Sony CXA1598S, CXA1598M Datasheet

Description

The CXA1598M/S is a bipolar IC developed for recording equalizer amplifier in analog cassette decks. Incorporating the filter circuit has eliminated the external inductor. Also, each of the six parameters required for equalizer amplifiers can be set independently with external resistance.

Features

• Inductor (coil) is unnecessary

• The six parameters (low frequency gain, medium

frequency gain, peaking gain, medium frequency

compensation frequency, peaking frequency, and

Q) required for recording equalizer amplifiers can

be set independently with external resistance

• Low frequency boost is possible with an external

capacitor

• Built-in recording mute function

(requiring only an external time constant circuit to

implement soft mute)

• Built-in 2 channels

• Small package

Applications

Recording equalizer amplifier for stereo analog

cassette decks

Structure

Bipolar silicon monolithic IC

Absolute Maximum Ratings

• Supply voltage VCC 17 V

• Operating temperature

Topr –20 to +75 °C

• Storage temperature Tstg –65 to +150 °C

• Allowable power dissipation PD (CXA1598M) 570 mW

(CXA1598S) 880 mW

Operating Conditions

Power supply Dual power supplies (VCC – VEE)

±6.5 to 8.0 V

Single power supply (VCC)

10.0 to 16.0 V

– 1 –

CXA1598M/S

E95131A8Y

Recording Equalizer Amplifier for Stereo Cassette Decks

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.

CXA1598M

24 pin SOP (Plastic)

CXA1598S

22 pin SDIP (Plastic)

– 2 –

CXA1598M/S

Block Diagram and Pin Configuration

CXA1598M

GND

BIAS

REC EQ

REC OUT1

BOOST1

REC IN1

DGND

f × Q

PARAMETER

CONTROL

REC EQ

VEE

1415

VGS

FP CAL

REC MUTE

f/Q

IREF

REC OUT2

BOOST2

REC IN2

GH CAL

GP CAL

REC CAL

CXA1598S

GND

BIAS

REC EQ

REC OUT1

BOOST1

REC IN1

DGND

f × Q

PARAMETER CONTROL

REC EQ

VEE

1415

VGS

FP CAL

REC MUTE

f/Q

IREF

REC OUT2

BOOST2

REC IN2

GH CAL

GP CAL

REC CAL

– 3 –

CXA1598M/S

Pin Description (Ta = 25°C, VCC = 7.0V, VEE = –7.0V)

Pin No.

Symbol

I/O

Z (in) Equivalent circuit Description

Typical pin

voltage

DC AC

1 2

3 22 23 24

fxQ f/Q fM GL GH GP

O —

Connection pins of resistors for setting the recording equalizer amplifier parameters.

∗

Current input pins used to set the parameters for the recording equalizer amplifier.

∗

Setting currents for each parameter are generated by attaching resistors between these pins and the DGND pin.

1.2V —

27k

DGND

192

2 3

(20)

(21)

(22)

CXA

1598M

CXA

1598S

1 2

3 20 21 22

4 FP CAL

I 54k

Peaking frequency calibration pin.

∗

Controlled with DC voltages of 0 to 5V. High = Peaking frequency increased Low = Peaking frequency reduced

∗

Leave this pin open when not using the peaking frequency calibration function.

2.5V —

54k

(17)

19 REC CAL

I 54k

Recording level calibration pin.

∗

Controlled with DC voltages of 0 to 5V. High = Recording level gain increased Low = Recording level gain reduced

∗

Leave this pin open when not using the recording level calibration function.

Connected to GND.

2.5V —

5 DGND

I —

0.0V —

– 4 –

CXA1598M/S

6 REC MUTE

I —

Recording mute ON/OFF selection pin.

∗

Recording mute is controlled with DC voltages of 0 to 5V. High = Recording mute OFF Low = Recording mute ON

∗

Soft mute and fader can be switched over by changing the time constant of the external time constant circuit.

5.0V —

30k

REC IN1 REC IN2

I 50kΩ

Recording equalizer amplifier input pin.

