LTC6087/LTC6088
Dual/Quad 14MHz,
Rail-to-Rail CMOS Amplifiers
FEATURES
DESCRIPTION
Low Offset Voltage: 750µV Maximum
n Low Offset Drift: 5µV/°C Maximum
n Input Bias Current:
1pA (Typical at 25°C)
15pA (Typical at 85°C)
n Rail-to-Rail Inputs and Outputs
n Gain Bandwidth Product: 14MHz
n CMRR: 70dB Minimum
n PSRR: 93dB Minimum
n Input Noise Voltage Density: 12nV/√Hz
n Supply Current: 1.05mA per Amp
n Shutdown Current: 2.3µA per Amp
n 2.7V to 5.5V Operation Voltage
n Available in 8-Lead MSOP and 10-Lead DFN
Packages (LTC6087), 16-Lead SSOP and DFN
Packages (LTC6088)
The LTC®6087/LTC6088 are dual/quad, low noise, low
offset, rail-to-rail input/output, unity-gain stable CMOS
operational amplifiers that feature 1pA of input bias current.
A 14MHz gain bandwidth and 7.2V/µs slew rate, combined
with low noise (10nV/√Hz) and a low 0.75mV offset, make
the LTC6087/LTC6088 useful in a variety of applications.
The 1.05mA supply current and the shutdown mode are
ideal for signal processing applications which demand
performance with minimal power.
n
The LTC6087/LTC6088 has an output stage which swings
within 30mV of either supply rail to maximize signal dynamic range in low supply applications. The input common
mode range includes the entire supply voltage. These op
amps are specified on power supply voltages of 3V and
5V from –40°C to 125°C.
The dual amplifier LTC6087 is available in 8-lead MSOP
and 10-lead DFN packages. The quad amplifier LTC6088
is available in 16-lead SSOP and DFN packages.
APPLICATIONS
n
n
n
n
n
Portable Test Equipment
Medical Equipment
Audio
Data Acquisition
High Impedance Transducer Amplifier
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog
Devices, Inc. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
LTC6087 Input Bias Current
vs Temperature
Single Supply Shock/Vibration Sensor Amplifier
VS
100k
+
100k
0.1µF 1/2 LTC6087
+
1/2 LTC6087
–
–
1k
1%
100M
100pF
100k
1%
VOUT
570mV/g
16Hz TO 10kHz
VS = 2.7V TO 5.5V
INPUT BIAS CURRENT (pA)
VS
MURATA SHOCK
SENSOR
PKGS-00MX1
520pF, 0.57pC/g
www.murata.com
1000
VS = 5V
VCM = 2.5V
100
10
60878 TA01a
1
25
40
55
70
85 100
TEMPERATURE (°C)
115
130
60878 TA01b
60878fd
For more information www.linear.com/LTC6087
1
LTC6087/LTC6088
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage (V+ to V–)....................................6V
Input Voltage....................................................... V– to V+
Input Current......................................................... ±10mA
SHDNA/SHDNB Voltage...................................... V– to V+
Output Short-Circuit Duration (Note 2)............. Indefinite
Operating Temperature Range (Note 3)
LTC6087C/LTC6088C...........................–40°C to 85°C
LTC6087H/LTC6088H......................... –40°C to 125°C
Specified Temperature Range (Note 4)
LTC6087C/LTC6088C............................... 0°C to 70°C
LTC6087H/LTC6088H......................... –40°C to 125°C
Junction Temperature............................................ 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MS8, GN16 Only................................................ 300°C
PIN CONFIGURATION
TOP VIEW
B
V+
OUTB
–INB
+INB
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 200°C/W
OUTA
1
–INA
2
+INA
3
V–
4
SHDNA
5
1
2
+INA
3
–
+A
D
15 –IND
