Datasheet

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623012fc

LT6230/LT6230-10

LT6231/LT6232

Typical applicaTion

FeaTures DescripTion

215MHz, Rail-to-Rail Output,

1.1nV/√Hz, 3.5mA Op Amp Family

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 e

• √I

SUPPLY

product of 1.9 per ampliﬁer

is among the most noise efﬁcient of any op amp.

The LT6230/LT6230-10 are 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.

Low Noise Low Power Instrumentation Ampliﬁer

applicaTions

Low Noise Voltage: 1.1nV/√Hz

Low Supply Current: 3.5mA/Amp Max

Low Offset Voltage: 350µV Max

Gain Bandwidth Product:

LT6230: 215MHz; A

≥ 1

LT6230-10: 1450MHz; A

≥ 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 a Low Proﬁle (1mm)

ThinSOT™ Package

Dual LT6231 in 8-Pin SO and Tiny DFN Packages

LT6232 in a 16-Pin SSOP Package

Ultrasound Ampliﬁers

Low Noise, Low Power Signal Processing

Active Filters

Driving A/D Converters

Rail-to-Rail Buffer Ampliﬁers

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.

–

499Ω

LT6202

OUT

–

1/2 LT6231

–

1/2 LT6231

499Ω

196Ω

10Ω

196Ω

499Ω

623012 TA01a

= 40

BW = 5.1MHz

= ±1.5V to ±5V

= 10mA

EN = 5.8µV

RMS

INPUT REFERRED,

MEASUREMENT BW = 8MHz

–

Noise Voltage and Unbalanced

Noise Current vs Frequency

FREQUENCY (Hz)

NOISE VOLTAGE (nV/√Hz)

10 1k 10k 100k

623012 TA01b

100

= ±2.5V

= 25°C

= 0V

NOISE VOLTAGE

NOISE CURRENT

UNBALANCED NOISE CURRENT (pA/√Hz)

Summary of content (24 pages)

