CXA2174S

US Audio Multiplexing Decoder

Description

The CXA2174S is an IC designed as a decoder for

the Zenith TV Multi-channel System and also
corresponds with I

C BUS. Functions include stereo

demodulation, SAP (Separate Audio Program)
demodulation,

dbx noise reduction and sound

processor. Various kinds of filters are built-in this IC.
Adjustment, mode control and sound processor
control are all executed through I

C BUS.

Features
· Alignment-free VCO and filter
· Audio multiplexing decoder

dbx noise reduction decoder
sound processor
-- One external input
-- Volume control
are all included in a single chip. Almost any sort of
signal processing is possible through this IC.

· Input level, separation adjustments and each mode

control are possible through I

C bus.

Applications

TV, VCR and other decoding systems for US audio
multiplexing TV broadcasting

Structure

Bipolar silicon monolithic IC

Absolute Maximum Ratings (Ta = 25°C)
· Supply voltage

· Operating temperature

Topr

20 to +75

°C

· Storage temperature

Tstg

65 to +150 °C

· Allowable power dissipation

1.35

Range of Operating Supply Voltage

9 ± 0.5

A license of the dbx-TV noise reduction system is
required for the use of this device.

E00815-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.

30 pin SDIP (Plastic)

LSOUT-R

LSOUT-L

SDA

SCL

DGND

MAININ

MAINOUT

PCINT1

PCINT2

PLINT

COMPIN

VGR

IREF

GND

SAPTC

AUX-L

AUX-R

VCAWGT

VCATC

VCAIN

VEOUT

VETC

VEWGT

SAPIN

SAPOUT

NOISETC

STIN

SUBOUT

Pin Configuration (Top View)

CXA2174S

Block Diagram

VGR

IREF

DGND

SCL

SDA

SAPOUT

SAPIN

STIN

VEWGT

VETC

VEOUT

VCAIN

VCAWGT

VCATC

MAININ

MAINOUT

SUBOUT

PLINT

PCINT1

COMPIN

GND

NOISETC

SAPTC

IREF

LPF

HPF

RMSDET

VCA

DeEm

LOGIC

VCA

LPF

1/2

1/4

VCO

LFLT

STLPF

VCA

LPF

BPF

SAPVCO

LPF

NOISE

DET

SAPIND

"PONRES"

STIND

"SAP"

"NOISE"

NRSW/FOMO/SAPC

WIDEBAND

SPECTRAL

"STEREO"

DeEm

FLT

AMP

(+4dB)

C BUS I/F

(+6dB)

PCINT2

ATT

TVSW

MATRIX

VOL-R

VOL-L

LSOUT-L

LSOUT-R

AUX-L

AUX-R

EXTI/MI

VOL-R

VOL-L

CXA2174S

COMPIN

VGR

IREF

4.0V

1.3V

Audio multiplexing signal
input pin.

Band gap reference output
pin.
(Connect a 10µF capacitor
between this pin and GND.)

Set the filter and VCO
reference current. The
reference current is adjusted
with the BUS DATA based on
the current which flows to this
pin.
(Connect a 62k

(±1%)

resistor between this pin and
GND.)

24k

34k

14k

147

24k

40k

30k

30p 1.8k

16k

6.3k

147

30k

15k

30k

11k

9.7k

19.4k

2.06k

147

11k

Pin
No.

Symbol

Pin
voltage

Equivalent circuit

Description

PLINT

5.1V

Pilot cancel circuit loop filter
integrating pin.
(Connect a 1µF capacitor
between this pin and GND.)

147

20k

26µ

20k

10k

20k

50µ

20k

CXA2174S

SUBOUT

STIN

4.0V

Supply voltage pin.

(LR) signal output pin.

Input the (L-R) signal from
SUBOUT (Pin 17).

SAPIN

4.0V

Input the (SAP) signal from
SAPOUT (Pin 20).

147

580

14.4k

580

10P

Vcc

23k

147

18k

20k

11.7k

23k

147

18k

Pin
No.

Symbol

Pin
voltage

Equivalent circuit

Description

Set the time constant for the
SAP carrier detection circuit.
(Connect a 4.7µF capacitor
between this pin and GND.)

