SA605

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© NXP Semiconductors N.V. 2014. All rights reserved.

Product data sheet

Rev. 5 — 14 November 2014

9 of 25

NXP Semiconductors

SA605

High performance low power mixer FM IF system

11. Application information

The layout is very critical in the performance of the receiver. We highly recommend our demo

board layout.

All of the inductors, the quad tank, and their shield must be grounded. A 10

F to 15 F or higher

value tantalum capacitor on the supply line is essential. A low frequency ESR screening test on this

capacitor ensures consistent good sensitivity in production. A 0.1

F bypass capacitor on the

supply pin, and grounded near the 44.545 MHz oscillator improves sensitivity by 2 dB to 3 dB.

(1) R5 can be used to bias the oscillator transistor at a higher current for operation above 45 MHz.

Recommended value is 22 k

, but should not be below 10 k.

Fig 4.

SA605 45 MHz application circuit

aaa-012965

mixer

IF amp

limiter

OSCILLATOR

RSSI

quad

detector

20

19

18

17

16

15

14

13

12

11

1

2

34

5

6789

10

mute

switch

700 Ω

C23

C21

FL1

FL2

R17

5.1 kΩ

C18 C17

C15

C5

L1

C1

C2

45 MHz

input

C7

L2

X1

C6

C8

R5(1)

C9

C10

C25

C11

C12

C13

R9

R10

R11

C14

C26

C3

C24

L3