LT1468-2
200MHz, 30V/µs
16-Bit Accurate
AV ≥ 2 Op Amp
Features
Description
Stable in Gain AV ≥ 2 (AV = –1)
n 200MHz Gain Bandwidth Product
n 30V/μs Slew Rate
n Settling Time: 800ns (10V Step, 150µV)
n Specified at ±5V and ±15V Supplies
n Low Distortion, – 96.5dB for 100kHz, 10V
P-P
n Maximum Input Offset Voltage: 75µV
n Maximum Input Offset Voltage Drift: 2µV/°C
n Maximum (–) Input Bias Current: 10nA
n Minimum DC Gain: 1000V/mV
n Minimum Output Swing into 2k: ±12.8V
n Input Noise Voltage: 5nV/√Hz
n Input Noise Current: 0.6pA/√Hz
n Total Input Noise Optimized for 1k < R < 20k
S
n Available in an 8-Lead Plastic SO Package
and 8-Lead DFN Package
The LT®1468-2 is a precision high speed operational amplifier with 16-bit accuracy, decompensated to be stable in a
gain of 2 or greater. The combination of precision and AC
performance makes the LT1468-2 the optimum choice for
high accuracy applications such as DAC current-to-voltage
conversion and ADC buffers. The initial accuracy and drift
characteristics of the input offset voltage and inverting
input bias current are tailored for inverting applications.
n
The 200MHz gain bandwidth ensures high open-loop gain
at frequency for reducing distortion. In noninverting applications such as an ADC buffer, the low distortion and
DC accuracy allow full 16-bit AC and DC performance.
The high slew rate of the LT1468-2 improves large-signal
performance in applications such as active filters and
instrumentation amplifiers compared to other precision
op amps.
The LT1468-2 is specified on power supply voltages of
±5V and ±15V and from –40°C to 85°C. For a unity-gain
stable op amp with same DC performance, see the LT1468
data sheet.
Applications
16-Bit DAC Current-to-Voltage Converter
Precision Instrumentation
n ADC Buffer
n Low Distortion Active Filters
n High Accuracy Data Acquisition Systems
n Photodiode Amplifiers
n
n
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.
Typical Application
16-Bit DAC I-to-V Converter
Large Signal Transient, AV = –1
20pF
DAC
INPUTS
16
6k
®
LTC 1597
–
LT1468-2
+
VS = ±15V
AV = –1
RF = RG = 2k
CF = 22pF
10V
2k
VOUT
50pF
OPTIONAL NOISE FILTER
OFFSET: VOS + IB (6kΩ) < 1LSB
SETTLING TIME TO 150µV = 1.6µs
SETTLING LIMITED BY 6k AND 20pF TO COMPENSATE DAC OUTPUT CAPACITANCE
14682 TA01
2V/DIV
0V
200ns/DIV
14682 TA02
14682fb
1
LT1468-2
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)
for S8 Only......................................................... 300°C
Pin Configuration
TOP VIEW
NULL 1
–IN 2
+IN 3
–
+
V– 4
TOP VIEW
NULL 1
8
DNC*
7
V+
–IN 2
6
OUT
+IN 3
5
NULL
V– 4
–
+
8
DNC*
7
V+
6
VOUT
5
NULL
S8 PACKAGE
8-LEAD PLASTIC SO
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
*DO NOT CONNECT
TJMAX = 150°C, θJA = 43°C/W
EXPOSED PAD IS INTERNALLY CONNECTED TO V–
TJMAX = 150°C, θJA = 190°C/W
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
SPECIFIED TEMPERATURE RANGE
LT1468CS8-2#PBF
LT1468CS8-2#TRPBF
14682
8-Lead Plastic Small Outline
0°C to 70°C
LT1468IS8-2#PBF
LT1468IS8-2#TRPBF
14682
8-Lead Plastic Small Outline
–40°C to 85°C
LT1468ACDD-2#PBF
LT1468ACDD-2#TRPBF
LDSY
8-Lead (3mm × 3mm) Plastic DFN
0°C to 70°C
LT1468AIDD-2#PBF
LT1468AIDD-2#TRPBF
LDSY
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LT1468CDD-2#PBF
LT1468CDD-2#TRPBF
LDSY
8-Lead (3mm × 3mm) Plastic DFN
0°C to 70°C
LT1468IDD-2#PBF
LT1468IDD-2#TRPBF
LDSY
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/
electrical characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCM = 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
TYP
MAX
UNITS
VOS
Input Offset Voltage
S8 Package
±15V
± 5V
30
50
75
175
µV
µV
LT1468A, DD Package
±15V
± 5V
30
50
75
175
µV
µV
LT1468, DD Package
±15V
± 5V
100
150
200
300
µV
µV
±5V to ±15V
13
50
IOS
Input Offset Current
VSUPPLY
MIN
nA
14682fb
2
LT1468-2
Electrical
Characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCM = 0V unless otherwise noted.
