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| BM7000 Low Power Amplifier Features * * * * * Low quiescent current High power supply ripple rejection Low voltage operation A few of external part required Built in power save switch & mute switch Description The BM7000 is a monolithic integrated circuit and suitable dual amplifier for low power. 10-SSOP Typical Applications * * * * * * Portable compact disk player (DISCMAN) Portable mini disk player (MD) Disc-man MP3 player CD-ROM Other potable compact disk media Fan motor drive 1 BM7000 Pin Assignments MUTE 10 OUTA 9 GND 8 OUTB 7 VCC 6 7000 1 PS 2 INA 3 GND 4 INB 5 REF Pin Definitions Pin Number 1 2 3 4 5 6 7 8 9 10 Pin Name PS INA GND INB REF VCC OUTB GND OUTA MUTE Power Save Switch Signal Input A Signal Ground Signal Input B Reference Voltage Supply Voltage Signal Output B Power Ground Signal Output A Mute On Switch Pin Function Description 2 BM7000 Internal Block Diagram PS 1 POWER SAVE SWITCH CTL MUTE CTL 10 MUTE REF INA 2 9 OUTA 8 REF GND 3 GND REF INB 4 7 OUTB REF 5 REF 6 VCC 3 BM7000 Absolute Maximum Ratings (Ta = 25C) Parameter Maximum Supply Voltage Power Dissipation Operating Temperature Storage Temperature Thermal Resistance Symbol VCC PD TOPR TSTG Tja Value 4.5 300 -20 ~ +75 -55 ~ +125 150 Unit V mW C C C/W Remark Maximum supply voltage Power dissipation Operating temperature Storage temperature - Power Dissipation Curve Power dissipation (mW) 300 150 Ambient temperature, Ta (C) 25 75 125 Recommended Operating Conditions (Ta = 25C) Parameter Operating Supply Voltage Recommended Load Symbol VCC RL Min. 1.8 16 Typ. 3.0 - Max. 4.0 32 Unit V 4 BM7000 Electrical Characteristics (RL = 16, Rg = 600, Ta = 25C) Parameter Quiescent Current 1 Quiescent Current 2 Quiescent Current 3 Close Loop Voltage Gain 1 Close Loop Voltage Gain 2 Channel Balance 1 Channel Balance 2 Total Harmonic Distortion Ripple Rejection Ratio Crosstalk Output Noise Voltage Output Power PS Attenuation Ratio MUTE attenuation ratio PS ON input current MUTE OFF input current PS ON high level MUTE OFF high level Symbol ICC1 ICC2 ICC3 GVC1 GVC1 Conditions VCC = 2.4V VCC = 4.5V, Mute = GND VCC = 4.5V, PS = GND VCC = 2.4V, f = 1KHz, VO = -10dBm VCC = 1.8V, f = 1KHz, VO = -20dBm VCC = 2.4V, f = 1KHz, VO = -10dBm VCC = 1.8V, f = 1KHz, VO = -20dBm VCC = 2.0V, f = 1KHz, PO = 1mW VCC = 1.8V, f = 100Hz, Rg = 1K, VR = -20dBm, BPF = 100Hz VCC = 2.4V, f = 100Hz, Rg = 1K, VO = -10dB VCC = 4.5V, Rg = 1K, BPF = 20Hz ~ 20KHz VCC = 3.0V, f = 1KHz, THD = 10% VCC = 1.8V, f = 100Hz, PS = GND, VIN = -10dB VCC = 1.8V, f = 100Hz, MUTE = GND, VIN = -10dB VCC = 1.5V, VREF 0.85V VCC = 1.5V, VREF 0.85V VCC = 1.5V, VREF 0.85V VCC = 1.5V, VREF 0.85V Min. 30 29 Typ. 5.5 1.0 32 32 0.5 60 50 60 40 0.2 0.2 0.65 0.65 100 -80 -80 1.0 1.0 Max. 10.0 2.0 1.0 34 34 1.0 1.0 1.5 43 43 20 0.5 0.5 dB dB Vrms mW dB dB A A V V Unit mA mA A dB dB dB dB % GV1 GV2 THD RR CT VNOISE POUT ATTPS ATTMU IPSON IMOFF VHPS VHMU 5 BM7000 Application Information 1. PS Block This block diagram describes the power save switch circuits. The drive block is controlled by PS pin, which can be derived from micro controller. It controls bias of the internal circuits of BM7000, so that it makes BM7000 operate when input voltage level reaches high level. 2. Mute Block The block diagram describes the mute on switch circuits. The drive block is controlled by MUTE pin, which can be derived from micro controller. When the pin of mute turns on, it makes reference voltage of internal circuits approximately 0V, so that it keeps the device of BM7000 off. 3. AMP Block This block diagram describes the AMP block with resistances, which control gain of BM7000. The gain of BM7000 is V OUT -------------- 40 32 [ dB ] V IN Output voltage of BM7000 can be 40 times as much as input voltage, so it eliminates the number of external circuits and offers headphone input. 4. Popping Noise Reduction If PS pin (Pin1 , Power save switch) connect the micro controller, the micro controller must follow the same sequence 1 in order to reduce popping noise on mute mode. PS on Mute on PS off Mute operation PS on Mute off Normal operation (Sequence 1) If PS connect VCC, the micro controller follow the sequence 2. Mute on Mute Operation Mute off Normal operation (Sequence 2) 6 BM7000 Test Circuits I1 1 2 3 1 2 V1 4.7 Rg 1 4 2 22u Rg + I10 2 1 4 PS MUTE 10 4 3 220u 2 INA OUTA 9 0.1u V10 + RL 16 3 GND 7000 GND 8 4.7 0.1u RL 16 RIPPLE DC 220u 4.7u + + INB OUTB 7 5 REF VCC 6 A 7 BM7000 Typical Application Circuits ON 1 OFF 2 VR INA OUTA 9 PS MUTE 10 OFF ON 0.1u 220u L-CH 4.7 3 GND 7000 GND 8 4.7 220u R-CH + + + 4.7u + 0.1u 4 VR 22u + 4.7u INB OUTB 7 Sg1 Sg2 4.7u 5 REF VCC 6 + VDC To make output wave largest , add an 91K resistor between pin6 and pin5 8 BM7000 Package Dimensions 10-SSOP 9 |
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