|
|
PDF RC6508 Data sheet ( Hoja de datos )
| Número de pieza | RC6508 | |
| Descripción | QAM IF Downconverter | |
| Fabricantes | Raytheon | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de RC6508 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
|
No Preview Available !
RC6508
QAM IF Downconverter
Electronics
Semiconductor Division
Features
• Integrated IF Down Converter
• IF bandwidth from 30 MHz to 80 MHz
• Operating range between 8.5V to 13.2V
• 63dB peak conversion gain from IF to baseband
• 40dB minimum AGC range
• Simple interface to SAW filter and A/D converter
• Gain control minimizes noise figure and distortion
• Tuner control feature interfaces with variety of tuners
• Industry standard 24 Lead SSOP package
Applications
• Digital Set-top Receivers
• Cable Modems
Description
The RC6508 simplifies the front-end design of cable modem
and set-top receivers. It is a cost-effective solution, since it
integrates IF amplifier, AGC, mixer, amplifier, tuner AGC,
VCO, XTAL OSC, and bandgap reference on a single chip.
The RC6508 downconverts the IF signal to baseband signal
for cable modem and set top receivers. The baseband signal
can be digitized and decoded with an external A/D converter
and a custom DSP demodulator. The input can directly inter-
face to a SAW filter and maintain a low noise figure. The gain
can be controlled over a 40dB range through an external
analog input signal. The gain reduction is done in two stages
with minimum noise figure and signal distortion. The IF out-
put is then down converted and filtered using a double bal-
anced mixer. The output can be further filtered with an
external filter prior to A/D conversion. The RC6508 has an
added feature that it provides an optimum tuner AGC control
voltage which is used to control the front end tuner gain.
The IF and Mixer section works at 9V and the oscillator
works on 5V supply. The RC6508 is available in a 24 Lead
SSOP package.
Block Diagram
VCC_HF
HFGND
IF_IN+
IF_IN–
IF_AGC
T_Strt
T_AGC
45dB
x2 –
+
VCC_RF (5V)
BB_GND
VCC_BB BB_Out
RF BB
LO
17dB
VCO
XTAL Osc
BANDGAP
REF
65-6508-01
Rev. 1.1.1
1 page  
PRODUCT SPECIFICATION
Typical Performance Characteristics
70
60
50
40
30
20
10
0
0V
0.5V 1.0V 1.5V 2.0V 2.5V 3.0V 3.5V 4.0V
IF_AGC
Figure 1. Typical IF_AGC Control Characteristics
70
60
50
40
30
20
10
0
40MHz
60MHz
80MHz
Figure 2. IF Input Bandwidth
RC6508
100MHz
60
55
50
45
40
35
30
25
20
15
10
20 30 40 50 60 70
IF Gain, dB
Figure 3. SFDR vs. RC6508/TMC1175AM7C40
(Raytheon Demo Board with 64 QAM demodulator)
36
34
32
30
28
26
24
22
20
-70 -68 -67 -66 -64 -60 -55 -49 -43 -30 -24
IF Input Power, dBm
Figure 4. S/N vs. IF Input Power
RC6508/TMC1175AM7C40 (A/D IN = 2Vpp)
(Raytheon Demo Board with 64 QAM demodulator)
5
5 Page 
PRODUCT SPECIFICATION
Mechanical Dimensions
24 Lead SSOP Package (5.3mm Body Width)
RC6508
Symbol
A
A1
A2
b
c
D
E
E1
e
L
N
α
ccc
Inches
Min. Max.
— .0.78
.002 —
.065 .073
.010 .015
.0035 .010
.311 .335
.291 .323
.197 .220
.026 BSC
.022 .037
24
0° 8°
— .004
Millimeters
Min. Max.
— 2.00
0.05 —
1.65 1.85
0.22 0.38
0.09 0.25
7.90 8.50
7.40 8.20
5.00 5.60
0.65 BSC
0.55 0.95
24
0° 8°
— 0.10
Notes
Notes:
1. Dimensioning and tolerancing per ANSI Y14.5M – 1982.
2. "D" and "E" do not include mold flash. Mold flash or protrusions
shall not exceed .006 inch (0.15mm).
3. "L" is the length of terminal for soldering to a substrate.
4. Terminal numbers are shown for reference only.
5. "C" dimension does not include solder finish thickness.
6. Symbol "N" is the maximum number of terminals.
D
24
13
INDEX
AREA
1
A A2
e
b
E1 E
12
-C-
A1
SEATING PLANE
LEAD COPLANARITY
d ccc C
α
L
c
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RC6508.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| RC6508 | QAM IF Downconverter | Raytheon |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |