Tr i p ath Technol ogy, I n c. - Techni cal I n for m ati on

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TC2000 – KLI/1.1/12-03

For the best signal-to-noise ratio and lowest distortion, the maximum differential modulator feedback

voltage should be approximately 4Vpp. This will keep the gain of the modulator as low as possible

and still allow headroom so that the feedback signal does not clip the modulator feedback stage.

The modulator feedback resistors are:

FBB

FBB

CC

FBC

R

2V

R

V

R

−













∗

=

Mute Control

When a logic high signal is supplied to MUTE, both amplifier channels are muted (both high- and low-

side transistors are turned off). When a logic level low is supplied to MUTE, both amplifiers are fully

operational.

Ou tp u t Vo ltag e Offset

The TC2000 does not have internal compensation for DC offset. If offset is a consideration for the

intended application, trimming of the input offset voltage will be required. Tripath has had success

with both active and passive circuits for this purpose; please consult with the Tripath Applications

team for further information.

HMUTE

The HMUTE pin is a 5V logic output that indicates various fault conditions within the device.

OVRLDB

The OVRLDB pin is a 5V logic output that is asserted just at the onset of clipping. When low, it

indicates that the level of the input signal has overloaded the amplifier resulting in increased distortion

at the output. The OVRLDB signal can be used to control a distortion indicator light or LED through a

simple buffer circuit, as the OVRLDB cannot drive an LED directly. There is a 20K resistor on chip in

series with the OVRLDB output.