SAPTC

4.5V

10k

50µ

GND

Analog block GND.

CXA2174S

NOISETC

3.0V

Set the time constant for the
noise detection circuit.
(Connect a 4.7µF capacitor
between this pin and GND.)

3.3k

Vcc

10k

Vcc

200k

SAPOUT

4.0V

SAP FM detector output pin.

Variable de-emphasis
integrating pin.
(Connect a 2700pF capacitor
and a 3.3k

resistor in series

between this pin and GND.)

VEWGT

4.0V

Weight the variable
de-emphasis control effective
value detection circuit.
(Connect a 0.047µF capacitor
and a 3k

resistor in series

between this pin and GND.)

24k

10µ

580

Vcc

580

50µ

10k

147

Vcc

36k

2.9V

580

147

580

30k

8µ

50µ

7.5k

147

Pin
No.

Symbol

Pin
voltage

Equivalent circuit

Description

CXA2174S

VEOUT

VCAIN

4.0V

Variable de-emphasis output
pin.
(Connect a 4.7µF non-polar
capacitor between Pins 25
and 26.)

VCA input pin.
Input the variable
de-emphasis output signal
from Pin 25 via a coupling
capacitor.

VCATC

1.7V

Determine the restoration
time constant of the VCA
control effective value
detection circuit.
(the specified restoration
time constant can be
obtained by connecting a
10µF capacitor between this
pin and GND.)

Vcc

10k

580

50µ

20k

7.5µ

20k

47k

Pin
No.

Symbol

Pin
voltage

Equivalent circuit

Description

VETC

1.7V

Determine the restoration
time constant of the variable
de-rmphasis control effective
value detection circuit.
(the specified restoration time
constant can be obtained by
connecting a 3.3µF capacitor
between this pin and GND.)

20k

7.5µ

50µ

Vcc

CXA2174S

Electrical Characteristics

COMPIN input level

(100% modulation level)

(Ta = 25

°
C, Vcc = 9V)

Current consumption

Main output level

Main de-emphasis

frequency response

Main LPF frequency

response

Main distortion

Main overload distortion

Main S/N

Sub output level

Sub LPF frequency

response

Sub distortion

Sub overload distortion

Sub S/N

Crosstalk

Stereo

SAP

Cross talk

SAP

Stereo

Icc

Vmain

FCdeem

FCmain

THDm

THDmmax

SNmain

Vsub

FCsub

THDsub

THDsmax

SNsub

CTst

CTsap

MONO

SAP

440

1.2

3.0

150

3.0

490

1.0

0.1

0.15

190

0.5

0.1

0.2

540

1.0

0.5

230

1.0

2.0

mVrms

No signal

Mono 1kHz 100% mod.

Pre-em. ON

Mono 5kHz 30% mod.

Pre-em. ON

Mono 12kHz 30% mod.

Pre-em. ON

Mono 1kHz 100% mod.

Pre-em. ON

Mono 1kHz 200% mod.

Pre-em. ON

Mono 1kHz,

Pre-em. ON

SUB (L-R) 1kHz,

100% mod., NR OFF

SUB (L-R) 12kHz,

30% mod., NR OFF

SUB (L-R) 1kHz,

100% mod., NR OFF

SUB (L-R) 1kHz,

200% mod., NR OFF

SUB (L-R) 1kHz,

NR OFF

ST-L (R) 1kHz,

100% mod., NR ON,

SAP Carrier (5f

)

SAP 1kHz 100% mod.

NR ON, PILOT (f

)

20 log

('5k'/'1k')

20 log

('12k'/'1k')

20 log

('100%'/'0%')

20 log

('12k'/'1k')

20 log

('100%'/'0%')

20 log

('NRSW = 0'/

'NRSW = 1')

20 log ('NRSW

= 1'/'NRSW = 0')

15kLPF

1kBPF

1/2

Main (L + R) (Pre-Emphasis: OFF) = 245mVrms

SUB (L

R) (dbx-TV: OFF) = 490mVrms

Pilot = 49mVrms

SAP Carrier = 147mVrms

= 15.734kHz

Item

Symbol

Mode

Input pin

Input signal

Measurement

conditions

Filter

Output pin

Min.

