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SA676DK/01

Low-voltage mixer FM IF system

NXP Semiconductors. 

NXP Semiconductors

13. Application information

SA676

Low-voltage mixer FM IF system

C26 R18

3.3 kΩ

R17

C15

2.4 kΩ

FL1

C23

FL2

C21

C18 C17

20 19 18 17 16 15 14 13 12 11

mixer

IF amp

OSC RSSI

limiter

quad

45 MHz

input

1

C1

L1

C2

VREG

audio

2 3 4 5 67

89

C9

C8

C7

C10

R11

10 kΩ

R10 C12

10 kΩ

C5

L2

C27

R19

2.2 μF 11 kΩ

C6

X1

C19

390 pF

RSSI_OUT VCC AUDIO_OUT

10

IFT1

C14

002aag117

Fig 9.

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 will ensure 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.

SA676 45 MHz application circuit (SA676DK demo board)

SA676

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 3 — 19 July 2012

© NXP B.V. 2012. All rights reserved.

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