Electrical characteristics (continued) – Rainbow Electronics MAX9877 User Manual
Page 5
MAX9877
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
_______________________________________________________________________________________
5
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
Slew Rate
SR
0.35
V/µs
Capacitive Drive
C
L
100
pF
Crosstalk
HPL to HPR, HPR to HPL, f = 20Hz to 20kHz
65
dB
Spread-spectrum modulation mode,
OSC = 00
588
±30
Fixed-frequency mode, OSC = 01
430
550
670
Charge-Pump Frequency
Fixed-frequency mode, OSC = 10
220
350
500
kHz
VOLUME CONTROL
Minimum Setting
_VOL = 1
-75
dB
Maximum Setting
_VOL = 31
0
dB
PGAIN_ = 00
0
PGAIN_ = 01
9
Preamp Gain
Input A or B
PGAIN_ = 10
20
dB
Speaker
100
Mute Attenuation
f = 1kHz, _VOL = 0
Headphone
110
dB
Zero-Crossing Detection Timeout
ZCD = 1
60
ms
ANALOG SWITCH
T
A
= +25°C
1.6
4.5
On-Resistance
R
ON
I
RXIN_
= 20mA, RXIN_
= 0V and V
DD,
BYPASS = 1
T
A
= T
MIN
to T
MAX
5.2
Ω
Series resistance
is 9.1
Ω per switch
0.05
0.25
Total Harmonic Distortion
V
DIF
= 2V
P-P
,
V
CM
= V
DD
/2,
f = 1kHz, BYPASS = 1,
T
A
= +25°C
No series resistors
0.3
%
Off-Isolation
BYPASS = 0, RXIN+ and RXIN- to GND =
50Ω, Z
SPK
= 8Ω + 68µH, f = 10kHz,
referred to speaker output signal
88
dB
DIGITAL INPUTS
Input-Voltage High (SDA, SCL)
V
H
1.4
V
Input-Voltage Low (SDA, SCL)
V
L
0.4
V
Input-Voltage Low (BIAS)
V
BL
0.15
V
Input Hysteresis (SDA, SCL)
V
HYS
80
mV
SDA, SCL Input Capacitance
C
IN
4
pF
Input Leakage Current
I
IN
SDA, SCL; T
A
= +25°C
±1.0
µA
BIAS Pullup Current
I
BIAS
94
µA
DIGITAL OUTPUTS (SDA Open Drain)
Output Low Voltage SDA
V
OL
I
SINK
= 3mA
0.4
V
Output Fall Time SDA
t
OF
V
H(MIN)
to V
L(MAX)
bus capacitance = 10pF
to 400pF, I
SINK
= 3mA
250
ns