VCA2615

更新时间： 2024-11-02 03:20:31

品牌	Logo	应用领域
德州仪器 - TI		放大器
页数	文件大小	规格书
29页	742K
描述
Dual, Low-Noise Variable-Gain Amplifier with Preamp

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VCA2615 数据手册

VCA2615

SBOS316C − JULY 2005 − REVISED SEPTEMBER 2005

Dual, Low-Noise

Variable-Gain Amplifier with Preamp

F_DEATURES

DESCRIPTION

VERY LOW NOISE: 0.7nV//Hz

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.

LOW-NOISE PREAMP (LNP)

− Active Termination

− Programmable Gains: 3, 12, 18, 22dB

− Programmable Input Impedance (R )

− Buffered, Differential Outputs for CW

Processing

− Excellent Input Signal Handling

Capabilities

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 (3, 12, 18, 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.

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

BANDWIDTH: 42MHz

HARMONIC DISTORTION: −55dB

5V SINGLE SUPPLY

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.

LOW-POWER: 154mW/Channel

POWER-DOWN MODES

SMALL QFN-48 PACKAGE (7x7mm)

A_DPPLICATIONS

MEDICAL AND INDUSTRIAL ULTRASOUND

SYSTEMS

The VCA2615 operates on a single +5V supply and is

available in a small QFN-48 package (7x7mm).

− Suitable for 10-Bit and 12-Bit Systems

TEST EQUIPMENT

−

FB1 FB2 FB3 FB4 LNP_OUT

LNP_OUT

VCA_IN

H/L

(0dB or

+6dB)

Feedback

Resistors

LNP_IN

VCA_OUT

LNP

VGA

MUX

−

LNP_IN

(3, 12, 18, 22dB)

1/2 VCA2615

52dB

Range

G1 G1

VCA_INSEL

V_CNTLV_CLMP

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.

All trademarks are the property of their respective owners.

ꢀꢁ ꢂ ꢃꢄ ꢅ ꢆꢇ ꢂꢈ ꢃ ꢉꢆꢉ ꢊꢋ ꢌꢍ ꢎ ꢏꢐ ꢑꢊꢍꢋ ꢊꢒ ꢓꢔ ꢎ ꢎ ꢕꢋꢑ ꢐꢒ ꢍꢌ ꢖꢔꢗ ꢘꢊꢓ ꢐꢑꢊ ꢍꢋ ꢙꢐ ꢑꢕꢚ ꢀꢎ ꢍꢙꢔ ꢓꢑꢒ

ꢓ ꢍꢋ ꢌꢍꢎ ꢏ ꢑꢍ ꢒ ꢖꢕ ꢓ ꢊ ꢌꢊ ꢓ ꢐ ꢑꢊ ꢍꢋꢒ ꢖ ꢕꢎ ꢑꢛꢕ ꢑꢕ ꢎ ꢏꢒ ꢍꢌ ꢆꢕꢜ ꢐꢒ ꢇꢋꢒ ꢑꢎ ꢔꢏ ꢕꢋꢑ ꢒ ꢒꢑ ꢐꢋꢙ ꢐꢎ ꢙ ꢝ ꢐꢎ ꢎ ꢐ ꢋꢑꢞꢚ

ꢀꢎ ꢍ ꢙꢔꢓ ꢑ ꢊꢍ ꢋ ꢖꢎ ꢍ ꢓ ꢕ ꢒ ꢒ ꢊꢋ ꢟ ꢙꢍ ꢕ ꢒ ꢋꢍꢑ ꢋꢕ ꢓꢕ ꢒꢒ ꢐꢎ ꢊꢘ ꢞ ꢊꢋꢓ ꢘꢔꢙ ꢕ ꢑꢕ ꢒꢑꢊ ꢋꢟ ꢍꢌ ꢐꢘ ꢘ ꢖꢐ ꢎ ꢐꢏ ꢕꢑꢕ ꢎ ꢒꢚ

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与VCA2615相关器件

型号	品牌	获取价格	描述	数据表
VCA2615PFBR	TI	获取价格	Dual, Low-Noise
VCA2615PFBT	TI	获取价格	Dual, Low-Noise
VCA2615RGZR	TI	获取价格	Dual, Low-Noise Variable-Gain Amplifier with Preamp
VCA2615RGZT	TI	获取价格	Dual, Low-Noise Variable-Gain Amplifier with Preamp
VCA2616	BB	获取价格	Dual, Variable-Gain Amplifier with Low-Noise Preamp
VCA2616	TI	获取价格	High Gain Adjust Range, Wideband, VARIABLE GAIN AMPLIFIER
VCA2616	TAOS	获取价格	Dual, Variable-Gain Amplifier with Low-Noise Preamp
VCA2616YR	TAOS	获取价格	Dual, Variable-Gain Amplifier with Low-Noise Preamp
VCA2616YT	TAOS	获取价格	Dual, Variable-Gain Amplifier with Low-Noise Preamp
VCA2617	BB	获取价格	Dual, Variable Gain Amplifier

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