LT1722/LT1723/LT1724
Single, Dual, Quad 200MHz
Low Noise Precision Op Amps
FEATURES
DESCRIPTION
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The LT®1722/LT1723/LT1724 are single/dual/quad, low
noise, low power, high speed operational amplifiers. These
products feature lower input offset voltage, lower input bias
current and higher DC gain than devices with comparable
bandwidth. The 200MHz gain bandwidth ensures high
open-loop gain at video frequencies.
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3.8nV/√Hz Input Noise Voltage
3.7mA Supply Current
200MHz Gain Bandwidth
Low Total Harmonic Distortion: – 85dBc at 1MHz
70V/μs Slew Rate
400μV Maximum Input Offset Voltage
300nA Maximum Input Bias Current
Unity-Gain Stable
Capacitive Load Stable Up to 100pF
23mA Minimum Output Current
Specified at ±5V and Single 5V
Low Profile (1mm) SOT-23 (ThinSot™) Package
The output drives a 150Ω load to ±3V with ±5V supplies.
On a single 5V supply the output swings from 1.5V to
3.5V with a 500Ω load connected to 2.5V. The amplifier
is unity-gain stable (CLOAD ≤ 100pF).
APPLICATIONS
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The low input noise voltage is achieved with reduced
supply current. The total noise is optimized for a source
resistance between 0.8k and 12k. Due to the input bias
current cancellation technique used, the resistance seen
by each input does not need to be balanced.
Video and RF Amplification
ADSL, HDSL II, VDSL Receivers
Active Filters
Wideband Amplifiers
Buffers
Data Acquisition Systems
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
The LT1722/LT1723/LT1724 are manufactured on Linear
Technology’s advanced low voltage complementary
bipolar process. The LT1722 is available in the SO-8 and
5-pin SOT-23 packages. The LT1723 is available in the
SO-8 and MS8 packages. The LT1724 is available in the
14-lead SO package.
TYPICAL APPLICATION
Differential Video Line Driver
C1 5pF
R3
750Ω
Line Driver Mulitburst Video Signal
R5 2k
–
R7
62.5Ω
+VOUT
0.5V/DIV
1/2 LT1723
+
VIN
75Ω
SOURCE
125Ω
CAT-5
TWISTED PAIR
VIN
C2 5pF
R2
2k
R1
75Ω
VIN/2 62.5Ω
+VOUT LOAD
R4 2k
–
R6
62.5Ω
–VOUT
0.5V/DIV
1723 TA02
1723 TA01
1/2 LT1723
+
–VOUT 62.5Ω
–VIN/2 LOAD
VIN
1V/DIV
–VIN
172234fb
1
LT1722/LT1723/LT1724
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage (V + to V –) ............................. 12.6V
Input Voltage............................................................. ±VS
Differential Input Voltage (Note 2) .........................±0.7V
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
PIN CONFIGURATION
LT1722
LT1722
TOP VIEW
NC 1
8
–
+
–IN 2
+IN 3
V–
7
6
4
5
V+
+IN 3
OUT
1
2
3
4
A
B
+
–
–IN A 2
4 –IN
+IN A 3
V–
4
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
TJMAX = 150°C, θJA = 250°C/W
NC
8
7
6
5
V+
OUT B
–IN B
+IN B
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 250°C/W
A
B
8
V+
7
OUT B
6
–IN B
5
+IN B
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 190°C/W
LT1724
TOP VIEW
OUT A
–IN A
+IN A
V–
OUT A 1
V– 2
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 150°C/W
LT1723
TOP VIEW
5 V+
OUT 1
NC
LT1723
TOP VIEW
TOP VIEW
14 OUT D
OUT A 1
–IN A 2
+IN A 3
–
A
+
D
V+ 4
+IN B 5
–IN B 6
OUT B 7
– 13 –IN D
+ 12 +IN D
11 V–
+
B
–
C
+ 10 +IN C
– 8 –IN C
8
OUT C
S PACKAGE
14-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 100°C/W
172234fb
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LT1722/LT1723/LT1724
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
SPECIFIED
TEMPERATURE RANGE
LT1722CS8#PBF
LT1722CS8#TRPBF
1722
8-Lead Plastic SO
0°C to 70°C
LT1722IS8#PBF
LT1722IS8#TRPBF
1722I
8-Lead Plastic SO
–40°C to 85°C
LT1722CS5#PBF
LT1722CS5#TRPBF
LTZB
5-Lead Plastic TSOT-23
0°C to 70°C
LT1722IS5#PBF
LT1722IS5#TRPBF
LTZB
5-Lead Plastic TSOT-23
–40°C to 85°C
LT1723CS8#PBF
LT1723CS8#TRPBF
