Datasheet LA2650 Datasheet (SANYO)

Page 1

Ordering number : EN5652

43097HA(OT) No. 5652-1/13

Overview

The LA2650 is a bass boost IC developed for use in minicomponent stereo systems, TV sets, and radio/cassette player products. The cutoff frequency is determined by external capacitors, and the boost gain, addition level, and boost on/off state can be controlled by a microcontroller.

Features

• The bass boost gain is variable over a maximum range of 20 to 35 dB in 5-dB steps, and the addition level into the left and right channels can be controlled over a 0 to –35 dB range in 3-dB and 5-dB steps. This allows an optimal boost for the source and volume to be acquired using microprocessor control.

• Includes two AGC circuits on chip: a level limiter (2 V rms) for the maximum input in low-frequency boost mode and a non-clipping limiter (i.e. clip prevention) circuit.

• Can be switched between 2D and 3D systems.

Functions

• Variable boost gain (20, 25, 30, and 35 dB)

• Boost level limiter, non-clipping limiter

• Variable boost addition level (0, –3, –6, –9, –15, –20, –25, and –35 dB)

• Left and right channel boost addition on/off

• Bass output pin for use in 3D systems

• Boost on/off

• LED on/off

• 8-bit serial microprocessor interface

Package Dimension

unit: mm

3021B-DIP20

SANYO: DIP20

[LA2650]

LA2650

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN

Bass Boost IC

Monolithic Linear IC

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

max 12 V Allowable power dissipation Pd max Ta ≤ 70°C 450 mW Operating temperature Topr –25 to +70 °C Storage temperature Tstg –40 to +150 °C

Specifications

Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Recommended supply voltage V

Operating voltage range V

op 5 to 10 V

Operating Conditions at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Low-level voltage V

0 to 1.5 V

High-level voltage V

3.5 to *5.5 V

Control Data Input Voltage Levels

Note: When VCCis under 5.7 V, the maximum value shall be VCC– 0.2 V.

Page 2

No. 5652-2/13

LA2650

Parameter Symbol Conditions

Ratings

Unit

min typ max

Quiescent current

CCO

T Boost: off 5 8 13 mA

CCO

B Boost: on 6 9 14 mA

Voltage gain

VGT V

= 0 dBm, Boost: off –2 0 +2 dB

VGB V

= 0 dBm, Boost: on –2 0 +2 dB

BST1

Boost: on, f

= 50 Hz, BST = 35 dB,

25.5 28.5 31.5 dB

ADD = 0 dB, V

= –30 dBm

BST2

Boost: on, f

= 50 Hz, BST = 35 dB,

21 24 27 dB

Boost level: high

ADD = 0 dB, V

= –20 dBm

BST3

Boost: on, f

= 50 Hz, BST = 35 dB,

13 15 17 dB

ADD = 0 dB, V

= –10 dBm

BST4

Boost: on, f

= 50 Hz, BST = 35 dB,

5 7 9 dB

ADD = 0 dB, V

= 0 dBm

BST1

Boost: on, f

= 50 Hz, BST = 30 dB,

15 18 21 dB

ADD = –6 dB, V

= –20 dBm

Boost level: low

BST2

Boost: on, f

= 50 Hz, BST = 30 dB,

8 10 12 dB

ADD = –6 dB, V

= –10 dBm

BST3

Boost: on, f

= 50 Hz, BST = 30 dB,

1.5 3.5 5.5 dB

ADD = –6 dB, V

= 0 dBm

Maximum output voltage

maxT THD = 1%, Boost: off 2.00 2.55 V

maxB THD = 1%, Boost: on 2.00 2.55 V

THD T

= –10 dBm, Boost: off,

0.008 0.03 %

Total harmonic distortion

BPF = 400 Hz to 30 kHz

THD B

VIN= –10 dBm, Boost: on, fi= 50 Hz,

0.3 0.9 %

LPF = 30 kHz

CT T

VO= 0 dB, Rg = 10 kΩ, DIN AUDIO,

80 88 dB

Crosstalk

Boost: off

CT B

VO= 0 dB, Rg = 10 kΩ, DIN AUDIO,

50 59 dB

Boost: on

Rg = 10 kΩ, JIS A, Boost: off,

–97 –90 dBm

Output noise voltage

Boost ADD = off

B Rg = 10 kΩ, JIS A, Boost: on –91 –84 dBm

LED current I

LED

RED LED 11 15 19 mA

Electrical Characteristics at Ta = 25°C, VCC= 9 V, fi= 1 kHz, RL= 10 kΩ, BST = 35 dB, ADD = 0 dB, BST:ADD = ON

