Datasheet

© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSA8049 • Rev. 1.0.2 5
FSA8049 — Audio Jack Detection and Configuration, MIC/GND Cross point Switch
AC Electrical Characteristics
All typical values are at T
A
=25°C unless otherwise specified.
Symbol Parameter V
DD
(V) Condition
T
A
= -40 to +85°C
Unit
Min. Typ. Max.
MIC Switch
THD Total Harmonic Distortion
(5)
3.8
R
T
=600 Ω, V
SW
=0.5 V
PP
,
f=20 Hz to 20 kHz,
V
IN
=1.8 V and 2.2 V
(Figure 4)
0.002 %
O
IRR
Off Isolation
(5)
3.8
f=20 kHz, R
S
=32 Ω,
C
L
=0 pF, R
T
=32 Ω
(Figure 5)
-108
dB
f=20 KHz, R
S
=600 Ω,
C
L
=0 pF, R
T
=600 Ω
(Figure 5)
-85
Parallel I/O
t
ON-GNDA
Switch Turn-On Time (MIC & GND
Switch), Measure 10/90
3.8
CEXT=Float
R
L
=10 kΩ, C
L
=10 pF
200 µs
CEXT=0.1 µF
R
L
=10 kΩ, C
L
=10 pF
140 ms
t
OFF-GNDA
Switch Turn-Off Time (MIC & GND
Switch), Measure 10/90
3.8
CEXT=Float
R
L
=10 kΩ, C
L
=10 pF
20 µs
CEXT=0.1 µF
R
L
=10 kΩ, C
L
=1 0pF
6 ms
t
OFF-MIC
Switch Turn-Off Time (MIC
Switch), Measure 10/90
3.8 R
L
=10 kΩ, C
L
=10 pF 100 ns
t
ON-DET
Detection Circuit NMOS On time 2.7 to 4.4 20 µs
t
OFF-DET
Detection Circuit NMOS OFF time 2.7 to 4.4 20 µs
t
DET
Detection Time of Audio Jack
GND and MIC Terminals
(6)
2.7 to 4.4 EN=1 50 ms
t
EN
Enable / Disable Time 2.7 to 4.4 EN=01, EN=10 15 µs
Power
PSRR Power Supply Rejection Ratio
(5)
3.8
Power Supply Noise
300mV
PP
, Measured
10/90%, f=217 Hz Square
Wave
-89 dB
Notes:
5. Guaranteed by characterization.
6. Detection time may be longer if there is noise in the system or a poor audio jack connection.