ltc2978 Linear Technology Corporation, ltc2978 Datasheet - Page 59

• Manufacturer Part Number: ltc2978
• Description: Octal Pmbus Power Supply Monitor And Controller With Eeprom
• Manufacturer: Linear Technology Corporation

applicaTions inForMaTion
Antialiasing Filter Considerations
Extremely noisy environments may require an antialiasing
filter on the input to the LTC2978’s ADC. The R-C circuit
shown in Figure 19 is adequate for most situations. Keep
4.5V < V
IBUS
< 15V
V
0.1µF
0.1µF
IN
V
V
V
V
PWR
DD33
DD33
DD25
Figure 19. Antialiasing Filter on V
LTC2978*
GND
V
V
V
SENSEM0
V
SENSEP0
OUT_EN0
V
V
IN_SNS
DACM0
DACP0
*SOME DETAILS OMITTED FOR CLARITY
ONLY ONE OF EIGHT CHANNELS SHOWN
C10
C20
R40 = R50 ≤ 200Ω to minimize ADC gain errors, and select
a value for capacitors C10 and C20 that doesn’t add too
much additional response time to the OV/UV supervisor,
e.g. τ ≅ 10µs (R = 100Ω, C = 0.10µF).
R40
R50
SENSE
LOAD
Lines
R20
R10
R30
V
V
V
SGND
RUN/SS
IN
OUT
CONVERTER
FB
DC/DC
GND
2978 F09
LTC2978

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