LT1022
High Speed, Precision
JFET Input Operational Amplifier
FEATURES
■
■
DESCRIPTIO
■
■
■
■
Guaranteed
Slew Rate: 23V/µs Min
Guaranteed
Offset Voltage: 250µV Max
– 55°C to 125°C: 750µV Max
Guaranteed
Drift: 5µV/°C Max
Guaranteed
Bias Current:
70°C, 180pA Max
125°C, 4nA Max
Gain-Bandwidth Product: 8.5MHz Typ
Settling Time to 0.05% (10V Step): 0.9µs Typ
The LT
®
1022 JFET input operational amplifier combines
high speed and precision performance.
A 26V/µs slew rate and 8.5MHz gain-bandwidth product
are simultaneously achieved with offset voltage of
typically 80µV, 1.5µV/°C drift, bias currents of 50pA at
70°C, 500pA at 125°C. The output delivers 20mA of load
current without gain degradation.
The 250µV maximum offset voltage specification
represents less than 1/2 least significant bit error in a
14-bit, 10V system.
The LT1022A meets or exceeds all OP-16A and OP-16E
specifications. It is faster and more accurate without
stability problems at cold temperatures.
The LT1022 can be used as the output amplifier for 12-bit
current output D/A converters, as shown below.
For a more accurate, lower power dissipation, but slower
JFET input op amp, please refer to the LT1055 data sheet.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
■
■
■
■
■
Fast D/A Output Amplifiers (12, 14, 16 Bits)
High Speed Instrumentation
Fast, Precision Sample and Hold
Voltage-to-Frequency Converters
Logarithmic Amplifiers
TYPICAL APPLICATIO
12-Bit Voltage Output D/A Converter
C
F
2
0mA TO 2mA
OR 4mA
3
12-BIT CURRENT OUTPUT D/A
CONVERTER (e.g., 6012, 565 OR DAC-80)
15V
Large-Signal Response
LT1022
6
OUTPUT
0V TO 10V
+
4
–15V
5V/DIV
–
7
C
F
= 15pF TO 33pF
SETTLING TIME TO 2mV (0.8 LSB) = 1.5µs TO 2µs
LT1022 • TA01
A
V
= 1
C
L
= 100pF
T
A
= 25°C
V
S
=
±15V
U
0.5µs/DIV
1022fa
U
U
1
LT1022
ABSOLUTE
(Note 1)
AXI U
RATI GS
Operating Temperature Range
LT1022AM/1022M
(OBSOLETE).........–55°C
to 125°C
LT1022AC/1022C .................................... 0°C to 70°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................. 300°C
Supply Voltage ......................................................
±20V
Differential Input Voltage .......................................
±40V
Input Voltage .........................................................
±20V
Output Short Circuit Duration .......................... Indefinite
PACKAGE/ORDER I FOR ATIO
TOP VIEW
N/C
BALANCE
1
–IN
2
+IN
3
4
V–
8
+
7
V
6
OUT
5
BALANCE
ORDER PART
NUMBER
LT1022AMH
LT1022MH
LT1022ACH
LT1022CH
METAL CAN H PACKAGE
T
JMAX
= 150° C,
θ
JA
= 150°C/W,
θ
JC
= 45° C/W
OBSOLETE PACKAGE
Consider the N8 Package as an Alternate Source
LT1022 • POI01
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
OS
l
OS
I
B
Input Offset Voltage (Note 2)
Input Offset Current
Input Bias Current
Input Resistance—Differential
—Common Mode
Input Capacitance
e
n
e
n
i
n
A
VOL
Input Noise Voltage
Input Noise Voltage Density
Input Noise Current Density
Large Signal Voltage Gain
Input Voltage Range
CMRR
PSRR
V
OUT
SR
Common-Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing
Slew Rate
V
CM
=
±10.5V
0.1Hz to 10Hz
CONDITIONS
H Package
N8 Package
Fully Warmed Up
Fully Warmed Up
V
CM
= +10V
V
S
=
±
15V, T
A
= 25°C, V
CM
= 0V unless otherwise noted.
