LTC6800
Rail-to-Rail
Input and Output,
Instrumentation Amplifier
FEATURES
s
s
s
s
s
s
s
s
DESCRIPTIO
116dB CMRR Independent of Gain
Maximum Offset Voltage: 100µV
Maximum Offset Voltage Drift: 250nV/°C
– 40°C to 125°C Operation
Rail-to-Rail Input Range
Rail-to-Rail Output Swing
Supply Operation: 2.7V to 5.5V
Available in an MS8 and 3mm
×
3mm
×
0.8mm
DFN Packages
The LTC
®
6800 is a precision instrumentation amplifier.
The CMRR is typically 116dB with a single 5V supply and
is independent of gain. The input offset voltage is guaran-
teed below 100µV with a temperature drift of less than
250nV/°C. The LTC6800 is easy to use; the gain is adjust-
able with two external resistors, like a traditional op amp.
The LTC6800 uses charge balanced sampled data tech-
niques to convert a differential input voltage into a single
ended signal that is in turn amplified by a zero-drift
operational amplifier.
The differential inputs operate from rail-to-rail and the
single ended output swings from rail-to-rail. The LTC6800
is available in an MS8 surface mount package. For space
limited applications, the LTC6800 is available in a
3mm
×
3mm
×
0.8mm dual fine pitch leadless package
(DFN).
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
Thermocouple Amplifiers
Electronic Scales
Medical Instrumentation
Strain Gauge Amplifiers
High Resolution Data Acquisition
TYPICAL APPLICATIO
High Side Power Supply Current Sense
1.5mΩ
V
REGULATOR
Typical Input Referred Offset vs
Input Common Mode Voltage (V
S
= 3V)
15
10
V
S
= 3V
V
REF
= 0V
T
A
= 25°C
6
5
4
10k
0.1µF
V
OS
(µV)
+
3
–
2
8
7
LTC6800
OUT
100mV/A
OF LOAD
CURRENT
I
LOAD
5
0
–5
G = 10
–10
6800 TA01
LOAD
150Ω
–15
0
1
1.5
2
2.5
0.5
INPUT COMMON MODE VOLTAGE (V)
U
G = 1000
G = 100
G=1
3
6800 TA02
U
U
6800fa
1
LTC6800
ABSOLUTE
(Note 1)
AXI U RATI GS
Operating Temperature Range
(Note 7) ................................................ – 40°C to 125°C
Storage Temperature Range
MS8 Package ................................... – 65°C to 150°C
DD Package ...................................... – 65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Total Supply Voltage (V
+
to V
–
) .............................. 5.5V
Input Current ......................................................
±10mA
V
IN+
– V
REF
........................................................
5.5V
V
IN–
– V
REF
........................................................
5.5V
Output Short Circuit Duration .......................... Indefinite
PACKAGE/ORDER I FOR ATIO
LTC6800HMS8
TOP VIEW
NC 1
–IN 2
+IN 3
4
V
–
8
7
6
5
V
+
OUT
RG
REF
ORDER PART NUMBER
NC
–IN
+IN
–
MS8 PART MARKING
LTADE
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 200°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
+
= 3V, V
–
= 0V, REF = 200mV. Output voltage swing is referenced
to V
–
. All other specifications reference the OUT pin to the REF pin.
PARAMETER
Input Offset Voltage (Note 2)
Average Input Offset Drift (Note 2)
Common Mode Rejection Ratio
(Notes 4, 5)
Integrated Input Bias Current (Note 3)
Integrated Input Offset Current (Note 3)
Input Noise Voltage
Power Supply Rejection Ratio (Note 6)
Output Voltage Swing High
Output Voltage Swing Low
Gain Error
Gain Nonlinearity
A
V
= 1
A
V
= 1
CONDITIONS
V
CM
= 200mV
T
A
= –40°C to 85°C
T
A
= 85°C to 125°C
A
V
= 1, V
CM
= 0V to 3V
V
CM
= 1.2V
V
CM
= 1.2V
DC to 10Hz
V
S
= 2.7V to 5.5V
R
L
= 2k to V
–
R
L
= 10k to V
–
q
q
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
2
U
U
W
W W
U
W
TOP VIEW
1
2
3
4
8 V
+
7 OUT
6 RG
5 REF
ORDER PART NUMBER
LTC6800HDD
V
DD PART MARKING
LAEP
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 160°C/W
UNDERSIDE METAL INTERNALLY
CONNECTED TO V
–
(PCB CONNECTION OPTIONAL)
MIN
TYP
MAX
±100
±250
–2.5
UNITS
µV
nV/°C
µV/°C
dB
–1
90
113
4
1
2.5
110
2.85
2.95
116
2.94
2.98
10
3
nA
nA
µV
P-P
dB
V
V
20
0.1
100
mV
%
ppm
6800fa
LTC6800
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
+
= 3V, V
–
= 0V, REF = 200mV. Output voltage swing is referenced
to V
–
. All other specifications reference the OUT pin to the REF pin.
