AFE7900IALK datasheet(95/157 Pages) TI

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6.12.9 TX Typical Characteristics at 1.8GHz

Typical values at TA = +25°C with nominal supplies. Unless otherwise noted, TX input data rate = 491.52MSPS, fDAC =

11796.48MSPS, interleave mode, AOUT = –1 dBFS, 1st Nyquist zone output, Internal PLL, fREF = 491.52MSPS, 24x

Interpolation, DSA = 0 dB, Sin(x)/x enabled, Dither = 1, DSA calibrated, TX Clock Dither Enabled

Output Frequency (MHz)

1200 1350 1500 1650 1800 1950 2100 2250 2400 2550 2700

-160

-158

-156

-154

-152

-150

-148

-146

Aout=-30dBFS

Aout=-20dBFS

Aout=-12dBFS

Aout=-6dBFS

Aout=-1dBFS

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

interleave mode, 40-MHz offset

Figure 6-333. TX Single Tone Output Noise vs Frequency and

Amplitude at 1.8 GHz

TM1.1, POUT_RMS = –13 dBFS

Figure 6-334. TX 20-MHz LTE Output Spectrum at 1.8425 GHz

Pout (dBFS)

-32

-30

-28

-26

-24

-22

-20

-18

-16

-14

-12

-72

-70

-68

-66

-64

-62

-60

-58

-56

-54

1TX

2TX

3TX

4TX

Matching at 1.8 GHz, single carrier 20-MHz BW TM1.1 LTE

Figure 6-335. TX 20-MHz LTE ACPR vs Digital Level at 1.8425

GHz

Pout(dBFS)

-32

-30

-28

-26

-24

-22

-20

-18

-16

-14

-12

-73

-71

-69

-67

-65

-63

-61

-59

-57

-55

1TX

2TX

3TX

4TX

Matching at 1.8 GHz, single carrier 20-MHz BW TM1.1 LTE

Figure 6-336. TX 20-MHz LTE alt-ACPR vs Digital Level at 1.8425

GHz

Pout(dBFS)

-32

-30

-28

-26

-24

-22

-20

-18

-16

-14

-12

-74

-72

-70

-68

-66

-64

-62

-60

-58

-56

-54

1TX

2TX

3TX

4TX

Matching at 1.8 GHz, single carrier 20-MHz BW TM1.1 LTE

Figure 6-337. TX 20-MHz LTE alt2-ACPR vs Digital Level at

1.8425 GHz

DSA (dB)

-72

-69

-66

-63

-60

-57

-54

-51

1TX

2TX

3TX

4TX

Matching at 1.8 GHz, single carrier 20-MHz BW TM1.1 LTE

Figure 6-338. TX 20-MHz LTE ACPR vs DSA at 2.6 GHz

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AFE7900

SBASA44A – AUGUST 2021 – REVISED MARCH 2022

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