1723
8-Lead Plastic SO
0°C to 70°C
LT1723IS8#PBF
LT1723IS8#TRPBF
1723I
8-Lead Plastic SO
–40°C to 85°C
LT1723CMS8#PBF
LT1723CMS8#TRPBF
LTYC
8-Lead Plastic MSOP
0°C to 70°C
LT1723IMS8#PBF
LT1723IMS8#TRPBF
LTZA
8-Lead Plastic MSOP
–40°C to 85°C
LT1724CS#PBF
LT1724CS#TRPBF
LT1724CS
14-Lead Plastic SO
0°C to 70°C
LT1724IS#PBF
LT1724IS#TRPBF
LT1724IS
14-Lead Plastic SO
–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.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
172234fb
3
LT1722/LT1723/LT1724
ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = ±5V, VCM = 0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
VOS
Input Offset Voltage
(Note 6)
LT1722 SOT-23 and LT1723 MS8
IOS
MIN
TYP
MAX
UNITS
100
150
400
650
μV
μV
Input Offset Current
40
300
nA
IB
Input Bias Current
40
300
nA
en
Input Noise Voltage
in
Input Noise Current
f = 10kHz
RIN
Input Resistance
VCM = ±3.5V
Differential
CIN
Input Capacitance
f = 10kHz
Input Voltage Range +
Input Voltage Range –
5
3.5
3.8
nV/√Hz
1.2
pA/√Hz
35
50
MΩ
kΩ
2
pF
4
–4
–3.5
V
V
CMRR
Common Mode Rejection Ratio
VCM = ±3.5V
80
100
dB
PSRR
Power Supply Rejection Ratio
VS = ±2.3V to ± 5.5V
78
90
dB
AVOL
Large-Signal Voltage Gain
VOUT = ±3V, RL = 500Ω
VOUT = ±3V, RL = 150Ω
10
7
17
14
V/mV
V/mV
VOUT
Output Swing
RL = 500Ω, VIN = ±10mV
RL = 150Ω, VIN = ±10mV
±3.2
±3.1
±3.8
±3.4
IOUT
Output Current
VOUT = ± 3V, 10mV Overdrive
23
50
mA
ISC
Short-Circuit Current
VOUT = 0V, VIN = ±1V
35
90
mA
SR
Slew Rate
AV = –1, (Note 7)
45
70
V/μs
Full Power Bandwidth
3V Peak, (Note 8)
3.7
MHz
200
MHz
91
112
ns
ns
115
V
V
GBW
Gain Bandwidth
f = 200kHz
tS
Settling Time
AV = –1, 2V, 0.1%
AV = –1, 2V, 0.01%
tr, tf
Rise Time, Fall Time
AV = 1, 10% to 90%, VIN = 0.2VP-P, RL = 150Ω
6
ns
Overshoot
AV = 1, VIN = 0.2VP-P, RL = 150Ω, RF = 0Ω
15
%
Propagation Delay
50% VIN to 50% VOUT = 0.2VP-P, RL = 150Ω
3
ns
RO
Output Resistance
AV = 1, f = 1MHz
0.15
Ω
Channel Separation
VOUT = ±3V, RL = 150Ω
IS
Supply Current
Per Amplifier
82
90
dB
3.7
4.5
mA
250
350
550
800
μV
μV
TA = 25°C. VS = 5V, VCM = 2.5V, RL to 2.5V, unless otherwise noted.
VOS
Input Offset Voltage
IOS
Input Offset Current
20
300
nA
IB
Input Bias Current
20
300
nA
en
Input Noise Voltage
in
Input Noise Current
f = 10kHz
RIN
Input Resistance
VCM = 1.5V to 3.5V
Differential
CIN
Input Capacitance
Input Voltage Range +
Input Voltage Range –
(Note 6)
LT1722 SOT-23 and LT1723 MS8
f = 10kHz
5
3.5
4
nV/√Hz
1.1
pA/√Hz
32
55
MΩ
kΩ
2
pF
4
1
1.5
V
V
172234fb
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LT1722/LT1723/LT1724
ELECTRICAL CHARACTERISTICS
TA = 25°C. VS = 5V, VCM = 2.5V, RL to 2.5V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
CMRR
Common Mode Rejection Ratio
VCM = 1.5V to 3.5V
80
100
dB
AVOL
Large-Signal Voltage Gain
VOUT = 1.5V to 3.5V, RL = 500Ω
4
10
V/mV
VOUT
Output Swing+
Output Swing–
RL = 500Ω, VIN = ±10mV
RL = 500Ω, VIN = ±10mV
3.6
3.8
0.9
IOUT
Output Current
VOUT = 3.5V or 1.5V, 10mV Overdrive
10
20
mA
ISC
Short-Circuit Current
VOUT = 2.5V, VIN = ±1V
22
55
mA
SR
Slew Rate
AV = –1, (Note 7)
40
Full Power Bandwidth
1V Peak, (Note 8)
GBW
Gain Bandwidth (Note 10)
f = 200kHz
tr, tf
Rise Time, Fall Time
AV = 1, 10% to 90%, VIN = 0.2VP-P, RL = 500Ω
5
ns
Overshoot
AV = 1, VIN = 0.2VP-P, RL = 500Ω
16
%
RO
IS
Propagation Delay
50% VIN to 50% VOUT , 0.1V, RL = 500Ω
Output Resistance
AV = 1, f = 1MHz
Channel Separation
VOUT = 1.5V to 3.5V, RL = 500Ω
Supply Current
Per Amplifier
115
82
MAX
1.4
UNITS
V
V
70
V/µs
8.7
MHz
180
MHz
3
ns
0.19
Ω
90
dB
3.8
5
mA
The ● denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C. VS = ±5V, VCM = 0V,
unless otherwise noted. (Note 5)
SYMBOL PARAMETER
VOS
CONDITIONS
MIN
Input Offset Voltage
(Note 6)
LT1722 SOT-23 and LT1723 MS8
l
l
Input VOS Drift
(Note 9)
l
TYP
3
MAX
UNITS
700
850
μV
μV
7
μV/°C
IOS
Input Offset Current
