Datasheet CXA2513M Datasheet (Sony)

3-Band Preset Graphic Equalizer IC (with standby and memory on last preset mode)

Description

The CXA2513M is a 3-band preset graphic equalizer developed for stereo set, cassette tape recorder with radio, etc. It has 5 modes: FLAT, ROCK, VOCAL, POP and JAZZ. The selection is via 5 control pins. The center frequencies of three bands are 100Hz, 1kHz and 10kHz. The center frequencies of these bands are determined by 2 external resistors. It also has a standby feature. When the standby pin goes low, the IC stores the last preset mode. When this pin goes high, the IC restores the last preset mode before standby. It can be initialized to any one of the two preset modes (FLAT, ROCK) upon power up.

Features

• Very few external parts

• 3-band monolithic filters (100Hz, 1kHz, 10kHz)

• The center frequencies of the band-pass filters can

be adjusted

• 5 preset modes (FLAT, ROCK, VOCAL, POP, JAZZ)

• Equips with output ports to drive external LEDs

• Mute pulse output pin

• Standby feature with last preset mode memory

• Can be initialized to one of the two preset modes

(FLAT or ROCK)

Applications

Preset graphic equalizer for cassette tape recorder with radio and portable stereo

Structure

Bipolar silicon monolithic IC

Absolute Maximum Ratings (Ta = 25°C)

• Supply voltage VCC 12 V

• Allowable power dissipation PD 600 mW

• Storage temperature Tstg –65 to +150 °C

Recommended Operating Conditions

• Supply voltage VCC 4.5 to 10 V

• Operating temperature Topr –20 to +75 °C

– 1 –

E97741-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.

CXA2513M

20 pin SOP (Plastic)

– 2 –

CXA2513M

Block Diagram and Pin Configuration

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

1

VOCAL

FLAT

JAZZ

POP

MUTE DET+

ROCK

MUTE DET–

FLAT INIT

STANDBY

TIMING CAP

V

CC

GND

IN2

IN1

LOW-FREQ

ISET

MUTE

REF

OUT2

OUT1

MUTE

DETECTOR

GRAPHIC

EQUALIZER

14dB

CURRENT CONTROL

GRAPHIC

EQUALIZER

BIAS

14dB

INITIAZATION

MODE

LATCH

&

MEMORY

INITIALIZATION

MODE AND

STANDBY

– 3 –

CXA2513M

Pin Description

Pin No.

1 2

3 19 20

FLAT POP ROCK JAZZ VOCAL

Mode selection input pins with LED driving capability.

Flat initialization pin. If the pin is connected to a 220nF capacitors, it initializes to FLAT mode. If the pin is not connected, it initializes to ROCK mode.

Timing capacitor pin. It is connected to a capacitor. The charging and discharging of this capacitor will determine the timing of the logic control.

GND pin.

VCC or 1V

—

VCC – 5∗VBE

GND

FLAT INIT

TIMING CAP

GND

4

5

6

Symbol Voltage

I/O resistance

Equivalent circuit Description

2

3 19 20

1

147 50k

50k

20k

GND

V

CC

GND

V

CC

147

20k

4

5

GND

V

CC

147 150k

20k

100k

6

GND

– 4 –

CXA2513M

No.

714IN1

IN2

Signal input pin.

VCC/2

50k

Symbol Voltage

I/O resistance

Equivalent circuit Description

7 14

GND

V

CC

50k

147

5k 11.5k

8 ISET

Reference current setting pin (for graphic equalizer). Normally 160kΩ resistor is connected.

1.2V —

GND

V

CC

147

300

8

9 REF

Signal reference voltage pin. A capacitor is connected for ripple rejection.

VCC/2 40k

GND

V

CC

9

147

80k

300

1011OUT1

OUT2

Signal output pin.

VCC/2 0

11

GND

V

CC

10

300

NPN

– 5 –

CXA2513M

Pin No.

17

MUTE DET–

Negative input of the mute detector comparator.

Positive input of the mute detector comparator.

—

18

MUTE DET+

—

Symbol Voltage

I/O resistance

Equivalent circuit Description

GND

V

CC

17

4k4k

10k

147

10k147

18

13

LOW FREQ

Low frequency adjustment pin. Set the center frequency of the bass.

