Philips Semiconductors

Product specification

SA624

High performance low power FM IF system with

high-speed RSSI

1997 Nov 07

4

AC ELECTRICAL CHARACTERISTICS

+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

SA624

UNITS

MIN

TYP

MAX

Input limiting -3dB

Test at Pin 16

-92

dBm/50

Ω

AM rejection

80% AM 1kHz

30

34

dB

Recovered audio level

15nF de-emphasis

80

175

260

Recovered audio level

150pF de-emphasis

530

THD

Total harmonic distortion

-34

-42

dB

S/N

Signal-to-noise ratio

No modulation for noise

73

dB

RF level = -118dBm

0

160

650

mV

RF level = -68dBm

1.9

2.65

3.1

V

RF level = -18dBm

4.0

4.85

5.6

V

IF freq. = 455kHz

IF level = -44dBm

1.1

µs

RSSI output rise time

IF level = -16dBm

1.2

µs

(10kHz pulse, no IF filter)

IF freq. = 10.7MHz

IF level = -44dBm

1.2

µs

IF level = -16dBm

1.1

µs

IF freq. = 455kHz

IF level = -44dBm

1.3

µs

RSSI output fall time

IF level = -16dBm

4.7

µs

(10kHz pulse, no IF filter)

IF freq. = 10.7MHz

IF level = -44dBm

1.6

µs

IF level = -16dBm

4.2

µs

RSSI range

90

dB

RSSI accuracy

+1.5

dB

IF input impedance

1.4

1.6

k

Ω

IF output impedance

0.85

1.0

k

Ω

Limiter input impedance

1.4

1.6

k

Ω

Limiter output impedance

300

Ω

Limiter output level no load

280

Unmuted audio output resistance

58

k

Ω

Muted audio output resistance

58

k

Ω

NOTE:

1. SA604 data sheets refer to power at 50

Ω input termination; about 21dB less power actually enters the internal 1.5k input.

SA604 (50)

SA624 (1.5k)/SA605 (1.5k

-97dBm

-118dBm

-47dBm

-68dBm

+3dBm

-18dBm