LT1884/LT1885
Dual/Quad Rail-to-Rail
Output, Picoamp Input
Precision Op Amps
FEATURES
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Offset Voltage: 50µV Max (LT1884A)
Input Bias Current: 400pA Max (LT1884A)
Offset Voltage Drift: 0.8µV/°C Max
Rail-to-Rail Output Swing
Operates with Single or Split Supplies
Open-Loop Voltage Gain: 1 Million Min
1mA Maximum Supply Current Per Amplifier
Slew Rate: 1V/µs
Standard Pinouts
The LT
®
1884/LT1885 op amps bring high accuracy input
performance to amplifiers with rail-to-rail output swing
while providing faster response than other precision am-
plifiers. Input offset voltage is trimmed to less than 50µV
and the low drift maintains this accuracy over the operat-
ing temperature range. Input bias currents are an ultralow
400pA maximum.
The amplifiers work on any total power supply voltage
between 2.7V and 36V (fully specified from 5V to
±15V).
Output voltage swings to within 40mV of the negative
supply and 220mV of the positive supply make these
amplifiers good choices for low voltage single supply
operation.
Slew rates of 1V/µs with a supply current of less than 1mA
per amplifier give superior response and settling time
performance in a low power precision amplifier.
The dual LT1884 is available with standard pinouts in
8-pin SO and PDIP packages. The quad LT1885 is also in
the standard pinout 14-pin SO package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
s
s
Thermocouple Amplifiers
Bridge Transducer Conditioners
Instrumentation Amplifiers
Battery-Powered Systems
Photo Current Amplifiers
Precision Integrators
Precision Current Sources
TYPICAL APPLICATIO
–IN
Input Fault Protected Instrumentation Amplifier
1M
10pF
3
+
1/4 LT1885
10k
10k
–
R
G/2
10k
–
1/4 LT1885
OUT
+
GUARD
1/4 LT1885
R
G/2
10k
+
GAIN =
10k
9.76k
500Ω
TRIM FIRST
FOR DC CMRR
1884 TA01
–
–
1M
+IN
22pF
TRIM FOR
AC CMRR
1/4 LT1885
5
+
U
2•10k
R
G
U
U
1
LT1884/LT1885
ABSOLUTE
AXI U
RATI GS
Supply Voltage (V
+
to V
–
) ....................................... 40V
Differential Input Voltage (Note 2) .........................
±10V
Input Voltage .................................................... V
+
to V
–
Input Current (Note 2) ........................................
±10mA
Output Short-Circuit Duration (Note 3) ............ Indefinite
PACKAGE/ORDER I FOR ATIO
ORDER
PART NUMBER
TOP VIEW
OUT A 1
–IN A 2
A
+IN A 3
V
–
4
N8 PACKAGE
8-LEAD PDIP
B
6
5
–IN B
+IN B
8
7
V
+
OUT B
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 130°C/W (N8)
T
JMAX
= 150°C,
θ
JA
= 190°C/W (S8)
LT1884CN8
LT1884CS8
LT1884ACN8
LT1884ACS8
LT1884IN8
LT1884IS8
LT1884AIN8
LT1884AIS8
S8 PART MARKING
1884
1884A
1884I
1884AI
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
The
q
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
Single supply operation V
EE
= 0, V
CC
= 5V; V
CM
= V
CC
/2 unless otherwise noted. (Note 5)
SYMBOL
V
OS
PARAMETER
Input Offset Voltage (LT1884A)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
Input Offset Voltage (LT1884/LT1885)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
Input Offset Voltage Drift (Note 6)
I
OS
Input Offset Current (LT1884A)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
Input Offset Current (LT1884/LT1885)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
q
q
q
q
q
q
q
q
q
q
CONDITIONS
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
2
U
U
W
W W
U
W
(Note 1)
Operating Temperature Range (Note 4) .. – 40°C to 85°C
Specified Temperature Range (Note 5) ... – 40°C to 85°C