PAGE 1
LT6230/LT6230-10 LT6231/LT6232 215MHz, Rail-to-Rail Output, 1.1nV/√Hz, 3.5mA Op Amp Family Features Description Low Noise Voltage: 1.1nV/√Hz n Low Supply Current: 3.5mA/Amp Max n Low Offset Voltage: 350µV Max n Gain Bandwidth Product: LT6230: 215MHz; AV ≥ 1 LT6230-10: 1450MHz; AV ≥ 10 n Wide Supply Range: 3V to 12.
PAGE 2
LT6230/LT6230-10 LT6231/LT6232 Absolute Maximum Ratings (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).....................
PAGE 3
LT6230/LT6230-10 LT6231/LT6232 Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT6230CS6#PBF LT6230CS6#TRPBF LTAFJ 6-Lead Plastic TS0T-23 0°C to 70°C LT6230IS6#PBF LT6230IS6#TRPBF LTAFJ 6-Lead Plastic TS0T-23 –40°C to 85°C LT6230CS6-10#PBF LT6230CS6-10#TRPBF LTAFK 6-Lead Plastic TS0T-23 0°C to 70°C LT6230IS6-10#PBF LT6230IS6-10#TRPBF LTAFK 6-Lead Plastic TS0T-23 –40°C to 85°C LT6231CS8#PBF LT6230CS8#TRPBF 6231 8-Lead
PAGE 4
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 MIN TYP PSRR 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 Minimum Supply Voltage (Note 7) MAX 3 UNITS V VOL Output Voltage Swing Low (Note 8) No Load ISINK = 5mA VS = 5V, ISINK = 20mA VS = 3.
PAGE 5
LT6230/LT6230-10 LT6231/LT6232 Electrical Characteristics The l denotes the specifications which apply over the 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 LT6230CS6, LT6230CS6-10 LT6231CS8, LT6232CGN LT6231CDD MIN Input Offset Voltage Match (Channel-to-Channel) (Note 6) VOS TC IB Input Offset Voltage Drift (Note 10) µV µV µV l 800 µV 0.
PAGE 6
LT6230/LT6230-10 LT6231/LT6232 Electrical Characteristics The l denotes the specifications which apply over the –40°C < TA < 85°C temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, ENABLE = 0V, unless otherwise noted.
PAGE 7
LT6230/LT6230-10 LT6231/LT6232 Electrical Characteristics 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 MIN Input Offset Voltage Match (Channel-to-Channel) (Note 6) IB Input Bias Current IB Match (Channel-to-Channel) (Note 6) IOS Input Offset Current TYP MAX UNITS 100 50 75 500 350 450 µV µV µV 100 600 µV 5 10 µA 0.1 0.9 µA 0.1 0.
PAGE 8
LT6230/LT6230-10 LT6231/LT6232 Electrical Characteristics The l denotes the specifications which apply over the 0°C < TA < 70°C temperature range. VS = ±5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted.
PAGE 9
LT6230/LT6230-10 LT6231/LT6232 Electrical Characteristics The l denotes the specifications which apply over the –40°C < TA < 85°C temperature range. VS = ±5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted.
PAGE 10
LT6230/LT6230-10 LT6231/LT6232 Electrical Characteristics 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.
PAGE 11
LT6230/LT6230-10 LT6231/LT6232 Typical Performance Characteristics (LT6230/LT6231/LT6232) Output Saturation Voltage vs Load Current (Output High) 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 2 2.5 3.5 4 4.5 5 3 1.5 POWER SUPPLY VOLTAGE (±V) 623012 G08 623012 GO9 1.0 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.
PAGE 12
LT6230/LT6230-10 LT6231/LT6232 Typical Performance Characteristics (LT6230/LT6231/LT6232) Noise Voltage and Unbalanced Noise Current vs Frequency 4 3 3 NOISE CURRENT 2 2 1 1 100 10 CL = 5pF RL = 1k VCM = VS/2 100nV –100nV PHASE GAIN (dB) VS = ±5V 40 30 20 20 0 VS = ±5V 10 –20 GAIN 0 –40 VS = 3V, 0V –10 –20 100k 1M 10M 100M FREQUENCY (Hz) 1G 40 220 200 GAIN BANDWIDTH 180 160 –80 140 95 AV = 2 AV = 1 0.
PAGE 13
