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 Features unit: mm • 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. 3021B-DIP20 [LA2650] 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 = 25°C Parameter Maximum supply voltage Symbol Conditions Ratings VCC max Allowable power dissipation Pd max Ta ≤ 70°C Unit 12 V 450 mW Operating temperature Topr –25 to +70 °C Storage temperature Tstg –40 to +150 °C Operating Conditions at Ta = 25°C Parameter Recommended supply voltage Operating voltage range Symbol Conditions Ratings VCC VCC op Unit 9 V 5 to 10 V Control Data Input Voltage Levels Parameter Symbol Conditions Ratings Unit Low-level voltage VIL 0 to 1.5 V High-level voltage VIH 3.5 to *5.5 V Note: When VCC is under 5.7 V, the maximum value shall be VCC – 0.2 V. 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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 = 25°C, VCC = 9 V, fi = 1 kHz, RL = 10 kΩ, BST = 35 dB, ADD = 0 dB, BST:ADD = ON Parameter Quiescent current Voltage gain Symbol Maximum output voltage typ Unit max ICCOT Boost: off 5 8 13 mA Boost: on 6 9 14 mA VGT VIN = 0 dBm, Boost: off –2 0 +2 dB VGB VIN = 0 dBm, Boost: on –2 0 +2 dB BST1 Boost: on, fi = 50 Hz, BST = 35 dB, ADD = 0 dB, VIN = –30 dBm 25.5 28.5 31.5 dB BST2 Boost: on, fi = 50 Hz, BST = 35 dB, ADD = 0 dB, VIN = –20 dBm 21 24 27 dB BST3 Boost: on, fi = 50 Hz, BST = 35 dB, ADD = 0 dB, VIN = –10 dBm 13 15 17 dB BST4 Boost: on, fi = 50 Hz, BST = 35 dB, ADD = 0 dB, VIN = 0 dBm 5 7 9 dB BST1 Boost: on, fi = 50 Hz, BST = 30 dB, ADD = –6 dB, VIN = –20 dBm 15 18 21 dB BST2 Boost: on, fi = 50 Hz, BST = 30 dB, ADD = –6 dB, VIN = –10 dBm 8 10 12 dB BST3 Boost: on, fi = 50 Hz, BST = 30 dB, ADD = –6 dB, VIN = 0 dBm 1.5 3.5 5.5 dB VO maxT THD = 1%, Boost: off 2.00 2.55 V VO maxB THD = 1%, Boost: on 2.00 2.55 V THD T VIN = –10 dBm, Boost: off, BPF = 400 Hz to 30 kHz THD B VIN = –10 dBm, Boost: on, fi = 50 Hz, LPF = 30 kHz CT T VO = 0 dB, Rg = 10 kΩ, DIN AUDIO, Boost: off 80 88 dB CT B VO = 0 dB, Rg = 10 kΩ, DIN AUDIO, Boost: on 50 59 dB VNO T Rg = 10 kΩ, JIS A, Boost: off, Boost ADD = off VNO B Rg = 10 kΩ, JIS A, Boost: on Total harmonic distortion Crosstalk Output noise voltage LED current Ratings min ICCOB Boost level: high Boost level: low Conditions ILED RED LED 11 0.008 0.03 % 0.3 0.9 % –97 –90 dBm –91 –84 dBm 15 19 mA No. 5652-2/13 LA2650 Control Data for the Parameters in the Electrical Characteristics Parameter Conditions D1 D2 D3 D4 D5 D6 D7 D8 Quiescent current ICCOT Boost: on L L L L L L L L ICCOB Boost: off H H H H H H L H Voltage gain VIN = 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, fi = 50 Hz, BST = 35 dB, ADD = 0 dB H H H H H H L H Boost level: low Boost: on, fi = 50 Hz, BST = 30 dB, ADD = –6 dB H L H L H H L H Maximum output voltage THD = 1% VO maxT Boost: off L L L L L L L L VO maxB Boost: on H H H H H H L H Total harmonic distortion VIN = –10 dBm THD T Boost: off, BPF = 400 Hz to 30 kHz L L L L L L L L THD B Boost: on, fi = 50 Hz, LPF = 30 kHz H H H H H H L H Crosstalk Output noise voltage VO = 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 Rg = 10 kΩ, JIS A VNO T Boost: off, Boost ADD = off L L L L L L L L VNO B Boost: on H H H H H H L H ILED RED LED * * * * * * H LED current * *=don’t care No. 5652-3/13 LA2650 VCA NF DC-CUT Block Diagram DECODER VCA NF DC-CUT Test Circuit 5 to 10 V DECODER No. 5652-4/13 LA2650 VCA NF DC-CUT Sample Application Circuit 