LINER LT6234IDD 60mhz, rail-to-rail output, 1.9nv / sigme hz, 1.15ma op amp family Datasheet

LT6233/LT6233-10/
LT6234/LT6235
60MHz, Rail-to-Rail Output,
1.9nV/√Hz, 1.15mA Op Amp Family
U
DESCRIPTIO
FEATURES
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Low Noise Voltage: 1.9nV/√Hz
Low Supply Current: 1.15mA/Amp Max
Low Offset Voltage: 350µV Max
Gain Bandwidth Product:
LT6233: 60MHz; AV ≥ 1
LT6233-10: 375MHz; 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
LT6233 Shutdown to 10µA Maximum
LT6233/LT6233-10 in SOT-23 Package
Dual LT6234 in Tiny DFN 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®6233/LT6234/LT6235 are single/dual/quad low
noise, rail-to-rail output unity gain stable op amps that
feature 1.9nV/√Hz noise voltage and draw only 1.15mA of
supply current per amplifier. These amplifiers combine
very low noise and supply current with a 60MHz gain
bandwidth product, a 17V/µs slew rate and are optimized
for low supply voltage signal conditioning systems. The
LT6233-10 is a single amplifier optimized for higher gain
applications resulting in higher gain bandwidth and slew
rate. The LT6233 and LT6233-10 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 2.1 per
amplifier is among the most noise efficient of any op amp.
The LT6233/LT6233-10 is available in the 6-lead SOT-23
package and the LT6234 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 LT6235 is available in the 16-pin
SSOP package.
U
TYPICAL APPLICATIO
Noise Voltage and Unbalanced
Noise Current vs Frequency
Low Noise Low Power Instrumentation Amplifier
VS+
6
R6
499Ω
VS+
R2
475Ω
+
R1
49.9Ω
LT6233
–
R3
475Ω
R5
499Ω
VOUT
EN
R7
VS– 499Ω
VS–
5
4
4
3
3
NOISE VOLTAGE
2
1
1/2 LT6234
IN–
NOISE VOLTAGE (nV/√Hz)
1/2 LT6234
6
VS = ±2.5V
TA = 25°C
VCM = 0V
5
AV = 20
BW = 2.8MHz
VS = ±1.5V to ±5V
IS = 3mA
EN = 8µVRMS INPUT REFERRED,
MEASUREMENT BW = 4MHz
623345 TA01a
2
1
NOISE CURRENT
0
10
100
1k
10k
FREQUENCY (Hz)
UNBALANCED NOISE CURRENT (pA/√Hz)
R4
499Ω
IN+
0
100k
623345 TA01b
623345f
1
LT6233/LT6233-10/
LT6234/LT6235
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 SOT-23
TJMAX = 150°C, θJA = 250°C/W
S6 PART
MARKING*
LTAFL
LTAFM
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 = 190°C/W
LT6234CS8
LT6234IS8
OUT A
1
–IN A
2
+IN A
3
V–
4
6234
6234I
–
+
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
LT6233CS6
LT6233IS6
LT6233CS6-10
LT6233IS6-10
TOP VIEW
+
TOP VIEW
ORDER PART
NUMBER
13 V
+
–B
+
C–
–
LT6234CDD
LT6234IDD
DD PART
MARKING*
LAET
ORDER PART
NUMBER
LT6235CGN
LT6235IGN
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
6235
6235I
*The temperature grade is identified by a label on the shipping container.Consult LTC Marketing for parts specified with wider operating temperature ranges.
623345f
2
LT6233/LT6233-10/
LT6234/LT6235
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
LT6233S6, LT6233S6-10
LT6234S8, LT6235GN
LT6234DD
MIN
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
IB
IOS
TYP
MAX
UNITS
100
50
75
500
350
450
µV
µV
µV
80
450
µV
Input Bias Current
1.5
3
µA
IB Match (Channel-to-Channel) (Note 6)
0.04
0.3
µA
Input Offset Current
0.04
0.3
µA
Input Noise Voltage
0.1Hz to 10Hz
220
en
Input Noise Voltage Density
f = 10kHz, VS = 5V
1.9
in
Input Noise Current Density, Balanced Source
Unbalanced Source
f = 10kHz, VS = 5V, RS = 10k
f = 10kHz, VS = 5V, RS = 10k
0.43
0.78
Input Resistance
Common Mode
Differential Mode
22
25
MΩ
kΩ
CIN
Input Capacitance
Common Mode
Differential Mode
2.5
4.2
pF
pF
AVOL
Large-Signal Gain
VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS/2
RL = 1k to VS/2
73
18
140
35
