LINER LT6231CS8 215mhz, rail-to-rail output, 1.1nv/ root hz, 3.5ma op amp family Datasheet

LT6230/LT6230-10/
LT6231/LT6232
215MHz, Rail-to-Rail Output,
1.1nV/√Hz, 3.5mA Op Amp Family
U
DESCRIPTIO
FEATURES
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Low Noise Voltage: 1.1nV/√Hz
Low Supply Current: 3.5mA/Amp Max
Low Offset Voltage: 350µV Max
Gain Bandwidth Product:
LT6230: 215MHz; AV ≥ 1
LT6230-10: 1450MHz; AV ≥ 10
Wide Supply Range: 3V to 12.6V
Output Swings Rail-to-Rail
Common Mode Rejection Ratio 115dB Typ
Output Current: 30mA
Operating Temperature Range – 40°C to 85°C
LT6230 Shutdown to 10µA Maximum
LT6230/LT6230-10 in SOT-23 Package
Dual LT6231 in 8-Pin SO and Tiny DFN Packages
LT6232 in 16-Pin SSOP Package
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APPLICATIO S
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Ultrasound Amplifiers
Low Noise, Low Power Signal Processing
Active Filters
Driving A/D Converters
Rail-to-Rail Buffer Amplifiers
, LTC and LT are registered trademarks of Linear Technology Corporation.
The LT®6230/LT6231/LT6232 are single/dual/quad low
noise, rail-to-rail output unity gain stable op amps that
feature 1.1nV/√Hz noise voltage and draw only 3.5mA of
supply current per amplifier. These amplifiers combine
very low noise and supply current with a 215MHz gain
bandwidth product, a 70V/µs slew rate and are optimized
for low supply voltage signal conditioning systems. The
LT6230-10 is a single amplifier optimized for higher gain
applications resulting in higher gain bandwidth and slew
rate. The LT6230 and LT6230-10 include an enable pin
that can be used to reduce the supply current to less than
10µA.
The amplifier family has an output that swings within
50mV of either supply rail to maximize the signal dynamic
range in low supply applications and is specified on 3.3V,
5V and ±5V supplies. The en • √ISUPPLY product of 1.9 per
amplifier is among the most noise efficient of any op amp.
The LT6230/LT6230-10 is available in the 6-lead SOT-23
package and the LT6231 dual is available in the 8-pin SO
package with standard pinouts. For compact layouts, the
dual is also available in a tiny dual fine pitch leadless
package (DFN). The LT6232 is available in the 16-pin
SSOP package.
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TYPICAL APPLICATIO
Noise Voltage and Unbalanced
Noise Current vs Frequency
Low Noise Low Power Instrumentation Amplifier
VS+
R4
499Ω
+
6
R6
499Ω
–
VS+
R2
196Ω
+
R1
10Ω
LT6202
VOUT
–
R3
196Ω
–
R5
499Ω
VS–
R7
499Ω
+
VS–
5
4
4
3
3
NOISE CURRENT
2
2
1
1/2 LT6231
IN–
NOISE VOLTAGE (nV/√Hz)
1/2 LT6231
6
VS = ±2.5V
TA = 25°C
VCM = 0V
5
AV = 40
BW = 5.1MHz
VS = ±1.5V to ±5V
IS = 10mA
EN = 5.8µVRMS INPUT REFERRED,
MEASUREMENT BW = 8MHz
623012 TA01a
0
NOISE VOLTAGE
10
100
1k
10k
FREQUENCY (Hz)
1
UNBALANCED NOISE CURRENT (pA/√Hz)
IN+
0
100k
623012 TA01b
sn623012 623012fas
1
LT6230/LT6230-10/
LT6231/LT6232
U
W W
W
ABSOLUTE
AXI U RATI GS (Note 1)
Total Supply Voltage (V+ to V–) ............................ 12.6V
Input Current (Note 2) ........................................ ±40mA
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
Junction Temperature ........................................... 150°C
Junction Temperature (DD Package) ................... 125°C
Storage Temperature Range ..................–65°C to 150°C
Storage Temperature Range
(DD Package) ...................................... – 65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
U
W
U
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
–
V 2
5 ENABLE
+IN 3
4 –IN
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 150°C, θJA = 250°C/W
S6 PART
MARKING*
LTAFJ
LTAFK
ORDER PART
NUMBER
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
V– 4
–
+
–
+
8
V+
7
OUT B
6
–IN B
5
+IN B
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 200°C/W
LT6231CS8
LT6231IS8
OUT A
1
–IN A
2
+IN A
3
V–
4
6231
6231I
–
+
V+
7
OUT B
6
–IN B
5
+IN B
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 160°C/W
UNDERSIDE METAL CONNECTED TO V–
(PCB CONNECTION OPTIONAL)
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
V
+
16
–
+
A
–IN B 6
OUT B 7
NC 8
OUT D
15 –IN D
14 +IN D
D
4
+IN B 5
S8 PART
MARKING
–
+
8
–
6 V+
OUT 1
LT6230CS6
LT6230IS6
LT6230CS6-10
LT6230IS6-10
TOP VIEW
+
TOP VIEW
ORDER PART
NUMBER
13 V
+
–B
+
C–
–
LT6231CDD
LT6231IDD
DD PART
MARKING*
LAEU
ORDER PART
NUMBER
LT6232CGN
LT6232IGN
12 +IN C
11 –IN C
10 OUT C
9
GN PART
MARKING
NC
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
TJMAX = 150°C, θJA = 135°C/W
6232
6232I
*The temperature grade is identified by a label on the shipping container.Consult LTC Marketing for parts specified with wider operating temperature ranges.
sn623012 623012fas
2
LT6230/LT6230-10/
LT6231/LT6232
ELECTRICAL CHARACTERISTICS
ENABLE = 0V, unless otherwise noted.
TA = 25°C, VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply,
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
LT6230S6, LT6230S6-10
LT6231S8, LT6232GN
LT6231DD
MIN
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
IB
IOS
TYP
MAX
UNITS
100
50
75
500
350
450
µV
µV
µV
100
600
µV
5
10
µA
IB Match (Channel-to-Channel) (Note 6)
0.1
0.9
µA
Input Offset Current
0.1
0.6
µA
1.7
nV/√Hz
Input Bias Current
Input Noise Voltage
0.1Hz to 10Hz
180
en
Input Noise Voltage Density
f = 10kHz, VS = 5V
1.1
nVP-P
in
Input Noise Current Density, Balanced Source
Unbalanced Source
f = 10kHz, VS = 5V, RS = 10k
f = 10kHz, VS = 5V, RS = 10k
1
2.4
pA/√Hz
pA/√Hz
Input Resistance
Common Mode
Differential Mode
6.5
7.5
MΩ
kΩ
CIN
Input Capacitance
Common Mode
Differential Mode
2.9
7.7
pF
pF
AVOL
Large-Signal Gain
VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS/2
RL = 1k to VS/2
VO = 1V to 4V,
RL = 100Ω to VS/2
105
21
5.4
200
40
9
V/mV
V/mV
V/mV
VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS/2
RL = 1k to VS/2
90
16.5
175
32
V/mV
V/mV
1.5
1.15
VCM
Input Voltage Range
Guaranteed by CMRR, VS = 5V, 0V
VS = 3.3V, 0V
CMRR
Common Mode Rejection Ratio
VS = 5V, VCM = 1.5V to 4V
VS = 3.3V, VCM = 1.15V to 2.65V
90
90
115
115
dB
dB
CMRR Match (Channel-to-Channel) (Note 6)
VS = 5V, VCM = 1.5V to 4V
84
120
dB
Power Supply Rejection Ratio
VS = 3V to 10V
90
115
dB
PSRR Match (Channel-to-Channel) (Note 6)
VS = 3V to 10V
84
115
dB
PSRR
Minimum Supply Voltage (Note 7)
4
2.65
3
V
V
V
VOL
Output Voltage Swing LOW (Note 8)
No Load
ISINK = 5mA
VS = 5V, ISINK = 20mA
VS = 3.3V, ISINK = 15mA
4
85
240
185
40
190
460
350
mV
mV
mV
mV
VOH
Output Voltage Swing HIGH (Note 8)
No Load
ISOURCE = 5mA
VS = 5V, ISOURCE = 20mA
VS = 3.3V, ISOURCE = 15mA
5
90
325
250
50
200
600
400
mV
mV
mV
mV
ISC
Short-Circuit Current
VS = 5V
VS = 3.3V
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
ENABLE = V+ – 0.35V
±30
±25
±45
±40
3.15
0.2
mA
mA
3.5
10
mA
µA
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3
LT6230/LT6230-10/
LT6231/LT6232
ELECTRICAL CHARACTERISTICS
ENABLE = 0V, unless otherwise noted.
