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Ordering number : EN5652
Monolithic Linear IC
LA2650
Bass Boost IC
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.
* * * * *
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
[LA2650]
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)
SANYO: DIP20
Specifications
Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg Ta 70C Conditions Ratings 12 450 -25 to +70 -40 to +150 Unit V mW C C
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Operating voltage range Symbol VCC VCC op Conditions Ratings 9 5 to 10 Unit V V
Control Data Input Voltage Levels
Parameter Low-level voltage High-level voltage Symbol VIL VIH Conditions Ratings 0 to 1.5 3.5 to *5.5 Unit V V
Note: When VCC is under 5.7 V, the maximum value shall be VCC - 0.2 V.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
43097HA(OT) No. 5652-1/13
LA2650 Electrical Characteristics at Ta = 25C, VCC = 9 V, fi = 1 kHz, RL = 10 k, BST = 35 dB, ADD = 0 dB, BST:ADD = ON
Parameter Symbol ICCOT ICCOB VGT Voltage gain VGB BST1 BST2 Boost level: high BST3 BST4 BST1 Boost level: low BST2 BST3 Maximum output voltage VO maxT Boost: off Boost: on VIN = 0 dBm, Boost: off VIN = 0 dBm, Boost: on Boost: on, fi = 50 Hz, BST = 35 dB, ADD = 0 dB, VIN = -30 dBm Boost: on, fi = 50 Hz, BST = 35 dB, ADD = 0 dB, VIN = -20 dBm Boost: on, fi = 50 Hz, BST = 35 dB, ADD = 0 dB, VIN = -10 dBm Boost: on, fi = 50 Hz, BST = 35 dB, ADD = 0 dB, VIN = 0 dBm Boost: on, fi = 50 Hz, BST = 30 dB, ADD = -6 dB, VIN = -20 dBm Boost: on, fi = 50 Hz, BST = 30 dB, ADD = -6 dB, VIN = -10 dBm Boost: on, fi = 50 Hz, BST = 30 dB, ADD = -6 dB, VIN = 0 dBm THD = 1%, Boost: off Conditions Ratings min 5 6 -2 -2 25.5 21 13 5 15 8 1.5 2.00 2.00 typ 8 9 0 0 28.5 24 15 7 18 10 3.5 2.55 2.55 0.008 0.3 80 50 88 59 -97 -91 11 15 -90 -84 19 0.03 0.9 max 13 14 +2 +2 31.5 27 17 9 21 12 5.5 Unit mA mA dB dB dB dB dB dB dB dB dB V V % % dB dB dBm dBm mA
Quiescent current
VO maxB THD = 1%, Boost: on THD T VIN = -10 dBm, Boost: off, BPF = 400 Hz to 30 kHz VIN = -10 dBm, Boost: on, fi = 50 Hz, LPF = 30 kHz VO = 0 dB, Rg = 10 k, DIN AUDIO, Boost: off VO = 0 dB, Rg = 10 k, DIN AUDIO, Boost: on Rg = 10 k, JIS A, Boost: off, Boost ADD = off Rg = 10 k, JIS A, Boost: on RED LED
Total harmonic distortion THD B CT T Crosstalk CT B VNO T Output noise voltage VNO B LED current ILED
No. 5652-2/13
LA2650 Control Data for the Parameters in the Electrical Characteristics
Parameter Quiescent current ICCOT Boost: on ICCOB Boost: off Voltage gain VIN = 0 dBm VG T Boost: off VG B Boost: on Boost level: high Boost level: low Maximum output voltage Boost: on, fi = 50 Hz, BST = 35 dB, ADD = 0 dB Boost: on, fi = 50 Hz, BST = 30 dB, ADD = -6 dB THD = 1% L H L H L H L H L H L H L L L H VO maxT Boost: off VO maxB Boost: on Total harmonic distortion VIN = -10 dBm L H L H L H L H L H L H L L L H THD T Boost: off, BPF = 400 Hz to 30 kHz THD B Boost: on, fi = 50 Hz, LPF = 30 kHz Crosstalk VO = 0 dBm, Rg = 10 k, DIN AUDIO CT T Boost: off CT B Boost: on Output noise voltage Rg = 10 k, JIS A VNO T Boost: off, Boost ADD = off VNO B Boost: on LED current ILED RED LED * * * * * * H * *=don't care L H L H L H L H L H L H L L L H L H L H L H L H L H L H L L L H L H H H L H H L L H H H L H H L L H H H L H H H L L L L L H H H L H L H L H L H L H L H L L L H Conditions D1 D2 D3 D4 D5 D6 D7 D8
No. 5652-3/13
LA2650 Block Diagram
DC-CUT VCA NF
DC-CUT VCA NF
DECODER
Test Circuit
5 to 10 V
DECODER
No. 5652-4/13
LA2650 Sample Application Circuit
DC-CUT
VCA NF
5 to 10 V
DECODER
No. 5652-5/13
LA2650 Notes on LA2650 Operation LPF cutoff frequency Use the following formula to calculate the cutoff frequency: * fc = 1/(2CR) Hz However: R = 50 k, since the resistor is on chip. Thus the cutoff frequency can be set by the external capacitor. Example: C = 0.039 F (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) = +4 x 20 log10 (1 + 42f2C2R2)-1/2 + Here, = Boost gain (20, 25, 30, or 35 dB) = Addition level (0, -3, -6, -9, -15, -20, -25, or -35 dB) f: Frequency C: The LPF external capacitor R = 50 k (built in) Example: When = 35 dB, = 0 dB, f = 50 Hz, C = 0.039 F (As in the application circuit) GB = 29.46 dB Pin Functions
Pin No. 1 20 IN-L IN-R Pin Pin voltage (V) 1/2 VCC Signal input pin The input impedance is 50 k Pin function Equivalent circuit
2
BOOST ON/OFF SMOOTHING
0.7 to 2
Smoothing pin for boost on/off switching
3 4 5
ENABLE DATA CLOCK
Apply either 0 or 5 V.
