AD9278BBCZ datasheet(14/45 Pages) AD

14 / 45 page

Data Sheet

AD9278

Rev. A | Page 13 of 44

TYPICAL PERFORMANCE CHARACTERISTICS

TGC MODE

fSAMPLE = 40 MSPS, fIN = 5 MHz, RS = 50 Ω, LNA gain = 21.3 dB, LNA bias = mid-high, PGA gain = 24 dB, GAIN− = 0.8 V, AAF LPF

cutoff = fSAMPLE/3.0, HPF cutoff = LPF cutoff/12.00 (default).

1.0

0.8

0.6

0.4

0.2

–0.2

–0.4

–0.6

–0.8

–1.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

GAIN+ (V)

Figure 6. Gain Error vs. GAIN+

550

500

450

400

350

300

250

200

150

100

–8 –7 –6 –5 –4 –3 –2 –1

CODES

1,000,000 TOTAL HITS

Figure 7. Output-Referred Noise Histogram, GAIN+ = 0.0 V

220

240

200

180

160

140

120

100

–8 –7 –6 –5 –4 –3 –2 –1

CODES

1,000,000 TOTAL HITS

Figure 8. Output-Referred Noise Histogram, GAIN+ = 1.6 V

3.0

2.5

2.0

1.5

1.0

0.5

FREQUENCY (MHz)

Figure 9. Short-Circuit, Input-Referred Noise vs. Frequency,

LNA Gain = 21.3 dB, PGA Gain = 30 dB, GAIN+ = 1.6 V

–128

–130

–132

–134

–136

–138

–140

–142

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

GAIN+ (V)

LNA GAIN = 21.3dB

LNA GAIN = 17.9dB

LNA GAIN = 15.6dB

Figure 10. Short-Circuit, Output-Referred Noise vs. GAIN+

1.0

0.4

0.6

0.8

1.2

1.4

1.6

GAIN+ (V)

Figure 11. SNR vs. GAIN+, AOUT = −1.0 dBFS

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