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PE Datasheet (data sheet) PDF
Changing attenuation state control values will change device state to new attenuation. Direct Mode is ideal for manual control of the device using hardwire, switches, or jumpers.
Table 5. The Data and Clock inputs allow data to be serially entered into the shift register, a process that is independent of the state of the LE input.
PE PDF DATASHEET
The LE input controls the latch. The shift register should be loaded while LE is held LOW to prevent the attenuator value from changing as data is entered. This feature exists for both the Serial and Parallel modes of operation, and allows a known attenuation state to be established before an initial serial or parallel control word is provided.
This allows any one of the 64 attenuation settings to be specified as the power-up state.
Table 6. Page 6 of 11 Document No. If use of the internal negative voltage generator is desired, then connect —VDD Black banana plug to ground. If an external —VDD is desired, then apply -3V. J1 should be connected to the parallel port of a PC with the supplied ribbon cable.
Using the software, enable or disable each attenuation setting to the desired combined attenuation. The software automatically programs the DSA each time an attenuation state is enabled or disabled. To evaluate the Power Up options, first disconnect the parallel ribbon cable from the evaluation board.
The parallel cable must be removed to prevent the PC parallel port from biasing the control pins. Figure Page 7 of 11 Figure Serial programming sections of the functional pattern are clocked at 10 MHz to verify fclk specification.
Page 8 of 11 Table 9. Y5P0 TYP 0.
Dimension applies to metallized terminal and is measured between 0. Coplanarity applies to the exposed heat sink slug as well as the terminals. Dimensions are in millimeters. Page 9 of 11 Figure Tape and Reel Drawing Table Page 10 of 11 Document No.
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The data sheet contains design target specifications for product development. Specifications and features may change in any manner without notice.
Preliminary Specification The data sheet contains preliminary data. Additional data may be added at a later date. Peregrine reserves the right to change specifications at any time without notice in order to supply the best possible product. Product Specification The data sheet contains final data. In the event Peregrine decides to change the specifications, Peregrine will notify customers of the intended changes by issuing a DCN Document Change Notice.
The information in this data sheet is believed to be reliable. However, Peregrine assumes no liability for the use of this information. No patent rights or licenses to any circuits described in this data sheet are implied or granted to any third party.
The control logic interface provides parallel control inputs along the bottom and serial control inputs centre left. That actually gives the PE three different ways of setting the attenuation level. Setting attenuation The first way of setting attenuation level is via direct parallel programming, where you apply logic-level siliconchip. The second mode is latched parallel programming, where the control signals are still applied to the CC0. By varying the logic levels on these pins you can ensure that the chip powers up at 0dB attenuation insertion loss only , 8dB, 16dB or 31dB, or whatever attenuation is programmed by pins CC0.
PE PDF Datasheet浏览和下载
The RF input connector is coupled to pin 2 of IC1 via a nF capacitor, while the output is taken from pin 14 to the RF output connector via another nF capacitor. It would not be easy to change this, if you wanted to use serial mode instead of parallel programming. The C16 1 programming pin is connected in a similar fashion to pin V6 of CON1, although not directly but via a series 10kW resistor.
Putting it to use The simplest way to control this module is to use a 6-pole DIP switch, as shown in Fig. The truth table to the right of Fig. You could use a similar approach to control the module directly from a micro, like an Arduino or a Micromite.
Then it would be a matter of writing a program to control the attenuator module via these six pins. Unfortunately, as noted, the module is hard-wired for parallel programming, with the serial interface effectively disabled. The table below shows some of the switch combinations and the resultant attenuation settings. At bottom right is the format of the byte to be sent from the micro to the PE to activate each attenuator. These modules are intended to adapt a parallel-interface LCD module for serial interfacing and they often come mated with an LCD.
The upper part of the diagram shows the circuitry inside the piggyback module, while the PE module is shown at lower right, with the interconnections all made via the pin header which usually connects to the LCD module. The six programming lines pass through IC2, a 74HC hex non-inverting buffer. This is needed because the outputs from IC1 can only provide very low current in their high logic state but the V1-V6 inputs of the step attenuator module are all fitted with 10kW pulldown resistors.
This means that they tend to draw more current than the outputs of IC1 can provide. Alternatively, you could leave out the 74HC and simply remove the six pull-down resistors from the underside of the module.
Note that because the PE chip must be connected to a 3. As shown in Fig. As a result, to program the attenuator correctly you simply need to send it the six control bits embedded in a single byte as shown at bottom right. Note that bits B3 and B7 are not used and can be left at either zero or one. Because of the larger number of possible attenuation factors, this inevitably took rather long, even though I elected to do measurements for only 12 of the 64 combinations of programming bits.
But I did take measurements at eight different frequencies, at MHz, 1. Note that the measurements were taken at nominal attenuation factors of 0dB ie, insertion loss only , The results are quite close to the nominal values shown in the left-hand column of Table 1.Table 5.
The data sheet contains design target specifications for product development. The parallel cable must be removed to prevent the PC parallel port from biasing the control pins. Putting it to use The simplest way to control this module is to use a 6-pole DIP switch, as shown in Fig. Peregrine assumes no liability for damages, including consequential or incidental damages, arising out of the use of its products in such applications.
Unique power-up state selection? The software automatically programs the DSA each time an attenuation state is enabled or disabled. This functionality is delivered in a 4x4 mm QFN footprint.
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