AFE7900 datasheet(42/157 Pages) TI

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6.12.2 RX Typical Characteristics at 800MHz

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.

Output Frequency (MHz)

700

800

900

1000

1100

-1

-0.8

-0.6

-0.4

-0.2

0.2

0.4

DSA=4dB

DSA=6dB

DSA=8dB

DSA=10dB

DSA=12dB

DSA=14dB

With 0.8 GHz matching, normalized to 830 MHz

Figure 6-50. RX In-Band Gain Flatness for Channel 1RX, fIN =

830 MHz

Temperature (qC)

-40

-30

-20

-10

-0.2

-0.17

-0.14

-0.11

-0.08

-0.05

-0.02

0.01

0.04

0.07

0.1

0.13

1RX

2RX

3RX

4RX

With 0.8 GHz matching, normalized to fullscale at 25°C for

each channel

Figure 6-51. RX Input Fullscale vs Temperature and Channel at

800MHz

Temperature (qC)

-40

-30

-20

-10

-4

-3

-2

-1

1RX

2RX

3RX

4RX

With 0.8 GHz matching, normalized to phase at 25°C

Figure 6-52. RX Input Phase vs Temperature and DSA at fOUT =

0.8 GHz

DSA (dB)

-0.1

-0.05

0.05

0.1

0.15

0.2

0.25

0.3

1RX

2RX

3RX

4RX

With 0.8 GHz matching

Differential Amplitude Error = PIN(DSA Setting – 1) – PIN(DSA

Setting) + 1

Figure 6-53. RX Uncalibrated Differential Amplitude Error vs

DSA Setting at 0.8 GHz

DSA (dB)

-0.025

-0.02

-0.015

-0.01

-0.005

0.005

0.01

0.015

0.02

0.025

0.03

1RX

2RX

3RX

4RX

With 0.8 GHz matching

Differential Amplitude Error = PIN(DSA Setting – 1) – PIN(DSA

Setting) + 1

Figure 6-54. RX Calibrated Differential Amplitude Error vs DSA

Setting at 0.8 GHz

DSA (dB)

0.3

0.6

0.9

1.2

1.5

1.8

2.1

2.4

2.7

1RX

2RX

3RX

4RX

With 0.8 GHz matching

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

Setting = 0) + (DSA Setting)

Figure 6-55. RX Uncalibrated Integrated Amplitude Error vs

DSA Setting at 0.8 GHz

AFE7900

SBASA44A – AUGUST 2021 – REVISED MARCH 2022

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