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參數(shù)資料
| 型號(hào)： | LTC1283 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 3V Single Chip 10-Bit Data Acquisition System(3V，單片，10位數(shù)據(jù)采集系統(tǒng)) |
| 中文描述： | 3V的單芯片10位數(shù)據(jù)采集系統(tǒng)（3V的，單片，10位數(shù)據(jù)采集系統(tǒng)） |
| 文件頁數(shù)： | 21/24頁 |
| 文件大?。?/td> | 380K |
| 代理商： | LTC1283 |
21
LTC1283
U
S
A
O
PPLICATI
U
U
contribute virtually no uncertainty to the output code.
However, for reduced references, the noise may become a
significant fraction of an LSB and cause undesirable jitter in
the output code. For example, with a 1V reference, this same
200
μ
V noise is 0.2LSB peak-to-peak. This will reduce the
range of input voltages over which a stable output code can
be achieved by 0.2LSB. If the reference is further reduced to
200mV, the 200
μ
V noise becomes equal to one LSB and a
stable code may be difficult to achieve. In this case averag-
ing readings may be necessary.
This noise data was taken in a very clean setup. Any setup
induced noise (noise or ripple on V
CC
, V
REF
, V
IN
or V
–
) will
add to the internal noise. The lower the reference voltage to
be used, the more critical it becomes to have a clean, noise-
free setup.
when operating at low values of V
REF
because of the
reduced LSB step size and the resulting higher accuracy
requirement placed on the converter. The following factors
must be considered when operating at low V
REF
values.
1. Conversion speed (ACLK frequency)
2. Offset
3. Noise
Conversion Speed with Reduced V
REF
With reduced reference voltages, the LSB step size is
reduced and the LTC1283 internal comparator overdrive
is reduced. With less overdrive, more time is required to
perform a conversion. Therefore, the maximum ACLK
frequency should be reduced when low values of V
REF
are
used. This is shown in the typical curve of Maximum
Conversion Clock Rate vs Reference Voltage.
Offset with Reduced V
REF
The offset of the LTC1283 has a larger effect on the output
code when the A/D is operated with reduced reference
voltage. The offset (which is typically a fixed voltage)
becomes a larger fraction of an LSB as the size of the LSB
is reduced. The typical curve of Unadjusted Offset Error vs
Reference Voltage shows how offset in LSBs is related to
reference voltage for a typical value of V
OS
. For example,
a V
OS
of 0.5mV which is 0.2LSB with a 2.5V reference
becomes 0.5LSB with a 1V reference and 2.5LSBs with a
0.2V reference. If this offset is unacceptable, it can be
corrected digitally by the receiving system or by offsetting
the “–” input to the LTC1283.
Noise with Reduced V
REF
The total input referred noise of the LTC1283 can be
reduced to approximately 200
μ
V
peak-to-peak using a
ground plane, good bypassing, good layout techniques
and minimizing noise on the reference inputs. This noise
is insignificant with a 2.5V reference but will become a
larger fraction of an LSB as the size of the LSB is reduced.
The typical curve of Noise Error vs Reference Voltage
shows the LSB contribution of this 200
μ
V of noise.
For operation with a 2.5V reference, the 200
μ
V noise is only
0.08LSB peak-to-peak. In this case, the LTC1283 noise will
A “Quick Look” Circuit for the LTC1283
Users can get a quick look at the function and timing of the
LTC1283 by using the following simple circuit. REF
+
and
D
IN
are tied to V
CC
selecting a 3V input span, CH7 as a
single-ended input, unipolar mode, MSB-first format and
16-bit word length. ACLK and SCLK are tied together and
driven by an external clock. CS is driven at 1/64 the clock
rate by the CD4520 and D
OUT
outputs the data. All other
pins are tied to a ground plane. The output data from the
D
OUT
pin can be viewed on an oscilloscope which is set up
to trigger on the falling edge of CS.
Scope Trace of LTC1283 “Quick Look” Circuit
Showing A/D Output of 0101010101 (155
HEX
)
VERTICAL: 1V/DIV, HORIZONTAL: 5
μ
s/DIV
CS
D
OUT
MSB
(B9)
DEGLITCHER
TIME
LSB
(B0)
FILLS
ZEROES
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