14 +IND
V+
4
+INB
5
–INB
6
OUTB
7
10 OUTC
NC
8
9
13
+
–B
+
C–
8 –INB
B
7 +INB
6 SHDNB
TOP VIEW
16 OUTD
+
–
–INA
9 OUTB
11
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 43°C/W
EXPOSED PAD (PIN 11) IS V–, MUST BE SOLDERED TO PCB
TOP VIEW
OUTA
10 V+
–
+A
V–
12 +INC
11 –INC
NC
GN PACKAGE
16-LEAD PLASTIC SSOP NARROW
TJMAX = 150°C, θJA = 110°C/W
OUTA
1
16 OUTD
–INA
2
+INA
3
V+
4
+INB
5
–INB
6
OUTB
7
10 OUTC
NC
8
9
–
+A
+
–
–
+A
8
7
6
5
+
–
1
2
3
4
+
–
TOP VIEW
OUTA
–INA
+INA
V–
D
14 +IND
13 V–
17
+
–B
15 –IND
+
C–
12 +INC
11 –INC
NC
DHC PACKAGE
16-LEAD (5mm × 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 43°C/W
EXPOSED PAD (PIN 17) IS V–, MUST BE SOLDERED TO PCB
60878fd
2
For more information www.linear.com/LTC6087
LTC6087/LTC6088
ORDER INFORMATION
(http://www.linear.com/product/LTC6087-X#orderinfo)
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC6087CDD#PBF
LTC6087CDD#TRPBF
LCTX
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LTC6087HDD#PBF
LTC6087HDD#TRPBF
LCTX
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC6087CMS8#PBF
LTC6087CMS8#TRPBF
LTCTY
8-Lead Plastic MSOP
–40°C to 85°C
LTC6087HMS8#PBF
LTC6087HMS8#TRPBF
LTCTY
8-Lead Plastic MSOP
–40°C to 125°C
LTC6088CDHC#PBF
LTC6088CDHC#TRPBF
6088
16-Lead (5mm × 3mm) Plastic DFN
–40°C to 85°C
LTC6088HDHC#PBF
LTC6088HDHC#TRPBF
6088
16-Lead (5mm × 3mm) Plastic DFN
–40°C to 125°C
LTC6088CGN#PBF
LTC6088CGN#TRPBF
6088
16-Lead Plastic SSOP
–40°C to 85°C
LTC6088HGN#PBF
LTC6088HGN#TRPBF
6088H
16-Lead Plastic SSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full specified
temperature range, otherwise specifications are at TA = 25°C. Test conditions are V+ = 3V, V– = 0V, VCM = 0.5V unless otherwise noted.
C SUFFIX
SYMBOL PARAMETER
VOS
Offset Voltage (Note 5)
∆VOS/∆T Input Offset Voltage Drift (Note 6)
CONDITIONS
MIN
LTC6087MS8, LTC6088GN
LTC6087DD, LTC6088DHC
LTC6087MS8, LTC6088GN
LTC6087DD, LTC6088DHC
l
l
LTC6087MS8, LTC6088GN
LTC6087DD, LTC6088DHC
l
l
MAX
±330
±330
±2
±2
TYP
MAX
UNITS
±750
±1100
±900
±1350
±330
±330
±750
±1100
±1100
±1600
µV
µV
µV
µV
±5
±5
±2
±2
±5
±5
µV/°C
µV/°C
500
pA
pA
150
pA
pA
Input Bias Current (Notes 5, 7)
IOS
Input Offset Current (Notes 5, 7)
en
Input Noise Voltage Density
f = 1kHz
f = 10kHz
12
10
12
10
nV/√Hz
nV/√Hz
Input Noise Voltage
0.1Hz to 10Hz
2.5
2.5
µVP-P
Input Noise Current Density (Note 8)
f = 1Hz
l
Guaranteed by 5V Test
Input Capacitance
Differential Mode
Common Mode
f = 100kHz
CMRR
Common Mode Rejection Ratio
0V ≤ VCM ≤ 3V
Power Supply Rejection Ratio
VS = 2.7V to 5.5V
1
40
0.5
30
0.56
l
CIN
VOUT
0.5
l
Input Common Mode Range
PSRR
1
MIN
IB
in
Guaranteed by 5V Test
H SUFFIX
TYP
V–
0.56
V+
V–
2.7
4.2
fA/√Hz
V+
V
2.7
4.2
pF
pF
64
63
80
64
61
80
l
dB
dB
93
90
115
93
85
115
l
dB
dB
Output Voltage, High (Referred to V+)
No Load
ISOURCE = 1mA
ISOURCE = 5mA
l
l
l
5
25
120
15
50
210
5
25
120
20
50
230
mV
mV
mV
Output Voltage, Low (Referred to V–)
No Load
ISINK = 1mA
ISINK = 5mA
l
l
l
5
25
120
25
50
210
5
25
120
30
60
240
mV
mV
mV
60878fd
For more information www.linear.com/LTC6087
3
LTC6087/LTC6088
ELECTRICAL
CHARACTERISTICS
The l denotes the specifications which apply over the full specified
temperature range, otherwise specifications are at TA = 25°C. Test conditions are V+ = 3V, V– = 0V, VCM = 0.5V unless otherwise noted.
