Philips Semiconductors

Product specification

SA615

High performance low power mixer FM IF system

1997 Nov 07

4

AC ELECTRICAL CHARACTERISTICS

level = –45dBm; FM modulation = 1kHz with +8kHz peak deviation. Audio output with C-message weighted filter and de-emphasis capacitor.

Test circuit Figure 3. The parameters listed below are tested using automatic test equipment to assure consistent electrical characterristics.

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

SA615

UNITS

MIN

TYP

MAX

Mixer/Osc section (ext LO = 300mV)

Input signal frequency

500

MHz

Crystal oscillator frequency

150

MHz

Noise figure at 45MHz

5.0

dB

Third-order input intercept point

f1 = 45.00; f2 = 45.06MHz

-12

dBm

Conversion power gain

Matched 14.5dBV step-up

8.0

13

dB

50

Ω source

-1.7

dB

RF input resistance

Single-ended input

3.0

4.7

k

Ω

RF input capacitance

3.5

4.0

pF

Mixer output resistance

(Pin 20)

1.25

1.50

k

Ω

IF section

IF amp gain

50

Ω source

39.7

dB

Limiter gain

50

Ω source

62.5

dB

Test at Pin 18

-109

dBm

AM rejection

80% AM 1kHz

25

33

43

dB

15nF de-emphasis

60

150

260

S

150pF de-emphasis

530

mV

SINAD sensitivity

RF level -118dB

12

dB

THD

Total harmonic distortion

-30

-42

dB

S/N

Signal-to-noise ratio

No modulation for noise

68

dB

IF level = -118dBm

0

160

800

mV

IF level = -68dBm

1.7

2.5

3.3

V

IF level = -18dBm

3.6

4.8

5.8

V

RSSI range

80

dB

RSSI accuracy

+2

dB

IF input impedance

1.40

1.6

k

Ω

IF output impedance

0.85

1.0

k

Ω

Limiter intput impedance

1.40

1.6

k

Ω

Unmuted audio output resistance

58

k

Ω

Muted audio output resistance

58

k

Ω

RF/IF section (int LO)

Unmuted audio level

450

S

System RSSI output

4.3

V

NOTE:

1. The generator source impedance is 50

Ω, but the SA615 input impedance at Pin 18 is 1500Ω. As a result, IF level refers to the actual signal

that enters the SA615 input (Pin 8) which is about 21dB less than the ”available power” at the generator.