Datasheet

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LTC6255/LTC6256/LTC6257

625567fb

ApplicAtions

Micropower Active Filters

Portable Instrumentation

Battery or Solar Powered Systems

Automotive Electronics

Gain Bandwidth Product: 6.5MHz

–3dB Bandwidth (A

= +1): 4.5MHz

Low Quiescent Current: 65µA

Stable for Capacitive Load Up to 100nF

Offset Voltage: 350µV Maximum

Rail-to-Rail Input and Output

Supply Voltage Range: 1.8V to 5.25V

Input Bias Current: 50nA Maximum

CMRR/PSRR: 100dB/100dB

Shutdown Current: 7µA Maximum

Operating Temperature Range: –40°C to 125°C

Single in 6-Lead TSOT-23 Package

Dual in 8-Lead MS8, MS10, TS0T-23, 2mm × 2mm

Thin DFN Packages

Quad in MS16 Package

typicAl ApplicAtion

Description

6.5MHz, 65µA Power

Efficient Rail-to-Rail I/O

Op Amps

The LTC

6255/LTC6256/LTC6257 are single/dual/quad

operational amplifiers with low noise, low power, low

supply voltage, and rail-to-rail inputs and outputs. They

are unity gain stable with capacitive load up to 100nF.

They feature 6.5MHz gain-bandwidth product, 1.8V/µs

slew rate while consuming only 65µA of supply current

per amplifier operating on supply voltages ranging from

1.8V to 5.25V. The combination of low supply current,

low supply voltage, high gain bandwidth product and low

noise makes the LTC6255 family unique among rail-to-rail

input/output op amps with similar supply current. These

operational amplifiers are ideal for low power and low

noise applications.

For applications that require power-down, the LTC6255

and LTC6256 in S6 and MS10 packages offer shutdown

which reduces the current consumption to 7µA maximum.

The LTC6255 family can be used as plug-in replacements

for many commercially available op amps to reduce power

and improve input/output range and performance.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

Over-The-Top is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

Low Power, Low Distortion ADC Driver

FeAtures

LTC6255 Driving LTC2361 ADC

= –1dBFS, 5kHz

= 125kSps

SNR = 72.5dB

SFDR = 89dB

ACQ

= 5µs

CONV

= 3µs

MAGNITUDE (dB)

FREQUENCY (kHz)

625567 TA01b

0 10 20 30 40 50 60

–30

–50

–10

–110

–20

–40

–60

–70

–80

–90

–100

–

LTC6255

5mV TO 2V

3.3V

10k

22pF

6.34k, 1%

324Ω

470pF

NPO

GND

SDO

SCK

SUPPLY

= 540µA TOTAL AT 125kSps

REF

625567 TA01a

LTC2361

Summary of content (24 pages)

