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LT1789CS8-10 Schematic ( PDF Datasheet ) - Linear Technology

Teilenummer LT1789CS8-10
Beschreibung (LT1789-1/-10) Single Supply Rail-to-Rail Output Instrumentation Amplifiers
Hersteller Linear Technology
Logo Linear Technology Logo 




Gesamt 24 Seiten
LT1789CS8-10 Datasheet, Funktion
LT1789-1/LT1789-10
Micropower,
Single Supply Rail-to-Rail
Output Instrumentation Amplifiers
FEATURES
s Micropower: 95µA Supply Current Max
s Low Input Offset Voltage: 100µV Max
s Low Input Offset Voltage Drift: 0.5µV/°C Max
s Single Gain Set Resistor:
G = 1 to 1000 (LT1789-1)
G = 10 to 1000 (LT1789-10)
s Inputs Common Mode to V
s Wide Supply Range: 2.2V to 36V Total Supply
s CMRR at G = 10: 96dB Min
s Gain Error: G = 10, 0.25% Max
s Gain Nonlinearity: G = 10, 40ppm Max
s Input Bias Current: 40nA Max
s PSRR at G = 10: 100dB Min
s 1kHz Voltage Noise: 48nV/Hz
Us 0.1Hz to 10Hz Noise: 1.5µVP-P
APPLICATIO S
s Portable Instrumentation
s Bridge Amplifiers
s Strain Gauge Amplifiers
s Thermocouple Amplifiers
s Differential to Single-Ended Converters
s Medical Instrumentation
DESCRIPTIO
The LT®1789-1/LT1789-10 are micropower, precision in-
strumentation amplifiers that are optimized for single supply
operation from 2.2V to 36V. The quiescent current is 95µA
max, the inputs common mode to ground and the output
swings within 110mV of ground. The gain is set with a single
external resistor for a gain range of 1 to 1000 for the LT1789-
1 and 10 to 1000 for the LT1789-10.
The high accuracy of the LT1789-1 (40ppm maximum
nonlinearity and 0.25% max gain error) is unmatched by
other micropower instrumentation amplifiers. The LT1789-10
maximizes both the input common mode range and dynamic
output range when an amplification of 10 or greater is
required, allowing precise signal processing where other
instrumentation amplifiers fail to operate. The LT1789-1/
LT1789-10 are laser trimmed for very low input offset
voltage, low input offset voltage drift, high CMRR and high
PSRR. The output can handle capacitive loads up to 400pF
(LT1789-1), 1000pF (LT1789-10) in any gain configuration
while the inputs are ESD protected up to 10kV (human body).
The LT1789-1/LT1789-10 are offered in the 8-pin SO pack-
age, requiring significantly less PC board area than discrete
multi op amp and resistor designs.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
0.5A to 4A Voltage Controlled Current Source
C1
4700pF
VS
R1
90.9k
VIN
R2
10k
VS
27
6
LT1636
3+ 5
4
R4
10k 6
VS = 3.3V TO 32V
ILOAD
=
VIN
RSENSE
10
= 1A PER VOLT AS SHOWN
RISE TIME 250µs, 10% TO 90%,
1A TO 2A OUTPUT STEP INTO 0.25LOAD
C2
3300pF
C3
0.1µF
R3
100
8k 120
TIP127*
VS
7 +3
8
LT1789-1
REF
1
5 42
* ENSURE ADEQUATE POWER
DISSIPATION CAPABILITY AT
HIGHER VOLTAGES,
3 CURRENTS AND DUTY CYCLES
1
RSENSE*
2 0.1ILOAD
4
RLOAD*
1789 TA01
1789f
1






