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LMX2531 Datasheet(PDF) 7 Page - Texas Instruments

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No. de pieza LMX2531
Descripción Electrónicos  selecting amplifiers, adcs, and clocks for high-performance signal paths
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

LMX2531 Datasheet(HTML) 7 Page - Texas Instruments

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6
SIGNAL PATH
designer
of a CFB amplifier. For a Voltage Feedback (VFB)
amplifier, RB is set equal to the effective impedance
seen at the inverting input to cancel errors caused
by input-bias current. In the case of high RB values,
CB may be required to reduce high-frequency noise
due to the amplifier input-noise current flowing
through RB.
In the inverting-amplifier configuration, the ampli-
fier inputs are held at a fixed virtual ground while
in the non-inverting configuration, the inputs
see the full input-signal swing. Consequently, the
inverting-amplifier-input stage sees a much smaller
voltage on its inputs which reduces any distortion
introduced by the input stage.
In order to obtain the full performance, a differen-
tial-input ADC must be driven differentially. Figure
6a shows an integrated amplifier with differential
outputs and differential inputs. Capable of either
AC- or DC-coupled operation, the amplifier gain is
set by four external resistors per the equation given
in the diagram. The amplifier can also be driven by
a single-ended source, as in a single-to-differential
amplifier, with the unused amplifier input grounded
as shown in Figure 6b.
Resistors RF and RG should be well matched
and strict symmetry should be observed in PC-
board layout. This ensures optimum output
balance, necessary for low distortion, and good
Common Mode Rejection Ratio (CMRR) from
this circuit. The output common-mode level is set
by the VCM common-mode control, independently
of the input common-mode level, which is ideal for
level-shifting the amplifier input signal to match
the required ADC-input common-mode level. The
fully-differential amplifier can be thought of as two
forward-amplification channels plus a third feed-
back amplifier which senses the output common
mode of the two forward channels and servos it to
the level of the VCM pin. The VCM common-mode
feedback loop forces the two outputs to be equal
and opposite, thereby controlling the amplifier-
output balance even when only one input channel
is driven and the other input is grounded, as in the
single-to-differential amplifier application.
Setting the output common-mode voltage with
the VCM pin also affects the amplifier-input
common-mode voltage. It is essential to stay within
Figure 6a. Fully differential amplifier
VOUT
RF
RG
VIN
= -
RF
RG
AV
VCM
RG
RF
VO
Source
B2 =
R G + R M
RG + RF + R M
)
B1 =
R G
RG + RF
(
)
AV =
2(1-B 1)
B1 + B 2
(
)
RIN =
2R G + R M(1-B 2)
1 + B2
(
To match circuit input impedance RIN to source impedance RS, set
R T//R IN = R S, with R M = RS//R T then
AV, RIN
RT
RF
RF
RS
VIN
VCM
RM
RG
RG
(
)
Figure 6b. Single-ended input with differential output
Selecting Amplifiers, ADCs, and Clocks for High-Performance Signal Paths
RB
RF
RG
RS
(Optional)
CB (Optional)
Source
(
)
=
//
+
//
-
VOUT to
ADC
RF
RG
AV
RG
RG
RT
RS
RT
VIN
RT
Setting RS =RT //RG , gives AV = -
RF
2 RG
Figure 5b. Inverting single-ended amplifier
SignalPathDesigner.indd 6
SignalPathDesigner.indd 6
9/5/07 3:24:34 PM
9/5/07 3:24:34 PM


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