Sony CXA3555N Datasheet

All Band Tuner IC with On-chip PLL

Description

The CXA3555N is a monolithic TV tuner IC which integrates local oscillator and mixer circuits for VHF band, local oscillator and mixer circuits for UHF band, an IF amplifier and a tuning PLL onto a single chip, enabling further miniatur ization of the tuner.

Features

• Low power consumption (5V, 63mA typ.)

• Low noise figure, low distortion characteristics

• High gain/low gain selectable

• Supports IF double-tuned/adjacent channel trap

• Balanced oscillator circuits (3 sets) with excellent

oscillation stability

• On-chip PLL supports I2C bus

• On-chip high voltage drive transistor for charge

pump

• Frequency step selectable from 31.25, 50 or

62.5kHz (when using a 4MHz crystal)

• Low-phase noise synthesizer

• On-chip 4-output band switch (output voltage: 5V,

current capacity: 5mA)

• 30-pin SSOP small package

CXA3555N

30 pin SSOP (Plastic)

Absolute Maximum Ratings

• Supply voltage VCC –0.3 to +5.5 V

• Operating temperature Topr –25 to +75 °C

• Storage temperature Tstg –55 to +150 °C

• Allowable power dissipation

PD 580 mW

Operating Conditions

Supply voltage VCC 4.75 to 5.30 V

Applications

• TV tuners

• VCR tuners

• CATV tuners

Structure

Bipolar silicon monolithic IC

Note: This IC has pins whose electrostatic discharge strength is weak as the operating frequency is high

and the high-frequency process is used for this IC. Take care of handling the IC.

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 –

E01326-PS

Block Diagram and Pin Configuration

CXA3555N

SCL

SDA

BS1

BS2

IFIN1

IFIN2

Vcc

IF AMP

1

2

3

4

5

6

7

2

C BUS

I Interface

Shift Register

Band SW Driver

Programable Divider 14/15 bit

Divider 1/128, 160, 256

Phase Detector

Prescaler 1/2

REF OSC

Charge Pump

30

29

28

27

26

25

24

IFOUT

ADSW

BS3

REF OSC

CPO

VT

GND2

MIXOUT1

MIXOUT2

GND1

VHFIN

BYP

BS4

UHFIN1

UHFIN2

10

11 12

13 14

15

8

23

UOSCB2

9

22

UOSCE2

21

UOSCE1

UHFOSC

VHOSC

UHF/VHF

MIX

VLOSC

20

19

18

17

16

UOSCB1

VHOSC2

VLOSC2

VHOSC1

VLOSC1

– 2 –

Pin Description

CXA3555N

No.

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

Symbol

SCL SDA BS1 BS2 IFIN1 IFIN2 Vcc MIXOUT1 MIXOUT2 GND1 VHFIN BYP BS4 UHFIN1 UHFIN2 VLOSC1

Description

SCL input SDA I/O Band switch output 1 Band switch output 2 IF amplifier input IF amplifier input Power supply MIX output (open collector) MIX output (open collector) Analog circuit GND VHF input VHF input GND and gain switching (low: GND, high: open) Band switch output 4 UHF input UHF input

VHF Low-band oscillator 17 18 19 20 21 22 23 24 25 26 27 28 29 30

VHOSC1 VLOSC2 VHOSC2 UOSCB1 UOSCE1 UOSCE2 UOSCB2 GND2 VT CPO REFOSC BS3 ADSW IFOUT

VHF High-band oscillator

VHF Low-band oscillator

VHF High-band oscillator

UHF oscillator (base pin)

UHF oscillator (emitter pin)

UHF oscillator (base pin)

PLL circuit GND

Tuning voltage output (open collector)

Charge pump output (loop filter connection)

Crystal connection for PLL reference oscillator

Band switch output 3

Address selection (I2C bus)

IF amplifier output

– 3 –

Pin Description

CXA3555N

Pin No.

Symbol

1 SCL — Clock input

2SDA — Data input

Pin voltage

[V]

Equivalent circuit Description

7

40k

1

7

40k

2

5p

3 BS1

4 BS2

13 BS4

28 BS3

High: 4.9 Low: 0.0

7

3 4

13 28

70k

Band switch outputs. This pin corresponding to the

7

selected band goes High.

– 4 –

CXA3555N

Pin No.

5 IFIN1

Symbol

Pin voltage

[V]

Equivalent circuit Description

7

5

1.6k

6

IF inputs.

2.0

These pins must be connected to the mixer outputs via coupling capacitance.

6 IFIN2

7VCC — Power supply.

8

9

8 MIXOUT1

Mixer outputs. These pins output the signal in

—

open collector format, and they must be connected to the

9 MIXOUT2

power supply via a load.

10 GND1 — Analog circuit GND.

11 VHFIN

2.4 during VHF reception

0.0 during UHF reception

7

11

3k 3k

15p

150k

57k

VHF input. The input format is unbalanced input.

VHF input GND and gain switching.

12 BYP

VCC

(when open)

12

GND: low gain Open: high gain (However, when control byte GC is "0")

7

14 UHFIN1

15 UHFIN2

0.0 during VHF reception

2.3 during UHF reception

14 15

3k 3k

UHF inputs. Input a balanced signal to Pins 14 and 15, or ground either of Pin 14 or 15 with a capacitor and input the signal to the other pin.

– 5 –

CXA3555N

Pin No.

Symbol

16 VLOSC1

18 VLOSC2

17 VHOSC1

19 VHOSC2

Pin voltage

[V]

0.0

Equivalent circuit Description

16 18

7

3333

External resonance circuit connection for VL oscillator.