Typ.

Max.

Unit

No.

CXA2174S

(Ta = 25

°
C, Vcc = 9V)

Stereo ON level

Stereo ON/OFF

hysteresis

SAP output level

SAP LPF frequency

response

SAP distortion

SAP S/N

SAP ON level

SAP ON/OFF hysteresis

ST separation 1 L

ST separation 1 R

ST separation 2 L

ST separation 2 R

LSOUT output level

LSOUT mute attenuation

LSOUT distortion

LSOUT overload

distortion

LSOUT S/N

LSOUT volume

maximum attenuation

THst

HYst

Vsap

FCsap

THDsap

SNsap

THsap

HYsap

STLsep1

STRsep1

STLsep2

STRsep2

Vls

MUls

THDls

THDlsmax

SNls

VOLmin

SAP

EXT

30/29

9.0

2.0

130

3.0

12.0

2.0

440

6.0

160

2.5

9.0

4.0

490

0.01

0.03

3.0

10.0

190

2.5

6.0

6.5

6.0

540

0.3

mVrms

Change

PILOT (f

) Level

SAP 1kHz 100% mod.

NR OFF

SAP 10kHz 30% mod.

NR OFF

SAP 1kHz 100% mod.

NR OFF

SAP 1kHz, NR OFF

Change

SAP Carrier (5f

)

Level

ST-L 300Hz 30% mod.

NR ON

ST-R 300Hz 30% mod.

NR ON

ST-L 3kHz 30% mod.

NR ON

ST-R 3kHz 30% mod.

NR ON

Sine wave 1kHz

490mVrms

Sine wave 1kHz

490mVrms

Sine wave 1kHz

490mVrms

Sine wave 1kHz

2Vrms

Sine wave 1kHz

490mVrms

Sine wave 1kHz

490mVrms

0dB = 49mVrms

20 log ('on level

'/'off level')

20 log

('10k'/'1k')

20 log

('100%'/'0%')

0dB = 147mVrms

20 log ('on level'

/'off level')

EXT1 = '1'

M1 = '0'

EXT1 = '1'

VOL-L = '0'

VOL-R = '0'

15kLPF

1kBPF

15kLPF

1kBPF

BUS

RETURN

BUS

RETURN

1/2

Item

Symbol

Mode

Input pin

Input signal

Measurement

conditions

Filter

Output pin

Min.

Typ.

Max.

Unit

No.

CXA2174S

GND

62k

METAL

± 1

SIGNAL

GENERATOR

C10

5600p

1MEG

100k

C11

0.012µ

4.7µ

DGND

C BUS DATA

220

LSOUT-R

LSOUT-L

SDA

SCL

DGND

MAININ

MAINOUT

PCINT1

PCINT2

PLINT

COMPIN

VGR

IREF

GND

SAPTC

AUX-L

AUX-R

VCAWGT

VCATC

VCAIN

VEOUT

VETC

VEWGT

SAPIN

SAPOUT

NOISETC

STIN

SUBOUT

4.7µ

C15

4.7µ

C16

10µ

C13

1µ

C19

4.7µ

C20

100µ

C14

4.7µ

C18

4.7µ

C17

4.7µ

C12

2700P

3.3k

0.047µ

3.3µ

TANTALUM

1µ

3.9k

10µ

4.7µ

TANTALUM

4.7µ

BUFF

FILTERS

15kHz LPF

BPF

1kHz BPF

MEASURES

SIGNAL

GENERATOR

SIGNAL

GENERATOR

Electrical Characteristics Measurement Circuit

CXA2174S

Adjustment Method

1. ATT adjustment

1) TEST BIT is set to "TEST1 = 0" and "TEST-DA = 0".

2) Input a 100Hz, 245mVrms sine wave signal to COMPIN and monitor the LSOUT-L output level. Then,

adjust the "ATT" data for ATT adjustment so that the LSOUT-L output goes to the standard value

(490mVrms).

3) Adjustment range: ±20%

Adjustment bits:

4 bits

2. Separation adjustment

1) TEST BIT is set to "TEST1 = 0" and "TEST-DA = 0".

