參數(shù)資料
型號(hào)： LTC1657LIN
廠商： LINEAR TECHNOLOGY CORP
元件分類： DAC
英文描述： Parallel 16-Bit Rail-to-Rail Micropower DAC
中文描述： PARALLEL, WORD INPUT LOADING, 20 us SETTLING TIME, 16-BIT DAC, PDIP28
封裝： 0.300 INCH, PLASTIC, DIP-28
文件頁數(shù)： 6/12頁
文件大?。?/td> 157K
代理商： LTC1657LIN
6
LTC1657L
Figure 1. Effect of Negative Offset
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:
LTC1657L LSB = 2.5V/65535 = 38.1
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)
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.
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