran-
sition of the conversion result from $000 to $001 occurs for an input of one half LSB.
Since the input range spans the 1024 codes from $000 to $3FF, the full scale result of
$3FF is centered at one least significant (LSB) below the full scale input for an ideal
converter.
For example, a 10-bit converter with a reference voltage of 5.12 V (a binary multiple)
has an LSB of exactly 5 mV; there are 1024 values from $000 to $3FF. For an ideal
converter, the first transition (from $000 to $001) occurs at 2.5 mV, and the last tran-
sition (from $3FE to $3FF) occurs at 5.1125 V, or one and one half LSBs before full
scale.
QADC 10-BIT IDEAL
0
INPUT VOLTAGE (LSBs)
1BTACCURACY
C
$000
$001
$002
$003
$004
$005
$3FB
$3FC
$3FD
$3FE
$3FF
OFFSET
QUANTIZATION ERROR
OFFSET
1
2
3
4
5
FS–3 FS–4
FS–3
FS–2
FS–1
FS
F
Freescale Semiconductor, Inc.
n
.
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