*For RH2-RL2: V
OUTL
-
L
45.38k
V
IN
86.63k + R'
*For RH3-RL3: V
OUTL
-
L
45.38k
V
IN
49.92k + R'
*
Note: For RH2, RL2 and RH3, RL3: V
OUT
(single-ended) = 1/2 V
OUTL
-
L
.
OUTPUT PHASING AND OUTPUT SCALE FACTOR
The analog output signals have the following phasing:
Resolver output:
S3—S1 = (RH - RL)A
o
(1 + A(
θ
)) sin
θ
S2—S4 = (RH - RL)A
o
(1 + A(
θ
)) cos
θ
The output amplifiers simultaneously track reference voltage
fluctuations because they are proportional to (RH - RL). The
transformation ratio A
o
is 11.8/26 for 11.8 Vrms
L
-
L
output. The
maximum variation in A
o
from all causes is ± 0.2%.The term A(
θ
)
represents the variation of the amplitude with the digital signal
input angle. A(
θ
), which is called the scale factor variation, is a
3
35
S3
S3
32
S1
S1
DR-11525
36
S2
S2
31
S4
S4
FIGURE 4. DIFFERENTIAL RESOLVER OUTPUT
35 (+SIN)
S3
S3
DR-11525
36 (+COS)
S2
S2
3
GND
FIGURE 5. SINGLE-ENDED RESOLVER OUTPUT
TABLE 2. PIN CONNECTION TABLE
PIN
NAME
13
14
15
16
17
18
19
20
21
22
23
24
Bit 14
PIN
1
2
3
4
5
6
7
8
9
10
11
12
PIN
25
26
27
28
29
30
31
32
33
34
35
36
NAME
Bit 1 (MSB)
Bit 15
Bit 16 (LSB)
LM
LL
LA
S4 (-COS)
S1 (-SIN)
NC
NC
S3 (+SIN)
S2 (+COS)
NAME
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
NC
+15V
GND
-15V
RH2 (6.81V)
RL2 (6.81V)
-R
RL (11.8V)
RL
3 (2V)
RH (11.8V)
RH
3 (2V)
Notes:
1. -R (Pin 7) can be used for test purposes to detect whether a reference signal
is present. See block diagram.
2. Functions LL, LA, and LM may be left unconnected when not used.
4. RH and RL (pins 10, 8) 26 V reference with differential outputs on pins 35, 36,
32, 31.
5. RH2 and RL2 (pins 5, 6) 26 V reference with single-ended output on pins 35,
36.
6. RH3 and RL3 (pins 11, 9) 4.4 V reference with single-ended outputs on pins
35, 36.
FIGURE 3. REFERENCE LEVEL ADJUSTMENT
49.92k
49.92k
36.71k
36.71k
13.37k
13.37k
REFERENCE
INPUTS
V (RH-RL)
V (RH2-RL2)
V (RH3-RL3)
8.703k
45.38k
VOUT L-L
+
_
R
′
R
′
=
=
smooth function of (
θ
) without discontinuities and is less than
±0.05% for all values of (
θ
). The total maximum variation in
A
o
[1 + A(
θ
)] is therefore ± 0.25%.
Because the amplitude factor (RH - RL)A
o
(1 + A(
θ
)) varies simul-
taneously on all output lines, it will not be a source of error when
the DR-11525 is to drive a ratiometric system such as a synchro
or resolver. However, if the outputs are used independently, as in
x-y plotters, the amplitude variations must be taken into account.