50k

17 19

7

2020

50k

External resonance circuit connection for VH oscillator.

50k

2.4 during

20 UOSCB1

21 UOSCE1

22 UOSCE2

23 UOSCB2

VHF reception

2.2 during UHF reception

2.0 during VHF reception

1.5 during UHF reception

2.0 during VHF reception

1.5 during UHF reception

2.4 during VHF reception

2.2 during UHF reception

23 22 21 20

3k

7

External resonance circuit connection for UHF oscillator.

24 GND2 — PLL circuit GND.

7

25 VT —

26

Varicap drive voltage output. This pin outputs the signal in open collector format, and it must be connected to the tuning power supply via a load.

25

70

26 CPO 2.0

Charge pump output. Connects the loop filter.

– 6 –

CXA3555N

Pin No.

Symbol

Pin voltage

[V]

27 REFOSC 4.4

29 ADSW

1.25

(when open)

27

Equivalent circuit Description

7

30k

25p

Crystal connection for reference oscillator.

38p

7

150k

29

Address selection. Controls address bits 1 and 2.

50k

5p

7

30 IFOUT 2.8 IF output.

30

– 7 –

Electrical Characteristics (See the Electrical Characteristics Measurement Circuit.) Circuit Current

(Vcc = 5V, IFVCC = 5V, Ta = 25°C)

CXA3555N

Item Symbol

Iccv

Circuit current

Iccu

OSC/MIX/IF Amplifier Block

Item Symbol

CG1 CG2 CG3 CG4

1

Conversion gain

∗

CG5 CG6 CG7 CG8 NF1 NF2 NF3

Noise figure

∗1, ∗

NF4

2

NF5 NF6 NF7 NF8

Measurement conditions

VCC current Band switch output open during VHF operation

VCC current Band switch output open during UHF operation

Measurement conditions VHF operation fRF = 55MHz High gain mode VHF operation fRF = 360MHz High gain mode UHF operation fRF = 360MHz High gain mode UHF operation fRF = 800MHz High gain mode VHF operation fRF = 55MHz Low gain mode VHF operation fRF = 360MHz Low gain mode UHF operation fRF = 360MHz Low gain mode UHF operation fRF = 800MHz Low gain mode VHF operation fRF = 55MHz High gain mode VHF operation fRF = 360MHz High gain mode UHF operation fRF = 360MHz High gain mode UHF operation fRF = 800MHz High gain mode VHF operation fRF = 55MHz Low gain mode VHF operation fRF = 360MHz Low gain mode UHF operation fRF = 360MHz Low gain mode UHF operation fRF = 800MHz Low gain mode

Min. Typ.

35

56

Min. Typ.

19.0

19.5

23.0

17.0

17.5

21.0

22.0

22.5

26.0

20.0

20.5

24.0

24.0 12 12 10 11 13 13 11 12

Max. Unit

78

mA

Max. Unit

25.0

25.5

29.0

23.0

23.5

27.0

27.0 15 15 13 14 16 16 14 15

dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB

1% cross modulation 1

∗1, ∗

Maximum output power

3

CM1

CM2

CM3

CM4

CM5

CM6

CM7

CM8 Pomax

VHF operation fD = 55MHz fUD = ±12MHz (30% AM) High gain mode

VHF operation fD = 360MHz fUD = ±12MHz (30% AM) High gain mode

UHF operation fD = 360MHz fUD = ±12MHz (30% AM) High gain mode

UHF operation fD = 800MHz fUD = ±12MHz (30% AM) High gain mode

VHF operation fD = 55MHz fUD = ±12MHz (30% AM) Low gain mode

VHF operation fD = 360MHz fUD = ±12MHz (30% AM) Low gain mode

UHF operation fD = 360MHz fUD = ±12 MHz (30% AM) Low gain mode

UHF operation fD = 800MHz fUD = ±12 MHz (30% AM) Low gain mode

50Ω load, saturation output

– 8 –

99

97

94

100

98

94

8

103

101

98

104

102

98 11

dBµ

dBm

CXA3555N

Item Symbol

Switch ON drift (PLL not

4

operating)

∗

Supply voltage drift (PLL not

4

operating)

∗

Oscillator phase noise

∆fsw1

∆fsw2

∆fsw3

∆fsw4

∆fst1

∆fst2

∆fst3

∆fst4

C/N1

C/N2

Measurement conditions

VHF operation fOSC = 100MHz ∆f from 3s to 3min after switch ON

VHF operation fOSC = 405MHz ∆f from 3s to 3min after switch ON

UHF operation fOSC = 405MHz ∆f from 3s to 3min after switch ON

UHF operation fOSC = 845MHz ∆f from 3s to 3min after switch ON

VHF operation fOSC = 100MHz ∆f when VCC 5V changes ±5%

VHF operation fOSC = 405MHz ∆f when VCC 5V changes ±5%

UHF operation fOSC = 405MHz ∆f when VCC 5V changes ±5%

UHF operation fOSC = 845MHz ∆f when VCC 5V changes ±5%

VHF operation 10kHz offset CP = 1 Phase comparison frequency = 31.25kHz

UHF operation 10kHz offset CP = 1 Phase comparison frequency = 31.25kHz

Min. Typ.

86

80

Max. Unit ±300

±600

±350

±400

±100

±450

±100

kHz

dBc/Hz

1

∗

Value measured with untuned input.

2

∗

NF meter direct-reading value (DSB measurement).

3

∗

Value with a desired reception signal input level of –30dBm, an interference signal of 100kHz/30% AM, and an interference signal level where S/I = 46dB measured with a spectrum analyzer.

4

∗

Value when the PLL is not operating.

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