Philips Semiconductors

Product specification

SA626

Low voltage high performance mixer FM IF system

with high-speed RSSI

1997 Sept 25

4

AC ELECTRICAL CHARACTERISTICS

-68dBm; FM modulation = 1kHz with

±125kHz peak deviation. Audio output with C-message weighted filter and de-emphasis filter. Test circuit

Figure 1. The parameters listed below are tested using automatic test equipment to assure consistent electrical characteristics. The limits do

not represent the ultimate performance limits of the device. Use of an optimized RF layout will improve many of the listed parameters.

LIMITS

SYMBOL

PARAMETER

TEST CONDITIONS

SA626

UNITS

MIN

TYP

MAX

Input signal frequency

500

MHz

External oscillator (buffer)

500

MHz

Noise figure at 240MHz

14

dB

Third-order input intercept point

Matched f1=240.05; f2=240.35MHz

-16

dBm

Conversion power gain

Matched 14.5dBV step-up

8

11

14

dB

RF input resistance

Single-ended input

700

Ω

RF input capacitance

3.5

pF

Mixer output resistance

(Pin 20)

330

Ω

IF section

IF amp power gain

38

dB

Limiter amp power gain

54

dB

Input limiting -3dB

Test at Pin 18

–105

dBm

AM rejection

80% AM 1kHz

50

dB

Audio level

Unity gain

120

160

200

Audio DC level

Pin 9, no signal

1.0

V

SINAD sensitivity

IF level = -111dBm

16

dB

THD

Total harmonic distortion

-43

–38

dB

S/N

Signal-to-noise ratio

No modulation for noise

60

dB

IF RSSI output with buffer

IF level = -118dBm

0.2

0.5

V

IF level = -68dBm

0.3

0.6

1.0

V

IF level = -10dBm

0.9

1.3

1.8

V

IF RSSI output rise time

IF frequency = 10.7MHz

(10kHz pulse, no 10.7MHz filter)

RF level = -56dBm

1.2

µs

(no RSSI bypass capacitor)

RF level = -28dBm

1.1

µs

IF RSSI output fall time

IF frequency = 10.7MHz

(10kHz pulse, no 10.7MHz filter)

RF level = -56dBm

2.0

µs

(no RSSI bypass capacitor)

RF level = -28dBm

7.3

µs

RSSI range

90

dB

RSSI accuracy

+1.5

dB

IF input impedance

330

Ω

IF output impedance

330

Ω

Limiter input impedance

330

Ω

Limiter output impedance

300

Ω

Limiter output level with no load

130

RF/IF section (int LO)

Audio level

RF level = -10dBm

160

System RSSI output

RF level = -10dBm

1.4

V

System SINAD

RF level = -106dBm

12

dB