VCC 0

GND

V

CC

147

10k 7.5k

13

12

MUTE

Mute pulse output pin.

0 300k

GND

V

CC

15k

40k

300k

12

40k

147

15 VCC Power supply pin.VCC —

15

V

CC

16

STAND BY

Standby pin. When not connected, the IC in standby. When connected to VCC, the IC in normal operation

— 20k

GND

V

CC

16

147

20k

50k

5k 5k 5k 5k 5k 5k

– 6 –

CXA2513M

Electrical Characteristics (Ta = 27°C, VCC = 8V, C = 22µF)

Symbol ICC (STANDBY) ICC (FLAT)

Vout (max.) GE (FLAT) B

GE (FLAT) M GE (FLAT) T GE (POP) M GE (POP) T GE (ROCK) B GE (ROCK) T GE (VOCAL) B GE (VOCAL) M GE (JAZZ) B GE (JAZZ) M GE (JAZZ) T Bal ∆fO

THD

VNOIS (FLAT)

CS

PSRR

ILED

Vmute (off)

Vmute (on)

Vstandby (off)

Current consumption Current consumption

Maximum output level

Balance Center frequency deviation

Total harmonic distortion

Noise level

Channel separation Power supply ripple

rejection Maximum LED drive

current Mute off voltage

Mute on voltage

Standby off voltage

Standby pin is low - No input FLAT mode - No input FLAT preset mode, f = 1kHz @

THD = 1%, RL = 10kΩ Vin = 0.05Vrms, fO = 100Hz Vin = 0.05Vrms, fO = 1kHz Vin = 0.05Vrms, fO = 10kHz Vin = 0.05Vrms, fO = 0.8 to 1.2kHz Vin = 0.05Vrms, fO = 0.8 to 12kHz Vin = 0.05Vrms, fO = 0.8 to 120Hz Vin = 0.05Vrms, fO = 0.8 to 12kHz Vin = 0.05Vrms, fO = 0.8 to 120Hz Vin = 0.05Vrms, fO = 0.8 to 1.2kHz Vin = 0.05Vrms, fO = 0.8 to 120Hz Vin = 0.05Vrms, fO = 0.8 to 1.2kHz Vin = 0.05Vrms, fO = 0.8 to 12kHz GE (Out1) – GE (Out2)

RL = 10kΩ, FLAT preset mode, f = 1kHz, Vin = 0.1Vrms

RL = 10kΩ, FLAT preset mode, DIN AUDIO filter, Vin = 0Vrms

Vin = 0.1Vrms at 1kHz, FLAT preset mode

Vin = 0.1Vrms at 100Hz, FLAT preset mode

Current flowing through LED connected to a switch depressed

Vm_det+ = 1/4VCC and Vm_det– = 1/2VCC

Vm_det+ = 3/4VCC and Vm_det– = 1/2VCC

ICC goes from standing to normal operation

— —

2.7

12.6

12.55

12.5

16.5

18.0

21.0

20.0

14.5

20.0

16.2

15.5

5.5 –1

–20

—

40

15

—

6.8

3

17.5

9.6

3.0

14.6

14.55

14.5

19.0

21.0

24.0

23.0

17.0

23.0

18.7

18.0

8.0 0 0

0.25

19

47

46

—

0

7.1

—

45.0

14.0 —

16.6

16.55

16.5

21.5

24.0

27.0

26.0

19.5

26.0

21.2

20.5

10.5

1

20

1

55

—

0.1

—

µA

mA

Vpeak

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

% %

µVrms

dB

mA

V

Parameter Measurement conditions Min. Typ. Max. Unit

PRESETS

Normal

Bass Mid Treble Mid Boost Treble Boost Bass Boost Treble Boost Bass Boost Mid Boost Bass Boost Mid Boost Treble Cut

POP

ROCK

VOCAL

JAZZ

– 7 –

CXA2513M

Switches Statuses

Item

1 2

3

4

5

6

7

8

—

•

—

•

—

•

—

— —

—

•

—

•

—

•

—

— —

—

•

—

•

—

•

—

— —

—

•

—

•

—

•

—

— —

—

•

—

•

—

•

3 2

2

off off

on

•

on on

on

off off

off

— —

V3 V4

ICC ICC

Out1 Out2

S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12

Input pins

Test Pt.

