FEATURES
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LT1468
90MHz, 22V/µs
16-Bit Accurate
Operational Amplifier
DESCRIPTION
The LT
®
1468 is a precision high speed operational amplifier
with 16-bit accuracy and 900ns settling to 150μV for 10V
signals. This unique blend of precision and AC performance
makes the LT1468 the optimum choice for high accuracy
applications such as DAC current-to-voltage conversion
and ADC buffers. The initial accuracy and drift character-
istics of the input offset voltage and inverting input bias
current are tailored for inverting applications.
The 90MHz gain bandwidth ensures high open-loop gain
at frequency for reducing distortion. In noninverting ap-
plications such as an ADC buffer, the low distortion and
DC accuracy allow full 16-bit AC and DC performance.
The 22V/μs slew rate of the LT1468 improves large-signal
performance in applications such as active filters and
instrumentation amplifiers compared to other precision
op amps.
The LT1468 is manufactured on a complementary bipolar
process. It is available in a space saving 3mm
×
3mm lead-
less package, as well as small outline and DIP packages.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
90MHz Gain Bandwidth, f = 100kHz
22V/μs Slew Rate
Settling Time: 900ns (A
V
= –1, 150μV, 10V Step)
Low Distortion, – 96.5dB for 100kHz, 10V
P-P
Maximum Input Offset Voltage: 75μV
Maximum Input Offset Voltage Drift: 2μV/°C
Maximum (–) Input Bias Current: 10nA
Minimum DC Gain: 1000V/mV
Minimum Output Swing into 2k: ±12.8V
Unity Gain Stable
Input Noise Voltage: 5nV/√Hz
Input Noise Current: 0.6pA/√Hz
Total Input Noise Optimized for 1k < R
S
< 20k
Specified at ±5V and ±15V
APPLICATIONS
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16-Bit DAC Current-to-Voltage Converter
Precision Instrumentation
ADC Buffer
Low Distortion Active Filters
High Accuracy Data Acquisition Systems
Photodiode Amplifiers
TYPICAL APPLICATION
Total Harmonic Distortion vs Frequency
16-Bit DAC I-to-V Converter
TOTAL HARMONIC DISTORTION (dB)
–80
V
S
= ±15V
A
V
= 2
R
L
= 2k
V
OUT
= 10V
P-P
–90
20pF
DAC
INPUTS
16
6k
–
LT1468
–100
2k
V
OUT
50pF
LTC
®
1597
–110
+
OPTIONAL NOISE FILTER
OFFSET: V
OS
+ I
B
(6kΩ) < 1LSB
SETTLING TIME TO 150μV = 1.7μs
SETTLING LIMITED BY 6k AND 20pF TO COMPENSATE DAC OUTPUT CAPACITANCE
1468 TA01
–120
–130
100
1k
10k
FREQUENCY (Hz)
100k
1468 TA02
1468fa
1
LT1468
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage (V
+
to V
–
).................................36V
Maximum Input Current (Note 2) ...........................10mA
Output Short-Circuit Duration (Note 3) ............ Indefinite
Operating Temperature Range ................. –40°C to 85°C
Specified Temperature Range (Note 4) .... –40°C to 85°C
Junction Temperature ........................................... 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
TOP VIEW
NULL 1
NULL 1
–IN 2
+IN 3
V
–
4
8
DNC*
V
+
TOP VIEW
8
DNC*
V
+
OUT
NULL
+
–
7
6
5
–IN 2
+IN 3
V
–
4
N8 PACKAGE
8-LEAD PDIP
OUT
NULL
+
–
7
6
5
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 150°C,
θ
JA
= 43°C/W
EXPOSED PAD IS INTERNALLY CONNECTED TO V
–
S8 PACKAGE
8-LEAD PLASTIC SO
*DO NOT CONNECT
T
JMAX
= 150°C,
θ
JA
= 130°C/W (N8)
T
JMAX
= 150°C,
θ
JA
= 190°C/W (S8)
ORDER INFORMATION
LEAD FREE FINISH
LT1468CN8#PBF
LT1468IN8#PBF
LT1468CS8#PBF
LT1468IS8#PBF
LT1468ACDD#PBF
LT1468AIDD#PBF
LT1468CDD#PBF
LT1468IDD#PBF
LEAD BASED FINISH
LT1468CN8
LT1468IN8
LT1468CS8
LT1468IS8
TAPE AND REEL
NA
NA
LT1468CS8#TRPBF
LT1468IS8#TRPBF
LT1468ACDD#TRPBF
LT1468AIDD#TRPBF
LT1468CDD#TRPBF
LT1468IDD#TRPBF
TAPE AND REEL
NA
NA
LT1468CS8#TR
LT1468IS8#TR
PART MARKING
LT1468CN8
LT1468IN8
1468
1468I
LDJX
LDJX
LDJX
LDJX
PART MARKING
LT1468CN8
LT1468IN8
1468
1468I
PACKAGE DESCRIPTION
8-Lead PDIP
8-Lead PDIP
8-Lead Plastic Small Outline
8-Lead Plastic Small Outline
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
PACKAGE DESCRIPTION
8-Lead PDIP
8-Lead PDIP
8-Lead Plastic Small Outline
8-Lead Plastic Small Outline
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
1468fa
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LT1468
ELECTRICAL CHARACTERISTICS
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
N8, S8
LT1468A, DD Package
LT1468, DD Package
I
OS
I
B–
I
B
+
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CM
= 0V unless otherwise noted.
