RF COMMUNICATIONS PRODUCTS
SA614A
Low power FM IF system
Product specification
Replaces data of December 15, 1994
IC17 Data Handbook
1997 Nov 07
Philips Semiconductors
Philips Semiconductors
Product specification
Low power FM IF system
SA614A
DESCRIPTION
The SA614A 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 SA614A features higher IF
bandwidth (25MHz) and temperature compensated RSSI and
limiters permitting higher performance application compared with the
SA604. The SA614A is available in a 16-lead dual-in-line plastic
and 16-lead SO (surface-mounted miniature) package.
PIN CONFIGURATION
D and N Packages
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
•
Low power consumption: 3.3mA typical
•
Temperature compensated logarithmic Received Signal Strength
Indicator (RSSI) with a dynamic range in excess of 90dB
UNMUTE AUDIO OUTPUT 7
QUADRATURE INPUT 8
SR00323
•
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
•
SA614A meets cellular radio specifications
•
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 Dual In-Line Package (DIP)
16-Pin Plastic Small Outline (SO) package (Surface-mount)
TEMPERATURE RANGE
-40 to +85°C
-40 to +85°C
ORDER CODE
SA614AN
SA614AD
DWG #
SOT38-4
SOT109-1
1997 Nov 07
2
853-0594 18663
Philips Semiconductors
Product specification
Low power FM IF system
SA614A
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
SR00324
Figure 2. Block Diagram
ABSOLUTE MAXIMUM RATINGS
SYMBOL
V
CC
T
STG
T
A
θ
JA
Single supply voltage
Storage temperature range
Operating ambient temperature range SA614A
Thermal impedance
D package
N package
PARAMETER
RATING
9
-65 to +150
-40 to +85
90
75
UNITS
V
°
C
°
C
°
C/W
°
C/W
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
3.3
SA614A
TYP
MAX
8.0
4.0
1.0
V
mA
V
V
UNITS
1997 Nov 07
3
Philips Semiconductors
Product specification
Low power FM IF system
SA614A
AC ELECTRICAL CHARACTERISTICS
Typical reading at T
A
= 25
°
C; V
CC
= +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
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
RSSI range
RSSI accuracy
IF input impedance
IF output impedance
Limiter input impedance
Unmuted audio output resistance
Muted audio output resistance
R
4
= 100k (Pin 5)
R
4
= 100k (Pin 5)
1.4
0.85
1.4
0
1.7
3.6
Test at Pin 16
80% AM 1kHz
15nF de-emphasis
150pF de-emphasis
-30
25
60
SA614A
TYP
-92
33
175
530
-42
68
160
2.50
4.80
80
+2.0
1.6
1.0
1.6
58
58
800
3.3
5.8
260
MAX
dBm/50Ω
dB
mV
RMS
mV
RMS
dB
dB
mV
V
V
dB
dB
kΩ
kΩ
kΩ
kΩ
kΩ
UNITS
NOTE:
1. SA614A data sheets refer to power at 50Ω input termination; about 21dB less power actually enters the internal 1.5k input.
SA614A (50)
SA614A (1.5k)/SA615 (1.5k)
-97dBm
-118dBm
-47dBm
-68dBm
+3dBm
-18dBm
The SA615 and SA614A are both derived from the same basic die. The SA615 performance plots are directly applicable to the SA614A.
1997 Nov 07
4
Philips Semiconductors
Product specification
Low power FM IF system
SA614A
NE614A TEST CIRCUIT
F
1
C
4
C
1
INPUT
R
1
Q = 20 LOADED
R
2
C
2
R
3
16
15
14
13
12
11
10
C
5
C
6
F
2
9
C
7
SA614A
C
3
1
2
3
4
5
6
7
8
C
8
S
1
R
4
C
9
C
10
C
12
C
11
RSSI
OUTPUT
AUDIO
OUTPUT
DATA
OUTPUT
MUTE
INPUT
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
NE614 TEST CKT
GND
OFF
ON
VCC
GND
GND
IF
INPUT
M
U
T
E
RSSI
AUDIO
DATA
SIGNETICS
NE614 TEST CKT
GND
OFF
ON
VCC
GND
GND
1997 Nov 07
IF
INPUT
M
U
T
E
RSSI
AUDIO
DATA
SR00325
Figure 3. SA614A Test Circuit
5