LT1022AM
LT1022AC
TYP
MAX
80
2
±10
30
10
12
10
12
10
11
4
2.5
28
14
1.8
150
130
±10.5
86
88
±12
23
400
300
±12
94
104
±13.2
26
50
20
4
120
100
±10.5
82
86
±12
18
250
10
±50
100
LT1022M, LT1022CH
LT1022CN8
MIN
TYP
MAX
100
160
2
±10
30
10
12
10
12
10
11
4
2.8
30
15
1.8
400
300
±12
92
102
±13.2
24
60
22
4
600
1000
20
±50
150
V
CM
= –11V to 8V
V
CM
= 8V to 11V
f
O
= 10Hz (Note 3)
f
O
= 1kHz (Note 4)
f
O
= 10Hz, 1kHz (Note 5)
V
O
=
±10V
R
L
= 2k
R
L
= 1k
V
S
=
±10V
to
±18V
R
L
= 2k
2
U
U
W
W W
U
W
TOP VIEW
BAL
–IN
+IN
V–
1
2
3
4
8
7
6
5
N/C
V+
OUT
BAL
ORDER PART
NUMBER
LT1022CN8
N8 PACKAGE 8-LEAD PDIP
T
JMAX
= 100°C,
θ
JA
= 130°C/W
MIN
UNITS
µV
µV
pA
pA
pA
Ω
Ω
Ω
pF
µV/
P-P
nV/√Hz
nV/√Hz
fA√Hz
V/mV
V/mV
V
dB
dB
V
V/µs
1022fa
LT1022
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
GBW
I
S
Gain-Bandwidth Product
Supply Current
Settling Time
A = +1 or A = –1
10V Step to 0.05%
10V Step to 0.02%
R
POT
= 100k
CONDITIONS
f = 1MHz
V
S
=
±
15V, T
A
= 25°C, V
CM
= 0V unless otherwise noted.
LT1022AM
LT1022AC
TYP
MAX
8.5
5.2
0.9
1.3
±7
7.0
LT1022M, LT1022CH
LT1022CN8
MIN
TYP
MAX
8.0
5.2
0.9
1.3
±7
7.0
MIN
UNITS
MHz
mA
µs
µs
mV
Offset Voltage Adjustment Range
The
●
denotes the specifications which apply over the full operating temperature range of V
CM
= 0V, 0°C
≤
T
A
≤
70°C. V
S
=
±
15V,
unless otherwise noted.
LT1022AC
TYP
140
1.3
15
±50
80
85
86
±12
250
93
103
±13.1
LT1022CH
LT1022CN8
TYP
MAX
180
300
1.8
3.0
18
±60
60
80
84
±12
250
91
101
±13.1
1000
1700
9.0
15.0
100
±250
SYMBOL PARAMETER
V
OS
Input Offset Voltage
(Note 2)
Average Temperature
Coefficient of Input Offset Voltage
I
OS
I
B
A
VOL
CMRR
PSRR
V
OUT
Input Offset Current
Input Bias Current
Large-Signal Voltage Gain
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing
CONDITIONS
H Package
N8 Package
H Package
N8 Package (Note 6)
Warmed Up, T
A
= 70°C
Warmed Up, T
A
= 70°C
V
O
=
±10V,
R
L
= 2k
V
CM
=
±10.4V
V
S
=
±10V
to
±18V
R
L
= 2k
●
●
●
●
●
●
●
●
●
●
MIN
MAX
480
5.0
80
±200
MIN
UNITS
µV
µV
µV/°C
µV/°C
pA
pA
V/mV
dB
dB
V
The
●
denotes the specifications which apply over the full operating temperature range of – 55°C
≤
T
A
≤
125°C. V
S
=
±
15V, V
CM
= 0V,
unless otherwise noted.
SYMBOL PARAMETER
V
OS
Input Offset Voltage
Average Temperature
Coefficient of Input Offset Voltage
I
OS
I
B
A
VOL
CMRR
PSRR
V
OUT
Input Offset Current
Input Bias Current
Large Signal Voltage Gain
Common-Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing
CONDITIONS
(Note 2)
(Note 6)
Warmed Up, T
A
= 125°C
Warmed Up, T
A
= 125°C
V
O
=
±10V,
R
L
= 2k
V
CM
=
±10.4V
V
S
=
±10V
to
±17V
R
L
= 2k
●
●
●
●
●
●
●
●
MIN
LT1022AM
TYP
230
1.5
0.3
±
0.5
MAX
750
5.0
2.0
±
4.0
MIN
LT1022M
TYP
300
2.0
0.30
±
0.7
MAX
1500
9.0
3.0
±
6.0
UNITS
µV
µV/°C
nA
nA
V/mV
dB
dB
V
40
85
86
±12
120
92
102
±12.9
35
80
84
±12
120
90
100
±12.9
Note 1:
Absolute Maximum Ratings are those values beyond which the
life of a device may be impaired.