l
350
nA
IB
Input Bias Current
l
350
nA
Input Voltage Range +
Input Voltage Range –
l
l
3.5
–3.5
V
V
CMRR
Common Mode Rejection Ratio
VCM = ±3.5V
l
75
PSRR
Power Supply Rejection Ratio
VS = ±2.3V to ±5.5V
l
76
dB
9
6
V/mV
V/mV
dB
AVOL
Large-Signal Voltage Gain
VOUT = ±3V, RL = 500Ω
VOUT = ±3V, RL = 150Ω
l
l
VOUT
Output Swing
RL = 500Ω, VIN = ±10mV
RL = 150Ω, VIN = ±10mV
l
l
±3.15
±3.05
IOUT
Output Current
VOUT = ±3V, 10mV Overdrive
l
22
ISC
Short-Circuit Current
VOUT = 0V, VIN = ±1V
l
30
mA
SR
Slew Rate
AV = –1, (Note 7)
l
35
V/μs
GBW
Gain Bandwidth
f = 200kHz
l
100
MHz
Channel Separation
VOUT = ±3V, RL = 150Ω
l
81
dB
Supply Current
Per Amplifier
l
IS
V
V
mA
5.45
mA
172234fb
5
LT1722/LT1723/LT1724
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the temperature range of
0°C ≤ TA ≤ 70°C. VS = 5V, VCM = 2.5V, RL to 2.5V, unless otherwise noted. (Note 5)
SYMBOL PARAMETER
VOS
IOS
IB
CONDITIONS
MIN
Input Offset Voltage
(Note 6)
LT1722 SOT-23 and LT1723 MS8
l
l
Input VOS Drift
(Note 9)
l
TYP
3
Input Offset Current
l
Input Bias Current
l
Input Voltage Range +
Input Voltage Range –
l
l
3.5
MAX
UNITS
850
950
μV
μV
7
μV/°C
350
nA
350
nA
1.5
V
V
CMRR
Common Mode Rejection Ratio
VCM = 1.5V to 3.5V
l
75
dB
AVOL
Large-Signal Voltage Gain
VOUT = 1.5V to 3.5V, RL = 500Ω
l
3
V/mV
VOUT
Output Swing+
Output Swing–
RL = 500Ω, VIN = ±10mV
RL = 500Ω, VIN = ±10mV
l
l
3.55
IOUT
Output Current
VOUT = 3.5V, or 1.5V, 10mV Overdrive
l
9
mA
ISC
Short-Circuit Current
VOUT = 2.5V, VIN = ±1V
l
11
mA
SR
Slew Rate
AV = –1, (Note 7)
l
30
V/μs
Gain Bandwidth (Note 10)
f = 200kHz
l
100
MHz
Channel Separation
VOUT = 1.5V to 3.5V, RL = 500Ω
l
81
dB
GBW
IS
1.45
l
Supply Current
V
V
5.95
mA
MAX
UNITS
900
1100
μV
μV
The l denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 85°C. VS = ± 5V, VCM = 0V,
unless otherwise noted. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
(Note 6)
LT1722 SOT-23 and LT1723 MS8
l
l
Input VOS Drift
(Note 9)
l
IOS
IB
MIN
TYP
3
Input Offset Current
l
Input Bias Current
l
Input Voltage Range +
Input Voltage Range –
l
l
3.5
10
μV/°C
400
nA
400
nA
–3.5
V
V
CMRR
Common Mode Rejection Ratio
VCM = ±3.5V
l
75
dB
PSRR
Power Supply Rejection Ratio
VS = ±2.0V to ±5.5V
l
75
dB
AVOL
Large-Signal Voltage Gain
VOUT = ±3V, RL = 500Ω
VOUT = ±3V, RL = 150Ω
l
l
8
5
V/mV
V/mV
VOUT
Output Swing
RL = 500Ω, VIN = ±10mV
RL = 150Ω, VIN = ±10mV
l
l
±3.1
±3.0
IOUT
Output Current
VOUT = ±3V, 10mV Overdrive
l
20
ISC
Short-Circuit Current
VOUT = 0V, VIN = ±1V
l
25
mA
SR
Slew Rate
AV = –1, (Note 7)
l
25
V/μs
GBW
Gain Bandwidth
f = 200kHz
l
90
MHz
VOUT = ±3V, RL = 150Ω
l
80
Channel Separation
IS
Supply Current
l
V
V
mA
dB
5.95
mA
172234fb
6
LT1722/LT1723/LT1724
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the temperature range of
–40°C ≤ TA ≤ 85°C. VS = 5V, VCM = 2.5V, RL to 2.5V, unless otherwise noted. (Note 5)
SYMBOL PARAMETER
CONDITIONS
MIN
VOS
Input Offset Voltage
(Note 6)
LT1722 SOT-23 and LT1723 MS8
l
l
Input VOS Drift
(Note 9)
l
TYP
3
MAX
UNITS
1000
1200
µV
µV
10
μV/°C
IOS
Input Offset Current
l
400
nA
IB
Input Bias Current
l
400
nA
Input Voltage Range +
Input Voltage Range –
l
l
3.5
1.5
V
V
CMRR
Common Mode Rejection Ratio
VCM = 1.5V to 3.5V
l
75
dB
AVOL
Large-Signal Voltage Gain
VOUT = 1.5V to 3.5V, RL = 500Ω
l
2
V/mV
VOUT
Output Swing+
Output Swing–
RL = 500Ω, VIN = ±10mV
RL = 500Ω, VIN = ±10mV
l
l
3.5
IOUT
Output Current
VOUT = 3.5V or 1.5V, 30mV Overdrive
l
8
1.5
V
V
mA
ISC
Short-Circuit Current
VOUT = 2.5V, VIN = ±1V
l
10
mA
SR
Slew Rate
AV = –1, (Note 7)
l
20
V/μs
GBW
Gain Bandwidth (Note 10)
f = 200kHz
l
90
MHz
Channel Separation
VOUT = 1.5V to 3.5V, RL = 500Ω
l
80
dB
IS
Supply Current
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. If the differential
input voltage exceeds 0.7V, the input current should be limited to less than
10mA.
