LME49721MA/NOPB National Semiconductor, LME49721MA/NOPB Datasheet - Page 17

• Manufacturer Part Number: LME49721MA/NOPB
• Description: IC AMP AUDIO STER AB HIFI 8SOIC
• Manufacturer: National Semiconductor

Specifications of LME49721MA/NOPB

• Amplifier Type: Audio
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• Slew Rate: 8.5 V/µs
• Gain Bandwidth Product: 20MHz
• Current - Input Bias: 0.04pA
• Voltage - Input Offset: 300µV
• Current - Supply: 2.15mA
• Current - Output / Channel: 9.7mA
• Voltage - Supply, Single/dual (±): 2.2 V ~ 5.5 V, ±1.1 V ~ 2.75 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Amplifier Class: AB
• No. Of Channels: 2
• Supply Voltage Range: 2.2V To 5.5V
• Load Impedance: 600ohm
• Operating Temperature Range: -40°C To +85°C
• Amplifier Case Style: SOIC
• No. Of Pins: 8
• Rohs Compliant: Yes
• Number Of Channels: 2
• Voltage Gain Db: 130 dB
• Common Mode Rejection Ratio (min): 70 dB
• Input Offset Voltage: 1.5 mV at 5 V
• Operating Supply Voltage: 3 V, 5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• For Use With: LME49721MABD - BOARD EVAL FOR LME49721
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Details
• Other names: LME49721MA

Figure 3 shows the typical connection for a dual supply in-
verting amplifier. The output voltage is centered on zero.
Figure 4 shows the typical connection for the Buffer Amplifier
or also called a Voltage Follower. A Buffer Amplifier can be
used to solve impedance matching problems, to reduce pow-
FIGURE 3. Dual Supply Inverting Op Amp
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er consumption in the source, or to drive heavy loads. The
input impedance of the op amp is very high. Therefore, the
input of the op amp does not load down the source. The output
impedance on the other hand is very low. It allows the load to
either supply or absorb energy to a circuit while a secondary
voltage source dissipates energy from a circuit. The Buffer is
a unity stable amplifier, 1V/V. Although the feedback loop is
tied from the output of the amplifier to the inverting input, the
gain is still positive. Note, if a positive feedback is used, the
amplifier will most likely drive to either rail at the output.
FIGURE 4. Buffer
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