number of logic gates transistors used

Q We would like to know the number of logic gates / transistors used in AD1528 A there are 52 for AD1582.

AD1582: Requirements for heat sinking

Q I want to know if i will need a heat sink for this device (Vin=3.3V and Iout=100uA). Therefore, i need to know what are the Tj, Tjunction-ambient and Tjunction-case. can you send me those parameters? A The thetaJA for the sot 23 package used by the AD1582 is 300degC/W. A max junction temperature of 125degC is a good assumption for this device. Total power consumption is 3.3V x 65uA + (3.3V – 2.5V) x 100uA = 214uW + 80uW = 280uW Expected junction temperature rise above ambient = 300degC/W x 280uW = 0.08degC As you can see the power dissipation in the AD1582 even when sourcing 100uA is so low that the rise in junction temperature will be less than 1degC. A heat sink should not be required in such conditions. As an aside, note that the thetaJA we quote on the datasheet (usually found in the absolute maximum ratings sections) uses a “SEMI standard board” under still air conditions according to SEMI standard G38-87. This assumes a large copper area ground plane approx 2inch x 2 inch which acts as a heat sink. The area of adjacent ground plan and the width of PCB track which used to connect the component pad can all affect the thermal resistance of the package.

The AD1582 does only show some mV (24mV - 60mV)at the Output.

Q The AD1582 does only show some mV (24mV - 60mV)at the Output. A A C (Capacitor) between Vout and GND is mandatory required for the Reference to work. A minimum C is not specified in the datasheet - I tested it with 100nF - it worked for me but I cannot gurantee that this 100nF is enough for all AD1582 to work. It all has to do with the difference between emitter followers and common emitter configurations, higher Ft NPNs vs. slow PNPs and phase shift. http://www.national.com/assets/en/appnotes/techedge_jul2002.pdf#page=1 http://www.national.com/assets/en/appnotes/f10.pdf#page=1 http://www.ti.com/lit/an/snva020a/snva020a.pdf#page=2

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AD1582 Production
The AD1582/AD1583/AD1584/AD1585Â are low cost, low power, low dropout, precision band gap references. These designs are available as 3-terminal (series...
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