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參數(shù)資料
| 型號： | LTC1657I |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Low-Power Dual LinCMOS<TM> Timer 14-CDIP -55 to 125 |
| 中文描述： | 并行16位軌到軌微援 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 194K |
| 代理商： | LTC1657I |
7
LTC1657
Figure 1. Effect of Negative Offset
Zero-Scale Error (ZSE):
The output voltage when the
DAC is loaded with all zeros. Since this is a single supply
part, this value cannot be less than 0V.
Integral Nonlinearity (INL):
End-point INL is the maxi-
mum deviation from a straight line passing through the
end points of the DAC transfer curve. Because the part
operates from a single supply and the output cannot go
below zero, the linearity is measured between full scale
and the code corresponding to the maximum offset
specification. The INL error at a given input code is
calculated as follows:
INL (In LSBs) = [V
OUT
– V
OS
– (V
FS
– V
OS
)
(code/65535)]
V
OUT
= The output voltage of the DAC measured at
the given input code
Differential Nonlinearity (DNL):
DNL is the difference
between the measured change and the ideal one LSB
change between any two adjacent codes. The DNL error
between any two codes is calculated as follows:
DNL = (
V
OUT
– LSB)/LSB
V
OUT
= The measured voltage difference between
two adjacent codes
Digital Feedthrough:
The glitch that appears at the analog
output caused by AC coupling from the digital inputs when
they change state. The area of the glitch is specified in
nV s.
Resolution (n):
Resolution is defined as the number of
digital input bits (n). It defines the number of DAC output
states (2
n
) that divide the full-scale range. Resolution does
not imply linearity.
Full-Scale Voltage (V
FS
):
This is the output of the DAC
when all bits are set to 1.
Voltage Offset Error (V
OS
):
Normally, the DAC offset is the
voltage at the output when the DAC is loaded with all zeros.
The DAC can have a true negative offset, but because the
part is operated from a single supply, the output cannot go
below zero. If the offset is negative, the output will remain
near 0V resulting in the transfer curve shown in Figure 1.
DEFU
U
DAC CODE
1657 F01
OUTPUT
VOLTAGE
NEGATIVE
OFFSET
0V
The offset of the part is measured at the code that corre-
sponds to the maximum offset specification:
V
OS
= V
OUT
– [(Code)(V
FS
)/(2
n
– 1)]
Least Significant Bit (LSB):
One LSB is the ideal voltage
difference between two successive codes.
LSB = (V
FS
– V
OS
)/(2
n
– 1) = (V
FS
– V
OS
)/65535
Nominal LSBs:
LTC1657 LSB = 4.096V/65535 = 62.5
μ
V
DAC Transfer Characteristic:
V
G
REFHI REFLO
–
65536
CODE
REFLO
OUT
=
(
)
+
G = 1 for X1/X2 connected to V
OUT
G = 2 for X1/X2 connected to GND
CODE = Decimal equivalent of digital input
(0
≤
CODE
≤
65535)
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