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可编程和可变增益放大器（PGA 和 VGA）

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

VCA821

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数据表 立即订购

产品详情

PGA/VGA VGA Number of channels 1 BW at Acl (MHz) 710 Vs (max) (V) 12 Vs (min) (V) 7 Acl, min spec gain (V/V) 2 Gain (max) (dB) 40 Slew rate (typ) (V/µs) 2500 Operating temperature range (°C) -40 to 85 Features Analog Gain Set, Differential to Single-ended conversion Rating Catalog
PGA/VGA VGA Number of channels 1 BW at Acl (MHz) 710 Vs (max) (V) 12 Vs (min) (V) 7 Acl, min spec gain (V/V) 2 Gain (max) (dB) 40 Slew rate (typ) (V/µs) 2500 Operating temperature range (°C) -40 to 85 Features Analog Gain Set, Differential to Single-ended conversion Rating Catalog
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 VPP 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 VPP 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 (RG) and feedback resistor (RF).

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 VG = +2 V, to less than –20 dB at VG = 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 (RG) and feedback resistor (RF).

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 VG = +2 V, to less than –20 dB at VG = 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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技术文档

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类型 项目标题 下载最新的英语版本 日期
* 数据表 VCA821 Ultra-Wideband, > 40-dB Gain Adjust Range, Linear in dB Variable Gain Amplifier 数据表 (Rev. D) PDF | HTML 2016年 5月 24日
电子书 The Signal e-book: 有关运算放大器设计主题的博客文章汇编 下载英文版本 2018年 1月 31日
应用手册 Implementating a Variable-Length Cat5e Cable Equalizer 2010年 4月 25日
应用手册 Wireline Data Transmission and Reception 2010年 1月 27日
应用手册 所选封装材料的热学和电学性质 2008年 10月 16日

设计和开发

如需其他信息或资源，请查看下方列表，点击标题即可进入详情页面。

评估板

DEM-VCA-MSOP-1A — DEM-VCA-MSOP-1A

用户指南: PDF
TI.com 上无现货
评估板

DEM-VCA-SO-1B — DEM-VCA-SO-1B

用户指南: PDF
TI.com 上无现货
仿真模型

VCA821 PSpice Model (Rev. A)

SBOM365A.ZIP (33 KB) - PSpice Model
下载
仿真模型

VCA821 TINA-TI Reference Design

SBOM366.TSC (52 KB) - TINA-TI Reference Design
下载
仿真模型

VCA821 TINA-TI Spice Model

SBOM367.TSM (19 KB) - TINA-TI Spice Model
下载
模拟工具

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模拟工具

TINA-TI — 基于 SPICE 的模拟仿真程序

TINA-TI 提供了 SPICE 所有的传统直流、瞬态和频域分析以及更多。TINA 具有广泛的后处理功能，允许您按照希望的方式设置结果的格式。虚拟仪器允许您选择输入波形、探针电路节点电压和波形。TINA 的原理图捕获非常直观 - 真正的“快速入门”。

TINA-TI 安装需要大约 500MB。直接安装，如果想卸载也很容易。我们相信您肯定会爱不释手。

TINA 是德州仪器 (TI) 专有的 DesignSoft 产品。该免费版本具有完整的功能，但不支持完整版 TINA 所提供的某些其他功能。

如需获取可用 TINA-TI 模型的完整列表，请参阅：SpiceRack - 完整列表 

需要 HSpice (...)

用户指南: PDF
下载英文版本 (Rev.A): PDF
了解详情
封装 引脚数 下载
SOIC (D) 14 了解详情
VSSOP (DGS) 10 了解详情
应遵守 TI 的评估模块标准条款与条件.

订购和质量

包含信息：
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/时基故障估算
  • 材料成分
  • 认证摘要
  • 持续可靠性监测

支持与培训

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