Datasheet

MAX9788
14V
P-P
, Class G Ceramic Speaker Driver
_______________________________________________________________________________________ 3
Note 2: All devices are 100% production tested at room temperature. All temperature limits are guaranteed by design.
Note 3: Testing performed with resistive and capacitive loads to simulate an actual ceramic/piezoelectric speaker load,
Z
L
= 1µF + 10Ω.
Note 4: Input DC bias voltage determines the maximum voltage swing of the input signal. Inputing a signal with a peak voltage
of greater than the input DC bias voltage results in clipping.
Note 5: 1.8V logic compatible.
Note 6: Amplifier/inputs AC-coupled to GND.
Note 7: Testing performed at room temperature with 10Ω resistive load in series with 1µF capacitive load connected across the BTL
output for speaker amplifier. Mode transitions are controlled by SHDN. V
CP
is the peak output transient expressed in dBV.
Note 8: Voltage gain is defined as: [V
OUT+
- V
OUT-
] / [V
IN+
- V
IN-
].
Note 9: PV
SS
is forced to -3.6V to simulate boosted rail.
Note 10: 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.
R
IN_
and R
FB_
have 0.5% tolerance. The Class G output stage has 12dB of gain. Any gain or attenuation at the input
stage will add to or subtract from the gain of the Class G output.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
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 3.3
V
RMS
V
CC
= 5V 2.4
V
CC
= 4.2V 1.67
V
CC
= 3.6V 1.25
Continuous Output Power P
OUT
1% THD+N, f = 1kHz,
R
L
= 8Ω
V
CC
= 3.0V 0.8
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
Z
L
= 1µF + 10Ω, V
OUT
= 1kHz / 1.9V
RMS
0.002
Total Harmonic Distortion Plus
Noise
THD+N
Z
L
= 1µF + 10Ω, V
OUT
= 1kHz / 4.0V
RMS
0.08
%
Signal-to-Noise Ratio SNR V
OUT
= 5.1V
RMS
, A-weighted 108 dB
Common-Mode Rejection Ratio CMRR f
IN
= 1kHz (Note 9) 68 dB
V
CC
= 5V 106
Dynamic Range DR A-weighted (Note 10)
V
CC
= 3.6V 105
dB
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
CPVDD
= V
SHDN
= 3.6V, V
GND
= V
CPGND
= 0V, R
IN+
= R
IN-
= 10kΩ, R
FB+
= R
FB-
= 10kΩ, R
FS
= 100kΩ, C1 = 4.7µF, C2 =
10µF; load connected between OUT+ and OUT-, Z
LOAD
= 10Ω + 1µF, unless otherwise stated; T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Notes 2, 3)