TA = 25°C, VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply,
SYMBOL
PARAMETER
CONDITIONS
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
VL
ENABLE Pin Input Voltage LOW
VH
MIN
TYP
MAX
UNITS
–25
–75
µA
0.3
V
V+ – 0.35V
ENABLE Pin Input Voltage HIGH
= V+ – 0.35V, V
O = 1.5V to 3.5V
V
0.2
µA
Output Leakage Current
ENABLE
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k, VS = 5V
300
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k, VS = 5V
41
µs
GBW
Gain Bandwidth Product
Frequency = 1MHz, VS = 5V
LT6230-10
SR
Slew Rate
VS = 5V, AV = –1, RL = 1k, VO = 1.5V to 3.5V
200
1300
MHz
MHz
60
V/µs
250
V/µs
6.3
MHz
LT6230-10, HD2 = HD3 = ≤ 1%
11
MHz
0.1%, VS = 5V, VSTEP = 2V, AV = –1, RL = 1k
55
ns
42
LT6230-10, VS = 5V, AV = –10, RL = 1k,
VO = 1.5V to 3.5V
FPBW
Full Power Bandwidth
tS
Settling Time (LT6230, LT6231, LT6232)
10
VS = 5V, VOUT = 3VP-P (Note 9)
4.8
The ● denotes the specifications which apply over 0°C < TA < 70°C temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half
supply, ENABLE = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
LT6230S6, LT6230S6-10
LT6231S8, LT6232GN
LT6231DD
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
VCM = Half Supply
MAX
UNITS
●
●
●
MIN
600
450
550
µV
µV
µV
●
800
µV
VOS TC
Input Offset Voltage Drift (Note 10)
IB
Input Bias Current
●
TYP
0.5
●
3
µV/°C
11
µA
IB Match (Channel-to-Channel) (Note 6)
●
1
µA
IOS
Input Offset Current
●
0.7
µA
AVOL
Large-Signal Gain
VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS /2
RL = 1k to VS /2
RL = 100Ω to VS /2
VO = 1V to 4V,
●
●
●
78
17
4.1
V/mV
V/mV
V/mV
VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS /2
RL = 1k to VS /2
●
●
66
13
V/mV
V/mV
VCM
Input Voltage Range
Guaranteed by CMRR, VS = 5V, 0V
VS = 3.3V, 0V
●
●
1.5
1.15
CMRR
Common Mode Rejection Ratio
VS = 5V, VCM = 1.5V to 4V
VS = 3.3V, VCM = 1.15V to 2.65V
●
●
90
85
dB
dB
●
84
dB
PSRR
CMRR Match (Channel-to-Channel) (Note 6) VS = 5V, VCM = 1.5V to 4V
Power Supply Rejection Ratio
VS = 3V to 10V
●
85
dB
PSRR Match (Channel-to-Channel) (Note 6)
●
79
dB
●
3
V
VS = 3V to 10V
Minimum Supply Voltage (Note 7)
VOL
Output Voltage Swing LOW (Note 8)
No Load
ISINK = 5mA
VS = 5V, ISINK = 20mA
VS = 3.3V, ISINK = 15mA
●
●
●
●
4
2.65
50
200
500
380
V
V
mV
mV
mV
mV
sn623012 623012fas
4
LT6230/LT6230-10/
LT6231/LT6232
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over 0°C < TA < 70°C
temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, ENABLE = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VOH
Output Voltage Swing HIGH (Note 8)
No Load
ISOURCE = 5mA
VS = 5V, ISOURCE = 20mA
VS = 3.3V, ISOURCE = 15mA
●
●
●
●
ISC
Short-Circuit Current
VS = 5V
VS = 3.3V
●
●
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
ENABLE = V+ – 0.25V
●
●
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
VL
ENABLE Pin Input Voltage LOW
VH
ENABLE Pin Input Voltage HIGH
Output Leakage Current
MIN
TYP
MAX
UNITS
60
215
650
430
mV
mV
mV
mV
±25
±20
mA
mA
4.2
mA
µA
●
–85
µA
●
0.3
V
●
1
V+ – 0.25V
V
ENABLE = V+ – 0.25V, VO = 1.5V to 3.5V
●
1
µA
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k, VS = 5V
●
300
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k, VS = 5V
●
65
µs
SR
Slew Rate
VS = 5V, AV = –1, RL = 1k, VO = 1.5V to 3.5V
●
LT6230-10, AV = –10, RL = 1k,
VO = 1.5V to 3.5V
●
225
V/µs
VS = 5V, VOUT = 3VP-P
LT6230, LT6231, LT6232
●
FPBW
Full Power Bandwidth (Note 9)
35
V/µs
3.7
MHz
The ● denotes the specifications which apply over – 40°C < TA < 85°C temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half
supply, ENABLE = 0V, unless otherwise noted. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
LT6230S6, LT6230S6-10
LT6231S8, LT6232GN
LT6231DD
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
MAX
UNITS
●
●
●
MIN
TYP
700
550
650
µV
µV
µV
●
1000
µV
VOS TC
Input Offset Voltage Drift (Note 10)
3
µV/°C
IB
Input Bias Current
●
12
µA
VCM = Half Supply
0.5
●
IB Match (Channel-to-Channel) (Note 6)
●
1.1
µA
IOS
Input Offset Current
●
0.8
µA
AVOL
Large-Signal Gain
VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS /2
RL = 1k to VS /2
RL = 100Ω to VS /2
VO = 1V to 4V,
●
●
●
72
16
3.6
V/mV
V/mV
V/mV
VS = 3.3V, VO = 0.65V to 2.65V,RL = 10k to VS /2 ●
RL = 1k to VS /2 ●
60
12
V/mV
V/mV
VCM
Input Voltage Range
Guaranteed by CMRR, VS = 5V, 0V
VS = 3.3V, 0V
●
●
1.5
1.15
CMRR
Common Mode Rejection Ratio
VS = 5V, VCM = 1.5V to 4V
VS = 3.3V, VCM = 1.15V to 2.65V
●
●
90
85
dB
dB
CMRR Match (Channel-to-Channel) (Note 6)
VS = 5V, VCM = 1.5V to 4V
●
84
dB
Power Supply Rejection Ratio
VS = 3V to 10V
●
85
dB
PSRR
4
2.65
V
V
sn623012 623012fas
5
LT6230/LT6230-10/
LT6231/LT6232
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over – 40°C < TA < 85°C
temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, ENABLE = 0V, unless otherwise noted. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
PSRR Match (Channel-to-Channel) (Note 6)
