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參數(shù)資料
| 型號： | OP249AZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP JFET 4.7MHZ DUAL 8CDIP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | J-FET |
| 電路數(shù)： | 2 |
| 轉(zhuǎn)換速率： | 22 V/µs |
| 增益帶寬積： | 4.7MHz |
| 電流 - 輸入偏壓： | 30pA |
| 電壓 - 輸入偏移： | 200µV |
| 電流 - 電源： | 5.6mA |
| 電流 - 輸出 / 通道： | 36mA |
| 電壓 - 電源，單路/雙路(±)： | ±4.5 V ~ 18 V |
| 工作溫度： | -55°C ~ 125°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 8-CDIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 8-CERDIP |
| 包裝： | 管件 |
Data Sheet
OP249
Rev. H | Page 15 of 20
DAC OUTPUT AMPLIFIER
Unity-gain stability, a low offset voltage of 300 μV typical, and a
fast settling time of 870 ns to 0.01%, makes the OP249 an ideal
amplifier for fast DACs.
For CMOS DAC applications, the low offset voltage of the OP249
results in excellent linearity performance. CMOS DACs, such as
the PM7545, typically have a code-dependent output resistance
variation between 11 kΩ and 33 kΩ. The change in output
resistance, in conjunction with the 11 kΩ feedback resistor, results
in a noise gain change, which causes variations in the offset
error, increasing linearity errors. The OP249 features low offset
voltage error, minimizing this effect and maintaining 12-bit
linearity performance over the full-scale range of the converter.
Because the DAC output capacitance appears at the inputs of
the op amp, it is essential that the amplifier be adequately
compensated. Compensation increases the phase margin and
ensures an optimal overall settling response. The required lead
compensation is achieved with Capacitor C in Figure 48.
+15V
PM7545
12
500
75
AGND
DGND
DATA INPUT
REFERENCE
OR VIN
VDD
0.1F
VOUT
VDD
RFB
OUT1
DB11 TO DB0
19
18
20
3
VREF
C
33pF
–15V
1
2
3
2
8
4
0.1F
1
1/2
OP249
002
96-
04
7
Figure 47. Fast Settling and Low Offset Error of the OP249 Enhances CMOS DAC Performance—Unipolar Operation
+15V
PM7545
500
75
AGND
DGND
12
DATA INPUT
VOUT
0.1F
–15V
1/2
OP249
1/2
OP249
7
5
6
4
R5
10k
1%
R4
20k
1%
R3
10k
1%
1
8
2
3
1
2
3
0.1F
C
33pF
VDD
0.1F
REFERENCE
OR VIN
DB11 TO DB0
OUT1
RFB
VDD
VREF
18
20
19
00
29
6-
0
48
Figure 48. Fast Settling and Low Offset Error of the OP249 Enhances CMOS DAC Performance—Bipolar Operation
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OP249AZ/883 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:OP-AMP|DUAL|BIPOLAR/JFET|DIP|8PIN|CERAMIC |
| OP249AZMDA | 制造商:Analog Devices 功能描述: |
| OP249EJ | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual, Precision JFET High Speed Operational Amplifier |
| OP249EZ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| OP249FJ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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