Maximum Junction Temperature .......................... 150°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER
PART NUMBER
TOP VIEW
OUT A 1
– IN A 2
+IN A 3
V
+
14
OUT D
A
13
–IN D
LT1885CS
LT1885IS
D
12
+IN D
11
V
–
4
+IN B
5
–IN B
6
OUT B
7
B
C
10
+IN C
9
8
–IN C
OUT C
S PACKAGE
14-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 110°C/W
MIN
TYP
25
MAX
50
85
110
80
125
150
0.8
0.8
300
400
500
900
1200
1400
UNITS
µV
µV
µV
µV
µV
µV
µV/°C
µV/°C
pA
pA
pA
pA
pA
pA
30
0.3
0.3
100
150
LT1884/LT1885
The
q
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
Single supply operation V
EE
= 0, V
CC
= 5V; V
CM
= V
CC
/2 unless otherwise noted. (Note 5)
SYMBOL
I
B
PARAMETER
Input Bias Current (LT1884A)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
Input Bias Current (LT1884/LT1885)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
Input Noise Voltage
e
n
i
n
V
CM
CMRR
PSRR
A
VOL
Input Noise Voltage Density
Input Noise Current Density
Input Voltage Range
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
TYP
100
MAX
400
500
600
900
1200
1400
UNITS
pA
pA
pA
pA
pA
pA
µV
P-P
nV/√Hz
pA/√Hz
150
0.1Hz to 10Hz
f = 1kHz
f = 1kHz
V
EE
+ 1.0
V
EE
+ 1.2
108
106
108
500
350
400
300
300
200
0.4
9.5
0.05
V
CC
– 1.0
V
CC
– 1.2
128
132
2.4
1600
800
400
20
25
70
270
120
130
180
360
0.45
q
V
V
dB
dB
dB
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Large-Signal Voltage Gain
1V < V
CM
< 4V
1.2V < V
CM
< 3.8V
V
EE
= 0, V
CM
= 1.5V; 2.7V < V
CC
< 32V
R
L
= 10k; 1V < V
OUT
< 4V
q
q
q
q
2.7
V
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
R
L
= 2k; 1V < V
OUT
< 4V
q
R
L
= 1k; 1V < V
OUT
< 4V
q
V
OL
Output Voltage Swing Low
No Load
I
SINK
= 100µA
I
SINK
= 1mA
I
SINK
= 5mA
No Load
I
SOURCE
= 100µA
I
SOURCE
= 1mA
I
SOURCE
= 5mA
V
CC
= 3V
V
CC
= 5V
q
q
q
q
q
q
q
q
40
50
150
600
220
230
300
600
0.85
1.30
0.9
1.4
1.0
1.5
mV
mV
mV
mV
mV
mV
mV
mV
mA
mA
mA
mA
mA
mA
mA
mA
MHz
µs
V/µs
V/µs
V/µs
V/µs
V
OH
Output Voltage Swing High
(Referred to V
CC
)
I
S
Supply Current per Amplifier
0.65
0.65
0.70
30
30
2
10
0.50
q
V
CC
= 12V
q
0.50
q
q
I
SC
GBW
t
S
SR
+
SR
–
Short-Circuit Current
Gain-Bandwidth Product
Settling Time
Positive Slew Rate
Negative Slew Rate
V
OUT
Short to GND
V
OUT
Short to V
CC
f = 20kHz
0.01%, V
OUT
= 1.5V to 3.5V,
A
V
= –1, R
L
= 2k
A
V
= – 1
15
15
1.2
q
0.45
0.36
0.35
0.25
0.9
0.7
A
V
= – 1
q
3
LT1884/LT1885
The
q
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
Single supply operation V
EE
= 0, V
CC
= 5V; V
CM
= V
CC
/2 unless otherwise noted. (Note 5)
SYMBOL
∆V
OS
PARAMETER
Offset Voltage Match (LT1884A)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
Offset Voltage Match (LT1884/LT1885)
(Note 7)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
(Notes 6, 7)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
(Notes 7, 9)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
(Notes 7, 9)
V
EE
= 0V, V
CM
= 1.5V, 2.7V < V
CC
< 32V,
(Notes 7, 9)
q
q
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
TYP
30
MAX
70
125
160
125
195
235
1.2
600
700
850
1200
1600
1900
UNITS
µV
µV
µV
µV
µV
µV
µV/°C
pA
pA
pA
pA
pA
pA
dB
dB
35
q
q
q
q
q
Offset Voltage Match Drift
∆I
B
+
Noninverting Bias Current Match
(LT1884A)
Noninverting Bias Current Match
(LT1884/LT1885)
∆CMRR
∆PSRR
Common Mode Rejection Match
Positive Power Supply Rejection Match
0.4
200
250
q
q
q
q
104
104
125
126
The
q
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
Split supply operation V
S
=
±15V;
V
CM
= 0V unless otherwise noted. (Note 5)
