LTC8541, LTC8542, LTC8544
Data Sheet
FN1615-32.2c
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
General Description
The LTC8541 (single), LTC8542 (dual) and LTC8544 (quad) are low voltage micro power
CMOS voltage feedback operational amplifiers. With an excellent bandwidth of 1.3 MHz,
a slew rate of 1.1 V/μs, and a quiescent current of 70 μA per amplifier at 5V, the LTC854x
family can be designed into a wide range of applications.
The LTC854x op-amps are specifically designed for general-purpose applications with
optimal performance. They have a wide input common-mode voltage range and excellent
output voltage swings, and the maximum input offset voltage are ±2.5 mV. These parts
provide rail-to-rail output swing into heavy loads. The LTC854x family is specified for
single or dual power supplies of +2.0 V to +5.5 V. All models are specified over the
extended industrial temperature range of −40 ℃ to +125 ℃.
The LTC8541 is available in 5-lead SC70 and SOT-23, and 8-lead SOIC packages. The
LTC8542 is available in 8-lead DFN, MSOP and SOIC packages. The LTC8544 is
available in 14-lead TSSOP and SOIC packages.
Features and Benefits
High Gains of >102 dB for Active Filters and Gain Stages
Low Offset Voltage: ±2.5 mV Maximum with 2 μV/℃ Low Drift
Gain-Bandwidth Product: 1.3 MHz
High Slew Rate: 1.1 V/μs
Low Power: 70 μA per Amplifier Supply Current
Settling Time to 0.1% with 2V Step: 1.5 μs
Unity Gain Stable
Rail-to-Rail Input and Output
– Input Voltage Range: -0.1 to +5.1 V at 5V Supply
Operating Power Supply: +2.0 to +5.5 V
Operating Temperature Range: −40℃ to +125℃
ESD Rating: HBM – 4kV, CDM – 2kV
Applications
Smoke/Gas/Environment Sensors
Audio Outputs
Active Filters
ASIC Input or Output Amplifier
Sensor Interfaces
Portable Equipment
Battery-Powered Instrumentation
Pin Configurations (Top View)
LTC8541
LTC8541
LTC8542
LTC8544
SC70-5/SOT23-5
SO-8
MSOP-8/SO-8
TSSOP-14/SO-14
OUT
1
–VS
2
+IN
3
5
+VS
NC
1
8
NC
–IN
2
7
4
–IN
+IN
3
6
–VS
4
5
NC
OUTA
1
+VS
–INA
2
OUT
+INA
3
–VS
4
A
14
OUTD
13
–IND
12
+IND
4
11
–VS
+INB
5
10
+INC
–INB
6
9
–INC
OUTB
7
8
OUTC
OUTA
1
OUTB
–INA
2
–INB
+INA
3
+INB
+VS
8
+VS
7
6
5
A
B
LTC8542
DFN1.5x1.5-8L/DFN2x2-8L
OUTA 1
8
+VS
–INA 2
7
OUTB
+INA 3
6
–INB
–VS 4
5
+INB
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
D
B
C
1
LTC8541, LTC8542, LTC8544
Data Sheet
FN1615-32.2c
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
Pin Description
Symbol
Description
–IN
Inverting input of the amplifier. The voltage range can go from (VS– – 0.1V) to (VS+ +
0.1V).
+IN
Non-inverting input of the amplifier. This pin has the same voltage range as –IN.
+VS
Positive power supply. The voltage is from 2.0V to 5.5V. Split supplies are possible as
long as the voltage between VS+ and VS– is between 2.0V and 5.5V. A bypass
capacitor of 0.1μF as close to the part as possible should be used between power
supply pins or between supply pins and ground.
–VS
Negative power supply. It is normally tied to ground. It can also be tied to a voltage
other than ground as long as the voltage between VS+ and VS– is from 2.0V to 5.5V. If it
is not connected to ground, bypass it with a capacitor of 0.1μF as close to the part as
possible.
OUT
Amplifier output.
N/C
No internal connection.
