參數(shù)資料
型號: QADCRM
英文描述: Queued Analog-to-Digital Converter Reference Manual
中文描述: 排隊模擬到數(shù)字轉(zhuǎn)換器參考手冊
文件頁數(shù): 114/122頁
文件大?。?/td> 940K
代理商: QADCRM
MOTOROLA
C-2
CONVERSION ACCURACY DEFINITIONS
For More Information On This Product,
Go to: www.freescale.com
QADC
REFERENCE MANUAL
C.2 Offset Error
The offset error is the DC shift of the entire transfer curve of an ideal converter.
C.3 Quantizing Error
The error in the actual code transition due to finite resolution is called the quantizing
error. The quantizing error is one half LSB.
C.4 Monotonicity
In a monotonic converter, the conversion result only increases as input voltage is in-
creased. Missing or out-of-sequence codes are not allowed, within a single transfer
curve. However, measuring the transfer curve repeatedly might have some variation
due to noise.
Figure C-2
shows the two ways that an A/D converter can be non-mono-
tonic.
Figure C-2 Transfer Curve of a Non-Monotonic 10-Bit A/D Converter
C.5 Gain Error (Slope Error)
Figure C-3
shows that the gain error is an error in the input to output transfer ratio.
Gain error causes an error in the slope of the transfer curve; the average input step
size that causes a code transition is not equal to the desired LSB. In ratiometric con-
verters, like the QADC, the gain is a function of the external reference used.
QADC 10-BIT NONMONO
CODES OUT OF SEQUENCE
0
1BTACCURACY
$000
$001
$002
$003
$004
$005
$3FB
$3FC
$3FD
$3FE
$3FF
1
2
3
4
5
FS–5 FS–4
FS–3
FS–2
FS–1
FS
MISSING
CODE
INPUT VOLTAGE (LSBs)
C
F
Freescale Semiconductor, Inc.
n
.
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