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參數(shù)資料
| 型號： | AD7226KRZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 16/16頁 |
| 文件大小： | 0K |
| 描述： | IC DAC 8BIT QUAD W/AMP 20SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Data Converter Fundamentals DAC Architectures |
| 標準包裝： | 1,000 |
| 設(shè)置時間： | 4µs |
| 位數(shù)： | 8 |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 4 |
| 電壓電源： | 雙 ± |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-SOIC W |
| 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）： | 143k |
REV.
AD7226
–9–
DAC A
DAC B
DAC C
DAC D
MSB
VREF
VDD
DGND
AGND
VSS
VOUTA
WR
A1
A0
LSB
VOUTB
VOUTC
VOUTD
DB7
DB0
Figure 8. AD7226 Unipolar Output Circuit
Table II. Unipolar Code Table
DAC Latch Contents
MSB
LSB
Analog Output
1 1 1 1
+
VREF
255
256
1 0 0 0
0 0 0 1
+
VREF
129
256
1 0 0 0
0 0 0 0
+
=+
V
REF
128
256
2
0 1 1 1
1 1 1 1
+
VREF
127
256
0 0 0 0
0 0 0 1
+
VREF
1
256
0 0 0 0
0 V
Note LSB
V
REF
:
–
=
()
()=
2
1
256
8
(2)
Bipolar Output Operation
Each of the DACs of the AD7226 can be individually config-
ured to provide bipolar output operation. This is possible using
one external amplifier and two resistors per channel. Figure 9
shows a circuit used to implement offset binary coding (bipolar
operation) with DAC A of the AD7226. In this case
V
R
DV
R
V
OUT
A
REF
=+
()
()
1
2
1
2
1
–
(3)
With R1 = R2
VD
V
OUT
A
REF
=
()
21
–
(4)
where DA is a fractional representation of the digital word in latch A.
Mismatch between R1 and R2 causes gain and offset errors and
therefore these resistors must match and track over tempera-
ture. Once again the AD7226 can be operated in single supply
or from positive/negative supplies. Table III shows the digital
code versus output voltage relationship for the circuit of Figure 9
with R1 = R2.
DAC A
VREF
VDD
DGND
AGND
VSS
VOUTA
VOUT
VREF
AD7226*
R2
R1
+15V
–15V
R1, R2 = 10k
0.1%
*DIGITAL INPUTS OMITTED
FOR CLARITY
Figure 9. AD7226 Bipolar Output Circuit
Table III. Bipolar (Offset Binary) Code Table
DAC Latch Contents
MSB
LSB
Analog Output
1 1 1 1
+
VREF
127
128
1 0 0 0
0 0 0 1
+
VREF
1
128
1 0 0 0
0 0 0 0
0 V
0 1 1 1
1 1 1 1
–VREF
1
128
0 0 0 0
0 0 0 1
–VREF
127
128
0 0 0 0
––
VV
REF
128
=
AGND BIAS
The AD7226 AGND pin can be biased above system GND
(AD7226 DGND) to provide an offset “zero” analog output
voltage level. Figure 10 shows a circuit configuration to achieve
this for channel A of the AD7226. The output voltage, VOUTA,
can be expressed as:
VA
V
D V
OUT
BIAS
A
IN
=+
()
(5)
where DA is a fractional representation of the digital input word
(0
D 255/256).
D
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AD7226TD | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Digital-to-Analog Converter |
| AD7226TE | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Digital-to-Analog Converter |
| AD7226TE/883B | 制造商:Analog Devices 功能描述:DAC 4-CH R-2R 8BIT 20PIN LCC - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:CMOS DAC IC - Bulk |
| AD7226TQ | 功能描述:數(shù)模轉(zhuǎn)換器- DAC QUAD 8 BIT V-OUT IC RoHS:否 制造商:Analog Devices 轉(zhuǎn)換器數(shù)量:4 DAC 輸出端數(shù)量:4 轉(zhuǎn)換速率: 分辨率:12 bit 接口類型:Serial (I2C) 穩(wěn)定時間: 最大工作溫度:+ 105 C 安裝風(fēng)格: 封裝 / 箱體:TSSOP 封裝:Reel |
| AD7226TQ/883B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Digital-to-Analog Converter |
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