•

2

on

•

ononoff

off

9

10

– 8 –

CXA2513M

Item

11

12

13

14 15

16 17 18

•

—

— —

— — —

—

— —

— — —

—

— —

— — —

—

— —

— — —

•

O

•

O

•

2

2 2

2 2 3

on

on on

on on on

•

O

•

on

off on

on on on

off

off off

off off off

V3 V4

V3 = 0 V4 = 0

V4 V3

V5 V5

— — —

V2

Out1 Out2

— Mute Mute

ICC

S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12

Input pins

Test Pt.

– 9 –

CXA2513M

Electrical Characteristics Measurement Circuit

OUT2

GND

GND GND GND

C5

22µF

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

VOCALFLAT

JAZZPOP

M_DET+ROCK

M_DET–F_INIT

STANDBYT_CAP

V

CC

GND

IN2IN1

L_FREQISET

MUTEREF

OUT2OUT1

S2

D1

GND

S1

D3

GND

S3

D5

GND

OUT1

R8

10k

C7

10µF

GND

R6

160k

GND

C3

10µF

V3 AC

C2

100nF

GND

C1

220nF

S12

GND

R1

470

MUTE

ICC

GND

I1

15µA

V1 8V

GND

R5

33k

R4

33k

R3

33k

GND

S7

R2

33k

S4

D4

S5

D2

GND

V2 3V

1 2 3

S8

GND

V4 AC

C4

10µF

R7

33k

GND

C6

3.3nFR910k

C8

10µF

S9

S11

R10

47

C9

470µF

V6 8V

GND

V5

AC

GND

S10

S6

1

– 10 –

CXA2513M

Application Circuit

OUT2

GND GND GND

C8

22µF

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

VOCALFLAT

JAZZPOP

M_DET+ROCK

M_DET–F_INIT

STANDBYT_CAP

V

CC

GND

IN2IN1

L_FREQISET

MUTEREF

OUT2OUT1

S2

D1

GND

S1

D3

GND

S3

D5

GND

OUT1

C10

10µF

GND

R5

160k

C2

220nF

GND

C3

100nF

To MUTE pin of POWER AMPLIFIER

V

CC

GND

S6

S4

D4

S5

D2

GND

C7

10µF

R6

33k

GND

C9

3.3nF

R1

18k

C11

10µF

IN2VCC

GNDGND

C5

100nF

C4

470µF

VCC

C

C1

GND

R2

180

R3

22k

R4

180

∗

C6

10µF

IN1

∗ OPTIONAL CAPACITOR no capacitor – ROCK MODE

1

Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.

– 11 –

CXA2513M

Description of Operation

1. Graphic Equalizer

• Conventional system

BOOSTCUT-OFF

R2

Vo

Operational amplifier

R

1

VI

RO = R1 = R2

RV

L

C R

Z (s)

Fig. 1

Fig. 1 indicates the conventional graphic equalizer system. This circuit performs boost and cut-off near "fO" controlled by the potentiometer Rv. ("fO" is resonance frequency determined by Z (s) (formed LCR).) The operation can be seen as follows: When the LCR circuit goes to the far left of Rv, a state of graphic equalizer becomes maximum cut-off. At that time, assuming transmittance as T (s), the following expression can be obtained.

T (s) =

Z (s) + Ro

Z (s)

T (s) = =

Z (s)

Z (s) + RO

LCS2+ RCS + 1

LCS2+ (R + RO) Cs + 1

LCS2+ (R + RO) CS + 1

LCS2+ RCS + 1

Here as

Z (s) = sL + R +

sC

1

Defining fO as fO =

, ωo as ωo =

2π

ωo

LC

1

, and Q as Q =

, the frequency response can be obtained

at cut-off

R

ωoL

Also, when LCR circuit goes to the far right of Rv, a state of graphic equalizer becomes maximum boost. At that time transmittance is:

Defining fO, ωo and Q as for cut-off the frequency response can be obtained at boost.

