AFE4403 datasheet(18/97 Pages) TI

18 / 97 page

100

150

200

250

300

DAC Current Setting Code

Actual current

Expected current - 2 %

Expected current + 2 %

C024

LED Current (mA)

C031

100

104

108

112

116

Duty Cycle (%)

TX_REF = 0.25 V

TX_REF = 0.5 V

TX_REF = 0.75 V

TX_REF = 1 V

C027

Duty Cycle (%)

TX_REF = 0.25 V

TX_REF = 0.5 V

TX_REF = 0.75 V

TX_REF = 1 V

C028

Internal Clock Frequency (MHz)

C029

±20

100

150

200

250

300

DAC Current Setting Code

C025

AFE4403

SBAS650B – MAY 2014 – REVISED JULY 2014

www.ti.com

Typical Characteristics (continued)

At PRF = 100 Hz, 25% duty cycle, RF = 500 kΩ, CF is adjusted to keep TIA time constant at 1/10th of sampling duration, All

supplies at 3.3 V, 8-MHz external clock, CLKOUT tri-state, 1-µF capacitor on TX_REF and BG pins, detector CIN = 50 pF,

TX_REF = 0.5 V, ADC averaging = max allowed, and SNR in dBFS is noise referred to full-scale range of 2 V, unless

otherwise noted.

RF = 250 kΩ

PRF = 100 Hz

ADC averaging = 1

TX_REF = 0.25 V

Figure 29. Receiver Input-Referred Noise Current vs

Figure 30. Transmitter DAC Current Step Error

Internal Clock Frequency

PRF = 500 Hz

DAC current is set such that ADC output is 50 %FS

Figure 31. SNR in 20-Hz BW vs Duty Cycle

Figure 32. Input Referred Noise Current in 20-Hz BW vs

Duty Cycle (TX_REF Voltage with Tx-Rx Loopback)

(TX_REF Voltage with Tx-Rx Loopback)

TX_REF = 0.25 V

LED current = 48 mA

100 devices on tester

Figure 33. Transmitter Current linearity

Figure 34. Transmitter Current Across Devices

Submit Documentation Feedback

Product Folder Links: AFE4403

AFE4403 Datasheet(PDF) 18 Page - Texas Instruments

AFE4403 Datasheet(HTML) 18 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97

Datasheet Download

Link URL