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ADS2807 Arkusz danych(PDF) 9 Page - Texas Instruments

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Numer części ADS2807
Szczegółowy opis  Dual, 12-Bit, 50MHz Sampling ANALOG-TO-DIGITAL CONVERTER
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI - Texas Instruments

ADS2807 Arkusz danych(HTML) 9 Page - Texas Instruments

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ADS2807
9
SBAS169B
www.ti.com
APPLICATION INFORMATION
THEORY OF OPERATION
The ADS2807 integrates two high-speed CMOS ADCs and
an internal reference. The ADCs utilize a pipelined con-
verter architecture consisting of eleven internal stages.
Each stage feeds its data into the digital error correction
logic, ensuring excellent differential linearity and no missing
codes at the 12-bit level. The output data becomes valid
after the rising clock edge (see Timing Diagram). The
pipeline architecture results in a data latency of 6 clock
cycles.
The analog input of the ADS2807 consists of a differential
track-and-hold circuit. The differential topology along with
tightly matched poly-poly capacitors produce a high level of
AC performance at high sampling rates and in some under-
sampling applications.
Both inputs (IN, IN) require external biasing using a com-
mon-mode voltage that is typically at the mid-supply level
(+VS/2).
DRIVING THE ANALOG INPUTS
The analog inputs of the ADS2807 are very high impedance
and should be driven through an R-C network designed to
pass the highest frequency of interest. This prevents high-
frequency noise in the input from affecting SFDR and SNR.
The ADS2807 can be used in a wide variety of applications
and deciding on the best performing analog interface circuit
depends on the type of application. The circuit definition
should include considerations of input frequency spectrum
and amplitude, single-ended or differential drive, and avail-
able power supplies. For example, communication (frequency
domain) applications process frequency bands not including
DC. In imaging (time domain) applications, the input DC
component must be maintained into the ADC. Features of
the ADS2807 include full-scale select (SEL), external refer-
ence, and CM output, providing flexibility to accommodate a
wide range of applications. The ADS2807 should be config-
ured to meet application objectives, while observing the
headroom requirements of the driving amplifiers, to yield the
best overall performance.
The ADS2807 input structure allows it to be driven either
single-ended or differentially. Differential operation of the
ADS2807 requires an in-phase input signal and a 180
° out-
of-phase part simultaneously applied to the inputs (IN, IN).
The differential operation offers a number of advantages
that, in most applications, will be instrumental in achieving
the best dynamic performance of the ADS2807:
• The signal swing is half of that required for the single-
ended operation and, therefore, is less demanding to
achieve while maintaining good linearity performance from
the signal source.
• The reduced signal swing allows for more headroom in the
interface circuitry and, therefore, a wider selection of the
best suitable driver op amp.
• Even-order harmonics are minimized.
• Improves the noise immunity based on the converter’s
common-mode input rejection.
Using 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 equal in
terms of their impedance and performance, except that
applying the signal to the complementary input (IN ) instead
of the IN input will invert the input signal relative to the output
code. For example, in the case when the input driver oper-
ates in inverting mode, using IN as the signal input will
restore the phase of the signal to its original orientation.
Time-domain applications may benefit from a single-ended
interface configuration and its reduced circuit complexity.
Driving the ADS2807 with a single-ended signal will result in
a reduction of the distortion performance, while maintaining
good signal-to-noise ratio (SNR). Employing dual-supply
amplifiers and AC-coupling will usually yield the best results,
while DC-coupling and/or single-supply amplifiers impose
additional design constraints due to their headroom require-
ments, especially when selecting the 3Vp-p input range.
However, single-supply amplifiers have the advantage of
inherently limiting their output swing to within the supply rails.
Alternatively, a voltage limiting amplifier, like the OPA688,
may be considered to set fixed-signal limits and avoid any
severe overrange condition for the ADC.
The full-scale input range of the ADS2807 is defined by the
reference voltages. For example, setting the range select
pin to SEL = LOW, and using the internal references
(REFT = +3.0V and REFTB = +2.0V), the full-scale range is
defined as: FSR = 2 • (REFT – REFB) = 2Vp-p.
The trade-off of the differential input configuration versus the
single-ended is its higher complexity. In either case, the
selection of the driver amplifier should be such that the
amplifier’s performance will not degrade the ADC’s perfor-
mance. The ADS2807 operates on a single power supply
that requires a level shift for ground-based bipolar input
signals to comply with its input voltage range requirements.
The input of the ADS2807 is of a capacitive nature and the
driving source needs to provide the current to charge or
discharge the input sampling capacitor while the track-and-
hold is in track mode. This effectively results in a dynamic
input impedance that depends on the sampling frequency.
In most applications, it is recommended to add a series
resistor, typically 20
Ω to 50Ω, between the drive source and
the converter inputs. This will isolate the capacitive input
from the source, which can be crucial to avoid gain peaking
when using wideband operational amplifiers. Secondly, it will
create a first-order, low-pass filter in conjunction with the
specified input capacitance of the ADS2807. Its cutoff fre-
quency can be adjusted even further by adding an external
shunt capacitor from each signal input to ground. The opti-
mum values of this R-C network depend on a variety of
factors that include the ADS2807 sampling rate, the selected
op amp, the interface configuration and the particular appli-
cation (time domain versus frequency domain). Generally,


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