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參數(shù)資料
| 型號： | LTC1287CIN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 3V Single Chip 12-Bit Data Acquisition System |
| 中文描述： | 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大小： | 324K |
| 代理商： | LTC1287CIN |
LTC1287
9
U
S
A
O
PPLICATI
U
U
such as obtained from a voltage regulator (e.g., LT1117).
For high frequency bypassing a 0.1
μ
F ceramic disk placed
in parallel with the 22
μ
F is recommended. Again the leads
should be kept to a minimum. Using a battery to power the
LTC1287 will help reduce the amount of bypass capacitance
required on the V
CC
pin. A battery placed close to the
device will only require 10
μ
F to adequately bypass the
supply pin. Figure 4 shows the effect of poor V
CC
bypassing.
Figure 5 shows the settling of a LT1117 low dropout
regulator with a 22
μ
F bypass capacitor. The noise and
ripple is kept around 0.5mV. Figure 6 shows the response
of a lithium battery with a 10
μ
F bypass capacitor. The
noise and ripple is kept below 0.5mV.
Analog Inputs
Because of the capacitive redistribution A/D conversion
techniques used, the analog inputs of the LTC1287 have
Figure 5. LT1117 Regulator with 22
μ
F Bypassing on V
CC
CS
5V/DIV
V
CC
0.5mV/DIV
HORIZONTAL: 20
μ
s/DIV
Figure 6. Lithium Battery with 10
μ
F Bypassing on V
CC
CS
5V/DIV
V
CC
0.5mV/DIV
HORIZONTAL: 20
μ
s/DIV
capacitive switching input current spikes. These current
spikes settle quickly and do not cause a problem. If large
source resistances are used or if slow settling op amps
drive the inputs, take care to insure the transients caused
by the current spikes settle completely before the
conversion begins.
Source Resistance
The analog inputs of the LTC1287 look like a 100pF
capacitor (C
IN
) in series with a 1.5k resistor (R
ON
). This
value for R
ON
is for V
CC
= 2.7V. With larger supply voltages
R
ON
will be reduced. For example, with V
CC
= 2.7V and V
–
= –2.7V, R
ON
becomes 500
. C
IN
gets switched between
(+) and (–) inputs once during each conversion cycle.
Large external source resistors and capacitances will slow
the settling of the inputs. It is important that the overall RC
time constant is short enough to allow the analog inputs
to settle completely within the allowed time.
Figure 7. Analog Input Equivalent Circuit
HORIZONTAL: 10
μ
s/DIV
Figure 4. Poor V
CC
Bypassing. Noise and
Ripple Can Cause A/D Errors
CS
↑
R
ON
= 1.5k
t
+
1/2 CLK
C
=
100pF
LTC1287
“+”
INPUT
R
SOURCE
+
V
IN
+
C1
“–”
INPUT
R
SOURCE
–
V
IN
–
C2
LTC1287 F07
V
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