LTC2366 Linear Technology, LTC2366 Datasheet - Page 19

• Manufacturer Part Number: LTC2366
• Description: (LTC2365 / LTC2366) 12-Bit Serial Sampling ADCs
• Manufacturer: Linear Technology

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APPLICATIONS INFORMATION
LTC1566-1: Low Noise 2.3MHz Continuous Time Low-
Pass Filter.
LT1630: Dual 30MHz Rail-to-Rail Voltage Feedback Ampli-
fi er. 2.7V to ±15V supplies. Very high A
and 520ns settling to 0.5LSB for a 4V swing. THD and noise
are –93dB to 40kHz and below 1LSB to 320kHz (A
2V
applications (to 1/3 Nyquist) where rail-to-rail performance
is desired. Quad version is available as LT1631.
LT1632: Dual 45MHz Rail-to-Rail Voltage Feedback Ampli-
fi er. 2.7V to ±15V supplies. Very high A
and 400ns settling to 0.5LSB for a 4V swing. It is suitable
for applications with a single 5V supply. THD and noise
are –93dB to 40kHz and below 1LSB to 800kHz (A
2V
applications where rail-to-rail performance is desired.
Quad version is available as LT1633.
LT1813: Dual 100MHz 750V/μs 3mA Voltage Feedback
Amplifi er. 5V to ±5V supplies. Distortion is –86dB to
100kHz and –77dB to 1MHz with ±5V supplies (2V
into 500). Excellent part for fast AC applications with ±5V
supplies.
LT1801: 180MHz GBWP , –75dBc at 500kHz, 2mA/Ampli-
fi er, 8.5nV/√Hz.
LT1806/LT1807: 325MHz GBWP , –80dBc Distortion at
5MHz, Unity-Gain Stable, R-R In and Out, 10mA/Ampli-
fi er, 3.5nV/√Hz.
LT1810: 180MHz GBWP , –90dBc Distortion at 5MHz,
Unity-Gain Stable, R-R In and Out, 15mA/Amplifi er,
16nV/√Hz.
LT1818/LT1819: 400MHz, 2500V/μs, 9mA, Single/Dual
Voltage Mode Operational Amplifi er.
LT6200: 165MHz GBWP , –85dBc Distortion at 1MHz,
Unity-Gain Stable, R-R In and Out, 15mA/Amplifi er,
0.95nV/√Hz.
LT6203: 100MHz GBWP , –80dBc Distortion at 1MHz,
Unity-Gain Stable, R-R In and Out, 3mA/Amplifier,
1.9nV√Hz.
LinearView is a trademark of Linear Technology Corpration
P-P
P-P
into 1k, V
into 1k, V
S
S
= 5V), making the part excellent for AC
= 5V), making the part excellent for AC
VOL
VOL
, 500μV offset
, 1.5mV offset
V
V
= 1,
= 1,
P-P
Input Filtering and Source Impedance
The noise and the distortion of the input amplifi er and other
circuitry must be considered since they will add to the
LTC2365/LTC2366 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 bandwidth. Noisy
input circuitry should be fi ltered prior to the analog inputs
to minimize noise. A simple 1-pole RC fi lter is suffi cient for
many applications. For example, Figure 18 shows a 47pF
capacitor from A
limit the input bandwidth to 47MHz. 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 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 fi 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 fi lter is required.
High external source resistance, combined with the 20pF of
input capacitance, will reduce the rated 50MHz bandwidth
and increase acquisition time beyond 56ns.
IN
51Ω
Figure 18. RC Input Filter
47pF
to ground and a 51Ω source resistor to
10μF
LTC2365/LTC2366
1
2
3
23656 F18
V
GND
A
DD
IN
LTC2366
SD0
SCK
CS
6
5
4
19
23656f