PAGE 1
LTC6255/LTC6256/LTC6257 6.5MHz, 65µA Power Efficient Rail-to-Rail I/O Op Amps Description Features n n n n n n n n n n n n n n Gain Bandwidth Product: 6.5MHz –3dB Bandwidth (AV = +1): 4.5MHz Low Quiescent Current: 65µA Stable for Capacitive Load Up to 100nF Offset Voltage: 350µV Maximum Rail-to-Rail Input and Output Supply Voltage Range: 1.8V to 5.
PAGE 2
LTC6255/LTC6256/LTC6257 Absolute Maximum Ratings (Note 1) Supply Voltage: V+ – V–............................................5.5V Input Voltage .................................... V– – 0.2 to V+ + 0.2 Input Current: +IN, –IN, SHDN (Note 2)................ ±10mA Output Current: OUT............................................ ±20mA Output Short-Circuit Duration (Note 3)............. Indefinite Operating Temperature Range (Note 4) LTC6255C/LTC6256C/LTC6257C..........–40°C to 85°C LTC6255I/LTC6256I/LTC6257I..
PAGE 3
LTC6255/LTC6256/LTC6257 Order Information Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC6255CS6#TRMPBF LTC6255CS6#TRPBF LTFFT 6-Lead Plastic TSOT-23 0°C to 70°C LTC6255IS6#TRMPBF LTC6255IS6#TRPBF LTFFT 6-Lead Plastic TSOT-23 –40°C to 85°C LTC6255HS6#TRMPBF LTC6255HS6#TRPBF LTFFT 6-Lead Plastic TSOT-23 –40°C to 125°C LTC6256CTS8#TRMPBF LTC6256CTS8#TRPBF LTFFW 8-Lead Plastic TSOT-23 0°C to 70°C LTC6256ITS8#TRMPBF LTC6256ITS
PAGE 4
LTC6255/LTC6256/LTC6257 5V Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VSUPPLY = 5V, VCM = VOUT = VSUPPLY/2, CL = 10pF, VSHDN is unconnected. SYMBOL PARAMETER CONDITIONS CIN Input Capacitance Differential Common Mode CMRR Common Mode Rejection Ratio VCM = 0.3V to 3.5V IVR Input Voltage Range PSRR Power Supply Rejection Ratio VCM = 0.4V, VS Ranges from 1.
PAGE 5
LTC6255/LTC6256/LTC6257 1.8V Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VSUPPLY = 1.8V, VCM = VOUT = 0.4V, CL = 10pF, VSHDN is unconnected. SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS VCM MIN TYP MAX UNITS –350 –700 100 l 350 700 µV µV –350 –700 100 l 350 700 µV µV = V– + 0.3V VCM = V+ – 0.
PAGE 6
LTC6255/LTC6256/LTC6257 1.8V Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VSUPPLY = 1.8V, VCM = VOUT = 0.4V, CL = 10pF, VSHDN is unconnected.
PAGE 7
LTC6255/LTC6256/LTC6257 Typical Performance Characteristics Input VOS Histogram 140 VS = ±2.5V VCM = 0V NUMBER OF UNITS 100 50 100 80 60 40 20 0 –1000 20 500 0 –1000 1000 –600 625567 G01 500 H-GRADE INDUSTRIAL COMMERCIAL 16 VS = ±2.5V VCM = 0V 10 8 –200 200 VOS (µV) 600 625567 G03 VOS vs Common Mode Voltage 500 VCM = 0.4V 300 300 200 200 100 100 0 –100 0 –100 6 –200 –200 4 –300 –300 2 –400 –400 0 –3.5 –500 1.8 –2.5 –1.5 –0.5 0 0.5 DISTRIBUTION (µV/°C) 1.5 2.
PAGE 8
LTC6255/LTC6256/LTC6257 Typical Performance Characteristics Input Bias Current vs Supply Voltage 50 15 10 5 0 –5 +IN –10 –15 –IN –20 100 VS = ±2.5V 40 30 20 10 0 –10 –20 VCM = –2V –30 –50 –40 4.8 10 60 TEMPERATURE (°C) 60 VS = 1.8V, 0V 40 20 0 –40 –15 10 35 60 85 TEMPERATURE (°C) 110 –0.05 –0.10 –0.15 –0.20 –0.25 125°C, VS = 5V 85°C, VS = 5V 25°C, VS = 5V –40°C, VS = 5V –0.30 –0.35 0 1 2 3 LOAD CURRENT (mA) 4 100 MAXIMUM SINKING CURRENT (mA) VCM = 0.
PAGE 9
