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PDF LM6142 Data sheet ( Hoja de datos )
| Número de pieza | LM6142 | |
| Descripción | High Speed/Low Power 17 MHz Rail-to-Rail Input-Output Operational Amplifiers | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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1. LM6142  Hay una vista previa y un enlace de descarga de LM6142 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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May 1999
LM6142 Dual and LM6144 Quad
High Speed/Low Power 17 MHz Rail-to-Rail Input-Output
Operational Amplifiers
General Description
Using patent pending new circuit topologies, the LM6142/44
provides new levels of performance in applications where
low voltage supplies or power limitations previously made
compromise necessary. Operating on supplies of 1.8V to
over 24V, the LM6142/44 is an excellent choice for battery
operated systems, portable instrumentation and others.
The greater than rail-to-rail input voltage range eliminates
concern over exceeding the common-mode voltage range.
The rail-to-rail output swing provides the maximum possible
dynamic range at the output. This is particularly important
when operating on low supply voltages.
High gain-bandwidth with 650 µA/Amplifier supply current
opens new battery powered applications where previous
higher power consumption reduced battery life to unaccept-
able levels. The ability to drive large capacitive loads without
oscillating functionally removes this common problem.
Features
At VS = 5V. Typ unless noted.
n Rail-to-rail input CMVR −0.25V to 5.25V
n Rail-to-rail output swing 0.005V to 4.995V
n Wide gain-bandwidth: 17 MHz at 50 kHz (typ)
n Slew rate:
Small signal, 5V/µs
Large signal, 30V/µs
n Low supply current 650 µA/Amplifier
n Wide supply range 1.8V to 24V
n CMRR 107 dB
n Gain 108 dB with RL = 10k
n PSRR 87 dB
Applications
n Battery operated instrumentation
n Depth sounders/fish finders
n Barcode scanners
n Wireless communications
n Rail-to-rail in-out instrumentation amps
Connection Diagrams
8-Pin CDIP
8-Pin DIP/SO
DS012057-14
Top View
Top View
DS012057-1
© 1999 National Semiconductor Corporation DS012057
www.national.com
1 page  
2.7V DC Electrical Characteristics
VU+n/l2e.ssBoOltdhfearcweisleimSitpseacpifpielyd,aAt ltlhLeimteimtspGeuraatruarneteeexdtrefomreTJ = 25˚C, V+ = 2.7V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ to
LM6144AI
LM6144BI
Symbol
Parameter
Conditions
Typ
LM6142AI
LM6142BI
Units
(Note 5)
Limit
Limit
(Note 6)
(Note 6)
VOS Input Offset Voltage
0.4 1.8 2.5 mV
4.3 4.3 max
IB Input Bias Current
150 250 300 nA
526 526 max
IOS Input Offset Current
4 30 30 nA
80 80 max
RIN
CMRR
PSRR
Input Resistance
Common Mode
Rejection Ratio
Power Supply
0V ≤ VCM ≤ 1.8V
0V ≤ VCM ≤ 2.7V
3V ≤ V+ ≤ 5V
128
90
76
79
MΩ
dB
min
Rejection Ratio
VCM
Input Common-Mode
Voltage Range
−0.25
2.95
0
2.7
0 V min
2.7 V max
AV Large Signal
Voltage Gain
RL = 10k
55
V/mV
min
VO Output Swing
RL = 10 kΩ
0.019
0.08
0.112
0.08
0.112
V
max
2.67
2.66
2.66
V
2.25
2.25
min
IS Supply Current
Per Amplifier
510 800 800 µA
880 880 max
2.7V AC Electrical Characteristics
VU+n/l2e.ssBoOltdhfearcweisleimSitpseacpifpielyd,aAt ltlhLeimteimtspGeuraatruarneteeexdtrefomreTJ = 25˚C, V+ = 2.7V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ to
LM6144AI
LM6144BI
Symbol
Parameter
Conditions
Typ
LM6142AI
LM6142BI
Units
(Note 5)
Limit
Limit
(Note 6)
(Note 6)
GBW
Gain-Bandwidth Product
f = 50 kHz
9
MHz
φm Phase Margin
Gm Gain Margin
36
6
Deg
dB
5 www.national.com
5 Page 
LM6142/44 Application Ideas (Continued)
FIGURE 2.
These features allow the LM6142 to drive capacitive loads
as large as 1000 pF at unity gain and not oscillate. The
scope photos (Figure 3 and Figure 4) above show the
LM6142 driving a l000 pF load. In Figure 3, the upper trace
is with no capacitive load and the lower trace is with a 1000
pF load. Here we are operating on ±12V supplies with a 20
Vp-p pulse. Excellent response is obtained with a Cf of l0 pF.
In Figure 4, the supplies have been reduced to ±2.5V, the
pulse is 4 Vp-p and Cf is 39 pF. The best value for the com-
pensation capacitor is best established after the board layout
is finished because the value is dependent on board stray
capacity, the value of the feedback resistor, the closed loop
gain and, to some extent, the supply voltage.
Another effect that is common to all opamps is the phase
shift caused by the feedback resistor and the input capaci-
tance. This phase shift also reduces phase margin. This ef-
fect is taken care of at the same time as the effect of the ca-
pacitive load when the capacitor is placed across the
feedback resistor.
The circuit shown in Figure 5 was used for these scope
photos.
DS012057-6
FIGURE 4.
DS012057-9
FIGURE 3.
DS012057-8
FIGURE 5.
DS012057-10
Typical Applications
FISH FINDER/ DEPTH SOUNDER.
The LM6142/44 is an excellent choice for battery operated
fish finders. The low supply current, high gain-bandwidth and
full rail to rail output swing of the LM6142 provides an ideal
combination for use in this and similar applications.
11 www.national.com
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet LM6142.PDF ] | |
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