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參數資料
| 型號： | LTC1410I |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 12-Bit, 1.25Msps Sampling A/D Converter with Shutdown |
| 中文描述： | 12位2.5MSPS采樣A / D轉換器，帶有關斷 |
| 文件頁數： | 10/16頁 |
| 文件大?。?/td> | 148K |
| 代理商： | LTC1410I |
10
LTC 1410
APPLICATIO
S I
FOR
ATIO
U
capacitors at the end of conversion. During conversion
the analog inputs draw only a small leakage current. If the
source impedance of the driving circuit is low then the
LTC1410 inputs can be driven directly. As source imped-
ance increases so will acquisition time (see Figure 6). For
minimum acquisition time with high source impedance,
a buffer amplifier should be used. The only requirement
is that the amplifier driving the analog input(s) must
settle after the small current spike before the next conver-
sion starts (settling time must be 100ns for full through-
put rate).
W
U
U
SOURCE RESISTANCE (
)
10
A
μ
s
1
1410 F06
0.1
0.01
100
1k
10k
100k
10
Figure 6. Acquisition Time vs Source Resistance
Choosing an input amplifier is easy if a few requirements
are taken into consideration. First, choose an amplifier
that has a low output impedance (<100
) at the closed-
loop bandwidth frequency. For example, if an amplifier is
used in a gain of +1 and has a closed-loop bandwidth of
50MHz, then the output impedance at 50MHz must be
less than 100
. The second requirement is that the
closed-loop bandwidth must be greater than 20MHz to
ensure adequate small-signal settling for full throughput
rate. If slower op amps are used, more settling time can
be provided by increasing the time between conversions.
Suitable devices capable of driving the ADC’s inputs
include the LT
1360, LT1220, LT1223, LT1224 and
LT1227 op amps.
The noise and the distortion of the input amplifier must
also be considered since they will add to the LTC1410
noise and distortion. The small-signal bandwidth of the
sample-and-hold circuit is 20MHz. Any noise that is 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 usually sufficient. For example, Figure 7 shows a
1000pF capacitor from +A
IN
to ground and a 100
source
resistor will limit the input bandwidth to 1.6MHz. Simple
RC filters work well for AC applications, but they will limit
the transient response. For full speed operation, amplifiers
with fast settling and low noise should be chosen.
1
2
3
4
5
0.1
μ
F
10
μ
F
100
ANALOG
INPUT
1000pF
1410 F07
+A
IN
–A
IN
V
REF
REFCOMP
AGND
LTC1410
Figure 7. RC Input Filter
Internal Reference
The LTC1410 has an on-chip, temperature compensated,
curvature corrected, bandgap reference which is factory
trimmed to 2.500V. It is connected internally to a reference
amplifier and is available at V
REF
(Pin 3). See Figure 8a. A
2k resistor is in series with the output so that it can be
1
2
3
+A
IN
–A
IN
LTC1410
4.06V
0.1
μ
F
10
μ
F
R2
40k
R1
2k
ANALOG
INPUT
2.500V
1410 F08a
REFCOMP
AGND
V
REF
4
5
R3
64k
+
–
BANDGAP
REFERENCE
Figure 8a. LTC1410 Reference Circuit
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