Sony CXA2125Q Datasheet

Audio/Video Switch with Electronic Volume for 3 Scart

Description

The CXA2125Q is an I2C programmable audio, video
switch designed primarily for set top box applications. It
interfaces from digital encoder sources to TV, VCR and
auxiliary scart connectors.

Features

• 3 scart independent audio/video switching (TV, VCR,

AUX)

• 0 to –63dB volume control with click noise reduction

• 5 stereo audio inputs

• I2C control

• Scart Function Switching input and output

• Scart Fast Blanking for OSD

• Mono switchable to stereo on TV, VCR and AUX outputs

• On-chip +12V to +9V voltage regulator

• Logic output

• Selectable +6dB, +12dB gain on TV output

• RGB input on VCR scart

• Compatible with 2 scart Audio/Video switch CXA2126Q

Applications

Digital Set Top Box

Structure

Bipolar silicon monolithic IC

Absolute Maximum Ratings

• Supply voltage VCC 12 V

• Operating temperature Topr –20 to +75 °C

• Storage temperature Tstg –65 to +150 °C

• Allowable power dissipation

PD 850 mW

Operating Conditions

• Supply voltage 10.7 to 12 V

• Operating voltage 9 ± 0.5 V

– 1 –

E99338-PS

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.

CXA2125Q

64 pin QFP (Plastic)

– 2 –

CXA2125Q

Block Diagram

× 2

× 2

ROUT2

31

LOUT2

32

MONO SWITCH

× 2

× 2

ROUT1

34

LOUT1

36

8dB 1dB 0/6dB

MONO SWITCH

Selectable Gain Stage

MONO SWITCH

VOUT7

100Ω

× 2

× 2

× 2

× 2

× 2

× 2

FBLK_IN1DIG

Typical Connection

VCR
AUX

DIG BLUE
VCR BLUE
AUX BLUE

DIG GREEN/CVBS

VCR GREEN
AUX GREEN

DIG RED/CHROMA

DIG CHROMA
VCR RED/CHROMA
AUX RED/CHROMA

DIG CVBS/LUMA

DIG CVBS/LUMA
VCR CVBS/LUMA
AUX CVBS/LUMA

TV CVBS

DIG
VCR
AUX
TV
ANALOGUE SAT

DIG
VCR
AUX
TV
ANALOGUE SAT

ANALOGUE SAT CVBS

TV_FBLANK

+5V

0V

FBLK_IN2

FBLK_SW

100Ω

FBLK_IN3

VIN1
VIN2
VIN3

VIDEO_SWITCH1 (TV)

VIN4
VIN5
VIN6

VIN7
VIN8
VIN9

VIN10
VIN11

VIN12
VIN13
VIN14
VIN15
VIN16

VIDEO_SWITCH2 (VCR)

VIDEO_SWITCH3 (AUX)

AUDIO_SWITCH1 (TV)

VOLUME CONTROL

& MUTE

8dB

ZCD

1dB 0/6dB

52
53
51

63
61
13

2
59
15

4

6
57
17

8
10
55
21
23
25

VID_V

CC

VID_BIAS

VID_GND

60
62

7

Bias

Bias

4.5V

Mute

Bias 1

4.05V

AUD_VCC

DIG_VCC

AUD_BIAS
AUD_GND

DIG_GND

20
19
26

Bias 2

4.5V

VCC_12V

VREG_BASE

VREG_9V

58
56

38
43

54

RIN1

3

RIN2

12

RIN3

16

RIN4

22

RIN5

27

9V reg

–6dB
–6dB
–6dB
–6dB

LIN1

5

LIN2

14

LIN3

18

LIN4

24

LIN5

29

–6dB
–6dB

HW_MUTE

45

SDA

11

SCL

9

FNC_VCR

64

FNC_AUX

1

Monitor
Monitor

–6dB
–6dB

TV BLUE

TV GREEN

TV RED/C

TV CVBS/Y

VCR CHROMA

AUX CVBS

VCR CVBS/Y

Typical Connection

50

VOUT1

100Ω

48

× 2

VOUT2

100Ω

47

× 2

VOUT3

100Ω

46

× 2

VOUT4

100Ω

49

× 2

VOUT5

100Ω

41

× 2

VOUT6

100Ω

44

FNC_TV

30

LOGIC

28

× 2

39

MONO

33

PHONO_R

35

RTV

40

LTV

TV

42

PHONO_L

37

AUDIO_SWITCH2 (VCR)

AUDIO_SWITCH3 (AUX)

