AD2S99 Analog Devices, AD2S99 Datasheet - Page 5

• Manufacturer Part Number: AD2S99
• Description: Programmable Oscillator
• Manufacturer: Analog Devices

REV. B
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
REF
R4
R2
S2
RESOLVER
COS
S4
SIN
S1
S3
Figure 3. AD2S99 and AD2S90 Example Configuration
SEL2 = GND
SEL1 = V
F
OUT
= 5kHz
SS
NC = NO CONNECT
DGND
–5–
COS
SIN
NC
NC
S4
S3
S1
S2
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 F capacitor with a
100 k 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.
4
5
6
7
8
POWER
RETURN
0.1µF
19
20
1
2
3
V
3
9
DD
(Not to Scale)
REF
COS LO
COS
AGND
SIN
SIN LO
10
18 17
AD2S99
TOP VIEW
4
2
11
5
1
50k
(Not to Scale)
16 15
20
12 13
AD2S90
TOP VIEW
6
100k
19
7
0.1µF
DGND
V
14
V
V
DD
8
18
17
16
15
14
DD
SS
EXC
EXC
AGND
NC
NC
13
12
11
10
9
0.1µF
4.7µF
V
DD
0.1µF
0.1µF
4.7µF
V
SS
4.7µF
4.7µF
V
V
AD2S99
DD
SS