AFE4490 datasheet(14/70 Pages) TI

14 / 70 page

200

400

600

800

1000

1200

LED Current (mA)

C023

TX_RANGE = 150mA,

Data from 7737 devices

200

400

600

800

1000

1200

LED Current (mA)

C024

TX_RANGE = 150mA,

Data from 7737 devices

200

400

600

800

LED Current (mA)

C021

TX_RANGE = 150mA,

Data from 2326 devices

200

400

600

800

1000

1200

1400

1600

1800

2000

2200

LED Current (mA)

C022

TX_RANGE = 150mA,

Data from 7737 devices

100

120

140

160

100

150

200

250

TX LED DAC Setting

Expected + 1%

Expected ± 1%

Actual DAC Current

C019

TX Reference Voltage = 0.75V

100

120

140

160

180

200

100

150

200

250

TX LED DAC Setting

Expected + 1%

Expected ± 1%

Actual DAC Current

C020

TX Reference Voltage = 1.0V

AFE4490

SBAS602B – DECEMBER 2012 – REVISED FEBRUARY 2013

www.ti.com

TYPICAL CHARACTERISTICS (continued)

At TA = +25°C, RX_ANA_SUP = RX_DIG_SUP = 3.0 V, TX_CTRL_SUP = LED_DRV_SUP = 5 V, and fCLK = 8 MHz, unless

otherwise noted.

Figure 20. Tx CURRENT LINEARITY (150-mA Range)

Figure 21. Tx CURRENT LINEARITY (200-mA Range)

Figure 22. LED CURRENT WITH

Figure 23. LED CURRENT WITH

Tx DAC SETTING = 17 (10 mA)

Tx DAC SETTING = 60 (35 mA)

Figure 24. LED CURRENT WITH

Figure 25. LED CURRENT WITH

Tx DAC SETTING = 120 (70 mA)

Tx DAC SETTING = 255 (150 mA)

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