VS = 3V to 10V
Minimum Supply Voltage (Note 7)
MIN
TYP
MAX
UNITS
●
79
dB
●
3
V
VOL
Output Voltage Swing LOW (Note 8)
No Load
ISINK = 5mA
VS = 5V, ISINK = 15mA
VS = 3.3V, ISINK = 15mA
●
●
●
●
60
210
510
390
mV
mV
mV
mV
VOH
Output Voltage Swing HIGH (Note 6)
No Load
ISOURCE = 5mA
VS = 5V, ISOURCE = 20mA
VS = 3.3V, ISOURCE = 15mA
●
●
●
●
70
220
675
440
mV
mV
mV
mV
ISC
Short-Circuit Current
VS = 5V
VS = 3.3V
●
●
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
ENABLE = V+ – 0.2V
●
●
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
VL
ENABLE Pin Input Voltage LOW
VH
ENABLE Pin Input Voltage HIGH
Output Leakage Current
±15
±15
mA
mA
4.4
mA
µA
●
–100
µA
●
0.3
V
●
1
V+ – 0.2V
V
ENABLE = V+ – 0.2V, VO = 1.5V to 3.5V
●
1
µA
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k, VS = 5V
●
300
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k, VS = 5V
●
72
µs
SR
Slew Rate
VS = 5V, AV = –1, RL = 1k, VO = 1.5V to 3.5V
●
LT6230-10, AV = –10, RL = 1k,
VO = 1.5V to 3.5V
●
185
V/µs
VS = 5V, VOUT = 3VP-P
LT6230, LT6231, LT6232
●
FPBW
Full Power Bandwidth (Note 9)
31
V/µs
3.3
MHz
TA = 25°C, VS = ±5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
LT6230, LT6230-10
LT6231S8, LT6232GN
LT6231DD
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
IB
IOS
MIN
TYP
MAX
UNITS
100
50
75
500
350
450
µV
µV
µV
100
600
µV
5
10
µA
IB Match (Channel-to-Channel) (Note 6)
0.1
0.9
µA
Input Offset Current
0.1
0.6
µA
Input Bias Current
Input Noise Voltage
0.1Hz to 10Hz
180
en
Input Noise Voltage Density
f = 10kHz
1.1
in
Input Noise Current Density, Balanced Source
Unbalanced Source
f = 10kHz, RS = 10k
f = 10kHz, RS = 10k
1
2.4
nVP-P
1.7
nV/√Hz
pA/√Hz
pA/√Hz
sn623012 623012fas
6
LT6230/LT6230-10/
LT6231/LT6232
ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = ±5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
Input Resistance
Common Mode
Differential Mode
6.5
7.5
MΩ
kΩ
CIN
Input Capacitance
Common Mode
Differential Mode
2.4
6.5
pF
pF
AVOL
Large-Signal Gain
VO = ±4.5V, RL = 10k
RL = 1k
VO = ±2V, RL = 100Ω
140
35
8.5
260
65
16
V/mV
V/mV
V/mV
VCM
Input Voltage Range
Guaranteed by CMRR
–3
CMRR
Common Mode Rejection Ratio
VCM = –3V to 4V
95
120
dB
CMRR Match (Channel-to-Channel) (Note 6)
VCM = –3V to 4V
89
125
dB
4
UNITS
V
Power Supply Rejection Ratio
VS = ±1.5V to ±5V
90
115
dB
PSRR Match (Channel-to-Channel) (Note 6)
VS = ±1.5V to ±5V
84
115
dB
VOL
Output Voltage Swing LOW (Note 8)
No Load
ISINK = 5mA
ISINK = 20mA
4
85
240
40
190
460
mV
mV
mV
VOH
Output Voltage Swing HIGH (Note 8)
No Load
ISOURCE = 5mA
ISOURCE = 20mA
5
90
325
50
200
600
mV
mV
mV
ISC
Short-Circuit Current
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
3.3
0.2
3.9
ENABLE = 4.65V
mA
µA
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
–35
–85
µA
VL
ENABLE Pin Input Voltage LOW
0.3
V
VH
ENABLE Pin Input Voltage HIGH
10
µA
PSRR
±30
mA
4.65
V
Output Leakage Current
ENABLE = V+ – 4.65V, VO = ±1V
0.2
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k
300
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k
GBW
Gain Bandwidth Product
Frequency = 1MHz
LT6230-10
SR
Slew Rate
AV = –1, RL = 1k, VO = –2V to 2V
62
150
1000
50
Full Power Bandwidth
tS
Settling Time (LT6230, LT6231, LT6232)
µs
MHz
MHz
70
V/µs
320
V/µs
7.4
MHz
LT6230-10, HD2 = HD3 ≤ 1%
11
MHz
0.1%, VSTEP = 2V, AV = –1, RL = 1k
50
ns
LT6230-10, AV = –10, RL = 1k, VO = –2V to 2V
FPBW
215
1450
ns
VOUT = 3VP-P (Note 9)
5.3
sn623012 623012fas
7
LT6230/LT6230-10/
LT6231/LT6232
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over 0°C < TA < 70°C
temperature range. VS = ±5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
LT6230S6, LT6230S6-10
LT6231S8, LT6232GN
LT6231DD
MAX
UNITS
●
●
●
MIN
600
450
550
µV
µV
µV
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
●
800
µV
VOS TC
Input Offset Voltage Drift (Note 10)
●
IB
Input Bias Current
●
11
µA
IB Match (Channel-to-Channel) (Note 6)
●
1
µA
0.5
IOS
Input Offset Current
AVOL
Large-Signal Gain
VO = ±4.5V, RL = 10k
RL = 1k
VO = ±2V, RL = 100Ω
●
●
●
100
27
6
VCM
Input Voltage Range
Guaranteed by CMRR
●
–3
CMRR
TYP
3
0.7
●
µV/°C
µA
V/mV
V/mV
V/mV
4
V
Common Mode Rejection Ratio
VCM = –3V to 4V
●
95
dB
CMRR Match (Channel-to-Channel) (Note 6)
VCM = –3V to 4V
●
89
dB
dB
Power Supply Rejection Ratio
VS = ±1.5V to ±5V
●
85
PSRR Match (Channel-to-Channel) (Note 6)
VS = ±1.5V to ±5V
●
79
VOL
Output Voltage Swing LOW (Note 8)
No Load
ISINK = 5mA
ISINK = 20mA
●
●
●
50
200
500
mV
mV
mV
VOH
Output Voltage Swing HIGH (Note 8)
No Load
ISOURCE = 5mA
ISOURCE = 20mA
●
●
●
60
215
650
mV
mV
mV
ISC
Short-Circuit Current
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
ENABLE = 4.75V
●
●
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
VL
ENABLE Pin Input Voltage LOW
VH
ENABLE Pin Input Voltage HIGH
PSRR
tON
●
dB
±25
mA
4.6
mA
µA
●
–95
µA
●
0.3
V
●
1
4.75
V
Output Leakage Current
ENABLE = 4.75V, VO = ±1V
●
1
µA
Turn-On Time