V/mV
V/mV
VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS/2
RL = 1k to VS/2
53
11
100
20
V/mV
V/mV
nV/√Hz
pA/√Hz
pA/√Hz
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
85
115
110
dB
dB
CMRR Match (Channel-to-Channel) (Note 6)
VS = 5V, VCM = 1.5V to 4V
90
115
dB
PSRR
1.5
1.15
nVP-P
3
4
2.65
V
V
Power Supply Rejection Ratio
VS = 3V to 10V
90
115
dB
PSRR Match (Channel-to-Channel) (Note 6)
VS = 3V to 10V
95
115
dB
Minimum Supply Voltage (Note 7)
3
V
VOL
Output Voltage Swing LOW (Note 8)
No Load
ISINK = 5mA
VS = 5V, ISINK = 15mA
VS = 3.3V, ISINK = 10mA
4
75
165
125
40
180
320
240
mV
mV
mV
mV
VOH
Output Voltage Swing HIGH (Note 8)
No Load
ISOURCE = 5mA
VS = 5V, ISOURCE = 15mA
VS = 3.3V, ISOURCE = 10mA
5
85
220
165
50
195
410
310
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
±40
±35
±55
±50
1.05
0.2
mA
mA
1.15
10
mA
µA
623345f
3
LT6233/LT6233-10/
LT6234/LT6235
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+ – 0.35
ENABLE Pin Input Voltage HIGH
V
µA
Output Leakage Current
ENABLE = V+ – 0.35V, V
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k, VS = 5V
500
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k, VS = 5V
76
µs
GBW
Gain Bandwidth Product
Frequency = 1MHz, VS = 5V
LT6233-10
55
320
MHz
MHz
SR
Slew Rate
VS = 5V, AV = –1, RL = 1k, VO = 0.5V to 4.5V
15
V/µs
80
V/µs
1.6
MHz
O = 1.5V to 3.5V
0.2
10
LT6233-10, VS = 5V, AV = –10, RL = 1k,
VO = 0.5V to 4.5V
1.06
10
FPBW
Full Power Bandwidth
VS = 5V, VOUT = 3VP-P (Note 9)
LT6233-10, HD2 = HD3 ≤ 1%
2.2
MHz
tS
Settling Time (LT6233, LT6234, LT6235)
0.1%, VS = 5V, VSTEP = 2V, AV = –1, RL = 1k
175
ns
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
LT6233S6, LT6233S6-10
LT6234S8, LT6235GN
LT6234DD
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
MAX
UNITS
●
●
●
MIN
TYP
600
450
550
µV
µV
µV
●
500
µV
VOS TC
Input Offset Voltage Drift (Note 10)
3.0
µV/°C
IB
Input Bias Current
●
3.5
µA
VCM = Half Supply
0.5
●
IB Match (Channel-to-Channel) (Note 6)
●
0.4
µA
IOS
Input Offset Current
●
0.4
µA
AVOL
Large-Signal Gain
VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS /2
RL = 1k to VS /2
●
●
47
12
V/mV
V/mV
VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS /2
RL = 1k to VS /2
●
●
40
7.5
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
●
90
dB
Power Supply Rejection Ratio
VS = 3V to 10V
●
90
dB
PSRR Match (Channel-to-Channel) (Note 6)
VS = 3V to 10V
●
95
dB
●
3
V
PSRR
Minimum Supply Voltage (Note 7)
VOL
Output Voltage Swing LOW (Note 8)
No Load
ISINK = 5mA
VS = 5V, ISINK = 15mA
VS = 3.3V, ISINK = 10mA
●
●
●
●
4
2.65
50
195
360
265
V
V
mV
mV
mV
mV
623345f
4
LT6233/LT6233-10/
LT6234/LT6235
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 = 15mA
VS = 3.3V, ISOURCE = 10mA
●
●
●
●
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
205
435
330
mV
mV
mV
mV
±35
±30
mA
mA
1.39
mA
µA
●
–85
µA
●
0.3
V
●
1
V+ – 0.25
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
●
500
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k, VS = 5V
●
120
µs
SR
Slew Rate
75
V/µs
FPBW
Full Power Bandwidth (Note 9)
VS = 5V, AV = –1, RL = 1k, VO = 0.5V to 4.5V
●
LT6233-10, AV = –10, RL = 1k,
VO = 0.5V to 4.5V
●
LT6233, VS = 5V, VOUT = 3VP-P
●
9
V/µs
955
kHz
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
LT6233S6, LT6233S6-10
LT6234S8, LT6235GN
LT6234DD
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
VOS TC
Input Offset Voltage Drift (Note 10)
IB
Input Bias Current
IB Match (Channel-to-Channel) (Note 6)
IOS
Input Offset Current
AVOL
Large-Signal Gain
VCM = Half Supply
MAX
UNITS
●
●
●
MIN
700
550
650
µV
µV
µV
●
550
µV
3
µV/°C