Then T (s) =

– 12 –

CXA2513M

Fig. 2 indicates frequency response at boost and cut-off.

Frequency [Hz]

Response [dB]

0dB

f

O

Boost

Flat

Cut-off

f

O =

1

2π √ LC

Fig. 2

• CXA2513M system

IbIc

Gm2Gm1

R

Vo

Operational amplifier

Z (s)

H (s)

R

V

I

H (s) =

ωo

Q

s

ωo

Q

s

2

+ s + ωo

2

Fig. 3

The structure of the graphic equalizer used in this IC is shown on Fig. 3. This circuit performs boost and cut-off controlled by 2 transconductance amplifiers that can vary the conversion coefficient through control currents Ib, and Ic around ωo. ("ωo" is center frequency determined by band-pass filter.) Output impedance Z (s) of Gm1, Gm2 can be expressed as

T (s) =

H (s) · Gm1

1

– 13 –

CXA2513M

Here, using ωo and Q BPF transmittance H (s) is expressed as

H (s) =

ωo

Q

ωo

H (s) = s + +

ωo · Gm1

Q

Gm1

1

Gm1 · s

ωo · Q

Q

+ ωo

2

S2+

s

T (s) = =

(1 + R · Gm) · ωo

2

Q

ωo

Z (s) + R

Z (s)

Q

· s + ωo

2

S2+

· s + ωo

2

T (s) = =

(1 + R · Gm) · ωo

2

Q

ωo

Z (s)

Z (s) + R

Q

· s + ωo

2

S2+

· s + ωo

2

The formula shows that this system and the aforementioned LCR circuit have equivalent impedance characteristics on Z (s). Then, regarding Gm as the maximum value of Gm1 and Gm2, the operation can be observed as follows. Maximum cut-off occurs when Gm1 = Gm and Gm2 = 0. At that time transmittance T (s) is expressed as

This is equal to the frequency response of the conventional graphic equalizer at cut-off. Also, maximum boost occurs when Gm1 = 0 and Gm2 = Gm. At that time transmittance T (s) is given by as

This is equal to the frequency response of the conventional graphic equalizer at boost. As far as the operation is concerned the graphic equalizer on this IC and the conventional graphic equalizer are equal, even when the system differs. The merit in using this IC's system rests with the fact that monolithic filter technology realizes a graphic equalizer without external parts. The structure of the actual graphic equalizer, including BPF, is shown on Fig. 4.

I BOOSTI CUT-OFF

Gm4Gm3

R2

30k

Vo

SUM

V

I

R1

30k

GNDGND

C3

C1

GND

1

GND

Gm2

C2

GND

V1

Gm1

Fig. 4

– 14 –

CXA2513M

2. Power Up

There are two ways of powering up the CXA2513M. They are

1) VCC pin (Pin 15) goes high, and after some time, the STANDBY pin (Pin 16) goes high.

2) VCC pin and STANDBY pins both goes high together.

The two ways of power-up will results in different timing diagram and different initial mode.

If both VCC and STANDBY pins go high together, the REF capacitor (Pin 9) will charge to half VCC. The IC will be initialized to ROCK mode. The timing diagram is shown in Fig. 5.

VCC pin

STANDBY pins

REF pin

TIMING CAP pin

ISET pin

LATCH OUTPUT ENABLE

LATCH ENABLE

MUTE pin

t2

Only ROCK mode initialized

Latch output disable

Bandgap voltage present

Charge to V

CC

Discharge to clamped voltage

Charge to 0.5V

CC

Turn on at the same time

Fig. 5

– 15 –

CXA2513M

If the VCC pin goes high while the STANDBY pin is not connected to VCC, the IC is in standby condition. The REF capacitor (Pin 9) and timing capacitor (Pin 5) will charge to VCC. Now, if the STANDBY pin is switched to VCC, the REF capacitor will discharge to half VCC and the timing capacitor will discharge to a clamped voltage (VCC – 5∗VBE).

