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參數(shù)資料
| 型號： | AD2S1205 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 12-Bit R/D Converter with Reference Oscillator |
| 中文描述： | 12位的R / D轉(zhuǎn)換器與參考振蕩器 |
| 文件頁數(shù)： | 16/25頁 |
| 文件大小： | 367K |
| 代理商： | AD2S1205 |
Rev.
PrB_10/06
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
2006 Analog Devices, Inc. All rights reserved.
www.analog.com
INCREMENTAL ENCODER OUTPUTS
The incremental encoder emulation outputs A, B, and NM are
free running and are always valid, providing that valid resolver
format input signals are applied to the converter.
The AD2S1205 emulates a 1024-line encoder. Relating this to
converter resolution means one revolution produces 1,024 A, B
pulses. A leads B for increasing angular rotation (i.e., clockwise
direction). The addition of the DIR output negates the need for
external A and B direction decode logic. The DIR output
indicates the direction of the input rotation and it is high for
increasing angular rotation. DIR can be considered as an
asynchronous output and can make multiple changes in state
between two consecutive LSB update cycles. This occurs when
the direction of rotation of the input changes but the magnitude
of the rotation is less than 1 LSB.
The north marker pulse is generated as the absolute angular
position passes through zero. The north marker pulse width is
set internally for 90° and is defined relative to the A cycle.
Figure 9 details the relationship between A, B, and NM.
0
A
B
NM
Figure 9. A, B, and NM Timing for Clockwise Rotation
Unlike incremental encoders, the AD2S1205 encoder output is
not subject to error specifications such as cycle error, eccentric-
ity, pulse and state width errors, count density, and phase . The
maximum speed rating,
n
, of an encoder is calculated from its
maximum switching frequency,
f
MAX
, and its pulses per revo-
lution (
PPR
).
PPR
f
n
MAX
×
=
60
The AD2S1205 A, B pulses are initiated from XTALOUT, which
has a frequency of 4.096 MHz. The equivalent encoder
switching frequency is
)
1
4
024
.
096
.
4
/
Pulse
Updates
MHz
MHz
=
=
×
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