參數(shù)資料
型號(hào)： LTC2704IGW-12#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 7/22頁(yè)
文件大小： 0K
描述： IC DAC 12BIT QUAD VOUT 44-SSOP
產(chǎn)品培訓(xùn)模塊： LTC275x 18-Bit DAC
標(biāo)準(zhǔn)包裝： 1,000
設(shè)置時(shí)間： 8µs
位數(shù)： 12
數(shù)據(jù)接口： 串行，SPI?
轉(zhuǎn)換器數(shù)目： 4
電壓電源： 模擬和數(shù)字，雙 ±
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 44-BSOP（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 44-SSOP
包裝： 帶卷 (TR)
輸出數(shù)目和類型： 4 電壓，單極；4 電壓，雙極
采樣率（每秒）： *
LTC2704
15
2704fd
Examples
1. Using a 24-bit loading sequence, load DAC A with the
unipolar range of 0V to 10V, output at zero volts and all
other DACs with the bipolar range of ±10V, outputs at
zero volts. Note all DAC outputs should change at the
same time.
a) CS/LD↓
b) Clock SDI = 0010 1111 0000 0000 0000 0011
c) CS/LD↑
B1-Range of all DACs set to bipolar ±10V.
d) CS/LD↓
Clock SDI = 0010 0000 0000 0000 0000 0001
e) CS/LD↑
B1-Range of DAC A set to unipolar 0V to 10V.
f) CS/LD↓
Clock SDI = 0011 1111 1000 0000 0000 0000
g) CS/LD↑
B1-Code of all DACs set to midscale.
h) CS/LD↓
Clock SDI = 0011 0000 0000 0000 0000 0000
i) CS/LD↑
B1-Code of DAC A set to zero code.
j) CS/LD↓
Clock SDI = 0100 1111 XXXX XXXX XXXX XXXX
k) CS/LD↑
Update all DACs B1s into B2s for both Code and
Range.
l) Alternatively steps j and k could be replaced with
LDAC
.
2. Using a 32-bit load sequence, load DAC C with bipolar
± 2.5V and its output at zero volts. Use readback to
check B1 contents before updating the DAC output
(i.e., before copying B1 contents into B2).
a) CS/LD↓ (Note that after power-on, the Code in B1 is
zero)
b) Clock SDI = 0000 0000 0011 0100 1000 0000 0000
0000
c) CS/LD↑
B1-Code of DAC C set to midscale setting.
d) CS/LD↓
Clock SDI = 0000 0000 0010 0100 0000 0000 0000
0100
e) Read Data out on SRO = 1000 0000 0000 0000
Veries that B1-Code DAC C is at midscale setting.
f) CS/LD↑
B1-Range of DAC C set to Bipolar ±2.5V range.
g) CS/LD↓
Clock SDI = 0000 0000 1010 0100 xxxx xxxx xxxx
xxxx
Data Out on SRO = 0000 0000 0000 0100
Veries that B1-Range of DAC C set to Bipolar ±2.5V
Range.
CS/LD↑
h) CS/LD↓
Clock SDI = 0000 0000 0100 0100 xxxx xxxx xxxx
xxxx
i) CS/LD↑
Update DAC C B1 into B2 for both Code and Range
j) Alternatively steps h and i could be replaced with
LDAC
.
System Offset Adjustment
Many systems require compensation for overall system
offset, which may be an order of magnitude or more greater
than the excellent offset of the LTC2704.
The LTC2704 has individual offset adjust pins for each
of the four DACs. VOSA, VOSB, VOSC and VOSD are
referred to their corresponding signal grounds, AGNDA,
AGNDB, AGNDC and AGNDD. For noise immunity and
ease of adjustment, the control voltage is attenuated to
the DAC output:
VOS = –0.01 V(VOSx) [0V to 5V, ±2.5V spans]
VOS = –0.02 V(VOSx) [0V to 10V, ±5V,
–2.5V to 7.5V spans]
VOS = –0.04 V(VOSx) [±10V span]
The nominal input range of these pins is ±5V; other refer-
ence voltages of up to ±15V may be used if needed.
The VOSx pins have an input impedance of 1MΩ. To pre-
serve the settling performance of the LTC2704, these pins
OPERATION
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