ADS5294IPFPR datasheet(32/81 Pages) TI1

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0.02

0.1

10 15

Input Signal Frequency (MHz)

K=2

K=3

K=4

K=5

K=6

K=7

K=8

K=9

K=10

y(n) =

[x(n) x(n 1)+y(n 1)]

2 +1

ADS5294

SLAS776D – NOVEMBER 2011 – REVISED SEPTEMBER 2015

www.ti.com

Feature Description (continued)

9.3.3 Digital Highpass IIR Filter

DC offset is often observed at ADC input signals. For example, in ultrasound applications, the DC offset from

variable-gain amplifier (VGA) varies at different gains. Such a variable offset can introduce artifacts in ultrasound

images especially in Doppler modes. Analog filter between ADC and VGA can be used with added noise and

power. Digital filter achieves the same performance as analog filters and has more flexibility in fine tuning

multiple characteristics.

ADS5294 includes optional first-order digital high-pass (HP) IIR filter. Figure 46 shows the device block diagram

and transfer function.

(1)

Figure 46. HP Filter Block Diagram

Figure 47 shows the characteristics at k=2 to 10.

Figure 47. HP Filter Amplitude Response at K = 2 to 10

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