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參數(shù)資料
| 型號： | AD2S100 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | AC Vector Processor |
| 中文描述： | SPECIALTY ANALOG CIRCUIT |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 393K |
| 代理商： | AD2S100 |
AD2S100
REV. A
–6–
ANALOG SIGNAL INPUT AND OUTPUT CONNECTIONS
Input Analog Signals
All analog signal inputs to AD2S100 are voltages. There are two
different voltage levels of three-phase (0
°
, 120
°
, 240
°
) signal in-
puts. One is the nominal level, which is
±
2.8 V dc or 2 V rms
and the corresponding input pins are PH/IP1 (Pin 17), PH/IP2
(Pin 15), PH/IP3 (Pin 13) and PH/IP4 (Pin 11).
The high level inputs can accommodate voltages from nominal
up to a maximum of
±
V
DD
/V
SS
. The corresponding input pins
are PH/IPH1 (Pin 16), PH/IPH2 (Pin 14) and PH/IPH3 (Pin
12). The homopolar output can only be used in the three-phase
connection mode.
The converter can accept both two-phase format and three-
phase format input signals. For the two-phase format input, the
two inputs must be orthogonal to each other. For the three-
phase format input, there is the choice of using all three inputs
or using two of the three inputs. In the latter case, the third in-
put signal will be generated internally by using the information
of other two inputs. The high level input mode, however, can
only be selected with three-phase/three-input format. All these
different conversion modes, including nominal/high input level
and two/three-phase input format can be selected using two se-
lect pins (Pin 23, Pin 24). The functions are summarized in
Table I.
Table I. Conversion Mode Selection
CONV1
(Pin 23)
CONV2
(Pin 24)
Mode
Description
MODE1
2-Phase Orthogonal with 2 Inputs
Nominal Input Level
3-Phase (0
°
, 120
°
, 240
°
) with 3 Inputs
Nominal/High Input Level*
3-Phase (0
°
, 120
°
, 240
°
) with 2 Inputs
Nominal Input Level
NC
DGND
MODE2
DGND
V
DD
MODE3
V
DD
V
DD
*The high level input mode can only be selected with MODE2.
MODE1: 2-Phase/2 Inputs with Nominal Input Level
In this mode, PH/IP1 and PH/IP4 are the inputs and the Pins
12 through 16 must be left unconnected.
MODE2: 3-Phase/3 Inputs with Nominal/High Input Level
In this mode, either nominal or high level inputs can be used.
For nominal level input operation, PH/IP1, PH/IP2 and PH/IP3
are the inputs, and there should be no connections to PH/IPH1,
PH/IPH2 and PH/IPH3; similarly, for high level input opera-
tion, the PH/IPH1, PH/IPH2 and PH/IPH3 are the inputs, and
there should be no connections to PH/IP1, PH/IP2 and PH/IP3.
In both cases, the PH/IP4 should be left unconnected. For high
level signal input operation, select MODE2 only.
MODE3: 3-Phase/2 Inputs with Nominal Input Level
In this mode, PH/IP2 and PH/IP3 are the inputs and the third
signal will be generated internally by using the information of
other two inputs. It is recommended that PH/IP1, PH/IPH1,
PH/IPH2, PH/IP4 and PH/IPH3 should be left unconnected.
CONVERTER OPERATION
The architecture of the AD2S100 is illustrated in Figure 3. The
AD2S100 is configured in the forward transformation which ro-
tates the stator coordinates to the rotor reference frame.
Forward Rotation
In this configuration the 3
φ
–2
φ
Clark is bypassed, and inputs are
fed directly into the quadrature (PH/IP4) and direct (PH/ IPI)
inputs to the Park transform, e
i
φ
, where
φ
is defined by the
AD2S100’s digital input. Position data,
φ
, is loaded into the in-
put latch on the positive edge of the strobe pulse. (For detail on
the timing, please refer to the “timing diagram.”) The negative
edge of the strobe signifies that conversion has commenced. A
busy pulse is subsequently produced as data is passed from the
input latches to the Sin and Cos multipliers. During the loading
of the multiplier, the busy pulse remains high to ensure simulta-
neous setting of
φ
in both the Sin and Cos registers.
The negative edge of the busy pulse signifies that the multipliers
are set up and the orthogonal analog inputs are multiplied real
time. The resultant two outputs are accessed via the PH/OPI
(Pin 7) and PH/OP4 (Pin 6), alternatively they can be directly
applied to the output Clark transform. The Clark output is the
vector sum of the analog input vector (Cos
θ
(PH/OPl), Cos (
θ
+
120
°
) (PH/OP2), Cos (
θ
+ 240
°
) (PH/OP3) and the digital in-
put vector
φ
.
For other configurations, please refer to “Forward and Reverse
Transformation.”
CONNECTING THE CONVERTER
Power Supply Connection
The power supply voltages connected to V
DD
and V
SS
pins
should be +5 V dc and –5 V dc and must not be reversed. Pin 4
(V
DD
) and Pin 41 (V
DD
) should both be connected to +5 V;
similarly, Pin 5 (V
SS
) and Pin 19 (V
SS
) should both be con-
nected to –5 V dc.
It is recommended that decoupling capacitors, 100 nF (ceramic)
and 10
μ
F (tantalum) or other high quality capacitors, are con-
nected in parallel between the power line V
DD
, V
SS
and AGND
adjacent to the converter. Separate decoupling capacitors should
be used for each converter. The connections are shown in Fig-
ure 4.
AD2S100
TOP VIEW
1
23
12
34
V
D
V
S
V
S
V
D
AGND
100nF
100nF
10μF
10μF
+
+
+5V
GND
–5V
Figure 4. AD2S100 Power Supply Connection
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