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300MHz to 450MHz ASK Receiver
with Internal IF Filter
Typical Operating Characteristics (continued)
(Typical Application Circuit, V AVDD = V DD = V DVDD = 3.3V, f RF = 315MHz, T A = +25°C, unless otherwise noted.)
REGULATOR VOLTAGE
vs. REGULATOR CURRENT
PHASE NOISE
vs. OFFSET FREQUENCY
PHASE NOISE
vs. OFFSET FREQUENCY
3.15
V DD = 5V, +5V CIRCUIT
-50
f RF = 315MHz
-50
f RF = 433MHz
-60
-60
3.10
T A = +105 ° C
-70
-80
-70
-80
3.05
3.00
T A = +85 ° C
T A = +25 ° C
T A = -40 ° C
-90
-100
-110
-120
-90
-100
-110
-120
0
5
10
15
20
25
0.01
0.1
1
10
100
1000 10,000
0.01
0.1
1
10
100
1000 10,000
REGULATOR CURRENT (mA)
OFFSET FREQUENCY (kHz)
OFFSET FREQUENCY (kHz)
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12
NAME
ENABLE
XTAL2
XTAL1
AVDD
LNAIN
LNAOUT
MIXIN2
MIXIN1
IFC2
IFC1
IFC3
DVDD
FUNCTION
Enable Input. Internally pulled down to ground. Set V ENABLE = V DD for normal operation.
Crystal Input 2. Connect an external crystal from XTAL2 to XTAL1. Bypass to GND if XTAL1 is driven
from an AC-coupled external reference (see the Crystal Oscillator section).
Crystal Input 1. Connect an external crystal from XTAL2 to XTAL1. Can also be driven with an AC-
coupled external reference oscillator (see the Crystal Oscillator section).
Positive Analog Supply Voltage. Connect to DVDD. Bypass to GND with a 0.1μF capacitor as close as
possible to the device (see the Typical Application Circuit ). For 5.0V operation, AVDD is internally
connected to an on-chip 3.2V LDO regulator. For 3.3V operation, connect AVDD to V DD .
Low-Noise Amplifier Input. Must be AC-coupled (see the Low-Noise Amplifier section).
Low-Noise Amplifier Output. Must be connected to AVDD through a parallel LC tank circuit. AC-
couple to MIXIN2 (see the Low-Noise Amplifier section).
2nd Differential Mixer Input. Connect to the LNAOUT side of the LC tank filter through a 100pF
capacitor (see the Typical Application Circuit ).
1st Differential Mixer Input. Connect to the AVDD side of the LC tank filter through a 100pF capacitor
(see the Typical Application Circuit ).
IF Filter Capacitor Connection 2. This is for the Sallen-Key IF filter. Connect a capacitor from IFC2 to GND.
The value of the capacitor is determined by the IF filter bandwidth (see the Typical Application Circuit ).
IF Filter Capacitor Connection 1. This is for the Sallen-Key IF filter. Connect a capacitor from IFC1 to IFC3.
The value of the capacitor is determined by the IF filter bandwidth (see the Typical Application Circuit ).
IF Filter Capacitor Connection 3. This is for the Sallen-Key IF filter. Connect a capacitor from IFC3 to IFC1.
The value of the capacitor is determined by the IF filter bandwidth (see the Typical Application Circuit ).
Positive Digital Supply Voltage Input. Connect to AVDD. Bypass to GND with a 0.01μF capacitor as
close as possible to the device (see the Typical Application Circuit ).
6
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