- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄373894 > AD7226KP (ANALOG DEVICES INC) LC2MOS Quad 8-Bit D/A Converter PDF資料下載
參數(shù)資料
| 型號： | AD7226KP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | LC2MOS Quad 8-Bit D/A Converter |
| 中文描述： | PARALLEL, 8 BITS INPUT LOADING, 3 us SETTLING TIME, 8-BIT DAC, PQCC20 |
| 封裝： | PLASTIC, MO-047AA, LCC-20 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 247K |
| 代理商： | AD7226KP |
AD7226
REV. A
–9–
Figure 14. AGND Bias Circuit
For a given V
IN
, increasing AGND above system GND will re-
duce the effective V
DD
–V
REF
which must be at least 4 V to en-
sure specified operation. Note that because the AGND pin is
common to all four DACs, this method biases up the output
voltages of all the DACs in the AD7226. Note that V
DD
and V
SS
of the AD7226 should be referenced to DGND.
3-PHASE SINE WAVE
T he circuit of Figure 15 shows an application of the AD7226 in
the generation of 3-phase sine waves which can be used to con-
trol small 3-phase motors. T he proper codes for synthesizing a
full sine wave are stored in EPROM, with the required phase-
shift of 120
°
between the three D/A converter outputs being
generated in software.
Data is loaded into the three D/A converters from the sine
EPROM via the microprocessor or control logic. T hree loops
are generated in software with each D/A converter being loaded
from a separate loop. T he loops run through the look-up table
producing successive triads of sinusoidal values with 120
°
sepa-
ration which are loaded to the D/A converters producing 3 sine
wave voltages 120
°
apart. A complete sine wave cycle is gener-
ated by stepping through the full look-up table. If a 256-element
sine wave table is used then the resolution of the circuit will be
1.4
°
(360
°
/256). Figure 17 shows typical resulting waveforms.
T he sine waves can be smoothed by filtering the D/A converter
outputs.
T he fourth D/A converter of the AD7226, DAC D, may be used
in a feedback configuration to provide a programmable refer-
ence voltage for itself and the other three converters. T his con-
figuration is shown in Figure 15. T he relationship of V
REF
to V
IN
is dependent upon digital code and upon the ratio of R
F
to R
and is given by the formula
(1
+
G
)
(1
+
G
.
D
D
)
V
IN
V
REF
=
where
G
= R
F
/R
and
D
D
is a fractional representation of the digital word
in latch D.
Alternatively, for a given V
IN
and resistance ratio, the required
value of D
D
for a given value of V
REF
can be determined from
the expression
D
D
=
(1
+
R
/
R
F
)
V
IN
V
REF
±
R
R
F
Figure 16 shows typical plots of V
REF
versus digital code for
three different values of R
F
. With V
IN
= +2.5 V and R
F
= 3 R
the peak-to-peak sine wave voltage from the converter outputs
will vary between +2.5 V and +10 V over the digital input code
range of 0 to 255.
Figure 16. Variation of V
REF
with Feedback Configuration
Figure 17. 3-Phase Sine Wave Output
Figure 15. 3-Phase Sine Wave Generation Circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD7226KR | LC2MOS Quad 8-Bit D/A Converter |
| AD7226TQ | LC2MOS Quad 8-Bit D/A Converter |
| AD7228AUQ3 | LC2MOS Octal 8-Bit DAC |
| AD7228 | LC2MOS Octal 8-Bit DAC |
| AD7228ABN | LC2MOS Octal 8-Bit DAC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7226KP-REEL | 制造商:Analog Devices 功能描述:DAC 4-CH R-2R 8-bit 20-Pin PLCC T/R 制造商:Analog Devices 功能描述:DAC 4-CH R-2R 8BIT 20PLCC - Tape and Reel |
| AD7226KPZ | 功能描述:IC DAC 8BIT LC2MOS QUAD 20-PLCC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 標準包裝:1 系列:- 設(shè)置時間:4.5µs 位數(shù):12 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOICN 包裝:剪切帶 (CT) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:* 其它名稱:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
| AD7226KPZ | 制造商:Analog Devices 功能描述:IC 8-BIT DAC |
| AD7226KPZ-REEL | 功能描述:IC DAC 8BIT QUAD W/AMP 20PLCC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓模塊:Data Converter Fundamentals DAC Architectures 標準包裝:750 系列:- 設(shè)置時間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應(yīng)商設(shè)備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
| AD7226KR | 功能描述:IC DAC 8BIT LC2MOS QUAD 20-SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓模塊:Data Converter Fundamentals DAC Architectures 標準包裝:750 系列:- 設(shè)置時間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應(yīng)商設(shè)備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。