CXA1992AR 查看數據表（PDF） - Sony Semiconductor

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CXA1992AR

RF Signal Processing Servo Amplifier

Sony Semiconductor 

CXA1992AR

Tracking Error Amplifier

R2

R5

260k

13k

TE AMP

C2

12p

R3

26k

NORMAL

R16

96k

R14

13k

R9

TGFL

F 41

VC

17k

VF

R8

17k

GAIN UP

R18

GAIN UP

7.5k

VC

F I-V AMP R1

260k

R4

6.8k

R13

13k

V

TGFL

NORMAL

R12

E 42

C1

12p

96k

VE

VC

VC

VC

E I-V AMP

RE

VC

43

EI

R23 R24

100k 150k

C3

C4

0.01µ 0.01µ

TEO

45

GND

GND

LPFI

46

VIN > VH L

VIN < VH H

VH

BALH

20mV

VC

VIN

BALL

–

+

VL VIN > VL H

–20mV VIN < VL L SENS

R22

1.5k

VC

VIN > VH L SELECTOR

VH VIN < VH H

TGH

400mV

VC

VIN

TGL

300mV

VL

VIN > VL H

VIN < VL L

VC

CCOOMMAANNDD

CCOONNTTRROOLL

SENS1

25

SENS2

26

XRST

23

DATA

22

XLT

21

CLK

20

CPU

The difference between E I-V amplifier output VE and F I-V amplifier output VF is taken and output from TEO.

The tracking error amplifier has built-in balance and gain adjustment circuits to enable software-based

automatic adjustment.

The balance adjustment is performed by varying the combined resistance value of the T-configured feedback

resistance at the E I-V amplifier.

E I-V AMP feedback resistance = R1 + R4 + R1 × R4

RE

F I-V AMP feedback resistance = R2 + R5 + R2 × R5 = 403kΩ

R3

Vary the combined resistance value of the E I-V amplifier's feedback resistance by using the balance

adjustment switches (BAL1 to BAL4).

The gain adjustment is performed by resistance dividing the TE AMP output by the gain adjustment switches

(TOG1 to TOG4).

The balance and gain adjustment switches are controlled with commands.

Set the cut-off frequency of the external LPF between 10Hz to 100Hz.

– 19 –

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