PARAMETER
Supply Current
Internal Op Amp Gain Bandwidth
Slew Rate
Internal Sampling Frequency
CONDITIONS
No Load
q
ELECTRICAL CHARACTERISTICS
MIN
TYP
200
0.2
3
MAX
1.2
UNITS
mA
kHz
V/µs
kHz
The
q
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C. V
+
= 5V,
V
–
= 0V, REF = 200mV. Output voltage swing is referenced to V
–
. All other specifications reference the OUT pin to the REF pin.
PARAMETER
Input Offset Voltage (Note 2)
Average Input Offset Drift (Note 2)
Common Mode Rejection Ratio
(Notes 4, 5)
Integrated Input Bias Current (Note 3)
Integrated Input Offset Current (Note 3)
Power Supply Rejection Ratio (Note 6)
Output Voltage Swing High
Output Voltage Swing Low
Gain Error
Gain Nonlinearity
Supply Current
Internal Op Amp Gain Bandwidth
Slew Rate
Internal Sampling Frequency
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
These parameters are guaranteed by design. Thermocouple effects
preclude measurement of these voltage levels in high speed automatic test
systems. V
OS
is measured to a limit determined by test equipment
capability.
Note 3:
If the total source resistance is less than 10k, no DC errors result
from the input bias currents or the mismatch of the input bias currents or
the mismatch of the resistances connected to –IN and +IN.
Note 4:
The CMRR with a voltage gain, A
V
, larger than 10 is 120dB (typ).
Note 5:
At temperatures above 70°C, the common mode rejection ratio
lowers when the common mode input voltage is within 100mV of the
supply rails.
A
V
= 1
A
V
= 1
No Load
q
CONDITIONS
V
CM
= 200mV
T
A
= –40°C to 85°C
T
A
= 85°C to 125°C
A
V
= 1, V
CM
= 0V to 5V
V
CM
= 1.2V
V
CM
= 1.2V
V
S
= 2.7V to 5.5V
R
L
= 2k to V
–
R
L
= 10k to V
–
q
q
q
q
q
q
q
MIN
TYP
MAX
±100
±250
–2.5
UNITS
µV
nV/°C
µV/°C
dB
–1
90
116
4
1
110
4.85
4.95
116
4.94
4.98
10
3
nA
nA
dB
V
V
20
0.1
100
1.3
200
0.2
3
mV
%
ppm
mA
kHz
V/µs
kHz
Note 6:
The power supply rejection ratio (PSRR) measurement accuracy
depends on the proximity of the power supply bypass capacitor to the
device under test. Because of this, the PSRR is 100% tested to relaxed
limits at final test. However, their values are guaranteed by design to meet
the data sheet limits.
Note 7:
The LTC6800H is guaranteed functional over the operating
temperature range of –40°C to 125°C. Specifications over the –40°C to
125°C range (denoted by
q
) are assured by design and characterization
but are not tested or QA sampled at these temperatures.