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No. 5652-3/13

LA2650

Control Data for the Parameters in the Electrical Characteristics

*=don’t care

Parameter Conditions D1 D2 D3 D4 D5 D6 D7 D8

Quiescent current

CCO

T Boost: on L L L L L L L L

CCO

B Boost: off H H H H H H L H

Voltage gain V

= 0 dBm VG T Boost: off L L L L L L L L VG B Boost: on H H H H H H L H

Boost level: high Boost: on, f

= 50 Hz, BST = 35 dB, ADD = 0 dB H H H H H H L H

Boost level: low Boost: on, f

= 50 Hz, BST = 30 dB, ADD = –6 dB H L H L H H L H

Maximum output voltage THD = 1%

maxT Boost: off L L L L L L L L

maxB Boost: on H H H H H H L H

Total harmonic distortion V

= –10 dBm

THD T Boost: off, BPF = 400 Hz to 30 kHz L L L L L L L L THD B Boost: on, f

= 50 Hz, LPF = 30 kHz H H H H H H L H

Crosstalk V

= 0 dBm, Rg = 10 kΩ, DIN AUDIO CT T Boost: off L L L L L L L L CT B Boost: on H H H H H H L H

Output noise voltage Rg = 10 kΩ, JIS A

T Boost: off, Boost ADD = off L L L L L L L L

B Boost: on H H H H H H L H

LED current

LED

RED LED * * * * * * H *

Page 4

DC-CUT

VCA NF

5 to 10 V

Block Diagram

No. 5652-4/13

LA2650

VCA NF

DC-CUT

DECODER

Test Circuit

Page 5

Sample Application Circuit

No. 5652-5/13

LA2650

DC-CUT

VCA NF

5 to 10 V

DECODER

Page 6

Notes on LA2650 Operation

LPF cutoff frequency Use the following formula to calculate the cutoff frequency:

· fc = 1/(2πCR) Hz However: R = 50 kΩ, since the resistor is on chip. Thus the cutoff frequency can be set by the external capacitor. Example: C = 0.039 µF (As in the sample application circuit)

fc = 81.6 Hz Maximum boost gain Use the following formula to calculate the maximum boost gain.

· BASS OUT total gain (GB) = α +4 × 20 log10(1 + 4π2f2C2R2)

–1/2

+ β

Here,

α = Boost gain (20, 25, 30, or 35 dB) β = Addition level (0, –3, –6, –9, –15, –20, –25, or –35 dB)

f: Frequency C: The LPF external capacitor R = 50 kΩ (built in)

Example: When α = 35 dB, β = 0 dB, f = 50 Hz, C = 0.039 µF (As in the application circuit)

GB= 29.46 dB

No. 5652-6/13

LA2650

Pin Functions

Pin No. Pin Pin voltage (V) Pin function Equivalent circuit

1 IN-L 1/2 V

Signal input pin

20 IN-R The input impedance is 50 kΩ

2 BOOST 0.7 to 2 Smoothing pin for boost on/off switching

ON/OFF SMOOTHING

3 ENABLE Apply either 0 or 5 V. Serial control data input pins 4 DATA 5 CLOCK

7 DET-OUT 1.7 to 3.5 The detection attack and recovery times are set

by the external resistor and capacitor connected to this pin.

8 LED V

max. LED cathode

Influx current: 20 mA (maximum)

Continued on next page.

Page 7

No. 5652-7/13

LA2650

Pin No. Pin Pin voltage (V) Pin function Equivalent circuit

9 BASS-OUT 1/2 V

Low boost output for 3D systems

10 OUT-R 1/2 V

Signal outputs

11 OUT-L

12 LPF4 1/2 V

LPF connection for the low-boost circuit 13 LPF3 Internal resistor: 50 kΩ 19 LPF1

15 VCA NF 1/2 V

VCA feedback

16 LPF2 1/2 V

LPF connection for the low-boost circuit

Internal resistor: 50 kΩ

17 DC-CUT 1/2 V

Connection for DC-cut capacitor

18 V

REF

IN 1/2 V

REF

amplifier reference

Continued from preceding page.

Note: Pin voltage values are typical values.

Page 8

External Components

• C1, C15(0.22 to 10 µF) Input coupling capacitor. Note that the low-frequency gain is reduced at lower capacitances. The value of these capacitors determines the extreme low-frequency cutoff.

• C2(0.22 to 2.2 µF) Boost on/of switching circuit smoothing capacitor. The on/off switching time can be adjusted by changing the value of this capacitor. However, note that if the value is lowered excessively, switching noise (spikes) may appear.

• C3(10 to 220 µF) Detection capacitor. The attack and recover times can be adjusted by changing the value of this capacitor.

• C4, C5, C6(0.22 to 10 µF) Output coupling capacitors.

• C7, C8, C11, C

Low boost LPF capacitors. The low boost curve can be adjusted by changing the values of these capacitors. These capacitors may be omitted or, inversely, secondary or tertiary structures may be used.

• C9(22 to 220 µF) Power supply capacitor.

• C10(1.0 to 22 µF) VCA NF capacitor. Note that lowering the value of this capacitor will lower the low-frequency boost. This capacitor determines the extreme low-frequency cutoff.

• C12(1.0 to 22 µF) DC cut capacitor Note that lowering the value of this capacitor will lower the low-frequency boost. This capacitor determines the extreme low-frequency cutoff.

