參數(shù)資料
型號(hào)： AD2S1210CSTZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 13/36頁(yè)
文件大?。?/td> 0K
描述： IC CONV R/D VAR RES OSC 48-LQFP
標(biāo)準(zhǔn)包裝： 1
類型： R/D 轉(zhuǎn)換器
分辨率（位）： 10，12，14，16 b
數(shù)據(jù)接口： 串行，并聯(lián)
電壓電源： 模擬和數(shù)字
電源電壓： 4.75 V ~ 5.25 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 48-LQFP
供應(yīng)商設(shè)備封裝： 48-LQFP（7x7）
包裝： 托盤
配用： EVAL-AD2S1210EDZ-ND - BOARD EVAL AD2S1210
AD2S1210
Rev. A | Page 20 of 36
CONFIGURATION OF AD2S1210
MODES OF OPERATION
The AD2S1210 has two modes of operation: configuration mode
and normal mode. The configuration mode is used to program
the registers that set the excitation frequency, the resolution,
and the fault detection thresholds of the AD2S1210. Configuration
mode is also used to read back the information in the fault register.
The data in the position and velocity registers can also be read
back while in configuration mode. The AD2S1210 can be operated
entirely in configuration mode or, when the initial configuration is
completed, the part can be taken out of configuration mode and
operated in normal mode. When operating in normal mode, the
data outputs can provide angular position or angular velocity
data. The A0 and A1 inputs are used to determine whether the
AD2S1210 is in configuration mode and to determine whether
the position or velocity data is supplied to the output pins, see
Setting the Excitation Frequency
The excitation frequency of the AD2S1210 is set by writing a
frequency control word to the excitation frequency register,
Address 0x91 (see the Register Map section).
(
)
15
2
CLKIN
f
FCW
Frequency
Excitation
×
=
where FCW is the frequency control word and fCLKIN is the clock
frequency of the AD2S1210.
The specified range of the excitation frequency is from 2 kHz to
20 kHz and can be set in increments of 250 Hz. To achieve the
angular accuracy specifications in Table 1, the excitation frequency
should be selected as outlined in Table 7.
Table 7. Recommended Excitation Frequency vs. Resolution
(fCLKIN = 8.192 MHz)
Resolution
Typical
Bandwidth
Min Excitation
Frequency
Max Excitation
Frequency
10 Bits
4100 Hz
10 kHz
20 kHz
12 Bits
1700 Hz
6 kHz
20 kHz
14 Bits
900 Hz
3 kHz
12 kHz
16 Bits
250 Hz
2 kHz
10 kHz
Note that the recommended frequency range for each resolution
and bandwidth, as outlined in Table 7, are defined for a clock
frequency of 8.192 MHz. The recommended excitation frequency
range scales with the clock frequency of the AD2S1210. The
default excitation frequency of the AD2S1210 is 10 kHz when
operated with a clock frequency of 8.192 MHz.
A0, A1 Inputs
The AD2S1210 allows the user to read the angular position or
the angular velocity data directly from the parallel outputs or
through the serial interface. The required information can be
selected using the A0 and A1 inputs. These inputs should also
be used to put the part into configuration mode. The data from
the fault register and the remaining on-chip registers can be
accessed in configuration mode.
Table 8. Configuration Mode Settings
A0
A1
Result
0
Normal mode—position output
0
1
Normal mode—velocity output
1
0
Reserved
1
Configuration mode
RES0, RES1 Inputs
In normal mode, the resolution of the digital output is selected
using the RES0 and RES1 input pins. In configuration mode,
the resolution is selected by setting the RES0 and RES1 bits in
the control register. When switching between normal mode and
configuration mode, it is the responsibility of the user to ensure
that the resolution set in the control register matches the resolution
set by the RES0 and RES1 input pins. Failure to do so may result
in incorrect data on the outputs, caused by the differences
between the resolution settings.
Table 9. Resolution Settings
RES0
RES1
Resolution
(Bits)
Position LSB
(Arc min)
Velocity LSB
0
10
21.1
4.88
0
1
12
5.3
0.488
1
0
14
1.3
0.06
1
16
0.3
0.004
1 CLKIN = 8.192 MHz. The velocity LSB size and maximum tracking rate scale
linearly with the CLKIN frequency.
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