SYMBOL
V
OS
PARAMETER
Input Offset Voltage (LT1884A)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
Input Offset Voltage (LT1884/LT1885)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
Input Offset Voltage Drift (Note 6)
I
OS
Input Offset Current (LT1884A)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
Input Offset Current (LT1884/LT1885)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
I
B
Input Bias Current (LT1884A)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
Input Bias Current (LT1884/LT1885)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
Input Noise Voltage
e
n
i
n
V
CM
CMRR
Input Noise Voltage Density
Input Noise Current Density
Input Voltage Range
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
CONDITIONS
MIN
TYP
25
MAX
50
85
110
80
125
150
0.8
0.8
300
400
500
900
1200
1400
400
500
600
900
1200
1400
UNITS
µV
µV
µV
µV
µV
µV
µV/°C
µV/°C
pA
pA
pA
pA
pA
pA
pA
pA
pA
pA
pA
pA
µV
P-P
nV/√Hz
pA/√Hz
30
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
0.3
0.3
150
150
150
150
0.1Hz to 10Hz
f = 1kHz
f = 1kHz
V
EE
+ 1.0
V
EE
+ 1.2
114
0.4
9.5
0.05
V
CC
– 1.0
V
CC
– 1.2
130
V
V
dB
Common Mode Rejection Ratio
–13.5V < V
CM
< 13.5V
q
4
LT1884/LT1885
ELECTRICAL CHARACTERISTICS
The
q
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
Split supply operation V
S
=
±15V;
V
CM
= 0V unless otherwise noted. (Note 5)
SYMBOL
+ PSRR
– PSRR
A
VOL
PARAMETER
Positive Power Supply Rejection Ratio
Negative Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Large-Signal Voltage Gain
R
L
= 10k; –13.5V < V
OUT
< 13.5V
q
CONDITIONS
V
EE
= –15V, V
CM
= 0V; 1.5V < V
CC
< 18V
V
CC
= 15V, V
CM
= 0V; –1.5V < V
EE
< –18V
q
q
q
MIN
114
106
1000
700
250
175
100
75
TYP
132
132
±1.2
1600
420
230
20
25
70
270
160
160
180
360
0.85
MAX
UNITS
dB
dB
±1.35
V
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
R
L
= 2k; –13.5V < V
OUT
< 13.5V
q
R
L
= 1k; –12V < V
OUT
< 12V
q
V
OL
Output Voltage Swing Low
(Referred to V
EE
)
No Load
I
SINK
= 100µA
I
SINK
= 1mA
I
SINK
= 5mA
No Load
I
SOURCE
= 100µA
I
SOURCE
= 1mA
I
SOURCE
= 5mA
V
S
=
±15V
q
q
q
q
q
q
q
q
q
40
50
150
600
220
230
300
600
1.1
1.6
mV
mV
mV
mV
mV
mV
mV
mV
mA
mA
mA
mA
MHz
µs
V/µs
V/µs
V/µs
V/µs
V
OH
Output Voltage Swing High
(Referred to V
CC
)
I
S
I
SC
GBW
t
S
SR
+
SR
–
∆V
OS
Supply Current Per Amplifier
Short-Circuit Current
Gain-Bandwidth Product
Settling Time
Positive Slew Rate
Negative Slew Rate
Offset Voltage Match (LT1884A)
V
OUT
Short to V
EE
V
OUT
Short to V
CC
f = 20kHz
0.01%, V
OUT
= – 5V to 5V,
A
V
= –1, R
L
= 2k
A
V
= – 1
q
q
15
15
1.5
50
30
2.2
17
q
0.5
0.4
0.40
0.26
1.0
0.7
35
70
125
160
125
175
235
1.1
600
700
850
1200
1600
1900
A
V
= – 1
q
(Note 7)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
(Note 7)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
(Note 6, 7)
(Notes 7, 8)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
(Notes 7, 8)
0°C < T
A
< 70°C
– 40°C < T
A
< 85°C
(Notes 7, 9)
V
EE
= –15V, V
CM
= 0V, 1.5V < V
CC
< 18V,
(Notes 7, 9)
V
CC
= 15V, V
CM
= 0V, – 1.5V < V
EE
< –18V,
(Notes 7, 9)
q
q
µV
µV
µV
µV
µV
µV
µV/°C
pA
pA
pA
pA
pA
pA
dB
dB
dB
Offset Voltage Match (LT1884/LT1885)
35
q
q
q
q
q
Offset Voltage Match Drift
∆I
B+
Noninverting Bias Current Match
(LT1884A)
Noninverting Bias Current Match
(LT1884/LT1885)
∆CMRR
∆
+PSRR
∆
– PSRR
Common Mode Rejection Match
Positive Power Supply Rejection Match
Negative Power Supply Rejection Match
0.4
200
240
q
q
q
q
q
106
108
102
125
124
132
5
京公网安备 11010802033920号
EEWORLD
