AFE4403 datasheet(72/97 Pages) TI

72 / 97 page

AFE4403

SBAS650B – MAY 2014 – REVISED JULY 2014

www.ti.com

Figure 106. TIAGAIN: Transimpedance Amplifier Gain Setting Register

(Address = 20h, Reset Value = 0000h)

ENSEP

STAGE2

GAIN

EN1

STG2GAIN1[2:0]

CF_LED1[4:0]

RF_LED1[2:0]

This register sets the device transimpedance amplifier gain mode and feedback resistor and capacitor values.

Bits 23:16

Must be 0

Bit 15

ENSEPGAIN: Enable separate gain mode

0 = The RF, CF values and stage 2 gain settings are the same for both the LED2 and LED1

signals; the values are specified by the bits (RF_LED2, CF_LED2, STAGE2EN2,

STG2GAIN2) in the TIA_AMB_GAIN register (default after reset)

1 = The RF, CF values and stage 2 gain settings can be independently set for the LED2 and

LED1 signals. The values for LED1 are specified using the bits (RF_LED1, CF_LED1,

STAGE2EN1, STG2GAIN1) in the TIAGAIN register, whereas the values for LED2 are

specified using the corresponding bits in the TIA_AMB_GAIN register.

Bit 14

STAGE2EN1: Enable stage 2 for LED 1

0 = Stage 2 is bypassed (default after reset)

1 = Stage 2 is enabled with the gain value specified by the STG2GAIN1[2:0] bits

Bits 13:11

Must be 0

Bits 10:8

STG2GAIN1[2:0]: Program stage 2 gain for LED1

000 = 0 dB, or linear gain of 1 (default after

100 = 12 dB, or linear gain of 4

reset)

101 = Do not use

001 = 3.5 dB, or linear gain of 1.5

110 = Do not use

010 = 6 dB, or linear gain of 2

111 = Do not use

011 = 9.5 dB, or linear gain of 3

Bits 7:3

CF_LED1[4:0]: Program CF for LED1

00000 = 5 pF (default after reset)

00100 = 25 pF + 5 pF

00001 = 5 pF + 5 pF

01000 = 50 pF + 5 pF

00010 = 15 pF + 5 pF

10000 = 150 pF + 5 pF

Note that any combination of these CF settings is also supported by setting multiple bits to 1.

For example, to obtain CF = 100 pF, set bits 7:3 = 01111.

Bits 2:0

RF_LED1[2:0]: Program RF for LED1

000 = 500 k

Ω (default after reset)

100 = 25 k

001 = 250 k

101 = 10 k

010 = 100 k

110 = 1 M

011 = 50 k

111 = None

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