DAC37J84 Datasheet, PDF (109/122 Pages) Texas Instruments – Digital-to-Analog Converters

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DAC37J84, DAC38J84
SLASE17B – JANUARY 2014 – REVISED MARCH 2014
9 Power Supply Recommendations
The DAC37J84 and DAC38J84 use three different power supply voltages. Some of the DAC power supplies are
noise sensitive. The table below is a summary of the various power supply of the DAC. Care should be taken to
keep clean power supplies routing away from noisy digital supplies. It is recommended to use at least two power
layers. Avoid placing digital supplies and clean supplies on adjacent board layers and use a ground layer
between noisy and clean supplies if possible. All supplies terminals should be decoupled as close to the
terminals as possible using small value capacitors, with larger bulk capacitors placed further away.
POWER SUPPLY
VDDADAC33
VDDAPLL18
VDDAREF18
VDDCLK09
VDDDAC09
VDDDIG09
VDDIO18
VDDR18
VDDS18
VDDT09
VQPS18
VOLTAGE
3.3 V
1.8 V
1.8 V
0.9 V
0.9 V
0.9 V
1.8 V
1.8 V
1.8 V
0.9 V
1.8 V
NOISE SENSITIVE?
Yes
Yes
Yes
Yes
Yes
No
No
Yes
No
Yes
No
RECOMMENDATION
Provide clean voltage, avoid
spurious noise
Provide clean voltage, avoid
spurious noise
Provide clean voltage, avoid
spurious noise
Provide clean voltage, avoid
spurious noise
Provide clean voltage, avoid
spurious noise
Digital supply, keep separated
from noise sensitive 0.9 V
supplies.
No concern
Provide clean voltage
No concern
Provide clean voltage
No concern
Copyright © 2014, Texas Instruments Incorporated
Product Folder Links: DAC37J84 DAC38J84
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