LT1789CS8-10 Datasheet, Funktion
LT1789-1/LT1789-10
ELECTRICAL CHARACTERISTICS
VS = ±15V, RL = 20k, VCM = VOUT = 0V, TA = 25°C, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
LT1789-1
MIN TYP MAX
G Gain Range
Gain Error
LT1789-1, G = 1 + (200k/RG)
LT1789-10, G = 10 • [1 + (200k/RG)]
VO = ±10V
G=1
G = 10 (Note 2)
G = 100 (Note 2)
G = 1000 (Note 2)
1 1000
0.01 0.10
0.04 0.15
0.04 0.15
0.07 0.20
Gain Nonlinearity
VO = ±10V
G=1
G = 10
G = 100
G = 1000
8 20
1 10
6 20
20 100
VOST Total Input Referred Offset Voltage VOST = VOSI + VOSO/G
VOSI Input Offset Voltage
G = 1000
VOSO Output Offset Voltage
G = 1 (LT1789-1), G = 10 (LT1789-10)
IOS Input Offset Current
IB Input Bias Current
en Input Noise Voltage, RTI
fO = 0.1Hz to 10Hz
G=1
G = 10
G = 100, 1000
30 235
200 1
0.2 4
17 40
5.0
1.5
1.0
Total RTI Noise = eni2 + (eno/G)2
eni Input Noise Voltage Density, RTI fO = 1kHz
eno Output Noise Voltage Density, RTI fO = 1kHz
in Input Noise Current
fO = 0.1Hz to 10Hz
Input Noise Current Density
fO = 1kHz
RIN Input Resistance
CIN Input Capacitance
Differential
Common Mode
49 90
330
19
100
2 4.7
20
17
VCM
CMRR
Input Voltage Range
Common Mode Rejection Ratio
1k Source Imbalance, VCM = –15V to 14V
G=1
G = 10
G = 100, 1000
– 15
80
98
102
89
108
117
14
PSRR Power Supply Rejection Ratio
LT1789-1, VS = ±1.25V to ±16V
LT1789-10, VS = ±1.50V to ±16V
G=1
G = 10
G = 100, 1000
94 107
104 118
106 121
Minimum Supply Voltage
±1.25
IS Supply Current
VO Output Voltage Swing
ISC Short-Circuit Current
Short to – VS
Short to + VS
±14.5
85
±14.7
2.2
8.5
130
LT1789-10
MIN TYP MAX
10 1000
0.01 0.15
0.03 0.20
0.03 0.25
5 40
5 40
25 160
30 295
0.6 3.3
0.2 4
17 40
4.6
1.1
53
270
19
62
2 4.7
20
17
– 15
95
14
93 108
102 123
100
106
±14.5
115
129
85
±14.7
2.2
8.5
±1.50
130
UNITS
%
%
%
%
ppm
ppm
ppm
ppm
µV
mV
nA
nA
µVP-P
µVP-P
µVP-P
nV/Hz
nV/Hz
pAP-P
pA/Hz
G
pF
pF
V
dB
dB
dB
dB
dB
dB
V
µA
V
mA
mA
1789f
6

6 Page









LT1789CS8-10 pdf, datenblatt
LT1789-1/LT1789-10
TYPICAL PERFOR A CE CHARACTERISTICS (LT1789-10)
Output Voltage Swing
vs Load Current
5.0
4.8
125°C
4.6
SOURCE
4.4
–55°C
25°C
1.6
1.4
4.2
4.0
VS = 5V, 0V
VREF = 2.5V
125°C
25°C
1.2
1.0
0.8
0.6
SINK
0.4
–55°C 0.2
0.001
0.01 0.1
1
OUTPUT CURRENT (mA)
0
10
1789 G21
Common Mode Rejection Ratio
vs Frequency
120
G = 100, 1000
VS = 5V, 0V
110 VREF = 2.5V
100 G = 10
90
80
70
60
50
40
10
100 1k
FREQUENCY (Hz)
10k 20k
1789 G24
Output Impedance vs Frequency
10k
VS = 5V, 0V
VREF = 2.5V
1k
100
10
1
100
1k 10k
FREQUENCY (Hz)
100k
1789 G27
Gain vs Frequency
80
70
G = 1000
60
VS = 5V, 0V
VREF = 2.5V
50
G = 100
40
30
G = 10
20
10
0
–10
–20
100
1k 10k
FREQUENCY (Hz)
100k
1789 G22
Slew Rate vs Temperature
0.12
0.11
RISING
0.10
0.09
0.08
FALLING
0.07
0.06
0.05
0.04
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1789 G23
Negative Power Supply Rejection
Ratio vs Frequency
140
VS = 5V, 0V
120
G = 1000
VREF = 2.5V
INPUT REFERRED
100 G = 100
80
G = 10
60
Positive Power Supply Rejection
Ratio vs Frequency
140
G = 100, 1000
120
G = 10
VS = 5V, 0V
VREF = 2.5V
INPUT REFERRED
100
80
60
40 40
20 20
0
10 100
1k 10k 20k
FREQUENCY (Hz)
1789 G25
0
10 100
1k 10k 20k
FREQUENCY (Hz)
1789 G26
Overshoot vs Capacitive Load
100
VS = 5V, 0V
90 VREF = 2.5V
80 VOUT = 100mVP-P
70
60
50
40
30
20
10
0
10
G = 1000
G = 100
G = 10
100
CAPACITIVE LOAD (pF)
1000
1789 G28
Settling Time to 0.01% vs
Output Step
10
VS = ±15V
8 RL = 20k
G = 10
6
4
2
0
–2
–4
–6
–8
–10
0
100 200 300 400
SETTLING TIME (µs)
500
1789 G29
12
1789f

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