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RC6508 데이터시트 PDF




Raytheon에서 제조한 전자 부품 RC6508은 전자 산업 및 응용 분야에서
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부품번호 RC6508 기능
기능 QAM IF Downconverter
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RC6508 데이터시트, 핀배열, 회로
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




RC6508 pdf, 반도체, 판매, 대치품
RC6508
PRODUCT SPECIFICATION
DC Electrical Characteristics
VCC_RF, VCC_XTL = 5V; VCC_HF, VCC_BB, VCC2 = 9V; TA = 0 to 70°C, unless otherwise specified.
Parameter
PWIF
ICCHF
Power Consumption in IF
Front End Supply Current
ICCBB
ICCRF
VRT
VBBo
Tagc_hi
Tagc_lo
Back and Baseband Current
RF Supply Current
Reference Output Voltage
Baseband DC Output Swing
Tuner AGC for Maximum Gain
Tuner AGC for Minimum Gain
Conditions
9V Supply
12V Supply
9V Supply
5V Supply
IF_AGC = 5V
IF_AGC = 2V
Min.
1.95
3.5
Typ.
0.4
20
27
21
6
2.05
7.5
2
Max.
0.5
25
35
25
10
2.15
Units
W
mA
mA
mA
V
Vpp
V
V
AC Electrical Characteristics VCC_XTL, VCC_RF = 5V; VCC_HF, VCC_BB = 9V; IF_AGC = 2V;
Tsrt = 5V; TA = 0 to 70°C, unless otherwise specified.
Parameter
ZIFin
AC Input Impedance
CIFin
AC Equivalent Input Cap
Vis Input Sensitivity at Maximum Gain
IMD3
Two Tone Intermodulation
G
NF
Ragc
Sagc
BW_IF
IF to Baseband Gain
Noise Figure (Maximum Gain)
AGC Gain Range
AGC Sensitivity Average Slope
IF Bandwidth
fLO Down Conversion Frequency
ΦnLO
ΦnXTL
VCO Phase Noise
XTAL OSC Phase Noise
Note:
1. With the application of antialiasing filter as load.
Conditions
@43.75MHz
IF_IN±
Vagc=2.5V
f1/f2 = 43.75/42.75 MHz,
IF_IN = -16dBm,
VCO_IN = 0.1Vpp,
LO = 38.75MHz1
IF_AGC = 2V
IF_AGC = 0V-4V
T_Strt = 5V,
F_AGC = 0.8V-4V
0.1dB for 10MHz bands
0.1dB for 5MHz bands
VCO-IN=0.1Vpp
@ ±10KHz offset
@ ±3KHz offset
Min.
2
Typ. Max.
6
250
45
Units
K
pF
µV
dB
35 40
9
40 43
10
dB
dB
dB
dB/V
30 43.75 75 MHz
30 80
100 MHz
-80 dBC/Hz
-80 dBC/Hz
4

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RC6508 전자부품, 판매, 대치품
PRODUCT SPECIFICATION
VCO Internal Schematic
L1 1µH
VCO_FS(8)
0.1µF
VCC_RF (6)
C4
1nF 4.7µF
C5 C6
L2
33µH
0.1µF
C7
10pF
5pF
C1
C2
IC = 0.9MA
VCO–In (7)
Q1
Q4
TO MIXER
+
220pF C3
Q5
47.7
Q3
Internal
RFGND(5)
RC6508
+5V
1nF 1µF
C8 C9
The VCO can be designed as a Colpitts oscillator. The above
circuit application shows VCO with adjustable typical value
of 38.75 MHz. The frequency is controlled by the external
resonance circuit. The oscillating transistor is Q1 in common
base configuration. To inject signal in the mixer in place of
LO, the VCO_Fs must be open. The signal on the pin
VCO_In should be under 100mVp-p and AC
coupled.
Crystal Oscillator Internal Schematic
VCC-XTL (1)
0.1µF
1nF
C3
1µF
C4
L2
33µH
0.1µF
C5
1nF
C6
1µF
C7
+5V
C8
L3 8µH
6.8K
XTL-Tnk(3)
3.2K
3.2K
Q7 Q12
Q10 Q11
Q18
Q17
VCO-IN (7)
2K
XTL-OUT(4)
100pF
VCC-XTL
(1)
130µA
230µA
130µA
450µA
GND-XTL (2)
47pF C2
200
450µA
Internal
The crystal oscillator is an ECL inverter. It is necessary to
bias the XTL-Tnk with a choke to 5V VCC_XTL power sup-
ply. The output is about 0.7V DC lower than VCC_XTL with
an approximate swing of 0.5Vpp at the output. If the oscilla-
tor is not used, it is good to ground XTL_Tnk pin.
7

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관련 데이터시트

부품번호상세설명 및 기능제조사
RC6508

QAM IF Downconverter

Raytheon
Raytheon

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