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LTC1407-1 Fiches technique(PDF) 13 Page - Linear Technology

No de pièce LTC1407-1
Description  Serial 12-Bit/14-Bit, 3Msps Simultaneous Sampling ADCs with Shutdown
Download  24 Pages
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Fabricant  LINER [Linear Technology]
Site Internet  http://www.linear.com
Logo LINER - Linear Technology

LTC1407-1 Fiches technique(HTML) 13 Page - Linear Technology

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13
LTC1407-1/LTC1407A-1
14071f
LT1818/LT1819: 400MHz, 2500V/
µs, 9mA, Single/Dual
Voltage Mode Operational Amplifier.
LT6200: 165MHz GBWP, –85dBc distortion at 1MHz,
unity gain stable, rail-to-rail in and out, 15mA/amplifier,
0.95nV/
√Hz.
LT6203: 100MHz GBWP, –80dBc distortion at 1MHz,
unity gain stable, rail-to-rail in and out, 3mA/amplifier,
1.9nV/
√Hz.
LT6600: Amplifier/Filter Differential In/Out with 10MHz
Cutoff.
INPUT FILTERING AND SOURCE IMPEDANCE
The noise and the distortion of the input amplifier and
other circuitry must be considered since they will add to
the LTC1407-1/LTC1407A-1 noise and distortion. The
small-signal bandwidth of the sample-and-hold circuit is
50MHz. Any noise or distortion products that are present
at the analog inputs will be summed over this entire band-
width. Noisy input circuitry should be filtered prior to the
analog inputs to minimize noise. A simple 1-pole RC filter
is sufficient for many applications. For example, Figure 1
shows a 47pF capacitor from CHO+ to ground and a 51
source resistor to limit the net input bandwidth to 30MHz.
The 47pF capacitor also acts as a charge reservoir for the
input sample-and-hold and isolates the ADC input from
sampling-glitch sensitive circuitry. High quality capaci-
tors and resistors should be used since these components
APPLICATIO S I FOR ATIO
can add distortion. NPO and silvermica type dielectric
capacitors have excellent linearity. Carbon surface mount
resistors can generate distortion from self heating and
from damage that may occur during soldering. Metal film
surface mount resistors are much less susceptible to both
problems. When high amplitude unwanted signals are close
in frequency to the desired signal frequency a multiple
pole filter is required.
High external source resistance, combined with 13pF of
input capacitance, will reduce the rated 50MHz input band-
width and increase acquisition time beyond 39ns.
INPUT RANGE
The analog inputs of the LTC1407-1/LTC1407A-1 may be
driven fully differentially with a single supply. Either input
may swing up to 3V, provided the differential swing is no
greater than 1.25V. In the valid input range, each input of
each channel is always up to
±1.25V away from the other
input of each channel. The –1.25V to 1.25V range is also
ideally suited for AC-coupled signals in single supply
applications. Figure 2 shows how to AC couple signals in
a single supply system without needing a mid-supply 1.5V
DC external reference. The DC common mode level is
supplied by the previous stage that is already bounded by
single supply voltage of the system. The common mode
range of the inputs extends from ground to the supply
voltage VDD. If the difference between the CH0+ and CH0
inputs or the CH1+ and CH1inputs exceeds 1.25V, the
output code will stay fixed at zero and all ones, and if this
difference goes below –1.25V, the ouput code will stay
fixed at one and all zeros.
Figure 1. RC Input Filter
LTC1407-1/
LTC1407A-1
CH0+
CH0
VREF
GND
14071 F01
1
2
11
3
10
µF
47pF*
51
Ω*
CH1+
CH1
4
5
47pF*
*TIGHT TOLERANCE REQUIRED TO AVOID
APERTURE SKEW DEGRADATION
51
Ω*
ANALOG
INPUT
ANALOG
INPUT
VCM
1.5V DC
VCM
1.5V DC
CHO+
4.09V
C4
10
µF
14071 F02
R2
1.6k
C2
1
µF
C1
1
µF
C1, C2: FILM TYPE
C3: COG TYPE
C4: CERAMIC BYPASS
R1
1.6k
1
2
3
LTC1407-1/
LTC1407A-1
CHO
VREF
R3
51
C3
56pF
VIN
Figure 2. AC Coupling of AC Signals with 1kHz Low Cut


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