1 Features

• AEC-Q100 qualified for automotive applications

– Temperature grade 1: –40°C to +125°C, TA

• General operation

– 4.5V to 45V supply voltage, 50V load dump

– Support for 1.8V and 3.3V I/O’s

– I2C control with 8 address options

– <2-W idle power loss at 14.4V, <8uA max

VBAT+PVDD shutdown loss

• Integrated DSP processing

– Class-H supply voltage control

– Thermal monitoring and foldback

– Clip detection, PVDD monitoring and foldback

• Output current sensing by channel via I2S/TDM

– No need for external circuitry

• Real-time load diagnostics

– Monitor output conditions while playing audio

– Real-time temperature monitor for each

channel

– Open load, Shorted load, Short-to-power,

Short-to-ground detection

• DC and AC Standby load diagnostics

• Audio inputs

– 2-4 channel I2S or 4-16 channel TDM input

– Input sample rates: 44.1, 48, 96, 192kHz

– Low latency support < 100us at 96k sample

rate

• Audio outputs

– 4-channel bridge-tied load (BTL), configurable

2-channel parallel BTL (PBTL)

– 384kHz to 2MHz configurable output switching

frequency

– Up to 13A channel output current

– 400VA peak BTL output power

– 118W (45V, 8Ω, 1% THD, BTL)

– 215W (45V, 4Ω, 1% THD, BTL)

• Audio Performance

– THD+N 0.03% (8Ω, 1W, 1kHz)

– 111dB SNR

– 37μV (14.4V), 80μV (45V) output noise

• Protection

– Output short protection

– DC offset, undervoltage and overvoltage

– Configurable overtemperature warning and

individual channel shutdown

– I2C temperature and supply voltage readout

• Easily meet CISPR25-L5 EMC specification

– Advanced spread-spectrum

2 Applications

• Automotive external amplifier

• Automotive head unit

3 Description

The TAS6684-Q1 is a four-channel, digital-input, highvoltage,

Class-D audio amplifier that supports up

to 45V supply voltage. When combined with up to

13A output current, this device delivers maximum

output power and high fidelity audio in high and low

impedance loads. The device provides four channels

at 118W (45V, 8Ω, 1% THD, BTL) and 215W (45V,

4Ω, 1% THD, BTL).

The TAS6684-Q1 integrates DC and AC load

diagnostics to determine the status of the connected

loads before enabling the output stage. During audio

playback, the status can be monitored through output

current sense and temperature of each channel

which is available for each channel, and reports the

measurement to a host processor through TDM with

minimal delay. The device monitors the output load

condition while playing audio using real-time load

diagnostics which operate independently from the

host and audio input.

To optimize system efficiency, the integrated DSP of

the TAS6684-Q1 enables Class-H envelope tracking

control, eliminating the need for the development of

complex tracking software and making local boost

voltage control possible without the need for an

external microcontroller.

The TAS6684-Q1 device features an additional lowlatency

signal path for each channel, providing up to

70% faster signal processing at 48kHz and support

latency < 100us of audio signal path at 96kHz

sample rate, which enables time-sensitive Active

Noise Cancellation (ANC), Road Noise Cancellation

(RNC) applications.

The TAS6684-Q1 is offered in a 64-pin QFP package

with the exposed thermal pad up, which package is

pin-to-pin compatible with TAS6584-Q1.