LT1884CS8 [Linear]
Dual/Quad Rail-to-Rail Output, Picoamp Input Precision Op Amps; 双核/四轨至轨输出，皮安输入精密运算放大器
| 型号： | LT1884CS8 |
| 厂家： | 
Linear |
| 描述： | Dual/Quad Rail-to-Rail Output, Picoamp Input Precision Op Amps |
| 文件： | 总12页 (文件大小：182K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1884/LT1885
Dual/Quad Rail-to-Rail
Output, Picoamp Input
Precision Op Amps
U
FEATURES
DESCRIPTIO
■
Offset Voltage: 50µV Max (LT1884A)
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.
■
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 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.
■
U
APPLICATIO S
■
Thermocouple Amplifiers
■
Bridge Transducer Conditioners
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.
■
Instrumentation Amplifiers
■
Battery-Powered Systems
■
Photo Current Amplifiers
■
Precision Integrators
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.
■
Precision Current Sources
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
Input Fault Protected Instrumentation Amplifier
1M
3
+
–IN
10k
10k
10pF
1/4 LT1885
–
10k
10k
R
R
–
G/2
G/2
+
1/4 LT1885
OUT
1/4 LT1885
GUARD
+
–
2•10k
GAIN =
R
–
G
10k
9.76k
1/4 LT1885
1M
5
500Ω
+IN
+
TRIM FIRST
FOR DC CMRR
22pF
TRIM FOR
AC CMRR
1884 TA01
1
LT1884/LT1885
W W U W
ABSOLUTE AXI U RATI GS (Note 1)
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
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
U W
U
PACKAGE/ORDER I FOR ATIO
ORDER
PART NUMBER
ORDER
PART NUMBER
TOP VIEW
LT1884CN8
LT1884CS8
LT1884ACN8
LT1884ACS8
LT1884IN8
LT1884IS8
LT1885CS
LT1885IS
TOP VIEW
OUT A
–IN A
+IN A
1
2
3
4
5
6
7
14
13
12
11
10
9
OUT D
–IN D
+IN D
+
OUT A
–IN A
+IN A
1
2
3
4
8
7
6
5
V
A
B
D
C
OUT B
–IN B
+IN B
A
+
–
V
V
B
–
V
+IN B
–IN B
OUT B
+IN C
–IN C
OUT C
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
LT1884AIN8
LT1884AIS8
8
TJMAX = 150°C, θJA = 130°C/W (N8)
JMAX = 150°C, θJA = 190°C/W (S8)
S PACKAGE
14-LEAD PLASTIC SO
T
S8 PART MARKING
TJMAX = 150°C, θJA = 110°C/W
1884
1884I
1884A 1884AI
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
Single supply operation VEE = 0, VCC = 5V; VCM = VCC/2 unless otherwise noted. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage (LT1884A)
25
50
85
110
µV
µV
µV
OS
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Offset Voltage (LT1884/LT1885)
30
80
125
150
µV
µV
µV
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Offset Voltage Drift (Note 6)
Input Offset Current (LT1884A)
0°C < T < 70°C
●
●
0.3
0.3
0.8
0.8
µV/°C
µV/°C
A
–40°C < T < 85°C
A
I
100
300
400
500
pA
pA
pA
OS
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Offset Current (LT1884/LT1885)
150
900
1200
1400
pA
pA
pA
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
2
LT1884/LT1885
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
Single supply operation VEE = 0, VCC = 5V; VCM = VCC/2 unless otherwise noted. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
Input Bias Current (LT1884A)
100
400
500
600
pA
pA
pA
B
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Bias Current (LT1884/LT1885)
