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PDF NE58633 Data sheet ( Hoja de datos )
| Número de pieza | NE58633 | |
| Descripción | Noise reduction class-D headphone driver amplifier | |
| Fabricantes | NXP Semiconductors | |
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NE58633
Noise reduction class-D headphone driver amplifier
Rev. 03 — 19 January 2010
Product data sheet
1. General description
The NE58633 is a stereo, noise reduction, class-D, Bridge-Tied Load (BTL) headphone
driver amplifier. Each channel comprises a class-D BTL headphone driver amplifier, an
electret microphone low noise preamplifier, feedback noise reduction circuit and a music
amplifier input.
The NE58633 operates with a battery voltage of 0.9 V to 1.7 V. The chip employs an
on-chip DC-to-DC boost converter and internal Vref voltage reference which is filtered and
output to ground for noise decoupling. It features mute control and plop and click
reduction circuitry. The gain of the microphone amplifier and filter amplifier is set using
external resistors. Differential architecture provides increased immunity to noise.
The NE58633 is capable of driving 800 mVrms across a 16 Ω or 32 Ω load and provides
ElectroStatic Discharge (ESD) and short-circuit protection.
It is available in the 32-pin HVQFN32 (5 mm × 5 mm × 0.85 mm) package suitable for
high density small-scale layouts and is an ideal choice for noise reduction headphones
and educational audio aids.
2. Features
Low current consumption of 4.4 mA
0.9 V to 1.7 V battery operating voltage range
1 % THD+N at VO = 1 VM driving 16 Ω with a battery voltage of 1.5 V
10 % THD+N at 800 mVrms output voltage driving 16 Ω and 32 Ω loads with a battery
voltage of 1.5 V
Output noise voltage with noise reduction circuit typically 31 mVrms for Gv(cl) = 25 dB
On-chip mute function
Plop and click reduction circuitry
Class-D BTL differential output configuration
Electret microphone noise reduction polarization amplifier with external gain
adjustment using resistors
Music and filter amplifier with external gain adjustment using resistors
DC-to-DC converter circuitry (3 V output) with 2.5 mA (typical) load current
Internal voltage reference pinned out for noise decoupling
Available in HVQFN32 package
1 page  
NXP Semiconductors
NE58633
Noise reduction class-D headphone driver amplifier
8. Characteristics
Table 5. Electrical characteristics
Tamb = 25 °C; unless otherwise specified.
Symbol Parameter
Conditions
Min
|VO(offset)| output offset voltage
|VI(offset)| input offset voltage
measured differentially; inputs AC
grounded; Gv(cl) = 25 dB;
VBAT = 0.9 V to 1.7 V
music amplifier and noise reduction
microphone amplifier;
measured differentially
-
-
Zi input impedance
music amplifier, non-inverting terminal;
VBAT = 0.9 V to 1.7 V
microphone preamplifier;
VBAT = 0.9 V to 1.7 V
inverting terminal noise reduction
-
-
non-inverting terminal noise reduction -
ILI
VOH
VOL
Vref
IDD
RDSon
input leakage current
HIGH-level output voltage
LOW-level output voltage
reference voltage
supply current
drain-source on-state
resistance
music amplifier; inverting terminal
VBAT = 0.9 V to 1.7 V
music amplifier and noise reduction
microphone preamplifier; IOH = 1 mA;
VBAT = 0.9 V to 1.7 V
music amplifier and noise reduction
microphone preamplifier; IOH = 1 mA;
VBAT = 0.9 V to 1.7 V
VBAT = 0.9 V to 1.7 V
AC grounded; no load
VBAT = 1.7 V
VBAT = 1.5 V
VBAT = 1.3 V
VBAT = 1.05 V
VBAT = 0.9 V
VBAT = 0.9 V to 1.7 V; no load
-
2.6
-
-
[1]
-
-
-
-
-
-
fsw
Gv(cl)
Vth(mute)
switching frequency
closed-loop voltage gain
mute threshold voltage
VBAT = 0.9 V to 1.7 V
with noise reduction microphone circuit;
VBAT = 0.9 V to 1.7 V; RF = 18 kΩ
VBAT = 0.9 V to 1.7 V
LOW-level; active LOW (muted)
250
-
0
HIGH-level; inactive HIGH (unmuted) 1.0
Typ Max Unit
5 25 mV
1 - mV
10 -
kΩ
1 - kΩ
5 - kΩ
- 500 nA
- -V
- 0.35 V
0.5Vbst -
5.0 6.0
6.0 -
7.0 -
8.0 -
9.0 11
2.8 -
300 350
25 -
V
mA
mA
mA
mA
mA
Ω
kHz
dB
- 0.8 V
- -V
[1] Music amplifier at unity gain; noise preamplifier at 25 dB gain; noise preamplifier output connected to corresponding inverting input of
music amplifier; non-inverting inputs.
NE58633_3
Product data sheet
Rev. 03 — 19 January 2010
© NXP B.V. 2010. All rights reserved.
5 of 27
5 Page 
NXP Semiconductors
NE58633
Noise reduction class-D headphone driver amplifier
(1)
(2)
(3)
(4)
002aad930
At start-up, no signal on music input. No pop or click. The small glitches on trace (2) are just noise from the noise reduction
amplifier feed-through. Start-up delay approximately 135 ms.
(1) VBAT switch ON to 1.5 V (50 ms; 1.0 V)
(2) Difference between trace (3) and (4), which equates to the pop or click (0.5 ms; 0.54 V)
(3) OUTLP (50 ms; 1.0 V)
(4) OUTLN (50 ms; 1.0 V)
Fig 11. Power-on delay and pop-on noise performance
(1)
(2)
(1) 50 ms; 1.0 V
(2) 1 ms; 0.5 V
(3) 50 ms; 1.0 V
(4) 50 ms; 1.0 V
Fig 12. Pop-off click performance
(3)
(4)
NE58633_3
Product data sheet
Rev. 03 — 19 January 2010
002aad929
© NXP B.V. 2010. All rights reserved.
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