TFA9843AJ_1 © Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Preliminary data sheet Rev. 01 — 28 April 2006 8 of 19
Philips Semiconductors TFA9843AJ
20 W stereo power amplifier with volume control
[1] The noise output voltage is measured at the output in a frequency range from 20 Hz to 22 kHz
(unweighted), with a source impedance ZS=0Ω at the input.
[2] Supply voltage ripple rejection is measured at the output, with a source impedance ZS=0Ω at the input
and with a frequency range from 20 Hz to 22 kHz (unweighted). The ripple voltage is a sine wave with a
frequency fripple and an amplitude of 300 mV (RMS), which is applied to the positive supply rail.
[3] Output voltage in Mute mode (VI(VC) = 1.35 V) and an input voltage of 1 V (RMS) in a bandwidth from 20 Hz
to 22 kHz, including noise.
VCC = 18 V THD = 10 %
Fig 3. Voltage gain as a function of volume control
voltage Fig 4. Output power (one channel) as a function of
supply voltage for various loads
001aae340
VI(VC) (V)
0 6.04.02.0
−50
−100
0
50
GV
(dB)
−150 8
40
60
20
012 28
VCC (V)
16 20
Po
(W)
24
mce485
RL = 1 Ω
8 Ω
4 Ω
3 Ω2 Ω
VCC = 18 V; f = 1 kHz; RL = 4 ΩVCC = 18 V; Po = 1 W; RL = 4 Ω
Fig 5. Total harmonic distortion-plus-noise as a
function of output power Fig 6. Total harmonic distortion-plus-noise as a
function of frequency
102
10
1
10−1
10−2
mce488
10−1102
110
Po (W)
THD + N
(%)
10
1
10−1
10−2
001aaa446
10
THD+N
(%)
f (Hz)
102103104105