Note 3: A heat sink may be required to keep the junction temperature
below the absolute maximum rating when the output is shorted
indefinitely.
Note 4: The LT1722C/LT1722I, LT1723C/LT1723I, LT1724C/LT1724I are
guaranteed functional over the operating temperature range of
–40°C to 85°C.
Note 5: The LT1722C/LT1723C/LT1724C are guaranteed to meet specified
performance from 0°C to 70°C. The LT1722C/LT1723C/LT1724C are
l
6.45
mA
designed, characterized and expected to meet specified performance from
–40°C to 85°C but are not tested or QA sampled at these temperatures.
The LT1722I/LT1723I/LT1724I are guaranteed to meet specified
performance from –40°C to 85°C.
Note 6: Input offset voltage is pulse tested and is exclusive of warm-up
drift.
Note 7: Slew rate is measured between ±2V on the output with ±3V input
for ±5V supplies and ±1V on the output with ±1.5V input for single 5V
supply. (For 5V supply, the voltage levels are 2.5V referred.)
Note 8: Full power bandwidth is calculated from the slew rate:
FPBW = SR/2πVP
Note 9 : This parameter is not 100% tested.
Note 10 : This parameter is guaranteed through correlation with slew rate.
172234fb
7
LT1722/LT1723/LT1724
TYPICAL PERFORMANCE CHARACTERISTICS
Input Common Mode Range
vs Supply Voltage
Supply Current vs Temperature
0.5
PER AMPLIFIER
VS = ±5V
3.5
3.0
2.5
INPUT BIAS CURRENT (nA)
VS = 5V
–1.0
–1.5
–1.2
TA = 25°C
(VOS) < 500μV
2.0
1.5
1.0
V–
50
25
75
0
TEMPERATURE (°C)
100
125
1
3
2
5
4
SUPPLY VOLTAGE (±V)
INPUT VOLTAGE NOISE (nV/√Hz)
INPUT BIAS CURRENT (nA)
IB
IB+
–20
IB–
IB+
–40
–200
–5 –4 –3 –2 –1 0 1 2 3 4
INPUT COMMON MODE VOLTAGE (V)
Open-Loop Gain
vs Resistive Load
10
in
10
5
1723 G03
1
en
89.0
INPUT CURRENT NOISE (pA/√Hz)
–
TA = 125°C
–100
7
6
100
VS = 5V
TA = –45°C
0
Input Noise Spectral Density
60
0
100
1723 G02
Input Bias Current
vs Temperature
20
TA = 25°C
–400
0
1723 G01
40
TA = 85°C
200
–300
0.5
2.0
–50 –25
VS = ±5V
300
–0.5
TA = 25°C
86.5
OPEN-LOOP GAIN (dB)
SUPPLY CURRENT (mA)
4.5
4.0
400
V+
INPUT COMMON MODE RANGE (V)
5.0
Input Bias Current
vs Common Mode Voltage
VS = ±5V, VO = ±3V
84.0
81.5
VS = ±2.5V, VO = ±1V
79.0
76.5
VS = ±5V
50
25
75
0
TEMPERATURE (°C)
100
1
0.01
125
0.1
Total Noise
vs Unmatched Source Resistance
TOTAL NOISE
RESISTOR NOISE
1
RS
0.1
0.01
+
–
OFFSET VOLTAGE DRIFT (μV)
TOTAL NOISE VOLTAGE (nV/√Hz)
10
LT1722S8
TA = 25°C
TYPICAL DATA
25
100
1723 G07
TA = 25°C
TYPICAL PART
VS = ±6.3V
200
VS = ±6V
VS = ±5V
20
10000
VOS Shift vs VCM and VS
300
15
VS = ±2.5V
10
100 V = ±5V
S
0
–100
5
VS = ±4V
VS = ±3V
VS = ±2.5V
–200
0
0.1
1
10
SOURCE RESISTANCE, RS (kΩ)
1000
LOAD RESISTANCE (Ω)
1723 G06
Warm-Up Drift vs Time
30
VS = ±5V
TA = 25°C
f = 10kHz
74.0
100
1723 G05
1723 G04
100
0.1
100
1
10
FREQUENCY (kHz)
VOS SHIFT (μV)
–60
–50 –25
–300
0
10 20 30 40 50 60 70 80 90 100
TIME AFTER POWER-UP (SEC)
1723 G08
–5 –4 –3 –2 –1 0 1 2 3
COMMON MODE VOLTAGE (V)
4
5
1723 G09
172234fb
8
LT1722/LT1723/LT1724
TYPICAL PERFORMANCE CHARACTERISTICS
Undistorted Output Swing
vs Frequency
VOS vs Temperature
OUTPUT VOLTAGE (VP-P)
0
VS = ±5V
–100
–200
VS = ±2.5V
–300
5.0
9
4.5
8 AV = 1, RF = 0Ω, RIN = 500Ω
7
6
5
4
3
2
–400
1
–500
–60 –40 –20
AV = –1, RF = 500Ω
0
0.1
0 20 40 60 80 100 120
TEMPERATURE (°C)
V+
85
–0.5
OUTPUT VOLTAGE SWING (V)
OPEN-LOOP GAIN (dB)
RL = 500Ω
RL = 150Ω
82
81
80
VS = 5V, VO = ±1V
79
RL = 500Ω
78
1
FREQUENCY (MHz)