●
4
µA
●
0.4
µA
0.5
●
0.5
●
VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS /2
RL = 1k to VS /2
TYP
µA
●
●
45
11
V/mV
V/mV
VS = 3.3V, VO = 0.65V to 2.65V,RL = 10k to VS /2 ●
RL = 1k to VS /2 ●
38
7
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
●
90
dB
Power Supply Rejection Ratio
VS = 3V to 10V
●
90
dB
PSRR
4
2.65
V
V
623345f
5
LT6233/LT6233-10/
LT6234/LT6235
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
●
95
dB
●
3
V
VOL
Output Voltage Swing LOW (Note 8)
No Load
ISINK = 5mA
VS = 5V, ISINK = 15mA
VS = 3.3V, ISINK = 10mA
●
●
●
●
50
195
370
275
mV
mV
mV
mV
VOH
Output Voltage Swing HIGH (Note 6)
No Load
ISOURCE = 5mA
VS = 5V, ISOURCE = 15mA
VS = 3.3V, ISOURCE = 10mA
●
●
●
●
60
210
445
335
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
±30
±20
mA
mA
1.46
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
●
500
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k, VS = 5V
●
135
µs
SR
Slew Rate
70
V/µs
FPBW
Full Power Bandwidth (Note 9)
VS = 5V, AV = –1, RL = 1k, VO = 0.5V to 4.5V
●
LT6233-10, AV = –10, RL = 1k,
VO = 0.5V to 4.5V
●
LT6233, VS = 5V, VOUT = 3VP-P
●
8
V/µs
848
kHz
TA = 25°C, VS = ±5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
LT6233S6, LT6233S6-10
LT6234S8, LT6235GN
LT6234DD
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
450
µV
Input Bias Current
1.5
3
µA
IB Match (Channel-to-Channel) (Note 6)
0.04
0.3
µA
0.04
0.3
Input Offset Current
Input Noise Voltage
0.1Hz to 10Hz
220
en
Input Noise Voltage Density
f = 10kHz
1.9
in
Input Noise Current Density, Balanced Source
Unbalanced Source
f = 10kHz, RS = 10k
f = 10kHz, RS = 10k
0.43
0.78
µA
nVP-P
3.0
nV/√Hz
pA/√Hz
pA/√Hz
623345f
6
LT6233/LT6233-10/
LT6234/LT6235
ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = ±5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
Input Resistance
Common Mode
Differential Mode
22
25
MΩ
kΩ
CIN
Input Capacitance
Common Mode
Differential Mode
2.1
3.7
pF
pF
AVOL
Large-Signal Gain
VO = ±4.5V, RL = 10k
RL = 1k
97
28
180
55
V/mV
V/mV
VCM
Input Voltage Range
Guaranteed by CMRR
–3
CMRR
PSRR
MIN
TYP
MAX
4
UNITS
V
Common Mode Rejection Ratio
VCM = –3V to 4V
90
110
dB
CMRR Match (Channel-to-Channel) (Note 6)
VCM = –3V to 4V
95
120
dB
Power Supply Rejection Ratio
VS = ±1.5V to ±5V
90
115
dB
95
115
PSRR Match (Channel-to-Channel) (Note 6)
VS = ±1.5V to ±5V
VOL
Output Voltage Swing LOW (Note 8)
No Load
ISINK = 5mA
ISINK = 15mA
4
75
165
40
180
320
mV
mV
mV
VOH
Output Voltage Swing HIGH (Note 8)
No Load
ISOURCE = 5mA
ISOURCE = 15mA
5
85
220
50
195
410
mV
mV
mV
ISC
Short-Circuit Current
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
ENABLE = 4.65V
1.15
0.2
1.25
10
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
±40
dB
±55
mA
4.65
V
Output Leakage Current
ENABLE = 4.65V, VO = ±1V
0.2
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k
900
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k
100
µs
GBW
Gain Bandwidth Product
Frequency = 1MHz
LT6233-10
42
260
60
375
MHz
MHz
SR
Slew Rate
AV = –1, RL = 1k, VO = –2V to 2V
12
17
V/µs
115
V/µs
1.8
MHz
LT6233-10, AV = –10, RL = 1k,
VO = –2V to 2V
1.27
10
µA
FPBW
Full Power Bandwidth
VOUT = 3VP-P (Note 9)
LT6233-10, HD2 = HD3 ≤ 1%
2.2
MHz
tS
Settling Time (LT6233, LT6234, LT6235)
0.1%, VSTEP = 2V, AV = –1, RL = 1k
170
ns
623345f
7
LT6233/LT6233-10/
LT6234/LT6235
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
LT6233S6, LT6233S6-10
LT6234S8, LT6235GN
LT6234DD
MAX
UNITS
●
●
●
MIN
TYP
600
450
550
µV
µV
µV
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
●
500
µV
VOS TC
Input Offset Voltage Drift (Note 10)
●
IB
