LT1881/LT1882
1
18812fb
TYPICAL APPLICATION
DESCRIPTION
Dual and Quad
Rail-to-Rail Output, Picoamp
Input Precision Op Amps
The LT
®
1881 and LT1882 op amps bring high accuracy
input performance to amplifi ers with rail-to-rail output
swing. Input bias currents and capacitive load driving
capabilities are superior to the similar LT1884 and LT1885
amplifi ers, at the cost of a slight loss in speed. Input
offset voltage is trimmed to less than 50μV and the
low drift maintains this accuracy over the operating
temperature range. Input bias currents are an ultralow
200pA maximum.
The amplifi ers work on any total power supply voltage
between 2.7V and 36V (fully specifi ed from 5V to ±15V).
Output voltage swings to within 40mV of the negative
supply and 220mV of the positive supply make these
amplifi ers good choices for low voltage single supply
operation.
Capacitive loads up to 1000pF can be driven directly in
unity-gain follower applications.
The dual LT1881 and LT1881A are available with standard
pinouts in S8 and PDIP packages. The quad LT1882 is in a
14-pin SO package. For a higher speed device with similar
DC specifi cations, see the LT1884/LT1885.
FEATURES
APPLICATIONS
n
Offset Voltage: 50μV Maximum (LT1881A)
n
Input Bias Current: 200pA Maximum (LT1881A)
n
Offset Voltage Drift: 0.8μV/°C Maximum
n
Rail-to-Rail Output Swing
n
Supply Range: 2.7V to 36V
n
Operates with Single or Split Supplies
n
Open-Loop Voltage Gain: 1 Million Minimum
n
1mA Maximum Supply Current Per Amplifi er
n
Stable at A
V
= 1, C
L
= 1000pF
n
Standard Pinouts
n
Wide Operating Temperature Range:
–55°C to 125°C (LT1882)
n
Thermocouple Amplifi ers
n
Bridge Transducer Conditioners
n
Instrumentation Amplifi ers
n
Battery-Powered Systems
n
Photo Current Amplifi ers
16-Bit Voltage Output DAC on ±5V Supply
TC V
OS
Distribution, Industrial Grade
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.
–5V
5V
33pF
V
OUT
–4.096V
TO 4.096V
LTC
®
1597
DAC
–
+
LT1881
+
–
LT1881
18812 TA01a
–5V
R
COM
R
OFS
REFR1
5V
1.65k
LT1634
4.096V
5V
INPUT OFFSET VOLTAGE DRIFT (μV/°C)
1 –0.8 –0.6 –0.4 –0.2 0 0.2 0.4 0.6 0.8–0.9 –0.7 –0.5 –0.3 –0.1 0.1 0.3 0.5 0.7 0.9 1
PERCENT OF UNITS (%)
18812 TA01b
26
24
22
20
18
16
14
12
10
8
6
4
2
0
V
S
= ±15V
40 N8 (1 LOT)
144 S8 (2 LOTS)
184 TOTAL PARTS