RL = 500Ω
RL = 150Ω
2.0
RL = 150Ω
1.5
1.0
76
–50
125
RL = 500Ω
2.0
2.5
3.0 3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (±V)
Gain and Phase vs Frequency
±5V
5V
5V
50
80
80
75
40
40
30
30
20
20
10
0
TA = 25°C
AV = –1
RF = RG = 500Ω
–10
0.01
0.1
1
10
FREQUENCY (MHz)
65
60
50
GAIN
70
70
10
PHASE (DEG)
GAIN (dB)
60
90
OVERSHOOT (%)
70
5.5
105
100
90
80
SOURCE
75
VS = 5V
70
SINK
65
–25
50
25
0
75
TEMPERATURE (°C)
Output Impedance vs Frequency
VS = ±5V
RL = 500Ω
VIN = 2VP-P
f = 1MHz
55
AV = 1, RF = 500Ω,
RS = 0Ω
50
45
AV = –1, RF = 500Ω, RS = 0Ω
40
35
25
20
TA = 25°C
VS = ±5V
10
AV = 100
AV = 10
1
AV = 1
0.1
0.01
30
–10
100
125
100
1723 G15
100
60
0
1723 G16
SINK
85
60
–50
6.0
SOURCE
VS = ±5V
95
Overshoot vs Capacitive Load
PHASE
±5V
80
10
1723 G12
1723 G08
1723 G13
90
1
FREQUENCY (MHz)
110
–2.0
V–
100
AV = –1, RF = 500Ω
1.5
Output Short-Circuit Current
vs Temperature
–1.5
0.5
50
25
0
75
TEMPERATURE (°C)
2.0
0
0.1
10
TA = 25°C
VIN = 10mV
–1.0
77
–25
2.5
Output Voltage Swing
vs Supply Voltage
86
83
AV = 1, RF = 0Ω,
RIN = 500Ω
3.0
1723 G11
Open-Loop Gain vs Temperature
84
3.5
0.5
1723 G10
VS = ±5V, VO = ±3V
4.0
VS = 5V
RL = 500Ω
2% MAX DISTORTION
1.0
VS = ±5V
RL = 150Ω
2% MAX DISTORTION
OUTPUT SHORT-CIRCIUT CURRENT (mA)
OFFSET VOLTAGE (μV)
100
10
OUTPUT VOLTAGE (VP-P)
TYPICAL PART
OUTPUT IMPEDANCE (Ω)
200
Undistorted Output Swing
vs Frequency
AV = 1, RF = 0Ω, RS = 500Ω
0.001
10
20
30
40 50 60 70 80
CAPACITIVE LOAD (pF)
90 100
1723 G17
0.01 0.1
1
10
FREQUENCY (MHz)
100
1723 G18
172234fb
9
LT1722/LT1723/LT1724
TYPICAL PERFORMANCE CHARACTERISTICS
Gain vs Frequency, AV = 1
TA = 25°C
AV = 1
RF = 0Ω
NO RL
±5V
5V
8
7
7
6
CL = 100pF
5
4
3
CL = 50pF
2
Gain vs Frequency, AV = –1
9
TA = 25°C
AV = 1
NO RL
NO CL
±5V
5V
8
GAIN (dB)
6
5
RF = 500Ω
4
3
CL = 0pF
0
10
FREQUENCY (MHz)
1
10
FREQUENCY (MHz)
1
POWER SUPPLY REJECTION RATIO (dB)
CROSSTALK (dB)
–40
–50
–60
–70
–80
–90
0.1
1
10
FREQUENCY (MHz)
–PSRR
80
60
50
40
30
20
10
0.1
1
10
FREQUENCY (MHz)
100
80
90
75
VS = ±5V, SR+
70
PHASE MARGIN (DEG)
SLEW RATE (V/μs)
VS = ±5V, SR–
VS = ±2.5V, SR–
50
40
30
0
50
75
25
TEMPERATURE (°C)
80
70
60
50
40
30
20
10
0.01
100
125
1723 G40
1
10
FREQUENCY (MHz)
100
1723 G24
220
TA = 25°C
AV = –1
VIN = –20dBm
RG = RF = 500Ω
215
RL = 500Ω
65
60
55
CL = 5pF
CL = 25pF
50
40
100
0.1
Gain Bandwidth
vs Supply Voltage
RL = 500Ω
RL = 150Ω
RL = 150Ω
RL = 150Ω
45
TA = 25°C
AV = –1
RG = RF = 500Ω
20
–50 –25
90
Phase Margin vs Supply Voltage
70
TA = 25°C
VS = ±5V
100
1723 G23
Slew Rate vs Temperature
60
110
+PSRR
70
1723 G22
VS = ±2.5V, SR+
Common Mode Rejection Ratio
vs Frequency
TA = 25°C
VS = ±5V
AV = 1
90
0
0.01
100
80
100
1723 G21
Power Supply Rejection Ratio
vs Frequency
100
–30
10
FREQUENCY (MHz)
1
100
1723 G20
Channel Separation vs Frequency
–20
CL = 0pF
0
1723 G19
TA = 25°C
VO = 6VP-P
RL = 150Ω
3
–1
–1
100
CL = 50pF
4
1
RF = 0Ω
COMMON MODE REJECTION RATIO (dB)
0
5
CL = 100pF
2
1
–1
–10
7
2
1
TA = 25°C
AV = –1
RF = RG = 500Ω
NO RL
±5V
5V
8
RF = 1k
GAIN BANDWIDTH (MHz)
GAIN (dB)
6
Gain vs Frequency, AV = 1
9
GAIN (dB)
9
CL = 55pF
3
3.5
4
4.5
5
SUPPLY VOLTAGE (±V)
5.5
6
1723 G41
RL = 150Ω
CL = 25pF
205
200
CL = 5pF
195
CL = 55pF
CL = 25pF
190
185
RL = 500Ω
35
2.5
210
TA = 25°C
AV = –1
VIN = –20dBm
RG = RF = 500Ω
CL = 5pF
RL = 500Ω
180
2.5
3
CL = 55pF
5
4.5
4
SUPPLY VOLTAGE (±V)
3.5
5.5
6
1723 G42
172234fb
10