SYMBOL
PARAMETER
–
Inverting Input Bias Current
+
Noninverting Input Bias Current
IB
CONDITIONS
VSUPPLY
MIN
TYP
MAX
UNITS
±5V to ±15V
3
±10
nA
±40
±5V to ±15V
–10
Input Noise Voltage
0.1Hz to 10Hz
±5V to ±15V
0.3
en
Input Noise Voltage
f = 10kHz
±5V to ±15V
5
nV/√Hz
±5V to ±15V
IB
in
Input Noise Voltage
f = 10kHz
RIN
Input Resistance
VCM = ±12.5V
Differential
CIN
Input Capacitance
±15V
Input Voltage Range +
±15V
±5V
Input Voltage Range –
±15V
±5V
CMRR
Common Mode Rejection Ratio
VCM = ±12.5V
VCM = ±2.5V
PSRR
Power Supply Rejection Ratio
VS = ±4.5V to ±15V
AVOL
Large-Signal Voltage Gain
VOUT = ±12.5V, RL = 10k
VOUT = ±12.5V, RL = 2k
VOUT = ±2.5V, RL = 10k
VOUT = ±2.5V, RL = 2k
VOUT
Output Swing
IOUT
±15V
±15V
100
50
12.5
2.5
0.6
pA/√Hz
240
150
MΩ
kΩ
4
pF
13.5
3.5
V
V
–14.3
–4.3
±15V
±5V
nA
µVP-P
–12.5
–2.5
V
V
96
96
110
112
dB
dB
100
112
dB
±15V
±15V
±5V
±5V
1000
500
1000
500
9000
5000
6000
3000
V/mV
V/mV
V/mV
V/mV
RL = 10k
RL = 2k
RL = 10k
RL = 2k
±15V
±15V
± 5V
±5V
±13.0
±12.8
±3.0
±2.8
±13.6
±13.5
±3.6
±3.5
V
V
V
V
Output Current
VOUT = ±12.5V
VOUT = ±2.5V
±15V
±5V
±15
±15
±22
±22
mA
mA
ISC
Short-Circuit Current
VOUT = 0V, VIN = ±0.2V
±15V
±25
±40
mA
SR
Slew Rate
RL = 2k (Note 5)
±15V
± 5V
20
15
30
22
V/µs
V/µs
Full-Power Bandwidth
10V Peak, (Note 6)
3V Peak, (Note 6)
±15V
±5V
475
1160
kHz
kHz
GBW
Gain Bandwidth
f = 100kHz, RL = 2k
±15V
±5V
200
190
MHz
MHz
ts
Settling Time
10V Step, 0.01%, AV = –1
10V Step, 150µV, AV = –1
5V Step, 0.01%, AV = –1
±15V
±15V
±5V
650
800
550
ns
ns
ns
RO
Output Resistance
AV = –1, f = 100kHz
±15V
0.02
IS
Supply Current
±15V
±5V
3.9
3.6
140
130
Ω
5.2
5.0
mA
mA
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VSUPPLY
VOS
Input Offset Voltage
S8 Package
±15V
± 5V
LT1468A, DD Package
LT1468, DD Package
MIN
TYP
MAX
UNITS
●
●
150
250
µV
µV
±15V
± 5V
●
●
150
250
µV
µV
±15V
± 5V
●
●
300
400
µV
µV
14682fb
3
LT1468-2
Electrical
Characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. 0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
Input VOS Drift
(Note 7)
±5V to ±15V
●
IOS
Input Offset Current
±5V to ±15V
●
Input Offset Current Drift
±5V to ±15V
–
VSUPPLY
MIN
TYP
MAX
UNITS
0.7
2.0
µV/°C
65
nA
60
pA/°C
Inverting Input Bias Current
±5V to ±15V
Negative Input Current Drift
± 5V to ±15V
IB+
Noninverting Input Bias Current
±5V to ±15V
●
