參數(shù)資料
型號: LTC1665IN#PBF
廠商: Linear Technology
文件頁數(shù): 3/18頁
文件大?。?/td> 0K
描述: IC D/A CONV 8BIT OCTAL 16-DIP
標(biāo)準(zhǔn)包裝: 25
設(shè)置時間: 30µs
位數(shù): 8
數(shù)據(jù)接口: 串行
轉(zhuǎn)換器數(shù)目: 8
電壓電源: 單電源
功率耗散(最大): 1mW
工作溫度: -40°C ~ 85°C
安裝類型: 通孔
封裝/外殼: 16-DIP(0.300",7.62mm)
供應(yīng)商設(shè)備封裝: 16-PDIP
包裝: 管件
輸出數(shù)目和類型: 8 電壓,單極;8 電壓,雙極
采樣率(每秒): *
LTC1665/LTC1660
11
166560fa
OPERATION
Table 2. DAC Address/Control Functions
ADDRESS/CONTROL
DAC STATUS
SLEEP STATUS
A3
A2
A1
A0
0
No Change
Wake
0
1
Load DAC A
Wake
0
1
0
Load DAC B
Wake
0011
Load DAC C
Wake
0100
Load DAC D
Wake
0101
Load DAC E
Wake
0110
Load DAC F
Wake
0111
Load DAC G
Wake
1000
Load DAC H
Wake
1001
No Change
Wake
1010
No Change
Wake
1011
No Change
Wake
1100
No Change
Wake
1101
No Change
Wake
1110
No Change
Sleep
1111
Load ALL DACs
with Same
8/10-Bit Code
Wake
Sleep mode is initiated by performing a load sequence
to address 1110b (the DAC input word D7-D0 [D9-D0]
is ignored). Once in Sleep mode, a load sequence to any
other address (including “No Change” addresses 0000b
and 1001-1101b) causes the LTC1665/LTC1660 to Wake.
It is possible to keep one or more chips of a daisy chain
in continuous Sleep mode by giving the Sleep instruction
to these chips each time the active chips in the chain are
updated.
Voltage Outputs
Each of the eight rail-to-rail output amplifiers contained
in these parts can source or sink up to 5mA. The outputs
swing to within a few millivolts of either supply rail when
unloaded and have an equivalent output resistance of 85Ω
when driving a load to the rails. The output amplifiers are
stable driving capacitive loads up to 1000pF.
A small resistor placed in series with the output can be
used to achieve stability for any load capacitance. A 1μF
load can be successfully driven by inserting a 20Ω resis-
tor; a 2.2μF load needs only a 10Ω resistor. In either case,
larger values of resistance, capacitance or both may be
safely substituted for the values given.
Rail-to-Rail Output Considerations
In any rail-to-rail output voltage DAC, the output is limited
to voltages within the supply range.
If the DAC offset is negative, the output for the lowest
codes limits at 0V as shown in Figure 3b.
Similarly, limiting can occur near full scale when the REF
pin is tied to VCC. If VREF = VCC and the DAC full-scale error
(FSE) is positive, the output for the highest codes limits
at VCC as shown in Figure 3c. No full-scale limiting can
occur if VREF is less than VCC – FSE.
Offset and linearity are defined and tested over the region
of the DAC transfer function where no output limiting
can occur.
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