C SUFFIX
SYMBOL PARAMETER
CONDITIONS
AVOL
Large-Signal Voltage Gain
RLOAD = 10k, 0.5V ≤ VOUT ≤ 2.5V
ISC
Output Short-Circuit Current
SR
Slew Rate
GBW
Gain Bandwidth Product (fTEST = 20kHz) RLOAD = 50k, VCM = 1.5V
MIN
TYP
l
500
300
l
25
21
Source and Sink
AV = 1
H SUFFIX
MAX
MIN
TYP
3000
500
30
3000
35
25
18
35
mA
mA
7.2
V/µs
14
MHz
MHz
7.2
l
10
9
14
10
8
MAX
UNITS
V/mV
V/mV
F0
Phase Margin
RL = 10k, CL = 5pF, AV = 1, VCM = VS/2
45
45
Deg
tS
Settling Time 0.1%
VSTEP = 2V, AV = –1, RL = 1k
1
1
µs
IS
Supply Current (per Amplifier)
No Load
Shutdown Current (per Amplifier)
l
1.05
1.05
1.20
1.25
1.05
1.05
1.20
1.35
mA
mA
Shutdown, VSHDNx ≤ 0.8V
l
0.2
1
0.2
1
µA
l
Supply Voltage Range
Guaranteed by the PSRR Test
Channel Separation
fS = 10kHz
Shutdown Logic
SHDNx High
SHDNx Low
tON
Turn-On Time
VSHDNx = 0.8V to 2V
6
6
µs
tOFF
Turn-Off Time
VSHDNx = 2V to 0.8V
2
2
µs
Leakage of SHDN Pin
VSHDNx = 0V
VS
2.7
5.5
2.7
–120
2
l
l
0.8
0.1
l
5.5
V
–120
2
0.5
dB
V
V
0.8
0.1
0.5
µA
The l denotes the specifications which apply over the full specified temperature range, otherwise specifications are at TA = 25°C.
Test conditions are V+ = 5V, V– = 0V, VCM = 0.5V unless otherwise noted.
C SUFFIX
SYMBOL PARAMETER
VOS
Offset Voltage (Note 5)
∆VOS/∆T Input Offset Voltage Drift (Note 6)
CONDITIONS
MIN
LTC6087MS8, LTC6088GN
LTC6087DD, LTC6088DHC
LTC6087MS8, LTC6088GN
LTC6087DD, LTC6088DHC
l
l
LTC6087MS8, LTC6088GN
LTC6087DD, LTC6088DHC
l
l
H SUFFIX
TYP
MAX
±330
±330
±2
±2
TYP
MAX
UNITS
±750
±1100
±900
±1350
±330
±330
±750
±1100
±1100
±1600
µV
µV
µV
µV
±5
±5
±2
±2
±5
±5
µV/°C
µV/°C
500
pA
pA
150
pA
pA
IB
Input Bias Current (Notes 5, 7)
IOS
Input Offset Current (Notes 5, 7)
en
Input Noise Voltage Density
f = 1kHz
f = 10kHz
12
10
12
10
nV/√Hz
nV/√Hz
Input Noise Voltage
0.1Hz to 10Hz
2.5
2.5
µVP-P
Input Noise Current Density (Note 8)
f = 1Hz
in
1
MIN
l
0.5
l
Input Common Mode Range
CIN
Input Capacitance
Differential Mode
Common Mode
1
40
0.5
30
0.56
l
V–
f = 100kHz
0.56
V+
2.7
4.2
V–
fA/√Hz
V+
2.7
4.2
V
pF
pF
60878fd
4
For more information www.linear.com/LTC6087
LTC6087/LTC6088
ELECTRICAL
CHARACTERISTICS
The l denotes the specifications which apply over the full specified
temperature range, otherwise specifications are at TA = 25°C. Test conditions are V+ = 5V, V– = 0V, VCM = 0.5V unless otherwise noted.
C SUFFIX
H SUFFIX
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MIN
TYP
CMRR
0V ≤ VCM ≤ 5V
84
70
66
84
l
70
68
dB
dB
93
90
115
93
85
115
l
dB
dB
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
VS = 2.7V to 5.5V
MAX
MAX
UNITS
Output Voltage, High (Referred to V+)
No Load
ISOURCE = 1mA
ISOURCE = 5mA
l
l
l
5
20
110
15
50
190
5
20
110
20
50
210
mV
mV
mV
Output Voltage, Low (Referred to V–)
No Load
ISINK = 1mA
ISINK = 5mA
l
l
l
5
20
110
25
50
200
5
20
110
30
60
220
mV
mV
mV
AVOL
Large-Signal Voltage Gain
RLOAD = 10k, 0.5V ≤ VOUT ≤ 4.5V
ISC
Output Short-Circuit Current
SR
Slew Rate
GBW
Gain Bandwidth Product (fTEST = 20kHz) RLOAD = 50k, VCM = 2.5V
VOUT
1000
500
6000
1000
50
6000
l
28
25
45
28
22
45
l
mA
mA
7.2
V/µs
14
MHz
MHz
47
Deg
Source and Sink
AV = 1
7.2
l
10
9
14
10
8
F0
Phase Margin
RL = 10k, CL = 5pF, AV = 1, VCM = VS/2
tS
Settling Time 0.1%
VSTEP = 2V, AV = –1, RL = 1k
0.8
IS
Supply Current (per Amplifier)
No Load
l
1.05
1.05
1.25
1.30
1.05
1.05
1.25
1.40
mA
mA
Shutdown Current (per Amplifier)
Shutdown, VSHDNx ≤ 1.2V
l
2.3
5
2.3
5
µA
Supply Voltage Range
Guaranteed by the PSRR Test
l
5.5
V
Channel Separation
fS = 10kHz
Shutdown Logic
SHDNx High
SHDNx Low
tON
Turn-On Time
VSHDNx = 1.2V to 3.5V
tOFF
Turn-Off Time
VSHDNx = 3.5V to 1.2V
Leakage of SHDN Pin
VSHDNx = 0V
VS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: A heat sink may be required to keep the junction temperature
below the absolute maximum. This depends on the power supply voltage
and the total output current.