Ordering Information
Type Number
Package Name
Package Quantity
Marking Code
LTC8541XC5/R6
SC70-5
Tape and Reel, 3 000
AG1
LTC8541XT5/R6
SOT23-5
Tape and Reel, 3 000
AG1
LTC8541XS8/R8
SO-8
Tape and Reel, 4 000
AG1X
LTC8542XF8S/R10
DFN1.5x1.5-8L
Tape and Reel, 5 000
C42
LTC8542XF8/R6
DFN2x2-8L
Tape and Reel, 3 000
C42
LTC8542XV8/R6
MSOP-8
Tape and Reel, 3 000
AG2X
LTC8542XS8/R8
SO-8
Tape and Reel, 4 000
C42I X
LTC8544XT14/R6
TSSOP-14
Tape and Reel, 3 000
AG4 X
LTC8544XS14/R5
SO-14
Tape and Reel, 2 500
C44I X
Limiting Value
In accordance with the Absolute Maximum Rating System (IEC 60134).
Parameter
Absolute Maximum Rating
Supply Voltage, VS+ to VS–
10.0V
Common-Mode Input Voltage
VS– – 0.3V to VS+ + 0.3V
Storage Temperature Range
–65℃ to +150℃
Junction Temperature
160℃
Lead Temperature Range (Soldering 10 sec)
260℃
HBM ±4 000V
Electrostatic Discharge Voltage
CDM ±2 000V
MM ±400V
2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
LTC8541, LTC8542, LTC8544
Data Sheet
FN1615-32.2c
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
Electrical Characteristics
VS = 5.0V, TA = +25℃, VCM = VS /2, VO = VS /2, and RL = 10kΩ connected to VS /2, unless otherwise noted.
Boldface limits apply over the specified temperature range, TA = −40 to +125 ℃.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
–2.5
±0.5
+2.5
mV
INPUT CHARACTERISTICS
VOS
Input offset voltage
VOS TC
Offset voltage drift
over Temperature
IB
Input bias current
TA = +85 ℃
150
TA = +125 ℃
500
μV/℃
2
1
IOS
Input offset current
VCM
Common-mode voltage
range
CMRR
AVOL
Common-mode rejection
ratio
Open-loop voltage gain
RIN
Input resistance
CIN
Input capacitance
pA
1
VS––0.1
VCM = 0.05V to 3.5V
80
over Temperature
70
VCM = VS––0.1 to VS++0.1 V
70
over Temperature
66
RL = 10kΩ, VO = 0.05 to 3.5 V
102
over Temperature
90
RL = 2kΩ, VO = 0.15 to 3.5 V
93
over Temperature
82
pA
VS++0.1
V
97
dB
82
116
dB
108
GΩ
100
Differential
2.0
Common mode
3.5
pF
OUTPUT CHARACTERISTICS
VOH
High output voltage swing
VOL
Low output voltage swing
ZOUT
ISC
RL = 50 kΩ
VS+–3
RL = 2 kΩ
VS+–65
RL = 50 kΩ
VS–+2
RL = 2 kΩ
VS–+45
Closed-loop output
impedance
f = 200kHz, G = +1
0.4
Open-loop output
impedance
f = 1MHz, IO = 0
2.6
Source current through 10Ω
45
Sink current through 10Ω
50
Short-circuit current
mV
mV
Ω
mA
DYNAMIC PERFORMANCE
GBW
Gain bandwidth product
f = 1kHz
1.3
MHz
ΦM
Phase margin
CL = 100pF
66
°
SR
Slew rate
G = +1, CL = 100pF, VO = 1.5V to 3.5V
1.1
V/μs
tS
Settling time
To 0.1%, G = +1, 2V step
1.5
To 0.01%, G = +1, 2V step
1.8
THD+N
Total harmonic distortion +
f = 1kHz, G = +1, VO = 3VPP
noise
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
μs
0.002
%
3
LTC8541, LTC8542, LTC8544
Data Sheet
FN1615-32.2c
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
Electrical Characteristics (continued)
VS = 5.0V, TA = +25℃, VCM = VS /2, VO = VS /2, and RL = 10kΩ connected to VS /2, unless otherwise noted.
