The TPS7A47 Eval Board
Just got in the evaluation board for the new TI ultra low noise regulator, the TI TPS7A4700
I would consider this a real bargain for audio diy at $20 including shipping. In came in a huge box and it was shipped Federal Express in an even bigger box. I think TI should cut the shipping cost and pass the savings to the customers. But I suppose it is more important for business customers to get it on time and without damage than saving a few bucks.
Here are some photos
Here are the packaging and shipping boxes. I did a quick check on on the FedEx site for shipping cost for a FedEx box: $17.67. You are basically getting the board for free!
Data sheet of device: [link]
Data sheet of Eval Board: [link]
OUTPUT VOLTAGE SELECTION
Output voltage selection is done by shorting jumpers. The resultant output corresponds to the addition of the internal voltage reference (1.4 v) and the voltages indicated by the jumpers.
The board clearly labels how to select the output voltage:
Internally, the jumpers just change the value of the voltage divider resistor as shown by the diagram below. Certainly much cheaper than implementing a potentiometer.
The TI “7A47″ has half the RMS noise as the ADP-150 at 4.17 uV RMS. (The dotted blue line is the noise plot for a 5V LT1763. Compare that to the noise plot for Vout=5v -blue solid line)
Compare the above noise plot with that of the ADP-150 shown below