2) Set the unit to stereo mode and input the left channel only signal (modulation factor 30%, frequency 300Hz

NR-ON) to COMPIN. At this time, adjust the "WIDEBAND" adjustment data to reduce LSOUT-R output to

the minimum.

3) Next, set the frequency only of the input signal to 3kHz and adjust the "SPECTRAL" adjustment data to

reduce LSOUT-R output to the minimum.

4) The adjustments in 2 and 3 above are performed to optimize the separation.

5) "WIDEBAND"

"SPECTRAL"

Adjustment range: ±30%

Adjustment range: ±15%

Adjustment bits:

6 bits

Adjustment bits:

6 bits

Adjust this IC through Tuner and IF when this IC is mounted in the set.

CXA2174S

SPECTRAL

WIDEBAND

0000

0001

0010

0011

0100

0101

SLAVE RECEIVER

84H (1000 0100)

SLAVE TRANSMITTER

85H (1000 0101)

Register Specifications

Slave address

Register table

Status Registers

DATA

SUB ADDRESS

MSB

LSB

BIT7

BIT6

BIT5

BIT4

BIT3

BIT2

BIT1

BIT0

TEST-DA

EXT1

TEST1

NRSW

VOL-L

VOL-R

FOMO

SAPC

STA1

BIT7

POWER

ON RESET

STA2

BIT6

STEREO

STA3

BIT5

SAP

STA4

BIT4

NOISE

STA5

BIT3

STA6

BIT2

STA7

BIT1

STA8

BIT0

ATT

: don't care

Note) The micro computer reads both SAP and NOISE status and judges SAP discrimination.

CXA2174S

Description of Registers

Control registers

ATT

SPECTRAL

WIDEBAND

TEST-DA

TEST1

EXT1

NRSW

FOMO

SAPC

VOL-L

VOL-R

Input level adjustment

Adjustment of stereo separation (3kHz)

Adjustment of stereo separation (300Hz)

DAC test mode

Test mode

Selection of TV mode or external input mode

Selection of the output signal (Stereo mode, SAP mode)

Forced MONO
(Left channel only is MONO during SAP output.)

Selection of LSOUT mute function ON/OFF
(0: mute ON, 1: mute OFF)

Selection SAP mode or L + R mode according to the
presence of SAP brodecasting

Left channel volume control

Right channel volume control

Contents

Number
of bits

Classifi-
cation

Standard
setting

Classification U: User control

A: Adjustment

S: Proper to set

T: Test

Status registers

PONRES

STEREO

SAP

NOISE

POWER ON RESET detection;

1: RESET

Stereo discrimination of the COMPIN input signal;

1: Stereo

SAP discrimination of the COMPIN input signal;

1: SAP

Noise level discrimination of the SAP signal;

1: Noise

Number of bits

Contents

CXA2174S

Description of Control Registers

ATT

(4):

Perform input level adjustment.

0 = Level min.

F = Level max.

SPECTRAL

(6):

Perform high frequency (fs = 3kHz) separation adjustment.

0 = Level max.

3F = Level min.

WIDEBAND

(6):

Perform low frequency (fs = 300Hz) separation adjustment.

0 = Level min.

3F = Level max.

TEST-DA

(1):

Set DAC output test mode.

0 = Normal mode

1 = DAC output test mode

In addition, the following output are present at Pin 2.

LSOUT-L (Pin 2): DA control DC level

TEST1

(1):

Monitor SAPBPF and NRBPF output

0 = Normal mode

1 = SAPBPF, NRBPF output

In addition, the following outputs are present at Pins 1 and 2.

LSOUT-L (Pin 2): SAP BPF OUT

LSOUT-R (Pin 1): NR BPF OUT

EXT1

(1):

Select TV mode or external input mode

0 = TV mode

1 = External input mode

NRSW

(1):

Select stereo mode or SAP mode

0 = Stereo mode

1 = SAP mode

FOMO

(1):

Select forced MONO mode

0 = Normal mode

1 = Forced MONO mode

(1):

Mute the LSOUT-L and LSOUT-R output.

