LTC6800HMS8#TRPBF [Linear]
LTC6800 - Rail-to-Rail, Input and Output, Instrumentation Amplifier; Package: MSOP; Pins: 8; Temperature Range: -40°C to 125°C;型号: | LTC6800HMS8#TRPBF |
厂家: | Linear |
描述: | LTC6800 - Rail-to-Rail, Input and Output, Instrumentation Amplifier; Package: MSOP; Pins: 8; Temperature Range: -40°C to 125°C 放大器 光电二极管 |
文件: | 总14页 (文件大小:1244K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LTC6800
Rail-to-Rail,
Input and Output,
Instrumentation Amplifier
FeaTures
DescripTion
The LTC®6800 is a precision instrumentation amplifier.
TheCMRRistypically116dBwithasingle5Vsupplyandis
independentofgain.Theinputoffsetvoltageisguaranteed
below100µVwithatemperaturedriftoflessthan250nV/°C.
The LTC6800 is easy to use; the gain is adjustable with
two external resistors, like a traditional op amp.
n
116dB CMRR Independent of Gain
n
Maximum Offset Voltage: 100µV
n
Maximum Offset Voltage Drift: 250nV/°C
n
–40°C to 125°C Operation
n
Rail-to-Rail Input Range
n
Rail-to-Rail Output Swing
n
Supply Operation: 2.7V to 5.5V
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.
n
Available in MS8 and 3mm × 3mm × 0.8mm
DFN Packages
applicaTions
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).
n
Thermocouple Amplifiers
n
Electronic Scales
n
Medical Instrumentation
Strain Gauge Amplifiers
High Resolution Data Acquisition
n
n
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion
Typical Input Referred Offset vs Input
Common Mode Voltage (VS = 3V)
High Side Power Supply Current Sense
15
1.5mΩ
V
V
A
= 3V
REF
= 25°C
S
V
REGULATOR
= 0V
10
5
T
–
2
8
OUT
7
100mV/A
OF LOAD
CURRENT
3 +LTC6800
0
6
10k
0.1µF
G = 1000
5
4
G = 100
–5
–10
–15
I
LOAD
LOAD
G = 10
150Ω
G = 1
2.5
6800 TA01
0
1
1.5
2
3
0.5
INPUT COMMON MODE VOLTAGE (V)
6800 TA02
6800fb
ꢀ
LTC6800
(Note 1)
absoluTe MaxiMuM raTings
+
–
Total Supply Voltage (V to V ) ...............................5.5V
Input Current........................................................ 10mA
Storage Temperature Range
DD Package ....................................... –65°C to 125°C
MS8 Package..................................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)...................300°C
|V – V |............................................................5.5V
+
IN
REF
|V – V | ...........................................................5.5V
–
IN
REF
Output Short-Circuit Duration.......................... Indefinite
Operating Temperature Range
(Note 7).................................................. –40°C to 125°C
pin conFiguraTion
TOP VIEW
+
NC
–IN
+IN
1
2
3
4
8
7
6
5
V
TOP VIEW
+
OUT
RG
REF
NC
–IN
+IN
1
2
3
4
8 V
9
7 OUT
6 RG
5 REF
–
V
–
V
MS8 PACKAGE
8-LEAD PLASTIC MSOP
DD PACKAGE
8-LEAD (3mm s 3mm) PLASTIC DFN
T
= 150°C, θ = 200°C/W
JA
JMAX
T
= 125°C, θ = 160°C/W
JA
JMAX
–
UNDERSIDE METAL INTERNALLY CONNECTED TO V
