AD2S99 View Datasheet(PDF) - Analog Devices

Part Name

Description

MFG CO.

AD2S99

Programmable Oscillator

Analog Devices 

AD2S99/AD2S93 TYPICAL CONFIGURATION

Figure 5 shows a typical circuit configuration for the AD2S99

Oscillator and the AD2S93 LVDT-to-Digital Converter. The

maximum level of the A and B transducer input signals to the

AD2S93 should be 1 V rms ± 20%. All the analog ground sig-

nals should be star connected to the AD2S93 AGND pin. If

shielded twisted pair cables are used for the LVDT signals, the

AD2S99

shields should also be terminated at the AD2S93 AGND pin.

The SYNREF output of the AD2S99 cannot be used as the

REF input signal for the AD2S93. The zero crossing reference

for the AD2S93 should be taken from the primary winding of

the LVDT through a phase lead or lag network. The phase com-

pensation network ensures that the REF input is phase coherent

with the A and B input signals to the AD2S93.

SEL2 = GND

SEL1 = VSS

FOUT = 5kHz

VDD

VSS

0.1µF

4.7µF

NC = NO CONNECT

NC 4

SIN

5

DGND

6

COS 7

NC 8

3 2 1 20 19

AD2S99

TOP VIEW

(Not to Scale)

18 EXC

EXC

17

16 AGND

15 NC

14 NC

9 10 11 12 13

50kΩ

0.1µF

LOS

VDD

4.7µF

B

PRI

SEC

A

LVDT

C1

R2 C2

C4

R6 C3

R5

PHASE

COMP

25 24 23 22 21 20 19

R7

26 NC

27 B

28 A

1 AGND

2 DIFF

3 GAIN

4 LOS

AD2S93

TOP VIEW

(Not to Scale)

18

DMODOUT

VDD 17

VSS 16

DGND 15

0.1µF

0.1µF

DIR 14

NULL 13

OVR 12

VDD

4.7µF

4.7µF

VSS

5 6 7 8 9 10 11

NC = NO CONNECT

Figure 5. AD2S99 and AD2S93 Example Configuration

REV. B

–7–

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