Maxim MAX9777, Manual

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MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
4
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ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= 5.0V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, R
IN
= R
F
= 15k Ω , 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
±
1 µA
Input Low Leakage Current I
IL
V
IN
= 0V
±
1 µA
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. 1k Ω 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 32 Ω resistive load connected to GND. Speaker mode testing performed with 8 Ω
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.