Datasheet > VCA821_12

VCA821_12

更新时间： 2024-11-03 12:26:35

品牌	Logo	应用领域
德州仪器 - TI		放大器
页数	文件大小	规格书
37页	1644K
描述
Ultra-Wideband, > 40dB Gain Adjust Range, Linear in dB VARIABLE GAIN AMPLIFIER

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VCA821_12 数据手册

VCA821

www.ti.com ....................................................................................................................................... SBOS407B–DECEMBER 2007–REVISED DECEMBER 2008

Ultra-Wideband, > 40dB Gain Adjust Range, Linear in dB

VARIABLE GAIN AMPLIFIER

FEATURES

DESCRIPTION

•

710MHz SMALL-SIGNAL BANDWIDTH

(G = +2V/V)

The VCA821 is a dc-coupled, wideband, linear in dB,

continuously variable, voltage-controlled gain

amplifier. It provides differential input to

single-ended conversion with a high-impedance gain

control input used to vary the gain down 40dB from

the nominal maximum gain set by the gain resistor

(R_G) and feedback resistor (R_F).

•

320MHz, 4V_PPBANDWIDTH (G = +10V/V)

0.1dB GAIN FLATNESS to 135MHz

2500V/µs SLEW RATE

•

> 40dB GAIN ADJUST RANGE

HIGH GAIN ACCURACY: 20dB ±0.3dB

HIGH OUTPUT CURRENT: ±90mA

The VCA821 internal architecture consists of two

input buffers and an output current feedback amplifier

stage integrated with a multiplier core to provide a

complete variable gain amplifier (VGA) system that

does not require external buffering. The maximum

gain is set externally with two resistors, providing

flexibility in designs. The maximum gain is intended

to be set between 6dB and 32dB. Operating from ±5V

supplies, the gain control voltage for the VCA821

adjusts the gain linearly in dB as the control voltage

varies from 0V to +2V. For example, set at a

maximum gain of 20dB, the VCA821 provides 20dB,

at V_G= +2V, to less than –20dB at V_G= 0V. The

VCA821 offers excellent gain linearity. For a 20dB

maximum gain, and a gain-control input voltage

varying between +1V and +2V, the gain does not

deviate by more than ±0.3dB (maximum at +25°C).

APPLICATIONS

•

AGC RECEIVERS with RSSI

DIFFERENTIAL LINE RECEIVERS

PULSE AMPLITUDE COMPENSATION

VARIABLE ATTENUATORS

VOLTAGE-TUNABLE ACTIVE FILTERS

R_F

V_IN1

+V_IN

R_G+

R_S

R_L

VCA821

R₁

C₁

R_G

V_OUT

C_L

R_G-

V_IN2

-V_IN

20W

R_S

VCA821 RELATED PRODUCTS

GAIN

ADJUST

RANGE

(dB)

INPUT

NOISE

(nV/√Hz)

SIGNAL

BANDWIDTH

(MHz)

Differential Equalizer

SINGLES

VCA810

—

DUALS

—

2.4

1.25

Equalized Frequency Response

VCA2612

VCA2613

VCA2615

VCA2617

—

0.8

4.1

8.2

6.0

8.2

6.0

Initial Frequency Response

of the VCA821 with RC Load

-3

-6

-9

—

VCA820

VCA821

VCA822

VCA824

150

420

150

420

-12

-15

-18

-21

-24

—

10M

100M

Frequency (Hz)

Differential Equalization of an RC Load

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

X2Y is a trademark of X2Y Attenuators LLC.

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...37

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与VCA821_12相关器件

型号	品牌	获取价格	描述	数据表
VCA821ID	TI	获取价格	Ultra-Wideband, > 40dB Gain Adjust Range, Linear in dB VARIABLE GAIN AMPLIFIER
VCA821IDG4	TI	获取价格	Wideband, > 40dB Adjust Range, Linear in dB Variable Gain Amplifier 14-SOIC -40 to
VCA821IDGSR	TI	获取价格	Ultra-Wideband, > 40dB Gain Adjust Range, Linear in dB VARIABLE GAIN AMPLIFIER
VCA821IDGSRG4	TI	获取价格	SPECIALTY ANALOG CIRCUIT, PDSO14, GREEN, PLASTIC, MSOP-10
VCA821IDGST	TI	获取价格	Ultra-Wideband, > 40dB Gain Adjust Range, Linear in dB VARIABLE GAIN AMPLIFIER
VCA821IDGSTG4	TI	获取价格	SPECIALTY ANALOG CIRCUIT, PDSO14, GREEN, PLASTIC, MSOP-10
VCA821IDR	TI	获取价格	Ultra-Wideband, > 40dB Gain Adjust Range, Linear in dB VARIABLE GAIN AMPLIFIER
VCA821IDRG4	TI	获取价格	SPECIALTY ANALOG CIRCUIT, PDSO14, GREEN, PLASTIC, MS-012AB, SOIC-14
VCA822	TI	获取价格	Wideband, > 40dB Gain Adjust Range, Linear in V/V VARIABLE GAIN AMPLIFIER
VCA822ID	TI	获取价格	Wideband, > 40dB Gain Adjust Range, Linear in V/V VARIABLE GAIN AMPLIFIER

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