ENABLE = 5V to 0V, RL = 1k
●
300
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k
●
SR
Slew Rate
AV = –1, RL = 1k, VO = –2V to 2V
●
LT6230-10, AV = –10, RL = 1k, VO = –2V to 2V
●
FPBW
Full Power Bandwidth
VOUT = 3VP-P (Note 9)
LT6230, LT6231, LT6232
●
85
44
315
4.66
µs
V/µs
V/µs
MHz
sn623012 623012fas
8
LT6230/LT6230-10/
LT6231/LT6232
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over –40°C < TA < 85°C
temperature range. VS = ±5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
LT6230, LT6230-10
LT6231S8, LT6232GN
LT6231DD
MAX
UNITS
●
●
●
MIN
700
550
650
µV
µV
µV
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
●
1000
µV
VOS TC
Input Offset Voltage Drift (Note 10)
●
IB
Input Bias Current
●
12
µA
IB Match (Channel-to-Channel) (Note 6)
●
1.1
µA
0.5
IOS
Input Offset Current
AVOL
Large-Signal Gain
VO = ±4.5V, RL = 10k
RL = 1k
VO = ±1.5V, RL = 100Ω
●
●
●
93
25
4.8
VCM
Input Voltage Range
Guaranteed by CMRR
●
–3
CMRR
TYP
3
0.8
●
µV/°C
µA
V/mV
V/mV
V/mV
4
V
Common Mode Rejection Ratio
VCM = –3V to 4V
●
95
dB
CMRR Match (Channel-to-Channel) (Note 6)
VCM = –3V to 4V
●
89
dB
dB
Power Supply Rejection Ratio
VS = ±1.5V to ±5V
●
85
PSRR Match (Channel-to-Channel) (Note 6)
VS = ±1.5V to ±5V
●
79
VOL
Output Voltage Swing LOW (Note 8)
No Load
ISINK = 5mA
ISINK = 15mA
●
●
●
60
210
510
mV
mV
mV
VOH
Output Voltage Swing HIGH (Note 8)
No Load
ISOURCE = 5mA
ISOURCE = 20mA
●
●
●
70
220
675
mV
mV
mV
ISC
Short-Circuit Current
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
ENABLE = 4.8V
●
●
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
VL
ENABLE Pin Input Voltage LOW
VH
ENABLE Pin Input Voltage HIGH
PSRR
Output Leakage Current
●
dB
±15
mA
4.85
mA
µA
●
–110
µA
●
0.3
V
●
1
4.8
V
ENABLE = 4.8V, VO = ±1V
●
1
µA
ns
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k
●
300
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k
●
72
SR
Slew Rate
AV = –1, RL = 1k, VO = –2V to 2V
●
LT6230-10, AV = –10, RL = 1k, VO = –2V to 2V
●
FPBW
Full Power Bandwidth (Note 9)
VOUT = 3VP-P
LT6230, LT6231, LT6232
●
37
260
3.9
µs
V/µs
V/µs
MHz
sn623012 623012fas
9
LT6230/LT6230-10/
LT6231/LT6232
ELECTRICAL CHARACTERISTICS
Note 1: Absolute maximum ratings are those values beyond which the life
of the device may be impaired.
Note 2: Inputs are protected by back-to-back diodes. If the differential
input voltage exceeds 0.7V, the input current must be limited to less than
40mA.
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 LT6230C/LT6230I the LT6231C/LT6231I, and LT6232C/
LT6232I are guaranteed functional over the temperature range of –40°C
and 85°C.
Note 5: The LT6230C/LT6231C/LT6232C are guaranteed to meet specified
performance from 0°C to 70°C. The LT6230C/LT6231C/LT6232C 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.
The LT6230I/LT6231I/LT6232I are guaranteed to meet specified
performance from –40°C to 85°C.
Note 6: Matching parameters are the difference between the two amplifiers
A and D and between B and C of the LT6232; between the two amplifiers
of the LT6231. CMRR and PSRR match are defined as follows: CMRR and
PSRR are measured in µV/V on the matched amplifiers. The difference is
calculated between the matching sides in µV/V. The result is converted
to dB.
Note 7: Minimum supply voltage is guaranteed by power supply rejection
ratio test.
Note 8: Output voltage swings are measured between the output and
power supply rails.
Note 9: Full-power bandwidth is calculated from the slew rate:
FPBW = SR/2πVP
Note 10: This parameter is not 100% tested.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
(LT6230/LT6231/LT6232)
Supply Current vs Supply Voltage
(Per Amplifier)
VOS Distribution
6
100
VS = 5V, 0V
+
90 VCM = V /2
S8
80
2.0
60
50
40
30
20
4
TA = 125°C
3
TA = 25°C
2
TA = –55°C
OFFSET VOLTAGE (mV)
70
1
0
0
2
10
12
4
8
6
TOTAL SUPPLY VOLTAGE (V)
623012 GO1
10
TA = –55°C
TA = 125°C
TA = 25°C
2
–1
0
4
5
3
2
COMMON MODE VOLTAGE (V)
1
6
623012 GO4
TA = –55°C
–1.0
TA = 25°C
TA = 125°C
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
INPUT COMMON MODE VOLTAGE (V)
623012 GO3
Output Saturation Voltage vs
Load Current (Output Low)
10
VS = 5V, 0V
8
7
VCM = 4V
6
VCM = 1.5V
5
4
0
–2
14
9
INPUT BIAS CURRENT (µA)
INPUT BIAS CURRENT (µA)
12
4
–0.5
–2.0
OUTPUT SATURATION VOLTAGE (V)
10
6
0
Input Bias Current vs Temperature
VS = 5V, 0V
8
0.5
623012 GO2
Input Bias Current vs
Common Mode Voltage
14
1.0
–1.5
10
0
50 100 150 200
–200 –150 –100 –50 0
INPUT OFFSET VOLTAGE (µV)
VS = 5V, 0V
1.5
5
SUPPLY CURRENT (mA)
NUMBER OF UNITS
Offset Voltage vs Input Common
Mode Voltage
3
–50 –25
75
50
25
TEMPERATURE (°C)
0
100
125
623012 GO5
VS = 5V, 0V
1
0.1
TA = 125°C
TA = –55°C
0.01
TA = 25°C
0.001
0.01
0.1
1
10
LOAD CURRENT (mA)
100
623012 GO6
sn623012 623012fas
10
LT6230/LT6230-10/
LT6231/LT6232
U W
TYPICAL PERFOR A CE CHARACTERISTICS
(LT6230/LT6231/LT6232)
Output Saturation Voltage vs
Load Current (Output High)
