参数资料
| 型号： | AD2S90AP |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC R/D CONV 12BIT 20-PLCC |
| 标准包装： | 1 |
| 类型： | R/D 转换器 |
| 输入类型： | 并联 |
| 输出类型： | 数字 |
| 接口： | 串行 |
| 电流 - 电源： | 10mA |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-LCC（J 形引线） |
| 供应商设备封装： | 20-PLCC（9x9） |
| 包装： | 管件 |
AD2S90
REV. D
–5–
For more information on the operation of the converter, see
Circuit Dynamics section.
S2 TO S4
(COS)
0
S3 TO S1
(SIN)
R2 TO R4
(REF)
90
180
270
360
Figure 4. Electrical and Physical Resolver Representation
Connecting The Converter
Refer to Figure 4. Positive power supply VDD = +5 V dc
± 5%
should be connected to Pin 13 & Pin 14 and negative power
supply VSS = –5 V dc ± 5% to Pin 12. Reversal of these power
supplies will destroy the device. S3 (SIN) and S2 (COS)
from the resolver should be connected to the SIN and COS pins
of the converter. S1 (SIN) and S4 (COS) from the resolver
should be connected to the SINLO and COSLO pins of the
converter. The maximum signal level of either the SIN or COS
resolver outputs should be 2 V rms
± 10%. The AD2S90
AGND pin is the point at which all analog signal grounds should
be star connected. The SIN LO and COS LO pins on the
AD2S90 should be connected to AGND. Separate screened
twisted cable pairs are recommended for all analog inputs SIN,
COS, and REF. The screens should terminate at the converter
AGND pin.
North marker width selection is controlled by Pin 15, NMC.
Application of VDD, 0 V, or VSS to NMC will select standard
90
°, 180° and 360° pulsewidths. If unconnected, the NM pulse
defaults to 90
°. For a more detailed description of the output
formats available see the Position Output section.
RESOLVER FORMAT SIGNALS
A resolver is a rotating transformer which has two stator wind-
ings and one rotor winding. The stator windings are displaced
mechanically by 90
° (see Figure 4). The rotor is excited with an
ac reference. The amplitude of subsequent coupling onto the
stator windings is a function of the position of the rotor (shaft)
relative to the stator. The resolver, therefore, produces two
output voltages (S3–S1, S2–S4) modulated by the SINE and
COSINE of shaft angle. Resolver format signals refer to the
signals derived from the output of a resolver. Equation 1 illus-
trates the output form.
S3–S1 = EO SIN
ωt SINθ
S2–S4 = EO SIN
ωt COSθ
(1)
where:
θ = shaft angle
SIN
ωt = rotor excitation frequency
EO = rotor excitation amplitude
Principle of Operation
The AD2S90 operates on a Type 2 tracking closed-loop prin-
ciple. The output continually tracks the position of the resolver
without the need for external convert and wait states. As the
transducer moves through a position equivalent to the least
significant bit weighting, the output is updated by one LSB.
On the AD2S90, CLKOUT updates corresponding to one LSB
increment. If we assume that the current word state of the
up-down counter is
φ, S3–S1 is multiplied by COS φ and S2–S4
is multiplied by SIN
φ to give:
EO SIN ωt SIN θ COSφ
EO SIN
ωt COS θ SINφ
(2)
An error amplifier subtracts these signals giving:
EO SIN
θ (SIN θ COS φ – COS θ SIN φ)
or
EO SIN
ωt SIN (θ – φ)
(3)
where (
θ – φ) = angular error
A phase sensitive detector, integrator and voltage controlled
oscillator (VCO) form a closed loop system which seeks to null
sin (
θ – φ). When this is accomplished the word state of the
up/down counter,
φ, equals within the rated accuracy of the
converter, the resolver shaft angle
θ.
OSCILLATOR
TWISTED PAIR
SCREENED
CABLE
S3
S1
S3
S2
S4
POWER RETURN
RESOLVER
10nF
47 F
10nF
47 F
+5V
–5V
0V (POWER GROUND)
15
16
17
18
14
19
20
1
2
3
AD2S90AP
REF
COS LO
COS
AGND
SIN
SIN LO
DGND
7
6
5
48
13
12
11
10
9
VDD
R2
R1
S4
S2
VDD
VSS
Figure 5. Connecting the AD2S90 to a Resolver
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