LM6211MF National Semiconductor, LM6211MF Datasheet - Page 15

• Manufacturer Part Number: LM6211MF
• Description: IC,Operational Amplifier,SINGLE,CMOS,TSOP,5PIN,PLASTIC
• Manufacturer: National Semiconductor

Specifications of LM6211MF

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Typical Applications
DAC OUTPUT AMPLIFIER
Op amps are often used to improve a DAC’s output driving
capability. High performance op amps are required as I-V
converters at the outputs of high resolution current output
DACs. Since most DACs operate with a single supply of 5V,
a rail-to-rail output swing is essential for this application. A
low offset voltage is also necessary to prevent offset errors in
the waveform generated. Also, the output impedance of
DACs is quite high, more than a few kΩ in some cases, so it
is also advisable for the op amp to have a low input bias
current. An op amp with a high input impedance also pre-
vents the loading of the DAC, and hence, avoids gain errors.
The op amp should also have a slew rate which is fast
enough to not affect the settling time of the DAC output.
The LM6211, with a CMOS input stage, ultra low input bias
current, a wide bandwidth (20 MHz) and a rail-to-rail output
swing for a supply voltage of 24V is an ideal op amp for such
an application. Figure 9 shows a typical circuit for this appli-
cation. The op amp is usually expected to add another time
constant to the system, which worsens the settling time, but
the wide bandwidth of the LM6211 (20 MHz) allows the
(Continued)
FIGURE 8. Hydraulic Pressure Monitoring System
15
system performance to improve without any significant deg-
radation of the settling time.
FIGURE 9. DAC Driver Circuit
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