1.0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
TOTAL SUPPLY VOLTAGE (V)
70
60
SINKING
TA = 125°C
50
40
TA = 25°C
30
20
TA = –55°C
10
0
–10
SOURCING
TA = 125°C
–20
TA = –55°C
–30
–40
–50
TA = 25°C
–60
–70
4
4.5
5
2
2.5
3.5
3
1.5
POWER SUPPLY VOLTAGE (±V)
623012 G08
623012 GO9
VCM = VS/2
0.8
0.6
1
TA = 125°C
0.1
TA = –55°C
TA = 25°C
0.01
0.4
0.2
0
–0.2
TA = –55°C
–0.4
TA = 125°C
–0.6
TA = 25°C
–0.8
0.001
0.01
0.1
1
10
LOAD CURRENT (mA)
–1.0
100
623012 G07
Open Loop Gain
2.5
Open Loop Gain
2.5
VS = 3V, 0V
TA = 25°C
2.0
0.5
RL = 1k
0
RL = 100Ω
–0.5
–1.0
1.5
INPUT VOLTAGE (mV)
1.0
1.0
0.5
RL = 1k
0
RL = 100Ω
–0.5
–1.0
1.0
0.5
–0.5
–1.5
–1.5
–2.0
–2.0
1
1.5
2
OUTPUT VOLTAGE (V)
2.5
–2.5
3
623012 G10
30
TA = –55°C
0.5
0
–0.5
TA = 25°C
TA = 125°C
–1.0
–1.5
CHANGE IN OFFSET VOLTAGE (µV)
1.0
100
28
VS = ±5V
24
VS = ±2.5V
22
20
VS = ±1.5V
18
5
Total Noise vs Total Source
Resistance
TA = 25°C
26
4
623012 G12
Warm-Up Drift vs Time
VS = ±5V
1.5
–5 –4 –3 –2 –1 0 1 2 3
OUTPUT VOLTAGE (V)
623012 G11
Offset Voltage vs Output Current
2.0
–2.5
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
OUTPUT VOLTAGE (V)
TOTAL NOISE (nV/√Hz)
0.5
RL = 100Ω
–1.0
–2.0
0
RL = 1k
0
–1.5
–2.5
VS = ±5V
TA = 25°C
2.0
1.5
INPUT VOLTAGE (mV)
INPUT VOLTAGE (mV)
Open Loop Gain
2.5
VS = 5V, 0V
TA = 25°C
2.0
1.5
OFFSET VOLTAGE (mV)
OUTPUT SHORT-CIRCUIT CURRENT (mA)
VS = 5V, 0V
OFFSET VOLTAGE (mV)
OUTPUT SATURATION VOLTAGE (V)
10
Output Short Circuit Current vs
Power Supply Voltage
Minimum Supply Voltage
16
VS = ±2.5V
VCM = 0V
f = 100kHz
UNBALANCED
SOURCE
10 RESISTORS
TOTAL NOISE
RESISTOR NOISE
1
AMPLIFIER NOISE VOLTAGE
14
12
–2.0
–75 –60 –45 –30 –15 0 15 30 45 60 75
OUTPUT CURRENT (mA)
623012 G13
10
0.1
0
20
40 60 80 100 120 140 160
TIME AFTER POWER-UP (s)
623012 G14
10
100
1k
10k
SOURCE RESISTANCE (Ω)
100k
623012 G15
sn623012 623012fas
11
LT6230/LT6230-10/
LT6231/LT6232
U W
TYPICAL PERFOR A CE CHARACTERISTICS
(LT6230/LT6231/LT6232)
0.1Hz to 10Hz Output Voltage
Noise
Noise Voltage and Unbalanced
Noise Current vs Frequency
3
3
NOISE CURRENT
2
2
1
1
10
100
100nV
–100nV
0
100k
1k
10k
FREQUENCY (Hz)
GAIN (dB)
120
CL = 5pF
RL = 1k
100
VCM = VS/2
80
VS = ±5V
60
40
30
20
20
0
VS = ±5V
10
–20
GAIN
0
–40
VS = 3V, 0V
–10
–20
100k
1M
10M
100M
FREQUENCY (Hz)
1G
40
240
220
200
GAIN BANDWIDTH
180
–60
160
–80
140
AV = 2
0.1
0.01
100k
1M
10M
FREQUENCY (Hz)
70
60
100M
623012 G22
VS = ±2.5V FALLING
50
VS = ±2.5V RISING
40
30
0
2
10
12
8
6
TOTAL SUPPLY VOLTAGE (V)
4
20
–55 –35 –15
14
5 25 45 65 85 105 125
TEMPERATURE (°C)
623012 G21
Channel Separation vs Frequency
–40
100
CHANNEL SEPARATION (dB)
AV = 10
AV = 1
80 VS = ±5V RISING
623012 G20
COMMON MODE REJECTION RATIO (dB)
OUTPUT IMPEDANCE (Ω)
100
125
VS = ±5V FALLING
90
Common Mode Rejection Ratio vs
Frequency
VS = 5V, 0V
95
AV = –1
110 RF = RG = 1k
120
1
65
35
5
TEMPERATURE (°C)
–25
100
50
PHASE MARGIN
Output Impedance vs Frequency
10
GAIN BANDWIDTH
120
60
623012 G19
1k
VS = 3V, 0V
180
Slew Rate vs Temperature
70
TA = 25°C
CL = 5pF
RL = 1k
PHASE (dB)
VS = 3V, 0V
40
200
623012 G18
PHASE MARGIN (DEG)
50
40
VS = ±5V
220
Gain Bandwidth and Phase Margin
vs Supply Voltage
GAIN BANDWIDTH (MHz)
PHASE
60
VS = 3V, 0V
240
623012 G17
Open Loop Gain vs Frequency
70
60
VS = ±5V
50
140
–55
5s/DIV
623012 G16
80
PHASE MARGIN
160
SLEW RATE (V/µs)
0
NOISE VOLTAGE
70
CL = 5pF
RL = 1k
VCM = VS/2
GAIN BANDWIDTH (MHz)
4
100nV/DIV
4
VS = ±2.5V
80
60
40
20
VS = 5V, 0V
VCM = VS/2
0
10k
100k
AV = 1
–50 TA = 25°C
VS = ±5V
–60
–70
–80
–90
–100
–110
–120
–130
1M
10M
FREQUENCY (Hz)
100M
1G
623012 G23
–140
100k
1M
10M
FREQUENCY (Hz)
100M
623012 G24
sn623012 623012fas
12
PHASE MARGIN (DEG)
5
6
VS = ±2.5V
TA = 25°C
VCM = 0V
5
UNBALANCED NOISE CURRENT (pA/√Hz)
NOISE VOLTAGE (nV/√Hz)
6
Gain Bandwidth and Phase Margin
vs Temperature
LT6230/LT6230-10/
LT6231/LT6232
U W
TYPICAL PERFOR A CE CHARACTERISTICS
(LT6230/LT6231/LT6232)
Power Supply Rejection Ratio vs
Frequency
VS = 5V, 0V
TA = 25°C
VCM = VS/2
80
50
50
40
40
POSITIVE SUPPLY
60
NEGATIVE SUPPLY
40
VS = 5V, 0V
45 AV = 2
35
RS = 10Ω
30
25
RS = 20Ω
20
15
30
20
15
5
0
10k
1M
100k
FREQUENCY (Hz)
10M
0
10
100M
100
CAPACITIVE LOAD (pF)
Settling Time vs Output Step
(Non-Inverting)
500Ω
–
VOUT
+
VIN
500Ω
100
1mV
1mV
50
–4
–3
–2
2
1
0
OUTPUT STEP (V)
–1
–
VIN
VOUT
+
100
1mV
1mV
50
10mV
10mV
0
150
3
10mV
0
4
–4
–3
10mV
–2
2
–1
1
0
OUTPUT STEP (V)
623012 G28
7
6
5
4
V = ±5V
3 T S = 25°C
A
HD2, HD3 < –40dBc
2
100k
1M
10k
FREQUENCY (Hz)
10M
Distortion vs Frequency
–40
VS = ±5V
AV = 1
–50 VOUT = 2V(P–P)
VS = ±2.5V
AV = 2
–50 VOUT = 2V(P–P)
RL = 100Ω, 3RD
DISTORTION (dBc)
RL = 100Ω, 2ND
–70
RL = 1k, 2ND
–80
DISTORTION (dBc)
RL = 100Ω, 3RD
RL = 100Ω, 3RD
–60
RL = 100Ω, 2ND
–70
RL = 1k, 2ND
–80
–90
–90
–60
–70
10M
623012 G31
–100
10k
RL = 100Ω, 2ND
–80
RL = 1k, 2ND
–90
RL = 1k, 3RD
RL = 1k, 3RD
100k
1M
FREQUENCY (Hz)
AV = 2
8
623012 G30
–40
VS = ±2.5V
AV = 1
–50 VOUT = 2V(P–P)
DISTORTION (dBc)
