VCA8500_0803 Datasheet, PDF(32/40 Page) Texas Instruments – 8-Channel, Ultralow-Power, Variable Gain Amplifier with Low-Noise Pre-Amp

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VCA8500_0803 Datasheet, PDF (32/40 Pages) Texas Instruments – 8-Channel, Ultralow-Power, Variable Gain Amplifier with Low-Noise Pre-Amp

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VCA8500

SBOS390A â JANUARY 2008 â REVISED MARCH 2008

www.ti.com

+5V

C16

1mF

IN8

C25

0.1mF

C15

1mF

IN7

C24

0.1mF

+3.3V

C14

1mF

IN6

0.1mF

C13

1mF

IN5

C22

0.1mF

C23

0.1mF

+3.3V

CW0

CW1

CW2

CW3

CW4

DIN

CLK

DOUT

RST

0.1mF

CW5

CW6

CW7

CW8

CW9

CW0

CW1

CW2

CW3

CW4

D_IN

CLK

D_OUT

RST

59 DVDD

60 CW5

CW6

CW7

CW8

CW9

Flag

PAD

C10

0.1mF

1mF

IN1

C17

C10

2.2mF 0.1mF

1mF

IN2

C11

1mF

IN3

C12

1mF

IN4

VCA8500

OUT_QFN_RGC-64

C19

0.1mF

C20

0.1mF

C21

0.1mF

VCONTROL

100W

+5V

0.01mF

C36

2.2mF

C14

0.1mF

C35

0.1mF

C34

0.1mF

C33

0.1mF

C32

0.1mF

C31

0.1mF

+3.3V

OUT8

OUT7

OUT6

OUT5

OUT1

OUT2 22

OUT2 21

OUT3

OUT4

+3.3V C6

0.1mF

C30

2.2mF

C29

0.1mF

C28

0.1mF

C27

2.2mF

C26

0.1mF

R17

OUT8P

R16

C44

OUT8N

R15

OUT7P

R14

C43

OUT7N

R13

OUT6P

R12

C42

OUT6N

R11

OUT5P

R10

C41

OUT5N

OUT1P

C37

OUT1N

OUT2P

C38

OUT2N

OUT3P

C39

OUT3N

OUT4P

C40

OUT4N

(1) VCONTROL: Values for R1 and C4 should be selected for a desired time constant.

(2) Optional components: Values for R2 to R17 and C37 to C44 should be selected based on the analog-to-digital converter selected.

(3) The +3.3V supply connections for DVDD and AVDD1 should be joined to a low-noise +3.3V system supply. Consider filtering any supply

noise with an LC filter.

Figure 70. Typical Connection Diagram

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