Features

High conversion rate: 170V/μs

Broadband: 28MHz 123]

Fast settlement time: lt; 200ns to 0.01%

Low -dimensional voltage: lt; 500 μV units are stable [123 123 ]

Low -voltage operation: ± 5 v to ± 15 v

Low power current: lt; 10 mia 123]

Drive capacitance load

High -speed image display driver

High -frequency active filter

Quick Instrument amplifier

#8226 ; High -speed detector

Pointer

123] Generally explained OP467 is a high -speed precision computing amplifier. It provides the performance of a high -speed computing amplifier, and combines the advantages of precision computing amplifiers in a packaging. OP467 is an ideal choice for applications. Traditionally, multiple operational amplifiers are used to achieve the speed and accuracy of this level.

The internal compensation of OP467 guarantees the stable operation of the unit, and can drive a large -capacity capacitor load without oscillation. The gain bandwidth of OP467 is 28MHz, drives 30PF load, and the output conversion rate is 170V/μs. It stabilizes to 0.01%within a time of less than 200NS, providing good dynamic accuracy for the high -speed data collection system. At 10 MHz, the interval between channels to channels is usually 60 dB. The DC performance of OP467 includes the offset of less than 0.5mV, the voltage noise density is less than 6nv/√Hz, and the total power supply current is lower than 10mA. Common model suppression ratio (CMRR) is usually 85 decibels. Power suppression ratio (PSRR) is usually 107 DB. When the input frequency is as high as 1MHz, PSRR remains above 40dB. Low offset and drifting plus high -speed and low noise enable OP467 to be used for applications such as high -speed detectors and instruments.

OP467 stipulates that in the extended industryTemperature range ( 40 ° C to+85 ° C) from ± 5 V to ± 15 V within the range, which can be used for 14 -drawing PDIP, 14 DRICERDIP, 16 DRC SOIC and 20 terminal LCC. For MIL-SD-883 data tables and availability, please contact your local sales office.

pin configuration

Dice feature

Typical performance features

Application Information

Output short -circuit performance

In order to achieve the broad band width and high conversion rate, the OP467 output does not have short circuit protection. The short -circuit of the output and the ground or power may damage the device. In order to run safely, the output load current should be limited so that the knot temperature should not exceed the absolute maximum knot temperature. The maximum internal power consumption can pass: In the formula: TJ and TA are mild environmental temperatures, respectively.

PD is the internal power consumption of the device.

θja is the thermal resistance of the packaging device given in the data table.

Unused amplifier

It is recommended to connect any unused amplifier in the four -dollar packaging as a unit gain follower to the 1 kΩ feedback resistor and connect to the ground plane without reverse input.

Printing circuit board (PCB) layout precautions

The good performance of high -speed computing amplifier depends to a good PCB layout. In order to obtain the best dynamic performance, follow the high -frequency layout technology.

Ground

In high -speed applications, in order to obtain the best performance, good ground flatness is essential. By providing low impedance reference points, it can significantly reduce the adverse effects of ground circuits and infrared pressure drops. The best result is to design a multi -layer design specified to the ground. In order to maintain continuous low impedance grounding and avoid running any records on this layer.

Power supply considerations

For normal work, the positive power supply must be connected in order before the negative electrode power supply. All users should take measures to ensure this. In high -frequency circuits, the lead length of the device introduces the inductance in series with the circuit. The combination of this inductance and bandate capacitors forms a high -frequency resonance circuit. The poles generated by these circuits will lead to the peak and additional phase of gain and additional phase, thereby reducing the transportationThe phase margin of the amplifier leads to unstable work.

A practical method to solve this problem is to reduce the resonance frequency to a sufficiently low level to use the power supply of the amplifier. This is easy to do this. Put the capacitor through the power cord and ground layer, as close to the device pin as much as possible. Because the capacitor also has internal parasitic elements, such as the sensory inductance, it is important to choose the appropriate capacitor. For effective, they should have low impedance within the frequency range of interest.电 The capacitor becomes a good choice due to its high capacitor/size ratio, but its effective series resistance (ESR) increases with the frequency.