150
900
1200
1400
pA
pA
pA
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Noise Voltage
0.1Hz to 10Hz
f = 1kHz
0.4
9.5
µV
P-P
e
Input Noise Voltage Density
Input Noise Current Density
Input Voltage Range
nV/√Hz
pA/√Hz
n
i
f = 1kHz
0.05
n
V
V
V
+ 1.0
+ 1.2
V
V
– 1.0
– 1.2
V
V
CM
EE
EE
CC
CC
●
CMRR
PSRR
Common Mode Rejection Ratio
1V < V < 4V
108
106
128
dB
dB
CM
1.2V < V < 3.8V
●
●
●
CM
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Large-Signal Voltage Gain
V
= 0, V = 1.5V; 2.7V < V < 32V
108
132
2.4
dB
V
EE
CM
CC
2.7
A
R = 10k; 1V < V < 4V
L OUT
500
350
1600
V/mV
V/mV
VOL
●
●
●
R = 2k; 1V < V
L
< 4V
400
300
800
400
V/mV
V/mV
OUT
OUT
R = 1k; 1V < V
L
< 4V
300
200
V/mV
V/mV
V
V
Output Voltage Swing Low
Output Voltage Swing High
No Load
●
●
●
●
20
25
70
40
50
150
600
mV
mV
mV
mV
OL
OH
I
I
I
= 100µA
= 1mA
= 5mA
SINK
SINK
SINK
270
No Load
●
●
●
●
120
130
180
360
220
230
300
600
mV
mV
mV
mV
(Referred to V
)
I
I
I
= 100µA
= 1mA
= 5mA
CC
SOURCE
SOURCE
SOURCE
I
Supply Current per Amplifier
V
V
V
= 3V
0.45
0.50
0.50
0.65
0.65
0.70
0.85
1.30
mA
mA
S
CC
CC
CC
●
●
●
= 5V
0.9
1.4
mA
mA
= 12V
1.0
1.5
mA
mA
I
Short-Circuit Current
V
V
Short to GND
●
●
15
15
30
30
mA
mA
SC
OUT
OUT
Short to V
CC
GBW
Gain-Bandwidth Product
Settling Time
f = 20kHz
0.01%, V
1.2
2
MHz
t
= 1.5V to 3.5V,
OUT
10
µs
S
A = –1, R = 2k
V
L
+
–
SR
SR
Positive Slew Rate
Negative Slew Rate
A = –1
0.45
0.36
0.9
0.7
V/µs
V/µs
V
●
●
A = –1
V
0.35
0.25
V/µs
V/µs
3
LT1884/LT1885
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
Single supply operation VEE = 0, VCC = 5V; VCM = VCC/2 unless otherwise noted. (Note 5)
SYMBOL
∆V
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Offset Voltage Match (LT1884A)
30
70
125
160
µV
µV
µV
OS
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Offset Voltage Match (LT1884/LT1885)
Offset Voltage Match Drift
(Note 7)
35
125
195
235
µV
µV
µV
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
(Notes 6, 7)
●
0.4
1.2
µV/°C
∆I +
B
Noninverting Bias Current Match
(LT1884A)
200
600
700
850
pA
pA
pA
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Noninverting Bias Current Match
(LT1884/LT1885)
(Notes 7, 9)
250
1200
1600
1900
pA
pA
pA
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
∆CMRR
∆PSRR
Common Mode Rejection Match
(Notes 7, 9)
●
●
104
104
125
126
dB
dB
Positive Power Supply Rejection Match
V
= 0V, V = 1.5V, 2.7V < V < 32V,
EE CM CC
(Notes 7, 9)
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
Split supply operation VS = ±15V; VCM = 0V unless otherwise noted. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage (LT1884A)
25
50
85
110
µV
µV
µV
OS
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Offset Voltage (LT1884/LT1885)
30
80
125
150
µV
µV
µV
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Offset Voltage Drift (Note 6)
Input Offset Current (LT1884A)
0°C < T < 70°C
●
●
0.3
0.3
0.8
0.8
µV/°C
µV/°C
A
–40°C < T < 85°C
A
I
I
150
150
150
150
300
400
500
pA
pA
pA
OS