Note 3: The LTC6087C/LTC6088C are guaranteed functional over the
operating temperature range of –40°C to 85°C. The LTC6087H/LTC6088H
are guaranteed functional over the operating temperature range of –40°C
to 125°C.
Note 4: The LTC6087C/LTC6088C are guaranteed to meet specified
performance from 0°C to 70°C. The LTC6087C/LTC6088C are designed,
characterized and expected to meet specified performance from –40°C to
125ºC but are not tested or QA sampled at these temperatures.
47
V/mV
V/mV
2.7
0.8
5.5
2.7
–120
l
l
3.5
l
µs
–120
1.2
3.5
dB
1.2
V
V
6
6
µs
2
2
µs
0.4
1
0.4
1
µA
The LTC6087H/LTC6088H are guaranteed to meet specified performance
from –40°C to 125°C.
Note 5: ESD (electrostatic discharge) sensitive device. ESD protection
devices are used extensively internal to the LTC6087/LTC6088; however,
high electrostatic discharge can damage or degrade the device. Use proper
ESD handling precautions.
Note 6: This parameter is not 100% tested.
Note 7: This specification is limited by high speed automated test
capability. See Typical Performance Characteristic curves for actual
performance.
Note 8: Current noise is calculated from:
in = √2qIB,
where q = 1.6 • 10–19 coulombs.
60878fd
For more information www.linear.com/LTC6087
5
LTC6087/LTC6088
TYPICAL PERFORMANCE CHARACTERISTICS
VOS Distribution
VOS vs VCM
22
0.8
20
0.6
PERCENT OF UNITS (%)
0.4
VOS (mV)
8
6
4
0.2
0
–0.2
–0.4
–0.6 V = 5V
S
–0.8 TA = 25°C
REPRESENTATIVE PARTS
–1.0
0 0.5 1 1.5 2 2.5 3
VCM (V)
2
–1
–0.7 –0.4 –0.1 0.2
VOS (mV)
0.5
0.8
10
8
6
3.5
4
4.5
0
5
100
TA = 85°C
TA = 25°C
1
0.1
–1.2
–0.4 0.4 1.2 2.0
DISTRIBUTION (µV/°C)
80
2.8
60878 G03
VS = 5V
VCM = 2.5V
TA = 25°C
90
TA = 125°C
–2
0.1Hz to 10Hz Output Voltage
Noise
Input Noise Voltage vs Frequency
INPUT NOISE VOLTAGE (nV/√Hz)
INPUT BIAS CURRENT (pA)
12
2
100
VS = 5V
10
14
60878 G02
Input Bias Current vs
Common Mode Voltage
1000
16
LTC6087MS8
VS = 5V
VCM = 2.5V
TA = –40°C TO 125°C
4
60878 G01
10000
18
INPUT NOISE VOLTAGE (1µV/DIV)
PERCENTAGE OF UNITS (%)
LTC6087MS8
VS = 5V
10 VCM = 0.5V
TA = 25°C
0
VOS Drift Distribution
1.0
12
70
60
50
40
30
20
VS = 5V
VCM = 2.5V
10
0
0.5
1 1.5 2 2.5 3 3.5 4 4.5
COMMON MODE VOLTAGE (V)
0
5
10
100
1k
10k
FREQUENCY (Hz)
60878 G05
60878 G06
Supply Current vs Supply Voltage
5.0
500
1.2
PER AMPLIFIER
VCM = 0.5V
1.0 TA = 25°C
VS = 5V
4.5 VCM = 2.5V
400
OUTPUT VOLTAGE SWING (V)
NOISE CURRENT (fA/√Hz)
60878 G07
Output Voltage Swing vs
Load Current
Input Noise Current vs Frequency
300
200
100
4.0
1
10
100
1000
FREQUENCY (Hz)
10000 100000
60878 G04
SOURCE
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
TIME (1s/DIV)
100k
SUPPLY CURRENT (mA)
0.01
0
0.1
TA = 125°C
TA = 25°C
TA = –55°C
SINK
1
10
LOAD CURRENT (mA)
0.8
0.6
0.4
0.2
100
60878 G08
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
SUPPLY VOLTAGE (V)
69878 G09
60878fd
6
For more information www.linear.com/LTC6087
LTC6087/LTC6088
TYPICAL PERFORMANCE CHARACTERISTICS
Open-Loop Gain vs Frequency
80
PER AMPLIFIER
VCM = 0.5V
60
50
VS = 5V
GAIN (dB)
1.1
