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參數(shù)資料
| 型號： | LTC1405I |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 9-Bit Bus-Interface D-Type Latches With 3-State Outputs 24-PDIP 0 to 70 |
| 中文描述： | 12位，5Msps，采樣ADC |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 218K |
| 代理商： | LTC1405I |
8
LTC 1405
An external reference or a DAC can be used to drive V
REF
over a 0V to 5V range (Figures 3a and 3b). The input
impedance of the V
REF
pin is 2k
, so a buffer may be
required for high accuracy. Driving V
REF
with a DAC is
useful in applications where the peak input signal ampli-
tude may vary. The input span of the ADC can then be
adjusted to match the peak input signal, maximizing the
signal-to-noise ratio.
Both the V
CM
and V
REF
pins must be bypassed with
capacitors to ground. For best performance, 1
μ
F or larger
ceramic capacitors are recommended. For the case of
external circuitry driving V
REF
, a smaller capacitor can be
used at V
REF
so the input range can be changed quickly. In
this case, a 0.05
μ
F or larger ceramic capacitor is accept-
able.
The V
CM
pin is a low output impedance 2.5V reference that
can be used by external circuitry. For single 5V supply
applications it is convenient to connect A
IN–
directly to the
V
CM
pin.
Driving the Analog Inputs
The differential inputs of the LTC1405 are easy to drive.
The inputs may be driven differentially or single-ended
(i. e., the A
IN–
input is held at a fixed value). The A
IN–
and
A
IN+
inputs are simultaneously sampled and any common
mode signal is reduced by the high common mode rejec-
tion of the sample-and-hold circuit. Any common mode
input value is acceptable as long as the input pins stay
between V
DD
and V
SS
. During conversion the analog
inputs are high impedance. At the end of conversion the
inputs draw a small current spike while charging the
sample-and-hold.
For superior dynamic performance in dual supply mode,
the LTC1405 should be operated with the analog inputs
centered at ground, and in single supply mode the inputs
should be centered at 2.5V. If required, the analog inputs
can be driven differentially via a transformer. Refer to
Table 2 for a summary of the analog input and reference
configurations and their relative advantages.
V
CM
SENSE
V
REF
1405 F02
–
+
R1
10k
LOGIC
2.5V
REFERENCE
2.048V
1
μ
F
1
μ
F
2k
TO
ADC
R2
10k
APPLICATIO S U
U
W
U
V
OUT
V
IN
LT1019A-2.5
5V
1405 F03a
1
μ
F
1
μ
F
V
REF
SENSE
5V
V
CM
LTC1405
1405 F03b
1
μ
F
1
μ
F
V
REF
LTC1405
SENSE
V
CM
2.048V
–
+
5k
5k
LTC1450
Figure 2. Reference Circuit
Figure 3a. Using the LT1019-2.5 As an
External Reference; Input Range =
±
1.25V
Figure 3b. Driving V
REF
with a DAC
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