AFE7950 datasheet(34/126 Pages) TI2

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4.12.1 TX Typical Characteristics 800MHz (continued)

Typical values at TA = +25°C with nominal supplies. Default conditions: TX input data rate = 491.52MSPS, fDAC =

11796.48MSPS (24x interpolation), interleave mode, 1st Nyquist zone output, PLL clock mode with fREF = 491.52MHz, AOUT =

–1dBFS, DSA = 0dB, Sin(x)/x enabled, DSA calibrated

Tone Spacing (MHz)

120

160

200

240

280

320

360

400

-83

-82

-81

-80

-79

-78

-77

-76

-75

-74

-73

-72

-40qC

25qC

105qC

fDAC = 11796.48MSPS, straight mode, fCENTER = 0.85GHz,

matching at 0.8GHz, –13dBFS each tone, worst channel

Figure 4-27. TX IMD3 vs Tone Spacing and Temperature at

0.85GHz

Pout/tone (dBFS)

-37

-34

-31

-28

-25

-22

-19

-16

-13

-10

-7

-100

-95

-90

-85

-80

-75

-70

-65

-60

1TX

2TX

3TX

4TX

fDAC = 5898.24MSPS, straight mode, fCENTER = 0.85GHz,

fSPACING = 20MHz, matching at 0.8GHz

Figure 4-28. TX IMD3 vs Digital Level at 0.85GHz

Pout/tone (dBFS)

-37

-34

-31

-28

-25

-22

-19

-16

-13

-10

-7

-100

-95

-90

-85

-80

-75

-70

-65

-60

1TX

2TX

3TX

4TX

fDAC = 8847.36MSPS, straight mode, fCENTER = 0.85GHz,

fSPACING = 20MHz, matching at 0.8GHz

Figure 4-29. TX IMD3 vs Digital Level at 0.85GHz

Pout/tone (dBFS)

-37

-34

-31

-28

-25

-22

-19

-16

-13

-10

-7

-105

-100

-95

-90

-85

-80

-75

-70

-65

-60

1TX

2TX

3TX

4TX

fDAC = 11796.48MSPS, interleave mode, fCENTER = 0.85GHz,

fSPACING = 20MHz, matching at 0.8GHz

Figure 4-30. TX IMD3 vs Digital Level at 0.85GHz

Output Frequency (MHz)

600

750

900

1050

1200

1350

1500

-159

-158

-157

-156

-155

-154

-153

-152

-151

-150

Aout=-30dBFS

Aout=-20dBFS

Aout=-12dBFS

Aout=-6dBFS

Aout=-1dBFS

Matching at 2.6GHz, Single tone, fDAC = 11.79648GSPS,

interleave mode, 40MHz offset, DSA = 0dB

Figure 4-31. TX Single Tone Output Noise vs Frequency and

Amplitude at 0.85GHz

TM1.1, POUT_RMS = –13dBFS

Figure 4-32. TX 20-MHz LTE Output Spectrum at 0.85 GHz

AFE7950-SP

SBASAG7A – MARCH 2024 – REVISED AUGUST 2024

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