VS = 3V
1.0
PHASE
0.9
0.8
40
40
GAIN
30
20
20
0
10
–20
0.7
0
0.6
–10
0.5
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
–20
10k
100k
80
1M
10M
FREQUENCY (Hz)
60
VS = 5V
VCM = 2.5V
TA = 25°C
NEGATIVE
SUPPLY
50
40
50
40
30
20
10
0
–10
10k
30
20
10
10k
100k
1M
FREQUENCY (Hz)
10M
100M
10
AV = 10
1
AV = 2
AV = 1
0.1
0.001
10k
10M
100k 1M
FREQUENCY (Hz)
VS = 5V
AV = 1
RL = ∞
100M
Small-Signal Response
Large-Signal Response
60878 G16
60878 G15
Large-Signal Response
1V/DIV
1V/DIV
200ns/DIV
200ns/DIV
60878 G14
60878 G13
VS = 5V
AV = 1
RL = ∞
CL = 33pF
100M
VS = 5V
VCM = 2.5V
100 TA = 25°C
0.01
1k
1M
10M
FREQUENCY (Hz)
Small-Signal Response
0
–10
100k
60878 G12
Output Impedance vs Frequency
100mV/DIV
PSRR (dB)
70
–80
100M
60
1000
OUTPUT IMPEDANCE (Ω)
POSITIVE
SUPPLY
70
60878 G11
PSRR vs Frequency
90
80
–60
60878 G10
100
90
–40
VS = 5V
VS = 3V
VS = 5V
VCM = 2.5V
RL = 1k
TA = 25°C
100
PHASE (DEG)
SUPPLY CURRENT (mA)
1.3
1.2
CL = 5pF
100
RL = 1k
VCM = VS/2
80
TA = 25°C
60
70
100mV/DIV
1.4
CMRR vs Frequency
110
120
CMRR (dB)
Supply Current vs Temperature
1.5
VS = 5V
AV = 1
RL = ∞
2µs/DIV
60878 G17
VS = 5V
AV = –1
RL = 1k
1µs/DIV
60878 G18
60878fd
For more information www.linear.com/LTC6087
7
LTC6087/LTC6088
TYPICAL PERFORMANCE CHARACTERISTICS
Disabled Output Impedance
vs Frequency
VS = 5V
VCM = 1V
AV = 1
TA = 25°C
10000
1000
100
10
1
RS = 50Ω
40
30
–
+
10
10k
100k
FREQUENCY (Hz)
1k
1M
0
10M
VS = 5V
35 VCM = 2.5V
AV = –1
30
RS = 10Ω
50
20
0.1
100
40
VS = 5V
70 VCM = 2.5V
AV = 1
60
OVERSHOOT (%)
OUTPUT IMPEDANCE (kΩ)
100000
15
CL
–
+
RS
CL
RS = 50Ω
5
0
1000
100
CAPACITIVE LOAD (pF)
10
1
VS = 5V
VCM = 2.5V
TA = 25°C
1000
60878 G22
Total Harmonic Distortion + Noise
vs Frequency
Total Harmonic Distortion + Noise
vs Frequency
0.1
VS = 3V
VCM = 1.5V
RL = 10k
VS = 5V
VCM = 2.5V
RL = 10k
–100
–105
–110
–115
0.1
THD + NOISE (%)
THD + NOISE (%)
CHANNEL SEPARATON (dB)
1k
60878 G21
Channel Separation vs Frequency
–95
RS = 10Ω
1k
20
10
100
CAPACITIVE LOAD (pF)
10
30pF
25
RS
60878 G20
–90
Overshoot vs Capacitive Load
Overshoot vs Capacitive Load
80
OVERSHOOT (%)
1000000
AV = 1, VIN = 2VP-P
AV = 1, VIN = 1VP-P
0.01
0.01
–120
–130
0.01
AV = 1, VIN = 1VP-P
AV = –2, VIN = 1VP-P
–125
AV = 1, VIN = 2VP-P
AV = 2, VIN = 1VP-P
0.1
1
10
FREQUENCY (MHz)
100
0.001
0.01
0.1
1
10
FREQUENCY (kHz)
60878 G23
100
0.1
VS = 5V
AT 20kHz
VS = 5V
AT 1kHz
100
60878 G25
AV = 1
VCM = VS/2 AT 1kHz
0.01
VS = 5V, VIN = 2VP-P
0.001
0.001
0.0001
1
10
FREQUENCY (kHz)
VS = 3V, VIN = 1VP-P
THD + NOISE (%)
THD + NOISE (%)
0.01
0.1
Total Harmonic Distortion + Noise
vs Load Resistance
0.1
VS = 3V
AT 1kHz
0.001
0.01
60878 G24
Total Harmonic Distortion + Noise
vs Output Voltage
VS = 3V
AT 20kHz
AV = 2, VIN = 1VP-P
AV = –2, VIN = 1VP-P
RL = 10k
VCM = VS/2
AV = 1
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
OUTPUT VOLTAGE (VP-P)
0.0001
0.1
60878 G26
1
10
LOAD RESISTANCE TO GROUND (kΩ)
100
60878 G27
60878fd
8
For more information www.linear.com/LTC6087
LTC6087/LTC6088
PIN FUNCTIONS
OUT: Amplifier Output.
