參數(shù)資料
型號(hào): LTC1458LISW#TR
廠商: Linear Technology
文件頁數(shù): 12/12頁
文件大?。?/td> 0K
描述: IC DAC 12BIT R-R 3V QUAD 28SOIC
標(biāo)準(zhǔn)包裝: 1,000
設(shè)置時(shí)間: 14µs
位數(shù): 12
數(shù)據(jù)接口: 串行
轉(zhuǎn)換器數(shù)目: 4
電壓電源: 單電源
功率耗散(最大): 2.4mW
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 28-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 28-SOIC
包裝: 帶卷 (TR)
輸出數(shù)目和類型: 4 電壓,單極
采樣率(每秒): *
9
LTC1458/LTC1458L
Using Two DACs to Digitally Program the Full Scale
and Offset of a Third
Figure 2 shows how to use one LTC1458 to make a 12-bit
DAC with a digitally programmable full scale and offset.
DAC A and DAC B are used to control the offset and full
scale of DAC C. DAC A is connected in a
×1 configuration
and controls the offset of DAC C by moving REFLO C above
ground. The minimum value to which this offset can be
programmed is 10mV. DAC B is connected in a
× 2
configuration and controls the full scale of DAC C by
driving REFHI C. Note that the voltage at REFHI C must be
less than or equal to VCC/2, corresponding to DAC B’s code
≤ 2,500 for VCC = 5V, since DAC C is being operated in × 2
mode for full rail-to-rail output swing.
The transfer characteristic is:
VOUTC = 2 [DC (2 DB – DA) + DA] REFOUT
where REFOUT = The Reference Output
DA = (DAC A Digital Code)/4096
This sets the offset.
DB = (DAC B Digital Code)/4096
This sets the full scale.
DC = (DAC C Digital Code)/4096
VCC
X1/X2 B
VOUT B
CLR
REFHI B
GND
REFLO B
REFLO A
REFHI A
REFOUT
NC
VOUT A
X1/X2 A
VCC
X1/X2 C
VOUT C
CS/LD
DIN
REFHI C
GND
REFLO C
REFLO D
REFHI D
DOUT
CLK
NC
VOUT D
X1/X2 D
LTC1458
LTC1458L
0.1
F
VOUT
5V
1458 F02
500
Figure 2
APPLICATIO S I FOR ATIO
WU
UU
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