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ADS5120CGHK Datasheet(PDF) 11 Page - Texas Instruments

Part # ADS5120CGHK
Description  8-Channel, 10-Bit, 40MSPS, 1.8V CMOS ANALOG-TO-DIGITAL CONVERTER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

ADS5120CGHK Datasheet(HTML) 11 Page - Texas Instruments

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ADS5120
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For the single-ended mode, the signal is applied to one of the
inputs while the other input is biased with a DC voltage to the
required common-mode level. Both inputs are identical in
terms of their impedance and performance. Applying the
signal to the complementary input (AIN–) instead of the AIN+
input, however, will invert the orientation of the input signal
relative to the output code. This could be helpful, for ex-
ample, if the input driver operates in inverting mode using
input AIN– as the signal input will restore the phase of the
signal to its original orientation.
INPUT DRIVER CONFIGURATIONS
Transformer-Coupled Interface
If the application requires a signal conversion from a single-
ended source to drive the ADS5120 differentially, a RF-
transformer might be a good solution. The selected trans-
former must have a center tap in order to apply the common-
mode DC voltage necessary to bias the converter inputs. AC-
grounding the center tap will generate the differential signal
swing across the secondary winding. Consider a step-up
transformer to take advantage of signal amplification without
the introduction of another noise source. Furthermore, the
reduced signal swing from the source may lead to an im-
proved distortion performance.
The differential input configuration may provide a noticeable
advantage of achieving good SFDR performance over a
wide range of input frequencies. In this mode, both inputs
(AIN+ and AIN–) of the ADS5120 see matched impedances.
Figure 2 shows the schematic for the suggested transformer-
coupled interface circuit. The component values of the R-C
low-pass may be optimized depending on the desired roll-off
frequency.
Single-Ended, AC-Coupled Driver
The circuit of Figure 3 shows an example for driving the
inputs of the ADS5120 in a single-ended configuration. The
signal is AC-coupled between the driver amplifier and the
converter input (AIN+). This allows for setting the required
common-mode voltages for the ADC and op amp separately.
The single-supply op amp is biased at mid-supply by two
resistors connected at its noninverting input. Connecting
each input to the CML pin provides the required common-
mode voltage for the inputs of the ADS5120. Here, two
resistors of equal value ensure that the inputs see closely
matched source impedances. If the op amp features a
disable function, it could be easily tied together with the
power-down pin of the ADS5120 channel (STBY). In the
circuit example depicted in Figure 3, the OPA355’s EN pin is
FIGURE 2. Converting a Single-Ended Input Signal into a Differential Signal Using a RF-Transformer.
R
IN
R
IN
C
IN
0.1
µF
R
T
0.1
µF
1:n
R
S
OPA690
R
1
R
2
V
IN
ADS5120
AIN+
AIN–
CML
–5V
+5V
OPA355
V
IN
R
F
604
R
G
604
1.82k
1.82k
ADS5120
R
S
24
EN
18pF
0.1
µF
0.1
µF
R
1
AIN+
STBY
CML
AIN–
0.1
µF
0.1
µF
R
2
+3V/+5V
FIGURE 3. Single-Ended, AC-Coupled Driver Configuration for Single Supply.


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