4
AV = –1
9
Distortion vs Frequency
Distortion vs Frequency
–100
10k
3
10
623012 G29
–40
–60
Maximum Undistorted Output
Signal vs Frequency
VS = ±5V
TA = 25°C
AV = –1
500Ω
SETTLING TIME (ns)
SETTLING TIME (ns)
200
1000
623012 G27
Settling Time vs Output Step
(Inverting)
VS = ±5V
TA = 25°C
AV = 1
150
100
CAPACITIVE LOAD (pF)
623012 G26
623012 G25
200
10
1000
OUTPUT VOLTAGE SWING (VP–P)
1k
RS = 50Ω
RL = 50Ω
10
5
0
RS = 20Ω
25
RS = 50Ω
RL = 50Ω
10
20
RS = 10Ω
35
OVERSHOOT (%)
100
Series Output Resistance and
Overshoot vs Capacitive Load
VS = 5V, 0V
45 AV = 1
OVERSHOOT (%)
POWER SUPPLY REJECTION RATIO (dB)
120
Series Output Resistance and
Overshoot vs Capacitive Load
100k
1M
FREQUENCY (Hz)
10M
623012 G32
–100
10k
RL = 1k, 3RD
100k
1M
FREQUENCY (Hz)
10M
623012 G33
sn623012 623012fas
13
LT6230/LT6230-10/
LT6231/LT6232
U W
TYPICAL PERFOR A CE CHARACTERISTICS
(LT6230/LT6231/LT6232)
Large Signal Response
Distortion vs Frequency
Small Signal Response
–40
RL = 100Ω, 3RD
RL = 100Ω, 2ND
–60
RL = 1k, 3RD
–70
50mV/DIV
2V
1V/DIV
DISTORTION (dBc)
VS = ±5V
AV = 2
–50 VOUT = 2V(P–P)
0V
0V
–2V
–80
–90
–100
10k
VS = ±2.5V
AV = –1
RL = 1k
RL = 1k, 2ND
100k
1M
FREQUENCY (Hz)
VS = ±2.5V
AV = 1
RL = 1k
200ns/DIV
623345 G35
200ns/DIV
623345 G36
10M
623012 G34
Output Overdrive Recovery
VIN
(1V/DIV)
Large Signal Response
0V
0V
VOUT
(2V/DIV)
2V/DIV
5V
–5V
VS = ±5V
AV = 1
RL = 1k
0V
VS = ±2.5V
AV = 3
200ns/DIV
200ns/DIV
623345 G37
623345 G38
(LT6230) ENABLE Characteristics
Supply Current vs ENABLE Pin
Voltage
ENABLE Pin Current vs ENABLE
Pin Voltage
30
TA = –55°C
TA = 125°C
25
TA = 25°C
3.0
2.5
VS = ±2.5V
AV = 1
TA = –55°C
2.0
1.5
1.0
20 TA = 25°C
0
VS = ±2.5V
–2.0
1.0
0
–1.0
PIN VOLTAGE (V)
2.0
623012 G39
0V
15 T = 125°C
A
0.5V
10
5
0.5
5V
VOUT
3.5
ENABLE PIN CURRENT (µA)
SUPPLY CURRENT (mA)
4.0
ENABLE Pin Response Time
ENABLE PIN
4.5
0
–2.0
0
1.0
–1.0
PIN VOLTAGE (V)
2.0
0V
VS = ±2.5V
VIN = 0.5V
AV = 1
RL = 1k
100µs/DIV
623345 G41
623012 G40
sn623012 623012fas
14
LT6230/LT6230-10/
LT6231/LT6232
U W
TYPICAL PERFOR A CE CHARACTERISTICS
(LT6230-10)
Gain Bandwidth and Phase Margin
vs Temperature
600
1100
VS = 3V, 0V
900
80
70
VS = ±5V
PHASE MARGIN
VS = 3V, 0V
75
50
25
TEMPERATURE (°C)
–50 –25
100
0
125
450
VS = ±5V RISING
400
350
300
250
200
50
150
40
100
–55 –35 –15
PHASE
10
VS = ±2.5V FALLING
0
20
VS = 3V, 0V
0
20
–20
0
–10
100k
1M
VS = ±5V
–40
TA = 25°C
AV = 10
1450 CL = 5pF
RL = 1k
GAIN BANDWIDTH
950
100
PHASE MARGIN
50
–80
1G
0
2
10
8
6
TOTAL SUPPLY VOLTAGE (V)
4
623012 G45
60
40
20
1M
10M
FREQUENCY (Hz)
100M
800
600
400
200
0
0
0
1G
623012 G48
1000
400
800
600
TOTAL RESISTOR LOAD (Ω)
(INCLUDES FEEDBACK R) 623012 G47
200
2nd and 3rd Harmonic Distortion vs
Frequency
–40
VS = ±2.5V
AV = 10
–50 VOUT = 2V(P–P)
10
9
OUTPUT VOLTAGE SWING (VP–P)
COMMON MODE REJECTION RATIO (dB)
80
100k
1000
Maximum Undistorted Output
Signal vs Frequency
VS = 5V, 0V
VCM = VS/2
100
0
10k
12
1200
623012 G46
Common Mode Rejection Ratio vs
Frequency
120
ASV = 10
V
±5V
TA = 25°C
RF = 1k
RG = 100
1400
–60
10M
100M
FREQUENCY (Hz)
Gain Bandwidth vs Resistor Load
1600
1200
10000
623012 G44
8
DISTORTION (dBc)
AV = 10
CL = 5pF
RL = 1k
VCM = VS/2
10
GAIN BANDWIDTH (MHz)
40
100
1000
CAPACITIVE LOAD (pF)
10
5 25 45 65 85 105 125
TEMPERATURE (°C)
PHASE MARGIN (DEG)
60
PHASE (DEG)
GAIN (dB)
80
VS = 3V, 0V
40
30
RS = 50Ω
20
1700
100
GAIN
50
30
623012 G43
120
VS = ±5V
RS = 20Ω
Gain Bandwidth and Phase Margin
vs Supply Voltage
90
60
RS = 10Ω
40
VS = ±2.5V RISING
60
Open Loop Gain and Phase vs
Frequency
70
VS = 5V, 0V
AV = 10
50
623012 G42
80
60
VS = ±5V FALLING
OVERSHOOT (%)
GAIN BANDWIDTH
1300
PHASE MARGIN (DEG)
GAIN BANDWIDTH (MHz)
1500
70
AV = –10
550 RF = 1k
RG = 100Ω
500
VS = ±5V
GAIN BANDWIDTH (MHz)
AV = 10
SLEW RATE (V/µs)
1700
Series Output Resistor and
Overshoot vs Capacitive Load
Slew Rate vs Temperature
7
6
5
4
–60
RL = 100Ω, 2ND
RL = 100Ω, 3RD
RL = 1k, 3RD
–70
RL = 1k, 2ND
–80
3
2 VS = ±5V
TA = 25°C
1 AV = 10
HD2 = HD3 ≤ 40dBc
0
100k
1M
10M
10k
FREQUENCY (Hz)
–90
100M
–100
10k
100k
1M
FREQUENCY (Hz)
10M
623012 G50
623012 G49
sn623012 623012fas
15
LT6230/LT6230-10/
LT6231/LT6232
U W
TYPICAL PERFOR A CE CHARACTERISTICS
(LT6230-10)
2nd and 3rd Harmonic Distortion vs
Frequency
Large Signal Response
Output-Overload Recovery
–40
VS = ±5V
AV = 10
–50 VOUT = 2V(P–P)
RL = 100Ω, 3RD
–70
–100
10k
0V
RL = 1k, 3RD
–80
–90
VOUT
VIN
(0.5V/DIV) (2V/DIV)
VOUT
(2V/DIV)
DISTORTION (dBc)
RL = 100Ω, 2ND
–60
0V
0V
RL = 1k, 2ND
VS = ±5V
100ns/DIV
AV = 10
RF = 900Ω, RG = 100Ω
100k
1M
FREQUENCY (Hz)
VS = 5V, 0V
100ns/DIV
AV = 10
RF = 900Ω, RG = 100Ω
623345 G52
623345 G53
10M
623012 G51
Input Referred High Frequency
Noise Spectrum
Small Signal Response
1nV/√Hz/DIV
VOUT
(100mV/DIV)
10
2.5V
0
VS = 5V, 0V
100ns/DIV
AV = 10
RF = 900Ω, RG = 100Ω
100kHz
50MHz
5MHz/DIV
623345 G54
623345 G55
sn623012 623012fas
16
LT6230/LT6230-10/
LT6231/LT6232
U
U
W
U
APPLICATIO S I FOR ATIO