Input Bias Current
●
3.5
µA
IB Match (Channel-to-Channel) (Note 6)
●
0.4
µA
0.5
3
0.4
µV/°C
µA
IOS
Input Offset Current
AVOL
Large-Signal Gain
VO = ±4.5V,RL = 10k
RL = 1k
●
●
75
22
VCM
Input Voltage Range
Guaranteed by CMRR
●
–3
CMRR
Common Mode Rejection Ratio
VCM = –3V to 4V
●
90
dB
CMRR Match (Channel-to-Channel) (Note 6)
VCM = –3V to 4V
●
95
dB
●
V/mV
V/mV
4
V
Power Supply Rejection Ratio
VS = ±1.5V to ±5V
●
90
dB
PSRR Match (Channel-to-Channel) (Note 6)
VS = ±1.5V to ±5V
●
95
dB
VOL
Output Voltage Swing LOW (Note 8)
No Load
ISINK = 5mA
ISINK = 15mA
●
●
●
50
195
360
mV
mV
mV
VOH
Output Voltage Swing HIGH (Note 8)
No Load
ISOURCE = 5mA
ISOURCE = 15mA
●
●
●
60
205
435
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
Output Leakage Current
●
±35
mA
1.53
mA
µA
●
–95
µA
●
0.3
V
●
1
4.75
V
ENABLE = 4.75V, VO = ±1V
●
1
µA
ns
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k
●
900
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k
●
150
SR
Slew Rate
AV = –1, RL = 1k, VO = –2V to 2V
●
LT6233-10, AV = –10, RL = 1k,
VO = –2V to 2V
●
LT6233, VOUT = 3VP-P
●
FPBW
Full Power Bandwidth (Note 9)
11
105
1.16
µs
V/µs
V/µs
MHz
623345f
8
LT6233/LT6233-10/
LT6234/LT6235
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
LT6233S6, LT6233S6-10
LT6234S8, LT6235GN
LT6234DD
MAX
UNITS
●
●
●
MIN
TYP
700
550
650
µV
µV
µV
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
●
550
µV
VOS TC
Input Offset Voltage Drift (Note 10)
●
3
µV/°C
IB
Input Bias Current
●
4
µA
IB Match (Channel-to-Channel) (Note 6)
●
0.4
µA
0.5
0.5
µA
IOS
Input Offset Current
AVOL
Large-Signal Gain
VO = ±4.5V,RL = 10k
RL = 1k
●
●
68
20
VCM
Input Voltage Range
Guaranteed by CMRR
●
–3
CMRR
Common Mode Rejection Ratio
VCM = –3V to 4V
●
90
dB
CMRR Match (Channel-to-Channel) (Note 6)
VCM = –3V to 4V
●
90
dB
●
V/mV
V/mV
4
V
Power Supply Rejection Ratio
VS = ±1.5V to ±5V
●
90
dB
PSRR Match (Channel-to-Channel) (Note 6)
VS = ±1.5V to ±5V
●
95
dB
VOL
Output Voltage Swing LOW (Note 8)
No Load
ISINK = 5mA
ISINK = 15mA
●
●
●
50
195
370
mV
mV
mV
VOH
Output Voltage Swing HIGH (Note 8)
No Load
ISOURCE = 5mA
ISOURCE = 15mA
●
●
●
70
210
445
mV
mV
mV
ISC
Short-Circuit Current
●
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
1.61
ENABLE = 4.8V
●
●
mA
µA
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
●
–110
µA
VL
ENABLE Pin Input Voltage LOW
●
VH
ENABLE Pin Input Voltage HIGH
●
PSRR
Output Leakage Current
±30
mA
1
0.3
4.8
V
V
ENABLE = 4.8V, VO = ±1V
●
1
µA
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k
●
900
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k
●
160
µs
SR
Slew Rate
95
V/µs
FPBW
Full Power Bandwidth (Note 9)
AV = –1, RL = 1k, VO = –2V to 2V
●
LT6233-10, AV = –10, RL = 1k,
VO = –2V to 2V
●
LT6233, VOUT = 3VP-P
●
10
1.06
V/µs
MHz
623345f
9
LT6233/LT6233-10/
LT6234/LT6235
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 LT6233C/LT6233I the LT6234C/LT6234I, and LT6235C/
LT6235I are guaranteed functional over the temperature range of –40°C
and 85°C.
Note 5: The LT6233C/LT6234C/LT6235C are guaranteed to meet specified
performance from 0°C to 70°C. The LT6233C/LT6234C/LT6235C 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 LT6233I/LT6234I/LT6235I 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 LT6235; between the two amplifiers
of the LT6234. 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
(LT6233/LT6234/LT6235)
Supply Current vs Supply Voltage
(Per Amplifier)
VOS Distribution
2.0
60
VS = 5V, 0V
VCM = V+/2
50 S8
500
VS = 5V, 0V
400
40
30
20
300
TA = 125°C
1.5
OFFSET VOLTAGE (µV)
SUPPLY CURRENT (mA)
NUMBER OF UNITS
