LMC6484AIN/NOPB National Semiconductor, LMC6484AIN/NOPB Datasheet - Page 13

• Manufacturer Part Number: LMC6484AIN/NOPB
• Description: IC OP AMP QUAD CMOS R-R 14-DIP
• Manufacturer: National Semiconductor

Specifications of LMC6484AIN/NOPB

• Amplifier Type: General Purpose
• Number Of Circuits: 4
• Output Type: Rail-to-Rail
• Slew Rate: 1.3 V/µs
• Gain Bandwidth Product: 1.5MHz
• Current - Input Bias: 0.02pA
• Voltage - Input Offset: 110µV
• Current - Supply: 2.6mA
• Current - Output / Channel: 30mA
• Voltage - Supply, Single/dual (±): 3 V ~ 15.5 V, ±1.5 V ~ 7.75 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 14-DIP (0.300", 7.62mm)
• Bandwidth: 1.5 MHz
• Channel Separation: 150
• Common Mode Rejection Ratio: 82
• Current, Input Bias: 0.02 pA
• Current, Input Offset: 0.01 pA
• Current, Output: 30 mA
• Current, Supply: 2 mA
• Harmonic Distortion: 0.01 %
• Impedance, Thermal: 70 °C/W
• Number Of Amplifiers: Quad
• Package Type: MDIP-14
• Resistance, Input: 10 Teraohms
• Temperature, Operating, Range: -40 to +85 °C
• Voltage, Gain: 666 V/mV
• Voltage, Input: 3 to 15.5 V
• Voltage, Noise: 37 nV/sqrt Hz
• Voltage, Offset: 0.11 mV
• Voltage, Output, High: 14.7 V
• Voltage, Output, Low: 0.16 V
• Voltage, Supply: 5 V
• Number Of Channels: 4
• Voltage Gain Db: 116.47 dB
• Common Mode Rejection Ratio (min): 70 dB
• Input Offset Voltage: 0.75 mV at 5 V
• Operating Supply Voltage: 5 V, 9 V, 12 V, 15 V
• Supply Current: 2.8 mA at 5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device
• Other names: *LMC6484AIN; *LMC6484AIN/NOPB; LMC6484AIN

Application Information
of the ultra-low input current of the LMC6484, typically less
than 20 fA, it is essential to have an excellent layout. Fortu-
nately, the techniques of obtaining low leakages are quite
simple. First, the user must not ignore the surface leakage of
the PC board, even though it may sometimes appear accept-
ably low, because under conditions of high humidity or dust
or contamination, the surface leakage will be appreciable.
To minimize the effect of any surface leakage, lay out a ring
of foil completely surrounding the LMC6484’s inputs and the
terminals of capacitors, diodes, conductors, resistors, relay
terminals, etc. connected to the op-amp’s inputs, as in Fig-
ure 9 . To have a significant effect, guard rings should be
placed in both the top and bottom of the PC board. This PC
foil must then be connected to a voltage which is at the same
voltage as the amplifier inputs, since no leakage current can
flow between two points at the same potential. For example,
a PC board trace-to-pad resistance of 10
mally considered a very large resistance, could leak 5 pA if
the trace were a 5V bus adjacent to the pad of the input. This
would cause a 250 times degradation from the LMC6484’s
actual performance. However, if a guard ring is held within 5
mV of the inputs, then even a resistance of 10
cause only 0.05 pA of leakage current. See Figure 10 for
typical connections of guard rings for standard op-amp
configurations.
FIGURE 9. Example of Guard Ring in P.C. Board
Layout
(Continued)
12
, which is nor-
11
DS011714-20
would
13
The designer should be aware that when it is inappropriate
to lay out a PC board for the sake of just a few circuits, there
is another technique which is even better than a guard ring
on a PC board: Don’t insert the amplifier’s input pin into the
board at all, but bend it up in the air and use only air as an in-
sulator. Air is an excellent insulator. In this case you may
have to forego some of the advantages of PC board con-
struction, but the advantages are sometimes well worth the
effort
See Figure 11 .
(Input pins are lifted out of PC board and soldered directly to components.
All other pins connected to PC board.)
FIGURE 10. Typical Connections of Guard Rings
of
using
Non-Inverting Amplifier
FIGURE 11. Air Wiring
Inverting Amplifier
point-to-point
Follower
up-in-the-air
DS011714-23
DS011714-21
www.national.com
DS011714-22
DS011714-24
wiring.