Serial control data input pins
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
VCC max.
LED cathode Influx current: 20 mA (maximum)
Continued on next page. No. 5652-6/13
LA2650
Continued from preceding page.
Pin No. 9 Pin BASS-OUT Pin voltage (V) 1/2 VCC Pin function Low boost output for 3D systems Equivalent circuit
10 11
OUT-R OUT-L
1/2 VCC
Signal outputs
12 13 19
LPF4 LPF3 LPF1
1/2 VCC
LPF connection for the low-boost circuit Internal resistor: 50 k
15
VCA NF
1/2 VCC
VCA feedback
16
LPF2
1/2 VCC
LPF connection for the low-boost circuit Internal resistor: 50 k
17
DC-CUT
1/2 VCC
Connection for DC-cut capacitor
18
VREFIN
1/2 VCC
VREF amplifier reference
Note: Pin voltage values are typical values.
No. 5652-7/13
LA2650 External Components * C1, C15 (0.22 to 10 F) 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 F) 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 F) Detection capacitor. The attack and recover times can be adjusted by changing the value of this capacitor. * C4, C5, C6 (0.22 to 10 F) Output coupling capacitors. * C7, C8, C11, C14 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 F) Power supply capacitor. * C10 (1.0 to 22 F) 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 F) 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 F) RF reference LPF capacitor. The RF SVRR can be modified by changing the value of this capacitor. * R1 (200 k to 3.9 M) 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 k) LED current adjustment. LED current (VCC - VLED - 0.9)/(R2 + 300) The maximum LED current is 20 mA.
No. 5652-8/13
LA2650 Control Format
Data
Add Level Select
D1, D2, D3 H, H, H H, H, L H, L, H H, L, L L, H, H L, H, L L, L, H L, L, L Add level 0 dB -3 dB -6 dB -9 dB -15 dB -20 dB -25 dB -35 dB Initial setting for the VCC on time Notes
Boost Gain Select
D4, D5 H, H H, L L, H L, L Boost gain 35 dB 30 dB 25 dB 20 dB Initial setting for the VCC on time Notes
Left and right channel boost add on/off
L D6 off H on
LED on/off
L D7 off H on
Boost on/off
L D8 off H on
Note: The VCC on time and all other data is initialized to low.
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.
No. 5652-9/13
LA2650 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
Enable
Data
Clock
-- 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.
At least 10 s
Enable
* 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
Timing characteristics Enable clock delay time Data clock delay time Clock high-level hold time Clock low-level hold time Clock enable delay time Clock cycle time tec tdc tch tcl tce tck min 5 5 5 5 5 10 typ max unit s s s s s s Clock tec tch tcl tck tdc Data Enable
tce
No. 5652-10/13
LA2650
Quiescent current, ICCO - mA
Supply voltage, VCC, - V
Output voltage, VO - dB
Input frequency, fi - Hz
Output voltage, VO - dB
Output voltage, VO - dB
Input frequency, fi - Hz
Input frequency, fi - Hz
Filter: 80 kHz LPF
Input frequency, fi - Hz
Input frequency, fi - Hz
Total harmonic distortion, THD - % crosstalk, CT - dB
Output voltage, VO - dB
I/O C = 1 F
Filter: flat
LR R L is identical.
Input voltage, VIN - dBm
Input frequency, fi - Hz
No. 5652-11/13
Total harmonic distortion, THD - %
Output voltage, VO - dB
Output voltage, VO - dB
LA2650
RL = 10 k I/O C = 1 F
Supply voltage, VCC - V
With no LED series resistor
Supply voltage, VCC - V
Current drain, ILED - mA
Crosstalk, CT - dB
I/O C = 1 F Rg = 10 k
LR R L is identical.
Supply voltage, VCC - V
Input frequency, fi - Hz
I/O C = 1 F Rg = 10 k
Maximum output voltage, VOmax - V
Output noise voltage, VNO - dBm
I/O C = 1 F THD = 1%
Supply voltage, VCC - V
Supply voltage, VCC - V
Total harmonic distortion, THD - %
Input C = 1 F
Input frequency, fi - Hz
Voltage gain, VG - dB
Input C = 1 F
Input frequency, fi - Hz
No. 5652-12/13
Total harmonic distortion, THD - %
Output noise voltage, VNO - dB
Output voltage, VO - dBm
LA2650
Total harmonic distortion, THD - %
Input C = 1 F
Voltage gain, VG - dB
Input C = 1 F
Supply voltage, VCC - V
Input voltage, VIN - dBm
s 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. s Anyone purchasing any products described or contained herein for an above-mentioned use shall: 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: 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. s 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. This catalog provides information as of May, 1997. Specifications and information herein are subject to change without notice. No. 5652-13/13

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