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Offset Current (LT1884/LT1885)
Input Bias Current (LT1884A)
900
1200
1400
pA
pA
pA
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
400
500
600
pA
pA
pA
B
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Bias Current (LT1884/LT1885)
900
1200
1400
pA
pA
pA
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Input Noise Voltage
0.1Hz to 10Hz
f = 1kHz
0.4
9.5
µV
P-P
e
Input Noise Voltage Density
Input Noise Current Density
Input Voltage Range
nV/√Hz
pA/√Hz
n
i
f = 1kHz
0.05
n
V
V
V
+ 1.0
+ 1.2
V
V
– 1.0
– 1.2
V
V
CM
EE
EE
CC
CC
●
●
CMRR
Common Mode Rejection Ratio
–13.5V < V < 13.5V
114
130
dB
CM
4
LT1884/LT1885
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
Split supply operation VS = ±15V; VCM = 0V unless otherwise noted. (Note 5)
SYMBOL
+PSRR
–PSRR
PARAMETER
CONDITIONS
MIN
114
106
TYP
132
MAX
UNITS
dB
Positive Power Supply Rejection Ratio
Negative Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Large-Signal Voltage Gain
V
V
= –15V, V = 0V; 1.5V < V < 18V
●
●
●
EE
CM
CC
= 15V, V = 0V; –1.5V < V < –18V
132
dB
CC
CM
EE
±1.2
1600
±1.35
V
A
R = 10k; –13.5V < V < 13.5V
L OUT
1000
700
V/mV
V/mV
VOL
●
●
●
R = 2k; –13.5V < V
L
< 13.5V
OUT
250
175
420
230
V/mV
V/mV
R = 1k; –12V < V
L
< 12V
100
75
V/mV
V/mV
OUT
V
V
Output Voltage Swing Low
No Load
●
●
●
●
20
25
70
40
50
150
600
mV
mV
mV
mV
OL
OH
(Referred to V
)
I
I
I
= 100µA
= 1mA
= 5mA
EE
SINK
SINK
SINK
270
Output Voltage Swing High
(Referred to V
No Load
●
●
●
●
160
160
180
360
220
230
300
600
mV
mV
mV
mV
)
I
I
I
= 100µA
= 1mA
= 5mA
CC
SOURCE
SOURCE
SOURCE
I
I
Supply Current Per Amplifier
Short-Circuit Current
V = ±15V
0.85
1.1
1.6
mA
mA
S
S
●
V
V
Short to V
Short to V
●
●
15
15
50
30
mA
mA
SC
OUT
OUT
EE
CC
GBW
Gain-Bandwidth Product
Settling Time
f = 20kHz
0.01%, V
1.5
2.2
17
MHz
t
= –5V to 5V,
OUT
µs
S
A = –1, R = 2k
V
L
+
–
SR
SR
∆V
Positive Slew Rate
A = –1
0.5
0.4
1.0
0.7
35
V/µs
V/µs
V
●
●
Negative Slew Rate
A = –1
V
0.40
0.26
V/µs
V/µs
Offset Voltage Match (LT1884A)
(Note 7)
70
125
160
µV
µV
µV
OS
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Offset Voltage Match (LT1884/LT1885)
(Note 7)
35
125
175
235
µV
µV
µV
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Offset Voltage Match Drift
(Note 6, 7)
●
0.4
1.1
µV/°C
+
∆I
Noninverting Bias Current Match
(LT1884A)
(Notes 7, 8)
200
600
700
850
pA
pA
pA
B
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
Noninverting Bias Current Match
(LT1884/LT1885)
(Notes 7, 8)
240
1200
1600
1900
pA
pA
pA
0°C < T < 70°C
●
●
A
–40°C < T < 85°C
A
∆CMRR
Common Mode Rejection Match
(Notes 7, 9)
●
●
106
108
125
124
dB
dB
∆+PSRR
Positive Power Supply Rejection Match
V
= –15V, V = 0V, 1.5V < V < 18V,
EE CM CC
(Notes 7, 9)
∆–PSRR
Negative Power Supply Rejection Match
V
= 15V, V = 0V, –1.5V < V < –18V,
●
102
132
dB
CC
CM
EE
(Notes 7, 9)
5
LT1884/LT1885
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
Note 6: This parameter is not 100% tested.
of the device may be impaired.
