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參數(shù)資料
| 型號： | OP249GSZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運算放大器 |
| 英文描述： | Dual, Precision JFET High Speed Operational Amplifier; Package: SOIC; No of Pins: 8; Temperature Range: Industrial |
| 中文描述： | DUAL OP-AMP, 3600 uV OFFSET-MAX, 4.7 MHz BAND WIDTH, PDSO8 |
| 封裝： | ROHS COMPLIANT, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 464K |
| 代理商： | OP249GSZ-REEL7 |
OP249
Rev. G | Page 15 of 20
DAC OUTPUT AMPLIFIER
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.
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.
+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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