Amplifier Characteristics
2.5V
Capacitor C1 reduces the unity cross frequency and
improves the frequency stability without degrading the
gain bandwidth of the amplifier. Capacitor CM sets the
overall amplifier gain bandwidth. The differential drive
generator supplies current to transistors Q5 and Q6 that
swing the output from rail-to-rail.
+V
Q5
CM
Q3
–V
+V
DESD1
+V
Q4
DESD5
VOUT
C1
DESD2
–V
Q1
–VIN
D1
DESD6
DIFFERENTIAL
DRIVE GENERATOR
–V
Q2
Q6
D2
+V
+VIN
DESD3
I1
DESD4
–V
BIAS
ENABLE
+V
–V
623012 F01
Figure 1. Simplified Schematic
Input Protection
There are back-to-back diodes, D1 and D2 across the + and
– inputs of these amplifiers to limit the differential input
voltage to ±0.7V. The inputs of the LT6230/LT6231/
LT6232 do not have internal resistors in series with the
input transistors. This technique is often used to protect
the input devices from over voltage that causes excessive
current to flow. The addition of these resistors would
significantly degrade the low noise voltage of these amplifiers. For instance, a 100Ω resistor in series with each
input would generate 1.8nV/√Hz of noise, and the total
amplifier noise voltage would rise from 1.1nV/√Hz to
2.1nV/√Hz. Once the input differential voltage exceeds
±0.7V, steady state current conducted through the protection diodes should be limited to ±40mA. This implies 25Ω
of protection resistance is necessary per volt of overdrive
beyond ±0.7V. These input diodes are rugged enough to
1V/DIV
Figure 1 is a simplified schematic of the LT6230/LT6231/
LT6232, which has a pair of low noise input transistors Q1
and Q2. A simple current mirror Q3/Q4 converts the
differential signal to a single-ended output, and these
transistors are degenerated to reduce their contribution to
the overall noise.
0V
–2.5V
500µs/DIV
623012 F02
Figure 2. VS = ±2.5V, AV = 1 with Large Overdrive
handle transient currents due to amplifier slew rate overdrive and clipping without protection resistors.
The photo of Figure 2 shows the output response to an
input overdrive with the amplifier connected as a voltage
follower. With the input signal low, current source I1
saturates and the differential drive generator drives Q6
into saturation so the output voltage swings all the way to
V–. The input can swing positive until transistor Q2 saturates into current mirror Q3/Q4. When saturation occurs,
the output tries to phase invert, but diode D2 conducts
current from the signal source to the output through the
feedback connection. The output is clamped a diode drop
below the input. In this photo, the input signal generator
is limiting at about 20mA.
With the amplifier connected in a gain of AV ≥ 2, the output
can invert with very heavy overdrive. To avoid this inversion, limit the input overdrive to 0.5V beyond the power
supply rails.
ESD
The LT6230/LT6231/LT6232 have reverse-biased ESD
protection diodes on all inputs and outputs as shown in
Figure 1. If these pins are forced beyond either supply,
unlimited current will flow through these diodes. If the
current is transient and limited to one hundred milliamps
or less, no damage to the device will occur.
Noise
The noise voltage of the LT6230/LT6231/LT6232 is equivalent to that of a 75Ω resistor, and for the lowest possible
noise it is desirable to keep the source and feedback
resistance at or below this value, i.e. RS + RG||RFB ≤ 75Ω.
sn623012 623012fas
17
LT6230/LT6230-10/
LT6231/LT6232
U
W
U
U
APPLICATIO S I FOR ATIO
With RS + RG||RFB = 75Ω the total noise of the amplifier is:
eN=√(1.1nV)2+(1.1nV)2 = 1.55nV/√Hz
Below this resistance value, the amplifier dominates the
noise, but in the region between 75Ω and about 3k, the
noise is dominated by the resistor thermal noise. As the
total resistance is further increased beyond 3k, the amplifier noise current multiplied by the total resistance eventually dominates the noise.
The product of eN • √ISUPPLY is an interesting way to gauge
low noise amplifiers. Most low noise amplifiers with low
eN have high ISUPPLY current. In applications that require
low noise voltage with the lowest possible supply current,
this product can prove to be enlightening. The LT6230/
LT6231/LT6232 have an eN • √ISUPPLY product of only 1.9
per amplifier, yet it is common to see amplifiers with
similar noise specifications to have eN • √ISUPPLY as high
as 13.5.
For a complete discussion of amplifier noise, see the
LT1028 data sheet.
Enable Pin
The LT6230 includes an ENABLE pin that shuts down the
amplifier to 10µA maximum supply current. The ENABLE
pin must be driven high to within 0.35V of V+ to shut down
the supply current. This can be accomplished with simple
gate logic; however care must be taken if the logic and the
LT6230 operate from different supplies. If this is the case,
then open drain logic can be used with a pull-up resistor
to ensure that the amplifier remains off. See Typical
Characteristic Curves.