(PCB CONNECTION OPTIONAL)
orDer inForMaTion
LEAD FREE FINISH
LTC6800HDD#PBF
LTC6800HMS8#PBF
TAPE AND REEL
PART MARKING*
LAEP
PACKAGE DESCRIPTION
TEMPERATURE RANGE
–40°C to 125°C
LTC6800HDD#TRPBF
LTC6800HMS8#TRPBF
8-Lead (3mm × 3mm) Plastic DFN
LTADE
8-Lead Plastic MSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
6800fb
ꢁ
LTC6800
elecTrical characTerisTics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 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
CONDITIONS
= 200mV
MIN
TYP
MAX
UNITS
Input Offset Voltage (Note 2)
Average Input Offset Drift (Note 2)
V
100
µV
CM
l
l
T = –40°C to 85°C
250
–2.5
nV/°C
µV/°C
A
T = 85°C to 125°C
–1
A
l
Common Mode Rejection Ratio
(Notes 4, 5)
A = 1, V = 0V to 3V
85
113
dB
V
CM
Integrated Input Bias Current (Note 3)
Integrated Input Offset Current (Note 3)
Input Noise Voltage
V
V
= 1.2V
= 1.2V
4
1
10
3
nA
nA
CM
CM
DC to 10Hz
2.5
116
µV
P-P
l
Power Supply Rejection Ratio (Note 6)
Output Voltage Swing High
V = 2.7V to 5.5V
110
dB
S
–
l
l
R = 2k to V
R = 10k to V
2.85
2.95
2.94
2.98
V
V
L
L
–
l
l
Output Voltage Swing Low
Gain Error
20
0.1
100
1.2
mV
%
A = 1
V
Gain Nonlinearity
A = 1
V
ppm
mA
Supply Current
No Load
Internal Op Amp Gain Bandwidth
Slew Rate
200
0.2
3
kHz
V/µs
kHz
Internal Sampling Frequency
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 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
CONDITIONS
= 200mV
MIN
TYP
MAX
UNITS
Input Offset Voltage (Note 2)
Average Input Offset Drift (Note 2)
V
100
µV
CM
l
l
T = –40°C to 85°C
250
–2.5
nV/°C
µV/°C
A
T = 85°C to 125°C
–1
A
l
Common Mode Rejection Ratio
(Notes 4, 5)
A = 1, V = 0V to 5V
85
116
dB
V
CM
Integrated Input Bias Current (Note 3)
Integrated Input Offset Current (Note 3)
Power Supply Rejection Ratio (Note 6)
Output Voltage Swing High
V
V
= 1.2V
= 1.2V
4
1
10
3
nA
nA
dB
CM
CM
l
V = 2.7V to 5.5V
110
116
S
–
l
l
R = 2k to V
R = 10k to V
4.85
4.95
4.94
4.98
V
V
L
L
–
l
l
Output Voltage Swing Low
Gain Error
20
0.1
100
1.3
mV
%
A = 1
V
Gain Nonlinearity
A = 1
V
ppm
mA
Supply Current
No Load
Internal Op Amp Gain Bandwidth
Slew Rate
200
0.2
3
kHz
V/µs
kHz
Internal Sampling Frequency
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: These parameters are guaranteed by design. Thermocouple effects
preclude measurement of these voltage levels in high speed automatic
test systems. V is measured to a limit determined by test equipment
OS
capability.
6800fb
ꢂ
LTC6800
elecTrical characTerisTics
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 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
Note 4: The CMRR with a voltage gain, A , larger than 10 is 120dB (typ).
V
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.
125°C range (denoted by
l) are assured by design and characterization
but are not tested or QA sampled at these temperatures.
