Micrel MIC7111 1.8v ittybittyâ ¢ rail-to-rail input/output op amp preliminary information Datasheet

MIC7111
Micrel
MIC7111
1.8V IttyBitty™ Rail-to-Rail Input/Output Op Amp
Preliminary Information
General Description
Features
The MIC7111 is a micropower operational amplifier featuring
rail-to-rail input and output performance in Micrel’s IttyBitty™
SOT-23-5 package. The MIC7111 is ideal for systems where
small size is a critical consideration.
•
•
•
•
•
Small footprint SOT-23-5 package
Guaranteed performance at 1.8V, 2.7V, 5V, and 10V
15µA typical supply current at 1.8V
25kHz gain-bandwidth at 5V
Output swing to within 1mV of rails
with 1.8V supply and 100kΩ load
• Suitable for driving capacitive loads
The MIC7111 is designed to operate from 1.8V to 11V power
supplies.
The MIC7111 benefits small battery operated portable electronic devices where small size and the ability to place the
amplifier close to the signal source are primary design
concerns.
For other package options, please contact the factory.
Applications
•
•
•
•
•
•
Wireless and cellular communications
GaAs RF amplifier bias amplifier
Current sensing for battery chargers
Reference voltage buffer
Transducer linearization and interface
Portable computing
Ordering Information
Junction Temp. Range
Package
MIC7111BM5
–40°C to +85°C
SOT-23-5
Functional Configuration
Pin Configuration
IN+
Part Number
IN+
V+ OUT
3
2
1
Part
Identification
3
V+ OUT
2
1
A13
4
IN–
5
4
5
V–
IN–
V–
SOT-23-5 (M5)
Pin Description
Pin Number
Pin Name
Pin Function
1
OUT
Amplifier Output
2
V+
Positive Supply
3
IN+
Noninverting Input
4
IN–
Inverting Input
5
V–
Negative Suppy
IttyBitty is a trademark of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
June 1998
1
MIC7111
MIC7111
Micrel
Absolute Maximum Ratings (Note 1)
Operating Ratings (Note 1)
Supply Voltage (VV+ – VV–) ........................................... 12V
Differential Input Voltage (VIN+ – VIN–) ........... ±(VV+ – VV–)
I/O Pin Voltage (VIN, VOUT), Note 2
............................................. VV+ + 0.3V to VV– – 0.3V
Junction Temperature (TJ) ...................................... +150°C
Storage Temperature ............................... –65°C to +150°C
Lead Temperature (soldering, 10 sec.) ..................... 260°C
ESD, Note 5 .................................................................. 2kV
Supply Voltage (VV+ – VV–) .............................. 1.8V to 11V
Junction Temperature (TJ) ......................... –40°C to +85°C
Max. Junction Temperature (TJ(max)), Note 3 ........... +85°C
Package Thermal Resistance (θJA), Note 4.......... 325°C/W
Max. Power Dissipation ............................................ Note 3
DC Electrical Characteristics (1.8V)
VV+ = +1.8V, VV– = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted
Symbol
Parameter
VOS
Condition
Min
Typ
Max
Units
Input Offset Voltage
0.9
7
9
mV
mV
TCVOS
Input Offset Voltage
Temperature Drift
2.0
IB
Input Bias Current
IOS
µV/°C
1
10
500
pA
pA
Input Offset Current
0.01
0.5
75
pA
pA
RIN
Input Resistance
>10
TΩ
+PSRR
Positive Power Supply
Rejection Ratio
1.8V ≤ VV+ ≤ 5V, VV– = 0V,
VCM = VOUT = 0.9V
60
85
dB
–PSRR
Negative Power Supply
Rejection Ratio
–1.8V ≤ VV– ≤ –5V, VV+ = 0V,
VCM = VOUT = –0.9V
60
85
dB
CMRR
Common-Mode Rejection Ratio
VCM = –0.2V to +2.0V
50
70
dB
CIN
Common Mode Input Capacitance
3
pF
VOUT
Output Voltage Swing
ISC
AVOL
Is
