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參數(shù)資料
| 型號(hào)： | LTC1458C |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual General Purpose LinCMOS(TM) Differential Comparator 8-SOIC 0 to 70 |
| 中文描述： | 四路12位軌至軌微數(shù)模轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 248K |
| 代理商： | LTC1458C |
8
LTC1458/LTC1458L
OPERATIOU
Serial Interface
The data on the D
IN
input is loaded into the shift register
on the rising edge of the clock. Data is loaded as one 48-bit
word, DAC A first, then DAC B, DAC C and DAC D. The MSB
is loaded first for each DAC. The DAC registers load the
data from the shift register when CS/LD is pulled high. The
CLK is disabled internally when CS/LD is high. Note: CLK
must be low before CS/LD is pulled low to avoid an extra
internal clock pulse.
The buffered output of the 48-bit shift register is available
on the D
OUT
pin which swings from ground to V
CC
.
Multiple LTC1458/LTC1458Ls may be daisy-chained to-
gether by connecting the D
OUT
pin to the D
IN
pin of the next
chip, while the CLK and CS/LD signals remain common to
all chips in the daisy-chain. The serial data is clocked to all
of the chips, then the CS/LD signal is pulled high to update
all of them simultaneously.
Reference
The LTC1458L has an internal reference of 1.22V with a
full scale of 2.5V (gain of 2 configuration). The LTC1458
includes an internal 2.048V reference, making 1LSB equal
to 1mV (gain of 2 configuration). When the buffer gain is
2, the external reference must be less than V
CC
/2 and be
capable of driving the 15k minimum DAC resistor ladder.
The external reference must always be less than
V
CC
– 1.5V.
Voltage Output
The rail-to-rail buffered output of the LTC1458 family can
source or sink 5mA when operating with a 5V supply over
the entire operating temperature range while pulling to
within 300mV of the positive supply voltage or ground.
The output swings to within a few millivolts of either
supply rail when unloaded and has an equivalent output
resistance of 40
when driving a load to the rails. The
output can drive 1000pF without going into oscillation.
DEFU
U
Differential Nonlinearity (DNL):
DNL is the difference
between the measured change and the ideal 1LSB 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)(sec).
相關(guān)PDF資料 |
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|---|---|
| LTC1458CG | Quad 12-Bit Rail-to-Rail Micropower DACs |
| LTC1458CSW | Dual General Purpose LinCMOS(TM) Differential Comparator 8-SOIC 0 to 70 |
| LTC1458I | Quad 12-Bit Rail-to-Rail Micropower DACs |
| LTC1458L | Dual General Purpose LinCMOS(TM) Differential Comparator 8-PDIP 0 to 70 |
| LTC1458LC | Quad 12-Bit Rail-to-Rail Micropower DACs |
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