Datasheet CXA3068N Datasheet (Sony)

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—

LOout

CXA3068N

1n

20k

1T379

1T379

10k

10k

47p

47p

1013 12 91116 15 14

NC

NC

GND1

OSCB2

OSCB1

GND1

OSCOUT2

CXA3068N

OSCOUT1

GND1

RFIN2

RFIN1

GND2

GND2

VCC2

2 61 87543

1n

100p

RFin

100p

1n

6P

1n

VC

+5V

Electrical Characteristics Measurement Circuit

VCC1

—5—

1n

IF OUT

IFout

Description of Operation (Refer to the Electrical Characteristics Measurement Circuit.)

1) Oscillator circuit
The oscillator circuit is formed with two Colpitts oscillators, and oscillation is provided at the differential
input via an LC resonance circuit including a varicap diode. This is oscillated only by attaching an LC
resonance circuit externally because feedback capacitance, etc. are built in for oscillation.

2) Mixer circuit
This is a double-balance mixer having small leak of local oscillation signal. The RF signal is input to Pins
5 and 6. In normal use, the signal is input to one pin while the other pin is connected to GND via
decoupling capacitor.

3) IF amplifier circuit
The mixer output signal is amplified by the IF amplifier and output to Pin 1. The IF output is emitter­follower output and output impedance is approximately 50 Ω (480 MHz).

4) PLL oscillation signal output circuit
The output circuit is built in to drive the PLL for tuning. This is emitter-follower output and output
impedance is approximately 50 Ω.

CXA3068N

—6—

CXA3068N

Current consumption vs. Supply voltage

60

55

50

Current consumption [mA]

45

Supply voltage [V]

Conversion gain vs. Reception frequency (untuned input)

25

fIF = 480MHz

20

15

Conversion gain

10

5.35.04.7

0.8 1.2 1.4 1.8 2.2
Reception frequency [GHz]

2.01.61.0

Noise figure vs. Reception frequency (untuned input, in DSB)

24

fIF = 480MHz

20

16

Noise figure [dB]

12

2.01.61.00.8 1.2 1.4 1.8 2.2

Reception frequency [GHz]

Local oscillation output level vs. Local oscillation frequency

+5

0

–5

–10

Local oscillation output level [dBm]

2.62.21.61.4 1.8 2.0 2.4 2.8

Local oscillation frequency [GHz]

—7—

CXA3068N

IF pin local oscillation leak vs. Local oscillation frequency

–20

–30

–40

–50

–60

IF pin local oscillation leak [dBm]

1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8
Local oscillation frequency [GHz]

Input/output characteristics (untuned input)

+10

0

RF pin oscillation frequency leak vs. Local oscillation frequency

–20

–30

–40

–50

–60

RF pin oscillation frequency leak [dBm]

Local oscillation frequency [GHz]

= Fundamental-frequency (480MHz)
= Third-harmonics (470MHz)

–10

–20

–30

–50

IF output level [dBm]

–40

–60

–70

–50 –40 –30 –20 –10 0

RF input level [dBm]
(935MHz, 940MHz)

—8—

Input Impedance

CXA3068N

j10

0

–j10

1450MHz

j25

–j25

j50

50

2150MHz

–j100

j100

j150

–j150

j250

–j250

5 6

7

8

950MHz

–j50

S11

—9—

Output Impedance (IF)

CXA3068N

480MHz

j10

0

–j10

j25

–j25

50

–j50

j50

400MHz

j100

j150

j250

–j250

–j150

2 31

–j100

S11

Output Impedance (local oscillation output)

j50

j25

2630MHz

j10

0

–j10

–j25

50

–j100

j100

j150

–j150

j250

–j250

6 87

1011

9

–j50

1430MHZ

—10—

S11

Package Outline Unit : mm

CXA3068N

16PIN SSOP (PLASTIC)

+ 0.1

0.22 – 0.05

16

1

∗5.0 ± 0.1

9

8

0.65 ± 0.12

∗4.4 ± 0.1

0.1 ± 0.1

0.5 ± 0.2

A

+ 0.05

0.15 – 0.02

+ 0.2

1.25 – 0.1

0.1

6.4 ± 0.2

0° to 10°

DETAIL A

NOTE: Dimension “∗” does not include mold protrusion.

SONY CODE
EIAJ CODE
JEDEC CODE

SSOP-16P-L01
SSOP016-P-0044

PACKAGE STRUCTURE

PACKAGE MATERIAL
LEAD TREATMENT
LEAD MATERIAL

PACKAGE WEIGHT

EPOXY RESIN
SOLDER / PALLADIUM

COPPER / 42 ALLOY

0.1g

PLATING

—11—