Offset Voltage vs Input Common
Mode Voltage
TA = 25°C
1.0
TA = –55°C
0.5
200
100
0
–100
TA = –55°C
–200
–300
10
TA = 25°C
–400
0
50 100 150 200
–200 –150 –100 –50 0
INPUT OFFSET VOLTAGE (µV)
0
0
2
10
12
8
6
TOTAL SUPPLY VOLTAGE (V)
4
623345 GO1
3
TA = –55°C
2
TA = 125°C
TA = 25°C
4
3
2
VCM = 4V
1
VCM = 1.5V
0
–1
–2
10
VS = 5V, 0V
5
INPUT BIAS CURRENT (µA)
INPUT BIAS CURRENT (µA)
5
0
–1
0
4
5
3
2
COMMON MODE VOLTAGE (V)
1
Output Saturation Voltage vs
Load Current (Output Low)
OUTPUT SATURATION VOLTAGE (V)
6
VS = 5V, 0V
1
623345 GO3
Input Bias Current vs Temperature
4
6
623345 GO4
TA = 125°C
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
INPUT COMMON MODE VOLTAGE (V)
623345 GO2
Input Bias Current vs
Common Mode Voltage
6
–500
14
–1
–50
–25
0
50
75
25
TEMPERATURE (°C)
100
125
623345 GO5
VS = 5V, 0V
1
0.1
TA = 125°C
TA = –55°C
0.01
TA = 25°C
0.001
0.0001
0.01
1
10
0.1
LOAD CURRENT (mA)
100
623345 GO6
623345f
10
LT6233/LT6233-10/
LT6234/LT6235
U W
TYPICAL PERFOR A CE CHARACTERISTICS
(LT6233/LT6234/LT6235)
Output Saturation Voltage vs
Load Current (Output High)
1.0
80
VCM = VS/2
0.8
0.6
1
TA = 125°C
0.1
TA = –55°C
0.01
0.4
0.2
0
–0.2
TA = –55°C
–0.4
–0.6
TA = 25°C
0.001
0.01
TA = 25°C
–0.8
0.1
1
10
LOAD CURRENT (mA)
–1.0
100
TA = 125°C
2.5
VS = 3V, 0V
TA = 25°C
–20
RL = 100Ω
–1.0
TA = 25°C
1.0
0.5
RL = 1k
0
RL = 100Ω
–0.5
–1.0
0.5
–2.5
–0.5
623345 G10
40
CHANGE IN OFFSET VOLTAGE (µV)
1.0
0.5
0
–0.5
–1.0
TA = –55°C
–1.5
–2.0
–90
100
TA = 25°C
35
VS = ±5V
30
25
VS = ±2.5V
20
15
5
Total Noise vs Total Source
Resistance
TOTAL NOISE (nV/√Hz)
VS = ±5V
TA = 125°C
4
623345 G12
Warm-Up Drift vs Time
1.5
–5 –4 –3 –2 –1 0 1 2 3
OUTPUT VOLTAGE (V)
623345 G11
Offset Voltage vs Output Current
2.0
RL = 100Ω
–1.0
–2.5
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
OUTPUT VOLTAGE (V)
RL = 1k
0
–2.0
3.0
VS = ±5V
TA = 25°C
1.0
–1.5
2.5
5.0
2.5
1.5
–2.0
1.0
1.5
2.0
OUTPUT VOLTAGE (V)
3.0 3.5 4.0 4.5
POWER SUPPLY VOLTAGE (±V)
2.0
2.0
–1.5
0.5
TA = –55°C
–60
–2.0
0
TA = 125°C
–40
–1.5
–2.5
SOURCING
Open Loop Gain
INPUT VOLTAGE (mV)
INPUT VOLTAGE (mV)
INPUT VOLTAGE (mV)
RL = 1k
–0.5
0
2.5
1.5
0
TA = 25°C
623345 GO9
VS = 5V, 0V
TA = 25°C
2.0
1.5
1.0
TA = 125°C
SINKING
20
Open Loop Gain
2.0
0.5
40
623345 G08
Open Loop Gain
2.5
TA = –55°C
60
–80
1.5
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
TOTAL SUPPLY VOLTAGE (V)
623345 G07
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
VS = ±1.5V
VS = ±2.5V
VCM = 0V
f = 100kHz
UNBALANCED
SOURCE
10 RESISTORS
TOTAL NOISE
RESISTOR NOISE
AMPLIFIER NOISE VOLTAGE
1
10
TA = 25°C
–60
–30
0
30
60
90
OUTPUT CURRENT (mA)
623345 G13
0
0.1
0
10
30
40
20
TIME AFTER POWER-UP (s)
50
623345 G14
10
100
1k
10k
TOTAL SOURCE RESISTANCE (Ω)
100k
623345 G15
623345f
11
LT6233/LT6233-10/
LT6234/LT6235
U W
TYPICAL PERFOR A CE CHARACTERISTICS
(LT6233/LT6234/LT6235)
0.1Hz to 10Hz Output Voltage
Noise
Noise Voltage and Unbalanced
Noise Current vs Frequency
3
3
NOISE VOLTAGE
2
1
1
NOISE CURRENT
0
100
10
100nV
–100nV
0
100k
1k
10k
FREQUENCY (Hz)
623345 G16
GAIN (dB)
60
VS = ±5V
40
30
20
20
0
VS = 3V, 0V
10
0
VS = ±5V
–20
–40
GAIN
–10
–20
100k
1M
PHASE (DEG)
VS = 3V, 0V
40
10M
100M
FREQUENCY (Hz)
1G
PHASE MARGIN
40
–80
30
22
GAIN BANDWIDTH
AV = 1
1
1M
10M
FREQUENCY (Hz)
100M
623345 G22
125
VS = ±5V FALLING
18
16
VS = ±2.5V FALLING
14
VS = ±2.5V RISING
12
2
0
10
12
8
6
TOTAL SUPPLY VOLTAGE (V)
4
10
–55 –35 –15
14
5 25 45 65 85 105 125
TEMPERATURE (°C)
623345 G21
Channel Separation vs Frequency
–40
100
CHANNEL SEPARATION (dB)
AV = 2
95
20
Common Mode Rejection Ratio vs
Frequency
AV = 10
VS = ±5V RISING
623345 G20
