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參數(shù)資料
| 型號： | SD-14597F3-582K |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 位置變換器 |
| 英文描述： | SYNCHRO OR RESOLVER TO DIGITAL CONVERTER, CDFP36 |
| 封裝： | CERAMIC, FP-36 |
| 文件頁數(shù)： | 14/14頁 |
| 文件大?。?/td> | 416K |
| 代理商： | SD-14597F3-582K |
INTERFACING - DYNAMIC PERFORMANCE
A Type II servo loop (KV =
∞) and very high acceleration con-
stants give the SD-14595/96/97 superior dynamic performance.
If the power supply voltage is not the +5 V DC nominal value, the
specified input rates will increase or decrease in proportion to
the fractional change in voltage.
TRANSFER FUNCTIONS
The dynamic performance of the converter can be determined
from its transfer function block diagram (FIGURE 15) and open
and closed loop Bode plots (FIGURES 16 and 17). Values for the
transfer function block can be obtained from TABLE 6.
9
ERROR PROCESSOR
INPUT
θ
Open Loop Transfer function = Output
WHERE:
2
A = A A
1
2
VELOCITY
OUT
DIGITAL
POSITION
OUT
(
φ)
VCO
CT
S
A
+ 1
1
B
S
+ 1
10B
H = 1
2
S
A
+ 1
B
2
S
+ 1
10B
+
-
e
A
2
S
-12
db/oct
4
BA
(BW)
2A
-6 db/oct
10B
ω (rad/sec)
2A
2 2 A
ω (rad/sec)
CLOSED LOOP BW (Hz) =
2 A
π
FIGURE 17. CLOSED LOOP BODE PLOT
FIGURE 16. OPEN LOOP BODE PLOT
FIGURE 15. TRANSFER FUNCTION BLOCK DIAGRAM
RESPONSE PARAMETERS
As long as the converter maximum tracking rate is not exceed-
ed, there will be no velocity lag in the converter output although
momentary acceleration errors remain. If a step input occurs, as
when the power is initially applied, the response will be critically
damped. FIGURE 18 shows the response to a step input. After
initial slewing at the maximum tracking rate of the converter,
there is one overshoot (which is inherent in a Type II servo). The
overshoot settling to a final value is a function of the small signal
settling time.
FASTER SETTLING TIME USING “BIT” TO REDUCE
RESOLUTION
Since the SD-14595 has higher precision in the 16-bit mode and
faster settling in the 14-bit mode, the BIT output can be used to
program the SD-14595 for lower resolution, allowing the con-
verter to settle faster for step inputs. High precision, faster set-
tling can therefore be obtained simultaneously and automatical-
ly in one unit.
CONNECTING THE SD-14595/96/97 TO A P.C. BOARD
The SD-14595/96/97 can be attached to a printed circuit board
using hand solder or wave soldering techniques. Limit exposure to
300°C (572°F) max, for 10 seconds maximum.
Since the SD-14595/96/97 converters contain a CMOS
device, standard CMOS handling procedures should be fol-
lowed.
TABLE 6. DYNAMIC CHARACTERISTICS
60 Hz UNIT
400 Hz UNIT
16-BIT
PARAMETER
UNIT
14-BIT
Input Freq.
Tracking Rate
Bandwidth, cl
Ka
A1
A2
A
B
acc-1 LSB lag
Settling Time
180° degree Step
1.4° degree Step
Hertz
rps
Hertz
1/sec
/sec
ms
47-1k
1.5
40
7,680
0.1
40k
88
14.2
169
450
100
360-1k
10
320
192,000
1.2
160,000
440
100
4220
100
10
16-BIT
47-1k
0.5
20
1920
0.045
40k
44
14.2
11
2000
250
OVERSHOOT
SMALL SIGNAL
SETTLING TIME
MAX SLOPE EQUALS
TRACKING RATE
(SLEW RATE)
θ2
θ1
SETTLING TIME
FIGURE 18. RESPONSE TO STEP INPUT
360-1k
2.5
110
48,000
0.3
160,00
0
220
100
264
400
30
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