Output Short Circuit Current
Note 6
Voltage Gain
Supply Current
output high, RL = 100k,
specified as VV+ – VOUT
0.14
1
1
mV
mV
output low, RL = 100k
0.14
1
1
mV
mV
output high, RL = 2k,
specified as VV+ – VOUT
6.8
23
34
mV
mV
output low, RL = 2k
6.8
23
34
mV
mV
sourcing, VOUT = 0V
15
25
mA
sinking, VOUT = 1.8V
15
25
mA
sourcing
400
V/mV
sinking
400
V/mV
VV+ = 1.8V, VOUT = VV+/2
15
35
µA
AC Electrical Characteristics (1.8V)
V+ = +1.8V, V– = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted
SR
Slew Rate
GBW
Gain Bandwidth Product
MIC7111
voltage follower, 1V step, RL = [email protected]
VOUT = 1VP–P
2
0.015
V/µs
25
kHz
June 1998
MIC7111
Micrel
DC Electrical Characteristics (2.7V)
VV+ = +2.7V, VV– = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted
Symbol
Parameter
VOS
Condition
Min
Typ
Max
Units
Input Offset Voltage
0.9
7
9
mV
mV
TCVOS
Input Offset Voltage
Temperature Drift
2.0
IB
Input Bias Current
IOS
µV/°C
1
10
500
pA
pA
Input Offset Current
0.01
0.5
75
pA
pA
RIN
Input Resistance
>10
TΩ
+PSRR
Positive Power Supply
Rejection Ratio
2.7V ≤ VV+ ≤ 5V, VV– = 0V,
VCM = VOUT = 1.35V
60
90
dB
–PSRR
Negative Power Supply
Rejection Ratio
–2.7V ≤ VV– ≤ –5V, VV+ = 0V,
VCM = VOUT = –1.35V
60
90
dB
CMRR
Common-Mode Rejection Ratio
VCM = –0.2V to +2.9V
52
75
dB
CIN
Common Mode Input Capacitance
3
pF
VOUT
Output Voltage Swing
ISC
AVOL
Is
Output Short Circuit Current
Note 6
Voltage Gain
Supply Current
output high, RL = 100k,
specified as VV+ – VOUT
0.2
1
1
mV
mV
output low, RL = 100k
0.2
1
1
mV
mV
output high, RL = 2k,
specified as VV+ – VOUT
10
33
50
mV
mV
output low, RL = 2k
10
33
50
mV
mV
sourcing, VOUT = 0V
30
50
mA
sinking, VOUT = 2.7V
30
50
mA
sourcing
400
V/mV
sinking
400
V/mV
VV+ = 2.7V, VOUT = VV+/2
17
42
µA
Max
Units
AC Electrical Characteristics (2.7V)
V+ = +2.7V, V– = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted
Symbol
Parameter
Condition
SR
Slew Rate
voltage follower, 1V step, RL = [email protected]
VOUT = 1VP–P
GBW
Gain Bandwidth Product
June 1998
Min
3
Typ
0.015
V/µs
25
kHz
MIC7111
MIC7111
Micrel
DC Electrical Characteristics (5V)
VV+ = +5.0V, VV– = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted
Symbol
Parameter
VOS
Condition
Min
Typ
Max
Units
Input Offset Voltage
0.9
7
9
mV
mV
TCVOS
Input Offset Voltage
Temperature Drift
2.0
IB
Input Bias Current
IOS
µV/°C
1
10
500
pA
pA
Input Offset Current
0.01
0.5
75
pA
pA
RIN
Input Resistance
>10
TΩ
+PSRR
Positive Power Supply
Rejection Ratio
5V ≤ VV+ ≤ 10V, VV– = 0V,
VCM = VOUT = 2.5V
65
95
dB
–PSRR
Negative Power Supply
Rejection Ratio
–5V ≤ VV– ≤ –10V, VV+ = 0V,
VCM = VOUT = –2.5V
65
95
dB
CMRR
Common-Mode Rejection Ratio
VCM = –0.2V to +5.2V
57
80
dB
CIN
Common Mode Input Capacitance
3
pF
VOUT
Output Voltage Swing
ISC
AVOL
IS
Output Short Circuit Current
Note 6
Voltage Gain
Supply Current
output high, RL = 100k,
specified as VV+ – VOUT
0.3
1.5
1.5
mV
mV
output low, RL = 100k
0.3
1.5
1.5
mV
mV
output high, RL = 2k,
specified as VV+ – VOUT
15
50
75
mV
mV
output low, RL = 2k
15
50
75
mV
mV
sourcing, VOUT = 0V
80
100
mA
sinking, VOUT = 5V
80
100
mA
sourcing
500
V/mV
sinking
500
V/mV
VV+ = 5V, VOUT = VV+/2
20
50
µA
Max
Units
AC Electrical Characteristics (5V)
V+ = +5V, V– = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted
Symbol
Parameter
Condition
Min
SR
Slew Rate
voltage follower, 1V step, RL = [email protected]
VOUT = 1VP–P
GBW
Gain Bandwidth Product
