The MAX9722A/MAX9722B stereo headphone amplifiers are designed for
portable equipment where board space is at a premium. The
MAX9722A/MAX9722B use a unique DirectDrive architecture to produce
a ground-referenced output from a single supply, eliminating the
need for large DC-blocking capacitors, which saves cost, board
space, and component height. Additionally, the gain of the
amplifier is set internally (-2V/V, MAX9722B) or adjusted
externally (MAX9722A). The MAX9722A/MAX9722B deliver up to 70mW per
channel into a 16Ω load or 130mW into a 32Ω load and have low
0.009% THD+N. An 80dB at 217Hz power-supply rejection ratio (PSRR)
allows these devices to operate from noisy digital supplies without
an additional linear regulator. The MAX9722A/MAX9722B include ±8kV
ESD protection on the headphone outputs. Comprehensive
anticlick-and-pop circuitry suppresses audible clicks and pops on
startup and shutdown. A low-power shutdown mode reduces the supply
current to 0.1µA. The MAX9722A/MAX9722B operate from a single 2.4V
to 5.5V supply, consume only 5.5mA of supply current, feature
short-circuit and thermal-overload protection, and are specified
over the extended -40°C to +85°C temperature range. The devices are
available in tiny 16-pin thin QFN (3mm ✕ 3mm ✕ 0.8mm) and 16-pin
TSSOP packages.
Features
♦ 2.4V to 5.5V Single-Supply Operation
♦ High PSRR (80dB at 217Hz) Eliminates LDO
♦ No Bulky DC-Blocking Capacitors Required
♦ Ground-Referenced Outputs Eliminate DC Bias Voltage on Headphone
Ground Pin
♦ No Degradation of Low-Frequency Response Due to Output Capacitors
♦ Differential Inputs for Enhanced Noise Cancellation
♦ Adjustable Gain (MAX9722A) or Fixed -2V/V Gain (MAX9722B)
♦ 130mW per Channel into 32Ω
♦ Low 0.009% THD+N
♦ Integrated Click-and-Pop Suppression
♦ Low Quiescent Current (5.5mA)
♦ Short-Circuit and Thermal-Overload Protection
♦ ±8kV ESD-Protected Amplifier Outputs (Human Body Model)
♦ Available in a Space-Saving 16-Pin Thin QFN (3mm ✕ 3mm ✕ 0.8mm)
Package
Product Category:
Audio Amplifiers
MAX9722
Headphone Amplifiers
Class-AB
130 mW
SMD/SMT
2-Channel Headphone
TSSOP-16
32 Ohms
0.009 %
5.5 V
2.4 V
- 40 C
+ 85 C
Tube
CMRR - Common Mode Rejection Ratio:
- 60 dB
Ib - Input Bias Current:
50 nA
Operating Supply Current:
5.5 mA
Operating Supply Voltage:
2.4 V to 5.5 V
Pd - Power Dissipation:
755 mW
Product Type:
Audio Amplifiers
PSRR - Power Supply Rejection Ratio:
- 90 dB
Factory Pack Quantity:
96
Subcategory:
Audio ICs
Supply Type:
Single
Vos - Input Offset Voltage:
0.5 mV
Part # Aliases:
MAX9722
Unit Weight:
0.006102 oz
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