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參數(shù)資料
| 型號： | SDC-19204-302 |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 位置變換器 |
| 英文描述： | SYNCHRO OR RESOLVER TO DIGITAL CONVERTER, DIP40 |
| 封裝： | 1.140 X 2.020 INCH, 0.230 INCH HEIGHT, TDIP-40 |
| 文件頁數(shù)： | 16/16頁 |
| 文件大?。?/td> | 124K |
| 代理商： | SDC-19204-302 |
9
Notes:
(1) tw = 100 ns min (pulse width)
1 - data held in latch,
th = 50 ns min (hold time)
0 - latch is transparent,
thui = 0 ns min (hold time inhibit)
tsu = 0 ns min (setup time)
(3) (LA) INH is latch control
tsui = 300 ns min (setup inhibit)
for CT latch:
(2) When S is low:
1 - latch is transparent,
(LM) EM is latch control for MSB byte,
0 - data held in latch.
(LL) EL is latch control for LSB byte,
ANALOG OUTPUTS
The analog outputs are AC error (e) and velocity (VEL). If the
analog outputs are not required, ground -15 V (pin 36).
AC ERROR (e, PIN 39)
AC Error Out (e) is used in CT mode. The AC error is propor-
tional to the difference between the resolver input angle
θ and
the digital input angle
φ, (θ φ), with a scaling of:
50 mVrms/LSB (10-bit mode)
25 mVrms/LSB (12-bit mode)
12.5 mVrms/LSB (14-bit mode)
6.3 mVrms/LSB (16-bit mode)
The error is positive if it is in phase with the reference and neg-
ative if it is out of phase with the reference. The e output can
swing ±10 V peak min with respect to ground when the voltage
level of the ±15 V power supplies are 15 V. The output level range
changes proportionally with the power supply level.
VELOCITY (VEL, PIN 38)
The velocity output (VEL, pin 38) is a DC voltage proportional to
angular velocity d
θ/dt. The velocity is the input to the voltage-
controlled oscillator (VCO), as shown in FIGURE 1. Its linearity
and accuracy is dependent solely on the linearity and accuracy
of the VCO. The maximum VEL output can swing ±10 V min with
respect to ground when the voltage level of the ±15 V power sup-
plies are 15 V. The output level range changes proportionally with
the power supply level. The analog output VEL characteristics
are listed in TABLE 5. The VEL output has DC tachometer qual-
ity specs such that it can be used as the velocity feedback in
servo applications.
VELOCITY PROGRAMMING (VEL PROG, PIN 37)
The velocity output scale factor can be increased by connecting
an external resistor (R) from VEL PROG (pin 37) to ground. By
scaling up the output, the noise and offset will increase propor-
tionally. The value of R can be determined by the following for-
mula:
R = 10
B/A
1 - B/A
Where:
R = external resistor in k Ohms
A = specified voltage scaling (RPS/VOLT)
B = desired voltage scaling (RPS/VOLT)
To determine A, refer to TABLE 6, Voltage Scaling.
VEL PROG
37
SDC-19204/6
R
;;
;
;;
tw
tsu
tw
th
tsu
tsui
thui
(LA) INH
S = 0
DATA IN
(LM) EM
(LL) EL
FIGURE 13. CT MODE TIMING - TWO-BYTE
TRANSFER, DOUBLE BUFFERED
TABLE 5. VELOCITY OUTPUT CHARACTERISTICS
PARAMETER
UNIT
SDC-19204/6
TYP
MAX
RPS/V
%
PPM/°C
%
% output
mV
V/°C
k Ohms
V
10
100
1
15
25
-
±13
15
200
2
40
50
3
±10 min
Polarity
Voltage scaling
Scale Factor
Scale Factor TC
Reversal Error
Linearity
Zero Offset
Zero Offset TC
Load
Output Voltage
(positive for increasing angle)
See Voltage Scaling TABLE 6.
TABLE 6. VELOCITY OUTPUT VOLTAGE SCALING (RPS/VOLT)
BW
10 BIT
12 BIT
14 BIT
16 BIT
HIGH
16
4
1
0.25
LOW
4
1
0.25
0.062
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