LTC6602 datasheet(32/40 Pages) AD

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LTC6601-2

66012f

APPLICATIONS INFORMATION

Figure 13. Modiﬁed Filter Topology and Equations

–

VOUT(DIFF)

66012 F13

VIN(DIFF)

C3A

C3B

49.9Ω

R4A

REXT

R4B

R4 = R4A + R4B + REXT

C3 = C3A /2 (C3A = C3B)

f3dB =

fO •

6089 •

3568 • Q4 1788 • Q2 + 447

()+1.287•105 •2•Q2 1

()

507.6 • Q

Q =

0.2236 • fO •

2.109 • 105 •

9.891• 1012 •f3dB

5.486 • 109 •fO

()+120• 5.526•109 •f

3dB

2 + 3.082 • 106 •fO2

()

16 • fO

2 • 8.29 • 109 •f3dB2 + 4.127 •109 •fO2

() 6.638•1010 •f

3dB

()

R4 =

1.25 • 104 •C1• Q • R2

559 • C1• R2 •

C2 + 2• C3

50 • Q • C1• 125 • GAIN + R2 + 125

() C2•R2

()

VOUT(DIFF)

VIN(DIFF)

= –

GAIN

R2 • R3 • C1• C2 + 2• C3

()

S2 +

R1• R2• 2• R3 + R4

()+R3•R4

()+R2•R3•R4

R1•R2 • R3 •R4 • C2 + 2• C3

()

•S +

R2 • R3 • C1• C2 + 2• C3

()

GAIN = –

VOUT(DIFF)

VIN(DIFF)

= – R2

fO =

2• •R2 • R3 • C1• C2 + 2• C3

()

Q =

•

+ 2• C3

1+ 1+|GAIN|+ 2•

•

–

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