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ADS5221 Datasheet(PDF) 10 Page - Texas Instruments

No. de pieza ADS5221
Descripción Electrónicos  12-Bit, 65MSPS Sampling, 3.3V ANALOG-TO-DIGITAL CONVERTER
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

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ADS5221
10
SBAS262A
www.ti.com
INPUT COMMON-MODE VOLTAGE
The ADS5221 operates from a single +3.3V supply, and
requires a external common-mode voltage. This allows a
symmetrical signal swing while maintaining sufficient head-
room to the supply rail. The common-mode voltage can be
from an external DC voltage source, for example, an analog
+3.3V supply with a simple resister divider, or from the input
signal source with DC-coupling. When it is a single-ended
input configuration, the common-mode voltage is typically
+1.25V. When the input configuration is differential, the
common-mode voltage is +1.5V.
INPUT FULL SCALE RANGE
The input full-scale range (FSR) of the ADS5221 is select-
able from +1V to +2V and any value within this range, by
setting the reference select pin RSEL and reference voltage
pin VREF (see Table I). The input FSR (differential) is always
twice VREF (the voltage at the VREF pin) for all reference
modes.
By choosing different signal input ranges, trade-offs can be
made between noise and distortion performance. For maxi-
mizing SNR, the maximum signal input 2VPP range may be
selected. This range may also be selected for low-level
(–6dBFS to –40dBFS) but high-frequency multi-tone input.
The signal distortion at the output of the device could be
sensitive to the input signal with large full-scale. Reducing
signal amplitude will improve the distortion performance. The
large input signal amplitude of the converter will impose
additional design constraints to the op amp due to its head-
room requirements when the op amp is from single-supply
and DC-coupling.
DIFFERENTIAL INPUTS
The ADS5221 input structure is designed to accept both a
single-end or differential analog signal. Distortion perfor-
mance, however, can be improved by utilizing the differential
input configuration. Differential operation of the ADS5221
requires that an input signal at the inputs (IN, IN) has the
same amplitude and is 180 degrees out-of-phase. Differen-
tial signals offer a number of advantages:
• The signal amplitude is half that required for the single-
ended operation, and is therefore less demanding to achieve,
while maintaining good linearity performance from the
signal source.
• The reduced signal swing allows for more headroom of the
interface circuitry, and therefore also allows a wider selec-
tion of the best suitable driver amplifier.
• Minimization of even-order harmonics.
• Improved noise immunity based on the common-mode
input rejection of the converter.
ANALOG INPUT DRIVEN BY TRANSFORMER
The ADS5221 can be driven by a transformer, which pro-
vides signal AC-coupling and allows a signal conversion from
single-ended input to differential output, or from single-ended
input to single-ended output. Using a transformer offers a
number of advantages. As a passive component, it does not
add to the total noise and has better harmonics in wide
frequency bands, compared to an op amp driver. By using a
step-up transformer, further signal amplification can be real-
ized; as a result, the signal swing from the source can be
reduced. For transformer selection, it is important to carefully
examine the application requirements and determine the
correct model, the desired impedance ratio, and frequency
characteristics. Furthermore, the appropriate model must
support the targeted distortion level and should not exhibit
any core saturation at full-scale voltage levels. A variety of
miniature RF transformers from different manufacturers, (such
as, Mini-Circuits, Coilcraft, or Trak) can be selected.
Figure 3 shows a transformer-coupled input configuration of
the ADS5221. The ADS5221 receives a differential AC signal
from the output of the transformer and common-mode volt-
age of +1.5V from the center tap. A source termination
resistor, RT , is required, which can be placed at the input or
output of the transformer to satisfy the termination require-
ments of the source impedance, RS. The circuit also shows
the use of an additional RC low-pass filter placed in series
with each converter input to attenuate some of the wideband
noise. The resistor values are typically in the range of 10
Ω to
50
Ω, and capacitors are in the range of 10pF to 100pF for
individual application requirements.
FIGURE 3. Transformer-Coupled Differential Input Configura-
tion of ADS5221.
ADS5221
24.9
24.9
22pF
IN
IN
0.1
µF
R
S
R
T
T4-6T
1.7k
1.5k
1.5V
AV
DD
3.3V


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