Boldface limits apply over the specified temperature range, TA = −40 to +125 ℃.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
NOISE PERFORMANCE
Vn
Input voltage noise
f = 0.1 to 10 Hz
6
μVP-P
en
Input voltage noise
density
f = 1kHz
27
nV/√Hz
In
Input current noise density f = 1kHz
4
fA/√Hz
POWER SUPPLY
VS
Operating supply voltage
PSRR
Power supply rejection
ratio
IQ
Quiescent current (per
amplifier)
2.0
VS = 2.0V to 5.5V, VCM < VS+ − 2V
82
over Temperature
75
5.5
102
70
over Temperature
V
dB
120
150
μA
THERMAL CHARACTERISTICS
TA
θJA
Operating temperature
range
Package Thermal
Resistance
4
–40
+125
SC70-5
333
SOT23-5
190
DFN2x2-8L
80
MSOP-8
216
SO-8
125
TSSOP-14
112
SO-14
115
℃
℃/W
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
LTC8541, LTC8542, LTC8544
Data Sheet
FN1615-32.2c
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
Typical Performance Characteristics
At TA = +25℃, VCM = VS /2, and RL = 10kΩ connected to VS /2, unless otherwise noted.
CL=100pF
1V/div
25mV/div
CL=100pF
2μs/div
5μs/div
Small Signal Step Response.
180
120
100
150
100
80
120
60
90
40
60
20
30
0
0
-20
-30
-40
1
10
100
1k
PSRR and CMRR (dB)
120
Phase (deg)
AVOL (dB)
Large Signal Step Response.
CMRR
80
60
PSRR
40
20
0
-20
-60
10k 100k 1M 10M
1
10
100
140
90
120
80
70
60
50
40
30
20
10
0
1k
10k
Frequency (Hz)
10k
100k
1M
10M
Power Supply and Common-mode Rejection Ratio
as a function of Frequency.
Channel Separation(dB)
Voltage Noise (nV/rtHz)
Open-loop Gain and Phase as a function of
Frequency.
100
1k
Frequency (Hz)
Frequency (Hz)
10
100
100k
Input Voltage Noise Spectral Density as a function of
Frequency.
100
80
60
40
20
0
10
100
1k
10k
100k
1M
10M
Frequency (Hz)
Channel Separation as a function of Frequency.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
5
LTC8541, LTC8542, LTC8544
Data Sheet
FN1615-32.2c
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
Typical Performance Characteristics (continued)
At TA = +25℃, VCM = VS /2, and RL = 10kΩ connected to VS /2, unless otherwise noted.
120
Quiescent Current (μA)
Quiescent Current (μA)
125
100
75
50
25
100
80
60
40
0
2
2.5
3
3.5
4
4.5
5
-50
5.5
-25
Supply Voltage (V)
100
125
Sourcing Current
800
4
700
600
500
400
300
200
3
–40℃
+125℃
+25℃
2
1
Sinking Current
100
0
0
0
10
Offset Voltage (mV)
20
30
40
50
60
70
Output Current (mA)
Output Voltage Swing as a function of Output
Current.
Input Offset Voltage Production Distribution.
70
Short-circuit Current (mA)
60
Short-circuit Current (mA)
75
5
Output Voltage
Distribution (Units)
50
Quiescent Current as a function of Temperature.
VCM = –VS
900
25
Temperature (℃)
Quiescent Current as a function of Supply Voltage.
1000
0
50
–ISC
40
30
+ISC
20
10
0
65
–ISC
60
55
50
45
+ISC
40
35
30
25
20
2
2.5
3
3.5
4
4.5
5
Supply Voltage (V)
Short-circuit Current as a function of Supply Voltage.
6
-50
-25
0
25
50
75
100
125
Temperature (℃)
Short-circuit Current as a function of Temperature.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
LTC8541, LTC8542, LTC8544
Data Sheet
FN1615-32.2c
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
Application Notes
LOW INPUT BIAS CURRENT
The LTC854x family is a CMOS op-amp family and features
very low input bias current in pA range. The low input bias
current allows the amplifiers to be used in applications with
high resistance sources. Care must be taken to minimize
PCB Surface Leakage. See below section on “PCB Surface
Leakage” for more details.
resistive loads (e.g. 50kΩ), the output voltage can typically
swing to within 3mV from the supply rails regardless of the
power-supply voltage applied. Different load conditions
change the ability of the amplifier to swing close to the rails.
For resistive loads up to 2-kΩ, the output swings typically to
within 65-mV of the positive supply rail and within 45-mV of
the negative supply rail.
