AFE4490 datasheet(13/69 Pages) TI

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Pleth Current ( A)

Duty cycle 1%

Duty cycle 5%

Duty cycle 10%

Duty cycle 15%

Duty cycle 20%

Duty cycle 25%

C011

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.)

RMS noise is calculated in 5Hz B/W & NFB is calculated using 6.6 u RMS noise.

Pleth Current ( A)

Duty cycle 1%

Duty cycle 5%

Duty cycle 10%

Duty cycle 15%

Duty cycle 20%

Duty cycle 25%

C012

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).

RMS noise is calculated in 5Hz B/W & NFB is calculated using 6.6 u RMS noise.

200

400

600

800

1000

1200

1400

Pleth Current ( A)

Duty cycle 1%

Duty cycle 5%

Duty cycle 10%

Duty cycle 15%

Duty cycle 20%

Duty cycle 25%

C009

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.

Pleth Current ( A)

Duty cycle 1%

Duty cycle 5%

Duty cycle 10%

Duty cycle 15%

Duty cycle 20%

Duty cycle 25%

C010

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).

RMS noise is calculated in 5Hz B/W & NFB is calculated using 6.6 u RMS noise.

100

200

300

400

500

600

700

800

Pleth Current ( A)

Duty Cycle = 1%

Duty Cycle = 5%

Duty Cycle = 10%

Duty Cycle = 15%

Duty Cycle = 20%

Duty Cycle = 25%

C007

For each 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.

200

400

600

800

1000

1200

Pleth Current ( A)

Duty cycle 1%

Duty cycle 5%

Duty cycle 10%

Duty cycle 15%

Duty cycle 20%

Duty cycle 25%

C008

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.

AFE4400

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SBAS601D – DECEMBER 2012 – REVISED MAY 2013

TYPICAL CHARACTERISTICS (continued)

At TA = +25°C, RX_ANA_SUP = RX_DIG_SUP = 3.0 V, TX_CTRL_SUP = LED_DRV_SUP = 3.3 V, and fCLK = 8 MHz, unless

otherwise noted.

Figure 9. INPUT-REFERRED NOISE CURRENT vs

Figure 10. INPUT-REFERRED NOISE CURRENT vs

PLETH CURRENT (PRF = 1200 Hz)

PLETH CURRENT (PRF = 2500 Hz)

Figure 11. INPUT-REFERRED NOISE CURRENT vs

Figure 12. NOISE-FREE BITS vs PLETH CURRENT

PLETH CURRENT (PRF = 5000 Hz)

(PRF = 100 Hz)

Figure 13. NOISE-FREE BITS vs PLETH CURRENT

Figure 14. NOISE-FREE BITS vs PLETH CURRENT

(PRF = 300 Hz)

(PRF = 600 Hz)

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