Typical perForMance characTerisTics
Input Offset Voltage vs Input
Common Mode Voltage
Input Offset Voltage vs Input
Common Mode Voltage
Input Offset Voltage vs Input
Common Mode Voltage
20
15
15
10
5
15
10
5
V
V
= 3V
REF
V
V
T
= 5V
REF
= 25°C
V
V
T
= 3V
REF
= 25°C
S
S
S
= 0V
= 0V
= 0V
G = 10
A
A
10
G = 1000
5
0
0
0
G = 1000
G = 10
T
= 70°C
A
G = 100
G = 1
–5
G = 100
G = 1
–5
–10
–15
–5
–10
–15
T
= 25°C
T
A
–10
–15
–20
G = 10
= –55°C
1.5
A
0
2
3
4
5
0
0.5
1.0
2.0
2.5
3.0
1
0
1.0
1.5
2.0
2.5
3.0
0.5
INPUT COMMON MODE VOLTAGE (V)
INPUT COMMON MODE VOLTAGE (V)
INPUT COMMON MODE VOLTAGE (V)
6800 G03
2053 G02
6800 G01
Input Offset Voltage vs Input
Common Mode Voltage,
85°C ≤ TA ≤ 125°C
Input Offset Voltage vs Input
Common Mode Voltage,
85°C ≤ TA ≤ 125°C
Input Offset Voltage vs Input
Common Mode Voltage
20
60
40
60
40
V
V
= 5V
REF
V
V
= 3V
REF
V
V
= 5V
S
= 0V
REF
S
S
= 0V
= 0V
15
10
G = 10
G = 10
G = 10
20
20
5
0
0
0
T
= 85°C
A
T
= 85°C
T
= 70°C
A
A
–5
–20
–40
–60
–20
–40
–60
T
= 25°C
A
–10
–15
–20
T
= 125°C
A
T
= 125°C
2
A
T
= –55°C
4
A
0
1.0
1.5
2.0
2.5
3.0
0
2
3
5
0.5
0
3
4
5
1
1
INPUT COMMON MODE VOLTAGE (V)
INPUT COMMON MODE VOLTAGE (V)
INPUT COMMON MODE VOLTAGE (V)
6800 G04
6800 G05
6800 G06
6800fb
ꢃ
LTC6800
Typical perForMance characTerisTics
Additional Input Offset Due to
Input RS vs Input Common Mode
(CIN < 100pF)
Additional Input Offset Due to
Input RS vs Input Common Mode
(CIN < 100pF)
Additional Input Offset Due to
Input RS Mismatch vs Input
Common Mode (CIN < 100pF)
50
40
30
20
60
40
V
V
C
= 3V
S
V
V
= 5V
V
V
R
C
= 3V
S
S
= 0V
REF
= 0V
= R
R = 20k
S
= 0V
REF
REF
+
–
+
–
= R
+
–
R
–
= 0k, R = 15k
< 100pF
IN
R
C
S
= R = R
IN
IN
S
30
G = 10
= 25°C
< 100pF
< 100pF
IN
IN
T
G = 10
G = 10
= 25°C
A
20
+
R
= 0k, R = 10k
–
R
= 15k
10
20
S
T
= 25°C
T
A
R
S
= 5k
A
+
10
R
+
= 0k, R = 5k
R
S
= 10k
R
S
= 0k
0
0
0
R
S
= 5k
–
–10
–20
–30
–40
–50
R
S
= 10k
R
+
= 5k, R = 0k
= 10k, R = 0k
+
–
–10
–20
–30
R
–20
–40
–60
R
= 15k
R
R
R
S
S
S
+
–
+
–
+
–
SMALL C
R
S
= 20k
SMALL C
R
SMALL C
R
IN
IN
IN
–
+
–
R
R
= 15k, R = 0k
2.0 2.5
S
S
0
1.0
1.5
3.0
0.5
0
2
3
4
5
0
1.0
1.5
2.0
2.5
3.0
1
0.5
INPUT COMMON MODE VOLTAGE (V)
INPUT COMMON MODE VOLTAGE (V)
INPUT COMMON MODE VOLTAGE (V)
6800 G09
6800 G08
6800 G07
Additional Input Offset Due to
Input RS Mismatch vs Input
Common Mode (CIN < 100pF)
Additional Input Offset Due to
Additional Input Offset Due to
Input RS vs Input Common Mode
(CIN > 1µF)
Input RS vs Input Common Mode
(CIN > 1µF)
40
30
40
30
70
50
+
–
V
V
= 3V
V
V
C
= 5V
REF
S
R
= 0k, R = 20k
IN
S
IN
+
= 0V
R
S
= 10k
= 0V
REF
+
–
–
R
= 15k
R
= R = R
S
< 100pF
S
R
= 0k, R = 15k
IN
IN
IN
+
C
> 1µF
IN
G = 10
–
20
20
R
+
