SA58640 Просмотр технического описания (PDF) - NXP Semiconductors.

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производитель

SA58640

Low-voltage mixer FM IF system

NXP Semiconductors. 

NXP Semiconductors

SA58640

Low-voltage mixer FM IF system

300

Vo(aud)RMS

(mV)

250

VCC = 7 V

002aab133

200

5V

150

100

−55 −35 −15 5

25 45 65 85 105 125

Tamb (°C)

Fig 7. RMS audio output voltage versus ambient temperature

13. Application information

C26

R17

2.4 kΩ

R18

3.3 kΩ

FL1

C23

C21

FL2

C18 C17

C15

20

19

18

17

16

15

14

13

12

11

SA58640

45 MHz input

1

2

3

C1

L1

C2

C6

C5

4

5

6

C8

C7

C9

L2

X1

C10

7

8

9

10

R11

10 kΩ

R10

10 kΩ

C27

2.2 μF

C12

IFT1

R19

11 kΩ

C19

390 pF

C14

RSSI_OUT VCC

AUDIO_OUT

002aab126

Fig 8.

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 μF to 15 μF 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 μF bypass capacitor on the supply pin VCC, and grounded near the 44.545 MHz oscillator improves sensitivity

by 2 dB to 3 dB.

45 MHz application circuit

SA58640

Product data sheet

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

Rev. 3 — 12 April 2011

© NXP B.V. 2011. All rights reserved.

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