MLZ2012A3R3W datasheet(35/68 Pages) TI1

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To PGAP

VINN

VINP

From

LOFFP

TESTP

TEMPM

ADS1299 Mux

Mux[2:0] = 001

0.75 x VDD

Mux[2:0] =011

Mux[2:0] =100

0.25 x VDD

Mux[2:0] =101

TESTM

Mux[2:0] =101

Mux[2:0] =110

Mux[2:0] =111

Mux[2:0] = 001

To PGAN

Mux[2:0] =010 AND

BIAS_MEAS

From

LOFFM

Mux[2:0] =011

Mux[2:0] =100

TEMPP

INT_TEST

(VREFP+VREFN)

Mux[2:0] = 010

AND BIAS_MEAS

To Next Chans

INT_TEST

CHxSET[3] =1

MAIN AND SRB1

To Next Chans

MAIN AND SRB1

MAIN

BIASREF_INT=0

(AVDD+AVSS)

BIASREF_INT=1

TEST

NOTE:

MAIN = Mux[2:0] =000 OR Mux[2:0] = 111OR

Mux[2:0] = 110

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EEG Specific Features

The reference voltage for the on-chip right leg drive can be driven externally. The on-chip voltage is set to

mid-supply. If the application requires the common mode to be set to any other voltage, this configuration

can be accomplished by setting the appropriate bit in the Configuration 3 Register. The external BIASREF

voltage is set by resistor R1 and adjustable resistor R2.

The following procedure needs to be applied to activate the Bias drive circuitry:

Step 1.

Set the inputs to Normal Electrode, refer Figure 38

Figure 38. Settings for Normal Electrode

Step 2.

Turn on the bias drive buffer and set the internal bias drive reference; refer to Figure 39.

Figure 39. Configuring BIASREF and Bias Drive Buffer

Step 3.

Select the electrodes to be chosen for the bias drive loop. In this case, the channel 1 and 2

input signals are used (as Figure 40 shows).

SLAU443 – May 2012

EEG Front-End Performance Demonstration Kit

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