VCA820IDGSRG4 datasheet(5/37 Pages) TI

Part #	VCA820IDGSRG4

Description	Wideband, 40dB Adjust Range, Linear in dB VARIABLE GAIN AMPLIFIER

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10

1

0.1

GainResistor( )

W

10

100

1k

I

=2.6mA

RG MAX

V

(V )=2 ´ R

I

(A )

´

INMAX

PP

G

RG MAX

P

40

35

30

25

20

15

10

5

0

FeedbackResistor( )

W

100

1k

10k

I

=2.6mA

RG

A

(V/V)=2 ´ [R /V (V )]

2

I

(A

´

)

VMAX

F

IN

PP

P

RG

V =1V

O

PP

V =2V

O

PP

V =4V

O

PP

V =3V

O

PP

60

50

40

30

20

10

0

OutputVoltage(V )

PP

0.1

1

10

I

=2.6mA

RG

A

(V/V)=2 ´ [R /V (V )]

2

I

(A

´

)

VMAX

F

IN

P

PP

RG

R

F =3kW

R

F =2kW

R

F =1.5kW

R

F =1kW

R

F =500W

R

F =4kW

R

F =5kW

ControlVoltage(V)

0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

12

10

8

6

4

2

0

RelativeErrorto

MaximumGain

Absolute

Error

Absolute

Error

ControlVoltage(V)

0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

40

20

0

-20

-40

-60

-80

-100

A(V/V)=K ´

´

R

F

R

G

1

1+e

V

=0.85V

CTRL0

V

=90mV

SLOPE

V

-V

G0

G

V

SLOPE

(

)

Equation

Data

1500

1400

1300

1200

1100

1000

900

800

700

A

(V/V)

VMAX

1

10

100

NOTE: 3dBbandwidthwillvarywiththepackage.

SeetheApplicationsectionformoredetails.

-

VCA820

www.ti.com............................................................................................................................................ SBOS395C – OCTOBER 2007 – REVISED OCTOBER 2009

TYPICAL CHARACTERISTICS: VS = ±5V, DC Parameters

At TA = +25°C, RL = 100Ω, VG = +1V, and VIN = single-ended input on +VIN with –VIN at ground, unless otherwise noted.

MAXIMUM DIFFERENTIAL INPUT VOLTAGE

MAXIMUM GAIN ADJUST RANGE

vs GAIN RESISTOR

vs FEEDBACK RESISTOR

Figure 3.

Figure 4.

MAXIMUM GAIN ADJUST RANGE

GAIN ERROR BAND

vs PEAK-TO-PEAK OUTPUT VOLTAGE

vs GAIN CONTROL VOLTAGE

Figure 5.

Figure 6.

NOMINAL GAIN

RECOMMENDED RF and RG

vs CALCULATED GAIN

vs AVMAX

Figure 7.

Figure 8.

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