Note 7: Matching parameters are the difference between amplifiers A and
B in the LT1884 and between amplifiers A and D and B and C in the
LT1885.
Note 2: The inputs are protected by back-to-back diodes. If the differential
input voltage exceeds 0.7V, the input current should be limited to less than
10mA.
Note 8: This parameter is the difference between the two noninverting
Note 3: A heat sink may be required to keep the junction temperature
below absolute maximum.
Note 4: The LT1884C/LT1885C and LT1884I/LT1885I are guaranteed
functional over the operating temperature range of –40°C to 85°C.
input bias currents.
Note 9: ∆CMRR and ∆PSRR are defined as follows: CMRR and PSRR are
measured in µV/V on each amplifier. The difference is calculated in µV/V
and then converted to dB.
Note 5: The LT1884C/LT1885C are designed, characterized and expected
to meet specified performance from –40°C to 85°C but are not tested or
QA sampled at these temperatures. LT1884I is guaranteed to meet
specified performance from –40°C to 85°C.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Input Offset Voltage
vs Temperature
Distribution of Offset Voltage Drift
VOUT vs ISINK
500
400
300
200
100
0
24
20
16
12
8
200
150
100
50
V
= ±15V
V
= ±15V
S
TEMPCO: –55°C TO 125°C
S
10 REPRESENTATIVE UNITS
125°C
25°C
0
–50
–100
–150
–200
4
–55°C
0
10µA
100µA
1mA
10mA
–0.9 –0.7 –0.5 –0.3 –0.1 0.1 0.3 0.5 0.7 0.9
OFFSET VOLTAGE DRIFT (µV/°C)
18845 G01
–50 –30 –10 10 30 50 70 90 110125
I
SINK
TEMPERATURE (°C)
18845 G03
18845 G02
VOUT vs ISOURCE
Gain vs Frequency
Gain, Phase Shift vs Frequency
500
400
300
200
100
0
140
120
100
80
100
90
80
70
60
50
40
30
20
10
0
–80
V
= ±15V
S
V = ±15V
S
–90
PHASE SHIFT
–100
–110
–120
–130
–140
–150
–160
–170
–180
125°C
25°C
60
40
–55°C
GAIN
20
0
–10
–20
–20
10µA
100µA
1mA
SOURCE
10mA
0.1
1
10 100 1k 10k 100k 1M 10M
10k
100k
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
I
18845 G05
18845 G06
18845 G04
6
LT1884/LT1885
U W
TYPICAL PERFOR A CE CHARACTERISTICS
CMRR vs Frequency
PSRR vs Frequency
Vn, In vs Frequency
1000
100
10
140
130
120
110
100
90
80
70
60
50
140
130
120
110
100
90
80
70
60
50
V
= ±15V
S
CURRENT NOISE
VOLTAGE NOISE
NEGATIVE SUPPLY
POSITIVE SUPPLY
40
40
30
30
20
20
10
0
10
0
1
1
10
100
1000
10
100
10k
10
100
10k
1
100k 1M
1
100k 1M
1k
1k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
18845 G09
18845 G07
18845 G08
0.1Hz to 10Hz Noise
0.01Hz to 1Hz Noise
Slew Rate vs Temperature
1.4
1.2
1.0
0.8
0.6
0.4
V
T
= ±15V
= 25°C
V
T
= ±15V
= 25°C
S
A
S
A
RISING
S
V
= ±15V
RISING
= ±5V
V
S
FALLING
= ±15V
V
S
FALLING
= ±5V
V
S
–50 –30 –10 10 30 50 70 90 110
TIME (2s/DIV)
TIME (20s/DIV)
TEMPERATURE (°C)
18845 G10
18845 G11
18845 G12
Settling Time to 0.01%
vs Output Step
Supply Current per Amplifier
vs Supply Voltage
Input Bias Current
vs Common Mode Voltage
10
8
1.25
1.00
0.75
0.50
0.25
0
1000
750
500
250
T
= 25°C
V
= ±15V
A
S
T
T
= 85°C
A
6
A
= 1
= 1
8
A = –1
V
V
+
–
4
I
I
BIAS
BIAS
= 25°C
A
2
0
0
T
= –40°C
–2
–4
–6
–8
–10
A
–250
A
A = –1
V
V
–500
–750
–1000
0
2
4
6
10 12 14 16 18 20
0
4
8
12 16 20 24 28 32 36 40
SUPPLY VOLTAGE (V)
18845 G14
–15
–10
–5
5
10
15
0
SETTLING TIME (µs)
COMMON MODE VOLTAGE (V)
18845 G13
LTXXXX • TPCXX
7
LT1884/LT1885
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Gain vs Frequency (AV = 1)
Channel Separation vs Frequency