CONDITIONS
V
SUPPLY
±15V
± 5V
±15V
± 5V
±15V
± 5V
±5V to ±15V
±5V to ±15V
±5V to ±15V
0.1Hz to 10Hz
f = 10kHz
f = 10kHz
V
CM
= ±12.5V
Differential
±5V to ±15V
±5V to ±15V
±5V to ±15V
±15V
±15V
±15V
±15V
±5V
±15V
±5V
V
CM
= ±12.5V
V
CM
= ±2.5V
V
S
= ±4.5V to ±15V
V
OUT
= ±12.5V, R
L
= 10k
V
OUT
= ±12.5V, R
L
= 2k
V
OUT
= ±2.5V, R
L
= 10k
V
OUT
= ±2.5V, R
L
= 2k
R
L
= 10k
R
L
= 2k
R
L
= 10k
R
L
= 2k
V
OUT
= ±12.5V
V
OUT
= ±2.5V
V
OUT
= 0V, V
IN
= ±0.2V
A
V
= –1, R
L
= 2k (Note 5)
10V Peak, (Note 6)
3V Peak, (Note 6)
f = 100kHz, R
L
= 2k
A
V
= 2, V
O
= 10V
P-P
, f = 1kHz
A
V
= 2, V
O
= 10V
P-P
, f = 100kHz
A
V
= 1, 10% to 90%, 0.1V
A
V
= 1, 0.1V
A
V
= 1, 50% V
IN
to 50% V
OUT
,
0.1V
±15V
±15V
±5V
±5V
±15V
±15V
± 5V
±5V
±15V
±5V
±15V
±15V
± 5V
±15V
±5V
±15V
±5V
±15V
±15V
±15V
±5V
±15V
±5V
±15V
±5V
60
55
±15V
±5V
96
96
100
1000
500
1000
500
±13.0
±12.8
±3.0
±2.8
±15
±15
±25
15
11
12.5
2.5
100
50
MIN
TYP
30
50
30
50
100
150
13
3
–10
0.3
5
0.6
240
150
4
13.5
3.5
–14.3
–4.3
110
112
112
9000
5000
6000
3000
±13.6
±13.5
±3.6
±3.5
±22
±22
±40
22
17
350
900
90
88
0.00007
0.0015
11
12
30
35
9
10
–12.5
–2.5
MAX
75
175
75
175
200
300
50
±10
±40
UNITS
μV
μV
μV
μV
μV
μV
nA
nA
nA
μV
P-P
nV/√Hz
pA/√Hz
MΩ
kΩ
pF
V
V
V
V
dB
dB
dB
V/mV
V/mV
V/mV
V/mV
V
V
V
V
mA
mA
mA
V/μs
V/μs
kHz
kHz
MHz
MHz
%
%
ns
ns
%
%
ns
ns
Input Offset Current
Inverting Input Bias Current
Noninverting Input Bias Current
Input Noise Voltage
Input Noise Voltage
Input Noise Voltage
Input Resistance
Input Capacitance
Input Voltage Range +
Input Voltage Range –
e
n
i
n
R
IN
C
IN
CMRR
PSRR
A
VOL
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
OUT
Output Swing
I
OUT
I
SC
SR
Output Current
Short-Circuit Current
Slew Rate
Full-Power Bandwidth
GBW
THD
t
r
, t
f
Gain Bandwidth
Total Harmonic Distortion
Rise Time, Fall Time
Overshoot
Propagation Delay
1468fa
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LT1468
ELECTRICAL CHARACTERISTICS
SYMBOL
t
s
PARAMETER
Settling Time
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CM
= 0V unless otherwise noted.
CONDITIONS
10V Step, 0.01%, A
V
= –1
10V Step, 150μV, A
V
= –1
5V Step, 0.01%, A
V
= –1
A
V
= 1, f = 100kHz
V
SUPPLY
±15V
±15V
±5V
±15V
±15V
±5V
MIN
TYP
760
900
770
0.02
3.9
3.6
5.2
5.0
MAX
UNITS
ns
ns
ns
Ω
mA
mA
R
O
I
S
Output Resistance
Supply Current
The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
0°C ≤ T
A
≤ 70°C, V
CM
= 0V unless otherwise noted.
