RB-TA3020 Ver la hoja de datos (PDF) - Tripath Technology Inc.

Número de pieza

componentes Descripción

Fabricante

RB-TA3020

CLASS-T DIGITAL AUDIO AMPLIFIER REFERENCE BOARD USING DIGITALPOWER PROCESSING (DPP™) TECHNOLOGY

Tripath Technology Inc. 

Tripath Technology, Inc. - Technical Information

ARCHITECTURE

A block diagram of one channel of the reference board is shown in Figure 4. The major functional blocks

of the amplifier are described below.

In

Input Stage

TA3020

Output

Out

Section

Figure 4

Note: The TA3020 is an inverting amplifier.

TA3020 Amplifier Gain

The TA3020 amplifier gain is the product of the input stage gain and the modulator gain.

AVTA3020 = AVINPUTSTAGE * AVMODULATOR

A VTA3020

≈

−

RF

RI

×

 RFBC ∗ (RFBA+RFBB)

 RFBA ∗ RFBB

+

1

For the RB-TA3020-2 board;

RI (R100, R200) = 49.9kΩ

RF (R101, R201) = 20kΩ

RFBA (R105, R205) = 1kΩ

RFBB (R110, R210) = 1.07kΩ

RFBC (R106, R206) = 13.3kΩ

AVTA3020 ≈

−

20kΩ

49.9k Ω

×  13.3kΩ ∗ (1kΩ+1.07kΩ)

 1kΩ ∗ 1.07kΩ

+ 1

= 10.71V

V

Input Stage

Figure 5 shows one channel of the Input Stage. The TA3020 amplifier is designed to accept unbalanced

inputs. For the RB-TA3020-1, the gain is 6.4, or approximately 16 dB. For the RB-TA3020-2, the gain is

10.8, or approximately 20.7 dB. Please note that the input stage of the TA3020 is biased at

approximately 2.5VDC. Therefore, for an input signal centered around ground (0VDC), the polarity of the

coupling capacitor, CIN, shown in Figure 5 is correct.

5

RB-TA3020, Rev. 3.0/03.02

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