• C13(1.0 to 22 µF) RF reference LPF capacitor. The RF SVRR can be modified by changing the value of this capacitor.

• R1(200 kΩ to 3.9 MΩ) Detection recovery time adjustment (discharge resistor) Note that the total harmonic distortion is increased as the value of this resistor is reduced.

• R2(0 to 1 kΩ) LED current adjustment. LED current ≈ (VCC– V

LED

– 0.9)/(R2+ 300)

The maximum LED current is 20 mA.

No. 5652-8/13

LA2650

Page 9

Control Format

No. 5652-9/13

LA2650

Add Level Select

D1, D2, D3 Add level Notes

H, H, H 0 dB H, H, L –3 dB H, L, H –6 dB

H, L, L –9 dB

L, H, H –15 dB

L, H, L –20 dB L, L, H –25 dB L, L, L –35 dB Initial setting for the V

on time

Boost Gain Select

D4, D5 Boost gain Notes

H, H 35 dB H, L 30 dB L, H 25 dB

L, L 20 dB Initial setting for the V

on time

Left and right channel boost add on/off

L H

D6 off on

LED on/off

L H

D7 off on

Boost on/off

Mode Switching

• Add level select

— Selects the addition level at the output mixing amplifier for the low-frequency signals from the boost amplifier.

• Boost gain select

— Selects the amplification applied to low-frequency signals by the boost amplifier.

• Left and right channel boost add on/off

— Turns addition of the low-frequency boosted signal to the left and right channels on or off.

• LED on/off

— Turns the LED on or off.

• Boost on/off

— Turns the amplification of low-frequency signals on or off.

L H

D8 off on

Note: The VCCon time and all other data is initialized to low.

Data

Page 10

Recommended Data Transfer Procedure

The boost gain select and the left and right channel boost add on/off settings should only be set at power on. During normal operation, control the device by setting the add level select and boost on/off settings. Using the add level select and boost on/off settings for control is superior from the standpoint of minimizing switching noise (spikes).

Limiter (ALC) Operation

• The level limiter operates when the boost gain amplifier output level reaches about 2 V rms, and suppress further level

increases above that point.

• The non-clipping limiter operates to prevent boost gain amplifier output clipping at power-supply voltages (about 8.5 V

and lower) at which the output cannot be amplified to the operating level of the level limiter.

• Notes on Control Data

— Data is read in on the rising edge of the clock signal. — Data consists of 8 bits, D1 through D8. — The input data is latched on the rising edge of the enable signal. — When the LA2650 is not being controlled, the clock and the enable signal must be held high. — Intervals between commands

The timing of the intervals on the enable signal must meet the conditions shown in the figure below.

• Initial Settings at Power on

— All data is reset to low when power is first applied. — Applications should send their initial data settings once the IC is fully operational after power is applied, i.e. about

0.5 second after power is applied.

• Data Timing

No. 5652-10/13

LA2650

Timing characteristics min typ max unit Enable clock delay time t

5 µs

Data clock delay time t

5 µs

Clock high-level hold time t

5 µs

Clock low-level hold time t

5 µs

Clock enable delay time t

5 µs

Clock cycle time t

10 µs

At least 10 µs

Enable

Data

Clock

Page 11

Total harmonic distortion, THD – %

crosstalk, CT – dB

No. 5652-11/13

LA2650

Quiescent current, I

CCO

– mA

Output voltage, V

– dB

Output voltage, V

– dB

Output voltage, V

– dB

Output voltage, V

– dB

Output voltage, V

– dBOutput voltage, V

– dB

Total harmonic distortion, THD – %

Supply voltage, VCC, – V

Input frequency, fi– Hz

Input voltage, VIN– dBm

Input frequency, fi– Hz

Filter: flat

Filter: 80 kHz LPF

L → R R → L is identical.

I/O C = 1 µF

Page 12

No. 5652-12/13

LA2650

Voltage gain, VG – dB

Output noise voltage, V

– dB

Output voltage, V

– dBm

Current drain, I

LED

– mA

Output noise voltage, V

– dBm

Total harmonic distortion, THD – %

Crosstalk, CT – dB

Maximum output voltage, V

Omax

– V

Supply voltage, VCC– V

Input frequency, fi– Hz

Supply voltage, VCC– V

Input frequency, fi– Hz

Input C = 1 µF

I/O C = 1 µF THD = 1%

I/O C = 1 µF Rg = 10 kΩ

RL= 10 kΩ I/O C = 1 µF

I/O C = 1 µF Rg = 10 kΩ

L → R R → L is identical.

Total harmonic distortion, THD – %

With no LED series resistor

Page 13

No. 5652-13/13

LA2650

This catalog provides information as of May, 1997. Specifications and information herein are subject to change without notice.

■ No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss.

■ Anyone purchasing any products described or contained herein for an above-mentioned use shall: ➀ Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and

distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use:

➁ Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on

SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.

■ Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties.

Voltage gain, VG – dB

Supply voltage, VCC– V

Total harmonic distortion, THD – %

Input voltage, VIN– dBm

Input C = 1 µF