參數(shù)資料
型號(hào): LTCZQ
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): 13/20頁(yè)
文件大?。?/td> 317K
代理商: LTCZQ
LTC2641/LTC2642
13
26412f
APPLICATIONS INFORMATION
Bipolar Configuration
Figure 3 shows a typical bipolar DAC application for the
LTC2642. The on-chip bipolar offset/gain resistors, R
FB
and R
INV
, are connected to an external amplifier to produce
a bipolar output swing from –V
REF
to V
REF
at the R
FB
pin.
The amplifier circuit provides a gain of +2 from the V
OUT
pin, and gain of –1 from V
REF
. Tables 2a, 2b and 2c show
the bipolar offset binary code tables for 16-bit, 14-bit and
12-bit operation.
1/2 LT1678
+
16-BIT DAC
5V
–5V
5V/3V
V
2.5V
V
DD
LTC2642-16
BIPOLAR V
–2.5V TO 2.5V
4.7
μ
F
C1
10pF
0.1
μ
F
0.1
μ
F
REF
1
6
10
V
OUT
7
INV
8
R
FB
GND
26412 F02
0.1
μ
F
0.1
μ
F
9
5
4
3
2
CS
SCLK
DIN
CLR
LT1019CS8-2.5
GND
OUT
5V
IN
Table 2b. 14-Bit Bipolar Offset Binary
Code Table (LTC2642-14)
DIGITAL INPUT
BINARY NUMBER
IN DAC LATCH
MSB LSB
1111 1111 1111 11xx V
REF
(8,191/8,192)
1000 0000 0000 01xx V
REF
(1/8,192)
1000 0000 0000 00xx 0V
0111 1111 1111 11xx –V
REF
(1/8,192)
0000 0000 0000 00xx –V
REF
ANALOG OUTPUT
(V
OUT
)
Figure 3. 16-Bit Bipolar Output (LTC2642-16) V
OUT
= –V
REF
to V
REF
Table 2a. 16-Bit Bipolar Offset Binary
Code Table (LTC2642-16)
DIGITAL INPUT
BINARY NUMBER
IN DAC LATCH
MSB LSB
1111 1111 1111 1111 V
REF
(32,767/32,768)
1000 0000 0000 0001 V
REF
(1/32,768)
1000 0000 0000 0000 0V
0111 1111 1111 1111 –V
REF
(1/32,768)
0000 0000 0000 0000 –V
REF
ANALOG OUTPUT
(V
OUT
)
Table 2c. 12-Bit Bipolar Offset Binary
Code Table (LTC2642-12)
DIGITAL INPUT
BINARY NUMBER
IN DAC LATCH
MSB LSB
1111 1111 1111 xxxx V
REF
(2,047/2,048)
1000 0000 0001 xxxx V
REF
(1/2,048)
1000 0000 0000 xxxx 0V
0111 1111 1111 xxxx –V
REF
(1/2048)
0000 0000 0000 xxxx –V
REF
ANALOG OUTPUT
(V
OUT
)
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