CMRR
Common Mode Rejection Ratio
VCM = ±12.5V
VCM = ±2.5V
±15V
±5V
●
●
PSRR
Power Supply Rejection Ratio
VS = ±4.5V to ±15V
●
98
dB
AVOL
Large-Signal Voltage Gain
VOUT = ±12.5V, RL = 10k
VOUT = ±12.5V, RL = 2k
VOUT = ±2.5V, RL = 10k
VOUT = ±2.5V, RL = 2k
±15V
±15V
±5V
±5V
●
●
●
●
500
250
500
250
V/mV
V/mV
V/mV
V/mV
VOUT
Output Swing
RL = 10k
RL = 2k
RL = 10k
RL = 2k
±15V
±15V
±5V
±5V
●
●
●
●
±12.9
±12.7
±2.9
±2.7
V
V
V
V
IOUT
Output Current
VOUT = ±12.5V
VOUT = ±2.5V
±15V
±5V
●
●
±12.5
±12.5
mA
mA
ISC
Short-Circuit Current
VOUT = 0V, VIN = ±0.2V
±15V
●
±17
mA
SR
Slew Rate
RL = 2k (Note 5)
±15V
±5V
●
●
18
13
V/µs
V/µs
GBW
Gain Bandwidth
f = 100kHz, RL = 2k
±15V
± 5V
●
●
130
120
IS
Supply Current
±15V
±5V
●
●
IB
±15
●
40
nA
pA/°C
±50
nA
94
94
dB
dB
200
190
MHz
MHz
6.5
6.3
mA
mA
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
–40°C ≤ TA ≤ 85°C, VCM = 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
S8 Package
±15V
± 5V
LT1468A, DD Package
LT1468, DD Package
Input VOS Drift
(Note 7)
VSUPPLY
MAX
UNITS
●
●
230
330
µV
µV
±15V
± 5V
●
●
230
330
µV
µV
±15V
± 5V
●
●
400
500
µV
µV
±5V to ±15V
●
2.5
µV/°C
±5V to ±15V
●
80
nA
IOS
Input Offset Current
Input Offset Current Drift
±5V to ±15V
IB–
Inverting Input Bias Current
±5V to ±15V
Negative Input Current Drift
±5V to ±15V
+
IB
Noninverting Input Bias Current
CMRR
Common Mode Rejection Ratio
VCM = ±12.5V
VCM = ±2.5V
PSRR
Power Supply Rejection Ratio
VS = ±4.5V to ±15V
±5V to ±15V
±15V
±5V
MIN
TYP
0.7
120
pA/°C
±30
●
80
pA/°C
±60
●
nA
nA
●
●
92
92
dB
dB
●
96
dB
14682fb
4
LT1468-2
Electrical
Characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. –40°C ≤ TA ≤ 85°C, VCM = 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VSUPPLY
AVOL
Large-Signal Voltage Gain
VOUT = ±12V, RL = 10k
VOUT = ±10V, RL = 2k
VOUT = ±2.5V, RL = 10k
VOUT = ±2.5V, RL = 2k
±15V
±15V
±5V
±5V
●
●
●
●
300
150
300
150
VOUT
Output Swing
RL = 10k
RL = 2k
RL = 10k
RL = 2k
±15V
±15V
±5V
±5V
●
●
●
●
±12.8
±12.6
±2.8
±2.6
IOUT
Output Current
VOUT = ±12.5V
VOUT = ±2.5V
±15V
±5V
●
●
±7
±7
mA
mA
ISC
Short-Circuit Current
VOUT = 0V, VIN = ±0.2V
±15V
●
±12
mA
SR
Slew Rate
RL = 2k (Note 5)
±15V
±5V
●
●
15
11
V/µs
V/µs
GBW
Gain Bandwidth
f = 100kHz, RL = 2k
±15V
±5V
●
●
110
100
IS
Supply Current
±15V
±5V
●
●
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.
