MAX7036(2010) データシートの表示（PDF） - Maxim Integrated

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MAX7036
(Rev.:2010)

300MHz to 450MHz ASK Receiver with Internal IF Filter

Maxim Integrated 

300MHz to 450MHz ASK Receiver

with Internal IF Filter

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.

MAX7036

DATA

FILTER

DATA

SLICER

20

DATAOUT

17

16

DSN

DSP

R1

C4

18

PDOUT

Figure 4. Using PDOUT for Faster Startup

Layout Considerations

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.

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

C1

C2

C3

C4

C5

C6

C7

C8

C9

C10

C11

C12

C13

C14

C15

C16

L1

L2

R1

Y1

fRF = 315MHz

4.7pF

100pF

100pF

0.1μF

390pF

180pF

1μF

0.01μF

22pF

10pF

0.1μF

220pF

10pF

10pF

100pF

0.1μF

100nH

27nH

22kΩ

9.8375MHz

fRF = 433.92MHz

2.7pF

100pF

100pF

0.1μF

390pF

180pF

1μF

0.01μF

22pF

10pF

0.1μF

220pF

10pF

10pF

100pF

0.1μF

47nH

15nH

22kΩ

13.55375MHz

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