6800fa
3
LTC6800
TYPICAL PERFOR A CE CHARACTERISTICS
Input Offset Voltage
vs Input Common Mode Voltage
15
10
5
0
–5
G = 10
–10
G=1
–15
0
1.0
1.5
2.0
2.5
0.5
INPUT COMMON MODE VOLTAGE (V)
3.0
V
S
= 3V
V
REF
= 0V
T
A
= 25°C
INPUT OFFSET VOLTAGE (µV)
INPUT OFFSET VOLTAGE (µV)
INPUT OFFSET VOLTAGE (µV)
G = 1000
G = 100
Input Offset Voltage
vs Input Common Mode Voltage
20
V
S
= 5V
V
REF
= 0V
15
G = 10
10
5
0
T
A
= 70°C
–5
T
A
= 25°C
–10
–15
–20
0
T
A
= –55°C
2
3
4
1
INPUT COMMON MODE VOLTAGE (V)
5
–60
60
40
20
0
–20
–40
INPUT OFFSET VOLTAGE (µV)
INPUT OFFSET VOLTAGE (µV)
INPUT OFFSET VOLTAGE (µV)
Additional Input Offset Due to
Input R
S
vs Input Common Mode
(C
IN
< 100pF)
60
ADDITIONAL OFFSET ERROR (µV)
40
20
0
R
S
= 10k
–20
–40
–60
R
S
SMALL C
IN
R
S
0
1.0
1.5
2.0
2.5
0.5
INPUT COMMON MODE VOLTAGE (V)
3.0
+
–
R
S
= 15k
R
S
= 20k
ADDITIONAL OFFSET ERROR (µV)
ADDITIONAL OFFSET ERROR (µV)
V
S
= 3V
V
REF
= 0V
R
+
= R
–
= R
S
C
IN
< 100pF
G = 10
T
A
= 25°C
R
S
= 5k
R
S
= 0k
4
U W
6800 G01
6800 G04
6800 G07
Input Offset Voltage
vs Input Common Mode Voltage
15
V
S
= 5V
V
REF
= 0V
10 T
A
= 25°C
5
0
–5
G = 10
–10
–15
G = 100
G=1
G = 1000
20
Input Offset Voltage
vs Input Common Mode Voltage
V
S
= 3V
15 V
REF
= 0V
G = 10
10
5
0
T
A
= 70°C
–5
–10
–15
T
A
= 25°C
T
A
= –55°C
0
2
3
4
1
INPUT COMMON MODE VOLTAGE (V)
5
–20
0
1.0
1.5
2.0
2.5
0.5
INPUT COMMON MODE VOLTAGE (V)
3.0
2053 G02
6800 G03
Input Offset Voltage vs Input
Common Mode Voltage,
85°C
≤
T
A
≤
125°C
V
S
= 3V
V
REF
= 0V
G = 10
60
40
20
0
Input Offset Voltage vs Input
Common Mode Voltage,
85°C
≤
T
A
≤
125°C
V
S
= 5V
V
REF
= 0V
G = 10
T
A
= 85°C
T
A
= 85°C
–20
–40
–60
T
A
= 125°C
T
A
= 125°C
0
2
3
4
1
INPUT COMMON MODE VOLTAGE (V)
5
0
1.0
1.5
2.0
2.5
0.5
INPUT COMMON MODE VOLTAGE (V)
3.0
6800 G05
6800 G06
Additional Input Offset Due to
Input R
S
vs Input Common Mode
(C
IN
< 100pF)
30
V
S
= 5V
V
REF
= 0V
+
–
20 R
IN
= R
IN
= R
S
C
IN
< 100pF
G = 10
10 T
A
= 25°C
0
–10
50
R
S
= 20k
40
30
20
10
0
–10
–20
–30
–40
–50
5
Additional Input Offset Due to Input
R
S
Mismatch vs Input Common
Mode (C
IN
< 100pF)
V
S
= 3V
V
REF
= 0V
C
IN
< 100pF
G = 10
T
A
= 25°C
R
+
= 0k, R
–
= 15k
R
+
= 0k, R
–
= 10k
R
S
= 15k
R
S
= 10k
R
S
= 5k
R
+
= 0k, R
–
= 5k
R
S
+
–
–20 SMALL C
IN
–30
R
S
0
R
+
= 5k, R
–
= 0k
R
+
= 10k, R
–
= 0k
R
+
+
SMALL C
IN
–
–
R
R
+
=15k, R
–
= 0k
0
2.5
1.0
1.5
2.0
0.5
INPUT COMMON MODE VOLTAGE (V)
3.0
2
3
4
1
INPUT COMMON MODE VOLTAGE (V)
6800 G08
6800 G09
6800fa
LTC6800
TYPICAL PERFOR A CE CHARACTERISTICS
Additional Input Offset Due to Input
