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LTC2360/LTC2361/LTC2362
17
236012fa
Input Filtering and Source Impedance
The noise and the distortion of the input amplier and
other circuitry must be considered since they will add to
the LTC2360/LTC2361/LTC2362 noise and distortion. The
small-signal bandwidth of the sample-and-hold circuit is
10MHz. Any noise or distortion products that are pres-
ent at the analog inputs will be summed over this entire
bandwidth. Noisy input circuitry should be ltered prior
to the analog inputs to minimize noise. A simple 1-pole
RC lter is sufcient for many applications. For example,
Figure 14 shows a 220pF capacitor from AIN to ground
and a 51
Ω source resistor to limit the input bandwidth
to 10MHz. The 220pF 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 capacitors and resistors should be used since these
components 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
lm 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 lter is required. High external source
resistance, combined with the 20pF of input capacitance,
will reduce the rated 10MHz bandwidth and increase
acquisition time beyond 500ns.
APPLICATIONS INFORMATION
Reference Input
On the TS8 package of the LTC2360/LTC2361/LTC2362,
the voltage on the VREF pin denes the full-scale range
of the ADC. The reference voltage can range from VDD
down to 1.4V.
Input Range
The analog input of the LTC2360/LTC2361/LTC2362 is
driven single-ended with respect to GND from a single
supply. The input may swing up to VDD for the S6 package
and to VREF for the TS8 package. The 0V to 2.5V range is
also ideally suited for single-ended input use with VDD or
VREF = 2.5V for single supply applications. If the difference
between the AIN input and GND exceeds VDD for the S6
package or VREF for the TS8 package, the output code will
stay xed at all ones, and if this difference goes below 0V,
the output code will stay xed at all zeros.
Figure 15 shows the ideal input/output characteristics for
the LTC2360/LTC2361/LTC2362. The code transitions oc-
cur midway between successive integer LSB values (i.e.,
0.5LSB, 1.5LSB, 2.5LSB, …, FS – 1.5LSB). The output
code is straight binary with 1LSB = VDD/4096 for the S6
package and 1LSB = VREF/4096 for the TS8 package.
VDD
GND
AIN
CONV
SDO
SCK
1
2
3
6
5
4
LTC2362
220pF
51Ω
2.2μF
236012 F14
Figure 14. RC Input Filter
INPUT VOLTAGE (V)
0
1LSB
UNIPOLAR
OUTPUT
CODE
111...111
111...110
236012 F15
000...001
000...000
FS – 1LSB
Figure 15. Transfer Characteristics
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