MAX7042ATJ+ Maxim Integrated Products, MAX7042ATJ+ Datasheet - Page 15

• Manufacturer Part Number: MAX7042ATJ+
• Description: RF Receiver IC RCVR RF LP FSK-EP -433.92MHz Low-Power
• Manufacturer: Maxim Integrated Products
• Type: Receiverr

Specifications of MAX7042ATJ+

• Operating Frequency: 433.92 MHz
• Operating Supply Voltage: 2.5 V or 3.3 V or 5 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.4 V
• Package / Case: TQFN EP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

A properly designed PCB is an essential part of any
RF/microwave circuit. On high-frequency inputs and
outputs, use controlled-impedance lines and keep
them as short as possible to minimize losses and radia-
tion. At high frequencies, trace lengths that are on the
order of λ/10 or longer act as antennas.
Keeping the traces short also reduces parasitic induc-
tance. Generally, 1in of a PCB trace adds about 20nH
of parasitic inductance. The parasitic inductance can
RF INPUT
Low-Power, FSK Superheterodyne Receiver
C16
______________________________________________________________________________________
C6
C7
Y1
C13
Layout Considerations
308MHz/315MHz/418MHz/433.92MHz
L1
C14
C15
4
5
6
7
8
L3
RSSI
XTAL2
XTAL1
AV
LNAIN
9 10
DD
31
11
C11
30
C9
L2
29
C10
MAX7042
12
28
C8
have a dramatic effect on the effective inductance of a
passive component. For example, a 0.5in trace con-
necting a 100nH inductor adds an extra 10nH of induc-
tance or 10%.
To reduce the parasitic inductance, use wider traces
and a solid ground or power plane below the signal
traces. Also, use low-inductance connections to ground
on all GND pins, and place decoupling capacitors
close to all V
27
13 14
26
IN
C12
GND
Y2
15
PDMAX
DD
PDMIN
DGND
Typical Application Circuit
DV
16
OUT
OP+
DS+
DS-
DF
DD
or HV
24
23
22
21
20
19
18
17
IN
connections.
C1
C3
C2
C4
R1
C5
15