SM8224B
AC Electrical Characteristics
Measurement conditions: R1 = 430kΩ, R2 = 34kΩ, R3 = 390kΩ, C1= 0.22µF
FSK decoder
VDD = 5.0V ± 0.5V, GND = 0V, fCLK = 3.579545MHz, Ta = −20 to 85°C unless otherwise noted.
Parameter
Symbol
Input sensitivity
S/N ratio1
FSKSNR
Carrier detection sensitivity
Carrier non-detection sensitivity
Oscillator frequency
CD ON
CDOFF
fC L K
1. M a r k signal and SPA CE signal are same level.
Noise: Random noise from 200Hz to 3400Hz.
Condition
Rating
Unit
min
typ
max
–
−4 3
CDON
dBm
20
–
–
dB
–
−4 3
−3 7 . 7 8
dBm
−5 0
−4 6
–
dBm
typ − 0.1% 3.579545 typ + 0.1%
MHz
Dual tone detector
VDD = 5.0V ± 0.5V, GND = 0V, fCLK = 3.579545MHz, Ta = −20 to 85°C unless otherwise noted.
Parameter
Frequency (low frequency)
Frequency (high frequency)
Detection frequency deviation
Non-detection frequency deviation
Detection sensitivity
Non-detection sensitivity
Signal level deviation
Symbol
fL
fH
Condition
Rating
Unit
min
typ
max
–
2130
–
Hz
–
2750
–
Hz
1.1
–
–
%
3.5
–
–
%
−3 7 . 7 8
–
–
dBm
–
–
−4 3 . 7 8
dBm
–
–
6
dB
Note: (S0, S1, MODE) = (VD D, 0V, 0V)
Input-stage amplifier Characteristics
VDD = 5.0V ± 0.5V, GND = 0V, fCLK = 3.579545MHz, Ta = −20 to 85°C unless otherwise noted.
Parameter
Input leakage current
DC open-loop voltage gain
Unity gain frequency
Load capacitance
Load resistance
Symbol
IIN
G OL
fC
CL
RL
Condition
Rating
Unit
min
typ
max
–
–
1
µA
30
–
–
dB
80
–
–
kHz
–
–
100
pF
50
–
–
kΩ
NIPPON PRECISION CIRCUITS—6