PCB SURFACE LEAKAGE
6.0
In applications where low input bias current is critical,
Printed Circuit Board (PCB) surface leakage effects need to
be considered. Surface leakage is caused by humidity, dust
or other contamination on the board. Under low humidity
conditions, a typical resistance between nearby traces is
1012Ω. A 5V difference would cause 5pA of current to flow,
which is greater than the LTC854x’s input bias current at
+25℃ (±1fA, typical). It is recommended to use multi-layer
PCB layout and route the op-amp’s –IN and +IN signal
under the PCB surface.
The effective way to reduce surface leakage is to use a
guard ring around sensitive pins (or traces). The guard ring
is biased at the same voltage as the sensitive pin. An
example of this type of layout is shown in Figure 1 for
Inverting Gain application.
1. For Non-Inverting Gain and Unity-Gain Buffer:
a) Connect the non-inverting pin (+IN) to the input with
a wire that does not touch the PCB surface.
b) Connect the guard ring to the inverting input pin
(–IN). This biases the guard ring to the Common
Mode input voltage.
2. For Inverting Gain and Trans-impedance Gain Amplifiers
(convert current to voltage, such as photo detectors):
a) Connect the guard ring to the non-inverting input
pin (+IN). This biases the guard ring to the same
reference voltage as the op-amp (e.g., VS/2 or
ground).
b) Connect the inverting pin (–IN) to the input with a
wire that does not touch the PCB surface.
5.0
Guard
Ring
+IN
–IN
+VS
Figure 1. Use a guard ring around sensitive pins
AMPLITUDE (V)
4.0
3.0
2.0
1.0
0.0
-1.0
0
10
20
30
40
50
60
TIME (ms)
Figure 2. No Phase Inversion with Inputs Greater Than the
Power-Supply Voltage
The maximum output current is a function of total supply
voltage. As the supply voltage to the amplifier increases, the
output current capability also increases. Attention must be
paid to keep the junction temperature of the IC below 150℃
when the output is in continuous short-circuit. The output of
the amplifier has reverse-biased ESD diodes connected to
each supply. The output should not be forced more than
0.3V beyond either supply, otherwise current will flow
through these diodes.
CAPACITIVE LOAD AND STABILITY
The LTC854x can directly drive 500pF in unity-gain without
oscillation. The unity-gain follower (buffer) is the most
sensitive configuration to capacitive loading. Direct
capacitive loading reduces the phase margin of amplifiers
and this results in ringing or even oscillation. Applications
that require greater capacitive drive capability should use an
isolation resistor between the output and the capacitive load
like the circuit in Figure 3. The isolation resistor RISO and the
load capacitor CL form a zero to increase stability. The
bigger the RISO resistor value, the more stable VOUT will be.
Note that this method results in a loss of gain accuracy
because RISO forms a voltage divider with the RL.
GROUND SENSING AND RAIL TO RAIL
The input common-mode voltage range of the LTC854x
series extends 100mV beyond the supply rails. This is
achieved with a complementary input stage—an N-channel
input differential pair in parallel with a P-channel differential
pair. For normal operation, inputs should be limited to this
range. The absolute maximum input voltage is 300mV
beyond the supplies. Inputs greater than the input commonmode range but less than the maximum input voltage, while
not valid, will not cause any damage to the op-amp. Unlike
some other op-amps, if input current is limited, the inputs
may go beyond the supplies without phase inversion, as
shown in Figure 2. Since the input common-mode range
extends from (VS− − 0.1V) to (VS+ + 0.1V), the LTC854x opamps can easily perform ‘true ground’ sensing.
A topology of class AB output stage with common-source
transistors is used to achieve rail-to-rail output. For light
RISO
VOUT
LTC854x
VIN
CL
Figure 3. Indirectly Driving Heavy Capacitive Load
An improvement circuit is shown in Figure 4. It provides DC
accuracy as well as AC stability. The RF provides the DC
accuracy by connecting the inverting signal with the output.