I

2

C

Interface

LOGIC

P.O.D

VCR

AUX

TV

VCR

AUX

3.3V or 5V

– 3 –

CXA2125Q

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

20

21

22

23

24

25

26

27

28

29

30

31

32

36373839404142434445464748495051

52
53
54
55
56
57
58
59
60
61
62
63
64

FBLK_IN1
FBLK_IN2
VREG_9V

VIN13

VREG_BASE

VIN9

V

CC_12V

VIN5

VID_V

CC

VIN2

VID_BIAS

VIN1

FNC_VCR

FNC_AUX

VIN4

RIN1

VIN7

LIN1

VIN8

VID_GND

VIN11

SCL

VIN12

SDA

RIN2

VIN3

LIN2

VIN6

RIN3

17 18 19

VIN10

LIN3

AUD_BIAS

FBLK_IN3

TV_FBLANK

VOUT4

VOUT1

VOUT2

VOUT3

HW_MUTE

VOUT6

DIG_GND

LTV

VOUT5

RTV

VOUT7

DIG_V

CC

PHONO_L

LOUT1

333435

PHONO_R

ROUT1

MONO

LOUT2
ROUT2
FNC_TV
LIN5
LOGIC
RIN5
AUD_GND
VIN16
LIN4
VIN15
RIN4
VIN14
AUD_V

CC

Pin Configuration

– 4 –

CXA2125Q

Pin Description

Pin

No.

Symbol

Pin
voltage

Equivalent circuit Description

63
61
13

2
59
15
55
23

4

6
57
17

8
10
21
25

V

CC = 12V VCC = 9V

14µA

120kΩ

147Ω

60µA

VIN1
VIN2
VIN3
VIN4
VIN5
VIN6
VIN7
VIN8
VIN9
VIN10
VIN11
VIN12
VIN13
VIN14
VIN15
VIN16

4.6V

Video signal inputs.
An input coupling
capacitor is required.
(typ = 0.47µF)

63
61
13

2
59
15

4

6
57
17

8
10
55
21
23
25

12
16
22
27

14
18
24
29

VCC = 12V

33kΩ

33kΩ

7µA

4.5V

RIN2
RIN3
RIN4
RIN5

LIN2
LIN3
LIN4
LIN5

4.5V

Audio signal inputs.
An input coupling
capacitor is required.
(typ = 2.2µF)

12
16
22
27

14
18
24
29

48
47
46
49
41
44
39

V

CC = 12V VCC = 9V

140µA

280µA

200Ω

100Ω

VOUT1
VOUT2
VOUT3
VOUT4
VOUT5
VOUT6
VOUT7

3.9V

Video signal outputs.

48
47
46
49
41
44
39

– 5 –

CXA2125Q

35
37
33
40
34

31
42
36
32

V

CC = 12V VCC = 9V

55Ω

20kΩ

22kΩ

20kΩ

33µA

33µA

RTV
ROUT1
ROUT2
LTV
LOUT1
LOUT2
PHONO_R
PHONO_L
MONO

4.5V

Audio signal outputs.
A coupling capacitor may
be used.
(typ = 10µF)

40
34
31
42
36
32
35
37
33

Pin
No.

Symbol

Pin
voltage

Equivalent circuit Description

62

V

CC = 12V VCC = 9V

14µA

11kΩ

9kΩ

200Ω

BIAS_
VIDEO

3.9V

Reference Bias for video
circuit.
Connected to GND with
capacitor.
(typ = 47µF)

62

7µA

19

V

CC = 12V VCC = 9V

20kΩ

20kΩ

BIAS_
AUDIO

4.5V

Reference Bias for audio
circuit.
Connected to GND with
capacitor.
(typ = 22µF)

19

30

V

CC = 12V

120Ω

3kΩ

15kΩ

FNC_TV

—

I2C controlled output
giving 0V, 6V or 12V.

30

– 6 –

CXA2125Q

Pin

No.

Symbol

Pin
voltage

Equivalent circuit Description

120µA

54

V

CC = 12V

77.7kΩ

13.5kΩ

VREG_9V

9V

Pin connected to emitter
of external regulator
transistor.

54

56

V

CC = 12V VCC = 12V

1mA

120µA

413Ω
15pF

VREG_
BASE

9.7V

Connection to base of
external regulator
transistor.
Max I = 1mA

56

9

VCC = 9V

40µA

4kΩ

10kΩ

40kΩ

SCL

—

I2C clock input.

9

11

VCC = 9V

40µA

4kΩ

4.5kΩ

40kΩ

SDA

—

I2C data input/output.

11

– 7 –

CXA2125Q

Pin

No.

Symbol

Pin
voltage

Equivalent circuit Description

VCC = 12V

45

147Ω

28kΩ

72kΩ

HW_MUTE

—

HW MUTE: This pin is
active high > 2.5V < 9V.
When high, all audio
muted.