0 = Mute ON

1 = Mute OFF

CXA2174S

Description of Mode Control

NRSW

FOMO

SAPC

"Select dbx input and TV decoder output"

Conditions: FOMO = 0

NRSW = 0 (MONO or ST output)
· During ST input:

left channel: L,
right channel: R

· During other input: left channel: L + R,

right channel: L + R

NRSW = 1 (SAP output)
· When there is "SAP" during SAP

discrimination
left channel: SAP, right channel: SAP

· When there is "No SAP", output is the

same as when NRSW = 0.

"Select dbx input and TV decoder output"

Conditions: FOMO = 0

NRSW = 0 (MONO or ST output)
As on the left

NRSW = 1 (SAP output)

· Regardless of the presence of SAP

discrimination,
dbx input: "SAP"
left channel: SAP, right channel: SAP

However, when there is no SAP, SAPOUT
output is soft muted (7dB)

Mode control

SAPC = 0

SAPC = 1

"Forced MONO"

FOMO = 1
· During SAP output: left channel: L + R, right channel: SAP
· During ST or MONO output: left channel: L + R, right channel: L + R

Change the selection conditions for "MONO or ST output" and "SAP output".

SAPC = 0: Switch to SAP output when there is SAP discrimination.

Do not switch to SAP output when there is no SAP discrimination.

SAPC = 1: Switch to SAP output regardless of whether there is SAP discrimination.

"MUTE"

M1 = 0: LSOUT output is muted.

CXA2174S

Decoder Output and Mode Control Table 1 (SAPC = 1)

Input signal mode

Mode detection

Mode control

dbx

input

Output

SAP

NOISE

NRSW

FOMO

SAPC

Lch

Rch

Note

(SAP) : The SAPOUT output signal is soft muted (approximately 7dB).

The signal is soft muted when NOISE = 1.

: Don't care.

SAP or NOISE discrimination may be made during MONO or STEREO input when the noise is

inputted in the weak electric field.

Then microcomputer reads "NOISE" status from IC and decides whether SAP is outputted.

"NOISE" status rises earlier than "SAP" status when the amount of noise is increased to COMPIN.

MUTE

SAP

MUTE

(SAP)

L R

MUTE

L R

MUTE

SAP

(SAP)

MUTE

SAP

(SAP)

L R

MUTE

SAP

(SAP)

L + R

SAP

L + R

(SAP)

L + R

SAP

L + R

(SAP)

L + R

SAP

L + R

(SAP)

L + R

SAP

L + R

(SAP)

L + R

SAP

L + R

(SAP)

L + R

SAP

(SAP)

L + R

SAP

(SAP)

L + R

SAP

(SAP)

MONO

STEREO

MONO & SAP

STEREO & SAP

CXA2174S

Decoder Output and Mode Control Table 2 (SAPC = 0)

Input signal mode

Mode detection

Mode control

dbx

input

Output

SAP

NOISE

NRSW

FOMO

SAPC

Lch

Rch

Note
(SAP) : The SAPOUT output signal is soft muted (approximately 7dB).

The signal is soft muted when NOISE = 1.

: Don't care.

SAP or NOISE discrimination may be made during MONO or STEREO input when the noise is
inputted in the weak electric field.
Then microcomputer reads "NOISE" status from IC and decides whether SAP is outputted.
"NOISE" status rises earlier than "SAP" status when the amount of noise is increased to COMPIN.

MONO

STEREO

MONO & SAP

STEREO & SAP

MUTE

(SAP)

L R

MUTE

L R

MUTE

L R

MUTE

(SAP)

MUTE

SAP

MUTE

(SAP)

L R

MUTE

SAP

L R

MUTE

(SAP)

L + R

(SAP)

L + R

(SAP)

L + R

SAP

L + R

(SAP)

L + R

SAP

L + R

(SAP)

L + R

(SAP)

L + R

(SAP)

L + R

SAP

L + R

(SAP)

L + R

SAP

L + R

(SAP)

CXA2174S

Description of Operation

The US audio multiplexing system possesses the base band spectrum shown in Fig. 1.