The CF and RISO serve to counteract the loss of phase
margin by feeding the high frequency component of the
output signal back to the amplifier’s inverting input, thereby
preserving phase margin in the overall feedback loop.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
7
LTC8541, LTC8542, LTC8544
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
Data Sheet
FN1615-32.2c
Application Notes (continued)
CF
RF
RISO
VOUT
LTC854x
VIN
CL
RL
Figure 4. Indirectly Driving Heavy Capacitive Load with DC
Accuracy
For no-buffer configuration, there are two others ways to
increase the phase margin: (a) by increasing the amplifier’s
gain, or (b) by placing a capacitor in parallel with the
feedback resistor to counteract the parasitic capacitance
associated with inverting node.
POWER SUPPLY LAYOUT AND BYPASS
The LTC854x family operates from either a single +2.0V to
+5.5V supply or dual ±1.0V to ±2.75V supplies. For
single-supply operation, bypass the power supply VS with a
ceramic capacitor (i.e. 0.01μF to 0.1μF) which should be
placed close (within 2mm for good high frequency
performance) to the VS pin. For dual-supply operation, both
the VS+ and the VS– supplies should be bypassed to ground
8
with separate 0.1μF ceramic capacitors. A bulk capacitor
(i.e. 2.2μF or larger tantalum capacitor) within 100mm to
provide large, slow currents and better performance. This
bulk capacitor can be shared with other analog parts.
Good PC board layout techniques optimize performance by
decreasing the amount of stray capacitance at the op-amp’s
inputs and output. To decrease stray capacitance, minimize
trace lengths and widths by placing external components as
close to the device as possible. Use surface-mount
components whenever possible. For the op-amp, soldering
the part to the board directly is strongly recommended. Try
to keep the high frequency big current loop area small to
minimize the EMI (electromagnetic interfacing).
GROUNDING
A ground plane layer is important for the LTC854x circuit
design. The length of the current path speed currents in an
inductive ground return will create an unwanted voltage
noise. Broad ground plane areas will reduce the parasitic
inductance.
INPUT-TO-OUTPUT COUPLING
To minimize capacitive coupling, the input and output signal
traces should not be parallel. This helps reduce unwanted
positive feedback.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
LTC8541, LTC8542, LTC8544
Data Sheet
FN1615-32.2c
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
Typical Application Circuits
The LTC854x family has input bias current in the pA range.
This is ideal in buffering high impedance chemical sensors,
such as pH probes. As an example, the circuit in Figure 7
eliminates expansive low-leakage cables that that is
required to connect a pH probe (general purpose
combination pH probes, e.g Corning 476540) to metering
ICs such as ADC, AFE and/or MCU. A LTC854x op-amp
and a lithium battery are housed in the probe assembly. A
conventional low-cost coaxial cable can be used to carry the
op-amp’s output signal to subsequent ICs for pH reading.
DIFFERENTIAL AMPLIFIER
R2
R1
Vn
LTC854x
VOUT
Vp
R3
R4
SHUNT-BASED CURRENT SENSING AMPLIFIER
VREF
Figure 5. Differential Amplifier
The circuit shown in Figure 5 performs the difference
function. If the resistors ratios are equal R4/R3 = R2/R1, then:
VOUT = (Vp – Vn) × R2/R1 + VREF
INSTRUMENTATION AMPLIFIER
RG
VREF
R1
R2
R2
LTC854x
R1
LTC854x
VOUT
V1
V2
VOUT =(V1 V2 )(1
R1 2 R1
) VREF
R2 RG
Figure 6. Instrumentation Amplifier
The LTC854x family is well suited for conditioning sensor
signals in battery-powered applications. Figure 6 shows a
two op-amp instrumentation amplifier, using the LTC854x
op-amps. The circuit works well for applications requiring
rejection of common-mode noise at higher gains. The
reference voltage (VREF) is supplied by a low-impedance
source. In single voltage supply applications, the VREF is
typically VS/2.
