AFE7903 datasheet(42/152 Pages) TI

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6.11.2 RX Typical Characteristics at 800 MHz (continued)

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

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

DSA (dB)

-0.04

-0.02

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

1RX

3RX

With 0.8 GHz matching

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

Setting = 0) + (DSA Setting)

Figure 6-56. RX Calibrated Integrated Amplitude Error vs DSA

Setting at 2.6 GHz

DSA (dB)

-0.4

-0.2

0.2

0.4

0.6

1RX

3RX

With 0.8 GHz matching

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

PhaseIN(DSA Setting)

Figure 6-57. RX Uncalibrated Differential Phase Error vs DSA

Setting at 0.8 GHz

DSA (dB)

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

0.6

1RX

3RX

With 0.8 GHz matching

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

PhaseIN(DSA Setting)

Figure 6-58. RX Calibrated Differential Phase Error vs DSA

Setting at 0.8 GHz

DSA (dB)

-1.2

-0.9

-0.6

-0.3

0.3

0.6

0.9

1.2

1RX

3RX

With 0.8 GHz matching

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

Setting = 0)

Figure 6-59. RX Uncalibrated Integrated Phase Error vs DSA

Setting at 0.8 GHz

DSA (dB)

-0.6

-0.4

-0.2

0.2

0.4

0.6

1RX

3RX

With 0.8 GHz matching

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

Setting = 0)

Figure 6-60. RX Calibrated Integrated Phase Error vs DSA

Setting at 0.8 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 = 63.2dBFS

With 0.8 GHz matching, fIN = 840 MHz, AIN= –3 dBFS

Figure 6-61. RX Output FFT at 0.8 GHz

AFE7903

SBASAK2 – MARCH 2022

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