5962-9761301QXA [NSC]
Dual Micropower Rail-to-Rail Output Single Supply Operational Amplifier; 双路微功耗轨至轨输出单电源运算放大器
| 型号： | 5962-9761301QXA |
| 厂家： | 
National Semiconductor |
| 描述： | Dual Micropower Rail-to-Rail Output Single Supply Operational Amplifier |
| 文件： | 总16页 (文件大小：1002K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
August 2000
LMC6442
Dual Micropower Rail-to-Rail Output Single Supply
Operational Amplifier
General Description
Features
The LMC6442 is ideal for battery powered systems, where
very low supply current (less than one microamp per ampli-
fier) and Rail-to-Rail output swing is required. It is character-
ized for 2.2V to 10V operation, and at 2.2V supply, the
LMC6442 is ideal for single (Li-Ion) or two cell (NiCad or
alkaline) battery systems.
(Typical, VS = 2.2V)
n Output Swing to within 30 mV of supply rail
n High voltage gain
n Gain Bandwidth Product
n Guaranteed for:
n Low Supply Current
n Input Voltage Range
n 2.1 µW/Amplifier
103 dB
9.5 KHz
2.2V, 5V, 10V
0.95 µA/Amplifier
−0.3V to V+ -0.9V
Power consumption
The LMC6442 is designed for battery powered systems that
require long service life through low supply current, such as
smoke and gas detectors, and pager or personal communi-
cations systems.
n Stable for AV ≥+2 or AV ≤ −1
Operation from single supply is enhanced by the wide com-
mon mode input voltage range which includes the ground (or
negative supply) for ground sensing applications. Very low
(5fA, typical) input bias current and near constant supply
current over supply voltage enhance the LMC6442’s perfor-
mance near the end-of-life battery voltage.
Applications
n Portable instruments
n Smoke/gas/CO/fire detectors
n Pagers/cell phones
n Instrumentation
Designed for closed loop gains of greater than plus two (or
minus one), the amplifier has typically 9.5 KHz GBWP (Gain
Bandwidth Product). Unity gain can be used with a simple
compensation circuit, which also allows capacitive loads of
up to 300 pF to be driven, as described in the Application
Notes section.
n Thermostats
n Occupancy sensors
n Cameras
n Active badges
For compact assembly the LMC6442 is available in the
MSOP 8 pin package, about one half the size required by the
SOIC 8 pin package. 8 pin DIP and 8 pin SOIC are also
available.
Connection Diagram
10006440
Top View
© 2004 National Semiconductor Corporation
DS100064
www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Junction Temp. (Note 4)
150˚C
Operating Ratings(Note 1)
Supply Voltage
1.8V ≤ VS ≤ 11V
ESD Tolerance (Note 2)
2 kV
<
<
Junction Temperature
−40˚C TJ +85˚C
Differential Input Voltage
Supply Voltages
Range: LMC6442AI, LMC6442I
Voltage at Input/Output Pin
Supply Voltage (V+ − V−):
Current at Input Pin (Note 10)
Current at Output Pin(Notes 3, 7)
Lead Temp. (soldering 10 sec)
Storage Temp. Range:
(V+) + 0.3V, (V−) − 0.3V
Thermal Resistance (θJA
)
16V
5 mA
M Package, 8-pin Surface
Mount
193˚C/W
30 mA
MSOP Package
235˚C/W
115˚C/W
260˚C
N Package, 8-pin Molded DIP
−65˚C to +150˚C
2.2V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 2.2V, V− = 0V, VCM = VO = V +/2, and RL = 1 MΩ to V+/2.
Boldface limits apply at the temperature extremes.
