Selecting resistor R2 and potentiometer Rp depends on VOUT trim target. I have designed ADR425 user trim model which can be used to determine value of R2 and Rp based on desired VOUT. For examples, selecting R2=98.5k and Rp=7.5k trims output range…
ADR425 data-sheet page 13 figure 22 shows Load Current Vs Differential Voltage (Vin- Vout) plot. Please note based on ADR425 load regulation specification, ADR425 can only source up to 10mA.
If requirement for VREF is to source 20mA and support…
Attached is ADR425 user trim model which shows example of trimming VREF to + - 10mV (5.10mV to 4.99mV).
Nominal resistor values only. Does not cover worst case. 25*C only.
The datasheet (Fig 40, pg 18) is unclear as to the values for R2 and Rp. Are they the same value?
You can use switch to avoid the two references being connected to the pin at the same time. I advise you to use a switch that will provide minimal drop when "on" . And if the AD5317R is the only load for the ADR425, then it is best to connect the…
The TRIM input must be left floating if it is not being used to trim the output. It should not be connected to ground.
The ADR421 has a 2.5V output at 25'C, with a temperature coefficient limit of 10ppm/'C (or 25uV/'C). So, for an increase to 85'C (a…
Question is regarding the Electrical Specifications of the ADR425B (b-grade).The initial Accuracy of 0.04% (2mV) has a note "initial accuracy does not include shift due to solder heat effect"This 'solder heat effect shift' is not specified…
Hi Chris, thanks for your quick reply.
I've sketched out something in NI Multisim:
500uA Howland current-source with a ADR425 or similar reference. Could maybe use a matched resistor…