Fig. 1. Base band spectrum

Fig. 2. Overall block diagram (See Fig. 3 for the dbx-TV block)

Fig 3. dbx-TV block

PEAK DEV

kHz

L + R

50 15kHz

L-R

dbx-TV

AM-DSB-SC

SAP

dbx-TV NR

FM 10kHz

50 10kHz

TELEMETRY

FM 3kHz

= 15.734kHz

6.5f

PILOT

(COMPIN)

STEREO LPF

PLL

(VCO 8f

)

0°

90°

0°

MODE
CONTROL

PILOT

DET

MVCA

PILOT

CANCEL

MAIN LPF DE.EM

(MAIN OUT)

L + R

4.7µ

(MAIN IN)

L-R (DSB)

DET

INJ.

LOCK

SUBVCA

SUB LPF

WIDEBAND

(SUBOUT) (ST IN)

4.7µ

NR SW

dbx-TV

BLOCK

MATRIX

(Lch)

(Rch)

MODE

CONTROL

(SAP IN)

4.7µ

SAP (FM)

DET

SAP LPF

MODE
CONTROL

SAP BPF

(SAP OUT)

L R

to
TVSW

NOISE

DET

I C BUS
DECODER

SAP
DET

I C BUS
DECODER

NR SW

FIXED

DEEMPHASIS

VARIABLE

DEEMPHASIS

(VE OUT)

(VCA IN)

to
MATRIX

4.7µ

HPF

LPF

RMS

DET

RMS

DET

VCA

(ST IN)

(SAP IN)

CXA2174S

(1) L + R (MAIN)

After the audio multiplexing signal input from COMPIN (Pin 11) passes through MVCA, the SAP signal

and telemetry signal are suppressed by STEREO LPF. Next, the pilot signals are canceled. Finally, the

L R signal and SAP signal are removed by MAIN LPF, and frequency characteristics are flattened

(de-emphasized) and input to the matrix.

(2) L R (SUB)

The L R signal follows the same course as L + R before the pilot signal is canceled. L R has no

carrier signal, as it is a suppressed-carrier double-sideband amplitude modulated signal (DSB-AM

modulated). For this reason, the pilot signal is used to regenerate the carrier signal (quasi-sine wave)

to be used for the demodulation of the L R signal. In the last stage, the residual high frequency

components are removed by SUB LPF and the L R signal is input to the dbx-TV block via the NRSW

circuit after passing through SUBVCA.

(3) SAP

SAP is an FM signal using 5f

as a carrier as shown in the Fig. 1. First, the SAP signal only is

extracted using SAP BPF. Then, this is subjected to FM detection. Finally, residual high frequency

components are removed and frequency characteristics flattened using SAP LPF, and the SAP signal

is input to the dbx-TV block via the NRSW circuit. When there is no SAP signal, the Pin 20 output is

soft muted.

(4) Mode discrimination

Stereo discrimination is performed by detecting the pilot signal amplitude. SAP discrimination is

performed by detecting the 5f

carrier amplitude. NOISE discrimination is performed by detecting the

noise near 25kHz after FM detection of SAP signal.

(5) dbx-TV block

Either the L R signal or SAP signal input respectively from ST IN (Pin 18) or SAP IN (Pin 21) is

selected by the mode control and input to the dbx-TV block.

The input signal then passes through the fixed de-emphasis circuit and is applied to the variable de-

emphasis circuit. The signal output from the variable de-emphasis circuit passes through an external

capacitor and is applied to VCA (voltage control amplifier). Finally, the VCA output is converted from a

current to a voltage using an operational amplifier and then input to the matrix.

The variable de-emphasis circuit transmittance and VCA gain are respectively controlled by Each of

effective value detection circuits. Each of the effective value detection circuits passes the input signal

through a predetermined filter for weighting before the effective value of the weighted signal is detected

to provide the control signal.

(6) Matrix, TVSW

The signals (L + R, L R, SAP) input to "MATRIX" become the outputs for the ST-L, ST-R, MONO and

SAP signals according to the mode control and whether there is ST / SAP discrimination.

"TVSW" switches the "MATRIX" output signal and external input signal.

(7) Others

"MVCA" is a VCA which adjusts the input signal level to the standard level of this IC.

"Bias" supplies the reference voltage and reference current to the other blocks. The current flowing to

the resistor connecting IREF (Pin 13) with GND become the reference current.