SHDNA: Shutdown Pin of Amplifier A, active low and only
available with the LTC 6087DD. An internal current source
pulls the pin to V+ when floating.
–IN: Inverting Input.
+IN: Noninverting Input.
SHDNB: Shutdown Pin of Amplifier B, active low and only
available with the LTC 6087DD. An internal current source
pulls the pin to V+ when floating.
V+: Positive Supply.
V–: Negative Supply.
NC: Not internally connected
Exposed Pad: Connected to V–.
APPLICATIONS INFORMATION
GN package. With fine PCB design rules, you can also
provide a guard ring around the inputs.
Rail-to-Rail Input
The input stage of LTC6087/LTC6088 combines both PMOS
and NMOS differential pairs, extending its input common
mode voltage to both positive and negative supply voltages.
At high input common mode range, the NMOS pair is on.
At low common mode range, the PMOS pair is on. The
transition happens when the common voltage is between
1.3V and 0.9V below the positive supply.
Achieving Low Input Bias Current
The DD and DHC packages are leadless and make contact
to the PCB beneath the package. Solder flux used during
the attachment of the part to the PCB can create leakage
current paths and can degrade the input bias current performance of the part. All inputs are susceptible because
the backside paddle is connected to V– internally. As the
input voltage or V– changes, a leakage path can be formed
and alter the observed input bias current. For lowest bias
current use the LTC6087/LTC6088 in the leaded MSOP/
For example, in high source impedance applications such
as pH probes, photo diodes, strain gauges, et cetera, the
low input bias current of these parts requires a clean
board layout to minimize additional leakage current into a
high impedance signal node. A mere 100GΩ of PC board
resistance between a 5V supply trace and input trace near
ground potential adds 50pA of leakage current. This leakage is far greater than the bias current of the operational
amplifier. A guard ring around the high impedance input
traces driven by a low impedance source equal to the
input voltage prevents such leakage problems. The guard
ring should extend as far as necessary to shield the high
impedance signal from any and all leakage paths. Figure
1 shows the use of a guard ring in a unity-gain configuration. In this case the guard ring is connected to the output
and is shielding the high impedance noninverting input
from V–. Figure 2 shows the inverting gain configuration.
OUT
R
NO SOLDER MASK
OVER THE GUARD RING
NO LEAKAGE
CURRENT
OUT
LTC6087
IN–
R
LTC6087
IN–
VIN
R
IN+
IN+
LEAKAGE
CURRENT
GND
GUARD
RING
V–
V–
60878 F01
Figure 1. Sample Layout. Unity-Gain Configuration. Using Guard
Ring to Shield High Impedance Input from Board Leakage
60878 F02
Figure 2. Sample Layout. Inverting Gain Configuration. Using
Guard Ring to Shield High Impedance Input from Board Leakage
For more information www.linear.com/LTC6087
60878fd
9
LTC6087/LTC6088
APPLICATIONS INFORMATION
Rail-to-Rail Output
The output stage of the LTC6087/LTC6088 swings within
30mV of the supply rails when driving high impedance
loads, in other words when no DC load current is present.
See the Typical Performance Characteristics for curves of
output swing versus load current. The class AB design of
the output stage enables the op amp to supply load currents which are much greater than the quiescent supply
current. For example, the room temperature short circuit
current is typically 45mA.
5V
10k
10k
5V
+
INA
LTC6087
(DD PACKAGE)
A
10k
–
SHDN
A
10k
5V
10k
+
10k
INB
OUT
10pF
B
10k
–
Capacitive Load
10pF
SEL = 5V, OUT = –INA
SEL = 0V, OUT = –1NB
10k
LTC6087/LTC6088 can drive capacitive load up to 100pF in
unity gain. The capacitive load driving capability increases
as the amplifier is used in higher gain configurations. A
small series resistance between the output and the load
further increases the amount of capacitance the amplifier
can drive.
5V
SEL
SHDN
B
FAIRCHILD
NC7SZ04 OR
EQUIVALENT
60878 F03
Figure 3. Inverting Amplifier with Muxed Output
SHDN Pins
Noise
Pins 5 and 6 are used for power shutdown when the
LTC6087 is in the DD package. If they are floating, internal
current sources pull Pins 5 and 6 to V+ and the amplifiers
operate normally. In shutdown the amplifier output is
high impedance and each amplifier draws less than 5µA
current. This feature allows the part to be used in muxed
output applications as shown in Figure 3.