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
CONDITIONS
N8, S8
LT1468A, DD Package
LT1468, DD Package
Input V
OS
Drift
I
OS
I
B–
I
B+
CMRR
PSRR
A
VOL
Input Offset Current
Input Offset Current Drift
Inverting Input Bias Current
Negative Input Current Drift
Noninverting Input Bias Current
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
CM
= ±12.5V
V
CM
= ±2.5V
V
S
= ±4.5V to ±15V
V
OUT
= ±12.5V, R
L
= 10k
V
OUT
= ±12.5V, R
L
= 2k
V
OUT
= ±2.5V, R
L
= 10k
V
OUT
= ±2.5V, R
L
= 2k
R
L
= 10k
R
L
= 2k
R
L
= 10k
R
L
= 2k
V
OUT
= ±12.5V
V
OUT
= ±2.5V
V
OUT
= 0V, V
IN
= ±0.2V
A
V
= –1, R
L
= 2k (Note 5)
f = 100kHz, R
L
= 2k
±15V
±15V
±5V
±5V
±15V
±15V
±5V
±5V
±15V
±5V
±15V
±15V
±5V
±15V
± 5V
±15V
±5V
(Note 7)
V
SUPPLY
±15V
± 5V
±15V
± 5V
±15V
± 5V
±5V to ±15V
±5V to ±15V
±5V to ±15V
±5V to ±15V
± 5V to ±15V
±5V to ±15V
±15V
±5V
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
MIN
TYP
MAX
150
250
150
250
300
400
UNITS
μV
μV
μV
μV
μV
μV
μV/°C
nA
pA/°C
nA
pA/°C
nA
dB
dB
dB
V/mV
V/mV
V/mV
V/mV
V
V
V
V
mA
mA
mA
V/μs
V/μs
MHz
MHz
0.7
60
2.0
65
±15
40
±50
94
94
98
500
250
500
250
±12.9
±12.7
±2.9
±2.7
±12.5
±12.5
±17
13
9
55
50
6.5
6.3
V
OUT
Output Swing
I
OUT
I
SC
SR
GBW
I
S
Output Current
Short-Circuit Current
Slew Rate
Gain Bandwidth
Supply Current
mA
mA
1468fa
4
LT1468
ELECTRICAL CHARACTERISTICS
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
N8, S8
LT1468A, DD Package
LT1468, DD Package
Input V
OS
Drift
I
OS
I
B–
I
B+
CMRR
PSRR
A
VOL
Input Offset Current
Input Offset Current Drift
Inverting Input Bias Current
Negative Input Current Drift
Noninverting Input Bias Current
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
CM
= ±12.5V
V
CM
= ±2.5V
V
S
= ±4.5V to ±15V
V
OUT
= ±12V, R
L
= 10k
V
OUT
= ±10V, R
L
= 2k
V
OUT
= ±2.5V, R
L
= 10k
V
OUT
= ±2.5V, R
L
= 2k
R
L
= 10k
R
L
= 2k
R
L
= 10k
R
L
= 2k
V
OUT
= ±12.5V
V
OUT
= ±2.5V
V
OUT
= 0V, V
IN
= ±0.2V
A
V
= –1, R
L
= 2k (Note 5)
f = 100kHz, R
L
= 2k
±15V
±15V
±5V
±5V
±15V
±15V
±5V
±5V
±15V
±5V
±15V
±15V
±5V
±15V
±5V
±15V
±5V
(Note 7)
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. –40°C ≤ T
A
≤ 85°C, V
CM
= 0V unless otherwise noted.
CONDITIONS
V
SUPPLY
±15V
± 5V
±15V
± 5V
±15V
± 5V
±5V to ±15V
±5V to ±15V
±5V to ±15V
±5V to ±15V
±5V to ±15V
±5V to ±15V
±15V
±5V
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
MIN
TYP
MAX
230
330
230
330
400
500
UNITS
μV
μV
μV
μV
μV
μV
μV/°C
nA
pA/°C
nA
pA/°C
nA
dB
dB
dB
V/mV
V/mV
V/mV
V/mV
V
V
V
V
mA
mA
mA
V/μs
V/μs
MHz
MHz
0.7
120
2.5
80
±30
80
±60
92
92
96
300
150
300
150
±12.8
±12.6
±2.8
±2.6
±7
±7
±12
9
6
45
40
7.0
6.8
V
OUT
Output Swing
I
OUT
I
SC
SR
GBW
I
S
Output Current
Short-Circuit Current
Slew Rate
Gain Bandwidth
Supply Current
mA
mA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The inputs are protected by back-to-back diodes and two 100Ω
series resistors. If the differential input voltage exceeds 0.7V, the input
current should be limited to 10mA. Input voltages outside the supplies will
be clamped by ESD protection devices and input currents should also be
limited to 10mA.
Note 3:
A heat sink may be required to keep the junction temperature
below absolute maximum when the output is shorted indefinitely.
Note 4:
The LT1468C is guaranteed to meet specified performance from
0°C to 70°C and is designed, characterized and expected to meet these
extended temperature limits, but is not tested at – 40°C and at 85°C. The
LT1468I is guaranteed to meet the extended temperature limits.
Note 5:
Slew rate is measured between ±8V on the output with ±12V input
for ±15V supplies and ±2V on the output with ±3V input for ±5V supplies.
Note 6:
Full power bandwidth is calculated from the slew rate
measurement: FPBW = SR/2πV
P
Note 7:
This parameter is not 100% tested.
1468fa
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