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参数资料
| 型号： | 5962-9151901MGA |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 运算放大器 |
| 英文描述： | DUAL OP-AMP, 500 uV OFFSET-MAX, 4.7 MHz BAND WIDTH, MBCY8 |
| 封装： | METAL CAN, 8 PIN |
| 文件页数： | 4/16页 |
| 文件大小： | 1005K |
| 代理商： | 5962-9151901MGA |
OP249
–12–
REV. E
Figure 13 illustrates the effect of altering the compensation on
the output response of the circuit in Figure 12a. Compensation
is required to address the combined effect of the DAC’s output
capacitance, the op amp’s input capacitance and any stray capaci-
tance. Slight adjustments to the compensation capacitor may be
required to optimize settling response for any given application.
The settling time of the combination of the current output DAC
and the op amp can be approximated by:
tS TOTAL
= (t
S DAC )
2
+(t
S AMP )
2
The actual overall settling time is affected by the noise gain of
the amplifier, the applied compensation, and the equivalent
input capacitance at the amplifier’s input.
DISCUSSION ON DRIVING A/D CONVERTERS
Settling characteristics of operational amplifiers also include an
amplifier’s ability to recover, i.e., settle, from a transient current
output load condition. An example of this includes an op amp
driving the input from a SAR type A/D converter. Although the
comparison point of the converter is usually diode clamped, the
input swing of plus-and-minus a diode drop still gives rise to a
significant modulation of input current. If the closed-loop output
impedance is low enough and bandwidth of the amplifier is
sufficiently large, the output will settle before the converter
makes a comparison decision which will prevent linearity errors
or missing codes.
Figure 14 shows a settling measurement circuit for evaluating
recovery from an output current transient. An output disturbing
current generator provides the transient change in output
load current of 1 mA. As seen in Figure 15, the OP249 has
extremely fast recovery of 274 ns (to 0.01%), for a 1 mA load
transient. The performance makes it an ideal amplifier for
data acquisition systems.
B
A
C = 5pF
RESPONSE IS GROSSLY UNDERDAMPED,
AND EXHIBITS RINGING
C = 15pF
FAST RISE TIME CHARACTERISTICS, BUT AT EXPENSE
OF SLIGHT PEAKING IN RESPONSE
Figure 13. Effect of Altering Compensation from Circuit in Figure 12a—PM7545 CMOS DAC with 1/2 OP249, Unipolar
Operation. Critically Damped Response Will Be Obtained with C
33 pF.
|VREF|
1k
IOUT =
1/2
OP249
+15V
–15V
0.1 F
+15V
1.5k
1N4148
0.1 F
220
1.8k
1k
2N3904
1k
10 F
VREF
0.47 F
0.01 F
*
*NOTE: DECOUPLE CLOSE TOGETHER
ON GROUND PLANE WITH
SHORT LEAD LENGTHS
TTL INPUT
+15V
2N2907
7A13 PLUG-IN
300pF
Figure 14. Transient Output Impedance Test Fixture
The combination of high speed and excellent dc performance of
the OP249 makes it an ideal amplifier for 12-bit data acquisition
systems. Examining the circuit in Figure 16, one amplifier in the
OP249 provides a stable –5 V reference voltage for the VREF input
of the ADC912. The other amplifier in the OP249 performs
high speed buffering of the A/D’s input.
Examining the worst case transient voltage error (Figure 17) at
the Analog In node of the A/D converter: the OP249 recovers in
less than 100 ns. The fast recovery is due to both the OP249’s
wide bandwidth and low dc output impedance.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 5962-9151901MPA | 功能描述:高速运算放大器 alL DWG OP249AZMDA IC RoHS:否 制造商:Texas Instruments 通道数量:1 电压增益 dB:116 dB 输入补偿电压:0.5 mV 转换速度:55 V/us 工作电源电压:36 V 电源电流:7.5 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube 产品: |
| 5962-9152101M3A | 制造商:Analog Devices 功能描述:ADC Single SAR 116ksps 12-bit Parallel 28-Pin LCC 制造商:Analog Devices 功能描述:ADC SGL SAR 116KSPS 12-BIT PARALLEL 28PIN LCC - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:4-CHANNEL 12-BIT ADC IC - Bulk 制造商:Analog Devices Inc. 功能描述:Analog to Digital Converters - ADC 4-CHANNEL 12-BIT DAQ system 制造商:Analog Devices 功能描述:CONVERTER - ADC |
| 5962-9152101MXA | 功能描述:模数转换器 - ADC 12B Data Acquisition System IC RoHS:否 制造商:Analog Devices 通道数量: 结构: 转换速率: 分辨率: 输入类型: 信噪比: 接口类型: 工作电源电压: 最大工作温度: 安装风格: 封装 / 箱体: |
| 5962-9152801MYA | 制造商:QP Semiconductor 功能描述:OR/NOR GATE 3-ELEMENT 5-IN ECL 24-PIN CPAK |
| 59629153001MXA | 制造商:National Semiconductor 功能描述:100324DMQB |
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