RB-TA3020-2 Ver la hoja de datos (PDF) - Tripath Technology Inc.

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RB-TA3020-2

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

Tripath Technology Inc. 

Tripath Technology, Inc. - Technical Information

49.9K Ω

R IN

V5

2.2uF, 50V

+

C IN

10K Ω

1M Ω

1M Ω

0.1uF, 50V

Input to TA3020

(DC Bias ~2.5V)

Figure 5

The value of the input capacitor, CIN, in Figure 5 (labeled C100 and C200 on the schematic), and the input

resistor, RIN (labeled R100 and R200), set the –3dB point of the input high-pass filter. The frequency of

the input high pass pole, FP, –3dB point can be calculated as follows:

FP = 1/(2π x CIN x RIN )

where: CIN = input capacitor value in Farads

RIN = input resistor value in Ohms

Output offset voltages can be nulled by adjusting the 10KΩ potentiometer shown in Figure 5. Once set,

the offset does not typically drift with temperature, so no tracking circuitry is required. Offsets can

typically be set to +/- 25 mV. R104 is used to adjust the offset of CH1, and R204 is used to adjust the

offset of CH2. If a different TA3020 is placed in the RB-TA3020 reference board, the offset of each

channel will need to be re-trimmed.

RB-TA3020 Control Circuitry

The MUTE pin is brought out to an external 2-pin header, J4 (Figure 6). When a jumper is installed from

Pin 1 to 2 of J4, the MUTE line is pulled to ground and the outputs are enabled. Note that if the MUTE

jumper is removed, the MUTE pin floats high, and the amplifier is muted.

MUTE 24

J4

AGND

OCR2

ROCR

R111

33

31

OCR1

C103

R211

C203

Figure 6

+5V

BBM0 22

J2

23

BBM1

+5V

J3

6

RB-TA3020, Rev. 3.0/03.02

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