Bass Amplifier MM1124 MITSUMI Bass Amplifier Monolithic IC MM1124 Outline This IC was developed to boost bass on TV and free-standing VCR decks, etc. The recent trend toward large-screen TV and movie software has increased the demand for powerful bass and wider sound, so that the bass boost function has become part of TV and VCR functions. This IC was designed especially for bass, and easily reproduces a powerful sound. Features 1. Dynamic bass boost Boost can be adjusted higher for lower sound, and smaller for bigger sound. 2. Boost switching pin Boost amount can be switched for music and video software, giving a change to the set 3. High range boost By boosting the high range as well, a more realistic sound is reproduced 4. Boost attack circuit Gives quick response and follows sudden volume changes Package SOP-16B (MM1124AF, MM1124BF, MM1124CF) DIP-16B (MM1124AD, MM1124BD) Series Table Model name Boost Boost start FULL 1/2 input level MM1124A 19dB 14dB +3dBm MM1124B 12dB 8dB +3dBm MM1124C 8dB 4dB -14dBm Note 1 : Boost amounts for are input level of -37.8dBm Note 2 : The above are reference values, and may vary depending on the specifications. Absolute Maximum Ratings (Ta=25°C) Item Symbol Ratings Units Storage temperature TSTG -40~+125 °C Operating temperature TOPR -20~+70 °C Power supply voltage VCC max. -0.3~+15 V Operating voltage VCC +5~+12 V Allowable loss Pd 350 (SOP-16B) 1200 (DIP-16B) mW Bass Amplifier MM1124 MITSUMI Electrical Characteristics Item (Ta=25°C) Rank Measurement conditions SW f (Hz) VIN (dBm) Consumption current FULL 1k -7.8 Voltage gain Through 1k -7.8 A FULL 100 B FULL C Min. Typ. Max. Units 6.6 9.0 mA -1 0 +1 dB -37.8 17 19 21 dB 100 -37.8 10 12 14 dB FULL 100 -37.8 6 8 10 dB A 1/2 100 -37.8 Bst1-6 Bst1-5 Bst1-4 dB B 1/2 100 -37.8 Bst1-5 Bst1-4 Bst1-3 dB C 1/2 100 -37.8 Bst1-5 Bst1-4 Bst1-3 dB FULL 1k -7.8 0.1 0.3 % 1/2 1k -7.8 0.1 0.3 % Through 1k -7.8 0.03 0.1 % Crosstalk FULL 1k -7.8 -50 -44 dB Maximum output voltage FULL THD=10% FULL VIN=0V, 30kHzLPF 250 500 µVrms Rg=10kΩ 25 50 µVrms -32 -26 dB Superimpose VR=0dB -48 -42 dB FULL (100Hz, 100mVrms) on -36 -30 dB Through VCC and measure output -48 -42 dB pin -42 -34 dB -56 -48 dB Boost 1 (Bst1) Boost 2 Total harmonic distortion ratio Output noise voltage Through A Ripple rejection rate B C SW pin voltage range 1.8 FULL Through FULL Through 2.4 Vrms FULL 1k -7.8 0 0.3 V 1/2 1k -7.8 1.2 1.6 V Through 1k -7.8 2.5 9 V Note : No rank indication means common rank Bass Amplifier MM1124 MITSUMI Block Diagram/ Application Circuits Characteristics Boost amount (dB) Boost amount-Input level (rank A) 20 15 10 SW:FULL SW:1/2 5 0 -5 -10 -50 -40 -30 -20 -10 0 10 Input level (dB) Output level (dBm) Output level-Frequency (rank A) SW : FULL 10 0 -2.2dBm -10 -7.8dBm -20 -30 -37.8dBm -40 101 102 103 Frequency (Hz) 104 105 Bass Amplifier MM1124 MITSUMI Boost amount (dB) Boost amount-Input level (rank B) 20 15 SW:FULL 10 5 SW:1/2 0 -5 -10 -50 -40 -30 -20 -10 0 10 Input level (dB) Output level (dBm) Output level-Frequency (rank B) SW : FULL 10 0 -2.2dBm -10 -7.8dBm -20 -30 -37.8dBm -40 101 102 103 104 105 Frequency (Hz) Boost amount (dB) Boost amount-Input level (rank C) 20 15 10 SW:FULL 5 0 SW:1/2 -5 -10 -50 -40 -30 -20 -10 0 10 Input level (dB) Output level (dBm) Output level-Frequency (rank C) SW : FULL 10 0 -2.2dBm -10 -7.8dBm -20 -30 -37.8dBm -40 101 102 103 Frequency (Hz) 104 105 Bass Amplifier MM1124 MITSUMI THROUGH distortion rate characteristics (VCC=9V, f=1kHz) 101 (%) 100 10-1 10-2 -30 -20 -10 0 10 Input level (dBm) CH Crosstalk -30 (dB) -40 -50 Rank A Rank B Rank C -60 -70 101 102 103 Frequency (Hz) 104 105