參數(shù)資料
型號(hào): AD7225KN
廠商: Analog Devices Inc
文件頁(yè)數(shù): 5/24頁(yè)
文件大?。?/td> 0K
描述: IC DAC 8BIT QUAD W/AMP 24-DIP
產(chǎn)品培訓(xùn)模塊: Data Converter Fundamentals
DAC Architectures
產(chǎn)品變化通告: Product Discontinuance 27/Oct/2011
標(biāo)準(zhǔn)包裝: 15
設(shè)置時(shí)間: 4µs
位數(shù): 8
轉(zhuǎn)換器數(shù)目: 4
電壓電源: 雙 ±
功率耗散(最大): 500mW
工作溫度: -40°C ~ 85°C
安裝類型: 通孔
封裝/外殼: 24-DIP(0.300",7.62mm)
供應(yīng)商設(shè)備封裝: 24-PDIP
包裝: 管件
輸出數(shù)目和類型: 4 電壓,單極;4 電壓,雙極
采樣率(每秒): 200k
AD7225
Rev. C | Page 13 of 24
UNIPOLAR OUTPUT OPERATION
This is the basic mode of operation for each channel of the
AD7225, with the output voltage having the same positive
polarity as VREFx. The AD7225 can be operated single supply
(VSS = AGND) or with positive/negative supplies (see the Op
Amp Section, which outlines the advantages of having negative
VSS). Connections for the unipolar output operation are shown
in Figure 16. The voltage at any of the reference inputs must
never be negative with respect to DGND. Failure to observe this
precaution may cause parasitic transistor action and possible
device destruction. The code table for unipolar output
operation is shown in Table 7.
Note,
(
)
( )
=
256
1
2
1
8
REF
V
LSB
VREFA VREFB VREFC VREFD
VDD
VSS
AGND
DGND
VOUTA
DAC A
VOUTB
DAC B
VOUTC
DAC C
VOUTD
DAC D
DB7
(MSB)
DB0
(LSB)
A1
A2
WR
LDAC
AD7225
00986-
016
Figure 16. Unipolar Output Circuit
Table 7. Unipolar Code Table
DAC Latch Contents
Analog Output
MSB
LSB
1111
( )
256
255
REF
V
+
1000
0001
( )
256
129
REF
V
+
1000
0000
( )
2
256
128
REF
V
+
=
+
0111
1111
( )
256
127
REF
V
+
0000
0001
( )
256
1
REF
V
+
0000
0 V
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