Philips SA624D Datasheet
RF COMMUNICATIONS PRODUCTS
SA624
High performance low power FM IF
system with high-speed RSSI
Product specification
Replaces data of November 3, 1992
RF Data Handbook
Philips Semiconductors
1997 Nov 07
Philips Semiconductors Product specification
High performance low power FM IF system with
high-speed RSSI
DESCRIPTION
The SA624 is pin-to-pin compatible with the SA604A, but has faster
RSSI rise and fall time. The SA624 is an improved monolithic
low-power FM IF system incorporating two limiting intermediate
frequency amplifiers, quadrature detector, muting, logarithmic
received signal strength indicator, and voltage regulator. The SA624
features higher IF bandwidth (25MHz) and temperature
compensated RSSI and limiters permitting higher performance
application compared with the SA604. The SA624 is available in
16-lead SO (surface-mounted miniature) package.
FEA TURES
•Low power consumption: 3.4mA typical
•Temperature compensated logarithmic Received Signal Strength
Indicator (RSSI) with a dynamic range in excess of 90dB
•Fast RSSI rise and fall time
•Two audio outputs - muted and unmuted
•Low external component count; suitable for crystal/ceramic filters
•Excellent sensitivity: 1.5µV across input pins (0.22µV into 50Ω
matching network) for 12dB SINAD (Signal to Noise and Distortion
ratio) at 455kHz
•SA624 meets cellular radio specifications
PIN CONFIGURATION
IF AMP DECOUPLING
MUTE AUDIO OUTPUT
UNMUTE AUDIO OUTPUT
QUADRATURE INPUT
APPLICATIONS
•Digital cellular base station
•Cellular radio FM IF
•High performance communications receivers
•Intermediate frequency amplification and detection up to 25MHz
•RF level meter
•Spectrum analyzer
•Instrumentation
•FSK and ASK data receivers
D Package
1
GND
2
MUTE INPUT
RSSI OUTPUT
3
4
V
CC
5
6
7
8
Figure 1. Pin Configuration
SA624
16
IF AMP INPUT
15
IF AMP DECOUPLING
14
IF AMP OUTPUT
13
GND
12
LIMITER INPUT
LIMITER DECOUPLING
11
10
LIMITER DECOUPLING
9
LIMITER
SR00440
ORDERING INFORMATION
DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #
16-Pin Plastic Small Outline (SO) package (Surface-mount) -40 to +85°C SA624D SOT109-1
ABSOLUTE MAXIMUM RATINGS
SYMBOL PARAMETER RATING UNITS
T
V
θ
CC
STG
T
A
JA
Single supply voltage 9 V
Storage temperature range -65 to +150 °C
Operating ambient temperature range SA624 -40 to +85 °C
Thermal impedance D package 90 °C/W
1997 Nov 07 853-1647 18664
2
Philips Semiconductors Product specification
High performance low power FM IF system with
high-speed RSSI
BLOCK DIAGRAM
16 15 14 13 12 11 10 9
GND
IF
AMP
SIGNAL
STRENGTH
VOLTAGE
REGULATOR
GND
Figure 2. Block Diagram
V
CC
LIMITER
LIMITER
QUAD
MUTE
DET
SA624
87654321
SR00441
DC ELECTRICAL CHARACTERISTICS
VCC = +6V, TA = 25°C; unless otherwise stated.
LIMITS
SYMBOL PARAMETER TEST CONDITIONS SA624 UNITS
MIN TYP MAX
V
CC
I
CC
Power supply voltage range 4.5 8.0 V
DC current drain 2.5 3.4 4.2 mA
Mute switch input threshold (ON)
(OFF)
1.7
1.0
V
V
1997 Nov 07
3
Philips Semiconductors Product specification
High performance low power FM IF system with
high-speed RSSI
AC ELECTRICAL CHARACTERISTICS
Typical reading at TA = 25°C; VCC = +6V, unless otherwise stated. IF frequency = 455kHz; IF level = -47dBm; 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 SA624 UNITS
MIN TYP MAX
Input limiting -3dB Test at Pin 16 -92 dBm/50Ω
AM rejection 80% AM 1kHz 30 34 dB
Recovered audio level 15nF de-emphasis 80 175 260 mV
Recovered audio level 150pF de-emphasis 530 mV
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
RSSI output
RSSI output rise time IF level = -16dBm 1.2 µs
(10kHz pulse, no IF filter) IF freq. = 10.7MHz
RSSI output fall time IF level = -16dBm 4.7 µs
(10kHz pulse, no IF filter) IF freq. = 10.7MHz
RSSI range R4 = 100k (Pin 5) 90 dB
RSSI accuracy R4 = 100k (Pin 5) +1.5 dB
IF input impedance 1.4 1.6 kΩ
IF output impedance 0.85 1.0 kΩ
Limiter input impedance 1.4 1.6 kΩ
Limiter output impedance 300 Ω
Limiter output level no load 280 mV
Unmuted audio output resistance 58 kΩ
Muted audio output resistance 58 kΩ
NOTE:
1. SA604 data sheets refer to power at 50Ω input termination; about 21dB less power actually enters the internal 1.5k input.
1
SA604 (50) SA624 (1.5k)/SA605 (1.5k
-97dBm -118dBm
-47dBm -68dBm
+3dBm -18dBm
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
IF level = -44dBm 1.2 µs
IF level = -16dBm 1.1 µs
IF freq. = 455kHz
IF level = -44dBm 1.3 µs
IF level = -44dBm 1.6 µs
IF level = -16dBm 4.2 µs
SA624
RMS
RMS
RMS
1997 Nov 07
4
Philips Semiconductors Product specification
High performance low power FM IF system with
high-speed RSSI
F
SA624
C
8
R
C
11
4
1
C
4
RSSI
OUTPUT
NE624 TEST CIRCUIT
C
1
INPUT
R
1
C
3
R
16 15 14 13 12 11 10 9
S
1
MUTE
INPUT
C
2
2
R
3
C
12
V
CC
SA624
DATA
OUTPUT
Q = 20 LOADED
F
2
C
7
C
C
5
6
87654321
C
9
C
10
AUDIO
OUTPUT
C1
100nF + 80 – 20% 63V K10000–25V Ceramic
100nF +10% 50V
C2
100nF +
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
F1
F2
R1
R2
R3
R4
10% 50V
100nF +10% 50V
100nF +
10% 50V
10pF +
2% 100V NPO Ceramic
10% 50V
100nF +
10% 50V
100nF +
15nF +
10% 50V
150pF +
2% 100V N1500 Ceramic
1nF +10% 100V K2000-Y5P Ceramic
6.8µF +
20% 25V Tantalum
455kHz Ceramic Filter Murata SFG455A3
455kHz (Ce = 180pF) TOKO RMC 2A6597H
1% 1/4W Metal Film
51Ω +
1500Ω +
1% 1/4W Metal Film
1500Ω +
5% 1/8W Carbon Composition
100kΩ +
1% 1/4W Metal Film
SIGNETICS
NE624 TEST CKT
ON
V
CC
E
OFF
GND
M
U
T
RSSI AUDIO DATA
IF INPUT
SIGNETICS
NE624 TEST CKT
ON
V
CC
GND
GND
E
OFF
GND
M
U
T
RSSI AUDIO DATA
IF INPUT
1997 Nov 07
GND
GND
SR00442
Figure 3. SA624 Test Circuit
5
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