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參數(shù)資料
| 型號(hào)： | EL5185 |
| 廠商： | Intersil Corporation |
| 元件分類： | Codec |
| 英文描述： | Stereo CODEC with line-out (S/W Control) 28-SSOP |
| 中文描述： | 4ns的高速比較器 |
| 文件頁數(shù)： | 9/9頁 |
| 文件大小： | 100K |
| 代理商： | EL5185 |
9
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
where:
V
S
is the analog supply voltage from V
S
+ to V
S
-
I
S
is the analog quiescent supply current per comparator
V
SD
is the digital supply voltage from V
SD
to ground
I
SD
is the digital supply current per comparator
I
SD
strongly depends on the input switching frequency.
Please refer to the performance curve to choose the input
driving frequency. Having obtained the power dissipation,
the maximum junction temperature can be determined as
follows:
where:
T
MAX
is the maximum ambient temperature
θ
JA
is the thermal resistance of the package
Threshold Detector
The inverting input is connected to a reference voltage and
the non-inverting input is connected to the input. As the input
passes the V
REF
threshold, the comparator's output
changes state. The non-inverting and inverting inputs may
be reversed.
Crystal Oscillator
A simple crystal oscillator using one comparator of an
EL5185 is shown below. The resistors R
1
and R
2
set the
bias point at the comparator's non-inverting input. Resistors
R
3
, R
4
, and C
1
set the inverting input node at an appropriate
DC average voltage based on the output. The crystal's path
provides resonant positive feedback and stable oscillation
occurs. Although the EL5185 will give the correct logic
output when an input is outside the common mode range,
additional delays may occur when it is so operated.
Therefore, the DC bias voltages at the inputs are set about
500mV below the center of the common mode range and the
200
resistor attenuates the feedback to the non-inverting
input. The circuit will operate with most AT-cut crystal from
1MHz to 8MHz over a 2V to 7V supply range. The output
duty cycle for this circuit is roughly 50% at 5V V
CC
, but it is
affected by the tolerances of the resistors. The duty cycle
can be adjusted by changing V
CC
value.
T
JMAX
T
MAX
Θ
JA
P
DISS
×
+
=
+
-
V
IN
V
REF
V
OUT
+
-
200
W
V
OUT
R
4
R
3
5V
1MHz to
8MHz
2k
W
C
1
0.01μF
5k
W
1.5k
W
2k
W
R
1
R
2
EL5185
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