Datasheet

AISG Integrated Transceiver
MAX9947
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 5V, V
L
= 3.3V, TXOUT connected with 50I to RXIN, 4.1kI resistor between BIAS and RES, 10kI resistor between RES and
GND, 1kI resistor between SYNCOUT and V
CC
, T
A
= T
MIN
to T
MAX
, unless otherwise specified. XTAL frequency 8.704MHz ±30ppm.
Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS
Input Low Threshold Voltage V
XTAL1_IL
0.3 x
V
CC
V
Input High Leakage Current I
XTAL1_IH
10
FA
Input Low Leakage Current I
XTAL1_IL
-10
FA
Output Low Voltage V
SYNCOUT_OL
SYNCOUT source 3.3mA 0.4 V
RECEIVER FILTER
Passband f
PB_L
, f
PB_H
Input amplitude 1.12V
P-P
(the input carrier is recognized)
1.1 4.17 MHz
Extra Carrier Receiver Immunity
Level 1
f
IM1_L
, f
IM1_H
2.176MHz carrier amplitude (112.4mV
P-P
Q3dB), extra carrier amplitude 0.8V
P-P
,
V
DIRMD1
= V
DIRMD2
= 0V (9.6kbps)
1.1 4.17 MHz
Extra Carrier Receiver Immunity
Level 2
f
IM2_L
, f
IM2_H
2.176MHz carrier amplitude (112.4mV
P-P
Q3dB), extra carrier amplitude 0.8V
P-P
,
V
DIRMD1
= 3.3V, V
DIRMD2
= 0V (38.4kbps),
V
DIRMD1
= 0V, V
DIRMD2
= 3.3V (115.2kbps)
4.17 MHz
RECEIVER
Input Voltage Range V
IN
V
CC
= 3.0V to 5.5V, f
RXIN
= 2.176MHz 1.12 V
P-P
Equivalent Input Power Range P
IN
V
CC
= 3.0V to 5.5V, f
RXIN
= 2.176MHz +5 dBm
Input Impedance Z
IN
f = f
O
11 27
kI
Threshold Voltage Range V
TH
f
RXIN
= 2.176MHz
-18 -15 -12 dBm
79.72 112.4 158.48 mV
P-P
TRANSMITTER
Output Frequency f
O
2.176 MHz
Output Frequency Variation
Df
O
(Note 5)
Q100
ppm
Output On Level at TXOUT
(Note 6)
V
OUT
V
RES
= 1.5V (maximum)
11.1 12 dBm
2.24 2.52 V
P-P
V
RES
= 0.7V (minimum)
5.38 6.28 dBm
1.30 1.17 V
P-P
Output Off Power Level at
TXOUT (Note 6)
P
OUT
OOK off level -40 dBm
Output Emission Profile
f = f
O
Q200kHz
-10
dB
f = f
O
Q500kHz
-30
10MHz P f P 25MHz
-41
25MHz P f (Note 7)
-72
f P 1MHz
-41
Output Impedance Z
OUT
DC 0.03
I
f = 10MHz 2.5
Amplifier Gain Bandwidth GBW 54 MHz
TXOUT Short-Circuit Protection I
SC
Short to GND or V
CC
, guaranteed over V
CC
range
Q200
mA