COMMON MODE REJECTION RATIO (dB)
OUTPUT IMPEDANCE (Ω)
60
40
50
–60
VS = 5V, 0V
0.1
100k
65
35
5
TEMPERATURE (°C)
26
120
10
–25
AV = –1
24 RF = RG = 1k
60
Output Impedance vs Frequency
100
VS = 3V, 0V
70
50
70
623345 G19
1k
GAIN BANDWIDTH
Slew Rate vs Temperature
PHASE MARGIN (DEG)
50
VS = ±5V
60
623345 G18
80
TA = 25°C
CL = 5pF
RL = 1k
GAIN BANDWIDTH (MHz)
PHASE
60
40
CL = 5pF
80 RL = 1k
VCM = VS/2
70
Gain Bandwidth and Phase Margin
vs Supply Voltage
120
CL = 5pF
RL = 1k
100
VCM = VS/2
80
70
PHASE MARGIN
623345 G17
Open Loop Gain vs Frequency
80
90
40
–55
5s/DIV
60
50
VS = 3V, 0V
50
SLEW RATE (V/µs)
2
VS = ±5V
GAIN BANDWIDTH (MHz)
4
100nV/DIV
4
70
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
623345 G23
–140
100k
1M
10M
FREQUENCY (Hz)
100M
623345 G24
623345f
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
LT6233/LT6233-10/
LT6234/LT6235
U W
TYPICAL PERFOR A CE CHARACTERISTICS
(LT6233/LT6234/LT6235)
Power Supply Rejection Ratio vs
Frequency
80
VS = 5V, 0V
45 AV = 2
RS = 10Ω
40
POSITIVE SUPPLY
60
40
50
VS = 5V, 0V
45 AV = 1
NEGATIVE SUPPLY
20
0
35
RS = 20Ω
30
25
20
RS = 50Ω
RL = 50Ω
15
10M
5
0
100
CAPACITIVE LOAD (pF)
10
100M
1000
400
350
500Ω
SETTLING TIME (ns)
SETTLING TIME (ns)
–
VOUT
+
VIN
250
500Ω
200
1mV
10mV
150
1mV
10mV
100
–
VIN
300
Maximum Undistorted Output
Signal vs Frequency
VS = ±5V
TA = 25°C
AV = –1
500Ω
VOUT
+
250
200
1mV
1mV
10mV
150
10mV
100
–4
–3
–2
–1
1
2
0
OUTPUT STEP (V)
3
50
4
–4
–3
–2
–1
1
2
0
OUTPUT STEP (V)
623345 G28
–80
RL = 1k, 2ND
6
5
4
V = ±5V
3 T S = 25°C
A
HD2, HD3 < –40dBc
2
100k
1M
10k
FREQUENCY (Hz)
10M
623345 G31
10M
Distortion vs Frequency
–70
VS = ±2.5V
A =2
–40 VV = 2V
(P–P)
OUT
RL = 100Ω, 2ND
–60
RL = 100Ω, 3RD
RL = 1k, 3RD
–80
–90
–90
100k
1M
FREQUENCY (Hz)
DISTORTION (dBc)
RL = 100Ω, 3RD
–100
10k
7
–30
VS = ±5V
AV = 1
–50 VOUT = 2V(P–P)
RL = 1k, 3RD
AV = –1
8
623345 G30
–40
VS = ±2.5V
AV = 1
–50 VOUT = 2V(P–P)
RL = 100Ω, 2ND
4
AV = 2
9
Distortion vs Frequency
Distortion vs Frequency
–60
3
10
623345 G29
–40
–100
10k
1000
623345 G27
Settling Time vs Output Step
(Inverting)
VS = ±5V
TA = 25°C
350 AV = 1
300
100
CAPACITIVE LOAD (pF)
10
623345 G26
400
DISTORTION (dBc)
15
OUTPUT VOLTAGE SWING (VP–P)
1M
100k
FREQUENCY (Hz)
RS = 50Ω
RL = 50Ω
20
10
Settling Time vs Output Step
(Non-Inverting)
–70
25
5
DISTORTION (dBc)
10k
RS = 20Ω
30
10
623345 G25
50
35
0
1k
RS = 10Ω
40
OVERSHOOT (%)
100
Series Output Resistance and
Overshoot vs Capacitive Load
50
VS = 5V, 0V
TA = 25°C
VCM = VS/2
OVERSHOOT (%)
POWER SUPPLY REJECTION RATIO (dB)
120
Series Output Resistance and
Overshoot vs Capacitive Load
RL = 100Ω, 2ND
–50
–60
RL = 1k, 3RD
RL = 100Ω, 3RD
–70
–80
RL = 1k, 2ND
RL = 1k, 2ND
–90
100k
1M
FREQUENCY (Hz)
10M
623345 G32
–100
10k
100k
1M
FREQUENCY (Hz)
10M
623345 G33
623345f
13
LT6233/LT6233-10/
LT6234/LT6235
U W
TYPICAL PERFOR A CE CHARACTERISTICS
(LT6233/LT6234/LT6235)
Large Signal Response
Distortion vs Frequency
Small Signal Response
–30
RL = 100Ω, 2ND
–60
2V
RL = 1k, 3RD
RL = 100Ω, 3RD
–70
50mV/DIV
–50
1V/DIV
DISTORTION (dBc)
VS = ±5V
AV = 2
–40 V
OUT = 2V(P–P)
0V
0V
–2V
–80
RL = 1k, 2ND
VS = ±2.5V
AV = –1
RL = 1k
–90
–100
10k
100k
1M
FREQUENCY (Hz)
VS = ±2.5V
AV = 1
RL = 1k
200ns/DIV
623345 G35
200ns/DIV
623345 G36
10M
623345 G34
Large Signal Response
Output Overdrive Recovery
–5V
VS = ±5V
AV = 1
RL = 1k
VIN
(1V/DIV)
0V
0V
VOUT
(2V/DIV)
2V/DIV
5V
0V
VS = ±2.5V
AV = 3
200ns/DIV
200ns/DIV
623345 G37
623345 G38
(LT6233) ENABLE Characteristics
Supply Current vs ENABLE Pin
Voltage
ENABLE Pin Current vs ENABLE
Pin Voltage
35
TA = 125°C
TA = –55°C
30
1.0
TA = –55°C
0.8