45

28

V

CC = 12V VCC = 9V

8µA

7.5kΩ

3V

4.5kΩ

40kΩ

LOGIC

—

Open collector logic pins.

28

50

V

CC = 12V VCC = 9V

100µA

100µA

100Ω

100Ω

FBLK_
OUT

—

Fast Blank output set by
I2C to input FBLK_IN1,
FBLK_IN2, or FBLK_IN3.

High = 5.3V

Low = 1.2V
Connected to external
emitter follower.

50

52
53
51

V

CC = 12V

VCC = 9V

147Ω

90µA

50µA

FBLK_IN1
FBLK_IN2
FBLK_IN3

—

Fast Blank inputs.

Low = < 0.4V
High = > 1.0V, < 3.0V

52
53
51

– 8 –

CXA2125Q

Pin

No.

Symbol

Pin
voltage

Equivalent circuit Description

80µA

64

1

12.5kΩ 12.5kΩ

10kΩ

25kΩ

VCC = 9V

FNC_VCR
FNC_AUX

—

Function switching input.
(Scart pin 8)

64

1

3
5

V

CC = 12V

33kΩ

7µA

4.5V

RIN1
LIN1

4.5V

Audio signal inputs.
A coupling capacitor is
required for these inputs.
(typ = 2.2µF)

3
5

– 9 –

CXA2125Q

Electrical Characteristics

Nominal conditions (Ta = 25°C)

VCC_12V = 12V, No signal, no load

Current consumption ICC 30 50 80 mA

Item Symbol Conditions Min. Typ. Max. Unit

Video system Nominal conditions (Ta = 25°C, Vcc_12V = 12V, VREG_9V = 9V)

Input pin voltage
Output pin voltage – with

output on.
Output pin voltage – with

output off.
Gain

Bandwidth

Input dynamic range
Output dynamic range
Cross talk

S/N ratio

Input impedance

Non-linearity

Differential gain

Differential phase

Sync crush

VVPin
VVPout1

VVPout2
GVv

fV3dB

VDRVI
VDRVO
Vctv

S/NV

ZinV

Lin

DG

DP

SC

4.3

3.6

—

5.5

15

2.5

5.0
—

—

94

–3

–3

–3

–2

4.6

3.9

0

6.0

20

—
—
—

72

120

–0.4

1.5

1

0

4.9

4.2

0.2

6.5

—

—
—

–50

—

175

3

2

2

2

V
V

V

dB

MHz

Vp-p
Vp-p

dB

dB

kΩ

%

%

Deg

%

Item Symbol Conditions Min. Typ. Max. Unit

V2

V1 × 2

No signal, no load (Fig.1)
No signal, no load (Fig.1)

No signal, no load (Fig.1)
f = 200kHz, 0.3Vp-p input (Fig.2)

0.3Vp-p input, frequency where output
level is –3dB with 200kHz serving as
0dB (Fig. 2)

200kHz input (Fig.2)
200kHz, 2.5Vp-p input (Fig.2)
f = 4.43MHz, 1Vp-p input (Fig.2)
Ratio of 0.7Vp-p white video signal to

"black line" noise. Weighted using CCIR

567. HPF @5kHz, LPF @5MHz. (Fig.2)
1Vrms 1kHz input through 56kΩ.

Attenuation measured to calculate ZinV
(Fig.3)

(Fig.4)

V1 = Pin voltage +0.5V,
V2 = Pin voltage +1V

At output, non-linearity = –1 × 100

1.7Vp-p 5-step modulated staircase.
(Chroma and Burst are 150mVp-p

4.43MHz) (Fig.2)
as above. (Fig.2)
Percentage reduction in sync pulse

(0.4Vp-p), with tip at –1.2V input offset.
(Fig.4)

V2

V1

Input Pin V

Plus

– 10 –

CXA2125Q

Audio system

Unless otherwise stated: input coupling capacitor 1µF; output coupling capacitor of 10µF; load of 10kΩ.

Nominal conditions (Ta = 25°C, Vcc_12V = 12V, VREG_9V = 9V)

No signal, no load (Fig. 5)

f = 1kHz, 0.5Vrms input.
TV output amplifier set to 0dB (Fig. 6)

f = 1kHz, 0.5Vrms input.
TV output amplifier set to +6dB (Fig. 6)

f = 1kHz, 1Vrms input. (Fig. 6)
f = 1kHz, 0.5Vrms stereo input.

TV output amplifier set to 0dB (Fig. 6)
f = 1kHz, 0.5Vrms stereo input.