The current sensing amplification shown in Figure 8 has a
slew rate of 2πfVPP for the output of sine wave signal, and
has a slew rate of 2fVPP for the output of triangular wave
signal. In most of motor control systems, the PWM
frequency is at 10kHz to 20kHz, and one cycle time is
100μs for a 10kHz of PWM frequency. In current shunt
monitoring for a motor phase, the phase current is
converted to a phase voltage signal for ADC sampling. This
sampling voltage signal must be settled before entering the
ADC. As the Figure 8 shown, the total settling time of a
current shunt monitor circuit includes: the rising edge delay
time (tSR) due to the op-amp’s slew rate, and the
measurement settling time (tSET). For a 3-shunt solution in
motor phase current sensing, if the smaller duty cycle of the
PWM is defined at 45% (In fact, the phase with minimum
PWM duty cycle, such as 5%, is not detected current
directly, and it can be calculated from the other two phase
currents), and the tSR is required at 20% of a total time
window for a phase current monitoring, in case of a 3.3V
motor control system (3.3V MCU with 12-bit ADC), the opamp’s slew rate should be more than:
3.3V / (100μs× 45% × 20%) = 0.37 V/μs
At the same time, the op-amp’s bandwidth should be much
greater than the PWM frequency, like 10 time at least.
tSR
VBUS
tSET
High side
switch
BUFFERED CHEMICAL SENSORS
tSR – Time delay due to op-amp slew rate
tSET – Measurement settling time
tSMP – Sampling time window
To Motor Phase
Coax
LTC854x
R1
10MΩ
3V
To ADC,
AFE or MCU
tSMP
VM
Low side
switch
R2
R1
pH
PROBE
RSHUNT
C1
LTC854x
R3
R4
R2
10MΩ
R5
C2
Filter
All components contained within the pH probe
Figure 7. Buffered pH Probe
Offset
Amplification
Figure 8. Current Shunt Monitor Circuit
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
9
To MCU
ADC pin
LTC8541, LTC8542, LTC8544
Data Sheet
FN1615-32.2c
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
Tape and Reel Information
REEL DIMENSIONS
TAPE DIMENSIONS
K0
P1
B0 W
Reel
Diameter
A0
Cavity
A0
B0
K0
W
P1
Reel
Width (W1)
Dimension designed to accommodate the component width
Dimension designed to accommodate the component length
Dimension designed to accommodate the component thickness
Overall width of the carrier tape
Pitch between successive cavity centers
QUADRANT ASSIGNMENTS FOR PIN 1 ORIETATION IN TAPE
Sprocket Holes
Q1
Q2
Q1
Q2
Q3
Q4
Q3
Q4
User Direction of Feed
Pocket Quadrants
* All dimensions are nominal
Device
Package
Type
Pins
SPQ
LTC8541XT5/R6
SOT23
5
3 000
10
Reel
Reel
Diameter Width W1
(mm)
(mm)
178
9.0
A0
(mm)
B0
(mm)
K0
(mm)
P1
(mm)
W
(mm)
Pin 1
Quadrant
3.3
3.2
1.5
4.0
8.0
Q3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
LTC8541, LTC8542, LTC8544
Data Sheet
FN1615-32.2c
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
Package Outlines
DIMENSIONS, SOT23-5
A2
A
A1
D
e1
Symbol
A
A1
A2
b
c
D
E1
E
e
e1
L
L1
θ
θ
L
E
E1
L1
e
b
Dimensions
In Millimeters
Min
Max
1.25
0.04
0.10
1.00
1.20
0.33
0.41
0.15
0.19
2.820
3.02
1.50
1.70
2.60
3.00
0.95 BSC
1.90 BSC
0.60 REF
0.30
0.60
0°
8°
Dimensions
In Inches
Min
Max
0.049
0.002
0.004
0.039
0.047
0.013
0.016
0.006
0.007
0.111
0.119
0.059
0.067
0.102
0.118
0.037 BSC
0.075 BSC
0.024 REF
0.012
0.024
0°
8°
c
RECOMMENDED SOLDERING FOOTPRINT, SOT23-5
1.0
0.039
0.95
0.037
0.95
0.037
0.7
0.028
2.4
0.094
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
mm
( inches
)
11
LTC8541, LTC8542, LTC8544
Data Sheet
FN1615-32.2c
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
Package Outlines (continued)
DIMENSIONS, SC70-5 (SOT353)
A2
A
Symbol
A1
D
e1
A
A1
A2
b
C
D
E
E1
e
e1
L
L1
θ
θ
e
L
E1
E
L1
b
Dimensions
In Millimeters
Min
Max
0.90
1.10
0.00
0.10
0.90
1.00
0.15
0.35
0.08
0.15
2.00
2.20
1.15
1.35
2.15
2.45
0.65 typ.
