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PDF SA614A Data sheet ( Hoja de datos )
| Número de pieza | SA614A | |
| Descripción | Low power FM IF system | |
| Fabricantes | Philips | |
| Logotipo |  |
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RF COMMUNICATIONS PRODUCTS
SA614A
Low power FM IF system
Product specification
Replaces data of December 15, 1994
IC17 Data Handbook
Philips Semiconductors
1997 Nov 07
1 page  
Philips Semiconductors
Low power FM IF system
Product specification
SA614A
NE614A TEST CIRCUIT
INPUT
C1
R1
R2
16
C2
R3
15 14 13
F1
C4
12 11
C5 C6
10 9
SA614A
C3
12345 678
C8 C9
S1 R4 C10
Q = 20 LOADED
F2
C7
C12
MUTE
INPUT
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
NE614 TEST CKT
SIGNETICS
NE614 TEST CKT
1997 Nov 07
Figure 3. SA614A Test Circuit
5
SR00325
5 Page 
Philips Semiconductors
Low power FM IF system
Product specification
SA614A
optimized at 0.22µV for 12dB SINAD with minor change in the RSSI
linearity.
Any application which requires optimized RSSI linearity, such as
spectrum analyzers, cellular radio, and certain types of telemetry,
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 SA614A 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
Figure 12.
Phase vs Normalized IF Frequency
w
wI
+
1
)
Dw
wI
1.05
SR00334
1997 Nov 07
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SA614A.PDF ] | |
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