MAX9875
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= V
PVDD
= 3.7V, V
GND
= V
PGND
= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, 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 9Preamp 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
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
4pF
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
2-WIRE INTERFACE TIMING
External Pullup Voltage Range:
SDA and SCL
1.7 3.6 V
Serial Clock Frequency f
SCL
DC 400 kHz
Bus Free Time Between STOP
and START Conditions
t
BUF
1.3 µs
START Condition Hold t
HD:STA
0.6 µs
START Condition Setup Time t
SU:STA
0.6 µs
Clock Low Period t
LOW
1.3 µs
Clock High Period t
HIGH
0.6 µs