= 0k, R = 10k
IN
R
S
= 5k
R
= 10k
S
IN
G = 10
T
= 25°C
30
A
–
T = 25°C
A
R
= 10k, R = 0k
IN
IN
10
10
R
S
= 1k
= 500Ω
R
= 5k
S
10
0
0
R
S
–10
–30
–50
–70
+
–
R
= 15k, R = 0k
IN
IN
–10
–20
–30
–40
–10
–20
–30
–40
V
= 5V
+
–
S
R
IN
= 20k, R = 0k
+
IN
R
S
R
R
V
= 0V
S
REF
+
–
R
C
= R = R
+
–
+
–
+
–
S
BIG C
R
SMALL C
BIG C
R
> 1µF
IN
IN
IN
IN
G = 10
–
T
= 25°C
R
S
A
S
0
2
3
4
5
0
1.0
1.5
2.0
2.5
3.0
1
0.5
0
2
3
4
5
1
INPUT COMMON MODE VOLTAGE (V)
INPUT COMMON MODE VOLTAGE (V)
INPUT COMMON MODE VOLTAGE (V)
6800 G11
6800 G10
6800 G12
Additional Input Offset Due to
Input RS Mismatch vs Input
Common Mode (CIN > 1µF)
Additional Input Offset Due to
Input RS Mismatch vs Input
Common Mode (CIN > 1µF)
Offset Voltage vs Temperature
80
60
200
150
100
50
200
150
100
50
V
V
T
= 5V
V
V
T
= 3V
S
S
= 0V
= 0V
REF
REF
+
–
–
= 25°C
= 25°C
+
–
A
A
R
= 0Ω, R = 1k
R
= 0Ω, R = 1k
G = 10
G = 10
40
+
+
–
R
= 0Ω, R = 500Ω
–
R
= 0Ω, R = 500Ω
+
–
R
= 0Ω, R = 100Ω
20
+
R
= 0Ω, R = 100Ω
0
0
0
+
–
+
–
V
= 3V
S
V = 5V
S
R
= 100Ω, R = 0Ω
R
= 100Ω, R = 0Ω
–50
–20
–40
–60
–80
–50
–100
–150
–200
+
–
+
–
R
= 500Ω, R = 0Ω
R
= 500Ω, R = 0Ω
+
+
R
R
–100
–150
–200
+
–
+
–
+
–
+
–
R
= 1k, R = 0Ω
R
= 1k, R = 0Ω
BIG
C
BIG
C
IN
IN
–
–
R
R
0
1.0
1.5
2.0
2.5
3.0
1
2
4
0.5
0
5
–50 –25
0
25
50
75 100 125
3
INPUT COMMON MODE VOLTAGE (V)
INPUT COMMON MODE VOLTAGE (V)
TEMPERATURE (°C)
6800 G13
6800 G15
6800 G14
6800fb
ꢄ
LTC6800
Typical perForMance characTerisTics
VOS vs VREF
Gain Nonlinearity, G = 10
Gain Nonlinearity, G = 1
10
8
10
8
30
20
+
–
V
= V = REF
V
V
=
S
REF
G = 10
2.ꢀV
= 0V
V
V
=
2.ꢀV
= 0V
IN
IN
S
G = 10
= 25°C
REF
G = 1
= 10k
= 2ꢀ°C
T
A
6
6
R
T
R
T
= 10k
= 2ꢀ°C
L
L
4
4
A
A
10
2
2
0
0
0
V
= 5V
S
–2
–4
–6
–8
–10
–2
–4
–6
–8
–10
V
= 3V
S
–10
–20
–30
–2.4
–0.4
0.6
–2.4
–0.4
0.6 1.1
–1.4
1.6
2.6
0
2
3
4
–1.9 –1.4 –0.9
0.1
1.6
1
OUTPUT VOLTAGE (V)
V
(V)
OUTPUT VOLTAGE (V)
REF
6800 G16
6800 G18
6800 G17
Input Voltage Noise Density
vs Frequency
Input Referred Noise
in 10Hz Bandwidth
CMRR vs Frequency
130
120
110
100
90
300
250
200
150
100
50
3
2
V
V
T
= 3V, 5V
G = 10
S
= 1V
T
= 25°C
IN
P-P
A
= 25°C
A
+
–
R
= R = 1k
1
V
= 5V
= 3V
S
+
–
R
= R = 10k
0
V
S
+
+
–
–
R = 10k, R = 0Ω
R = 0Ω, R = 10k
–1
–2
–3
+
R
+
–
80
–
R
70
0
1
10
100
1000
1
10
100
FREQUENCY (Hz)
1000
10000
–5
–3
–1
1
3
5
FREQUENCY (Hz)
TIME (s)
6800 G19
6800 G20
6800 G21
Output Voltage Swing
vs Output Current
Input Referred Noise
in 10Hz Bandwidth
Supply Current vs Supply Voltage
3
2
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
T
= 25°C
V
= 5V, SOURCING
A
S
T
= 125°C
A
1
V
= 3V, SOURCING
T
= 85°C
S
A
0
–1
–2
–3
T
= 0°C
A
T
= –55°C
A
V
= 3V, SINKING
S
V
= 5V, SINKING
S
–5
–3
–1
1
3
5
5.5
