參數(shù)資料
型號： LTC1590CS
廠商： LINEAR TECHNOLOGY CORP
元件分類： DAC
英文描述： Dual Serial 12-Bit Multiplying DAC
中文描述： DUAL, SERIAL INPUT LOADING, 0.3 us SETTLING TIME, 12-BIT DAC, PDSO16
封裝： 0.150 INCH, PLASTIC, SO-16
文件頁數(shù)： 8/12頁
文件大?。?/td> 288K
代理商： LTC1590CS
8
LTC1590
Unipolar 2-Quadrant Multiplying Mode
(V
OUT
= 0V to –V
REF
)
The LTC1590 can be used with a dual op amp to provide
a dual 2-quadrant multiplying DAC as shown in Figure 2.
The unipolar DAC transfer function is shown in Table 1.
The 33pF feedback capacitor is recommended to compen-
sate for the pole caused by the internal feedback resistor
and the OUT1 output capacitance. For high speed op amps
this feedback capacitor is required for stability, and a
smaller value, 8pF to 15pF, may be desired to get the
fastest transient response and shortest settling time. A
larger feedback capacitor can be used to reduce wideband
noise, glitch impulse and distortion for lower frequency
signals. A pole is introduced in the DAC transfer function
at approximately (C
FB
)(R
FB
). For example, a 100pF feed-
back capacitor will typically give a pole at:
145
1
2 100
(
11
kHz
pF
k
=
)(
)
APPLICATIO
S I
N
FOR
ATIO
U
W
U
Figure 3. Bipolar Operation (4-Quadrant Multiplication)
–15V
5V
0.1
μ
F
V
CC
V
REF
LTC1590
DAC A OR DAC B
R
FB
DGND
AGND
V
REF
–10V TO 10V
OUT1
OUT2
V
OUT
–V
REF
TO V
REF
1590 F03
15V
–
+
1/2
LT1112
R3
20k
R1
10k
R2
20k
15V
–15V
–
+
1/2
LT1112
33pF
Table 1. Unipolar Binary Code Table
DIGITAL INPUT
BINARY NUMBER
IN DAC REGISTER
MSB LSB
1111 1111 1111
1000 0000 0000
0000 0000 0001
0000 0000 0000
ANALOG OUTPUT
V
OUT
–V
REF
(4095/4096)
–V
REF
(2048/4096) = –V
REF
/2
–V
REF
(1/4096)
0V
Bipolar 4-Quadrant Multiplying Mode
(V
OUT
= –V
REF
to +V
REF
)
The circuit of Figure 3 can be used to provide a dual
4-quadrant multiplying DAC. This circuit starts with the
unipolar application circuit and adds three resistors and an
op amp. These extra devices provide a gain of –2 from the
unipolar output to the bipolar output, plus an offset of
(–1)(V
REF
) to produce the transfer function shown in Table
2. A pack of matched 20k resistors, with two resistors in
parallel forming the 10k resistor, is recommended.
Table 2. Bipolar Offset Binary Code Table
DIGITAL INPUT
BINARY NUMBER
IN DAC REGISTER
MSB LSB
1111 1111 1111
1000 0000 0001
1000 0000 0000
0111 1111 1111
0000 0000 0000
ANALOG OUTPUT
V
OUT
+V
REF
(2047/2048)
+V
REF
(1/2048)
0V
–V
REF
(1/2048)
–V
REF
(2048/2048) = –V
REF
V
CC
V
REF
LTC1590
DAC A OR DAC B
R
FB
OUT1
DGND
AGND
5V
V
–10V TO 10V
OUT2
33pF
V
OUT
0V TO –V
REF
1590 F02
0.1
μ
F
–
+
1/2
LT1112
15V
–15V
Figure 2. Unipolar Operation (2-Quadrant Multiplication)
相關(guān)PDF資料
PDF描述
LTC1590I 8-Bit, 75 kSPS ADC Serial-Out, On-Chip 12-Ch. Analog Mux, 11 Ch. 20-PLCC
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LTC1590 Dual Serial 12-Bit Multiplying DAC(雙路串行電流輸出12位乘法數(shù)模轉(zhuǎn)換器)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LTC1590CS#PBF 制造商:Linear Technology 功能描述:D/A Converter (D-A) IC
LTC1590CS#TR 功能描述:IC DAC 12BIT MULT DUAL 16SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:47 系列:- 設(shè)置時間:2µs 位數(shù):14 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:單電源 功率耗散（最大）:55µW 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:28-SSOP 包裝:管件 輸出數(shù)目和類型:1 電流，單極；1 電流，雙極 采樣率（每秒）:*
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LTC1590CSPBF 制造商:Linear Technology 功能描述:Dual Serial 12-Bit Multiplying DAC SO16
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