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參數(shù)資料
| 型號： | LTC263ACSC6-HZ12#TRMPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 4.8 us SETTLING TIME, 12-BIT DAC, PDSO6 |
| 封裝： | LEAD FREE, PLASTIC, MO-203AB, SC-70, 6 PIN |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 341K |
| 代理商： | LTC263ACSC6-HZ12#TRMPBF |
LTC2630
13
2630f
TIMING DIAGRAM
The LTC2630 is a family of single voltage output DACs in
6-lead SC70 packages. Each DAC can operate rail-to-rail
referenced to the input supply, or with its full-scale volt-
age set by an integrated reference. Twelve combinations
of accuracy (12-, 10-, and 8-bit), power-on reset value
(zero or midscale), and full-scale voltage (2.5V or 4.096V)
are available. The LTC2630 is controlled using a 3-wire
SPI/MICROWIRE compatible interface.
Power-On Reset
The LTC2630-HZ/-LZ clear the output to zero scale when
power is rst applied, making system initialization con-
sistent and repeatable.
For some applications, downstream circuits are active
during DAC power-up, and may be sensitive to nonzero
outputs from the DAC during this time. The LTC2630
contains circuitry to reduce the power-on glitch: the
analog output typically rises less than 5mV above zero
scale during power on if the power supply is ramped
to 5V in 1ms or more. In general, the glitch amplitude
decreases as the power supply ramp time is increased.
See “Power-On Reset Glitch” in the Typical Performance
Characteristics section.
The LTC2630-HM/-LM provide an alternative reset, setting
the output to midscale when power is rst applied.
SDI
CS/LD
SCK
t2
t10
t5
t7
t6
t1
t3
t4
12
3
23
24
2630 F01
OPERATION
Transfer Function
The digital-to-analog transfer function is
V
k
V
OUT IDEAL
N
REF
() =
2
where k is the decimal equivalent of the binary DAC
input code, N is the resolution, and VREF is either 2.5V
(LTC2630-L) or 4.096V (LTC2630-H) in internal refer-
ence mode, and VCC in Supply as reference mode.
Table 1. Command Codes
Command*
C3
C2
C1
C0
0
Write to Input Register
0
1
Update (Power up) DAC Register
0
1
Write to and Update (Power up) DAC Register
0
1
0
Power down
0
1
0
Select Internal Reference (Power-on Reset Default)
0
1
Select Supply as Reference (VREF = VCC )
*Command codes not shown are reserved and should not be used.
Figure 1. Serial Interface Timing
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