CXA2174S

Application Circuit

GND

62k

METAL

± 1

5600p

1MEG

100k

0.012µ

4.7µ

DGND

220

LSOUT-R

LSOUT-L

SDA

SCL

DGND

MAININ

MAINOUT

PCINT1

PCINT2

PLINT

COMPIN

VGR

IREF

GND

SAPTC

AUX-L

AUX-R

VCAWGT

VCATC

VCAIN

VEOUT

VETC

VEWGT

SAPIN

SAPOUT

NOISETC

STIN

SUBOUT

4.7µ

10µ

1µ

4.7µ

100µ

4.7µ

2700P

3.3k

0.047µ

3.3µ

TANTALUM

1µ

3.9k

10µ

4.7µ

TANTALUM

4.7µ

+9V

LS OUTPUT

µ-

Composite

baseband

signal input

AUX INPUT

Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility fo

any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same

CXA2174S

C BUS block items (SDA, SCL)

C BUS load conditions: Pull-up resistor 4k

(Connect to +5V)

Load capacity 200pF (Connect to GND)

C BUS Control Signal

High level input voltage

Low level input voltage

High level input current

Low level input current

Low level output voltage SDA (Pin 3) during 3mA inflow

Maximum inflow current

Input capacitance

Maximum clock frequency

Minimum waiting time for data change

Minimum waiting time for start of data transfer

Low level clock pulse width

High level clock pulse width

Minimum waiting time for start preparation

Minimum data hold time

Minimum data preparation time

Rise time

Fall time

Minimum waiting time for stop preparation

SCL

BUF

: STA

LOW

HIGH

: STA

: DAT

: STO

3.0

4.7

4.0

4.7

4.0

4.7

250

4.7

5.0

1.5

0.4

100

300

µA

kHz

µs

SDA

SCL

BUF

S t

: STA

LOW

: DAT

HIGH

: STA

: STO

: DAT

No.

Item

Symbol

Min.

Typ.

Max.

Unit

CXA2174S

· I

C data Write (Write from I

C controller to the IC)

Data can be transferred in 8-bit units to be

set as required.

Sub address is incremented automatically.

· I

C data Read (Read from the IC to I

C controller)

· Read timing

Data Read is performed during SCL rise.

Address

SCL

ACK

DATA

ACK

SDA

H during Read

Hi-Z

DATA

IC output SDA

SCL

MSB

LSB

ACK

Read timing

ACK

DATA

Hi-Z

DATA (n)

DATA (n+1)

ACK

DATA (n + 2)

Hi-Z

LSB

MSB

Address

SDA

SCL

MSB

L during Write

MSB

LSB

Hi-Z

ACK

Sub Address

ACK

CXA2174S

Input level vs. Distortion characteristics 1 (MONO)

Distortion [%]

1.0

0.1

Input level vs. Distortion characteristics 2 (Stereo)

Distortion [%]

1.0

Input level [dB]

Input signal: Stereo L = R
(dbx-TVNR ON), 1kHz
0dB = 100% modulation level
V

= 9V, 30kHz using LPF, ST mode

Measurement point: LSOUT-L/R

Input level vs. Distortion characteristics 3 (SAP)

Distortion [%]

1.0

Input level [dB]

Standard level (100%)

Input signal: SAP (dbx-TVNR ON)
1kHz, 0dB = 100% modulation
level
V

= 9V, 30kHz using LPF, SAP mode

Measurement point: LSOUT-L/R

Standard level (100%)

Input signal: MONO (Pre-emphasis on), 1kHz
0dB = 100% modulation level
V

= 9V, 30kHz using LPF

Measurement point: LSOUT-L/R

CXA2174S

Frequency [kHz]

Gain [dB]

Stereo LPF frequency characteristics

100

70 100

Gain (FC main and FC sub) [dB]

Frequency [kHz]

Main LPF and Sub LPF frequency characteristics

100

120

SAP frequency characteristics and group delay

Group delay [µ

100

Gain

Group delay

3.8f

6.2f

Frequency [kHz]

Gain [dB]

Control data VOL-L, VOL-R

100

LSOUT output level [dB]

Volume charactiristics

Input:

AUXIN (Pins 29, 30)
1kHz, 490mVrms

Output: LSOUT (Pins 1, 2)

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: CXA2174S

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: CXA2174S