AFE7900IALK datasheet(49/157 Pages) TI

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6.12.3 RX Typical Characteristics 1.75GHz to 1.9GHz (continued)

Typical values at TA = +25°C, ADC Sampling Rate = 2949.12 GHz. Default conditions: output sample rate = 491.52MSPS

(decimate by 6), PLL clock mode with fREF = 491.52MHz, AIN = –3 dBFS, DSA setting = 4 dB.

DSA (dB)

-0.008

-0.006

-0.004

-0.002

0.002

0.004

0.006

0.008

0.01

0.012

0.014

0.016

1RX

2RX

3RX

4RX

With 1.8 GHz matching

Integrated Amplitude Error = PIN(DSA Setting) – PIN(DSA

Setting = 0) + (DSA Setting)

Figure 6-87. RX Calibrated Integrated Amplitude Error vs DSA

Setting at 1.75 GHz

DSA (dB)

-2

-1.5

-1

-0.5

0.5

1RX

2RX

3RX

4RX

With 1.8 GHz matching

Differential Phase Error = PhaseIN(DSA Setting – 1) –

PhaseIN(DSA Setting)

Figure 6-88. RX Uncalibrated Differential Phase Error vs DSA

Setting at 1.75 GHz

DSA (dB)

-1

-0.7

-0.4

-0.1

0.2

0.5

1RX

2RX

3RX

4RX

With 1.8 GHz matching

Differential Phase Error = PhaseIN(DSA Setting – 1) –

PhaseIN(DSA Setting)

Figure 6-89. RX Calibrated Differential Phase Error vs DSA

Setting at 1.75 GHz

DSA (dB)

-11

-10

-9

-8

-7

-6

-5

-4

-3

-2

-1

1RX

2RX

3RX

4RX

With 1.8 GHz matching

Integrated Phase Error = Phase(DSA Setting) – Phase(DSA

Setting = 0)

Figure 6-90. RX Uncalibrated Integrated Phase Error vs DSA

Setting at 1.75 GHz

DSA (dB)

-1.5

-1

-0.5

0.5

1RX

2RX

3RX

4RX

With 1.8 GHz matching

Integrated Phase Error = Phase(DSA Setting) – Phase(DSA

Setting = 0)

Figure 6-91. RX Calibrated Integrated Phase Error vs DSA

Setting at 1.75 GHz

Output Frequency (MHz)

-250 -200 -150 -100

-50

100

150

200

250

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

SNR = 60.9dBFS

With 1.8 GHz matching, fIN = 2610 MHz, AIN= –3 dBFS

Figure 6-92. RX Output FFT at 1.75 GHz

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AFE7900

SBASA44A – AUGUST 2021 – REVISED MARCH 2022

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