ISLA212P20 datasheet(7/25 Pages) INTERSIL

Nome de Peças	ISLA212P20

Descrição Electrónicos	Ultra High Performance Broadband 12 to 16-Bit Data Acquisition Platform

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Fabricante Electrônico	INTERSIL [Intersil Corporation]

Página de início	http://www.intersil.com/cda/home

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Application Note 1837

7

AN1837.0

May 3, 2013

This is set up with the source V1 at a “2” amplitude to generate

the response from the input to C1 to VOUT as shown in Figure 7.

The amplifier circuit is expecting a 50Ω source impedance for

best flatness. The extrinsic one shown in Figure 6 will produce a

6dB loss to the board input of Figure 4 but simulating with a

source set to “2” will remove that matching loss from the VOUT

plot. The simulated response shows exceptional flatness down to

100kHz and about -1dB rolloff at 100MHz. That rolloff will be

equalized a bit with a slight peaking in the interstage filter

design.

INTERSTAGE FILTER FROM THE FDA OUTPUTS TO

THE ADC

The signal path from the ISL55210 to the ADC is AC coupled,

allowing the amplifier and ADC to operate at the common-mode

voltage that optimize each device’s performance. As delivered,

the differential output of the ISL55210 operate with a common

mode voltage that is left to default to the internal 1.2V value.

This can be adjusted to different set point via an optional path.

The interstage passive circuit provides an AC coupled, 3rd order

low pass filter. Built into this filter are an ADC common mode

voltage servo loop which controls the common-mode DC voltage

delivered to the ADC input pins and a wideband passive sense

path going differential to single ended to directly measure the

response shape to the ADC inputs. The circuit as delivered is

shown in Figure 8.

FIGURE 7. PREDICTED RESPONSE SHAPE TO VOUT FOR A 50Ω

SOURCE TO THE INPUT OF C1

4

6

8

10

12

14

18

10k

1M

10M

100M

1G

FREQUENCY (Hz)

16

100k

20

FIGURE 8. OUTPUT INTERFACE FROM ISL55210 TO THE ISLA214P50 DIFFERENTIAL INPUTS

Nº de peça semelhante - ISLA212P20

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Intersil Corporation	ISLA212P20	1Mb / 37P	14-Bit, 500MSPS ADC Programmable Built-in Test Patterns
	ISLA212P20	1Mb / 38P	12-Bit, 500MSPS ADC Programmable Built-in Test Patterns
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