LTC6255/LTC6256/LTC6257 300 VS = ±2.5V VCM = 0V 250 200 150 100 50 0 1 10 100 1k FREQUENCY (Hz) 10k 100k Wide Band Noise Voltage Density vs Frequency VS = ±2.5V 70 VCM = 0V 60 50 40 30 20 10 0 0 2M 4M FREQUENCY (Hz) 6M 625567 G19 625567 G20 Total Harmonic Distortion and Noise 1 1 0.01 0.1 1kHz 1 VOUTP-P (V) 10 625567 G22 0.001 0.01 500Hz 0.
PAGE 10
LTC6255/LTC6256/LTC6257 Typical Performance Characteristics Common Mode Rejection Ratio vs Frequency Slew Rate vs Supply Voltage 150 2.5 Power Supply Rejection Ratio vs Frequency 150 VS = ±2.5V VCM = 0V V+, VS = 1.8V, 0V V+, VS = 5V, 0V V–, VS = 1.8V, 0V V–, VS = 5V, 0V RISING 100 1.5 PSSR (dB) FALLING 1.0 100 CMMR (dB) 50 V – = 0V 0.5 S VSTEP = VS+ – 1V AV = 1 RF = RG = 10kΩ 0 1.5 2.5 3.5 4.5 VS+, SUPPLY VOLTAGE (V) 0 5.5 50 1k 0.
PAGE 11
LTC6255/LTC6256/LTC6257 Typical Performance Characteristics Large-Signal Response Small-Signal Response VS = ±0.9V AV = 1 RLOAD = 10kΩ 0.04 0.03 VOLTAGE (V) 0.04 0 –0.01 –0.02 CLOAD = 10pF CLOAD = 100pF CLOAD = 1nF CLOAD = 10nF –0.03 –0.04 0 20 40 60 TIME (µs) 80 0.5 100 0.02 0 –0.5 –0.03 –2.0 –0.04 0 20 40 60 TIME (µs) 80 VS = 1.8V, 0V 70 VCM = 0.4V AV = 10 1 AV = 1 0.1 1k 10k 625567 G34 200 400 600 TIME (µs) 800 60 90 VS = 5V, 0V 80 VCM = 0.
PAGE 12
LTC6255/LTC6256/LTC6257 Pin Functions V–: Negative Power Supply. It is normally tied to ground. It can also be tied to a voltage other than ground as long as the voltage between V+ and V– is from 1.8V to 5.25V. If it is not connected to ground, bypass it with a capacitor of 0.1µF as close to the part as possible. –IN: Inverting Input of the Amplifier. Voltage range of this pin can go from V– – 0.1V to V+ + 0.1V. +IN: Non-Inverting Input of Amplifier. This pin has the same voltage range as –IN.
PAGE 13
LTC6255/LTC6256/LTC6257 Operation The LTC6255 family input signal range extends beyond the negative and positive power supplies. The output can even extend all the way to the negative supply with the proper external pull-down current source. Figure 1 depicts a Simplified Schematic of the amplifier. The input stage is comprised of two differential amplifiers, a PNP stage Q1/Q2 and NPN stage Q3/Q4 that are active over different ranges of common mode input voltage.
PAGE 14
LTC6255/LTC6256/LTC6257 Applications Information the negative supply to 0.2V below the positive supply, the low input bias current allows the amplifiers to be used in applications with high resistance sources. Ground Sensing and Rail to Rail Output The LTC6255 family has excellent output drive capability, delivering over 10mA of output drive current. The output stage is a rail-to-rail topology that is capable of swinging to within 30mV of either rail.
PAGE 15
LTC6255/LTC6256/LTC6257 Typical Applications Frequency Response of 40dB Gain Amplifier 200kHz 130µA Gain-of-100 Amplifier 50 40 0.9V 30 + 20 1/2 LTC6256 + – 1/2 LTC6256 GAIN (dB) VIN VOUT – –0.9V 10 0 –10 –20 90.9k 10k 90.9k 10k –30 –40 625567 F03a –50 10 100 1k 10k 100k FREQUENCY (Hz) 1M 10M 625567 F03b Figure 3.
PAGE 16
LTC6255/LTC6256/LTC6257 Typical Applications Table 1. V+ 0.1µF R2 R1 VIN R3 C1 10µF V+ – 3 + 5 2 R1= 625567 F05 C2   1−  1− 4 Q2 [Gain + 1]   C1 4 π Q fO C2 1 4 π R2 C1 C2 fO 2 2 R2 R1 R2 Gain C1> 4 Q2 (Gain + 1) C2 Maximum f–3dB = 100kHz and Maximum Gain = SHDN 100k RC Component Equations Gain = 1 LTC6255 Figure 5 R3 = 2nd Order Lowpass 6 4 100k R2 = fO AND Q VALUES C2 100kHz f–3dB VOUT Butterworth fO = f–3dB Q = 0.707 Bessel fO = 1.274 • f–3dB Q = 0.
