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

Pin

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 (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

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

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

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

35

56

56

Min. Typ.

19.0

19.5

23.0

23.0

17.0

17.5

21.0

21.0

22.0

22.5

26.0

26.0

20.0

20.5

24.0

24.0
12
12
10
11
13
13
11
12

Max. Unit

78

78

mA

mA

Max. Unit

25.0

25.5

29.0

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

99

97

94

100

100

98

94

8

103

103

101

98

104

104

102

98
11

dBµ

dBµ

dBµ

dBµ

dBµ

dBµ

dBµ

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

±100

kHz

kHz

kHz

kHz

kHz

kHz

kHz

kHz

dBc/Hz

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.

– 9 –