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PDF SA624 Data sheet ( Hoja de datos )
| Número de pieza | SA624 | |
| Descripción | High performance low power FM IF system with high-speed RSSI | |
| Fabricantes | Philips | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SA624 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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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
1 page  
Philips Semiconductors
High performance low power FM IF system with
high-speed RSSI
Product specification
SA624
NE624 TEST CIRCUIT
INPUT
C1
R1
R2
16
C2
R3
15 14 13
F1
C4
12 11
C5 C6
10 9
SA624
C3
12345 678
C8 C9
S1 R4 C10
Q = 20 LOADED
F2
C7
C12
MUTE
INPUT
VCC
C1 100nF + 80 – 20% 63V K10000–25V Ceramic
C2 100nF +10% 50V
C3 100nF +10% 50V
C4 100nF +10% 50V
C5 100nF +10% 50V
C6 10pF +2% 100V NPO Ceramic
C7 100nF +10% 50V
C8 100nF +10% 50V
C9 15nF +10% 50V
C10 150pF +2% 100V N1500 Ceramic
C11 1nF +10% 100V K2000-Y5P Ceramic
C12 6.8µF +20% 25V Tantalum
F1 455kHz Ceramic Filter Murata SFG455A3
F2 455kHz (Ce = 180pF) TOKO RMC 2A6597H
R1 51Ω +1% 1/4W Metal Film
R2 1500Ω +1% 1/4W Metal Film
R3 1500Ω +5% 1/8W Carbon Composition
R4 100kΩ +1% 1/4W Metal Film
C11
RSSI
OUTPUT
AUDIO
OUTPUT
DATA
OUTPUT
SIGNETICS
NE624 TEST CKT
SIGNETICS
NE624 TEST CKT
1997 Nov 07
Figure 3. SA624 Test Circuit
5
SR00442
5 Page 
Philips Semiconductors
High performance low power FM IF system with
high-speed RSSI
Product specification
SA624
will require careful attention to limiter interstage component
selection. This will be especially true with high IF frequencies which
require insertion loss or impedance reduction for stability.
At low frequencies the RSSI makes an excellent logarithmic AC
voltmeter.
For data applications the RSSI is effective as an amplitude shift
keyed (ASK) data slicer. If a comparator is applied to the RSSI and
the threshold set slightly above the no signal level, when an in-band
signal is received the comparator will be sliced. Unlike FSK
demodulation, the maximum data rate is somewhat limited. An
internal capacitor limits the RSSI frequency response to about
100kHz. At high data rates the rise and fall times will not be
symmetrical.
The RSSI output is a current-to-voltage converter similar to the
audio outputs. However, an external resistor is required. With a
91kΩ resistor, the output characteristic is 0.5V for a 10dB change in
the input amplitude.
Additional Circuitry
Internal to the SA624 are voltage and current regulators which have
been temperature compensated to maintain the performance of the
device over a wide temperature range. These regulators are not
accessible to the user.
200
Φ
175
150
125
100
75
50
25
0
0.95
Q = 20
Q = 10
Q = 100
Q = 80
Q = 60
0.975 1.0 1.025
ω ∆ω
Figure 12. Phase vs Normalized IF Frequency ω1 = 1 + ω1
1.05
SR00451
1997 Nov 07
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet SA624.PDF ] | |
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