VCA821

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宽带、大于 40dB 调节范围、dB 线性可变增益放大器

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数据表

document-pdfAcrobat VCA821 Ultra-Wideband, > 40-dB Gain Adjust Range, Linear in dB Variable Gain Amplifier 数据表 (Rev. D) (英语) PDF | HTML

产品详情

PGA/VGA

VGA

Number of channels

1

Vs (min) (V)

7

Vs (max) (V)

12

BW at Acl (MHz)

710

Acl, min spec gain (V/V)

2

Gain (max) (dB)

40

Features

Analog Gain Set, Differential to Single-ended conversion

Slew rate (typ) (V/µs)

2500

Iq per channel (typ) (mA)

34

Rating

Catalog

Operating temperature range (°C)

-40 to 85

PGA/VGA

VGA

Number of channels

1

Vs (min) (V)

7

Vs (max) (V)

12

BW at Acl (MHz)

710

Acl, min spec gain (V/V)

2

Gain (max) (dB)

40

Features

Analog Gain Set, Differential to Single-ended conversion

Slew rate (typ) (V/µs)

2500

Iq per channel (typ) (mA)

34

Rating

Catalog

Operating temperature range (°C)

-40 to 85

SOIC (D)

14

51.9 mm² 8.65 x 6

VSSOP (DGS)

10

14.7 mm² 3 x 4.9

710-MHz Small-Signal Bandwidth
(G = +2 V/V)
320 MHz, 4 V_PP Bandwidth (G = +10 V/V)
0.1-dB Gain Flatness to 135 MHz
2500 V/µs Slew Rate
> 40-dB Gain Adjust Range
High Gain Accuracy: 20 dB ±0.3 dB
High Output Current: ±90 mA

710-MHz Small-Signal Bandwidth
(G = +2 V/V)
320 MHz, 4 V_PP Bandwidth (G = +10 V/V)
0.1-dB Gain Flatness to 135 MHz
2500 V/µs Slew Rate
> 40-dB Gain Adjust Range
High Gain Accuracy: 20 dB ±0.3 dB
High Output Current: ±90 mA

The VCA821 device is a DC-coupled, wideband, linear in dB, continuously variable, voltage-controlled gain amplifier. It provides a differential input to single-ended conversion with a high-impedance gain control input used to vary the gain down 40 dB from the nominal maximum gain set by the gain resistor (R_G) and feedback resistor (R_F).

The VCA821 device 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 6 dB and 32 dB. Operating from ±5-V supplies, the gain control voltage for the VCA821 device adjusts the gain linearly in dB as the control voltage varies from 0V to +2 V. For example, set at a maximum gain of 20 dB, the VCA821 device provides 20 dB, at V_G = +2 V, to less than –20 dB at V_G = 0 V. The VCA821 device offers excellent gain linearity. For a 20-dB maximum gain, and a gain-control input voltage varying between +1 V and +2 V, the gain does not deviate by more than ±0.3 dB (maximum at +25°C).

The VCA821 device is a DC-coupled, wideband, linear in dB, continuously variable, voltage-controlled gain amplifier. It provides a differential input to single-ended conversion with a high-impedance gain control input used to vary the gain down 40 dB from the nominal maximum gain set by the gain resistor (R_G) and feedback resistor (R_F).

The VCA821 device 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 6 dB and 32 dB. Operating from ±5-V supplies, the gain control voltage for the VCA821 device adjusts the gain linearly in dB as the control voltage varies from 0V to +2 V. For example, set at a maximum gain of 20 dB, the VCA821 device provides 20 dB, at V_G = +2 V, to less than –20 dB at V_G = 0 V. The VCA821 device offers excellent gain linearity. For a 20-dB maximum gain, and a gain-control input voltage varying between +1 V and +2 V, the gain does not deviate by more than ±0.3 dB (maximum at +25°C).

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