0.0V

–18dBv

GND

50k

(16)

(7)

10 15

BOOST1 BOOST2

I 9.5kΩ

Connection pin of an external capacitor for low frequency boost.

∗

When low frequency boost is unnecessary, connect to GND for positive/negative dual power supplies; connect a capacitor (3.3µF or more) for a single power supply.

0.0V —

4.8k 5.5k 35.5k

280

34k

GND

(9)

(14)

9 GND (VG)

I —

Connect to GND for positive/negative dual power supplies. V

CC/2 (center

potential) for a single power supply. (Connect a capacitor of 10µF or more)

0.0V

—

Pin No.

Symbol

I/O

Z (in) Equivalent circuit Description

Typical pin

voltage

DC AC

CXA

1598M

CXA

1598S

– 5 –

CXA1598M/S

11 VEE

—

Connect to the negative power supply for positive/negative dual power supplies. Connect to GND for a single power supply.

–7.0V —10

12 13

REC OUT1 REC OUT2

—

Recording equalizer amplifier output pin.

0.0V

–3.0dBv

11 12

14 VCC I —

Positive power supply connection pin.

7.0V —13

50k

200

(11)

(12)

16 IREF

—

Reference current setting pin for monolithic filter.

∗

The reference current can be set by attaching a resistor between this pin and DGND.

1.2V —

(15)

27k

DGND

192

Pin No.

Symbol

I/O

Z (in) Equivalent circuit Description

Typical pin

voltage

DC AC

CXA

1598M

CXA

1598S

– 6 –

CXA1598M/S

20 GH CAL

I —

Medium frequency calibration pin.

∗

Controlled with DC voltages of 0 to 5V. High = Medium frequency level gain increased Low = Medium frequency level gain reduced

∗

Leave this pin open when not using the medium frequency calibration function.

2.5V —

54k

(18)

(19)

21 GP CAL

I —

High frequency calibration pin.

∗

Controlled with DC voltages of 0 to 5V. High = High frequency level gain increased Low = High frequency level gain reduced

∗

Leave this pin open when not using the high frequency calibration function.

2.5V —

Pin No.

Symbol

I/O

Z (in) Equivalent circuit Description

Typical pin

voltage

DC AC

CXA

1598M

CXA

1598S

– 7 –

CXA1598M/S

Electrical Characteristics (Ta = 25°C, VCC = 7.0V, VEE = –7.0V)

Standard settings RGL: 36k//510k, RGH: 62k//220k, RGP: 36k//110k, RfM: 39k//910k, Rf/Q: 47k//750k, RfxQ: 47k//620k

Recording equalizer amplifier reference output level (315Hz) (This output level is the tape reference 0dB which generates magnetic flux of 250nWb/m.)

Input level when the reference output level is 315Hz, –3.0dBv (For measurement, input a 315Hz, –18.0dBv signal to the REC IN pins and then measure the output level.)

Input a 1kHz signal and set the output so that THD (total harmonic distortion) is 1%. RL = 2.7kΩ (Measure the distortion of a +11dB level-up signal.)

Input a 1kHz, 0.0dB (reference input level) signal and measure the distortion. RL = 2.7kΩ (Measure the distortion as THD + N.)

With no signal, measure the noise using the "A"-WGT filter. Rg = 5.1kΩ (The measured value is indicated as the relative value compared to the reference level.)

With no signal, measure the DC offset voltage of the REC OUT pin.

REC-MUTE = 0.5V (Use a 1kHz BPF.) Input a 1kHz signal (+12dB level up) and measure the attenuation when REC MUTE is on.

REC-MUTE = 2.5V Input a 1kHz, 0.0dB (reference level) signal and measure the attenuation characteristics of the soft mute function.

REC-CAL = 5.0V Input a 315Hz signal (–20dB level down) and measure the amount of change compared to when the REC-CAL function is at the standard setting.

REC-CAL = 0.0V Input a 315Hz signal (–20dB level down) and measure the amount of change compared to when the REC-CAL function is at the standard setting.

