MAX7036GTP+T Maxim Integrated Products, MAX7036GTP+T Datasheet - Page 11

• Manufacturer Part Number: MAX7036GTP+T
• Description: RF Receiver 300MHz to 450MHz ASK Receiver with Inter
• Manufacturer: Maxim Integrated Products

Specifications of MAX7036GTP+T

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

times larger than the resistor in the RC smoothing cir-
cuit between DSP and DSN. This circuit will provide an
instantaneous jump of one-half of the DSP increase
from “no signal” voltage to peak voltage, which then
decays with the same time constant as that of the
threshold build-up from the RC smoothing circuit. The
DC slicing voltage at DSN is slightly higher (by the ratio
of the two resistors in the circuit) than it would be with-
out the speed-up circuit. Always provide a capacitive
path from the PDOUT pin to ground when using the
peak-detector output.
Figure 4. Using PDOUT for Faster Startup
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 radiation.
At high frequencies, trace lengths that are λ/10 or
longer act as antennas.
DATAOUT
MAX7036
20
SLICER
DATA
C4
______________________________________________________________________________________
17
DSN
R1
Layout Considerations
16
DSP
300MHz to 450MHz ASK Receiver
FILTER
DATA
18
PDOUT
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
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 power-supply connections.
Table 2. Component Values
COMPONENT
with Internal IF Filter
C10
C11
C12
C13
C14
C15
C16
C1
C2
C3
C4
C5
C6
C7
C8
C9
R1
L1
L2
Y1
f
RF
9.8375MHz
0.01µF
= 315MHz
100pF
100pF
390pF
180pF
220pF
100pF
100nH
4.7pF
0.1µF
0.1µF
0.1µF
22pF
10pF
10pF
10pF
27nH
22kΩ
1µF
f
RF
13.55375MHz
= 433.92MHz
0.01µF
100pF
100pF
390pF
180pF
220pF
100pF
2.7pF
0.1µF
0.1µF
0.1µF
22pF
10pF
10pF
10pF
47nH
15nH
22kΩ
1µF
11