Owner's manual

MAX9877
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Preamp = 0dB 47
Preamp = +9dB 49Common-Mode Rejection Ratio CMRR
f
IN
= 1kHz (differential
input mode)
Preamp = +20dB 42
dB
Input DC Voltage IN_ inputs 1.22 1.3 1.38 V
Bias Voltage V
BIAS
1.13 1.2 1.27 V
SPEAKER AMPLIFIER (OUTMODE = 1)
T
A
= +25°C (volume at mute) ±0.5 ±4
Output Offset Voltage V
OS T
A
= +25°C (volume at 0dB,
OUTMODE = 1, ΔIN_ = 0)
±1.5
mV
Into shutdown -70
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 -70
dBV
PV
DD
= V
DD
=
2.7V to 5.5V
50 76
f = 217Hz,
100mV
P-P
ripple
72
f = 1kHz,
100mV
P-P
ripple
68
Power-Supply Rejection Ratio
(Note 4)
PSRR
T
A
= +25°C, PV
DD
=
V
DD
f = 20kHz,
100mV
P-P
ripple
55
dB
Z
SPK
= 8Ω +
68µH, V
DD
= 3.7V
725
Z
SPK
= 8Ω +
68µH, V
DD
= 3.3V
560
Z
SPK
= 8Ω +
68µH, V
DD
= 3.0V
465
Z
SPK
= 4Ω +
33µH, V
DD
= 3.7V
825
Output Power (Note 5) P
OUT
THD+N ≤ 1%
Z
SPK
= 4Ω +
33µH, V
DD
= 3.0V
770
mW
Total Harmonic Distortion Plus
Noise
THD+N
f = 1kHz, P
OUT
= 350mW, T
A
= +25°C,
Z
SPK
= 8Ω + 68µH
0.05 %
ΔIN_ = 0
(single-ended)
92
A-weighted,
OUTMODE = 1, 3,
4, 6
ΔIN_ = 1 (differential) 94
ΔIN_ = 0
(single-ended)
88
Signal-to-Noise Ratio SNR
A-weighted,
OUTMODE = 7, 9
ΔIN_ = 1 (differential) 92
dB
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)