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參數(shù)資料
| 型號(hào)： | LTC2356IMSE-12#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | ADC |
| 英文描述： | 1-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁(yè)數(shù)： | 3/16頁(yè) |
| 文件大小： | 266K |
| 代理商： | LTC2356IMSE-12#TR |
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11
LTC2356-12/LTC2356-14
2356f
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 LTC2356-12/LTC2356-14 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 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 AIN+ to ground and
a 51
source resistor to 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 ca-
pacitors and resistors should be used since these compo-
nents 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 resis-
tance, combined with the 13pF of input capacitance, will
reduce the rated 50MHz bandwidth and increase acquisi-
tion time beyond 39ns.
Figure 1. RC Input Filter
inverting input. The
±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 external reference. The
DC common mode level is supplied by the previous stage
that is already bounded by the single supply voltage of the
system. The common mode range of the inputs extend
from ground to the supply voltage VDD. If the difference
between the AIN+ and AIN– inputs exceeds 1.25V, the
output code will stay fixed at zero and all ones and if this
difference goes below –1.25V, the output code will stay
fixed at one and all zeros.
APPLICATIO S I FOR ATIO
WU
U
10
F
VCM
1.5V DC
11
3
AIN
–
LTC2356-12/
LTC2356-14
AIN
+
47pF
2
1
51
GND
VREF
2356 F01
+
AIN
+
C4
10
F
2356 F02
R2
1.6k
C2
1
F
C1
1
F
C1, C2: FILM TYPE
C3: COG TYPE
C4: CERAMIC BYPASS
R1
1.6k
1
2
3
LTC2356-12/
LTC2356-14
AIN
–
VREF
R3
51
C3
56pF
VIN
Figure 2. AC Coupling of AC Signals with 1kHz
Low Cutoff Frequency
INPUT RANGE
The analog inputs of the LTC2356-12/LTC2356-14 may be
driven fully differentially with a single supply. Each input
may swing up to 2.5VP-P individually. When using the
internal reference, the non-inverting input should never be
more than 1.25V more positive or more negative than the
INTERNAL REFERENCE
The LTC2356-12/LTC2356-14 has an on-chip, tempera-
ture compensated, bandgap reference that is factory
trimmed to 2.5V to obtain a bipolar
±1.25V input span. The
reference amplifier output VREF, (Pin 3) must be bypassed
with a capacitor to ground. The reference amplifier is
stable with capacitors of 1
F or greater. For the best noise
performance, a 10
Fceramicora10Ftantaluminparallel
with a 0.1
Fceramicisrecommended.TheVREFpincanbe
overdriven with an external reference as shown in
Figure 3. Overdriving VREF Pin with an External Reference
GND
LTC2356-12/
LTC2356-14
LT1790-3
VREF
10
F
3.5V TO 18V
11
3
3V
2356 F03
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