R
S
Mismatch vs Input Common
Mode (C
IN
< 100pF)
40
ADDITIONAL OFFSET ERROR (µV)
ADDITIONAL OFFSET ERROR (µV)
ADDITIONAL OFFSET ERROR (µV)
V
S
= 5V
R
IN+
= 0k, R
IN–
= 20k
30 V
REF
= 0V
C
IN
< 100pF
R
IN+
= 0k, R
IN–
= 15k
20 G = 10
R
IN+
= 0k, R
IN–
= 10k
T
A
= 25°C
R
IN+
= 10k, R
IN–
= 0k
10
0
–10
–20
–30
–40
0
R
IN+
= 15k, R
IN–
= 0k
R
IN+
= 20k, R
IN–
= 0k
R
+
SMALL C
IN
R
–
+
–
5
2
3
4
1
INPUT COMMON MODE VOLTAGE (V)
Additional Input Offset Due to
Input R
S
Mismatch vs Input
Common Mode (C
IN
> 1µF)
200
ADDITIONAL OFFSET ERROR (µV)
ADDITIONAL OFFSET ERROR (µV)
INPUT OFFSET VOLTAGE (µV)
V
S
= 3V
V
REF
= 0V
150
T
A
= 25°C
G = 10
100
50
0
–50
R
+
BIG C
IN
R
–
R
+
= 0Ω, R
–
= 1k
R
+
= 0Ω, R
–
= 500Ω
R
+
= 0Ω, R
–
= 100Ω
R
+
= 100Ω, R
–
= 0Ω
R
+
= 500Ω, R
–
= 0Ω
+
–
–100
–150
–200
0
R
+
= 1k, R
–
= 0Ω
1.0
1.5
2.0
2.5
0.5
INPUT COMMON MODE VOLTAGE (V)
V
OS
vs V
REF
30
20
10
V
OS
(µV)
V
IN+
= V
IN –
= REF
G = 10
T
A
= 25°C
NONLINEARITY (ppm)
4
2
0
–2
–4
–6
–8
NONLINEARITY (ppm)
0
–10
–20
–30
V
S
= 3V
V
S
= 5V
0
1
2
V
REF
(V)
U W
6800 G10
6800 G13
Additional Input Offset Due to
Input R
S
vs Input Common Mode
(C
IN
> 1µF)
40
V
S
= 3V
V
REF
= 0V
30
+
R = R
–
= R
S
C > 1µF
20 G
IN
10
=
T
A
= 25°C
10
0
–10
–20
–30
–40
0
R
S
BIG C
IN
R
S
2.5
1.0
1.5
2.0
0.5
INPUT COMMON MODE VOLTAGE (V)
3.0
+
–
Additional Input Offset Due to
Input R
S
vs Input Common Mode
(C
IN
> 1µF)
70
50
30
10
–10
–30
–50
–70
0
R
S
BIG C
IN
R
S
+
–
R
S
= 10k
R
S
= 5k
R
S
= 1k
R
S
= 500Ω
V
S
= 5V
V
REF
= 0V
R
+
= R
–
= R
S
C
IN
> 1µF
G = 10
T
A
= 25°C
5
R
S
= 15k
R
S
= 10k
R
S
= 5k
2
3
4
1
INPUT COMMON MODE VOLTAGE (V)
6800 G11
6800 G12
Additional Input Offset Due to
Input R
S
Mismatch vs Input
Common Mode (C
IN
> 1µF)
V
S
= 5V
V
REF
= 0V
150
T
A
= 25°C
G = 10
100
50
0
–50
–100
–150
–200
0
R
+
BIG C
IN
R
–
Offset Voltage vs Temperature
80
60
40
20
0
V
S
= 3V
–20
–40
–60
V
S
= 5V
200
R
+
= 0Ω, R
–
= 1k
R
+
= 0Ω, R
–
= 500Ω
R
+
= 0Ω, R
–
= 100Ω
R = 100Ω, R = 0Ω
R
+
= 500Ω, R
–
= 0Ω
+
–
+
–
R
+
= 1k, R
–
= 0Ω
3.0
4
3
INPUT COMMON MODE VOLTAGE (V)
1
2
5
–80
–50 –25
0
25
50
75
100
125
TEMPERATURE (°C)
6800 G15
6800 G14
Gain Nonlinearity, G = 1
10
8
6
V
S
=
±2.5V
V
REF
= 0V
G=1
R
L
= 10k
T
A
= 25°C
10
Gain Nonlinearity, G = 10
V
S
=
±2.5V
8 V
REF
= 0V
G = 10
6
R
L
= 10k
4 T
A
= 25°C
2
0
–2
–4
–6
–8
1.1
1.6
–10
–2.4
–1.4
–0.4
0.6
1.6
OUTPUT VOLTAGE (V)
2.6
6800 G18
3
4
6800 G16
–10
–2.4 –1.9 –1.4 –0.9 –0.4 0.1 0.6
OUTPUT VOLTAGE (V)
6800 G17
6800fa
5
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