AFE4490 datasheet(10/85 Pages) TI2

10 / 85 page

Frequency (Hz)

3 4 5 67 10

20 30 50 70100

200

500 1000

-20

-16

-12

-8

-4

5% Duty Cycle

25% Duty Cycle

Frequency (Hz)

100

200

300

400

500

600

700

800

900 1000

-50

-40

-30

-20

-10

PRF = 50 Hz

PRF = 100 Hz

PRF = 200 Hz

PRF = 400 Hz

PRF = 800 Hz

PRF = 1000 Hz

Duty Cycle (%)

100

140

180

220

D022

Decimation Factor = 1

Decimation Factor = 2

Decimation Factor = 4

Decimation Factor = 8

Decimation Factor = 16

Duty Cycle (%)

100

200

300

400

500

I_OFFDAC = 0 PA, Rf = 25 k:

I_OFFDAC = 7 PA, Rf = 1000 k:

I_OFFDAC = 7 PA, Rf = 250 k:

Duty Cycle (%)

ADC Averaging = 1

ADC Averaging = 2

ADC Averaging = 4

ADC Averaging = 8

ADC Averaging = 16

Duty Cycle (%)

100

102

ADC Averaging = 1

ADC Averaging = 2

ADC Averaging = 4

ADC Averaging = 8

ADC Averaging = 16

AFE4404

SBAS689D – JUNE 2015 – REVISED DECEMBER 2016

www.ti.com

Product Folder Links: AFE4404

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Typical Characteristics (continued)

At 25°C, TX_SUP = 4 V, RX_SUP = IO_SUP = 3.3 V, 100-Hz PRF, 25% duty cycle, Rf = 500 kΩ, Cf is adjusted to keep the

TIA time constant at 1/10th of the sampling duration, 8-MHz external clock (with CLKDIV_EXTMODE set to divide-by-2),

CLKDIV_PRF = 1, detector CIN = 50 pF, ADC averaging = max allowed, SNR (dBFS) = noise referred to full-scale range of

2 V, noise integrated from 1 Hz to Nyquist (= PRF / 2), and values assigned to CLKDIV_EXTMODE and CLK_DIV_PRF

parameters correspond to division ratios controlled by these modes, unless otherwise specified.

Figure 7. Receiver Input-Referred Noise Current over

Nyquist Bandwidth vs Duty Cycle (Different ADC Averaging)

Figure 8. Receiver Signal-to-Noise Ratio over Nyquist

Bandwidth vs Duty Cycle (Different ADC Averaging)

Figure 9. Input-Referred Noise Current in Nyquist

Bandwidth vs Duty Cycle (Different Decimation Factor)

Figure 10. Receiver Input-Referred Noise in 20-Hz

Bandwidth vs Duty Cycle

(Different Offset Cancellation DAC Currents)

PRF = 2000 Hz

Figure 11. Response of the Switched-RC Filter

at the AFE Output

Figure 12. Filter Response for Multiple PRFs at

1% Duty Cycle

AFE4490 Datasheet(PDF) 10 Page - Texas Instruments

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