AFE7900IALK datasheet(32/157 Pages) TI

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6.12 Typical Characteristics

6.12.1 RX Typical Characteristics 30 MHz and 400 MHz

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.

Input Frequency (MHz)

-3

-2.5

-2

-1.5

-1

-0.5

0.5

DSA = 0dB

DSA = 4dB

DSA = 8dB

DSA = 12dB

DSA = 16dB

DSA = 20dB

DSA = 24dB

Normalized to 30 MHz

Figure 6-1. RX In-Band Gain Flatness, fIN = 30 MHz

DSA Setting (dB)

-0.5

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

Temp = -40C

Temp = 25C

Temp = 110C

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

Setting) + 1

Figure 6-2. RX Uncalibrated Differential Amplitude Error vs DSA

Setting at 30 MHz

DSA Setting (dB)

-0.05

-0.04

-0.03

-0.02

-0.01

0.01

0.02

0.03

0.04

0.05

Temp = -40C

Temp = 25C

Temp = 110C

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

Setting) + 1

Figure 6-3. RX Calibrated Differential Amplitude Error vs DSA

Setting at 30 MHz

DSA Setting (dB)

-1

-0.5

0.5

1.5

2.5

3.5

Temp = -40C

Temp = 25C

Temp = 110C

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

Setting = 0) + (DSA Setting)

Figure 6-4. RX Uncalibrated Integrated Amplitude Error 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 = 110C

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

Setting = 0) + (DSA Setting)

Figure 6-5. RX Calibrated Integrated Amplitude 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

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

PhaseIN(DSA Setting)

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

Setting at 30 MHz

AFE7900

SBASA44A – AUGUST 2021 – REVISED MARCH 2022

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