LMP2015MF/NOPB National Semiconductor, LMP2015MF/NOPB Datasheet - Page 12

• Manufacturer Part Number: LMP2015MF/NOPB
• Description: IC OP AMP SGL R-R PREC SOT23-5
• Manufacturer: National Semiconductor
• Series: LMP®r

Specifications of LMP2015MF/NOPB

• Amplifier Type: General Purpose
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• Slew Rate: 4 V/µs
• Gain Bandwidth Product: 3MHz
• Current - Input Bias: 3pA
• Voltage - Input Offset: 0.12µV
• Current - Supply: 930µA
• Current - Output / Channel: 17mA
• Voltage - Supply, Single/dual (±): 2.7 V ~ 5.25 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Other names: LMP2015MF; LMP2015MF; LMP2015MFTR

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In terms of the measured output peak-to-peak noise, the fol-
lowing relationship holds between output noise voltage;
e
LMP2015 AS AN ADC DRIVER
The LMP2015 is a great choice for an amplifier stage imme-
diately before the input of an ADC (Analog-to-Digital Con-
verter) as an ADC driver, whether AC or DC coupled. See
Figure 7
portant characteristics:
TABLE 1. Composite Amplifier Measured Performance
n
1000
100
100
500
AV
50
p-p, the closed-loop gain; A
FIGURE 5. Composite Amplifier Configuration
and
200
100
200
100
R1
1k
Ω
Figure
100k
100k
100k
10k
10k
R2
Ω
8. This is because of the following im-
0.67
1.75
2.2
C2
pF
10
8
V
, and −3 dB bandwidth; BW:
MHz
0.98
BW
3.3
2.5
3.1
1.4
(V/μs)
178
174
170
SR
96
64
FIGURE 7. AC Coupled ADC Driver
(mV
en p-p
250
400
20212519
37
70
70
PP
)
(1)
12
It should be kept in mind that in order to minimize the output
noise voltage for a given closed loop gain setting, one could
minimize the overall bandwidth. As can be seen from
tion
bandwidth.
In the case of the inverting configuration, it is also possible to
increase the input impedance of the overall amplifier by rais-
ing the value of R1. This can be done without having to
increase the feedback resistor, R2, to impractical values, by
utilizing a "Tee" network as feedback. See the LMC6442
datasheet (Application Information section) for more details
on this.
A) Very low offset voltage and offset voltage drift over time
and temperature allow a high closed loop gain setting
without introducing any short term or long term errors. For
example, when set to a closed loop gain of 100 as the
analog input amplifier for a 12-bit A/D converter, the over-
1, the output noise has a square root relationship to the
FIGURE 6. Composite Amplifier Configuration
20212521
20212520
Equa-