參數(shù)資料
型號(hào)： EVAL-AD7262EDZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 14/33頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL CONTROL AD7262
標(biāo)準(zhǔn)包裝： 1
ADC 的數(shù)量： 2
位數(shù)： 12
采樣率（每秒）： 1M
數(shù)據(jù)接口： 串行
輸入范圍： 5 Vpp
在以下條件下的電源（標(biāo)準(zhǔn)）： 120mW @ 1MSPS
工作溫度： -40°C ~ 105°C
已用 IC / 零件： AD7262
已供物品： 板，CD
AD7262
Rev. 0 | Page 20 of 32
Comparator Application Details
The comparators on the AD7262/AD7262-5 have been
designed with no internal hysteresis, allowing users the
flexibility to add external hysteretic if required for systems
operating in noisy environments. If the comparators on the
AD7262/AD7262-5 are used with external hysteresis, some
external resistors and capacitors are required, as shown in
Figure 28. The value of RF and RS, the external resistors, can be
determined using the following equation, depending on the
amount of hysteresis required in the application:
CC
x
F
S
HYS
V
C
R
V
_
×
+
=
where Cx_CxVCC = CA_CBVCC or CC_CDVCC.
The amount of hysteresis chosen must be sufficient to eliminate
the effects of analog noise at the comparator inputs, which may
affect the stability of the comparator outputs. The level of
hysteresis required in any system depends on the noise in the
system; thus, the values of RF and RS need to be carefully selected
to eliminate any noise effects. To increase the level of hysteresis in
the system, increase the value of RSor RF. For example, RF = 10 MΩ,
RS = 1 kΩ give 330 μV of hysteresis with a Cx_CxVCC of 3.3 V; if
hysteresis is increased to 1 mV, RS = 3.1 kΩ. In certain applications,
a load capacitor (100 pF) may be required on the comparator
outputs to suppress high frequency transient glitches.
RS
RF
Cx–
Cx+
RS
SENSOR
COUTx
0
76
06
-0
28
Figure 28. Recommended Comparator Connection Diagram
APPLICATION DETAILS
The AD7262/AD7262-5 have been specifically designed to meet
the requirements of any motor control shaft position feedback
loop. The devices can interface directly to multiple sensor types,
including optical encoders, magneto resistive sensors, and Hall
effect sensors. Flexible analog inputs that incorporate program-
mable gain ensure that identical board design can be used for a
variety of sensors, which results in reduced design cycles and costs.
The two simultaneous sampling ADCs are used to sample the
sine and cosine outputs from the sensor. No external buffering
is required between the sensor/transducer and the analog inputs
of the AD7262/AD7262-5. The on-chip comparators can be
used to monitor the pole sensors, which can be Hall effect sensors
or the inner tracks from an optical encoder.
Figure 29 shows how the AD7262/AD7262-5 can be used in a
typical application. An optical encoder is shown in Figure 29,
but other sensor types could as easily be used. Figure 29 indicates
a typical application configuration only, and there are several
other configurations that render equally effective results.
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