In the frequency region above 1kHz, the LTC6087/LTC6088
shows good noise voltage performance. In this region,
noise can be dominated by the total source resistance of
the particular application. Specifically, these amplifiers
exhibit the noise of a 10k resistor, meaning it is desirable
to keep the source and feedback resistance at or below
this value, i.e., RS + RG||RFB ≤ 10k. Above this total source
impedance, the noise voltage is dominated by the resistor.
ESD
The LTC6087/LTC6088 has reverse-biased ESD protection
diodes on all inputs and outputs as shown in the Simplified
Schematic. If these pins are forced beyond either supply,
unlimited current will flow through these diodes. If the
current is transient and limited to one hundred milliamps
or less, no damage to the device will occur.
At low frequency, noise current can be estimated from the
expression in = √2qIB, where q = 1.6 • 10–19 coulombs.
Equating √4kTR∆f and R√2qIB∆f shows that for source
resistor below 50GΩ the amplifier noise is dominated by
the source resistance. Noise current rises with frequency.
See the curve Noise Current vs Frequency in the Typical
Performance Characteristics section.
The amplifier input bias current is the leakage current of
these ESD diodes. This leakage is a function of the temperature and common mode voltage of the amplifier, as
shown in the Typical Performance Characteristics.
60878fd
10
For more information www.linear.com/LTC6087
LTC6087/LTC6088
SIMPLIFIED SCHEMATIC
V+
R1
M10
R2
M11
1µA
M8
V–
I1
V+
I2
VBIAS
D4
C1
+
–
A1
M5
V+
+IN
V+
D7
V+
D3
M1
OUTPUT
CONTROL
M6 M7
M2
D6
V–
D8
–IN
V–
D5
D2
BIAS
GENERATION
SHDN
OUT
A2
+
–
V–
C2
D1
NOTE: SHDN IS ONLY AVAILABLE
V– IN THE DFN10 PACKAGE
M9
M4
M3
R3
R4
V–
60878 SS
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/product/LTC6087#packaging for the most recent package drawings.
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660 Rev G)
3.00 ±0.102
(.118 ±.004)
(NOTE 3)
0.889 ±0.127
(.035 ±.005)
5.10
(.201)
MIN
0.42 ± 0.038
(.0165 ±.0015)
TYP
3.20 – 3.45
(.126 – .136)
0.65
(.0256)
BSC
0.254
(.010)
8
7 6 5
3.00 ±0.102
(.118 ±.004)
(NOTE 4)
4.90 ±0.152
(.193 ±.006)
DETAIL “A”
0.52
(.0205)
REF
0° – 6° TYP
GAUGE PLANE
0.53 ±0.152
(.021 ±.006)
RECOMMENDED SOLDER PAD LAYOUT
DETAIL “A”
1
1.10
(.043)
MAX
2 3
4
0.86
(.034)
REF
0.18
(.007)
SEATING
PLANE
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED
0.152mm (.006") PER SIDE
0.22 – 0.38
(.009 – .015)
TYP
0.65
(.0256)
BSC
0.1016 ±0.0508
(.004 ±.002)
MSOP (MS8) 0213 REV G
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE
0.102mm (.004") MAX
60878fd
For more information www.linear.com/LTC6087
11
LTC6087/LTC6088
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/product/LTC6087#packaging for the most recent package drawings.
DD Package
10-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1699 Rev C)
0.70 ±0.05
3.55 ±0.05
1.65 ±0.05
2.15 ±0.05 (2 SIDES)
PACKAGE
OUTLINE
0.25 ±0.05
0.50
BSC
2.38 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
3.00 ±0.10
(4 SIDES)
R = 0.125
TYP
6
0.40 ±0.10
10
1.65 ±0.10
(2 SIDES)
PIN 1 NOTCH
R = 0.20 OR
0.35 × 45°
CHAMFER
PIN 1
TOP MARK
(SEE NOTE 6)
0.200 REF
0.75 ±0.05
0.00 – 0.05
5
1
(DD) DFN REV C 0310
0.25 ±0.05
0.50 BSC
2.38 ±0.10
(2 SIDES)
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2).
CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
60878fd
12
For more information www.linear.com/LTC6087
LTC6087/LTC6088
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/product/LTC6087#packaging for the most recent package drawings.