During the discharging of timing capacitor, all the LEDs light up. When the timing capacitor voltage reaches a certain threshold voltage, only the ROCK LED or FLAT LED lights up depending on Pin 4. If the Pin 4 is connected to a capacitor, the IC is initialized to FLAT mode. If the Pin 4 is not connected, the IC is initialized to ROCK mode. The timing diagram is shown in Fig. 6.

VCC pin

STANDBY pins

REF pin

TIMING CAP pin

ISET pin

LATCH OUTPUT ENABLE

LATCH ENABLE

MUTE pin

t2

Latch disable

AII LEDs light up

Bandgap voltage present

Charge to V

CC

Charge to VCC

Normal operation

Discharge to 0.5VCC

Normal operation

Store the present mode

Latch through what depressed mode

Mute On

t1

Latch on the initial mode

Restore the previous mode

Standby on

Discharge to clamped voltage

Delay the shutdown

Fig. 6

– 16 –

CXA2513M

3. Mute Pulse Generation

The CXA2513M has one voltage comparator built-in. The built-in voltage comparator is used to produce mute pulse during the depress of the preset mode switches. During depress the switch, there is a voltage pulse of about 1V depending appearing at the cathode of the LEDs.

The mute detector comparator is used to detect this voltage changes at the cathode of LEDs and produce mute pulse at Pin 12. The polarity of the mute pulse can be set. When the M_DET+ pin (Pin 18) is higher than the M_DET– pin (Pin 17), the MUTE pin (Pin 12) will be high. When the M_DET+ pin (Pin 18) is lower than the M_DET– pin (Pin 17), the MUTE pin (Pin 12) becomes low.

A capacitor is used to store the initial voltage before the depression of the mode switch. Once the switch is depressed, the capacitor starts discharge. The values of the resistors and capacitor set the duration of the mute pulse.

Notes on Operation

1) Value of Timing Capacitor

The timing and the duration of the MUTE pin and the LEDs light-up depends on the value of the timing capacitor as the timing capacitor is discharging to (VCC – 5∗VBE).

The charging time constant is 250K∗(timing capacitor) and the discharging time constant is 150K∗(timing capacitor).

The two threshold values: a) Latch Output Enable (LATCH_OE_ctl)

b) Latch enable/Mute disable (LATCH_ctl)

The threshold values of the Latch Output Enable (LATCH_OE_ctl) is set to (VCC – 3∗VBE) and the threshold values of the Latch enable/Mute disable (LATCH_ctl) is set to (VCC – 4∗VBE).

So, the duration for all the LEDs light-up is

2∗VBE = (5VBE) exp (–t1/RC) where R = 150K

and the sound appears after t2 seconds if the mute pulse output pin is used. This t2 is given by

VBE = (5VBE) exp (–t2/RC) where R = 150K

Therefore, depending on the requirements of the time on the mute sound and the duration of all LEDs light-up, choose the value of the timing capacitors.

– 17 –

CXA2513M

2) Initialize Preset IC

The preset IC can be initialized into any one of the two modes out of the total 5 mods. The two modes are:

a) FLAT

b) ROCK In order to initialize the preset IC into FLAT, one external capacitor (220nF) is required. While to initialize the preset IC to ROCK, no external capacitor is required.

3) Supply voltage Ripple Rejection

The value of the REF capacitor (Pin 9) determines the supply voltage ripple rejection ratio (SVRR). A reduce in this capacitance value decreases on the supply voltage ripple rejection ratio (SVRR).

4) Center Frequency of Band-pass Filters

The center frequency of the graphic equalizer is determined by an external resistor. This resistor is 160kΩ external resistor connected to the ISET pin (Pin 8). It is recommended to use a resistor with the small dispersion and temperature coefficients.

By varying the value of the resistor connected to the ISET pin, the frequency response of the graphic equalizer can be shifted. By reducing the resistor value, all the three band-pass filters shift to high band. By increasing the resistor value, the filters shift to lower band.

The center frequency of the bass band-pass filter can be varied independently. This bass center frequency is determined by the external resistor (33kΩ) connected to the LOW-FREQ pin (Pin 13). By reducing the value of this resistor, the bass center frequency shifts to higher frequency. By this value, the bass center frequency shifts to lower frequency.

