Manual
MAX9730
2.4W, Single-Supply, Class G Power Amplifier
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= CPV
DD
= SHDN = 3.6V, GND = CPGND = 0V, R
IN+
= R
IN-
= 10kΩ, R
FB+
= R
FB-
= 10kΩ, R
FS
= 100kΩ, C1 = 4.7µF, C2 =
10µF; speaker load resistors (R
L
) are terminated between OUT+ and OUT-, unless otherwise stated; T
A
= T
MIN
to T
MAX
, unless other-
wise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
Note 1: All devices are 100% production tested at room temperature. All temperature limits are guaranteed by design.
Note 2: Testing performed with resistive and inductive loads to simulate an actual speaker load. For dynamic speakers,
R
L
= 8Ω, 68µH.
Note 3: Designed for 1.8V logic.
Note 4: R
IN_
and R
FB_
have 0.5% tolerance.
Note 5: Amplifier inputs AC-coupled to GND.
Note 6: Testing performed at room temperature with 8Ω resistive load in series with 68µH inductive load connected across BTL
output for speaker amplifier. Mode transitions are controlled by SHDN. V
CP
is the peak output transient expressed in dBV.
Note 7: Voltage gain is defined as: [V
OUT+
- V
OUT-
] / [V
IN+
- V
IN-
].
Note 8: Mode A tone burst tested at full amplitude for one cycle and half amplitude for nine cycles. Mode B tone burst tested at
full amplitude for three cycles and half amplitude for seven cycles. Full amplitude is defined as 1% THD+N at full battery
(V
CC
= 4.2V).
Electrical Characteristics
table targets must be met at THD+N = 1% for one cycle (Mode A) and THD+N <
5% for three cycles (Mode B).
Note 9: Dynamic range is calculated by measuring the RMS voltage difference between a -60dBFS output signal and the noise
floor, then adding 60dB. Full scale is defined as the output signal needed to achieve 1% THD+N.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Voltage Gain A
V
(Notes 4, 7) 11.5 12 12.5 dB
V
CC
= 5V 2.4
V
CC
= 4.2V 1.67
V
CC
= 3.6V 1.25
Continuous Output Power P
OUT
THD+N = 1%, f = 1kHz,
R
L
= 8Ω
V
CC
= 3.0V 0.8
V
RMS
V
CC
= 5V 7.1
V
CC
= 4.2V 5.9
V
CC
= 3.6V 5.1
f = 1kHz, 1% THD+N,
Z
L
= 1µF + 10Ω
V
CC
= 3.0V 4.2
V
CC
= 5V 6.5
V
CC
= 4.2V 5.4
V
CC
= 3.6V 4.7
Output Voltage V
OUT
f = 10kHz, 1% THD+N,
Z
L
= 1µF + 10Ω, no
load
V
CC
= 3.0V 3.8
W
V
CC
= 2.7V to 5.5V 63 77
f = 217Hz, 200mV
P-P
ripple 77
f = 1kHz, 200mV
P-P
ripple 77
Power-Supply Rejection Ratio
(Note 4)
PSRR
f = 20kHz, 200mV
P-P
ripple 58
dB
R
L
= 8Ω, V
OUT
= 1kHz / 400mW 0.007
Total Harmonic Distortion Plus
Noise
THD+N
R
L
= 8Ω, V
OUT
= 1kHz / 1W 0.12
%
Signal-to-Noise Ratio SNR
V
OUT
= 0.5W, inputs to GND by C1N,
A-weighted
95 dB
22Hz to 22kHz 96
Dynamic Range DR (Note 9)
A-weighted 99
dB