Note 2:
Offset voltage is measured under two different conditions:
(a) approximately 0.5 seconds after application of power;
(b) at T
A
= 25°C, with the chip self-heated to approximately 45°C
to account for chip temperature rise when the device is fully warmed up.
Note 3:
10Hz noise voltage density is sample tested on every lot of A
grades. Devices 100% tested at 10Hz are available on request.
Note 4:
This parameter is tested on a sample basis only.
Note 5:
Current noise is calculated from the formula: i
n
= (2qI
B
)
1/2
, where
q = 1.6 • 10
–19
coulomb. The noise of source resistors up to 1GΩ swamps
the contribution of current noise.
Note 6:
Offset voltage drift with temperature is practically unchanged when
the offset voltage is trimmed to zero with a 100k potentiometer between
the balance terminals and the wiper tied to V
+
. Devices tested to tighter
drift specifications are available on request.
1022fa
3
LT1022
TYPICAL PERFOR A CE CHARACTERISTICS
Gain vs Frequency
140
V
S
=
±15V
120
100
T
A
= 25°C
GAIN (dB)
GAIN (dB)
SLEW RATE (V/µs)
20
C
L
= 10pF
10
GAIN
120
140
160
PHASE
C
L
= 300pF
V
S
=
±15V
T
A
= 25°C
C
L
= 300pF
1
3
180
200
220
C
L
= 10pF
240
100
PHASE SHIFT (DEGREES)
80
60
40
20
0
–20
1
10
100
1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
LT1022 • TPC01
PHASE MARGIN (DEGREES)
T
A
= 125°C
T
A
= –55°C
Undistorted Output Swing vs
Frequency
30
OUTPUT VOLTAGE SWING FROM 0V (V)
PEAK-TO-PEAK OUTPUT SWING (V)
V
S
=
±15V
T
A
= 25°C
24
18
20mV/DIV
12
6
0
100k
1M
FREQUENCY (Hz)
LT1022 • TPC04
The typical behavior of many LT1022 parameters is identical to the LT1056. Please refer to the LT1055/1056 data
sheet for the following typical performance characteristics:
Input Bias and Offset Currents vs Temperature
Input Bias Current Over the Common-Mode Range
Distribution of Input Offset Voltage (H and N8 Package)
Distribution of Offset Voltage Drift with Temperature
Warm-Up Drift
Long Term Drift of Representative Units
0.1Hz to 10Hz Noise
Voltage Noise vs Frequency
Noise vs Chip Temperature
Short Circuit Current vs Time
Output Impedance vs Frequency
Common Mode Range vs Temperature
Common Mode and Power Supply Rejections vs Temperature
Common Mode Rejection Ratio vs Frequency
Power Supply Rejection Ratio vs Frequency
Voltage Gain vs Temperature
Supply Current vs Supply Voltage
Output Swing vs Load Resistance
4
U W
10M
Gain, Phase Shift vs Frequency
30
C
LMAX
≈
500pF
(A
V
= +1)
80
100
40
Phase Margin, Gain Bandwidth
Product, Slew Rate vs Temperature
V
S
=
±15V
C
L
= 10pF
30
SLEW
20
GBW (f = 1MHz)
60
12
11
10
9
8
7
50
θ
M
6
GAIN BANDWIDTH PRODUCT (MHz)
0
–10
10
30
FREQUENCY (MHz)
40
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
LT1022 • TPC02
LT1022 • TPC03
Small-Signal Response
10
Settling Time
10mV
5mV 2mV
5
1mV
0.5mV
0
2mV
V
S
=
±15V
T
A
= 25°C
–5
5mV
10mV
–10
0
1
1mV
2
0.5mV
3
LT1022 • TPC05
A
V
= +1
C
L
= 100pF
T
A
= 25°C
V
S
=
±15V
0.2µs/DIV
SETTLING TIME (µs)
1022fa
LT1022
APPLICATIO S I FOR ATIO
The LT1056 applications information is directly
applicable to the LT1022. Please consult the
LT1055/1056 data sheet for details on:
(1) plug-in compatibility to industry standard devices
(2) offset nulling
(3) achieving picoampere/microvolt performance
TYPICAL APPLICATIO S
Fast Piezoelectric Accelerometer
1pF TO 5pF
ENDEVCO #2215
ACCELEROMETER
2
U
(4) phase-reversal protection
(5) high speed operation (including settling time
test circuit)
(6) noise performance
(7) simplified circuit schematic
10
10
Ω
W
U
U U
–
+
15V
7
LT1022
6
OUTPUT
3
4
–15V
LT1022 • TA03
1022fa
5
嵌入式系统
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