MIN
TYP
MAX
UNITS
V/mV
V/mV
V/mV
V/mV
V
V
V
V
200
190
MHz
MHz
7.0
6.8
mA
mA
Note 4: The LT1468C-2 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-2 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/2πVP
Note 7: This parameter is not 100% tested.
typical performance characteristics
Supply Current vs Supply Voltage
and Temperature
V+
7
5
4
25°C
3
–55°C
2
80
60
–1.0
INPUT BIAS CURRENT (nA)
COMMON MODE RANGE (V)
SUPPLY CURRENT (mA)
125°C
Input Bias Current
vs Input Common Mode Voltage
TA = 25°C
ΔVOS < 100µV
–0.5
6
1
Input Common Mode Range
vs Supply Voltage
–1.5
–2.0
2.0
1.5
1.0
0
5
10
15
SUPPLY VOLTAGE (±V)
20
14682 G01
40
20
0
–20
IB–
IB+
–40
–60
0.5
V–
VS = ±15V
TA = 25°C
0
3
9
12
6
SUPPLY VOLTAGE (±V)
15
18
14682 G02
–80
–15
–10
–5
5
10
0
INPUT COMMON MODE VOLTAGE (V)
15
14682 G03
14682fb
5
LT1468-2
Typical Performance Characteristics
Input Bias Current
vs Temperature
Input Noise Spectral Density
VS = ±15V
INPUT VOLTAGE NOISE (nV/√Hz)
IB–
0
–10
IB+
–20
–30
–40
–50 –25
50
25
75
0
TEMPERATURE (°C)
100
1
en
10
1
125
in
100
1
10
0.1
100
1k
FREQUENCY (Hz)
14682 G06
Open-Loop Gain
vs Resistive Load
5
140
–10
–15
–20
–25
S0-8 ±15V
20
40
60
80 100 120
TIME AFTER POWER UP (s)
160
VS = ±15V
125
120
110
140
Output Voltage Swing
vs Supply Voltage
–1.0
RL = 10k
OUTPUT VOLTAGE SWING (V)
OUTPUT VOLTAGE SWING (V)
–1
–2
–3
–4
4
3
2
RL = 2k
1
RL = 10k
V–
TA = 25°C
0
5
10
15
SUPPLY VOLTAGE (±V)
10
100
1k
LOAD RESISTANCE (Ω)
14682 G10
VS = ±5V
120
110
90
–50 –25
10k
50
25
75
0
TEMPERATURE (°C)
100
VS = ±15V
Output Short-Circuit Current
vs Temperature
60
85°C
25°C
–40°C
–2.0
–2.5
2.5
2.0
1.5
V– 0.5
40°C
85°C
125
14682 G09
Output Voltage Swing
vs Load Current
–1.5
1.0
20
130
14682 G08
V+ –0.5
RL = 2k
140
100
14682 G07
V+
VS = ±15V
VS = ±5V
130
RL = 2k
150
115
–35
0
Open-Loop Gain
vs Temperature
TA = 25°C
135
S0-8 ±5V
OPEN-LOOP GAIN (dB)
OFFSET VOLTAGE DRIFT (µV)
0
–40
TIME (1s/DIV)
14682 G05
Warm-Up Drift vs Time
–30
0.01
100k
10k
14682 G04
–5
VS = ±15V
OPEN-LOOP GAIN (dB)
INPUT BIAS CURRENT (nA)
10
VS = ±15V
TA = 25°C
AV = 101
RS = 100k FOR in
INPUT CURRENT NOISE (pA/√Hz)
20
0.1Hz to 10Hz Voltage Noise
10
VOLTAGE NOISE (100nV/DIV)
1000
OUTPUT SHORT-CIRCUIT CURRENT (mA)
30
25°C
–20 –15 –10 –5 0
10
5
OUTPUT CURRENT (mA)
15
20
14682 G11
55
VS = ±15V
VIN = ±0.2V
50
45
SOURCE
SINK
40
35
30
25
20
15
10
–50
–25
50
25
0
75
TEMPERATURE (°C)
100
125
14682 G12
14682fb
6
LT1468-2
Typical Performance Characteristics
80
60
PHASE
50
60
GAIN
30
20
0
20
TA = 25°C
10 AV = –1
RF = RG = 5.1k
0 CF = 5pF
RL = 2k
–10
100k
10k
1M
10M
FREQUENCY (Hz)
PHASE (DEG)
40
40
GAIN (dB)
6
Gain vs Frequency, AV = –1
TA = 25°C
5 AV = –1
4 RF = RG = 2k
CF = 6.8pF
3 RL = 500Ω
2
CL = 100pF
CL = 47pF
CL = 22pF
1
0
NO CL
–1
–2
–20
–3
–40
–5
100k
AV = –1
15
10
VS = ±15V
5 TA = 25°C
RL = 2k
THD