AFE7900 datasheet(69/157 Pages) TI

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6.12.7 TX Typical Characteristics at 30MHz and 400MHz

Typical values at TA = +25°C with nominal supplies. Default conditions: TX input data rate = 125 MSPS, fDAC = 6000

MSPS (48x interpolation), interleave mode, 1st Nyquist zone output, PLL clock mode with fREF = 500 MHz. Additional default

conditions for all plots, AOUT = –1 dBFS, DSA = 0 dB, Sin(x)/x enabled, Dither = 1, DSA calibrated, TX Clock Dither Enabled

Output Frequency (MHz)

100

200

300

400

500

600

4.2

4.4

4.6

4.8

5.2

5.4

5.6

5.8

6.2

6.4

6.6

6.8

0TXOUT

1TXOUT

2TXOUT

3TXOUT

including PCB and cable losses

Figure 6-202. TX Output Fullscale vs Output Frequency: 5 MHz -

600 MHz

Temperature (C)

-40

-20

100

120

5.5

6.5

7.5

8.5

9.5

0TXOUT

1TXOUT

2TXOUT

3TXOUT

including PCB and cable losses

Figure 6-203. TX Output Fullscale vs Temperature at 30 MHz

DSA Setting (dB)

-40

-35

-30

-25

-20

-15

-10

-5

0TXOUT

1TXOUT

2TXOUT

3TXOUT

including PCB and cable losses

Figure 6-204. TX Output Fullscale vs DSA Setting at 30 MHz

DSA Setting (dB)

-0.1

-0.08

-0.06

-0.04

-0.02

0.02

0.04

0.06

0.08

0.1

Temp = -40C

Temp = -25C

Temp = 105C

Differential Gain Error = POUT(DSA Setting – 1) – POUT(DSA

Setting) + 1

Figure 6-205. Uncalibrated TX Differential Gain Error (DNL) at 30

MHz

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AFE7900

SBASA44A – AUGUST 2021 – REVISED MARCH 2022

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