6
2.5
3.5
4.5
0.01
1
10
0.1
TIME (s)
OUTPUT CURRENT (mA)
SUPPLY VOLTAGE (V)
6800 G23
6800 G22
6800 G24
6800fb
ꢅ
LTC6800
Typical perForMance characTerisTics
Low Gain Settling Time
vs Settling Accuracy
Internal Clock Frequency
vs Supply Voltage
Settling Time vs Gain
35
30
25
20
15
10
5
8
7
6
5
4
3
2
1
0
3.40
3.35
3.30
3.25
3.20
3.15
3.10
V
= 5V
OUT
V
= 5V
OUT
S
S
dV
dV
= 1V
= 1V
0.1% ACCURACY
= 25°C
G < 100
= 25°C
T
T
A
A
T
= 125°C
A
T
= 85°C
A
T
= 25°C
A
T
= –55°C
A
0
0.01
SETTLING ACCURACY (%)
0.0001
0.001
0.1
1
10
100
GAIN (V/V)
1000
10000
2.5
3.5
4.5
5.5
6
SUPPLY VOLTAGE (V)
6800 G26
6800 G25
6800 G27
pin FuncTions
NC (Pin 1): Not Connected.
–IN (Pin 2): Inverting Input.
+IN (Pin 3): Noninverting Input.
RG (Pin 6): Inverting Input of Internal Op Amp. See
Figure 1.
OUT (Pin 7): Amplifier Output. See Figure 1.
+
V (Pin 8): Positive Supply.
–
V (Pin 4): Negative Supply.
REF (Pin 5): Voltage Reference (V ) for Amplifier
REF
Output.
6800fb
ꢆ
LTC6800
block DiagraM
8
+
V
+IN
–IN
3
2
+
–
OUT
C
C
7
S
H
–
REF
RG
V
5
6
4
6800 BD
applicaTions inForMaTion
Theory of Operation
Where V and V are the voltages of the +IN and –IN
+
–
IN IN
pins, respectively, V
is the voltage at the REF pin and
REF
The LTC6800 uses an internal capacitor (C ) to sample
S
+
V is the positive supply voltage.
a differential input signal riding on a DC common mode
voltage(seetheBlockDiagram). Thiscapacitor’schargeis
For example, with a 3V single supply and a 0V to 100mV
transferred to a second internal hold capacitor (C ) trans-
differential input voltage, V
1.6V.
must be between 0V and
H
REF
lating the common mode of the input differential signal to
that of the REF pin. The resulting signal is amplified by a
zero-drift op amp in the noninverting configuration. The
RG pin is the negative input of this op amp and allows
external programmability of the DC gain. Simple filtering
can be realized by using an external capacitor across the
feedback resistor.
Settling Time
The sampling rate is 3kHz and the input sampling period
during which C is charged to the input differential voltage
S
V
is approximately 150µs. First assume that on each
IN
input sampling period, C is charged fully to V . Since
S
IN
C = C (= 1000pF), a change in the input will settle to
S
H
Input Voltage Range
N bits of accuracy at the op amp noninverting input after
N clock cycles or 333µs(N). The settling time at the OUT
pin is also affected by the settling of the internal op amp.
Sincethegainbandwidthoftheinternalopampistypically
200kHz, the settling time is dominated by the switched
capacitor front end for gains below 100 (see the Typical
Performance Characteristics section).
