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PDF AN1890 Data sheet ( Hoja de datos )
| Número de pieza | AN1890 | |
| Descripción | Using SA7025 and SA8025A | |
| Fabricantes | Philips | |
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INTEGRATED CIRCUITS
AN1890
Using the SA7025 (RevA) and SA8025A
for narrow band systems
Author: Wing S. Djen
1997 Aug 20
Philips
Semiconductors
1 page  
Philips Semiconductors
Using the SA7025(RevA) and SA8025A for narrow band systems
Application note
AN1890
Table 2. Performance Comparison: SA8025 to SA8025A
Fractional spurs (dBc) @25kHz, VCO=1606.625MHz
Fractional spurs (dBc) @50kHz, VCO=1606.625MHz
Fractional spurs (dBc) @25kHz, VCO=1631.025MHz
Fractional spurs (dBc) @50kHz, VCO=1631.025MHz
Close-in noise (dBc/Hz) @1kHz, VCO=1631.025MHz
ITOTAL (mA) for the demo board
Switching time (ms)
SA8025
-41.5
(CN=250, RF=560kΩ)
not present
(CN=250, RF=560kΩ)
-59.0
(CN=200, RF=560kΩ)
not present
(CN=200, RF=560kΩ)
-65
28.3
<1.5
SA8025A
-60.6
not present
-59.5
not present
-65
28.3
<1.5
Figure
11
11
13
13
10
15, 16
SA8025A for the PHS System
Philips Semiconductors applications note AN1891, “Using the
SA8025 in 2GHz band applications”, shows a design for the PHS
system based on the SA8025. If the SA8025A is used in the same
design, only RF needs to be changed.
Crystal frequency (fXTAL) = 19.2MHz
Mid VCO frequency (fVCO) = 1665MHz
Q (fractional modulus) = 8
IRN = 80µA
CN = 100
Using Eq. 1 and Eq. 2
IRF
+
3
@
80e-6 @ 100 @ 19.2e6
8 @ 1865e6
+ 34.6mA
RF
+
3
–
0.9
– 150 @ Ǹ34.6e-6
34.6e-6
+ 35.2kW
On the demo board, RF=36kΩ was used. The measured fractional
spurs when NF=1 and NF=7 are both better than -70dBc.
Table 3 summarizes the components change for the
SA7025/SA8025 and the SA7025 (RevA)/SA8025A demo boards.
Table 3. Summary of Component Changes
Component
SA7025
SA7025
(Rev A)
SA8025 SA8025A
R21
560kΩ
47kΩ
560kΩ
36kΩ
R22
33kΩ
51kΩ
10kΩ
10kΩ
R23
24kΩ
13kΩ
10kΩ
10kΩ
R24
22kΩ
100kΩ
18kΩ
18kΩ
R25
22kΩ
0Ω
0Ω
0Ω
C30
330pF
NL
NL
NL
C31
3.3nF
10nF
3.9nF
3.9nF
C32
220pF
1nF
390pF
390pF
C33
220pF
18pF
150pF
150pF
C34
100pF
NL
NL
NL
NL = Not Loaded
1997 Aug 20
7–5
5 Page 
Philips Semiconductors
Using the SA7025(RevA) and SA8025A for narrow band systems
Application note
AN1890
TOP SILK SCREEN
1997 Aug 20
Figure 19. SA8025ADK Demoboard Layout (NOT ACTUAL SIZE)
7–11
SR01020
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AN1890.PDF ] | |
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