MAX98090AETL+ Maxim Integrated, MAX98090AETL+ Datasheet - Page 140

• Manufacturer Part Number: MAX98090AETL+
• Description: Interface - CODECs 5V 130mW Stereo Headphone Amp
• Manufacturer: Maxim Integrated

Specifications of MAX98090AETL+

• Rohs: yes

MAX98090
Range 1 (V
put signal level is less than 10% of HPVDD, the output
signal swing is low and the power consumption for driving
the headphone load is small relative to the charge pump
quiescent consumption and switching losses. Therefore,
to minimize switching losses, the charge-pump frequency
is reduced to its lowest rate (~82kHz) and the bipolar out-
put supply rails are set to half of HPVDD or ±V
(Figure 40, Range 1).
Range 2 (10% of V
V
and 25% of HPVDD, the output signal swing is still less
than half of HPVDD. However, the load power consumption
requirements are now much higher than the charge-pump
Figure 40. Class H Amplifier Charge Pump Operating Ranges
www.maximintegrated.com
HPVDD
-V
-V
-V
-V
V
V
V
V
HPVDD
HPVDD
HPVDD
HPVDD
HPVDD
HPVDD
HPVDD
HPVDD
GND
2
GND
2
): When the output signal level is between 10%
2
2
HP_OUT
NEGATIVE TERMINAL (C1N)
POSITIVE TERMINAL (C1P)
V
OPERATING RANGE 1
HP_OUT
< 10% of V
HPVDD
< 10% V
HPVDD
≤ V
HPVDD
HP_OUT
): When the out-
-V
-V
-V
-V
V
V
V
V
HPVDD
HPVDD
HPVDD
HPVDD
HPVDD
HPVDD
HPVDD
HPVDD
GND
2
GND
2
2
2
< 25% of
HPVDD
10% V
HPVDD
NEGATIVE TERMINAL (C1N)
POSITIVE TERMINAL (C1P)
/2
OPERATING RANGE 2
≤ V
HP_OUT
quiescent consumption and switching losses. To meet the
increased load power requirements, the charge-pump
switching frequency increases (~660kHz) while the bipolar
output supply rails remain at half of HPVDD or ±V
(Figure 40, Range 2).
Range 3 (25% of V
output signal level exceeds 25% of HPVDD, the output
signal swing is much wider. As a result, the charge pump
now generates bipolar full HPVDD output supply rails
(±V
slightly lower (~500kHz). However, the increased voltage
differential allows the headphone output driver to reach
its maximum voltage swing and load driving capability
(Figure 40, Range 3).
Ultra-Low Power Stereo Audio Codec
< 25% V
HPVDD
HPVDD
). The switching frequency in this range is
-V
-V
-V
-V
V
V
V
V
HPVDD
HPVDD
HPVDD
HPVDD
HPVDD
HPVDD
HPVDD
HPVDD
2
2
GND
GND
2
2
HPVDD
NEGATIVE TERMINAL (C1N)
POSITIVE TERMINAL (C1P)
25% V
OPERATING RANGE 3
≤ V
HPVDD
HP_OUT
Maxim Integrated │ 140
≤ V
HP_OUT
): When the
HPVDD
/2