LOW-FREQ resistor

56kΩ 33kΩ 10kΩ

70Hz 100Hz 200Hz

Bass center frequency

– 18 –

CXA2513M

Example of Representative Characteristics

AC response

a) Frequency response of FLAT mode

10

1

10

2

10

3

10

4

10

5

23 22 21 20 19 18 17 16 15 14 13 12

FLAT MODE

[freq]

: Output

10

1

10

2

10

3

10

4

10

5

21.0

20.5

19.5

18.5

18.0

17.5

17.0

16.5

16.0

15.5

15.0

14.5

POP MODE

20.0

19.0

AC response

b) Frequency response of POP mode

[freq]

: Output

10

1

10

2

10

3

10

4

10

5

23.5

22.5

20.5

18.5

18.0

17.5

17.0

16.5

16.0

15.5

15.0

14.0

VOCAL MODE

21.5

19.5

14.5

23.0

22.0

21.0

20.0

19.0

AC response

d) Frequency response of VOCAL mode

[freq]

: Output

10

1

10

2

10

3

10

4

10

5

24.5

23.5

22.5

21.5

20.5

19.5

18.5

17.5

16.5

15.5

15.0

14.5

ROCK MODE

24.0

23.0

22.0

21.0

20.0

19.0

18.0

17.0

16.0

AC response

c) Frequency response of ROCK mode

[freq]

: Output

10

1

10

2

10

3

10

4

10

5

19 18 17 16 15 14 13 12 11 10

9.0

8.0

JAZZ MODE

AC response

e) Frequency response of JAZZ mode

[freq]

: Output

0 5 10 15 20

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1 0

1 6 11 162 7 12 173 8 13 184 9 14 19

LED current [mA]

LED driving voltage [V]

LED current vs. LED driving voltage

f) LED current vs. LED driving voltage (Pins 1, 2, 3, 19 and 20)

– 19 –

CXA2513M

0 20 40 60 80 100

Capacitance [µF]

–60

–55

–50

–45

–40

–35

–30

–25

–20

Ripple rejection @100Hz [dB]

Ripple rejection @100Hz vs. Capacitance

g) Ripple Rejection at 100Hz vs. Reference Capacitor (FLAT MODE)

100 120 160 180 200 220

Resistance [kΩ]

60

70

80

90

100

110

120

130

140

Bass center frequency [kHz]

Bass center frequency vs. Resistance

h) Bass Center Frequency vs. ISET Resistor (L-FREQ Resistor = 33kΩ)

140

150

160

100 120 160 180 200 220

Resistance [kΩ]

0.7

0.8

0.9

1

1.1

1.2

1.3

1.4

Mid center frequency [kHz]

Mid center frequency vs. Resistance

140

1.5

1.6

i) Mid Center Frequency vs. ISET Resistor

100 120 160 180 200 220

Resistance [kΩ]

7

8

9

10

11

12

13

14

Treble center frequency [kHz]

Treble center frequency vs. Resistance

140

15

16

j) Treble Center Frequency vs. ISET Resistor

17

0 40 60 80 100

Resistance [kΩ]

0

50

100

150

200

250

300

350

400

Bass center frequency [kHz]

Bass center frequency vs. Resistance

k) Bass Center Frequency vs. L-FREQ Resistor (ISET Resistor = 160kΩ)

20

450

500

– 20 –

CXA2513M

Package Outline Unit: mm

SONY CODE EIAJ CODE

JEDEC CODE

SOP-20P-L01 SOP020-P-0300

PACKAGE STRUCTURE

PACKAGE MATERIAL LEAD TREATMENT LEAD MATERIAL PACKAGE MASS

COPPER ALLOY

SOLDER PLATING

EPOXY RESIN

0.3g

20PIN SOP (PLASTIC)

12.45 – 0.1

+ 0.4

20

11

0.45 ± 0.1

1.27

10

1

5.3 – 0.1

+ 0.3

7.9 ± 0.4

6.9

0.2 – 0.05

+ 0.1

0.5 ± 0.2

0.1 – 0.05

+ 0.2

1.85 – 0.15

+ 0.4

0.15

0.24

M