amplifier IC. ETK145 Datasheet
ETK145 is a digital audio power amplifier IC with maximum output of 2.1W (RL=4Ω)×1ch.
ETK145 has a “Pure Pulse Direct Speaker Drive Circuit” which directly drives speakers while reducing distortion of pulse
output signal and reducing noise on the signal, and realizes the highest standard low distortion rate characteristics and
low noise characteristics among digital amplifier ICs for mobile use.
In addition, circuit design with fewer external parts can be made depend on the condition of use because corresponds to
The ETK145 features nonclip output control function which detects output signal clip due to the over level input signal
and suppress the output signal clip automatically. Also the nonclip output control function can adapt the output clip
caused by power supply voltage down with battery. This is the difference from the traditional AGC (Auto Gain Control) or
ALC (Auto Level Control) circuit.
ETK145 has the powerdown function which can minimize the power consumption in the standby state.
As for protection function, over current protection function for speaker output terminal, over temperature protection
function for inside of the device, and low supply voltage malfunction preventing function are prepared.
2.1W×1ch (VDD=5.0V, RL=4Ω, THD+N=10%)
0.75W×1ch (VDD=3.6V, RL=8Ω, THD+N=10%)
Distortion Rate (THD+N)
0.03% (VDD=3.6V, RL=8Ω, PO=0.4W, 1kHz)
45µVrms (VDD=3.6V, Av=18dB)
84% (VDD=3.6V, RL=8Ω, PO=600mW)
78% (VDD=3.6V, RL=8Ω, PO=100mW)
94dB (VDD=3.6V, Av=18dB)
Overcurrent Protection function
Thermal Protection function
Low voltage Malfunction Prevention function
Pop noise reduction function
Powerdown control function
Powerdown High speed Recovery function