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/(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 Pin Functions Pin No. Pin 1 IN-L 20 IN-R 2 BOOST Pin voltage (V) 1/2 VCC Pin function Equivalent circuit Signal input pin The input impedance is 50 kΩ 0.7 to 2 Smoothing pin for boost on/off switching Apply either 0 or 5 V. Serial control data input pins ON/OFF SMOOTHING 3 ENABLE 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 VCC max. LED cathode Influx current: 20 mA (maximum) Continued on next page. No. 5652-6/13 LA2650 Continued from preceding page. Pin No. Pin Pin voltage (V) Pin function 9 BASS-OUT 1/2 VCC Low boost output for 3D systems 10 OUT-R 1/2 VCC Signal outputs 11 OUT-L 12 LPF4 13 LPF3 19 LPF1 15 VCA NF 1/2 VCC VCA feedback 16 LPF2 1/2 VCC LPF connection for the low-boost circuit 1/2 VCC Equivalent circuit LPF connection for the low-boost circuit Internal resistor: 50 kΩ Internal resistor: 50 kΩ 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 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, 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 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 – 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 Add level H, H, H 0 dB H, H, L –3 dB H, L, H –6 dB Notes 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 VCC on time Boost gain Notes Boost Gain Select D4, D5 H, H 35 dB H, L 30 dB L, H 25 dB L, L 20 dB Initial setting for the VCC on time Left and right channel boost add on/off D6 L H off on LED on/off D7 L H off on Boost on/off D8 L H off 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 µs 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 min typ max unit Enable clock delay time tec 5 µs Data clock delay time tdc 5 µs Clock high-level hold time tch 5 µs Clock low-level hold time tcl 5 µs Clock enable delay time tce 5 µs Clock cycle time tck 10 µs tce Enable Data Clock tdc tec tch tcl tck No. 5652-10/13 Output voltage, VO – dB Quiescent current, ICCO – mA LA2650 Input frequency, fi – Hz Output voltage, VO – dB Output voltage, VO – dB Supply voltage, VCC, – V Output voltage, VO – dB Output voltage, VO – dB Input frequency, fi – Hz Total harmonic distortion, THD – % crosstalk, CT – dB Output voltage, VO – dB Input frequency, fi – Hz I/O C = 1 µF Input voltage, VIN – dBm Filter: 80 kHz LPF Total harmonic distortion, THD – % Input frequency, fi – Hz Input frequency, fi – Hz Filter: flat L→R R → L is identical. Input frequency, fi – Hz No. 5652-11/13 LA2650 Total harmonic distortion, THD – % Output voltage, VO – dBm Output noise voltage, VNO – dB RL = 10 kΩ I/O C = 1 µF Supply voltage, VCC – V Supply voltage, VCC – V Crosstalk, CT – dB Current drain, ILED – mA With no LED series resistor I/O C = 1 µF Rg = 10 kΩ L→R R → L is identical. Input frequency, fi – Hz Maximum output voltage, VOmax – V Output noise voltage, VNO – dBm Supply voltage, VCC – V I/O C = 1 µF Rg = 10 kΩ I/O C = 1 µF THD = 1% Supply voltage, VCC – V Voltage gain, VG – dB Total harmonic distortion, THD – % Supply voltage, VCC – V Input C = 1 µF Input frequency, fi – Hz Input C = 1 µF Input frequency, fi – Hz No. 5652-12/13 Input C = 1 µF Supply voltage, VCC – V Total harmonic distortion, THD – % Voltage gain, VG – dB LA2650 Input C = 1 µF Input voltage, VIN – dBm ■ 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. This catalog provides information as of May, 1997. Specifications and information herein are subject to change without notice. No. 5652-13/13