AD8372

Rev. 0 | Page 11 of 16

0.1µF

0.1µF

33µH

142Ω

33Ω

33Ω

142Ω

5V

5V

50Ω

AC

1:3

½

AD8372

VGA

0.1µF

0.1µF

0.1µF

0.1µF

33µH

5V

VIN+

VIN–

AD9445

14-BIT ADC

14

Figure 14. AD8372 Driving an AD9445 ADC

–150

–140

–130

–120

–110

–100

–80

–70

–90

–60

–40

–30

–50

–20

–10

0

FREQUENCY (MHz)

5.25 10.50 15.75 21.00 26.25 31.50 36.75 42.00 47.25 52.50

0

5

6

4

1

2

3

ENCODE: 105MHz

SAMPLES: 32768

ANALOG: 19.8766MHz

FUND: –1.053dBFS

2ND: –74.55dBc

3RD: –86.45dBc

4TH: –91.35dBc

5TH: –89.57dBc

6TH: –91.15dBc

SNR: 58.12dBc

SNRFS: 59.18dBc

THD: –73.99dBc

SINAD: 58.01dBc

SFDR: 74.73dBc

WO SPUR: –85.5dBc

NOISE FLOOR: –101.3dB

FUND LEAK: 100

HARM LEAK: 3

DC LEAK: 6

Figure 15. 74.5 dB SFDR Performance of the AD8372 Driving the AD9445 ADC