From the user's guide of the TSW3082 and DAC5682z EVM:
1.Can i use the chip of the DAC5670 replace the chip DAC5682Z,and use the same network between the
DAC5682Z and TRF3703-33?
From the datasheet about the DAC5682Z, i find that "BIASJ: Full-scale output current bias.For 20mA full-scale output current,connecta 960Ohm resistor to GND."
I have some question i can not understand.
1.Is the full-scale output current meant to the IOUTFS?
2.To reach to the 20mA full-scale output current, how to calculate the value of the Rbias?
3."The default full-scale output current equals 16times this bias current and can thus be expressed as: IOUTFS=16×IBIAS=16×VEXTIO/ RBIAS". Is the voltage of VEXTIO 1.2v ?
Hi Lei,
The DAC5682z and DAC5670 has the same level of output compliance voltage range (AVDD +/-0.5V). Therefore, you can use the same network for the DAC5682z and TRF3703-33. Note the two devices are not pin-compatible.
Regarding the other questions.
1. Yes, full-scale output current is the same as IOUTFS
2. you can use the equation IOUTFS = 16xVEXTIO/RBIAS. With VEXTIO = 1.2V for internal reference and max full-scale current of 20mA, the RBIAS is set to be 960ohm.
3. VEXTIO = 1.2V nominal for both internal and external reference mode.
-KH