AD8331ARQZ-R7 datasheet(34/40 Pages) AD

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AD8331/AD8332/AD8334

Rev. E | Page 34 of 40

INH

LNA

5Ω

200Ω

50Ω

LMD

LOP

ADG736

LON

0.1µF

18nF

280Ω

1.13kΩ

AD8332

5Ω

SELECT RFB

Using the EVAL-AD8332/AD9238 evaluation board and a high

speed ADC FIFO evaluation kit connected to a laptop, an FFT

can be performed on the AD8332. With the on-board clock of

20 MHz, minimal low-pass filtering, and both channels driven

with a 1 MHz filtered sine wave, the THD is −75 dB, noise floor

is −93 dB, and HD2 is −83 dB.

HIGH DENSITY QUAD LAYOUT

The AD8334 is the ideal solution for applications with limited

board space. Figure 94 represents four channels routed to and

away from this very compact quad VGA. Note that none of the

signal paths crosses and that all four channels are spaced apart

to eliminate crosstalk.

Figure 90. Accommodating Multiple Sources

ULTRASOUND TGC APPLICATION

In this example, all of the components shown are 0402 size;

however, the same layout is executable at the expense of slightly

more board area. The sketch also assumes that both sides of the

printed circuit board are available for components, and that the

bypass and power supply decoupling circuitry is located on the

wiring side of the board.

The AD8332 ideally meets the requirements of medical and

industrial ultrasound applications. The TGC amplifier is a key

subsystem in such applications, because it provides the means

for echolocation of reflected ultrasound energy.

Figure 91 through Figure 93 are schematics of a dual, fully

differential system using the AD8332 and the AD9238, 12-bit

high speed ADC with conversion speeds as high as 65 MSPS.

AD8331ARQZ-R7 数据表(PDF) 34 Page - Analog Devices

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