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| LMP8350_14 Datasheet, PDF (22/31 Pages) National Semiconductor (TI) – LMP8350 Ultra Low Distortion Fully Differential Precision ADC Driver with Selectable Power Modes | |||
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LMP8350
SNOSB80B â FEBRUARY 2011 â REVISED MARCH 2013
www.ti.com
RF
RO
RS
a VI
RG
VI1
+
RT VOCM
-
RG VI2
RM
VO1
CL
RL VO
VO2
VO1 + VO2
*VCM =
2
*BY DESIGN
RO
RF
EN
(RG + RM)
VICM = VOCM * (RG + RM + RF) = a
VOCM
1 + AV
WHERE RM << RG
Figure 33. Relating AV to Input/Output Common Mode Voltages
In Figure 33 the differential closed loop gain is = AV= RF/RG. Please note that in single ended to differential
operation VIN is measured single ended while VOUT is measured differentially. This means that gain is really one-
half, or 6 dB, less when measured on either of the output pins separately.
RF
RO
RS
a VI
RG
RT VOCM
RG
RM
VI1
+
-
VI2
VO1
CL RL VO
VO2
RO
RF
EN
VO1 + VO2
*VCM =
2
*BY DESIGN
VICM = VOCM
VI1 + VI2
VICM =
2
Figure 34. AC Coupled for Single Supply Operation
POWER SUPPLY AND VOCM BYPASSING
The LMP8350 requires supply bypassing capacitors as shown in Figure 35 and Figure 36 for fastest settling time
and overall stability.
22
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