PAGE 17
LTC6255/LTC6256/LTC6257 Typical Applications When VIN is at 0V, the op amp supply current is nominally 65µA, but the 450µV maximum input offset may appear across R3 inducing a 4.5mA current in the LED. Some applications want a guaranteed zero LED current at VIN = 0, and this is the purpose of RUP. RUP forces 5µA reverse current through R5 creating a negative 1.2mV output offset at R3.
PAGE 18
LTC6255/LTC6256/LTC6257 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. 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.
PAGE 19
LTC6255/LTC6256/LTC6257 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. TS8 Package 8-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1637 Rev A) 0.40 MAX 2.90 BSC (NOTE 4) 0.65 REF 1.22 REF 1.4 MIN 3.85 MAX 2.62 REF 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE ID RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.22 – 0.36 8 PLCS (NOTE 3) 0.65 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.
PAGE 20
LTC6255/LTC6256/LTC6257 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660 Rev F) 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 0.889 ± 0.127 (.035 ± .005) 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 0.254 (.010) 8 7 6 5 3.00 ± 0.102 (.118 ± .004) (NOTE 4) 4.90 ± 0.152 (.193 ± .006) DETAIL “A” 0.52 (.0205) REF 0° – 6° TYP GAUGE PLANE 0.42 ± 0.038 (.0165 ± .0015) TYP 0.
PAGE 21
LTC6255/LTC6256/LTC6257 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. MS Package 10-Lead Plastic MSOP (Reference LTC DWG # 05-08-1661 Rev E) 0.889 ± 0.127 (.035 ± .005) 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 0.50 0.305 ± 0.038 (.0197) (.0120 ± .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) 10 9 8 7 6 3.00 ± 0.102 (.118 ± .004) (NOTE 4) 4.90 ± 0.152 (.193 ± .
PAGE 22
LTC6255/LTC6256/LTC6257 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. MS Package 16-Lead Plastic MSOP (Reference LTC DWG # 05-08-1669 Rev Ø) 0.889 ± 0.127 (.035 ± .005) 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 4.039 ± 0.102 (.159 ± .004) (NOTE 3) 0.50 (.0197) BSC 0.305 ± 0.038 (.0120 ± .0015) TYP RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) DETAIL “A” 3.00 ± 0.102 (.118 ± .004) (NOTE 4) 4.90 ± 0.152 (.193 ± .
PAGE 23
LTC6255/LTC6256/LTC6257 Revision History REV DATE DESCRIPTION A 9/10 Revised AV Conditions in 5V Electrical Characteristics and 1.8V Electrical Characteristics sections B 9/11 PAGE NUMBER 4, 5 Revised IS MAX values in 5V Electrical Characteristics section 4 Revised ISC MIN values in 1.8V Electrical Characteristics section 6 Updated the Features and Description sections. Added C-, H-, and I-grades to the Absolute Maximum Ratings and Order Information sections. Updated 5V and 1.
PAGE 24
LTC6255/LTC6256/LTC6257 Typical Application 2µs Rise Time Analog 1A Pulsed LED Current Driver. LTC6255 Applied as a LED Current Driver with 2µs Rise Time VIN R1 9.76k + R2 200Ω 5V – RUP 1M** 5V ILED = VIN • 200mA/V 5V SHDN LTC6255 C1 220pF LED OSRAM LRW5SM ILED R4 51Ω Q1 Q2 VIN Q3 Q1 TO Q3 MOSFETs 3× 2N7000 RSD 100k* R5 240Ω * RSD GUARANTEES LED OFF WHEN OP AMP SHDN. OTHERWISE OPTIONAL. ** RUP FORCES LED COMPLETELY OFF WHEN VIN = 0. OTHERWISE OPTIONAL.