10
–20
–30
–40
–50
–60
–70
–80
–90
0
–10
–20
–30
–40
V
= ±15V
S
V
S
= ±2.5V
–100
–110
–120
1k
10k
100k
1M
10M
100M
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
18845 G17
18845 G16
Gain vs Frequency vs CLOAD
(AV = –1)
Gain vs Frequency vs CLOAD
(AV = 1)
10
0
10
0
C
LOAD
= 500pF
–10
–20
–30
–40
–10
–20
–30
–40
C
= 300pF
= 100pF
LOAD
C
LOAD
C
C
C
C
= 330pF
= 150pF
= 50pF
= 0pF
LOAD
LOAD
LOAD
LOAD
C
= 0pF
LOAD
1k
10k
100k
1M
10M
100M
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
18845 G18
18845 G19
Large-Signal Response
Small-Signal Response
5V/DIV
20mV/DIV
18845 G20
18845 G21
VS = ±15V
50µs/DIV
VS = ±15V
2µs/DIV
RF = RG = 10k
RF = RG = 10k
A
V = –1
AV = –1
8
LT1884/LT1885
W U U
APPLICATIO S I FOR ATIO
U
The LT1884/LT1885 dual op amp features exceptional
input precision with rail-to-rail output swing. Slew rate
and small-signal bandwidth are superior to other amplifi-
ers with comparable input precision. These characteris-
tics make the LT1884/LT1885 a convenient choice for
precision low voltage systems and for improved AC per-
formance in higher voltage precision systems. Maintain-
ing the advantage of the precision inherent in the amplifier
depends upon proper applications circuit design and
board layout.
interconnect, with the guard driven to the same common
mode voltage as the amplifier inputs.
Input Common Mode Range
The LT1884/LT1885 output is able to swing close to each
power supply rail, but the input stage is limited to operat-
ing between VEE + 0.8V and VCC – 0.9V. Exceeding this
common mode range will cause the gain to drop to zero;
however, no gain reversal will occur.
Input Protection
Preserving Input Precision
The inverting and noninverting input pins of the LT1884/
LT1885havelimitedon-chipprotection. ESDprotectionis
provided to prevent damage during handling. The input
transistorshavevoltageclampingandlimitingresistorsto
protect against input differentials up to 10V. Short tran-
sients above this level will also be tolerated. If the input
pins may be subject to a sustained differential voltage
above 10V, external limiting resistors should be used to
preventdamagetotheamplifier.A1kresistorineachinput
lead will provide protection against a 30V differential
voltage.
Preserving the input voltage accuracy of the LT1884/
LT1885requiresthattheapplicationscircuitandPCboard
layout do not introduce errors comparable to or greater
than the 30µV offset. Temperature differentials across the
input connections can generate thermocouple voltages of
10s of microvolts. PC board layouts should keep connec-
tions to the amplifier’s input pins close together and away
fromheatdissipatingcomponents.Aircurrentsacrossthe
board can also generate temperature differentials.
The extremely low input bias currents, 100pA, allow high
accuracy to be maintained with high impedance sources
and feedback networks. The LT1884/LT1885’s low input
bias currents are obtained by using a cancellation circuit
on-chip. This causes the resulting IBIAS+ and IBIAS– to be
uncorrelated, as implied by the IOS specification being
comparabletotheIBIAS. Theusershouldnottrytobalance
the input resistances in each input lead, as is commonly
recommended with most amplifiers. The impedance at
either input should be kept as small as possible to mini-
mize total circuit error.