The input common mode voltage range of the LTC6800
is rail-to-rail. However, the following equation limits the
size of the differential input voltage:
–
+
V ≤ (V – V ) + V ≤ V – 1.3
+
–
IN
IN
REF
6800fb
ꢇ
LTC6800
applicaTions inForMaTion
UNITY GAIN
UNITY GAIN
NONUNITY GAIN
NONUNITY GAIN
5V
5V
8
5V
8
5V
8
8
3
2
3
2
3
2
3
2
V
V
+
V
V
+
V
V
+
V
V
+
+IN
–IN
+IN
–IN
+IN
–IN
+IN
–IN
+
+
+
+
7
7
7
7
V
V
V
V
OUT
V
V
V
V
IN
OUT
OUT
OUT
IN
IN
IN
6
6
6
6
R2
R2
–
–
–
–
–
–
–
–
5
5
5
5
4
4
4
4
R1
R1
V
V
REF
REF
V
REF
0V < V < 5V
0V < V < 5V AND |V – V | < 5.5V
0V < V < 5V AND |V – V | < 5.5V
0V < V < 5V AND |V – V | < 5.5V
–IN –IN REF
+IN
–IN
–IN
REF
–IN
–IN
REF
0V < V < 5V
0V < V < 5V AND |V – V | < 5.5V
0V < V < 5V AND |V – V | < 5.5V
0V < V < 5V AND |V – V | < 5.5V
–IN
+IN
+IN
REF
+IN
+IN
REF
+IN +IN REF
0V < V < 3.7V
0V < V + V
< 3.7V
0V < V + V
< 3.7V
0V < V + V
< 3.7V
IN
IN
REF
IN
REF
R2
IN
REF
R2
V
= V
OUT
IN
V
= V + V
IN
V
= 1 +
V
+ V
V
= 1 +
(V + V
)
REF
OUT
REF
OUT
IN
REF
OUT
IN
6800 F01
R1
R1
Figure 1
Input Current
Whenever the differential input V changes, C must be
In the Typical Performance Characteristics section of this
data sheet, there are curves showing the additional error
from nonzero source resistance in the inputs. If there are
no large capacitors across the inputs, the amplifier is
less sensitive to source resistance and source resistance
mismatch. When large capacitors are placed across the
inputs, the input charging currents previously described
result in larger DC errors, especially with source resistor
mismatches.
IN
H
charged up to the new input voltage via C . This results
S
in an input charging current during each input sampling
period. Eventually, C and C will reach V and, ideally,
H
S
IN
the input current would go to zero for DC inputs.
In reality, there are additional parasitic capacitors which
disturb the charge on C every cycle even if V is a DC
S
IN
voltage. For example, the parasitic bottom plate capacitor
on C must be charged from the voltage on the REF pin
Power Supply Bypassing
S
to the voltage on the –IN pin every cycle. The resulting
input charging current decays exponentially during each
TheLTC6800usesasampleddatatechniqueand,therefore,
contains some clocked digital circuitry. It is, therefore,
sensitive to supply bypassing. A 0.1µF ceramic capacitor
must be connected between Pin 8 (V ) and Pin 4 (V ) with
leads as short as possible.
input sampling period with a time constant equal to R C .
S S
If the voltage disturbance due to these currents settles
before the end of the sampling period, there will be no
errors due to source resistance or the source resistance
+
–
mismatch between –IN and +IN. With R less than 10k,
S
no DC errors occur due to this input current.