LT6230/LT6230-10 LT6231/LT6232 Typical Performance Characteristics (LT6230/LT6231/LT6232) Power Supply Rejection Ratio vs Frequency VS = 5V, 0V TA = 25°C VCM = VS/2 80 POSITIVE SUPPLY 60 NEGATIVE SUPPLY 40 50 50 40 40 VS = 5V, 0V 45 AV = 2 35 RS = 10Ω 30 25 RS = 20Ω 20 15 RS = 50Ω RL = 50Ω 10 20 OVERSHOOT (%) 100 1M 100k FREQUENCY (Hz) 10k 10M 100M 100 CAPACITIVE LOAD (pF) 10 – VOUT 500Ω 100 1mV 1mV 50 0 –4 –3 500Ω 150 2 1 0 OUTPUT STEP (V) –2 –1 – VIN VOUT + 100 1mV
PAGE 14
LT6230/LT6230-10 LT6231/LT6232 Typical Performance Characteristics (LT6230/LT6231/LT6232) Distortion vs Frequency Large-Signal Response Small-Signal Response –40 2V RL = 100Ω, 2ND RL = 1k, 3RD –70 50mV/DIV –60 RL = 100Ω, 3RD 1V/DIV DISTORTION (dBc) VS = ±5V AV = 2 –50 VOUT = 2VP-P 0V 0V –2V –80 –90 RL = 1k, 2ND –100 10k 100k 1M FREQUENCY (Hz) 10M 623012 G35 200ns/DIV VS = ±2.5V AV = –1 RL = 1k VS = ±2.
PAGE 15
LT6230/LT6230-10 LT6231/LT6232 Typical Performance Characteristics (LT6230-10) Gain Bandwidth and Phase Margin vs Temperature 600 1100 VS = 3V, 0V 900 80 VS = ±5V 70 PHASE MARGIN 60 –50 –25 0 50 75 25 TEMPERATURE (°C) 100 400 VS = ±5V RISING 300 40 100 –55 –35 –15 PHASE 20 1M –20 VS = ±5V AV = 10 CL = 5pF RL = 1k VCM = VS/2 –10 100k 0 –40 TA = 25°C AV = 10 1450 CL = 5pF RL = 1k 1200 GAIN BANDWIDTH 950 100 PHASE MARGIN 50 –60 10M 100M FREQUENCY (Hz) 1G –80 0 2 4 8 10 6 TO
PAGE 16
LT6230/LT6230-10 LT6231/LT6232 Typical Performance Characteristics (LT6230-10) 2nd and 3rd Harmonic Distortion vs Frequency Large-Signal Response Output-Overload Recovery –40 RL = 100Ω, 3RD RL = 100Ω, 2ND –70 0V RL = 1k, 3RD –80 RL = 1k, 2ND –90 –100 10k VIN VOUT 0.
PAGE 17
LT6230/LT6230-10 LT6231/LT6232 Applications Information Amplifier Characteristics 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 handle transient currents due to amplifier slew rate overdrive and clipping without protection resistors. Figure 1 is a simplified schematic of the LT6230/LT6231/ LT6232, which has a pair of low noise input transistors Q1 and Q2.
PAGE 18
LT6230/LT6230-10 LT6231/LT6232 Applications Information 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.
PAGE 19
LT6230/LT6230-10 LT6231/LT6232 Typical Applications Single Supply, Low Noise, Low Power, Bandpass Filter with Gain = 10 R1 732Ω Frequency Response Plot of Bandpass Filter C2 47pF f0 = V+ 23 1 = 1MHz 2πRC C = √C1C2, R = R1 = R2 VIN R2 732Ω ( 0.1µF R3 10k – LT6230 + C3 0.1µF R4 10k VOUT EN ) f0 = 732Ω MHz, MAXIMUM f0 = 1MHz R f–3dB = f0 2.5 AV = 20dB at f0 EN = 4µVRMS INPUT REFERRED IS = 3.
PAGE 20
LT6230/LT6230-10 LT6231/LT6232 Package Description 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) NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3.
PAGE 21
LT6230/LT6230-10 LT6231/LT6232 Package Description DD Package 8-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698 Rev C) 0.70 ±0.05 3.5 ±0.05 1.65 ±0.05 2.10 ±0.05 (2 SIDES) PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC 2.38 ±0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED PIN 1 TOP MARK (NOTE 6) 0.200 REF 3.00 ±0.10 (4 SIDES) R = 0.125 TYP 5 0.40 ± 0.10 8 1.65 ± 0.10 (2 SIDES) 0.75 ±0.05 4 0.25 ± 0.05 1 (DD8) DFN 0509 REV C 0.50 BSC 2.
PAGE 22
LT6230/LT6230-10 LT6231/LT6232 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 7 8 .245 MIN .160 ±.005 5 6 .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) 3 2 4 .053 – .069 (1.346 – 1.752) .008 – .010 (0.203 – 0.254) .004 – .010 (0.101 – 0.254) 0°– 8° TYP .016 – .050 (0.
PAGE 23
LT6230/LT6230-10 LT6231/LT6232 Revision History (Revision history begins at Rev C) REV DATE DESCRIPTION PAGE NUMBER C 1/11 Updated ENABLE Pin section in Applications Information 18 623012fc 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.
PAGE 24
LT6230/LT6230-10 LT6231/LT6232 Typical Applications 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.