LMC6442AI
Limit
(Note 6)
LMC6442I
Limit
(Note 6)
Typ
(Note 5)
Symbol
Parameter
Conditions
Units
DC Electrical Characteristics
VOS
TCVOS
IB
Input Offset Voltage
3
7
mV
−0.75
0.4
4
8
max
Temp. coefficient of
input offset voltage
Input Bias Current
µV/˚C
(Note 14)
(Note 14)
pA
max
pA
0.005
4
2
4
2
Input Offset Current
IOS
0.0025
92
max
dB min
CMRR
Common Mode
Rejection Ratio
Common Mode Input
Capacitance
−0.1V ≤ VCM ≤0.5V
67
67
67
67
CIN
4.7
95
pF
PSRR
VCM
Power Supply
VS = 2.5 V to 10V
75
75
75
75
dB
min
V
Rejection Ratio
Input Common-Mode
Voltage Range
1.05
0.95
−0.2
0
1.05
0.95
−0.2
0
1.3
min
V
CMRR ≥ 50 dB
−0.3
max
AV
VO
Large Signal Voltage
Gain
Sourcing (Note 11)
Sinking(Note 11)
100
94
dB
min
VO = 0.22V to 2V
103
80
2.15
2.15
60
80
2.15
2.15
60
Output Swing
VID = 100 mV (Note 13)
V
2.18
22
min
mV
max
VID = −100 mV (Note 13)
60
60
ISC
Output Short Circuit
Current
Sourcing, VID = 100 mV
(Notes 12, 13)
50
50
18
18
17
17
µA
min
Sinking, VID = −100 mV
(Notes 12, 13)
20
20
19
19
IS
Supply Current (2
amplifiers)
RL = open
1.90
2.10
2.2
2.4
3.0
2.6
3.2
µA
max
V+ = 1.8V, RL = open
AC Electrical Characteristics
SR
Slew Rate (Note 8)
V/ms
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2
2.2V Electrical Characteristics (Continued)
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 2.2V, V− = 0V, VCM = VO = V +/2, and RL = 1 MΩ to V+/2.
Boldface limits apply at the temperature extremes.
LMC6442AI
Limit
(Note 6)
LMC6442I
Limit
(Note 6)
Typ
(Note 5)
Symbol
GBWP
φm
Parameter
Conditions
Units
KHz
Gain-Bandwidth
Product
9.5
63
Phase Margin
(Note 15)
Degree
5V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VCM = VO = V +/2, and RL = 1 MΩ to V+/2.
Boldface limits apply at the temperature extremes.
LMC6442AI
Limit
(Note 6)
LMC6442I
Limit
(Note 6)
Typ
(Note 5)
Symbol
Parameter
Conditions
Units
DC Electrical Characteristics
VOS
TCVOS
IB
Input Offset Voltage
3
7
mV
max
−0.75
0.4
4
8
Temp. coefficient of
input offset voltage
Input Bias Current
µV/˚C
(Note 14)
(Note 14)
pA
max
pA
0.005
4
2
4
2
Input Offset Current
IOS
0.0025
102
max
dB
CMRR
Common Mode
Rejection Ratio
Common Mode Input
Capacitance
−0.1V ≤ VCM ≤3.5V
70
70
70
70
min
pF
CIN
4.1
95
PSRR
VCM
Power Supply
VS = 2.5 V to 10V
75
75
75
75
dB
min
V
Rejection Ratio
Input Common-Mode
Voltage Range
3.85
3.75
−0.2
0
3.85
3.75
−0.2
0
4.1
min
V
CMRR ≥ 50 dB
−0.4
max
AV
VO
Large Signal Voltage
Gain
Sourcing (Note 11)
Sinking (Note 11)
VO = 0.5V to 4.5V
VID = 100 mV
100
94
dB
min
103
4.99
80
4.95
4.95
50
80
4.95
4.95
50
Output Swing
V
(Note 13)
min
mV
max
VID = −100 mV
(Note 13)
20
50
50
ISC
Output Short Circuit
Current
Sourcing, VID = 100 mV
(Notes 12, 13)
Sinking, VID = −100 mV
(Notes 12, 13)
RL = open
500
350
1.90
300
200
200
150
2.4
300
200
200
150
2.6
µA
min
IS
Supply Current (2
amplifiers)
µA
3.0
3.2
max
AC Electrical Characteristics
SR
Slew Rate (Note 8)
Gain-Bandwidth
Product
4.1
10
2.5
2.5
V/ms
KHz
GBWP
φm
Phase Margin
(Note 15)
64
Degree
3
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5V Electrical Characteristics (Continued)
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VCM = VO = V +/2, and RL = 1 MΩ to V+/2.
Boldface limits apply at the temperature extremes.
LMC6442AI
Limit
(Note 6)
LMC6442I
Limit
(Note 6)
Typ
(Note 5)
Symbol
Parameter
Conditions
Units
THD
Total Harmonic
Distortion
AV = +2, f = 100 Hz,
0.08
%
RL = 10MΩ, VOUT = 1 Vpp
10V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 10V, V− = 0V, VCM = VO = V +/2, and RL = 1 MΩ to V+/2.
Boldface limits apply at the temperature extremes.
