NXP Semiconductors
TFA9872_SDS
High Efficiency Class-D Audio Amplifier with Speaker-as-Microphone
TFA9872_SDS All information provided in this document is subject to legal disclaimers. © NXP B.V. 2017. All rights reserved.
Product short data sheet Rev. 1 — 12 April 2017
COMPANY PUBLIC 15 / 32
Symbol Parameter Conditions Min Typ Max Unit
S/N signal-to-noise ratio I
O
= 1.1A (peak); A-weighted 62 65 - dB
over frequency; 20 Hz to 4 kHz - - 3 %
over temperature; f
i
= 1 kHz; T
j
=
-20 °C to 85 °C
- 2 - %
ΔI
sense
current sense mismatch
over V
DDP
; f
i
= 1 kHz, V
DDP
= 2.7 V to
9.5 V
- 1 - %
THD+N total harmonic distortion-plus-noise f
i
= 20 Hz to 20 kHz; V
i
= -6 dBFS;
TDMSPKG = 0110
- - 0.75 %
B bandwidth
[2]
0.02 - 20 kHz
Speaker-as-microphone performance; pins OUTA, OUTB
PGAGAIN = 30 dB (± 1.5 dB
accuracy)
- 27.6 - dB
PGAGAIN = 24 dB (± 1.5 dB
accuracy)
- 22.2 - dB
PGAGAIN = 18 dB (± 1.5 dB
accuracy)
- 16.8 - dB
GPGA PGA gain
PGAGAIN = 16 dB (± 1.5 dB
accuracy)
- 14.9 - dB
PGAGAIN = 18 dB; RMS value
[3]
- 10.5 - mVV
i(max)
maximum input voltage
PGAGAIN = 30 dB; RMS value
[4]
- 3.0 - mV
A-weighted, PGAGAIN: 30 dB; TDM
Output; RMS value
- 1.05 - μV
A-weighted, PGAGAIN: 16 dB; TDM
Output; RMS value
- 2.35 - μV
A-weighted, PGAGAIN: 30 dB; PDM
Output; RMS value
- 1.20 - μV
V
n(i)(eq)
equivalent input noise voltage
A-weighted, PGAGAIN: 16 dB; PDM
Output; RMS value
- 1.35 - μV
A-weighted; PDM output; full scale
input; PGAGAIN: 18 dB;
- 78.6 - dB
A-weighted; PPDM Output
Full scale input, PGA gain setting
GAIN_00
- 70.3 - dB
A-weighted; PTDM output; full scale
input; PGAGAIN: 18 dB;
- 76.9 - dB
S/N signal-to-noise ratio
TDM output; full scale input;
PGAGAIN: 30 dB
- 69.6 - dB
f
i
= 1 kHz, V
i
= 0.5ΩmV (RMS),
maximum PGA gain setting (30 dB),
on pin OUTA/OUTB
- 0.3 - %THD+N total harmonic distortion-plus-noise
f
i
= 1 kHz, V
i
= 0. 5 mV (RMS),
maximum PGA gain setting (30 dB),
on pin AUXSAMN/AUXSAMP
- 0.45 - %
