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參數(shù)資料
| 型號(hào)： | LTCZS |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 16-/14-/12-Bit VOUT DACs in 3mm 】 3mm DFN |
| 中文描述： | 16/14/12 VOUT電源數(shù)模轉(zhuǎn)換器采用3mm DFN封裝】3毫米 |
| 文件頁(yè)數(shù)： | 12/20頁(yè) |
| 文件大小： | 317K |
| 代理商： | LTCZS |
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LTC2641/LTC2642
12
26412f
Power-On Reset
The LTC2641/LTC2642 include a power-on reset circuit
to ensure that the DAC ouput comes up in a known state.
When V
DD
is first applied, the power-on reset circuit sets
the output of the LTC2641 to zero-scale (code 0). The
LTC2642 powers up to midscale (bipolar zero). Depend-
ing on the DAC number of bits, the midscale code is:
OPERATION
32,768 (LTC2642-16); 8,192 (LTC2642-14); or 2,048
(LTC2642-12).
Clearing the DAC
A 10ns (minimum) low pulse on the
C
L
R pin asynchro-
nously clears the DAC latch to code zero (LTC2641) or to
midscale (LTC2642).
APPLICATIONS INFORMATION
Unipolar Configuration
Figure 2 shows a typical unipolar DAC application for
the LTC2641. Tables 1a, 1b and 1c show the unipolar
binary code tables for 16-bit, 14-bit and 12-bit operation.
–
1/2 LTC6078
+
16-BIT DAC
5V/3V
5V/3V
V
2.5V
V
DD
LTC2641-16
UNIPOLAR V
OUT
0V TO 2.5V
4.7
μ
F
0.1
μ
F
REF
1
6
8
V
OUT
GND
26412 F02
0.1
μ
F
0.1
μ
F
7
5
4
3
2
CS
SCLK
DIN
CLR
LT
1019CS8-2.5
GND
OUT
5V
IN
The external amplifier provides a unity-gain buffer. The
LTC2642 can also be used in unipolar configuration by
tying R
FB
and INV to REF. This provides power-up and
clear to midscale.
Table 1b. 14-Bit Unipolar Binary Code Table
(LTC2641-14)
DIGITAL INPUT
BINARY NUMBER
IN DAC LATCH
MSB LSB
1111 1111 1111 11xx V
REF
(16,383/16,384)
1000 0000 0000 00xx V
REF
(8,192/16,384) = V
REF
/2
0000 0000 0000 01xx V
REF
(1/16,384)
0000 0000 0000 00xx 0V
ANALOG OUTPUT
(V
OUT
)
Figure 2. 16-Bit Unipolar Output (LTC2641-16) Unipolar V
OUT
= 0V to V
REF
Table 1a. 16-Bit Unipolar Binary Code Table
(LTC2641-16)
DIGITAL INPUT
BINARY NUMBER
IN DAC LATCH
MSB LSB
1111 1111 1111 1111 V
REF
(65,535/65,536)
1000 0000 0000 0000 V
REF
(32,768/65,536) = V
REF
/2
0000 0000 0000 0001 V
REF
(1/65,536)
0000 0000 0000 0000 0V
ANALOG OUTPUT
(V
OUT
)
Table 1c. 12-Bit Unipolar Binary Code Table
(LTC2641-12)
DIGITAL INPUT
BINARY NUMBER
IN DAC LATCH
MSB LSB
1111 1111 1111 xxxx V
REF
(4,095/4,096)
1000 0000 0000 xxxx V
REF
(2,048/4,096) = V
REF
/2
0000 0000 0001 xxxx V
REF
(1/4,096)
0000 0000 0000 xxxx 0V
ANALOG OUTPUT
(V
OUT
)
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