CXA3068N
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.
I
CC
=53 mA (typ.)
•
16-pin SSOP package contributes to reduction in
set size.
Applications
•
Satellite broadcasting tuners for BS, CS, DSS and
DVB. (Frequency conversion to the second IF)
Structure
Bipolar silicon monolithic IC
OSCOUT1
16 pin SSOP (Plastic)
Absolute Maximum Ratings
(Ta=25 °C)
•
Supply voltage
V
CC
–0.3 to +5.5
V
•
Storage temperature
Tstg –55 to +150 °C
•
Allowable power dissipation
P
D
625
mW
(When mounted on board)
Operating Conditions
•
Supply voltage
•
Ambient temperature
V
CC
Topr
4.75 to 5.3 V
–20 to 75 °C
Block Diagram and Pin Configuration
OSCB1
OSCB2
GND1
VCC1
NC
NC
GND1
10
16
15
14
13
12
11
9
OSC
BUFF
IF AMP
MIX
1
IFOUT
2
VCC2
3
GND2
4
GND2
5
RFIN1
6
RFIN2
7
GND1
8
OSCOUT2
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.
—1—
E95Z07-TE
CXA3068N
Pin Description and Equivalent Circuit
Pin
No.
Symbol
Typical pin
voltage (V)
Equivalent circuit
VCC2
Description
2
1
IF OUT
2.5
1
IF output.
2
3
4
VCC2
GND2
GND2
5.0
0
0
IF block power supply.
IF block GND.
IF block GND.
5
RF IN1
1.8
5
2k
2k
6
RF input.
Normally, a decoupling capacitor
is connected at Pin 5 to GND and
Pin 6 is used for input.
6
RF IN2
1.8
7
GND1
0
VCC1
RF block GND.
16
8
OSC OUT2
3.5
9
40
40
Local oscillation output.
8
9
OSC OUT1
3.5
—2—
CXA3068N
Electrical Characteristics
(Ta=25 °C, V
CC
=5 V, refer to the Electrical Characteristics Measurement Circuit.)
Input frequency: 950 to 2150 MHz
No
Item
1 Current consumption
2 Conversion gain
∗
1
Symbol
I
CC
CG1
CG2
CG3
NF1
NF2
NF3
P
OSC
1
P
OSC
2
P
OSC
3
P
O
(sat)
RFLK1
RFLK2
RFLK3
Measurement conditions
No signal
fin = 950 MHz, f
IF
= 480 MHz
fin = 1450 MHz, f
IF
= 480 MHz
fin = 2150 MHz, f
IF
= 480 MHz
fin = 950 MHz, f
IF
= 480 MHz
fin = 1450 MHz, f
IF
= 480 MHz
fin = 2150 MHz, f
IF
= 480 MHz
f
OSC
= 1430 to 1830 MHz
f
OSC
= 1830 to 2230 MHz
f
OSC
= 2230 to 2630 MHz
f
IF
= 480 MHz
Min. Typ. Max.
31.0 53.0 75.0
16
19
23
18
21
25
19
22
26
16
19
14
16
14
16
–10
–10
–11
5.5
–6
–6
–7
8.5
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
3 Noise figure
∗
1, 2
4 Local oscillation output
5 IF maximum output
6
RF pin local oscillation
leakage
IF pin local oscillation
7
leakage
Third-order
intermodulation
distortion
∗
1, 3
8
Local oscillation phase
noise
10 IF output VSWR
9
11 RF input impedance
f
OSC
= 1430 to 1830 MHz
f
OSC
= 1830 to 2230 MHz
f
OSC
= 2230 to 2630 MHz
IFLK1 f
OSC
= 1430 to 1830 MHz
IFLK2 f
OSC
= 1830 to 2230 MHz
IFLK3 f
OSC
= 2230 to 2630 MHz
Pin = –25 dBm
fin = 950 MHz + 960 MHz
IM3
fout = 470 MHz + 480 MHz
S/I of 460 MHz and 480 MHz
f
OSC
=1430 MHz, offset 10 kHz
CN1
f
OSC
=1430 MHz, offset 100 kHz
CN2
IFVSWR f = 480 MHz
f = 950 MHz
rπ
Cπ
45.0
dB
74
95
1.2
140
5
dBc/Hz
dBc/Hz
Ω
pF
∗
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
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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