On the other hand, ceramic -type capacitors have good ESR and effective series inductors (ESL) performance at a higher frequency, and because of their small volume, they can be placed close to the device pin, which further reduces further reduction Masturbage inductance. The combination of these two capacitors can get the best results. It is recommended to use 5 μF to 10 μF f f and UMC container and 0.1 μF ceramic capacitor. If an additional isolation is needed to enter the high -frequency resonance of the power supply, a iron oxygen magnetic beads should be connected in series on the power line between the power container and the power supply. Note that adding iron oxygen magnets will bring new poles and zero points to the frequency response to the circuit. If it is not selected, it may cause unstable operation.

Signal Precautions

Input and output trajectory need to pay special attention to ensure the smallest messy capacitance. The input node is very sensitive to capacitive electrical resistance, especially when connecting to a high impedance circuit. Swiling capacitors can inject signals from no need to input high impedance input from the noise line. Protecting them by providing protective traces around high impedance input lines to protect them, which also significantly improves channel separation.

In addition, any amplifier capacitance of the input capacitor of the operation amplifier generates a pole in the frequency response of the circuit. The additional phase shift caused by this pole reduces the gain of the circuit. If this pole is within the gain range of the operation amplifier, it will lead to unstable performance. To reduce these adverse effects, minimum impedance is used as much as possible. Reducing the impedance of this node will make the polar point at a higher frequency, which is much higher than the gain range of the amplifier. The messy capacitors on the PCB can be reduced by making the trace line as narrow as possible. By selecting a smaller pad size, the distance between the increasing trace lines, and the use of PCB materials with a low -dielectric constant insulator (some common insulators dielectric constant: AIR u003d 1, Teflon #174; u003d 2.2 and FR4 u003d 4.7, air is an ideal insulator).

It is recommended to remove the ground section directly below the input and output pad.

The output of a high -speed amplifier is very sensitive to the capacitance load. The frequency response of the capacitance load to the circuit introduces a pair of pole and zero, which reduces the phase margin, resulting in unstable or oscillation of work.

GeneralIn terms of, by placing a resistor between the amplifier output and the remaining circuits, the output of the amplifier isolates the output of the amplifier with any capacitance load is a good design practice. The series resistors from 10Ω to 100Ω are usually enough to isolate the output from the capacitance load.

OP467 is an internal compensation to provide stable operation and can drive a large capacitance load without oscillation.

It is not recommended to use the socket because they increase the inductance/capacitance of the lead and reduce the power consumption of the packaging by increasing the thermal resistance of the lead. If you have to use the socket, use the most of the Iron Flong or the shortest lead.

Phase reversal

The input of OP467 is not affected by any phase reversal; the reverse diode of any phase can exceed.

saturation recovery time

OP467 has a fast and symmetrical recovery time. This feature is very useful in applications such as high -speed instruments and measuring circuits. In these applications, the amplifier is often exposed to large signals that make the amplifier overload.

High -speed instrument amplifier

OP467's performance is suitable for various high -speed applications, including high -speed precision instruments. Figure 44 shows circuits that are usually used for data collection, CCD imaging and other high -speed applications.

Circuit gain is set by RG. 2 KΩ resistor set the circuit gain to 2; for unit gain, remove RG. For any other gain settings, use the following formulas:

RC is used to adjust the DC co -model suppression, and the CC is used to exchange co -model suppression and adjustment.

2MHz Double Four Road Tibetan Filter

The circuit in FIG. 48 is usually used in medical imaging ultrasound receiving Instrument. The 30MHz bandwidth is sufficient to accurately generate a 2MHz center frequency, as shown in Figure 49. When the bandwidth of the op amp is too close to the center frequency of the filter, the internal phase movement of the amplifier will generate excessive phase shifts in 2MHz, thereby changing the response of the filter. In fact, if the bandwidth of the selected amplifier is close to 2 MM, the phase shift combination of the three computing amplifiers will cause the loop oscillation.

Like other high -speed circuits, the layout of the circuit must be carefully considered.

If the phase shift introduced in the layout is large enough, it will change the performance of the circuit, or worse, leading to an oscillation.

Quick I-V converter OP467's rapid conversion rate and fast stability time are very suitableFast buffer and I-V converter used in various applications.The circuit in FIG. 50 is a single four -mode DAC consisting of two ICs.The current output of the DAC8408 is converted from OP467 configured to I-TO-V converter to voltage.The circuit can stabilize to 0.1%within 200NS.Figures 51 and Figure 52 show the full standard stability time of the output.In order to obtain a reliable circuit performance, keep the short circuit from the DAC output to the OP467 inverter input terminal to minimize the parasitic capacitance.

Character size