Datasheet

REV. B
–5–
AD2S99
AD2S99/AD2S90 TYPICAL CONFIGURATION
Figure 3 shows a typical circuit configuration for the AD2S99
Oscillator and the AD2S90 Resolver-to-Digital Converter. The
maximum level of the SIN and COS input signals to the
AD2S90 should be 2 V rms ±10%. All the analog ground sig-
nals should be star connected to the AD2S90 AGND pin. If
shielded twisted pair cables are used for the resolver signals, the
shields should also be terminated at the AD2S90 AGND pin.
The SYNREF output of the AD2S99 should be connected to
the REF input pin of the AD2S90 via a 0.1 µF capacitor with a
100 kΩ resistor to GND. This is to block out any dc offset in
the SYNREF signal. For more detailed information please refer
to the AD2S90 data sheet.
NC = NO CONNECT
NC
SIN
NC
DGND
COS
EXC
EXC
NC
AGND
NC
1931220
4
5
8
6
7
12 1391110
18
17
14
16
15
TOP VIEW
(Not to Scale)
AD2S99
SEL1
V
SS
SEL2
V
SS
NC
SYNREF
NC
LOS
V
DD
19
3
1
2
20
4
5
8
6
7
12
13
9
11
10
18 17 1416 15
4.7µF
4.7µF
0.1µF
0.1µF
COS
SINREF
S2
S4
S3
S1
R4
R2
RESOLVER
REF
COS
AGND
SIN
SIN LO
V
DD
V
SS
DGND
AD2S90
TOP VIEW
(Not to Scale)
0.1µF
100kΩ
V
DD
V
SS
V
DD
0.1µF
50kΩ
4.7µF
0.1µF
4.7µF
V
SS
SEL2 = GND
SEL1 = V
SS
F
OUT
= 5kHz
COS LO
S4
S3
S1
S2
V
DD
POWER
RETURN
FBIAS
V
DD
Figure 3. AD2S99 and AD2S90 Example Configuration