6800fb
ꢈ
LTC6800
Typical applicaTions
Precision ÷2
5V
0.1µF
3
2
8
V
+
IN
7
LTC6800
V
OUT
6
–
5
4
V
2
IN
1k
V
=
OUT
0.1µF
6800 TA03
Precision Doubler (General Purpose)
2.5V
0.1µF
3
8
5
V
+
IN
7
LTC6800
V
OUT
2
6
–
4
V
= 2V
IN
OUT
0.1µF
0.1µF
6800 TA04
–2.5V
Precision Inversion (General Purpose)
2.5V
0.1µF
3
8
+
7
LTC6800
V
OUT
2
6
–
V
5
IN
4
V
= –V
IN
OUT
0.1µF
6800 TA05
–2.5V
6800fb
ꢀ0
LTC6800
package DescripTion
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698 Rev C)
0.70 p0.05
3.5 p0.05
2.10 p0.05 (2 SIDES)
1.65 p0.05
PACKAGE
OUTLINE
0.25 p 0.05
0.50
BSC
2.38 p0.05
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
R = 0.125
0.40 p 0.10
TYP
5
8
3.00 p0.10
(4 SIDES)
1.65 p 0.10
(2 SIDES)
PIN 1
TOP MARK
(NOTE 6)
(DD8) DFN 0509 REV C
4
1
0.25 p 0.05
0.75 p0.05
0.200 REF
0.50 BSC
2.38 p0.10
BOTTOM VIEW—EXPOSED PAD
0.00 – 0.05
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
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 TOP AND BOTTOM OF PACKAGE
6800fb
ꢀꢀ
LTC6800
package DescripTion
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660 Rev F)
3.00 p 0.102
(.118 p .004)
(NOTE 3)
0.52
(.0205)
REF
8
7 6 5
3.00 p 0.102
(.118 p .004)
(NOTE 4)
4.90 p 0.152
(.193 p .006)
0.889 p 0.127
(.035 p .005)
DETAIL “A”
0.254
(.010)
0o – 6o TYP
GAUGE PLANE
5.23
(.206)
MIN
1
2
3
4
3.20 – 3.45
(.126 – .136)
0.53 p 0.152
(.021 p .006)
1.10
(.043)
MAX
0.86
(.034)
REF
DETAIL “A”
0.18
(.007)
0.65
(.0256)
BSC
0.42 p 0.038
(.0165 p .0015)
SEATING
PLANE
TYP
0.22 – 0.38
0.1016 p 0.0508
RECOMMENDED SOLDER PAD LAYOUT
(.009 – .015)
(.004 p .002)
0.65
(.0256)
BSC
TYP
NOTE:
MSOP (MS8) 0307 REV F
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
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
6800fb
ꢀꢁ
LTC6800
revision hisTory (Revision history begins at Rev B)
REV
DATE
DESCRIPTION
PAGE NUMBER
B
7/10
Corrected text in the Absolute Maximum Ratings section
Updated Pin 6 and Pin 7 text in the Pin Functions section
Replaced Figure 1
2
7
9
6800fb
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
ꢀꢂ
LTC6800
Typical applicaTion
Differential Bridge Amplifier
3V
0.1µF
R < 10k
8
2
–
7
OUT
LTC6800
3
6
+
R2 10k
5
4
0.1µF
R1
10Ω
R2
R1
GAIN = 1 +
6800 TA06
relaTeD parTs
PART NUMBER
DESCRIPTION
COMMENTS
LTC1100
Precision Zero-Drift Instrumentation Amplifier
Fixed Gains of 10 or 100, 10µV Offset, 50pA Input Bias Current
LT®1101
Precision, Micropower, Single Supply Instrumentation
Amplifier
Fixed Gains of 10 or 100, I < 105µA
S
LT1167
Single Resistor, Gain-Programmable, Precision
Instrumentation Amplifier
Single-Gain Set Resistor: G = 1 to 10,000, Low Noise: 7.5nV√Hz
LT1168
Low Power, Single Resistor, Gain-Programmable,
Precision Instrumentation Amplifier
I
= 530µA
SUPPLY
LTC1043
LT1789-1
Dual Precision Instrumentation Switched-Capacitor
Building Block
Rail-to-Rail Input, 120dB CMRR
I = 80µA Maximum
SUPPLY
Single Supply, Rail-to-Rail Output, Micropower
Instrumentation Amplifier
LTC2050
LTC2051
LTC2052
LTC2053
Zero-Drift Operational Amplifier
SOT-23 Package, 3µV Max V , 30nV/°C Max Drift
OS
Dual Zero-Drift Operational Amplifier
Quad Zero-Drift Operational Amplifier
MS8 Package, 3µV Max V , 30nV/°C Max Drift
OS
GN-16 Package, 3µV Max V , 30nV/°C Max Drift
OS
Single Supply, Zero-Drift, Rail-to-Rail Input and Output
Instrumentation Amplifier
MS8 Package, 10µV Max V , 50nV/°C Max Drift
OS
6800fb
LT 0710 REV B • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
ꢀꢃ
●
●
LINEAR TECHNOLOGY CORPORATION 2002
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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