Capacitive Loads
The LT1884/LT1885 can drive capacitive loads up to
300pF when configured for unity gain. The capacitive load
driving capability increases as the amplifier is used in
higher gain configurations. Capacitive load driving may
also be increased by decoupling the capacitance from the
output with a small resistance.
Input Bias Currents
PC board layout is important to ensure that leakage
currents do not corrupt the low IBIAS of the amplifier. In
high precision, high impedance circuits, the input pins
should be surrounded by a guard ring of PC board
While it may be tempting to seek out a JFET amplifier for
low input bias current, remember that bipolar devices
improve with temperature while JFETs degrade.
9
LT1884/LT1885
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400*
(10.160)
MAX
8
7
6
5
4
0.255 ± 0.015*
(6.477 ± 0.381)
1
2
3
0.130 ± 0.005
0.300 – 0.325
0.045 – 0.065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
0.125
0.020
(0.508)
MIN
(3.175)
MIN
+0.035
0.325
–0.015
0.018 ± 0.003
(0.457 ± 0.076)
0.100
(2.54)
BSC
+0.889
8.255
(
)
N8 1098
–0.381
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
7
5
8
6
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
1
3
4
2
0.010 – 0.020
(0.254 – 0.508)
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.016 – 0.050
(0.406 – 1.270)
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
TYP
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
SO8 1298
10
LT1884/LT1885
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
S Package
14-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.337 – 0.344*
(8.560 – 8.738)
14
13
12
11
10
9
8
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157**
(3.810 – 3.988)
1
2
3
4
5
6
7
0.010 – 0.020
(0.254 – 0.508)
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0° – 8° TYP
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
TYP
0.016 – 0.050
(0.406 – 1.270)
S14 1298
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LT1884/LT1885
U
TYPICAL APPLICATIO
16-Bit Voltage Output DAC on ±5V Supply
5V
5V
1.65k
+
LT1884
–5V
LT1634
4.096V
–
R1
R
COM
REF
R
OFS
33pF
5V
LT1884
–5V
DAC
–
V
OUT
–4.096V
TO 4.096V
LTC®1597
+
18845 TA02
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1112
Dual Picoamp Input Op Amp
Quad Picoamp Input Op Amp
V
V
= 60µV Max
= 60µV Max
OS
OS
LT1114
LT1167
Gain Programmable Instrumentation Amp
Micropower Rail-to-Rail Input and Output Op Amp
Low Noise JFET Op Amp
Gain Error = 0.08% Max
Over-The-TopTM Common Mode Range
LT1490
LT1793
I = 10pA Max
B
LT1881/LT1882
LTC2050
Picoamp Input Rail-to-Rail Output Op Amp
Zero Drift Op Amp in SOT-23
Lower Input Bias Currents Than LT1884/LT1885
V
= 3µV Max, Rail-to-Rail Output
OS
Over-The-Top is a trademark of Linear Technology Corporation.
18845f LT/TP 0400 4K • PRINTED IN USA
12 LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
LINEAR TECHNOLOGY CORPORATION 2000
相关型号：
LT1884CS8#PBF
LT1884 - Dual/Quad Rail-to-Rail Output, Picoamp Input Precision Op Amps; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C
Linear
LT1884CS8#TR
LT1884 - Dual/Quad Rail-to-Rail Output, Picoamp Input Precision Op Amps; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C
Linear
LT1884CS8#TRPBF
LT1884 - Dual/Quad Rail-to-Rail Output, Picoamp Input Precision Op Amps; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C
Linear
LT1885IS#PBF
LT1885 - Dual/Quad Rail-to-Rail Output, Picoamp Input Precision Op Amps; Package: SO; Pins: 14; Temperature Range: -40°C to 85°C
Linear
LT1885IS#TRPBF
LT1885 - Dual/Quad Rail-to-Rail Output, Picoamp Input Precision Op Amps; Package: SO; Pins: 14; Temperature Range: -40°C to 85°C
Linear
©2020 ICPDF网 联系我们和版权申明