Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on
Input Connections
Audio input to the board is located at CH1 INPUT (J100) and CH2 INPUT (J200) (see Figures 2 and 3).
The input can be a test signal or music source. A dual RCA cable is provided with female 100mil
connectors that mate with J100 and J200.
Output Connections
There are two output connectors on the reference board for the speaker outputs. Channel 1 output and
associated Power Ground 1 is located at J101. Channel 2 output and associated Power Ground 2 is
located at J201. A two-wire harness for each output is provided. See Table 2 for the output connector
wire colors. The TA3020 can be operated as a two-channel single-ended amplifier, bridged mono output
amplifier (see Figure 9) or with a passive crossover for a 2.1 channel application (refer to Application Note
13). Outputs can be any passive speaker(s) or test measurement equipment with resistive load (see
Application Note 4 for more information on bench testing).
Connector Name
J101
J201
Output
White
Red
Table 2
Ground
Blue
Black
Turn-on/off Pop
To avoid turn-on pops, bring the mute from a high to a low state after all power supplies have settled. To
avoid turn-off pops, bring the mute from a low to a high state before turning off the supplies. The only
issue with bringing up the V5 last, or turning it off first, is clicks/pops. If the mute line is properly toggled
(slow turn-on, quick turn-off), then any power up sequence is acceptable. In practice, the V5 will usually
collapse before VPP and VNN. The same discussion holds true for the VN10 supply. It can collapse
before VPP or VNN though this may cause a larger turn-off pop than if the mute had been activated
before either the VN10 or V5 supply have collapsed. No damage will occur to the TA3020 if either the V5
or VN10 collapse before VPP or VNN, assuming the mute is asserted before the supplies start to
discharge.
HMUTE
There is an LED, D1, which will illuminate if a fault condition is reported. HMUTE, pin 15, will illuminate
D1 via R2, if the processor detects an over or under voltage fault, as well as an over current fault. In
addition, if MUTE is high (by removing jumper on J4), the LED will also be illuminated.
An over/under voltage fault will automatically reset (and D1 will turn off) once the supply voltage is
brought back into specification. If an over current condition occurs, cycle the MUTE pin (by removing the
jumper on J4 and then replacing it). Assuming all supplies are still within specification, the HMUTE LED
will be off and the TA3020 reference board will again amplify input signals.
3
RB-TA3020, Rev. 3.0/03.02
TRIPATH [ TRIPATH TECHNOLOGY INC. ]
