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参数资料
| 型号： | VCA2615PFBR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP48 |
| 封装： | GREEN, PLASTIC, TQFP-48 |
| 文件页数： | 1/33页 |
| 文件大小： | 1122K |
| 代理商： | VCA2615PFBR |
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FEATURES
D VERY LOW NOISE: 0.7nV//Hz
D LOW-NOISE PREAMP (LNP)
Active Termination
Programmable Gains: 3, 12, 18, 22dB
Programmable Input Impedance (RF)
Buffered, Differential Outputs for CW
Processing
Excellent Input Signal Handling
Capabilities
D LOW-NOISE VARIABLE-GAIN AMPLIFIER
High/Low-Mode (0/+6dB)
52dB Gain Control Range
Linear Control Response: 22dB/V
Switchable Differential Inputs
Adjustable Output Clipping-Level
D BANDWIDTH: 42MHz
D HARMONIC DISTORTION: 55dB
D 5V SINGLE SUPPLY
D LOW-POWER: 154mW/Channel
D POWER-DOWN MODES
APPLICATIONS
D MEDICAL AND INDUSTRIAL ULTRASOUND
SYSTEMS
Suitable for 10-Bit and 12-Bit Systems
D TEST EQUIPMENT
DESCRIPTION
The VCA2615 is a dual-channel, variable gain amplifier
consisting of a Low-Noise Preamplifier (LNP) and a Variable-
Gain Amplifier (VGA). This combination along with the device
features makes it well-suited for a variety of ultrasound
systems.
The LNP offers a high level of flexibility to adapt to a wide range
of systems and probes. The LNP gain can be programmed to
one of four settings (3dB, 12dB, 18dB, 22dB), while
maintaining
excellent
noise
and
signal
handling
characteristics. The input impedance of the LNP can be
controlled by selecting one of the built-in feedback resistors.
This active termination allows the user to closely match the
LNP to a given source impedance, resulting in optimized
overall system noise performance. The differential LNP
outputs are provided either as buffered outputs for further CW
processing, or fed directly into the variable-gain amplifier
(VGA). Alternatively, an external signal can be applied to the
differential VGA inputs through a programmable switch.
Following a linear-in-dB response, the gain of the VGA can be
varied over a 52dB range with a 0.2V to 2.5V control voltage
common to both channels of the VCA2615. In addition, the
overall gain can be switched between a 0dB and +6dB
postgain, allowing the user to optimize the output swing of
VCA2615 for a variety of high-speed Analog-to-Digital
Converters (ADCs). As a means to improve system overload
recovery time, the VCA2615 provides an internal clipping
function where an externally applied voltage sets the desired
clipping level.
The VCA2615 operates on a single +5V supply and is
available in a small QFN-48 (7x7mm) or TQFP package.
MUX
52dB
Range
Feedback
Resistors
(3, 12, 18, 22dB)
LNP
+1
1/2 VCA2615
LNP
IN+
LNP
OUT
FB1 FB2 FB3 FB4
+1
LNP
OUT+
VCA
IN+
VCA
IN
H/L
(0dB or
+6dB)
G1 G1
V
CNTL
V
CLMP
VCA
INSEL
LNP
IN
VCA
OUT+
VCA
OUT
VGA
VCA2615
SBOS316D JULY 2005 REVISED OCTOBER 2008
Dual, Low-Noise
Variable-Gain Amplifier with Preamp
www.ti.com
Copyright
20052008, Texas Instruments Incorporated
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.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
All trademarks are the property of their respective owners.
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相关代理商/技术参数 |
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|---|---|
| VCA2615PFBT | 功能描述:特殊用途放大器 2Ch Variable Gain Amplifier RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| VCA2615RGZR | 功能描述:特殊用途放大器 2-Channel Variable Gain Amplifier RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| VCA2615RGZRG4 | 功能描述:特殊用途放大器 2-Channel Variable Gain Amplifier RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| VCA2615RGZT | 功能描述:特殊用途放大器 2-Channel Variable Gain Amplifier RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| VCA2615RGZTG4 | 功能描述:特殊用途放大器 2-Channel Variable Gain Amplifier RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
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