AFE7906 datasheet(20/78 Pages) TI

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6.11.1 RX Typical Characteristics 30 MHz and 400 MHz (continued)

Typical values at TA = +25°C. Default conditions at 30MHz: ADC Sampling Rate = 1500 MSPS, output sample rate = 62.5

MSPS (decimate by 24x), PLL clock mode with fREF = 500 MHz, AIN = –3 dBFS, DSA setting = 3 dB. Default conditions at

400 MHz: ADC Sampling Rate = 1500 MSPS, output sample rate = 125 MSPS (decimate by 12x), PLL clock mode with fREF

= 500 MHz, AIN = –3 dBFS, DSA setting = 3 dB.

DSA Setting (dB)

-1

-0.8

-0.6

-0.4

-0.2

0.2

0.4

0.6

0.8

Temp = -40C

Temp = 25C

Temp = 110C

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

PhaseIN(DSA Setting)

Figure 6-7. RX Calibrated Differential Phase Error vs DSA

Setting at 30 MHz

DSA Setting (dB)

-4

-3.5

-3

-2.5

-2

-1.5

-1

-0.5

0.5

Temp = -40C

Temp = 25C

Temp = 110C

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

Setting = 0)

Figure 6-8. RX Uncalibrated Integrated Phase Error vs DSA

Setting at 30 MHz

DSA Setting (dB)

-1

-0.8

-0.6

-0.4

-0.2

0.2

0.4

0.6

0.8

Temp = -40C

Temp = 25C

Temp = 110C

With 0.8 GHz matching

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

Setting = 0)

Figure 6-9. RX Calibrated Integrated Phase Error vs DSA

Setting at 30 MHz

AIN = -3 dBFS, fADC = 1500 MSPS, fNCO = 32.13 MHz,

Decimate by 24x

Figure 6-10. RX Output FFT at 5 MHz

AIN = -6 dBFS, fADC = 1500 MSPS, fNCO = 32. , Decimate by

24x

Figure 6-11. RX Output FFT at 5 MHz

AIN = -12 dBFS, fADC = 1500 MSPS, fNCO = 32.13 MHz,

Decimate by 24x

Figure 6-12. RX Output FFT at 5 MHz

AFE7906

SBASAF7B – JANUARY 2022 – REVISED JULY 2022

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