Owner's manual

MAX9877
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= 3.7V, V
GND
= V
PGND
= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS = 0,
SHDN = 1. Speaker loads (Z
SPK
) connected between OUT+ and OUT-. Headphone loads (R
HP
) connected from HPL or HPR to GND.
SDA and SCL pullup voltage = 3.3V. Z
SPK
= ∞, R
HP
= ∞. C1 = C2 = C
BIAS
= 1µF. T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical
values are at T
A
= +25°C.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Spread-spectrum modulation mode,
OSC = 00
1176
±60
Fixed-frequency mode, OSC = 01 1100
Output Frequency
Fixed-frequency mode, OSC = 10 700
kHz
Current Limit 1.5 A
Efficiency η P
OUT
= 600mW, f = 1kHz 87 %
Speaker Gain A
V
11.5 12.0 12.5 dB
Output Noise
A-weighted, OUTMODE = 1, ΔIN_ = 0
(Note 4)
63 µV
RMS
HEADPHONE AMPLIFIERS (OUTMODE = 2)
T
A
= +25°C (volume at mute) ±0.15 ±0.6
Output Offset Voltage V
OS
T
A
= +25°C (volume at 0dB) ±1.6
mV
Into shutdown -80
Click-and-Pop Level K
CP
Peak voltage, T
A
=
+25°C, A-weighted,
32 samples per
second. volume at
mute (Note 4)
Out of shutdown -80
dBV
PV
DD
= V
DD
= 2.7V
to 5.25V
70 85
f = 217Hz,
V
RIPPLE
= 100mV
P-P
84
f = 1kHz,
V
RIPPLE
= 100mV
P-P
80
Power-Supply Rejection Ratio
(Note 4)
PSRR
T
A
= +25°C, PV
DD
=
V
DD
f = 20kHz,
V
RIPPLE
= 100mV
P-P
62
dB
R
HP
= 16Ω 53
Output Power P
OUT
THD+N ≤ 1%
R
HP
= 32Ω 27
mW
Headphone Gain A
V
-0.4 0 +0.4 dB
Channel-to-Channel Gain
Tracking
T
A
= +25°C, HPL to HPR, volume at 0dB,
OUTMODE = 2, 5; ΔIN_ = 0
±0.3 ±2.5 %
R
HP
= 32Ω (P
OUT
= 10mW, f = 1kHz) 0.016
Total Harmonic Distortion Plus
Noise
THD+N
R
HP
= 16Ω (P
OUT
= 10mW, f = 1kHz),
T
A
= +25°C
0.03
%
ΔIN_ = 0
(single-ended)
98
A-weighted,
OUTMODE = 2, 3,
5, 6; R
HP
= 16Ω
ΔIN_ = 1 (differential) 98
ΔIN_ = 0
(single-ended)
96
Signal-to-Noise Ratio SNR
A-weighted, R
HP
=
16Ω, OUTMODE =
8, 9
ΔIN_ = 1 (differential) 96
dB