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315MHz Low-Power, +3V Superheterodyne
Receiver
Pin Description
PIN
1
2, 7
3
4
5, 10
6
8
9
11, 15, 16,
23, 24
12
13
14
17
18
19
20
21
22
25
26
27
28
NAME
XTAL1
AV DD
LNAIN
LNASRC
AGND
LNAOUT
MIXIN1
MIXIN2
I.C.
MIXOUT
DGND
DV DD
IFIN1
IFIN2
DSP
DSN
OPP
DF
DATAOUT
PDOUT
PWRDN
XTAL2
FUNCTION
1st Crystal Input
Positive Analog Supply Voltage for RF Sections. Decouple to AGND with 0.01μF capacitors.
Low-Noise Amplifier Input
Low-Noise Amplifier Source. Connect inductor to ground to set LNA input impedance (see Low-
Noise Amplifier section).
Analog Ground
Low-Noise Amplifier Output
1st Differential Mixer Input. Must be AC-coupled to driving input.
2nd Differential Mixer Input. Must be AC-coupled to driving input.
Internally Connected. Do not make connection to these pins.
330 ? Mixer Output
Digital Ground
Positive Digital Supply Voltage. Decouple to DGND with a 0.01μF capacitor.
1st Differential Intermediate Frequency Limiter Amplifier Input
2nd Differential Intermediate Frequency Limiter Amplifier Input
Positive Data Slicer Input
Negative Data Slicer Input
Noninverting Op Amp. Input for the Sallen-Key data filter.
Data Filter Feedback Node. Input for the feedback of the Sallen-Key data filter.
Digital Baseband Data Output
Peak Detector Output
Power-Down Select Input. Drive this pin with a logic low to shut down the IC.
2nd Crystal Input
Detailed Description
The MAX1470 CMOS superheterodyne receiver and a
few external components provide the complete receive
chain from the antenna to the digital output data.
Depending on signal power and component selection,
data rates as high as 100kbps can be achieved.
The MAX1470 is designed to receive binary ASK data
on a 315MHz carrier. ASK modulation uses a difference
in amplitude of the carrier to represent logic 0 and logic
1 data.
Low-Noise Amplifier
The LNA is a cascode amplifier with off-chip inductive
degeneration that achieves approximately 16dB of
power gain with a 2.0dB noise figure and an IIP3 of
-18dBm. The gain and noise figure is dependent on
both the antenna matching network at the LNA input,
and the LC tank network between the LNA output and
the mixer inputs.
The off-chip inductive degeneration is achieved by con-
necting an inductor from LNASRC to AGND. This inductor
sets the real part of the input impedance at LNAIN, allow-
ing for a more flexible match for low-input impedance
such as a PC board trace antenna. A nominal value for
this inductor with a 50 ? input impedance is 15nH, but is
affected by PC board trace. See Typical Operating
Characteristics for the relationship between the induc-
tance and input impedance.
The LC tank filter connected to LNAOUT comprises L1
and C9 (see Typical Applications Circuit ). L1 and C9 val-
ues are selected to resonate at the RF input frequency of
315MHz. The resonant frequency is given by:
6
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