Sony CXA3068N Datasheet
L-band Down Converter for Satellite Tuner
Description
The CXA3068N is a monolithic IC to down-convert
the L-band (930 to 2150 MHz) signal for the satellite
broadcasting receiver. It has a double-balanced
mixer, local oscillator circuit and IF amplifier on chip.
Features
• Balance-type Colpitts oscillator circuit provides a
stable and wide range oscillation.
Oscillation frequency : 2.63 GHz
• Small leak of the local oscillation signal due to the
double-balanced mixer.
• Oscillation frequency drift is small, caused by the
change of impedance at the pre-stage of RF input.
• Local oscillator output circuit for PLL.
• Single 5 V power supply operation.
• Low current consumption. ICC=53 mA (typ.)
• 16-pin SSOP package contributes to reduction in
set size.
Absolute Maximum Ratings (Ta=25 °C)
• Supply voltage VCC –0.3 to +5.5 V
• Storage temperature Tstg –55 to +150 °C
• Allowable power dissipation
Operating Conditions
• Supply voltage VCC 4.75 to 5.3 V
• Ambient temperature Topr –20 to 75 °C
CXA3068N
16 pin SSOP (Plastic)
PD 625 mW
(When mounted on board)
Applications
• Satellite broadcasting tuners for BS, CS, DSS and
DVB. (Frequency conversion to the second IF)
Structure
Bipolar silicon monolithic IC
Block Diagram and Pin Configuration
VCC1
1 2 3 4 5 6 7 8
GND1
OSCB1
IF AMP
NC
OSC
NC
MIX
OSCB2
GND1
10111213141516
BUFF
OSCOUT1
9
IFOUT
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
VCC2
GND2
GND2
RFIN1
RFIN2
—1—
GND1
OSCOUT2
E95Z07-TE
Pin Description and Equivalent Circuit
CXA3068N
Pin
No. voltage (V)
1
2
3
4
Symbol
IF OUT
VCC2
GND2
GND2
Typical pin
2.5
5.0
0
0
Equivalent circuit Description
VCC2
2
1
IF output.
IF block power supply.
IF block GND.
IF block GND.
5
6
7
8
9
RF IN1
RF IN2
GND1
OSC OUT2
OSC OUT1
1.8
1.8
0
3.5
3.5
5 6
2k
40
VCC1
40
2k
16
9
8
RF input.
Normally, a decoupling capacitor
is connected at Pin 5 to GND and
Pin 6 is used for input.
RF block GND.
Local oscillation output.
—2—
CXA3068N
Pin
No. voltage (V)
10
11
12
13
14
15
16
Symbol
GND1
OSC B2
NC
NC
OSC B1
GND1
VCC1
Typical pin
0
2.4
—
—
2.4
0
5.0
Equivalent circuit Description
RF block GND.
14 11
Oscillator.
2k
2k
RF block GND.
RF block power supply.
—3—
CXA3068N
Electrical Characteristics (Ta=25 °C, VCC=5 V, refer to the Electrical Characteristics Measurement Circuit.)
Input frequency: 950 to 2150 MHz
No
1
Current consumption
2
Conversion gain ∗1
3
Noise figure ∗1, 2
4
Local oscillation output
5
IF maximum output
RF pin local oscillation
6
leakage
IF pin local oscillation
7
leakage
Third-order
8
intermodulation
distortion ∗1, 3
Local oscillation phase
9
noise
10
IF output VSWR
11
RF input impedance
∗
1) Measured value for untuned inputs.
∗
2) Noise figure is uncorrected for image.
∗
3) Measure S/I of the desired intermediate frequency (480 MHz) and distortion component (460 MHz) with a
Item
Symbol
ICC
CG1
CG2
CG3
NF1
NF2
NF3
POSC1
POSC2
POSC3
PO (sat)
RFLK1
RFLK2
RFLK3
IFLK1
IFLK2
IFLK3
IM3
CN1
CN2
IFVSWR
rπ
Cπ
Measurement conditions
No signal
fin = 950 MHz, fIF = 480 MHz
fin = 1450 MHz, fIF = 480 MHz
fin = 2150 MHz, fIF = 480 MHz
fin = 950 MHz, fIF = 480 MHz
fin = 1450 MHz, fIF = 480 MHz
fin = 2150 MHz, fIF = 480 MHz
fOSC = 1430 to 1830 MHz
fOSC = 1830 to 2230 MHz
fOSC = 2230 to 2630 MHz
fIF = 480 MHz
fOSC = 1430 to 1830 MHz
fOSC = 1830 to 2230 MHz
fOSC = 2230 to 2630 MHz
fOSC = 1430 to 1830 MHz
fOSC = 1830 to 2230 MHz
fOSC = 2230 to 2630 MHz
Pin = –25 dBm
fin = 950 MHz + 960 MHz
fout = 470 MHz + 480 MHz
S/I of 460 MHz and 480 MHz
fOSC=1430 MHz, offset 10 kHz
fOSC=1430 MHz, offset 100 kHz
f = 480 MHz
f = 950 MHz
Min.
31.0
16
18
19
–10
–10
–11
5.5
Typ.
53.0
19
21
22
16
14
14
–6
–6
–7
8.5
45.0
74
95
1.2
140
5
Max.
75.0
23
25
26
19
16
16
11.0
–20
–20
–20
–20
–32
–32
Unit
mA
dB
dB
dB
dB
dB
dB
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dB
dBc/Hz
dBc/Hz
Ω
pF
spectrum analyzer, assuming input level of the reception frequency to be –25 dBm (when IC input pin is
converted for 50 Ω).
—4—
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