Details, datasheet, quote on part number: 5962F9683201VCA
CategoryMultimedia => Video => Amplifiers
DescriptionRadiation Hardened, Dual, High Speed, Low Power Video Operational Amplifier With Output Disable
CompanyIntersil Corporation
DatasheetDownload 5962F9683201VCA datasheet
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Features, Applications

Radiation Hardened, Dual, High Speed, Low Power Video Operational Amplifier with Output Disable

The is a radiation hardened dual high speed, low power current feedback amplifier built with Intersil's proprietary complementary bipolar UHF-1 (DI bonded wafer) process. These devices are QML approved and are processed and screened in full compliance with MIL-PRF-38535. This amplifier features individual TTL/CMOS compatible disable controls, which when pulled low, reduce the supply current and force the output into a high impedance state. This allows easy implementation of simple, low power video switching and routing systems. Component and composite video systems also benefit from this op amp's excellent gain flatness, and good differential gain and phase specifications. Multiplexed A/D applications will also find the HS-1245RH useful as the A/D driver/multiplexer. Specifications for Rad Hard QML devices are controlled by the Defense Supply Center in Columbus (DSCC). The SMD numbers listed here must be used when ordering. Detailed Electrical Specifications for these devices are contained in SMD 5962-96832. A "hot-link" is provided on our homepage for downloading.


Electrically Screened to SMD # 5962-96832 QML Qualified per MIL-PRF-38535 Requirements MIL-PRF-38535 Class V Compliant Low Supply Current. 5.9mA (Typ) Wide -3dB Bandwidth.530MHz (Typ) High Slew Rate.1050V/s (Typ) Excellent Gain Flatness (to 50MHz). 0.11dB (Typ) Excellent Differential Gain. 0.02% (Typ) Excellent Differential Phase. 0.03 Degree (Typ) High Output Current.60mA (Typ) Individual Output Enable/Disable Output Enable / Disable Time. 160ns/20ns (Typ) Total Gamma Dose. 300kRAD(Si) Latch Up. None (DI Technology)


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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 321-724-7143 | Copyright Intersil Corporation 1999

Although a current feedback amplifier's bandwidth dependency on closed loop gain isn't as severe as that of a voltage feedback amplifier, there can be an appreciable decrease in bandwidth at higher gains. This decrease may be minimized by taking advantage of the current feedback amplifier's unique relationship between bandwidth and RF. All current feedback amplifiers require a feedback resistor, even for unity gain applications, and RF, in conjunction with the internal compensation capacitor, sets the dominant pole of the frequency response. Thus, the amplifier's bandwidth is inversely proportional to RF. The HS-1245RH design is optimized for at a gain of +2. Decreasing RF decreases stability, resulting in excessive peaking and overshoot (Note: Capacitive feedback will cause the same problems due to the feedback impedance decrease at higher frequencies). At higher gains the amplifier is more stable, so RF can be decreased in a trade-off of stability for bandwidth. The table below lists recommended RF values for various gains, and the expected bandwidth. For good channel-tochannel gain matching, it is recommended that all resistors (termination as well as gain setting) be 1% tolerance or better. Note that a series input resistor, on +IN, is required for a gain +1, to reduce gain peaking and increase stability.

Attention should be given to decoupling the power supplies. A large value (10F) tantalum in parallel with a small value (0.1F) chip capacitor works well in most cases. Terminated microstrip signal lines are recommended at the input and output of the device. Capacitance directly on the output must be minimized, or isolated as discussed in the next section. Care must also be taken to minimize the capacitance to ground seen by the amplifier's inverting input (-IN). The larger this capacitance, the worse the gain peaking, resulting in pulse overshoot and possible instability. To this end, it is recommended that the ground plane be removed under traces connected to -IN, and connections to -IN should be kept as short as possible.

Capacitive loads, such as an A/D input, or an improperly terminated transmission line will degrade the amplifier's phase margin resulting in frequency response peaking and possible oscillations. In most cases, the oscillation can be avoided by placing a resistor (RS) in series with the output prior to the capacitance. Figure 1 details starting points for the selection of this resistor. The points on the curve indicate the RS and CL combinations for the optimum bandwidth, stability, and settling time, but experimental fine tuning is recommended. Picking a point above or to the right of the curve yields an overdamped response, while points below or left of the curve indicate areas of underdamped performance. RS and CL form a low pass network at the output, thus limiting system bandwidth well below the amplifier bandwidth of 290MHz (for +1). By decreasing RS as CLincreases (as illustrated in the curves), the maximum bandwidth is obtained without sacrificing stability. Even so, bandwidth does decrease as you move to the right along the curve. For example, = 40pF, the overall bandwidth is limited to 180MHz, and bandwidth drops = 400pF.

For best operation, the D.C. source impedance looking out of the non-inverting input should be 50. This is especially important in inverting gain configurations where the noninverting input would normally be connected directly to GND.

The HS-1245RH derives an internal GND reference for the digital circuitry as long as the power supplies are symmetrical about GND. The GND reference is used to ensure the TTL compatibility of the DISABLE inputs. With symmetrical supplies the GND pin (Pin 12) may be floated, or connected directly to GND. If asymmetrical supplies (e.g. +10V, 0V) are utilized, and TTL compatibility is desired, the GND pin must be connected to GND.

The frequency response of this amplifier depends greatly on the amount of care taken in designing the PC board. The use of low inductance components such as chip resistors and chip capacitors is strongly recommended, while a solid ground plane is a must!


NOTES: 5%, 1/4W min (Per Socket) 5%, 1/4W min (Per Socket) = 0.01F (Per Socket) or 0.1F (Per Row) Minimum 1N4002 or Equivalent (Per Board) 1N4002 or Equivalent (Per Socket)


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