Typ
0.02
V/µs
25
kHz
DC Electrical Characteristics (10V)
VV+ = +10V, VV– = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted
Symbol
Parameter
VOS
TCVOS
MIC7111
Condition
Min
Typ
Max
Units
Input Offset Voltage
0.9
7
9
mV
mV
Input Offset Voltage
Temperature Drift
2.0
4
µV/°C
June 1998
MIC7111
Micrel
Symbol
Parameter
IB
Input Bias Current
IOS
Typ
Max
Units
1
10
500
pA
pA
Input Offset Current
0.01
0.5
75
pA
pA
RIN
Input Resistance
>10
TΩ
+PSRR
Positive Power Supply
Rejection Ratio
5V ≤ VV+ ≤ 10V, VV– = 0V,
VCM = VOUT = 2.5V
65
95
dB
–PSRR
Negative Power Supply
Rejection Ratio
–5V ≤ VV– ≤ –10V, VV+ = 0V,
VCM = VOUT = –2.5V
65
95
dB
CMRR
Common-Mode Rejection Ratio
VCM = –0.2V to +10.2V
60
85
dB
CIN
Common Mode Input Capacitance
3
pF
VOUT
Output Voltage Swing
ISC
Output Short Circuit Current
Note 6
AVOL
Voltage Gain
IS
Supply Current
Condition
Min
output high, RL = 100k,
specified as VV+ – VOUT
0.45
2.5
2.5
mV
mV
output low, RL = 100k
0.45
2.5
2.5
mV
mV
output high, RL = 2k,
specified as VV+ – VOUT
24
80
120
mV
mV
output low, RL = 2k
24
80
120
mV
mV
sourcing, VOUT = 0V
100
200
mA
sinking, VOUT = 10V
100
200
mA
sourcing
500
V/mV
sinking
500
V/mV
VV+ = 10V, VOUT = VV+/2
25
65
µA
Max
Units
AC Electrical Characteristics (10V)
V+ = +10V, V– = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted
Symbol
Parameter
Condition
Min
SR
Slew Rate
voltage follower, 1V step, RL = [email protected]
VOUT = 1VP–P
GBW
Typ
0.02
V/µs
Gain Bandwidth Product
25
kHz
φM
Phase Margin
50
°
GM
Gain Margin
15
dB
eN
Input Referred Voltage Noise
f = 1kHz, VCM = 1.0V
110
nV/ Hz
iN
Input Referred Current Noise
f = 1kHz
0.03
pA/ Hz
General Notes: Devices are ESD protected; however, handling precautions are recommended. All limits guaranteed by testing on statistical analysis.
Note 1:
Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when
operating the device outside its recommended operating ratings.
Note 2:
I/O Pin Voltage is any external voltage to which an input or output is referenced.
Note 3:
The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(max); the junction-to-ambient thermal
resistance, θJA; and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using:
PD = (TJ(max) – TA) ÷ θJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature.
Note 4:
Thermal resistance, θJA, applies to a part soldered on a printed-circuit board.
Note 5:
Human body model, 1.5k in series with 100pF.
Note 6:
Short circuit may cause the device to exceed maxium allowable power dissipation. See Note 3.
June 1998
5
MIC7111
MIC7111
Micrel
Driving Capacitive Loads
Driving a capacitive load introduces phase-lag into the output
signal, and this in turn reduces op-amp system phase margin.
The application that is least forgiving of reduced phase
margin is a unity gain amplifier. The MIC7111 can typically
drive a 500pF capacitive load connected directly to the output
when configured as a unity-gain amplifier.
Application Information
Input Common-Mode Voltage
The MIC7111 tolerates input overdrive by at least 300mV
beyond either rail without producing phase inversion.
If the absolute maximum input voltage is exceeded, the input
current should be limited to ±5mA maximum to prevent
reducing reliability. A 10kΩ series input resistor, used as a
current limiter, will protect the input structure from voltages as
large as 50V above the supply or below ground. See Figure
1.
