AD9670 datasheet(17/53 Pages) AD

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AD9670

Data Sheet

Rev. A | Page 16 of 52

1.4

1.2

1.0

0.8

0.6

0.4

110

FREQUENCY (MHz)

234

567

Figure 15. Short-Circuit, Input Referred Noise vs. Frequency

–132

–146

–5

CHANNEL GAIN (dB)

–144

–142

–140

–138

–136

–134

PGA GAIN = 21dB

Figure 16. Short-Circuit, Output Referred Noise vs. Channel Gain,

PGA Gain = 21 dB, VGAIN = 1.6 V

CHANNEL GAIN (dB)

PGA GAIN = 21dB

PGA GAIN = 27dB

PGA GAIN = 30dB

PGA GAIN = 24dB

LNA GAIN = 21.3dB

Figure 17. SNR vs. Channel Gain and PGA Gain, AOUT = −1.0 dBFS

CHANNEL GAIN (dB)

LNA GAIN = 17.9dB

LNA GAIN = 21.3dB

LNA GAIN = 15.6dB

PGA GAIN = 27dB

Figure 18. SNR vs. Channel Gain and LNA Gain, AOUT = −1.0 dBFS

–5

CHANNEL GAIN (dB)

2025

3035404550

LNA GAIN = 21.3dB

PGA GAIN = 21dB

PGA GAIN = 30dB

PGA GAIN = 27dB

PGA GAIN = 24dB

Figure 19. SNR vs. Channel Gain and PGA Gain, AIN = −45 dBm

–10

020

INPUT FREQUENCY (MHz)

–9

–8

–7

–6

–5

–4

–3

–2

–1

SPEED MODE = I (40MSPS)

LO BAND MODE

Figure 20. Antialiasing Filter Pass-Band Response,

LPF Cutoff = 1/3 × fSAMPLE, HPF = 1/12 × LPF Cutoff

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