ADA4530-1ARZ-R7 datasheet(38/52 Pages) AD

38 / 52 page

Data Sheet

ADA4530-1

HIGH IMPEDANCE MEASUREMENTS

analog.com

Rev. C | 38 of 52

Figure 115. TIA Circuit with Contamination Battery

CLEANING AND HANDLING

The contamination described in the Contamination section can be

removed by an appropriate cleaning process. Vapor degreasing and

cleaning solvents such as n-Propyl Bromide (nPB) are effective at

removing residues from solder fluxes, oil, and grease contaminants.

Insulators that are severely contaminated benefit from mechanical

abrasion in addition to the solvent. Vapor degreasers are highly

effective. Scrubbing the area around the high impedance insulators

with an acid brush also works.

The residual moisture must completely evaporate before the insula-

tor can be used. nPB solvents dry up quickly and compressed dry

air (CDA) is enough for drying, but the boards can still be subjected

to the baking process if needed.

For detailed cleaning and handling procedures, refer to the

ADA4530-1R-EBZ user guide.

SOLDER PASTE SELECTION

Solder paste selection can drastically impact the performance of

the board if not cleaned properly. Solder flux residue on a PCB

degrades the low IB performance of the amplifier. An experiment

was performed to evaluate the cleaning procedure for different

solder paste types. Table 7 shows the result of the experiment. The

recommended cleaning procedure column lists the times required

to restore the effective input bias currents to less than 1 fA. The

suggested solder paste of choice is the RMA type.

Table 7. Recommended Cleaning Procedures for Different Solder Paste Material

Solder Paste Type

Solder Paste Part Number

Recommended Cleaning Procedure1

RMA

AIM RMA258-15R

15 min clean time in an ultrasonic cleaner with fresh IPA, followed by 1.5 hours of bake time at 125°C

Water Soluble

SAC305 Shenmao

1.5 hours clean time in an ultrasonic cleaner with fresh IPA, followed by 1.5 hours of bake time at 125°C

No Clean

SAC 305 AMTECH LF4300

3 hours clean time in an ultrasonic cleaner with fresh IPA, followed by 3 hours of bake time at 125°C

1 Bake time was not optimized and was set equal to the cleaning time.

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