10.0

±6.5

10.0

—

–19.8

11.0

—

57.0

–500

—

–6.0

5.0

–7.5

13.6

±7.0

14.0

–3.0

–18.3

11.5

0.12

65.0

–100

–4.5

6.0

–6.5

17.4

±8.0

16.0

—

–16.8

—

0.6

—

500

–80

–3.0

7.0

–5.5

dBv

Current consumption (ICC)

Operating voltage range 1 (positive/negative dual power supplies)

Operating voltage range 2 (single power supply)

Recording reference output level

Recording reference input level

Signal handling (1kHz, THD = 1%, RL = 2.7kΩ)

Total harmonic distortion (1kHz, 0.0dB, RL = 2.7kΩ)

S/N ratio ("A"-WGT filter)

Output DC offset voltage (REC OUT pin)

Mute characteristics 1 (REC-MUTE = 0.5V)

Mute characteristics 2 (REC-MUTE = 2.5V)

REC-CAL characteristics 1 (REC-CAL = 5.0V)

REC-CAL characteristics 2 (REC-CAL = 0.0V)

Item Conditions Min. Typ. Max. Unit

Entire LSIRecording equalizer amplifier

– 8 –

CXA1598M/S

GH-CAL = 5.0V RGH: 62k//220k, RGL • RGP: OPEN RfM: 300k, Rf/Q: 18k, RfxQ: 12k Input a 6.3kHz signal (–20dB level down) and measure the amount of change compared to when the GH-CAL function is at the standard setting.

GH-CAL = 0.0V RGH: 62k//220k, RGL • RGP: OPEN RfM: 300k, Rf/Q: 18k, RfxQ: 12k Input a 6.3kHz signal (–20dB level down) and measure the amount of change compared to when the GH-CAL function is at the standard setting.

GP-CAL = 5.0V RGP: 36k//110k, RGL • RGH: OPEN RfM: 300k, Rf/Q: 47k//750k, RfxQ: 47k//620k Input a signal (–20dB level down) and measure the amount of change compared to when the GP-CAL function is at the standard setting.

GP-CAL = 0.0V RGP: 36k//110k, RGL • RGH: OPEN RfM: 300k, Rf/Q: 47k//750k, RfxQ: 47k//620k Input a signal (–20dB level down) and measure the amount of change compared to when the GP-CAL function is at the standard setting.

FP-CAL = 5.0V Input a signal (–20dB level down) and measure the amount of change compared to when the FP-CAL function is at the standard setting.

FP-CAL = 0.0V Input a signal (–20dB level down) and measure the amount of change compared to when the FP-CAL function is at the standard setting.

RGL: 36k//510k, RGH • RGP: OPEN or RGH: 62k//220k, RGL • RGP: OPEN RfM: 39k//910k, Rf/Q: 18k, RfxQ: 12k

RGP: 36k//110k, RGL • RGH: OPEN RfM: 300k, Rf/Q: 47k//750k, RfxQ: 47k//620k

4.7

–5.5

3.9

–5.8

185

0.3

–5

–10

–15

5.7

–4.5

5.4

–4.3

200

2.4

17.8

4.2 0

–3

20.5

6.7

–3.5

6.9

–2.8

215

7 8

11 30

kHz

dB dB

GH-CAL characteristics 1 (GH-CAL = 5.0V)

GH-CAL characteristics 2 (GH-CAL = 0.0V)

GP-CAL characteristics 1 (GP-CAL = 5.0V)

GP-CAL characteristics 2 (GP-CAL = 0.0V)

FP-CAL characteristics 1 (FP-CAL = 5.0V)

FP-CAL characteristics 2 (FP-CAL = 0.0V)

fM medium frequency compensation frequency variable width

fp peaking frequency variable width

Peaking Q variable width GL low frequency gain variable

width GH medium frequency gain

variable width GP peaking gain variable width fM medium frequency

compensation frequency deviation

fp peaking frequency deviation

Recording equalizer amplifier

Item Conditions Min. Typ. Max. Unit

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