The output leakage current when disabled is very low;
however, current can flow into the input protection diodes
D1 and D2 if the output voltage exceeds the input voltage
by a diode drop.
sn623012 623012fas
18
LT6230/LT6230-10/
LT6231/LT6232
U
U
W
U
APPLICATIO S I FOR ATIO
Single Supply, Low Noise, Low Power, Bandpass Filter with Gain = 10
Frequency Response Plot of
Bandpass Filter
23
R1
732Ω
C2
47pF
f0 =
V+
1 = 1MHz
2πRC
R2
732Ω
(
0.1µF
R3
10k
–
VIN
LT6230
+
C3
0.1µF
VOUT
EN
R4
10k
GAIN (dB)
C = √C1C2, R = R1 = R2
C1
1000pF
)
f0 = 732Ω MHz, MAXIMUM f0 = 1MHz
R
f–3dB = f0
2.5
AV = 20dB at f0
EN = 4µVRMS INPUT REFERRED
IS = 3.7mA FOR V+ = 5V
3
–7
100k
623012 F03
1M
FREQUENCY (Hz)
10M
623012 F04
Low Noise, Low Power, Single Supply, Instrumentation
Amplifier with Gain = 100
R1
30.9Ω
C2
2200pF
R2
V+ 511Ω
C8
68pF
–
U1
LT6230-10
+
VIN1
R15
88.7Ω
EN
C1
1µF
V+
R10
511Ω
R13
2k
–
R6
511Ω
U3
LT6230
+
R3
30.9Ω
R5
511Ω
R4
V+ 511Ω
C3
1µF
R12
511Ω
R14
2k
–
U2
LT6230-10
+
VIN2
R16
88.7Ω
EN
C9
68pF
VOUT
EN
C4
10µF
VOUT = 100 (VIN2 – VIN1)
(
GAIN = R2 + 1
R1
R10
) (R15
)
INPUT RESISTANCE = R5 = R6
f–3dB = 310Hz TO 11MHz
EN = 20µVRMS INPUT REFERRED
IS = 10.5mA FOR VS = 5V, 0V
R1 = R3
R2 = R4
R10 = R12
R15 = R16
623012 F05
sn623012 623012fas
19
LT6230/LT6230-10/
LT6231/LT6232
U
PACKAGE DESCRIPTIO
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
0.62
MAX
2.90 BSC
(NOTE 4)
0.95
REF
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 – 1.75
(NOTE 4)
PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45
6 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)
1.90 BSC
S6 TSOT-23 0302
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
sn623012 623012fas
20
LT6230/LT6230-10/
LT6231/LT6232
U
PACKAGE DESCRIPTIO
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698)
0.675 ±0.05
3.5 ±0.05
1.65 ±0.05
2.15 ±0.05 (2 SIDES)
PACKAGE
OUTLINE
0.25 ± 0.05
0.50
BSC
2.38 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
R = 0.115
TYP
5
3.00 ±0.10
(4 SIDES)
0.38 ± 0.10
8
1.65 ± 0.10
(2 SIDES)
PIN 1
TOP MARK
(NOTE 6)
(DD8) DFN 1203
0.200 REF
0.75 ±0.05
0.00 – 0.05
4
0.25 ± 0.05
1
0.50 BSC
2.38 ±0.10
(2 SIDES)
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON TOP AND BOTTOM OF PACKAGE
sn623012 623012fas
21
LT6230/LT6230-10/
LT6231/LT6232
U
PACKAGE DESCRIPTIO
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
× 45°
(0.254 – 0.508)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
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)
2
3
4
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
SO8 0303
sn623012 623012fas
22
LT6230/LT6230-10/
LT6231/LT6232
U
PACKAGE DESCRIPTIO
GN Package
16-Lead Plastic SSOP (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1641)
.189 – .196*
(4.801 – 4.978)
.045 ±.005
16 15 14 13 12 11 10 9
.254 MIN
.009
(0.229)
REF
.150 – .165
.229 – .244
(5.817 – 6.198)
.0165 ± .0015
.150 – .157**
(3.810 – 3.988)
.0250 BSC
RECOMMENDED SOLDER PAD LAYOUT
1
.015 ± .004
× 45°
(0.38 ± 0.10)
.007 – .0098
(0.178 – 0.249)
2 3
4
5 6
7
.0532 – .0688
(1.35 – 1.75)
8
.004 – .0098
(0.102 – 0.249)
0° – 8° TYP
.016 – .050
(0.406 – 1.270)
NOTE:
1. CONTROLLING DIMENSION: INCHES
INCHES
2. DIMENSIONS ARE IN
(MILLIMETERS)
.008 – .012
(0.203 – 0.305)
TYP
.0250
(0.635)
BSC
GN16 (SSOP) 0204
3. DRAWING NOT TO SCALE
*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
sn623012 623012fas
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.
23
LT6230/LT6230-10/
LT6231/LT6232
U
TYPICAL APPLICATIO S
The LT6230 is applied as a transimpedance amplifier with
an I-to-V conversion gain of 1.5kΩ set by R1.␣ The LT6230
is ideally suited to this application because of its low input
offset voltage and␣ current, and its low noise.␣ This is because the 1.5k resistor has an inherent thermal noise of
5nV/√Hz or 3.4pA/√Hz at room temperature, while the
LT6230␣ contributes only 1.1nV and 2.4pA /√Hz.␣ So, with
respect to both voltage and current noises, the LT6230 is
actually quieter than the gain resistor.
The circuit uses an avalanche photodiode with the cathode
biased to approximately 200V.␣ When light is incident on
the photodiode, it induces a current IPD which flows␣ into
the amplifier circuit. The amplifier output falls negative to
maintain balance at its inputs. The transfer function is
therefore VOUT = –IPD • 1.5k. C1 ensures stability and good
settling characteristics.␣ Output offset was measured
at␣ 280µV, so low in part because R2 serves to cancel the
DC effects of bias current.␣ Output noise was measured at
1.1mVP–P on a 100MHz measurement bandwidth, with C2
shunting R2’s thermal noise.␣ As shown in the scope
photo, the rise time is 17ns, indicating a signal bandwidth
of 20MHz.
Low Power Avalanche Photodiode Transimpedance Amplifier
IS = 3.3mA
≈ 200V BIAS
Photodiode Amplifier Time Domain Response
C1
4.7pF
WWW.ADVANCEDPHOTONIX.COM
30mV/DIV
ADVANCED PHOTONIX
012-70-62-541
R1
1.5k
5V
–
R2
1.5k
LT6230
+
50ns/DIV
–5V
ENABLE
623012 TA02b
623012 TA02a
C2
0.1µF
OUTPUT OFFSET = 500µV TYPICAL
BANDWIDTH = 20MHz
OUTPUT NOISE = 1.1mVP–P (100MHz MEASUREMENT BW)
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1028
Single, Ultra Low Noise 50MHz Op Amp
0.85nV/√Hz
LT1677
Single, Low Noise Rail-to-Rail Amplifier
3V Operation, 2.5mA, 4.5nV/√Hz, 60µV Max VOS
LT1806/LT1807
Single/Dual, Low Noise 325MHz Rail-to-Rail Amplifier
2.5V Operation, 550µV Max VOS, 3.5nV/√Hz
LT6200/LT6201
Single/Dual, Low Noise 165MHz
0.95nV√Hz, Rail-to-Rail Input and Output
LT6202/LT6203/LT6204
Single/Dual/Quad, Low Noise, Rail-to-Rail Amplifier
1.9nV/√Hz, 3mA Max, 100MHz Gain Bandwidth
sn623012 623012fas
24
Linear Technology Corporation
LT/TP 0304 1K REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
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 LINEAR TECHNOLOGY CORPORATION 2003