RF COMMUNICATIONS PRODUCTS
SA604A
High performance low power FM IF system
Product specification
1997 Nov 07
Replaces data of December 15, 1994 IC17 Data Handbook
Philips Semiconductors
Philips Semiconductors |
Product specification |
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High performance low power FM IF system |
SA604A |
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DESCRIPTION
The SA604A 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 SA604A features higher IF bandwidth (25MHz) and temperature compensated RSSI and limiters permitting higher performance application compared with the SA604. The SA604A is available in a 16-lead SO (surface-mounted miniature) package.
FEATURES
•Low power consumption: 3.3mA typical
•Temperature compensated logarithmic Received Signal Strength Indicator (RSSI) with a dynamic range in excess of 90dB
•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
•SA604A meets cellular radio specifications
PIN CONFIGURATION
D Package
IF AMP DECOUPLING |
1 |
16 |
IF AMP INPUT |
GND |
2 |
15 |
IF AMP DECOUPLING |
MUTE INPUT |
3 |
14 |
IF AMP OUTPUT |
VCC |
4 |
13 |
GND |
RSSI OUTPUT |
5 |
12 |
LIMITER INPUT |
MUTE AUDIO OUTPUT |
6 |
11 |
LIMITER DECOUPLING |
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UNMUTE AUDIO OUTPUT |
7 |
10 |
LIMITER DECOUPLING |
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QUADRATURE INPUT |
8 |
9 |
LIMITER |
SR00311
Figure 1. Pin Configuration
APPLICATIONS
•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 |
TEMPERATURE RANGE |
ORDER CODE |
DWG # |
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16-Pin Plastic Small Outline (SO) package (Surface-mount) |
-40 to +85°C |
SA604AD |
SOT109-1 |
ABSOLUTE MAXIMUM RATINGS
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PARAMETER |
RATING |
UNITS |
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VCC |
Single supply voltage |
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9 |
V |
TSTG |
Storage temperature range |
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-65 to +150 |
°C |
TA |
Operating ambient temperature range SA604A |
40 to +85 |
°C |
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θJA |
Thermal impedance |
D package |
90 |
°C/W |
1997 Nov 07 |
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853-1431 18663 |
Philips Semiconductors |
Product specification |
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High performance low power FM IF system |
SA604A |
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BLOCK DIAGRAM
16 |
15 |
14 |
13 |
12 |
11 |
10 |
9 |
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GND |
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IF |
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LIMITER |
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AMP |
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LIMITER |
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QUAD |
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SIGNAL |
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DET |
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STRENGTH |
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VOLTAGE |
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REGULATOR |
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MUTE |
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GND |
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VCC |
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1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
SR00312
Figure 2. Block Diagram
DC ELECTRICAL CHARACTERISTICS
VCC = +6V, |
TA = 25°C; unless otherwise stated. |
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LIMITS |
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SYMBOL |
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PARAMETER |
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TEST CONDITIONS |
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SA604A |
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UNITS |
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MIN |
TYP |
MAX |
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VCC |
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Power supply voltage range |
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4.5 |
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8.0 |
V |
ICC |
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DC current drain |
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2.5 |
3.3 |
4.0 |
mA |
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Mute switch input threshold |
(ON) |
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1.7 |
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1.0 |
V |
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(OFF) |
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V |
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1997 Nov 07 |
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Philips Semiconductors |
Product specification |
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High performance low power FM IF system |
SA604A |
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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.
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LIMITS |
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SYMBOL |
PARAMETER |
TEST CONDITIONS |
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SA604A |
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UNITS |
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MIN |
TYP |
MAX |
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Input limiting -3dB |
Test at Pin 16 |
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-92 |
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dBm/50Ω |
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AM rejection |
80% AM 1kHz |
30 |
34 |
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dB |
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Recovered audio level |
15nF de-emphasis |
80 |
175 |
260 |
mVRMS |
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Recovered audio level |
150pF de-emphasis |
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530 |
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mVRMS |
THD |
Total harmonic distortion |
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-34 |
-42 |
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dB |
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S/N |
Signal-to-noise ratio |
No modulation for noise |
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73 |
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dB |
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RF level = -118dBm |
0 |
160 |
650 |
mV |
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RSSI output1 |
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RF level = -68dBm |
1.9 |
2.65 |
3.1 |
V |
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RF level = -18dBm |
4.0 |
4.85 |
5.6 |
V |
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RSSI range |
R4 = 100k (Pin 5) |
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90 |
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dB |
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RSSI accuracy |
R4 = 100k (Pin 5) |
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±1.5 |
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dB |
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IF input impedance |
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1.4 |
1.6 |
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kΩ |
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IF output impedance |
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0.85 |
1.0 |
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kΩ |
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Limiter input impedance |
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1.4 |
1.6 |
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kΩ |
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Unmuted audio output resistance |
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58 |
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kΩ |
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Muted audio output resistance |
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58 |
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kΩ |
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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) |
SA604A (1.5k)/SA605 (1.5k |
-97dBm |
-118dBm |
-47dBm |
-68dBm |
+3dBm |
-18dBm |
The SA605 and SA604A are both derived from the same basic die. The SA605 performance plots are directly applicable to the SA604A.
1997 Nov 07 |
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