AD9877 datasheet(11/37 Pages) AD

11 / 37 page

AD9877

Rev. B | Page 10 of 36

TYPICAL PERFORMANCE CHARACTERISTICS

VAS = 3.3 V, VDS = 3.3 V, fOSCIN = 27 MHz, fSYSCLK = 216 MHz, fMCLK = 54 MHz (M = 8 and N = 4). ADC sample rate derived directly from

fOSCIN, RSET = 4.02 kΩ (IOUT = 10 mA), and 75 Ω DAC load, unless otherwise noted.

TYPICAL POWER CONSUMPTION CHARACTERISTICS

Transmitted 20 MHz single tone, unless otherwise noted.

fSYSCLK (MHz)

120

240

140

160

180

200

220

340

320

300

280

260

240

220

200

180

Figure 3. Power Consumption vs. Clock Speed, fSYSCLK

% DUTY CYCLE

100

310

300

290

280

270

260

250

Figure 4. Power Consumption vs. Transmit Burst Duty Cycle

DUAL SIDEBAND TRANSMIT SPECTRUM

See Table 11 for dual-tone generation.

FREQUENCY (MHz)

–20

–30

–50

–60

–70

–90

–80

–40

–10

Figure 5. Dual Sideband Spectral Plot, fC = 5 MHz, f = 1 MHz,

RSET = 4.02 KΩ, DAC Gain = 7.5 dB, RBW = 1 kHz

FREQUENCY (MHz)

–20

–30

–50

–60

–70

–90

–80

–40

–10

Figure 6. Dual Sideband Spectral Plot, fC = 65 MHz, f = 1 MHz,

RSET = 4.02 KΩ, (IOUT = 10 mA), RBW = 1 kHz

SINGLE SIDEBAND TRANSMIT SPECTRUM

FREQUENCY (MHz)

110

–20

–30

–50

–60

–70

–90

–80

–40

–10

100

Figure 7. Single Sideband @ 65 MHz, RBW = 2 kHz, fC = 66 MHz,

f = 1 MHz, RSET = 4.02 KΩ, DAC gain = 7.5 dB

FREQUENCY (MHz)

110

–20

–30

–50

–60

–70

–90

–80

–40

–10

100

Figure 8. Single Sideband @ 42 MHz, RBW = 2 kHz, fC = 43 MHz,

f = 1 MHz, RSET = 4.02 KΩ, DAC gain = 7.5 dB

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