1.20
1.40
0.525 ref.
0.26
0.46
0°
8°
Dimensions
In Inches
Min
Max
0.035
0.043
0.000
0.004
0.035
0.039
0.006
0.014
0.003
0.006
0.079
0.087
0.045
0.053
0.085
0.096
0.026 typ.
0.047
0.055
0.021 ref.
0.010
0.018
0°
8°
C
RECOMMENDED SOLDERING FOOTPRINT, SC70-5 (SOT353)
0.50
0.0197
0.65
0.0256
0.65
0.0256
0.40
0.0157
1.9
0.0748
12
mm
( inches
)
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
LTC8541, LTC8542, LTC8544
Data Sheet
FN1615-32.2c
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
Package Outlines (continued)
DIMENSIONS, DFN1.5x1.5-8L
SIDE VIEW
A
A1
TOP VIEW
b
Symbol
A
A1
b
D
D2
E
E2
e
L
D2
E
L
E2
PIN#1
Min.
0.48
0.15
1.45
1.15
1.45
0.65
0.125
Millimeters
Nom.
0.53
0.127 REF.
0.20
1.50
1.20
1.50
0.70
0.40 BSC.
0.175
D
e
PIN#1
BOTTOM VIEW
RECOMMENDED SOLDERING FOOTPRINT, DFN1.5x1.5-8L
1.30
0.0512
PACKAGE
OUTLINE
8X
0.80
0.0315
0.40
0.0157
1.80
0.0709
1
0.40
PITCH
0.0157
0.25
8X 0.0098
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
mm
( inches
)
13
Max.
0.58
0.25
1.55
1.25
1.55
0.75
0.225
LTC8541, LTC8542, LTC8544
Data Sheet
FN1615-32.2c
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
Package Outlines (continued)
DIMENSIONS, DFN2x2-8L
E
A
A1
Symbol
Pin 1 Index
Area
D
D2
Exposed Thermal
Pad Zone
L
E2
R=0.1
Min.
0.48
A
A1
b
D
D2
E
E2
e
L
0.18
1.90
1.45
1.90
0.95
0.23
Millimeters
Nom.
0.53
0.127 BSC.
0.22
2.00
1.50
2.00
1.00
0.50 BSC.
0.28
Max.
0.58
0.30
2.10
1.55
2.10
1.05
0.33
Pin 1 Identification
Chamfer 0.35*45°
e
b
BOTTOM VIEW
RECOMMENDED SOLDERING FOOTPRINT, DFN2x2-8L
1.60
0.0630
PACKAGE
OUTLINE
8X
0.50
0.0197
1.00
0.0394
2.30
0.0906
1
0.50
PITCH
0.0197
14
0.30
8X 0.0118
mm
( inches
)
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
LTC8541, LTC8542, LTC8544
Data Sheet
FN1615-32.2c
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
Package Outlines (continued)
DIMENSIONS, MSOP-8L
A2
A
A1
D
b
Symbol
e
A
A1
A2
b
C
D
E
E1
e
L
θ
L
E1
E
Dimensions
In Millimeters
Min
Max
0.800
1.100
Dimensions
In Inches
Min
Max
0.031
0.043
0.050
0.150
0.750
0.950
0.290
0.380
0.150
0.200
2.900
3.100
2.900
3.100
4.700
5.100
0.650 TYP.
0.400
0.700
0°
8°
0.002
0.006
0.030
0.037
0.011
0.015
0.006
0.008
0.114
0.122
0.114
0.122
0.185
0.201
0.026 TYP.
0.016
0.028
0°
8°
θ
C
RECOMMENDED SOLDERING FOOTPRINT, MSOP-8L
8X
(0.45)
MAX
(0.018)
(1.45)
MAX
(0.057)
8X
4.40
(5.85)
MAX
0.173
(0.230)
(2.95)
MIN
(0.116)
0.65
PITCH
0.026
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
mm
( inches
)
15
LTC8541, LTC8542, LTC8544
Data Sheet
FN1615-32.2c
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
Package Outlines (continued)