LMC6442AI
Limit
(Note 6)
LMC6442I
Limit
(Note 6)
Typ
(Note 5)
Symbol
Parameter
Conditions
Units
DC Electrical Characteristics
VOS
TCVOS
IB
Input Offset Voltage
3
7
mV
max
−1.5
0.4
4
8
Temp. coefficient of
input offset voltage
Input Bias Current
µV/˚C
(Note 14)
(Note 14)
pA
max
pA
0.005
4
2
4
2
Input Offset Current
IOS
0.0025
105
max
dB
CMRR
Common Mode
Rejection Ratio
Common Mode Input
Capacitance
−0.1V ≤ VCM ≤8.5V
70
70
70
70
min
pF
CIN
3.5
95
PSRR
VCM
Power Supply
VS = 2.5 V to 10V
75
75
75
75
dB
min
V
Rejection Ratio
Input Common-Mode
Voltage Range
8.85
8.75
−0.2
0
8.85
8.75
−0.2
0
9.1
min
V
CMRR ≥ 50 dB
−0.4
max
AV
VO
Large Signal Voltage
Gain
Sourcing (Note 11)
Sinking (Note 11)
VO = 0.5V to 9.5V
VID = 100 mV
120
100
104
9.99
dB
min
80
9.97
9.97
50
80
9.97
9.97
50
Output Swing
V
(Note 13)
min
mV
max
VID = −100 mV(Note 13)
22
50
50
ISC
Output Short Circuit
Current
Sourcing, VID = 100 mV
(Notes 12, 13)
2100
900
1200
1000
600
500
2.4
1200
1000
600
500
2.6
µA
min
Sinking, VID = −100 mV
(Notes 12, 13)
IS
Supply Current (2
amplifiers)
RL = open
1.90
µA
3.0
3.2
max
AC Electrical Characteristics
SR
Slew Rate(Note 8)
Gain-Bandwidth
Product
4.1
2.5
2.5
V/ms
KHz
GBWP
10.5
φm
Phase Margin
Input-Referred
Voltage Noise
(Note 15)
RL = open
f = 10 Hz
68
Degree
√
nV/ Hz
en
170
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4
10V Electrical Characteristics (Continued)
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 10V, V− = 0V, VCM = VO = V +/2, and RL = 1 MΩ to V+/2.
Boldface limits apply at the temperature extremes.
LMC6442AI
Limit
(Note 6)
LMC6442I
Limit
(Note 6)
Typ
(Note 5)
Symbol
Parameter
Conditions
Units
√
in
Input-Referred
RL = open
f = 10 Hz
(Note 9)
0.0002
85
pA/ Hz
Current Noise
Crosstalk Rejection
dB
Electrical Characteristics (continued)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.
Note 2: Human body model, 1.5 kΩ in series with 100 pF.
Note 3: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the
maximum allowed junction temperature of 150˚C. Output currents in excess of 30 mA over long term may adversely affect reliability.
Note 4: The maximum power dissipation is a function of T
, θ , and T . The maximum allowable power dissipation at any ambient temperature is P = (T
A D J(max)
J(max) JA
- T )/ θ . All numbers apply for packages soldered directly into a PC board.
A
JA
Note 5: Typical Values represent the most likely parametric norm.
Note 6: All limits are guaranteed by testing or statistical analysis unless otherwise specified.
+
+
Note 7: Do not short circuit output to V ,when V is greater than 13V or reliability will be adversely affected.
Note 8: Slew rate is the slower of the rising and falling slew rates.
+
Note 9: Input referred, V = 10V and R = 10 MΩ connected to 5V. Each amp excited in turn with 1 KHz to produce about 10 Vpp output.
L
Note 10: Limiting input pin current is only necessary for input voltages that exceed absolute maximum input voltage ratings.
+
+
+
>
<
V /2. For Sinking tests, V
O
Note 11: R connected to V /2. For Sourcing Test, V
V /2.
L
O
Note 12: Output shorted to ground for sourcing, and shorted to V+ for sinking short circuit current test.
Note 13: V is differential input voltage referenced to inverting input.
ID
Note 14: Limits guaranteed by design.
Note 15: See the Typical Performance Characteristics and Application Notes sections for more details.
