Philips Semiconductors

Product specification

SA636

Low voltage high performance mixer FM IF system

with high-speed RSSI

1997 Nov 07

4

AC ELECTRICAL CHARACTERISTICS

-45dBm; FM modulation = 1kHz with

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

SA636

UNITS

MIN

TYP

MAX

Input signal frequency

500

MHz

External oscillator (buffer)

500

MHz

Noise figure at 240MHz

12

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 gain

330

Ω load

38

dB

Limiter gain

330

Ω load

54

dB

Input limiting -3dB

Test at Pin 18

–105

dBm

AM rejection

80% AM 1kHz

50

dB

Data level

120

130

3dB data bandwidth

600

700

kHz

SINAD sensitivity

RF level = -111dBm

16

dB

THD

Total harmonic distortion

-43

-38

dB

S/N

Signal-to-noise ratio

No modulation for noise

60

dB

IF level = -118dBm

0.2

0.5

V

IF RSSI output with buffer

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)

System RSSI output

RF level = -10dBm

1.4

V

System SINAD

RF level = -106dBm

12

dB