0.6
0.4
0.2
0
25
VS = ±2.5V
AV = 1
TA = 25°C
–2.0
0
1.0
–1.0
PIN VOLTAGE (V)
2.0
623345 G39
0V
20
TA = 125°C
15
0.5V
10
5
VS = ±2.5V
5V
VOUT
TA = 25°C
ENABLE PIN CURRENT (µA)
SUPPLY CURRENT (mA)
1.2
ENABLE Pin Response Time
ENABLE PIN
1.4
0
–2.0
0
1.0
–1.0
PIN VOLTAGE (V)
2.0
0V
VS = ±2.5V
VIN = 0.5V
AV = 1
RL = 1k
200µs/DIV
623345 G41
623345 G40
623345f
14
LT6233/LT6233-10/
LT6234/LT6235
U W
TYPICAL PERFOR A CE CHARACTERISTICS
(LT6233-10)
Gain Bandwidth and Phase Margin
vs Temperature
200
VS = ±5V
GAIN BANDWIDTH
300
VS = 3V, 0V
250
200
VS = ±5V
70
PHASE MARGIN
VS = 3V, 0V
–50
75
50
25
TEMPERATURE (°C)
–25
0
100
70
100
VS = ±2.5V RISING
60
60
40
50
20
40
125
20
0
VS = 3V, 0V 40
30
20
VS = 3V, 0V
20
0
10
–20
VS = ±5V
0
–40
–10
TA = 25°C
AV = 10
375 CL = 5pF
RL = 1k
300
GAIN BANDWIDTH
225
100
PHASE MARGIN
50
–60
–20
100k
–80
1M
10M
100M
FREQUENCY (Hz)
1G
0
2
4
8
10
6
TOTAL SUPPLY VOLTAGE (V)
623345 G45
60
40
20
0
10k
100k
1M
10M
FREQUENCY (Hz)
100M
1G
623345 G48
200
150
100
50
0
0
0
1000
400
800
600
TOTAL RESISTOR LOAD (Ω)
(INCLUDES FEEDBACK R) 623345 G47
200
2nd and 3rd Harmonic Distortion vs
Frequency
–30
VS = ±2.5V
A = 10
–40 VV = 2V
(P–P)
OUT
10
9
OUTPUT VOLTAGE SWING (VP–P)
COMMON MODE REJECTION RATIO (dB)
80
250
Maximum Undistorted Output vs
Frequency
VS = 5V, 0V
VCM = VS/2
100
12
300
623345 G46
Common Mode Rejection Ratio vs
Frequency
120
ASV = ±5V
10
V
TA = 25°C
RF = 1k
RG = 100
350
8
DISTORTION (dBc)
GAIN (dB)
60
PHASE (DEG)
GAIN
40
Gain Bandwidth vs Resistor Load
400
450
AV = 10
CL = 5pF
100
RL = 1k
VCM = VS/2 80
7
6
5
4
3
2 VS = ±5V
TA = 25°C
1 AV = 10
HD2, HD3 ≤ 40dBc
0
100k
1M
10k
FREQUENCY (Hz)
10000
623345 G44
PHASE MARGIN (DEG)
VS = ±5V
50
100
1000
CAPACITIVE LOAD (pF)
10
5 25 45 65 85 105 125
TEMPERATURE (°C)
Gain Bandwidth and Phase Margin
vs Supply Voltage
GAIN BANDWIDTH (MHz)
60
RS = 50Ω
623345 G43
120
PHASE
30
10
0
–55 –35 –15
Open Loop Gain vs Frequency
70
RS = 20Ω
40
VS = ±2.5V FALLING
623345 G42
80
RS = 10Ω
50
120
80
VS = 5V, 0V
AV = 10
60
VS = ±5V FALLING
GAIN BANDWIDTH (MHz)
350
PHASE MARGIN (DEG)
GAIN BANDWIDTH (MHz)
400
AV = –10
180 RF = 1k
RG = 100Ω
160
VS = ±5V RISING
140
OVERSHOOT (%)
AV = 10
SLEW RATE (V/µs)
450
Series Output Resistance and
Overshoot vs Capacitive Load
Slew Rate vs Temperature
–50
RL = 100Ω, 3RD
–60
RL = 1k, 3RD
RL = 100Ω, 2ND
RL = 1k, 2ND
–70
–80
–90
10M
–100
10k
100k
1M
FREQUENCY (Hz)
10M
623345 G50
623345 G49
623345f
15
LT6233/LT6233-10/
LT6234/LT6235
U W
TYPICAL PERFOR A CE CHARACTERISTICS
(LT6233-10)
2nd and 3rd Harmonic Distortion vs
Frequency
Large Signal Response
Output-Overload Recovery
–30
RL = 100Ω, 3RD
RL = 100Ω, 2ND
–60
0V
0V
0V
RL = 1k, 3RD
–70
–80
–90
–100
10k
VOUT
(2V/DIV)
RL = 1k, 2ND
VIN
(0.5V/DIV)
–50
VOUT
(2V/DIV)
DISTORTION (dBc)
VS = ±5V
A = 10
–40 VV = 2V
(P–P)
OUT
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
623345 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
20MHz
2MHz/DIV
623345 G54
623345 G55
623345f
16
LT6233/LT6233-10/
LT6234/LT6235
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
623345 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 LT6233/LT6234/
LT6235 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 1.9nV/√Hz to
2.6nV/√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 LT6233/LT6234/
LT6235, 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
623345 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 LT6233/LT6234/LT6235 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 LT6233/LT6234/LT6235 is equivalent to that of a 225Ω 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 ≤ 225Ω.
