AFE4490 datasheet(11/70 Pages) TI

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100

200

300

400

500

600

700

Pleth Current ( A)

Duty Cycle = 1%

Duty Cycle = 5%

Duty Cycle = 10%

Duty Cycle = 15%

Duty Cycle = 20%

Duty Cycle = 25%

C005

For each setting RF adjusted for Full-Scale Output.

Amb Cancellation & stage 2 Gain = 4 used for Low

Pleth currents (0.125uA, 0.25uA & 0.5uA).

Noise is calculated in 5Hz B/W.

100

200

300

400

500

600

700

Pleth Current ( A)

Duty Cycle = 1%

Duty Cycle = 5%

Duty Cycle = 10%

Duty Cycle = 15%

Duty Cycle = 20%

Duty Cycle = 25%

C006

For each setting RF adjusted for Full-Scale Output.

Amb Cancellation & stage 2 Gain = 4 used for Low

Pleth currents (0.125uA, 0.25uA & 0.5uA.)

Noise is calculated in 5Hz band.

46.0

46.2

46.4

46.6

46.8

47.0

47.2

47.4

47.6

47.8

48.0

3.0

3.2

3.4

3.6

3.8

4.0

4.2

4.4

4.6

4.8

5.0

LED_DRV_SUP Voltage (V)

C003

With LED Current = 0mA

100

200

300

400

500

600

Pleth Current ( A)

Duty Cycle = 1%

Duty Cycle = 5%

Duty Cycle = 10%

Duty Cycle = 15%

Duty Cycle = 20%

Duty Cycle = 25%

C004

For each setting RF adjusted for Full-Scale Output.

Amb Cancellation & stage 2 Gain = 4 used for Low

Pleth currents (0.125uA, 0.25uA & 0.5uA).

Noise is calculated in 5Hz B/W

400

500

600

700

800

900

2.2

2.4

2.6

2.8

3.0

3.2

3.4

3.6

RX Supply Voltage (V)

Stage 2 & Amb Cancel Disabled

Stage 2 & Amb Cancel Enabled

C001

PRF = 600Hz

Stage 2 Gain = 4

RX_ANA_SUP = Rx_DIG_SUP

14.65

14.70

14.75

14.80

14.85

14.90

14.95

15.00

3.0

3.5

4.0

4.5

5.0

TX_CTRL_SUP Voltage (V)

C002

PRF = 600Hz

AFE4490

www.ti.com

SBAS602B – DECEMBER 2012 – REVISED FEBRUARY 2013

TYPICAL CHARACTERISTICS

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 2. TOTAL Rx CURRENT vs VOLTAGE

Figure 3. TX_CTRL_SUP CURRENT vs VOLTAGE

Figure 4. LED_DRV_SUP CURRENT vs VOLTAGE

Figure 5. INPUT-REFERRED NOISE CURRENT vs

PLETH CURRENT (PRF = 100 Hz) (1)

Figure 6. INPUT-REFERRED NOISE CURRENT vs

Figure 7. INPUT-REFERRED NOISE CURRENT vs

PLETH CURRENT (PRF = 300 Hz)

PLETH CURRENT (PRF = 600 Hz)

(1)

Data at PRF = 625 Hz, 5% duty cycle.

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