Typical Performance Characteristics
VS = 5V, Single Supply, TA = 25˚C unless otherwise
specified
Total Supply Current
vs Supply Voltage
(Negative Input Overdrive)
Total Supply Current
vs Supply Voltage
10006408
10006409
5
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Typical Performance Characteristics VS = 5V, Single Supply, TA = 25˚C unless otherwise
specified (Continued)
Total Supply Current
vs Supply Voltage
(Positive Input Overdrive)
Input Bias Current
vs Temperature
10006410
10006441
Offset Voltage vs
Common Mode Voltage
(VS = 2.2V)
Offset Voltage vs
Common Mode Voltage
(VS = 5V)
10006406
10006407
Offset Voltage vs
Common Mode Voltage
(VS = 10V)
Swing Towards V− vs
Supply Voltage
10006403
10006442
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6
Typical Performance Characteristics VS = 5V, Single Supply, TA = 25˚C unless otherwise
specified (Continued)
Swing Towards V+ vs
Supply Voltage
Swing From Rail(s)
vs Temperature
10006402
10006401
Output Source Current
vs Output Voltage
Output Sink Current
vs Output Voltage
10006449
10006448
Maximum Output Voltage
vs Load Resistance
Large Signal Voltage
Gain vs Supply Voltage
10006452
10006424
7
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Typical Performance Characteristics VS = 5V, Single Supply, TA = 25˚C unless otherwise
specified (Continued)
Open Loop
Open Loop
Gain/Phase vs
Frequency
Gain/Phase vs
Frequency For Various CL
(ZL = 1 MΩ II CL)
10006426
10006419
Open Loop
Gain/Phase vs
Frequency For Various CL
(ZL = 100 KΩ II CL)
Gain Bandwidth Product
vs Supply Voltage
10006421
10006425
Phase Margin
(Worst Case)
vs Supply Voltage
CMRR vs Frequency
10006423
10006434
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8
Typical Performance Characteristics VS = 5V, Single Supply, TA = 25˚C unless otherwise
specified (Continued)
Positive Slew Rate vs
PSRR vs Frequency
Supply Voltage
10006412
10006418
10006433
10006415
Negative Slew Rate vs
Supply Voltage
Cross-Talk Rejection
vs Frequency
10006411
Input Voltage Noise
vs Frequency
Output Impedance
vs Frequency
10006416
9
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Typical Performance Characteristics VS = 5V, Single Supply, TA = 25˚C unless otherwise
specified (Continued)
THD+N vs Frequency
THD+N vs Amplitude
10006428
10006427
Small Signal Step
Response
Maximum Output
Swing vs Frequency
(AV=+2) (CL=12 pF, 100 pF)
10006429
10006453
Large Signal Step
Response
Small Signal Step
Response
(AV=+2) (CL=100 pF)
(AV = − 1) (CL=1MΩ II 100 pF, 200 pF)
10006430
10006451
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10
Typical Performance Characteristics VS = 5V, Single Supply, TA = 25˚C unless otherwise
specified (Continued)
Small Signal Step
Response
Large Signal Step
Response
(AV = + 1) For Various CL
(AV = +1) (CL= 200pF)
10006431
10006432
Closed loop gain, AV is given by:
Applications Information
USING LMC6442 IN UNITY GAIN APPLICATIONS
LMC6442 is optimized for maximum bandwidth and minimal
external components when operating at a minimum closed
loop gain of +2 (or −1). However, it is also possible to
operate the device in a unity gain configuration by adding
external compensation as shown in Figure 1:
10006436
FIGURE 2. “T” Network Used to Replace High Value
Resistor
10006435
It must be noted, however, that using this scheme, the
realizable bandwidth would be less than the theoretical
maximum. With feedback factor, β, defined as:
FIGURE 1. AV = +1 Operation by adding Cc and Rc
Using this compensation technique it is possible to drive
capacitive loads of up to 300 pF without causing oscillations
(see the Typical Performance Characteristics for step re-
sponse plots). This compensation can also be used with
other gain settings in order to improve stability, especially
when driving capacitive loads (for optimum performance, Rc
and Cc may need to be adjusted).
BW(−3 dB) ≈ GBWP • β
In this case, assuming a GBWP of about 10 KHz, the ex-
pected BW would be around 50 Hz (vs 100 Hz with the
conventional inverting amplifier).
USING “T” NETWORK
Compromises need to be made whenever high gain invert-
ing stages need to achieve a high input impedance as well.
This is especially important in low current applications which
tend to deal with high resistance values. Using a traditional
inverting amplifier, gain is inversely proportional to the resis-
tor value tied between the inverting terminal and input while
the input impedance is equal to this value. For example, in
order to build an inverting amplifier with an input impedance
of 10MΩ and a gain of 100, one needs to come up with a
feedback resistor of 1000MΩ -an expensive task.