623345f
17
LT6233/LT6233-10/
LT6234/LT6235
U
W
U
U
APPLICATIO S I FOR ATIO
With RS + RG||RFB = 225Ω the total noise of the
amplifier is:
eN=√(1.9nV)2+(1.9nV)2 = 2.69nV/√Hz
Below this resistance value, the amplifier dominates the
noise, but in the region between 225Ω and about 30k, the
noise is dominated by the resistor thermal noise. As the
total resistance is further increased beyond 30k, 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 LT6233/
LT6234/LT6235 have an eN • √ISUPPLY product of only 2.1
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 LT6233 and LT6233-10 include 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 LT6233 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.
623345f
18
LT6233/LT6233-10/
LT6234/LT6235
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
LT6233
+
C3
0.1µF
R4
10k
VOUT
EN
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 = 6µVRMS INPUT REFERRED
IS = 1.5mA FOR V+ = 5V
3
–7
100k
623345 F03
1M
FREQUENCY (Hz)
10M
623345 F04
Low Power, Low Noise, Single Supply, Instrumentation
Amplifier with Gain = 100
R1
30.9Ω
C2
2200pF
R2
V+ 511Ω
C8
68pF
–
U1
LT6233-10
+
VIN1
R15
88.7Ω
EN
C1
1µF
V+
R10
511Ω
R13
2k
–
R6
511Ω
U3
LT6233
+
R3
30.9Ω
R5
511Ω
R4
V+ 511Ω
C3
1µF
R12
511Ω
R14
2k
–
U2
LT6233-10
+
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 2.5MHz
EN = 10µVRMS INPUT REFERRED
IS = 4.7mA FOR VS = 5V, 0V
R1 = R3
R2 = R4
R10 = R12
R15 = R16
623345 F05
623345f
19
LT6233/LT6233-10/
LT6234/LT6235
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
623345f
20
LT6233/LT6233-10/
LT6234/LT6235
U
PACKAGE DESCRIPTIO
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698)
R = 0.115
TYP
5
0.38 ± 0.10
8
0.675 ±0.05
3.5 ±0.05
1.65 ±0.05
2.15 ±0.05 (2 SIDES)
3.00 ±0.10
(4 SIDES)
PACKAGE
OUTLINE
1.65 ± 0.10
(2 SIDES)
PIN 1
TOP MARK
(DD8) DFN 0203
0.28 ± 0.05
0.200 REF
0.50
BSC
2.38 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
0.75 ±0.05
0.00 – 0.05
4
0.28 ± 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. ALL DIMENSIONS ARE IN MILLIMETERS
3. 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
4. EXPOSED PAD SHALL BE SOLDER PLATED
623345f
21
LT6233/LT6233-10/
LT6234/LT6235
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
623345f
22
LT6233/LT6233-10/
LT6234/LT6235
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 TYP
RECOMMENDED SOLDER PAD LAYOUT
1
.015 ± .004
× 45°
(0.38 ± 0.10)
.007 – .0098
(0.178 – 0.249)
2 3
4
5 6
7
.053 – .068
(1.351 – 1.727)
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)
.0250
(0.635)
BSC
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
GN16 (SSOP) 0502
623345f
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
LT6233/LT6233-10/
LT6234/LT6235
U
TYPICAL APPLICATIO S
The LT6233 is applied as a transimpedance amplifier with
an I-to-V conversion gain of 10kΩ set by R1.␣ The LT6233
is ideally suited to this application because of its low input
offset voltage and␣ current, and its low noise.␣ This is because the 10k resistor has an inherent thermal noise of
13nV/√Hz or 1.3pA/√Hz at room temperature,␣ while the
LT6233␣ contributes only 2nV and 0.8pA /√Hz.␣ So, with
respect to both voltage and current noises, the LT6233 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 • 10k. C1 ensures stability and good
settling characteristics.␣ Output offset was measured
at␣ better than 500µV, so low in part because R2 serves to
cancel the DC effects of bias current.␣ Output noise was
measured at below 1mVP–P on a 20MHz measurement
bandwidth, with C2 shunting R2’s thermal noise.␣ As shown
in the scope photo, the rise time is 45ns, indicating a signal
bandwidth of 7.8MHz.
Low Power Avalanche Photodiode Transimpedance Amplifier
IS = 1.2mA
≈ 200V BIAS
Photodiode Amplifier Time Domain Response
C1
2.7pF
WWW.ADVANCEDPHOTONIX.COM
50mV/DIV
ADVANCED PHOTONIX
012-70-62-541
R1
10k
5V
–
R2
10k
LT6233
+
100ns/DIV
–5V
ENABLE
623345 TA02b
623345 TA02a
C2
0.1µF
OUTPUT OFFSET = 500µV TYPICAL
BANDWIDTH = 7.8MHz
OUTPUT NOISE = 1mVP–P (20MHz 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
623345f
24
Linear Technology Corporation
LT/TP 1003 1K • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2003