LT1722/LT1723/LT1724
TYPICAL PERFORMANCE CHARACTERISTICS
Harmonic Distortion vs Frequency
AV = 1, VO = 0.2VP-P
VIN_P-P = VS, VOUT_MES
AT 2/3 OF VIN_P-P
70
SR+
65
SR–
60
VIN = ±1.5V, VOUT_MES AT ±1V
TA = 25°C
AV = –1
RF = RG = RL = 500Ω
55
50
2.5
2
6
–50
–60
–70
RL = 150Ω, 3RD
–80
RL = 150Ω, 2ND
RL = 500Ω, 2ND
–90
RL = 500Ω, 3RD
–100
6.5
–50
–60
VS = 5V
AV = 1
RF = 0Ω
RIN = 0Ω
VO = 0.2VP-P
RL = 500Ω, 3RD
–70
RL = 150Ω, 3RD
–80
RL = 150Ω, 2ND
RL = 500Ω, 2ND
–90
–100
1
FREQUENCY (MHz)
0.1
10
1
FREQUENCY (MHz)
0.1
10
1723 G25
1723 G26
1723 G27
Harmonic Distortion vs Frequency
AV = 2, VO = 0.2VP-P
Harmonic Distortion vs Frequency
AV = 2, VO = 0.2VP-P
Harmonic Distortion vs Frequency
AV = 1, VO = 2VP-P
–40
–60
RL = 150Ω, 3RD
–70
RL = 150Ω, 2ND
–80
RL = 500Ω, 3RD
–90
RL = 500Ω, 2ND
–100
0.1
–50
–60
RL = 150Ω, 3RD
–70
RL = 150Ω, 2ND
–80
RL = 500Ω, 3RD
–90
RL = 500Ω, 2ND
–100
1
FREQUENCY (MHz)
10
–40
VS = 5V
AV = 2
RF = 500Ω
VO = 0.2VP-P
10
–60
–70
RL = 150Ω, 2ND
–70
RL = 150Ω, 2ND
RL = 150Ω, 3RD
–80
RL = 500Ω, 3RD
RL = 500Ω, 2ND
–90
1
FREQUENCY (MHz)
0.1
RL = 500Ω, 3RD
RL = 500Ω, 2ND
–90
10
1723 G30
Harmonic Distortion vs Frequency
AV = 2, VO = 2VP-P
–40
VS = 5V
AV = 1
RF = 0Ω
RIN = 500Ω
VO = 2VP-P
RL = 150Ω, 3RD
–80
–60
1723 G29
Harmonic Distortion vs Frequency
AV = 1, VO = 2VP-P
–50
–50
VS = ±5V
AV = 1
RF = 0Ω
RIN = 500Ω
VO = 2VP-P
–100
1
FREQUENCY (MHz)
0.1
1723 G28
–40
HARMONIC DISTORTION (dBc)
VS = ±5V
AV = 2
RF = 500Ω
VO = 0.2VP-P
HARMONIC DISTORTION (dBc)
–50
3.5 4 4.5 5 5.5
SUPPLY VOLTAGE (±V)
HARMONIC DISTORTION (dBc)
HARMONIC DISTORTION (dBc)
–40
3
–40
VS = ±5V
AV = 1
RF = 0Ω
RIN = 0Ω
VO = 0.2VP-P
SR
SR–
HARMONIC DISTORTION (dBc)
SLEW RATE (V/μs)
75
–40
+
HARMONIC DISTORTION (dBc)
80
Harmonic Distortion vs Frequency
AV = 1, VO = 0.2VP-P
HARMONIC DISTORTION (dBc)
Slew Rate vs Supply Voltage
–50
VS = ±5V
AV = 2
RF = 500Ω
VO = 2VP-P
–60
RL = 150Ω, 2ND
RL = 150Ω, 3RD
–70
RL = 500Ω, 2ND
–80
–90
RL = 500Ω, 3RD
–100
–100
0.1
1
FREQUENCY (MHz)
10
1723 G31
0.1
1
FREQUENCY (MHz)
10
1723 G32
172234fb
11
LT1722/LT1723/LT1724
TYPICAL PERFORMANCE CHARACTERISTICS
Harmonic Distortion vs Frequency
AV = 2, VO = 2VP-P
–50
–60
Settling Time vs Output Step
3.0
2.5
VS = 5V
AV = 2
RF = 500Ω
VO = 2VP-P
2.0
OUTPUT STEP (V)
HARMONIC DISTORTION (dBc)
–40
RL = 150Ω, 3RD
RL = 150Ω, 2ND
–70
–80
RL = 500Ω, 2ND
1.5
1.0
0.01% SETTLING
0.5
VS = ±5V
AV = –1
RF = 500Ω
CF = 0pF
0
–0.5
–1.0
0.01% SETTLING
–1.5
RL = 500Ω, 3RD
–2.0
–90
0.1% SETTLING
–2.5
–100
0.1
0.1% SETTLING
1
FREQUENCY (MHz)
–3.0
10
70
60
80
90 100 110 120 130 140
SETTLING TIME (ns)
1723 G33
Large-Signal Transient, AV = 1
1723 G43
Small-Signal Transient, AV = 1
Small-Signal Transient, AV = 1
50mV/DIV
50mV/DIV
1V/DIV
AV = 1
RS = 500Ω
RF = 0Ω
50ns/DIV
AV = 1
RS = 0Ω
RF = 0Ω
CL = 0pF
1723 G34
Large-Signal Transient, AV = –1
50ns/DIV
AV = –1
RG = 500Ω
RF = 500Ω
50ns/DIV
1723 G37
50ns/DIV
1723 G36
Small-Signal Transient, AV = –1
Small-Signal Transient, AV = –1
50mV/DIV
1V/DIV
AV = 1
RS = 0Ω
RF = 0Ω
CL = 100pF
1723 G35
50mV/DIV
AV = –1
RG = 500Ω
RF = 500Ω
CL = 0pF
50ns/DIV
1723 G38
AV = –1
RG = 500Ω
RF = 500Ω
CL = 100pF
50ns/DIV
1723 G39
172234fb
12
LT1722/LT1723/LT1724
APPLICATIONS INFORMATION
The LT1722/LT1723/LT1724 may be inserted directly into
many operational amplifier applications improving both DC
and AC performance, as well as noise and distortion.