RIN
Using Large-Value Feedback Resistors
A large-value feedback resistor (> 500kΩ) can reduce the
phase margin of a system. This occurs when the feedback
resistor acts in conjunction with input capacitance to create
phase lag in the fedback signal. Input capacitance is usually
a combination of input circuit components and other parasitic
capacitance, such as amplifier input capacitance and stray
printed circuit board capacitance.
Figure 2 illustrates a method of compensating phase lag
caused by using a large-value feedback resistor. Feedback
capacitor CFB introduces sufficient phase lead to overcome
the phase lag caused by feedback resistor RFB and input
capacitance CIN. The value of CFB is determined by first
estimating CIN and then applying the following formula:
VOUT
VIN
10kΩ
Figure 1. Input Current-Limit Protection
Output Voltage Swing
Sink and source output resistances of the MIC7111 are
equal. Maximum output voltage swing is determined by the
load and the approximate output resistance. The output
resistance is:
ROUT =
RIN × CIN ≤ RFB × CFB
CFB
VDROP
RFB
ILOAD
VDROP is the voltage dropped within the amplifier output
stage. VDROP and ILOAD can be determined from the VO
(output swing) portion of the appropriate Electrical Characteristics table. ILOAD is equal to the typical output high voltage
minus V+/2 and divided by RLOAD. For example, using the
Electrical Characteristics DC (5V) table, the typical output
voltage drop using a 2kΩ load (connected to V+/2) is 0.015V,
which produces an ILOAD of:
VIN
RIN
VOUT
CIN
Figure 2. Cancelling Feedback Phase Lag
2.5V − 0.015V
= 1.243mA
2kΩ
Since a significant percentage of CIN may be caused by board
layout, it is important to note that the correct value of CFB may
then:
ROUT =
MIC7111
15mV
= 12.1 ≈ 12Ω
1.243mA
6
June 1998
MIC7111
Micrel
VS
0.5V to Q1 VCEO(sus)
change when changing from a breadboard to the final circuit
layout.
Typical Circuits
Some single-supply, rail-to-rail applications for which the
MIC7111 is well suited are shown in the circuit diagrams of
Figures 3 through 7.
3
VIN
0V to 2V
V+
1.8V to 10V
2
VOUT
0V to V+
Load
V+
1.8V to 10V
MIC7111
IOUT
1
Q1
VCEO = 40V
2N3904
IC(max) = 200mA
4
{
5
3
VIN
1
V+
AV
0V to
MIC7111
2
VOUT
0V to V+
4
5
RS
10Ω
1⁄2W
Change Q1 and RS
for higher current
and/or different gain.
IOUT =
R2
910k
R1
100k
VIN
= 100mA/V as shown
RS
Figure 5. Voltage-Controlled Current Sink
R4
Figure 3a. Noninverting Amplifier
100k
V+
C1
0.001µF
100
V+
2
4
MIC7111
VOUT (V)
1
3
A V = 1+
5
R2
≈ 10
R1
V+
0
0
R2
R4
100k
100k
100
VIN (V)
VOUT
V+
0V
R3
100k
Figure 3b. Noninverting Amplifier Behavior
Figure 6. Square Wave Oscillator
V+
1.8V to 10V
VIN
0V to V+
3
2
CIN
MIC7111
1
4
R1
R2
33k
330k
V+
VOUT
0V to V+
5
2
4
MIC7111
COUT
1
VOUT = VIN
3
5
RL
VOUT
0V
Figure 4. Voltage Follower/Buffer
V+
R3
330k
R2
C1
1µF
330k
=
= −10
R4 A V = −
R1 33k
330k
Figure 7. AC-Coupled Inverting Amplifier
June 1998
7
MIC7111
MIC7111
Micrel
Package Information
1.90 (0.075) REF
0.95 (0.037) REF
1.75 (0.069)
1.50 (0.059)
3.00 (0.118)
2.60 (0.102)
DIMENSIONS:
MM (INCH)
1.30 (0.051)
0.90 (0.035)
3.02 (0.119)
2.80 (0.110)
0.20 (0.008)
0.09 (0.004)
10°
0°
0.15 (0.006)
0.00 (0.000)
0.50 (0.020)
0.35 (0.014)
0.60 (0.024)
0.10 (0.004)
SOT-23-5 (M5)
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
+ 1 (408) 944-0800
FAX
+ 1 (408) 944-0970
WEB
USA
http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
© 1998 Micrel Incorporated
MIC7111
8
June 1998
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