Electrical characteristics (continued) – Rainbow Electronics MAX9877 User Manual
Page 4
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
= 16
Ω
53
Output Power
P
OUT
THD+N ≤ 1%
R
HP
= 32
Ω
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
= 32
Ω (P
OUT
= 10mW, f = 1kHz)
0.016
Total Harmonic Distortion Plus
Noise
THD+N
R
HP
= 16
Ω (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