VS+
The parallel combination of the feedback resistor and gain
setting resistor on the inverting input combine with the
input capacitance to form a pole that can cause peaking
or even oscillations. In parallel with the feedback resistor,
a capacitor of value:
CF > RG • CIN/RF
should be used to cancel the input pole and optimize
dynamic performance. For unity-gain applications where
a feedback resistor is used, such as an I-to-V converter,
CF should be five times greater than CIN; an optimum
value for CF is 10pF.
Input Considerations
Each of the LT1722/LT1723/LT1724 inputs is protected with
back-to-back diodes across the bases of the NPN input
devices. If greater than 0.7V differential input voltages are
anticipated, the input current must be limited to less than
10mA with an external series resistor. Each input also has
two ESD clamp diodes—one to each supply. If an input is
driven beyond the supply, limit the current with an external
resistor to less than 10mA. The input stage protection
circuit is shown in Figure 1.
The input currents of the LT1722/LT1723/LT1724 are
typically in the tens of nA range due to the bias current
cancellation technique used at the input. As the input
offset current can be greater than either input current,
+IN
Q2
Q1
+IN
Layout and Passive Components
The LT1722/LT1723/LT1724 amplifiers are more tolerant
of less than ideal layouts than other high speed amplifiers.
For maximum performance (for example, fast settling time)
use a ground plane, short lead lengths and RF quality
bypass capacitors (0.01μF to 0.1μF). For high drive current
applications, use low ESR supply bypass capacitors (1μF
to 10μF tantalum). The output/input parasitic coupling
should be minimized when high frequency performance
is required.
D1
D3
REXT
D2
R
D4
I1
VS–
D5
–IN
REXT
–IN
D6
I2
1723 F01
Figure 1. Input Stage Protection
adding resistance to balance source resistance is not
recommended. The value of the source resistor should
be below 12k as it actually degrades DC accuracy and
also increases noise.
Total Input Noise
The total input noise of the LT1722/LT1723/LT1724 is
optimized for a source resistance between 0.8k and 12k.
Within this range, the total input noise is dominated by
the noise of the source resistance itself. When the source
resistance is below 0.8k, voltage noise of the amplifier
dominates. When the source resistance is above 12k, the
input noise current is the dominant contributor.
Capacitive Loading
The LT1722/LT1723/LT1724 drive capacitive loads up to
100pF with unity gain. As the capacitive load increases,
both the bandwidth and the phase margin decrease causing
peaking in the frequency response and overshoot in the
transient response. When there is a need to drive a larger
capacitive load, a 25Ω series resistance assures stability
with any value of load capacitor. A feedback capacitor also
helps to reduce any peaking.
Power Dissipation
The LT1722/LT1723/LT1724 combine high speed and
large output drive in a small package. Maximum junction
temperature (TJ) is calculated from the ambient temperature
(TA), power dissipation per amplifier (PD) and number of
amplifiers (n) as follows:
TJ = TA + (n • PD • θJA)
172234fb
13
LT1722/LT1723/LT1724
APPLICATIONS INFORMATION
Power dissipation is composed of two parts. The first is
due to the quiescent supply current and the second is due
to on-chip dissipation caused by the load current.
Worst-case instantaneous power dissipation for a given
resistive load in one amplifier occurs at the maximum
supply current and when the output voltage is at half of
either supply voltage (or the maximum swing if less than
half supply voltage).
Therefore PD(MAX) in one amplifier is:
PD(MAX) = (V+ – V–)(IS(MAX)) + (V+/2)2/RL
or
PD(MAX) = (V+ – V–)(IS(MAX)) +
(V+ – VO(MAX))(VO(MAX)/RL)
Example. Worst-case conditions are: both op amps in
the LT1723IS8 are at TA = 85°C, VS = ±5V, RL = 150Ω,
VOUT = 2.5V.