TV output amplifier set to +6dB (Fig. 6)
f = 1kHz, 0.5Vrms stereo input. (Fig. 6)
f = 1kHz, 1Vrms input.

TV output amplifier set to 0dB (Fig. 6)
f = 1kHz, 1Vrms input.

TV output amplifier set to +6dB (Fig. 6)
f = 1kHz, 1Vrms stereo input.

TV output amplifier set to 0dB (Fig. 6)
f = 1kHz, 1Vrms stereo input.

TV output amplifier set to +6dB (Fig. 6)
f = 1kHz, 1Vrms input. (Fig. 6)

f = 1kHz, 1Vrms stereo input. (Fig. 6)

0.3Vp-p input. Output level at 30kHz
with 1kHz serving as 0dB. (Fig. 7)

0.3Vp-p input; frequency where output
level is –3dB with 1kHz serving as 0dB.
No load (Fig. 7)

f = 1kHz, 0.5Vrms, unweighted response;
LPF @400Hz, HPF @80kHz. (Fig. 6)

f = 1kHz (Fig. 6)

f = 1kHz (Fig. 6)
f = 1kHz, 1Vrms input on one input,

measure on any other audio output.
(Fig.6)

Input/output pin voltage

Audio frequency response

Frequency B/W

Distortion
Input dynamic range

RIN2, 3, 4, 5 LIN2, 3, 4, 5
Input dynamic range

RIN1 LIN1
Cross talk

(Channel separation)

VAPIN

GVA1

GVA2
GVA3
GVA4

GVA5

GVA6

GVA7

GVA8

GVA9

GVA10

GVA11

GVA12

FAF

FBWA1

THD

VdA1

VdA2

VctA

4.2

5.5

11
—
—

—

—

–0.5

5.5

–0.7

5

–0.5

–0.7

–0.3

—

—

2

1

—

4.5

6

12

6
6

12

6

0

6

0

6

0

0

0

1

0.003

—

—

—

4.8

6.5

13
—
—

—

—

+0.5

6.5

+0.3

7

+0.5

+0.3

+0.3

—

0.2

—

—

–76

V

dB

dB
dB
dB

dB

dB

dB

dB

dB

dB

dB

dB

dB

MHz

%

Vrms

Vrms

dB

Item Symbol Conditions Min. Typ. Max.

Unit

Output

TV/Phono

TV/Phono
VCR/AUX
TV mono

TV mono
VCR mono

AUX mono
TV/Phono

TV/Phono

TV mono

TV mono

VCR/AUX
VCR mono

AUX mono

Gain Input
RIN1/LIN1

RIN1/LIN1
RIN1/LIN1
RIN1 + LIN1

RIN1 + LIN1

RIN1 + LIN1
RIN2, 3, 4, 5

LIN2, 3, 4, 5
RIN2, 3, 4, 5

LIN2, 3, 4, 5
RIN2, 3, 4, 5

+ LIN2, 3, 4, 5
RIN2, 3, 4, 5

+ LIN2, 3, 4, 5
RIN2, 3, 4, 5

LIN2, 3, 4, 5
RIN2, 3, 4, 5

+ LIN2, 3, 4, 5

– 11 –

CXA2125Q

Offset voltage between input and
output (Fig. 5)

(excluding any external series resistor)

(excluding any external series resistor)
(excluding any external series resistor)

f = 1kHz, 1Vrms input to two channels.
Phase difference of stereo output
measured

f = 1kHz, 1Vrms input (at maximum
volume).
HPF @20Hz, LPF@20kHz. (Fig. 6)

f = 1kHz, 0.5Vrms input. Set by I2C.
(Fig.6)

f = 1kHz, 0.5Vrms input. Set by I2C.
(Fig.6)

f = 1kHz, 1Vrms input. (Fig.6)
Offset voltage between any audio input

and RTV, LTV outputs. (Fig.5)

DC offset
Input impedance

RIN2, 3, 4, 5 LIN2, 3, 4, 5
Input impedance

RIN1/LIN1
Output impedance

Phase difference

S/N ratio

Electronic Volume Control

Fine volume attenuation
step

Coarse volume attenuation
step

Mute
DC Offset -RTV, LTV

Voff

Zin1

Zin2
Zout

Vpda

S/NA

AEVC

AEVF
Amute
VoffTV

–30

—

—
—

—

80

0.6

7.5
—

–30

—

66

33
10

0.05

90

1

8

—

0

+30

—

—
—

—

—

1.4

8.5
–80
+30

mV

kΩ

kΩ

Ω

Deg

dB

dB

dB
dB

mV

Item Symbol Conditions Min. Typ. Max. Unit