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
1997 Nov 07
Philips Semiconductors
Philips Semiconductors
Product specification
High performance low power FM IF system with
high-speed RSSI
SA624
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.
PIN CONFIGURATION
D Package
IF AMP DECOUPLING 1
GND 2
MUTE INPUT 3
V
CC
4
16 IF AMP INPUT
15 IF AMP DECOUPLING
14 IF AMP OUTPUT
13 GND
12 LIMITER INPUT
11 LIMITER DECOUPLING
10 LIMITER DECOUPLING
9
LIMITER
RSSI OUTPUT 5
MUTE AUDIO OUTPUT 6
FEATURES
UNMUTE AUDIO OUTPUT 7
QUADRATURE INPUT 8
•
Low power consumption: 3.4mA typical
•
Temperature compensated logarithmic Received Signal Strength
Indicator (RSSI) with a dynamic range in excess of 90dB
SR00440
•
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
Figure 1. Pin Configuration
APPLICATIONS
•
SA624 meets cellular radio specifications
•
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
ORDERING INFORMATION
DESCRIPTION
16-Pin Plastic Small Outline (SO) package (Surface-mount)
TEMPERATURE RANGE
-40 to +85°C
ORDER CODE
SA624D
DWG #
SOT109-1
ABSOLUTE MAXIMUM RATINGS
SYMBOL
V
CC
T
STG
T
A
θ
JA
Single supply voltage
Storage temperature range
Operating ambient temperature range SA624
Thermal impedance
D package
PARAMETER
RATING
9
-65 to +150
-40 to +85
90
UNITS
V
°C
°C
°C/W
1997 Nov 07
2
853-1647 18664
Philips Semiconductors
Product specification
High performance low power FM IF system with
high-speed RSSI
SA624
BLOCK DIAGRAM
16
15
14
13
GND
IF
AMP
LIMITER
QUAD
DET
12
11
10
9
LIMITER
SIGNAL
STRENGTH
VOLTAGE
REGULATOR
MUTE
GND
V
CC
1
2
3
4
5
6
7
8
SR00441
Figure 2. Block Diagram
DC ELECTRICAL CHARACTERISTICS
V
CC
= +6V, T
A
= 25
°
C; unless otherwise stated.
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
V
CC
I
CC
Power supply voltage range
DC current drain
Mute switch input threshold
(ON)
(OFF)
4.5
2.5
1.7
3.4
SA624
TYP
MAX
8.0
4.2
1.0
V
mA
V
V
UNITS
1997 Nov 07
3
Philips Semiconductors
Product specification
High performance low power FM IF system with
high-speed RSSI
SA624
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
MIN
Input limiting -3dB
AM rejection
Recovered audio level
Recovered audio level
THD
S/N
Total harmonic distortion
Signal-to-noise ratio
No modulation for noise
RF level = -118dBm
RSSI output
1
RF level = -68dBm
RF level = -18dBm
IF freq. = 455kHz
IF level = -44dBm
RSSI output rise time
(10kHz pulse, no IF filter)
IF level = -16dBm
IF freq. = 10.7MHz
IF level = -44dBm
IF level = -16dBm
IF freq. = 455kHz
IF level = -44dBm
RSSI output fall time
(10kHz pulse, no IF filter)
IF level = -16dBm
IF freq. = 10.7MHz
IF level = -44dBm
IF level = -16dBm
RSSI range
RSSI accuracy
IF input impedance
IF output impedance
Limiter input impedance
Limiter output impedance
Limiter output level no load
Unmuted audio output resistance
Muted audio output resistance
R
4
= 100k (Pin 5)
R
4
= 100k (Pin 5)
1.4
0.85
1.4
1.6
4.2
90
+1.5
1.6
1.0
1.6
300
280
58
58
µs
µs
dB
dB
kΩ
kΩ
kΩ
Ω
mV
RMS
kΩ
kΩ
1.3
4.7
µs
µs
1.2
1.1
µs
µs
1.1
1.2
µs
µs
0
1.9
4.0
Test at Pin 16
80% AM 1kHz
15nF de-emphasis
150pF de-emphasis
-34
30
80
SA624
TYP
-92
34
175
530
-42
73
160
2.65
4.85
650
3.1
5.6
260
MAX
dBm/50Ω
dB
mV
RMS
mV
RMS
dB
dB
mV
V
V
UNITS
AC ELECTRICAL CHARACTERISTICS
Typical reading at T
A
= 25
°
C; V
CC
= +6V, unless otherwise stated.
NOTE:
1. SA604 data sheets refer to power at 50Ω 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
1997 Nov 07
4
Philips Semiconductors
Product specification
High performance low power FM IF system with
high-speed RSSI
SA624
F
1
NE624 TEST CIRCUIT
C
4
C
1
INPUT
R
1
16
15
14
13
12
11
10
9
C
7
SA624
C
3
1
2
3
4
5
6
7
8
Q = 20 LOADED
R
2
C
2
R
3
C
5
C
6
F
2
C
8
S
1
R
4
C
9
C
10
C
12
C
11
RSSI
OUTPUT
AUDIO
OUTPUT
DATA
OUTPUT
MUTE
INPUT
V
CC
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
F1
F2
R1
R2
R3
R4
100nF + 80 – 20% 63V K10000–25V Ceramic
100nF +10% 50V
100nF +10% 50V
100nF +10% 50V
100nF +10% 50V
10pF +2% 100V NPO Ceramic
100nF +10% 50V
100nF +10% 50V
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
51Ω +1% 1/4W Metal Film
1500Ω +1% 1/4W Metal Film
1500Ω +5% 1/8W Carbon Composition
100kΩ +1% 1/4W Metal Film
SIGNETICS
NE624 TEST CKT
GND
OFF
ON
VCC
GND
GND
IF
INPUT
M
U
T
E
RSSI
AUDIO
DATA
SIGNETICS
NE624 TEST CKT
GND
OFF
ON
VCC
GND
GND
1997 Nov 07
IF
INPUT
M
U
T
E
RSSI
AUDIO
DATA
SR00442
Figure 3. SA624 Test Circuit
5
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