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MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
4
______________________________________________________________________________________________________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= 5.0V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, R
IN
= R
F
= 15kΩ, R
L
= ∞. T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
2-WIRE SERIAL INTERFACE (SCL, SDA, ADD, INT) (MAX9777)
Input-Voltage High V
IH
2.6 V
Input-Voltage Low V
IL
0.8 V
Input Hysteresis 0.2 V
Input High Leakage Current I
IH
V
IN
= 5V ±1µA
Input Low Leakage Current I
IL
V
IN
= 0V ±1µA
Input Capacitance C
IN
10 pF
Output-Voltage Low V
OL
I
OL
= 3mA 0.4 V
Output Current High I
OH
V
OH
= 5V 1 µA
TIMING CHARACTERISTICS (MAX9777)
Serial Clock Frequency f
SCL
400 kHz
Bus Free Time Between STOP
and START Conditions
t
BUF
1.3 µs
START Condition Hold Time t
HD:STA
0.6 µs
START Condition Setup Time t
SU:STA
0.6 µs
Clock Period Low t
LOW
1.3 µs
Clock Period High t
HIGH
0.6 µs
Data Setup Time t
SU:DAT
100 ns
Data Hold Time t
HD:DAT
(Note 3) 0 0.9 µs
Receive SCL/SDA Rise Time t
r
(Note 4)
20 +
0.1C
B
300 ns
Receive SCL/SDA Fall Time t
f
(Note 4)
20 +
0.1C
B
300 ns
Transmit SDA Fall Time t
f
(Note 4)
20 +
0.1C
B
250 ns
Pulse Width of Suppressed
Spike
t
SP
(Note 5) 50 ns
Note 1: All devices are 100% production tested at +25°C. All temperature limits are guaranteed by design.
Note 2: Inputs AC-coupled to GND.
Note 3: A master device must provide a hold time of at least 300ns for the SDA signal to bridge the undefined region of SCL’s
falling edge.
Note 4: C
B
= total capacitance of one of the bus lines in picofarads. Device tested with C
B
= 400pF. 1kΩ pullup resistors connected
from SDA/SCL to V
DD
.
Note 5: Input filters on SDA, SCL, and ADD suppress noise spikes of less than 50ns.
Note 6: Headphone mode testing performed with 32Ω resistive load connected to GND. Speaker mode testing performed with 8Ω
resistive load connected to GND. Mode transitions are controlled by SHDN. KCP level is calculated as 20log[(peak voltage
during mode transition, no input signal)/1V
RMS
]. Units are expressed in dBV.