COMBOSOLAR datasheet(24/57 Pages) TI1

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LPF

MCU

PGA

f 22 k

· · ·

C =

Note (3)

Tx_F_OUT

Tx_PGA_

Tx_F_IN1

PA_OUT1

PA_OUT2

Tx_PGA_

OUT

Tx_F_IN2

PA_IN

GPIO

Note (1)

Inside the AFE031

510 W

Note (2)

LPF

MCU

PGA

f 22 k

· · ·

C =

Note (2)

Inside the AFE031

Tx_F_OUT

Tx_PGA_

Tx_F_IN1

PA_OUT1

PA_OUT2

Tx_PGA_

OUT

Tx_F_IN2

PA_IN

GPIO

Note (1)

43 kW

AFE031

SBOS531D – AUGUST 2010 – REVISED MAY 2012

www.ti.com

(1)

When using both Tx Filter inputs, use 43-k

Ω resistors to match the input resistance for best frequency response.

(2)

For capacitor value C, f is the desired lower cutoff frequency and 22 k

Ω is the PA input resistance.

Figure 29. Recommended Tx Signal Chain Connections in PWM Mode Using Two PWM Signals

In PWM mode, there is inherently more distortion from the PWM signal than from the internal DAC. To achieve

the best results in PWM mode, add passive RC filters to increase the low-pass filtering. Figure 30 and Figure 31

illustrate the recommended locations of these RC filters.

(1)

Leave unused Tx Filter input unconnected.

(2)

Refer to Table 2.

(3)

For capacitor value C, f is the desired lower cutoff frequency and 22 k

Ω is the PA input resistance.

Figure 30. Recommended Tx Signal Chain Connections in PWM Mode

Using One PWM Signal and Additional RC Filters

Product Folder Link(s): AFE031

COMBOSOLAR 数据表(PDF) 24 Page - Texas Instruments

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COMBOSOLAR 数据表(PDF) 24 Page - Texas Instruments

COMBOSOLAR 数据表(HTML) 24 Page - Texas Instruments

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