DIMENSIONS, SO-8
A2
A
A1
D
b
Symbol
e
A
A1
A2
b
C
D
E
E1
e
L
θ
L
E
E1
θ
Dimensions
In Millimeters
Min
Max
1.370
1.670
0.070
0.170
1.300
1.500
0.306
0.506
0.203 TYP.
4.700
5.100
3.820
4.020
5.800
6.200
1.270 TYP.
0.450
0.750
0°
8°
Dimensions
In Inches
Min
Max
0.054
0.066
0.003
0.007
0.051
0.059
0.012
0.020
0.008 TYP.
0.185
0.201
0.150
0.158
0.228
0.244
0.050 TYP.
0.018
0.030
0°
8°
C
RECOMMENDED SOLDERING FOOTPRINT, SO-8
8X
5.40
0.213
(1.55)
MAX
(0.061)
(3.90)
MIN
(0.154)
1
(0.60)
MAX 8X
(0.024)
16
PITCH
1.270
0.050
mm
( inches
)
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
LTC8541, LTC8542, LTC8544
Data Sheet
FN1615-32.2c
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
Package Outlines (continued)
DIMENSIONS, TSSOP-14L
A3 A2
A
Symbol
A1
D
b
e
C
L1 L
E
E1
A
A1
A2
A3
b
C
D
E
E1
e
L1
L
θ
Dimensions
In Millimeters
Min
Max
1.200
0.050
0.150
0.900
1.050
0.390
0.490
0.200
0.290
0.130
0.180
4.860
5.060
6.200
6.600
4.300
4.500
0.650 TYP.
1.000 REF.
0.450
0.750
0°
8°
Dimensions
In Inches
Min
Max
0.047
0.002
0.006
0.035
0.041
0.015
0.019
0.008
0.011
0.005
0.007
0.191
0.199
0.244
0.260
0.169
0.177
0.026 TYP.
0.039 REF.
0.018
0.030
0°
8°
θ
RECOMMENDED SOLDERING FOOTPRINT, TSSOP-14L
14X
(1.45)
MAX
(0.057)
(4.40)
MIN
(0.173)
PITCH
0.65
0.026
1
5.90
0.232
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
14X
(0.45)
MAX
(0.018)
mm
( inches
)
17
LTC8541, LTC8542, LTC8544
Data Sheet
FN1615-32.2c
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
Package Outlines (continued)
DIMENSIONS, SO-14
A3
A2
A
A1
D
b
C
e
L1 L
E
Symbol
E1
A
A1
A2
A3
b
C
D
E
E1
e
L1
L
θ
Dimensions
In Millimeters
Min
Max
1.450
1.850
0.100
0.300
1.350
1.550
0.550
0.750
0.406 TYP.
0.203 TYP.
8.630
8.830
5.840
6.240
3.850
4.050
1.270 TYP.
1.040 REF.
0.350
0.750
2°
8°
Dimensions
In Inches
Min
Max
0.057
0.073
0.004
0.012
0.053
0.061
0.022
0.030
0.016 TYP.
0.008 TYP.
0.340
0.348
0.230
0.246
0.152
0.159
0.050 TYP.
0.041 REF.
0.014
0.030
2°
8°
θ
RECOMMENDED SOLDERING FOOTPRINT, SO-14
14X
5.40
0.213
(1.50)
MAX
(0.059)
(3.90)
MIN
(0.154)
1
(0.60)
MAX 14X
(0.024)
18
PITCH
1.270
0.050
mm
( inches
)
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
Data Sheet
FN1615-32.2c
LTC8541, LTC8542, LTC8544
1.3MHz, 70μA, CMOS RRIO Operational Amplifiers
IMPORTANT NOTICE
Linearin is a global fabless semiconductor company specializing in advanced high-performance highquality analog/mixed-signal IC products and sensor solutions. The company is devoted to the innovation of
high performance, analog-intensive sensor front-end products and modular sensor solutions, applied in
multi-market of medical & wearable devices, smart home, sensing of IoT, and intelligent industrial & smart
factory (industrie 4.0). Linearin’s product families include widely-used standard catalog products, solutionbased application specific standard products (ASSPs) and sensor modules that help customers achieve
faster time-to-market products. Go to http://www.linearin.com for a complete list of Linearin product
families.
For additional product information, or full datasheet, please contact with the Linearin’s Sales Department
or Representatives.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
19
