AD8307 DATASHEET PDF

It is extremely stable and easy to use, requiring no significant external components. A single-supply voltage of 2. The input is fully differential and at a moderately high impedance 1. D Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use.

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He used a PIC to convert the dBm readings back into watts and to calibrate the device, too. With that thought in mind, why not design a 0 - 60 dBm 1 milliwatt to watt power meter? It reads either dBm 1 - milliwatts or dBW 1 - watts. Yes, the scale is in milliamperes. The case was originally from a Drake W4 wattmeter.

I no longer recall where I found the case -- I must have picked it up sans meter and electronics at a swapmeet sometime in the past. I initially wanted to use a meter that was marked from 0 to mA actually a uA FS meter , because the scale would be perfect for a dBm meter without a range switch.

But I really wanted to avoid cutting a meter hole, so the mA meter won out. I also wanted to used op-amps with rail-to-rail outputs so that I could drive down to 0 volts. Fortunately, I happened to have some TLC op amps on hand.

The 1N is just there to provide circuit protection in case the wrong polarity DC is attached to the input. The Note, the 0. I built the sides of a small shielded box on the ground plane using copper-clad PC stock. Copper tape soldered to the box sides caps the box. Power and the output signal from the AD pass through the box via feedthrough caps 1nF, if I recall their value correctly. For the op amp to generate V for each of the two ranges, given that the AD output ranges from about 0.

The pot spans the same amount of voltage, but shifted, when the range switch is toggled because the total resistance in the voltage divider does not change. Note that changing ranges requires re-zeroing the meter. Two more op amps round out the design.

The first drives a 10 uF cap, which acts as a peak-hold with its "slow" decay determined by a parallel 1 Meg ohm resistor. This feature is useful when looking at peak-power. The op amp drives a 2N transistor which is in the feedback loop. By the way, I used 2N transistors because I have a bunch on hand. A switch allows selection of "slow" or "fast" decay of the peak-hold cap by switching in a 10K resistor to parallel the 1 Meg "slow" decay.

The other op amp drives the meter and isolates the peak-hold cap from the relatively low resistance represented by the meter. The ohm pot acts as a "Gain" control and it ensures that the reading of the analog front-panel meter correctly corresponds with the input power. A second 2N, in the feedback loop of this meter-drive op amp, provides current gain for the its TLC These op amps are a bit anemic with respect to current-drive, and their output voltage can drop appreciably with loading.

This device would allow you to eliminate both 2N transistors, with the 2N used for the peak detector replaced with a simple diode, e. Something else to try would be to replace the single "Zero" pot with two pots, each selected by the Range switch. Notes on Construction: I like to build on copper-clad PC stock because it provides a great ground plane for the circuitry and I have quite a bit of it in my junk box.

Pins going to ground are bent down and soldered to the copper plane. All other pins are bent out so that they are straight out from the sides of the IC like the wings of an airplane. The resistor sticks up straight and will support the side of an IC that has a pin soldered to to the top of the resistor. What I try to do for these is to purchase little prototyping boards designed to adapt specific SOIC packages e.

Ground , stiff wire. In the picture below the two small green boards are the prototyping boards for the two TLC packages. You can often find these on eBay. To make the front panel overlay I used the same technique that I describe here. In Operation: In the photo below the meter is reading 10 dBW i.

Only with an external 50 dB attenuator will the scale accurately reflect the actual power e. The table below shows how the measurement range would shift with different values of input attenuation. External 50 dBm Attenuator: As I mentioned earlier, this design requires some form of external attenuation for the dBm measurement range. Front-left: 50 watt dummy load with 50 dB attenuator. Front-right: homebrew dB directional coupler.

The 40 dB attenuator is just a voltage divider that divides the voltage at the dummy load e. To keep the frequency response flat over that range I had to add a capacitive "gimmick" to ground next to the series resistors -- essentially some copper tape tied to ground that I wrapped around the resistor bodies.

Note, too, that if driving the dummy load with watts of power, the 2. And to get 40 dB of attenuation there needs to be a 50 ohm load e. For a given dB range, multiply the milliwatt reading by the appropriate power of For example: For the range dBm, multiply "milliwatts" by 1 For the range dBm, multiply "milliwatts" by 10 For the range dBm, multiply "milliwatts" by So, if a reading is 11 dBm, the power would be 13 milliwatts.

Similarly, 21 dBm would be milliwatts. If the Range switch is set to 30 dBW, then "milliwatts" is replace by "watts", and a meter reading of, say, 11 dBW would correspond to 13 watts.

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AD8307 Analog Devices, AD8307 Datasheet

It is extremely stable and easy to use, requiring no significant external components. A single-supply voltage of 2. The input is fully differential and at a moderately high impedance 1. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use.

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Chinese AD8307 power measurement module #1

Above is a table describing its performance. Though I cannot reach the Chinese column headings, it would appear that the claimed response is fairly flat from 1 to MHz. How does it stack up? Is it faulty or is it by design? After considerable pushing, I did get a schematic from the seller along with a repeat of the table above. Unfortunately, the document is in Chinese.

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AD8307-EB Analog Devices Inc, AD8307-EB Datasheet

The model number is a specific version of a generic that can be purchased or sampled. Status Status indicates the current lifecycle of the product. This can be one of 4 stages: Pre-Release: The model has not been released to general production, but samples may be available. Production: The model is currently being produced, and generally available for purchase and sampling. Last Time Buy: The model has been scheduled for obsolescence, but may still be purchased for a limited time.

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He used a PIC to convert the dBm readings back into watts and to calibrate the device, too. With that thought in mind, why not design a 0 - 60 dBm 1 milliwatt to watt power meter? It reads either dBm 1 - milliwatts or dBW 1 - watts. Yes, the scale is in milliamperes. The case was originally from a Drake W4 wattmeter. I no longer recall where I found the case -- I must have picked it up sans meter and electronics at a swapmeet sometime in the past. I initially wanted to use a meter that was marked from 0 to mA actually a uA FS meter , because the scale would be perfect for a dBm meter without a range switch.

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