GN Package
16-Lead Plastic SSOP (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1641 Rev B)
.189 – .196*
(4.801 – 4.978)
.045 ±.005
16 15 14 13 12 11 10 9
.254 MIN
.009
(0.229)
REF
.150 – .165
.229 – .244
(5.817 – 6.198)
.0165 ±.0015
.150 – .157**
(3.810 – 3.988)
.0250 BSC
RECOMMENDED SOLDER PAD LAYOUT
1
.015 ±.004
× 45°
(0.38 ±0.10)
.007 – .0098
(0.178 – 0.249)
.0532 – .0688
(1.35 – 1.75)
2 3
4
5 6
7
8
.004 – .0098
(0.102 – 0.249)
0° – 8° TYP
.016 – .050
(0.406 – 1.270)
.008 – .012
(0.203 – 0.305)
TYP
NOTE:
1. CONTROLLING DIMENSION: INCHES
INCHES
2. DIMENSIONS ARE IN
(MILLIMETERS)
.0250
(0.635)
BSC
GN16 REV B 0212
3. DRAWING NOT TO SCALE
4. PIN 1 CAN BE BEVEL EDGE OR A DIMPLE
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
60878fd
For more information www.linear.com/LTC6087
13
LTC6087/LTC6088
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/product/LTC6087#packaging for the most recent package drawings.
DHC Package
16-Lead Plastic DFN (5mm × 3mm)
(Reference LTC DWG # 05-08-1706 Rev Ø)
0.65 ±0.05
3.50 ±0.05
1.65 ±0.05
2.20 ±0.05 (2 SIDES)
PACKAGE
OUTLINE
0.25 ± 0.05
0.50 BSC
4.40 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
5.00 ±0.10
(2 SIDES)
R = 0.20
TYP
3.00 ±0.10
(2 SIDES)
9
R = 0.115
TYP
0.40 ±0.10
16
1.65 ±0.10
(2 SIDES)
PIN 1
TOP MARK
(SEE NOTE 6)
PIN 1
NOTCH
0.200 REF
0.75 ±0.05
0.00 – 0.05
8
1
0.25 ±0.05
0.50 BSC
(DHC16) DFN 1103
4.40 ±0.10
(2 SIDES)
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJED-1) IN JEDEC
PACKAGE OUTLINE MO-229
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
60878fd
14
For more information www.linear.com/LTC6087
LTC6087/LTC6088
REVISION HISTORY
(Revision history begins at Rev C)
REV
DATE
DESCRIPTION
C
7/12
Corrected Supply Current value.
PAGE NUMBER
Provided VCM condition for GBW specification.
4, 5
D
6/17
Provided VCM condition for Phase Margin specification.
4, 5
1
60878fd
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection
of its circuits
as described
herein will not infringe on existing patent rights.
For more
information
www.linear.com/LTC6087
15
LTC6087/LTC6088
TYPICAL APPLICATIONS
Negative-Going and Positive-Going Photodiode TIAs on ±5V Supplies
CF
2pF
RF
100k
5V
1.5k
5V
1N4148
IPD
+
PHOTODIODE
~3pF
VOUT
0V – IPD • RF
1/2 LTC6087
–
IPD
5V
–
PHOTODIODE
~3pF
+
1N4148
–5V
RF
–5V 100k
1.5k
NOTE: DIFFERENT DEVICES.
NOT THE SAME LTC6087
CF
2pF
VOUT
0V + IPD • RF
1/2 LTC6087
60878 TA02
–5V
Almost Rail-to-Rail (0.3V to VCC) Gain-of-30 Current Sense Amplifier
LOAD
–
VSENSE
ISENSE
+
VS
RSENSE
100Ω
1%
GAIN OF 2 STAGE
VCC
+
RCOMP
10k
GAIN OF 15 STAGE
1/2 LTC6087
–
CCOMP
1nF
2N7002
+
200Ω
1%
FULL-SCALE VSENSE = 100mV (3V OUT).
FOR SMALL SIGNALS, INPUT OPERATION IS
RAIL-TO-RAIL (VS = 5mV to VCC).
FOR FULL SCALE, INPUT OPERATION IS 0.3V TO RAIL.
WORST-CASE INPUT OFFSET VOLTAGE = 1.8mV.
1/2 LTC6087
–
OUT
140k
1%
10k
1%
60878 TA03
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC2051/LTC2052
Dual/Quad Zero-Drift Op Amps
3µV VOS(MAX), 30nV/°C VOS Drift (MAX)
LTC6078/LTC6079
Dual/Quad Micropower Precision Rail-to-Rail Op Amps 25µV VOS(MAX), 0.7µV/°C VOS Drift (MAX), 1pA IBIAS(MAX)
LTC6240
Single Low Noise Rail-to-Rail Output Op Amp
7nV/√Hz Noise, 1pA IBIAS(MAX), 10V/µs Slew Rate
LTC6241/LTC6242
Dual/Quad Low Noise Rail-to-Rail Output Op Amps
7nV/√Hz Noise, 0.2pA IBIAS, 18MHz Gain Bandwidth
LTC6244
Dual 50MHz Rail-to-Rail Op Amps
100µV VOS(MAX), 1pA IBIAS, 40V/µs Slew Rate
60878fd
16
LT 0617 REV D • PRINTED IN USA
For more information www.linear.com/LTC6087
www.linear.com/LTC6087
LINEAR TECHNOLOGY CORPORATION 2007
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