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參數(shù)資料
| 型號： | AD8335ACPZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP VGA QUAD 64LFCSP |
| 產(chǎn)品變化通告： | AD8335 Metal Mask Change 12/Jul/2010 |
| 標(biāo)準包裝： | 750 |
| 系列： | X-AMP® |
| 類型： | 可變增益放大器 |
| 應(yīng)用： | 信號處理 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 64-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 64-LFCSP-VQ（9x9） |
| 包裝： | 帶卷 (TR) |
| 配用： | AD8335-EVALZ-ND - BOARD EVALUATION FOR AD8335 |
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AD8335
Data Sheet
Rev. B | Page 20 of 28
APPLICATIONS INFORMATION
ULTRASOUND
The primary application for the AD8335 is medical ultrasound.
Figure 57 shows a simplified block diagram of an ultrasound
system. The most critical function of an ultrasound system is
the time gain control (TGC) compensation for physiological
signal attenuation. Because the attenuation of ultrasound signals is
exponential with respect to distance (time), a linear-in-dB VGA
is the optimal solution.
Key requirements in an ultrasound signal chain are very low
noise, active input termination, fast overload recovery, low
power, and differential drive to an ADC. Because ultrasound
machines use beamforming techniques requiring large binary
weighted numbers (for example, 32 to 512) of channels, the
lowest power at the lowest possible noise is of key importance.
Most modern machines use digital beamforming. In this technique,
the signal is converted to digital format immediately following
the TGC amplifier; beamforming is done digitally.
Typical ADC resolution in general purpose machines is 10 bits
with sampling rates greater than 40 MSPS, and high-end systems
use 12 bits.
Power consumption and low cost are of primary importance in
low-end and portable ultrasound machines, and the AD8335 is
designed for these criteria.
For additional information regarding ultrasound systems, refer
to “How Ultrasound System Considerations Influence Front-End
Component Choice”, Analog Dialogue, Vol. 36, No. 3, May–July
BEAMFORMER
CENTRAL CONTROL
Rx BEAMFORMER
(B AND F MODES)
COLOR
DOPPLER (PW)
PROCESSING
(F MODE)
IMAGE AND
MOTION
PROCESSING
(B MODE)
SPECTRAL
DOPPLER
PROCESSING
MODE
DISPLAY
AUDIO
OUTPUT
TX BEAMFORMER
CW (ANALOG)
BEAMFORMER
LNAs
TRANSDUCER
ARRAY
128, 256 ETC.
ELEMENTS
BIDIRECTIONAL
CABLE
HV
MUX/
DEMUX
T/R
SWITCHES
TX HV AMPs
MULTICHANNEL
TGC USES MANY VGAs
TGC
TIME GAIN COMPENSATION
04
97
6-
05
3
VGAs
AD8335
Figure 57. Simplified Ultrasound System Block Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD8336ACPZ-WP | IC VGA GP SGL-ENDED 16-LFCSP |
| AD8337BCPZ-REEL7 | IC AMP VGA LOW NOISE 8-LFCSP |
| AD834AQ | IC MULTIPLIER 4-QUADRANT 8-CDIP |
| AD835AR | IC MULTIPLIER 4-QUADRANT 8-SOIC |
| AD8465WBCPZ-R7 | IC COMPARATOR LVDS R-R 12LFCSP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8335EVAL | 制造商:Analog Devices 功能描述:EVAL BOARD ((NS)) |
| AD8335-EVAL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Quad Low Noise, Low Cost Variable Gain Amplifier |
| AD8335-EVALZ | 功能描述:BOARD EVALUATION FOR AD8335 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 運算放大器 系列:X-AMP® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準包裝:1 系列:- |
| AD8336 | 制造商:AD 制造商全稱:Analog Devices 功能描述:General-Purpose, −55 to +125, Wide Bandwidth, DC-Coupled VGA |
| AD8336ACPZ | 制造商:Analog Devices 功能描述:SP AMP VARIABLE GAIN AMP SGL 12V 16LFCSP EP - Bulk |
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