Looking at the problem from a different view, with RF defined
by AV•Rin, one could select a value for R in the “T” Network
and then determine R1 based on this selection:
An alternate solution is to use a “T” Network in the feedback
path, as shown in Fig. 2.
11
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The LMC6442 is more tolerant to capacitive loads when the
equivalent output load resistance is lowered or when output
voltage is 1V or greater from the V− supply. The capacitive
load drive capability is also improved by adding an isolating
resistor in series with the load and the output of the device.
Figure 5 shows the value of this resistor for various capaci-
tive loads (AV = −1), while limiting the output to less than 10
% overshoot.
Applications Information (Continued)
Referring to the Typical Performance Characteristics plot of
Phase Margin (Worst Case) vs Supply Voltage, note that
Phase Margin increases as the equivalent output load resis-
tance is lowered. This plot shows the expected Phase Mar-
gin when the device output is very close to V−, which is the
least stable condition of operation. Comparing this Phase
Margin value to the one read off the Open Loop Gain/Phase
vs Frequency plot, one can predict the improvement in
Phase Margin if the output does not swing close to V−. This
dependence of Phase Margin on output voltage is minimized
as long as the output load, RL, is about 1MΩ or less.
10006422
FIGURE 3. “T” Network Values for Various Values of R
For convenience, Fig. 3 shows R1 vs RF for different values
of R.
Output Phase Reversal: The LMC6442 is immune against
this behavior even when the input voltages exceed the com-
mon mode voltage range.
DESIGN CONSIDERATIONS FOR CAPACITIVE LOADS
Output Time Delay: Due to the ultra low power consump-
tion of the device, there could be as long as 2.5 ms of time
delay from when power is applied to when the device output
reaches its final value.
As with many other opamps, the LMC6442 is more stable at
higher closed loop gains when driving a capacitive load.
Figure 4 shows minimum closed loop gain versus load ca-
pacitance, to achieve less than 10% overshoot in the output
small signal response. In addition, the LMC6442 is more
stable when it provides more output current to the load and
when its output voltage does not swing close to V−.
10006447
FIGURE 4. Minimum Operating Gain vs Capactive Load
10006443
FIGURE 5. Isolating Resistor Value vs Capactive Load
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12
Application Circuits
Micropower Single Supply Voltage to Frequency Converter
10006445
+
<
10µA, f/V = 4.3 (Hz/V)
C
V
= 5V: I
S
10006446
Gain Stage with Current Boosting
10006454
13
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Application Circuits (Continued)
Offset Nulling Schemes
10006444
Ordering Information
Temperature Range
NSC
Drawing
Supplied
AS
Package
Package Marking
Military −55˚C to
Industrial −40˚C to +85˚C
+125˚C
8-pin SO-8 LMC6442AIM, LMC6442IM
LMC6442AIMX, LMC6442IMX
-
M08A
M08A
Rails
LMC6442AIM
2.5K
LMC6442IM
A08A
-
Tape and
Reel
MSOP
LMC6442AIMM,
LMC6442AIMMX, LMC6442IMM,
LMC6442IMMX
-
-
MUA08A Rails
LMC6442AIMMX,
3K Tape
MUA08A
LMC6442IMMX
and Reel
Rails
8-pin DIP
8-pin CDIP
10-pin SO
LMC6442AIN,
LMC6442AIN, LMC6442IN
-
N08E
J08A
LMC6442IN
5962-9761301QPA
Rails
LMC6442AMJ-QML
5962-976130IQPA
LMC6442AMWG-Q
9761301QXA
-
-
5962-9761301QXA
WG10A
Trays
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14
Physical Dimensions inches (millimeters)
unless otherwise noted
8-Lead (0.150" Wide) Molded Small Outline Package, JEDEC
Order Number LMC6442AIM or LMC6442IM or LMC6442AIMX or LMC6442IMX
NS Package Number M08A
8-Lead (0.300" Wide) Molded Dual-In-Line Package
Order Number LMC6442AIN or LMC6442IN or LMC6442INX
NS Package Number N08E
15
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
8-Lead (0.118" Wide) Molded Mini Small Outline Package
Order Number LMC6442AIMM or LMC6442IMM or LMC6442AIMMX or LMC6442IMMX
NS Package Number MUA08A
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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