FAN3850T Fairchild Semiconductor, FAN3850T Datasheet - Page 5

• Manufacturer Part Number: FAN3850T
• Description: Microphone Pre-Amplifier
• Manufacturer: Fairchild Semiconductor

© 2011 Fairchild Semiconductor Corporation
FAN3850T • Rev. 3.0.0
Electrical Characteristics
Unless otherwise specified, all limits are guaranteed for T
duty cycle = 50%, and C
Notes:
3.
4.
5.
6.
7.
8.
9.
10. Device falls asleep when f
11. Guaranteed by design.
12. Temperature coefficient is calculated by measuring gain in db at 50˚C and -10°C and dividing by 60 (Gain(50°C)
t
Symbol
FALLASLEEP
t
CLK
WAKEUP
C
f
Pseudo-random noise with triangular probability density function. Bandwidth up to 10MHz.
Assumes 120dB(SPL) is mapped to 0Dbfs.
Assumes an input -41, or -38dBV, depending on the part-specific gain.
Verified by design simulation, showing idle tones and low noise level modulation to be typical 96dB.
Guaranteed by characterization.
All parameters are tested at 2.4MHz. Frequency range guaranteed by characterization.
Device wakes up when f
– Gain(-10°C)/60).
LOAD
CLK
t
t
t
t
A
B
A
B
dc
Time from CLOCK Transition
to Data Becoming Valid
Time from CLOCK Transition
to Data Becoming Hi-Z
Time from CLOCK Transition
to Data Becoming Valid
Time from CLOCK Transition
to Data Becoming Hi-Z
Input CLOCK Frequency
CLOCK Duty Cycle
Wake-Up Time
Fall-Asleep Time
Load Capacitance on Data
Parameter
MIC
=15pF.
(9)
CLK
(10)
CLK
≥ 300kHz.
(7)
≤ 70kHz.
(Continued)
(8)
Figure 3. Interface Timing
On Falling Edge of CLOCK,
SELECT=GND, C
On Rising Edge of CLOCK,
SELECT=GND, C
On Rising Edge of CLOCK,
SELECT=V
On Falling Edge of CLOCK,
SELECT=V
Active Mode
f
f
CLK
CLK
=2.4MHz
=2.4MHz
Condition
DD
DD
5
, C
, C
LOAD
LOAD
LOAD
LOAD
A
=25°C, V
=15pF
=15pF
=15pF
=15pF
DD
=1.8V, V
Min.
1.0
18
18
40
0
0
0
IN
=94dB (SPL), f
Typ.
0.35
0.01
2.4
43
56
50
5
5
Max.
2.00
1.00
100
4.0
16
16
60
CLK
www.fairchildsemi.com
=2.4MHz,
Unit
MHz
ms
ms
pF
ns
ns
ns
ns
%