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LMH6678 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LMH6678 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
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11 / 17 page  Application Notes FUNCTIONAL DESCRIPTION The LMH6678 contains two pairs of high speed/high output current operational amplifiers configured as two amplifiers differential inputs and outputs, as shown in Figure 1. Quies- cent current can be set independently for each channel via two control bits as depicted in table 1. Also, quiescent cur- rent can be continuously varied by selection of an external resistor between the ADJ pin and a supply voltage of either +12V or +3.3V. TABLE 1. Power Mode Logic Control Channel A (B) Power Mode B01 (B02) B11 (B12) Full Power LL 2/3 Power HL 1/3 Power LH Shutdown HH Channel A and B are set independently. Two supply voltages are required, +12V ±10% and +3.3V ±10%. Current for the driver amplifiers, including their output current, flows from the 12V analog V CC (AVCC) supply and Analog Ground (AGND.) For proper output swing and distor- tion performance, both AV CC pins must be connected to +12V and the exposed metal pad must be soldered to ground potential as described in the layout section. Both AV DD and DVDD pins must be connected to +3.3V. The internal bias circuitry is powered from AV DD and AGND while the digital circuitry and charge pump are powered from DV DD and DGND. This allows separate bypassing and decoupling for AV DD and DVDD. All supply voltage pins need a 0.1 µF ceramic capacitor in parallel with a 4.7 µF capacitor as bypass capacitors. The 0.1 µF capacitor should be as close as possible to the supply voltage pin and the larger capacitor placed next to it. The LMH6678 delivers very low power consumption at a single +12V analog supply voltage by a combination of its circuit architecture and the on-chip dual charge pump. The output stage is an emitter-follower type, which can provide low distortion, low quiescent current and high peak output currents. The charge pumps generate two internal dc voltages, V HIGH = +15V and V LOW = −3V. As shown in Figure 2,VHIGH and V LOW supply base currents for the output stages. This en- ables the drivers to swing within a V CE(sat) of VCC and ground, giving the LMH6678 its high swing of +11.5 V PP into a31 Ω load. 20084041 FIGURE 1. Functional Block Diagram www.national.com 11 |
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