AFE030 datasheet(29/58 Pages) TI1

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From Line-Coupling

Circuit

IN,PGA2

C =

Rx C1

Rx C2

330 W

To ADC

Input on MCU

LPF

PGA

See Note 2

Inside the AFE030

Rx_PGA1_OUT

Rx_F_IN

Rx_PGA1_

Rx_PGA2_OUT

Rx_F_

OUT

PA_IN

IN,PGA1

C =

See Note 1

Rx_C1

Rx_C2

See Note 3

AFE030

www.ti.com

SBOS588A

– DECEMBER 2011 – REVISED DECEMBER 2011

The Rx PGA1, Rx Filter, and Rx PGA2 components have all inputs and outputs externally available to provide

maximum system design flexibility. Care should be taken when laying out the PCB traces from the inputs or

outputs to avoid excessive capacitive loading. Keeping the PCB capacitance from the inputs to ground, or

outputs to ground, below 100 pF is recommended.

Figure 34 shows the complete Rx signal path, including the optional passive passband filter.

(1) For capacitor value C1,f is the desired lower cutoff frequency and RIN,PGA1 is the input resistance of Rx PGA1.

(2) For capacitor value C2,f is the desired lower cutoff frequency and RIN,PGA2 is the input resistance of Rx PGA2.

(3) Refer to Table 3.

Figure 34. Complete Rx Signal Path (with Optional Bandpass Filter)

DAC Block

The DAC block consists only of the 10-bit DAC. The use of the DAC is recommended for best performance. The

serial interface is used to write directly to the DAC registers when the DAC pin (pin 7) is driven high. Placing the

DAC pin into a high state configures the SPI for direct serial interface to the DAC. Use the following sequence to

write to the DAC:

•

Set CS low.

•

Set the DAC pin (pin 7) high.

•

Write a 10-bit word to DIN. The DAC register is left-justified and truncates more than 10 bits.

•

CS high updates the DAC.

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