Circuit Operation
The LT1722/LT1723/LT1724 circuit topology is a voltage
feedback amplifier. The operation of the circuit can be
understood by referring to the Simplified Schematic. The
first stage is a folded cascode formed by the transistors
Q1 through Q4. A degeneration resistor, R, is used in the
input stage. The current mirror Q5, Q6 is bootstrapped
by Q7. The capacitor, C, assures the bandwidth and the
slew rate performance. The output stage is formed by
complementary emitter followers, Q8 through Q11. The
diodes D1 and D2 protect against input reversed biasing.
The remaining part of the circuit assures optimum voltage
and current biases for all stages.
Low noise, reduced current supply, high speed and
DC accurate parameters are distinctive features of the
LT1722/LT1723/LT1724.
PD(MAX) = 2 •[(10V)(5.95mA) + (2.5V)2/150Ω] = 203mW
TJ(MAX) = 85°C + (203mW)(190°C/W) = 124°C
which is less than the absolute maximum rating at 150°C.
SIMPLIFIED SCHEMATIC
VS+
R1
R2
I5
Q3
Q4
VBIAS
C
D1
+IN
Q1
Q10
Q2
?–IN
D2
R
Q7
Q5
Q6
Q8
OUT
Q9
Q11
I1
I2
I3
I4
1723 SS
VS–
172234fb
14
LT1722/LT1723/LT1724
PACKAGE DESCRIPTION
S5 Package
5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635)
0.62
MAX
0.95
REF
2.90 BSC
(NOTE 4)
1.22 REF
1.4 MIN
3.85 MAX 2.62 REF
2.80 BSC
1.50 – 1.75
(NOTE 4)
PIN ONE
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
0.01 – 0.10
1.00 MAX
DATUM ‘A’
0.30 – 0.50 REF
0.09 – 0.20
(NOTE 3)
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
1.90 BSC
S5 TSOT-23 0302 REV B
172234fb
15
LT1722/LT1723/LT1724
PACKAGE DESCRIPTION
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
NOTE 3
.045 ±.005
.050 BSC
8
.245
MIN
7
6
5
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 ±.005
TYP
1
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
s 45°
(0.254 – 0.508)
.008 – .010
(0.203 – 0.254)
2
3
4
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
1. DIMENSIONS IN
INCHES
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
SO8 0303
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660 Rev F)
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
0.889 ± 0.127
(.035 ± .005)
5.23
(.206)
MIN
0.42 ± 0.038
(.0165 ± .0015)
TYP
3.20 – 3.45
(.126 – .136)
0.65
(.0256)
BSC
0.254
(.010)
8
7 6 5
3.00 ± 0.102
(.118 ± .004)
(NOTE 4)
4.90 ± 0.152
(.193 ± .006)
DETAIL “A”
0.52
(.0205)
REF
0° – 6° TYP
GAUGE PLANE
1
0.53 ± 0.152
(.021 ± .006)
RECOMMENDED SOLDER PAD LAYOUT
DETAIL “A”
1.10
(.043)
MAX
2 3
4
0.86
(.034)
REF
0.18
(.007)
SEATING
PLANE
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.22 – 0.38
(.009 – .015)
TYP
0.65
(.0256)
BSC
0.1016 ± 0.0508
(.004 ± .002)
MSOP (MS8) 0307 REV F
172234fb
16
LT1722/LT1723/LT1724
PACKAGE DESCRIPTION
S Package
14-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.337 – .344
(8.560 – 8.738)
NOTE 3
.045 ±.005
.050 BSC
14
N
12
11
10
9
8
N
.245
MIN
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
1
.030 ±.005
TYP
13
2
3
N/2
N/2
RECOMMENDED SOLDER PAD LAYOUT
1
.010 – .020
s 45°
(0.254 – 0.508)
.008 – .010
(0.203 – 0.254)
2
3
4
5
6
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
0° – 8° TYP
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
.014 – .019
(0.355 – 0.483)
TYP
7
.050
(1.270)
BSC
INCHES
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
S14 0502
172234fb
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
17
LT1722/LT1723/LT1724
TYPICAL APPLICATION
4- to 2-Wire Local Echo Cancellation Differential Receiver Amplifier
–
10pF
2k
1/2 LT1739
+
1k
50Ω
1k
–
1/2 LT1723
(n = 1)
n:1
VD
LINE
DRIVER
•
VL
100Ω
LINE
+
•R
VR
LINE
RECEIVER
L
n2
+
1/2 LT1723
–
+
50Ω
1k
1k
1/2 LT1739
–
2k
1723 TA03
10pF
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1677
Single, Low Noise Rail-to-Rail Amplifier
3V Operation, 2.5mA Supply Current, 4.5nV/√Hz Max en,
60µV Max VOS
LT1800/LT1801/LT1802
Single/Dual/Quad, Low Power, 80MHz Rail-to-Rail
Precision Amplifier
1.6mA Supply Current, 350µV VOS, 2.3V Operation
LT1806/LT1807
Single/Dual, Low Noise 325MHz Rail-to-Rail Amplifiers
2.5V Operation, 550µVMAX VOS, 3.5nV/√Hz
LT1809/LT1810
Single/Dual, Low Distortion 180MHz Rail-to-Rail Amplifiers
2.5V Operation, –90dBc at 5MHz Distortion
LT1812/LT1813/LT1814
Single/Dual/Quad, 3mA, 750V/µs Amplifiers
5V Operation, 3.6mA Supply Current, 40mA Min Output Current
LT6202/LT6203/LT6204
Single/Dual/Quad, 100MHz, Low Noise Rail-to-Rail Op Amps 2nV/√Hz, 2.5mA on Single 3V Supply
172234fb
18 Linear Technology Corporation
LT 0909 REV B • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
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