DRA790 Datasheet, PDF (376/436 Pages) Texas Instruments – Infotainment Applications Processor

DRA790, DRA791
DRA793, DRA797
SPRS968A – AUGUST 2016 – REVISED FEBRUARY 2017
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Table 7-1. Commercial Applications Recommended Decoupling Capacitors
Characteristics^(1)(2)(3) (continued)
Value Voltage [V] Package
Stability
Dielectric Capacitanc Temp Range Temp
e
[°C]
Sensitivity
Tolerance
[%]
REFERENCE
470nF
6,3
0201
Class 2
X5R
- / + 20% -55 to + 85 - / + 15 GRM033R60G474ME90
220nF
6,3
0201
Class 2
X5R
- / + 20% -55 to + 85 - / + 15 GRM033R60J224ME90
100nF
6,3
0201
Class 2
X5R
- / + 20% -55 to + 85 - / + 15 GRM033R60J104ME19
(1) Minimum value for each PCB capacitor: 100 nF.
(2) Among the different capacitors, 470 nF is recommended (not required) to filter at 5-MHz to 10-MHz frequency range.
(3) In comparison with the EIA Class 1 dielectrics, Class 2 dielectric capacitors tend to have severe temperature drift, high dependence of
capacitance on applied voltage, high voltage coefficient of dissipation factor, high frequency coefficient of dissipation, and problems with
aging due to gradual change of crystal structure. Aging causes gradual exponential loss of capacitance and decrease of dissipation
factor.
Recommended power supply decoupling capacitors main characteristics for automotive products are
shown in table below:
Table 7-2. Automotive Applications Recommended Decoupling Capacitors Characteristics
(1)(2)
Value
Voltage [V] Package
AEC-Q200
Dielectric Capacitance Temp
Temp
Tolerance Range [°C] Sensitivity
[%]
REFERENCE
22µF
10
1206
Yes
X7R
- / + 10% -55 to + 125 - / + 15 GCM31CR71A226KE02
10µF
10
0805
Yes
X7R
- / + 10% -55 to + 125 - / + 15 GCM21BR71A106KE22
4.7µF
10
0805
Yes
X7S
- / + 10% -55 to + 125 - / + 22 GCM21BC71A475KA73
2.2µF
6,3
0603
Yes
X7R
- / + 10% -55 to + 125 - / + 15 GCM188R70J225KE22
1µF
10
0402
Yes
X7S
- / + 10% -55 to + 125 - / + 22 GCM155C71A105KE38
470nF
10
0402
Yes
X7S
- / + 10% -55 to + 125 - / + 22 GCM155C71A474KE36
220nF
25
0603
Yes
X7R
- / + 10% -55 to + 125 - / + 15 GCM155R71A104KA55
100nF
10
0402
Yes
X7R
- / + 10% -55 to + 125 - / + 15 GCM155R71C104MA55
100nF
1.0μF
0.47μF
0.22μF
0.1μF
6.3
0201
Yes
10
3T-0805⁽³⁾
Yes
10
3T-0805⁽³⁾
Yes
10
3T-0805⁽³⁾
Yes
10
3T-0805⁽³⁾
Yes
X7S
- / + 10% -55 to + 125 - / + 15
GCM033C70J104K
- / + 20% -55 to + 125
NFM21HC105R1C3
- / + 20% -55 to + 125
NFM21HC474R1C3
- / + 20% -55 to + 125
NFM21HC224R1C3
- / + 20% -55 to + 125
NFM21HC104R1C3
(1) Minimum value for each PCB capacitor: 100 nF.
(2) Among the different capacitors, 470 nF is recommended (not required) to filter at 5-MHz to 10-MHz frequency range.
(3) 3T designates this as a "3-terminal, low inductance type package”.
7.3.3 Static PDN Analysis
One power net parameter derived from a PCB’s PDN static analysis is the Effective Resistance (Reff).
This is the total PCB power net routing resistance that is the sum of all the individual power net segments
used to deliver a supply voltage to the point of load and includes any series resistive elements (i.e. current
sensing resistor) that may be installed between the PMIC outputs and Processor inputs.
7.3.4 Dynamic PDN Analysis
Three power net parameters derived from a PCB’s PDN dynamic analysis are the Loop Inductance (LL),
Impedance (Z) and PCB Frequency of Interest (Fpcb).
• LL values shown are the recommended max PCB trace inductance between a decoupling capacitor’s
power supply and ground reference terminals when viewed from the decoupling capacitor with a
“theoretical shorted” applied across the Processor’s supply inputs to ground reference.
376 Applications, Implementation, and Layout
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