Datasheet

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LTC6252/LTC6253/LTC6254

625234fc

TYPICAL APPLICATION

DESCRIPTION

720MHz, 3.5mA Power

Efficient Rail-to-Rail

I/O Op Amps

The LTC

6252/LTC6253/LTC6254 are single/dual/quad low

power, high speed unity gain stable rail-to-rail input/output

operational amplifiers. On only 3.5mA of supply current

they feature a 720MHz gain-bandwidth product, 280V/µs

slew rate and a low 2.75nV/√Hz of input-referred noise.

The combination of high bandwidth, high slew rate, low

power consumption and low broadband noise makes the

LTC6252 family unique among rail-to-rail input/output op

amps with similar supply currents. They are ideal for lower

supply voltage high speed signal conditioning systems.

The LTC6252 family maintains high efficiency performance

from supply voltage levels of 2.5V to 5.25V and is fully

specified at supplies of 2.7V and 5.0V.

For applications that require power-down, the LTC6252 and

the LTC6253 in MS10 offer a shutdown pin which disables

the amplifier and reduces current consumption to 42µA.

The LTC6252 family can be used as a plug-in replacement

for many commercially available op amps to reduce power

or to improve input/output range and performance.

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

Technology Corporation. All other trademarks are the property of their respective owners.

FEATURES

APPLICATIONS

Gain Bandwidth Product: 720MHz

–3dB Frequency (A

= 1): 400MHz

Low Quiescent Current: 3.5mA Max

High Slew Rate: 280V/µs

Input Common Mode Range Includes Both Rails

Output Swings Rail-to-Rail

Low Broadband Voltage Noise: 2.75nV/√Hz

Power-Down Mode: 42μA

Fast Output Recovery

Supply Voltage Range: 2.5V to 5.25V

Input Offset Voltage: 350µV Max

Large Output Current: 90mA

CMRR: 105dB

Open Loop Gain: 60V/mV

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

Single in 6-Pin TSOT-23

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

Quad in MS16

Low Voltage, High Frequency Signal Processing

Driving A/D Converters

Rail-to-Rail Buffer Amplifiers

Active Filters

Battery Powered Equipment

5V Single-Supply 16-Bit ADC Driver LTC6253 Driving LTC2393-16

16-Bit ADC 5V Single-Supply

Performance

0.1µF10µF

~2.08V

0.1µF10µF

SER/PAR

BYTESWAP

OB/2C

BUSY

PARALLEL

SERIAL

INTERFACE

OGND

625234 TA01

–

3900pF

249Ω

100Ω

249Ω 100Ω

27.4mV TO

(3.5V + 27.4mV)

GND

RESETCNVST

SAMPLE CLOCK

REFOUT

REFIN

AVP DVP

LTC2393-16

OVP

1.8V TO 5V

16 BIT

VCM

1µF10µF

2.5k2.5k143Ω

845Ω

4.7µF

–

½ LTC6253

–

½ LTC6253

FREQUENCY (kHz)

AMPLITUDE (dBFS)

–80

–20

–40

–60

–100

–120

–140

–160

200 400100 300

624678 TA01b

500

= 1Msps

F1 = 20.111kHz

F1 AMPLITUDE

= –1.032dBFS

SNR = 93.28dB

THD = –100.50dB

SINAD = 92.53dB

SFDR = 104.7dB

F2 = –106.39dBc

F3 = –104.70dBc

F4 = –114.13dBc

F5 = –105.48dBc

Summary of content (26 pages)

PAGE 1
LTC6252/LTC6253/LTC6254 720MHz, 3.5mA 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 n n n n Gain Bandwidth Product: 720MHz –3dB Frequency (AV = 1): 400MHz Low Quiescent Current: 3.5mA Max High Slew Rate: 280V/µs Input Common Mode Range Includes Both Rails Output Swings Rail-to-Rail Low Broadband Voltage Noise: 2.75nV/√Hz Power-Down Mode: 42μA Fast Output Recovery Supply Voltage Range: 2.5V to 5.
PAGE 2
LTC6252/LTC6253/LTC6254 ABSOLUTE MAXIMUM RATINGS (Note 1) Total Supply Voltage (V+ to V –).................................5.5V Input Current (+IN, –IN, SHDN) (Note 2)............... ±10mA Output Current (Note 3)...................................... ±100mA Operating Temperature Range (Note 4).. –40°C to 125°C Specified Temperature Range (Note 5)... –40°C to 125°C Storage Temperature Range................... –65°C to 150°C Junction Temperature............................................
PAGE 3
LTC6252/LTC6253/LTC6254 ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LTC6253CMS#PBF LTC6253CMS#TRPBF LTFSB 10-Lead Plastic MSOP 0°C to 70°C LTC6253IMS#PBF LTC6253IMS#TRPBF LTFSB 10-Lead Plastic MSOP –40°C to 85°C LTC6254CMS#PBF LTC6254CMS#TRPBF 6254 16-Lead Plastic MSOP 0°C to 70°C LTC6254IMS#PBF LTC6254IMS#TRPBF 6254 16-Lead Plastic MSOP –40°C to 85°C LTC6254HMS#PBF LTC6254HMS#TRPBF 6254 16-Lead Plastic MSOP –40°
PAGE 4
LTC6252/LTC6253/LTC6254 ELECTRICAL CHARACTERISTICS (VS = 5V) The l denotes the specifications which apply across the specified temperature range, otherwise specifications are at TA = 25°C. For each amplifier VS = 5V, 0V; VSHDN = 2V; VCM = VOUT = 2.5V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS VCMR Input Common Mode Range PSRR Power Supply Rejection Ratio VS = 2.5V to 5.25V VCM = 1V Supply Voltage Range (Note 6) VOL Output Swing Low (VOUT – V–) MIN l 0 l 66.5 62 l 2.
PAGE 5
LTC6252/LTC6253/LTC6254 ELECTRICAL CHARACTERISTICS (VS = 5V) The l denotes the specifications which apply across the specified temperature range, otherwise specifications are at TA = 25°C. For each amplifier VS = 5V, 0V; VSHDN = 2V; VCM = VOUT = 2.5V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS HD2/HD3 Harmonic Distortion RL = 1k to Half Supply fC = 100kHz, VO = 2VP-P fC = 1MHz, VO = 2VP-P fC = 2.
PAGE 6
LTC6252/LTC6253/LTC6254 ELECTRICAL CHARACTERISTICS (VS = 2.7V) The l denotes the specifications which apply across the specified temperature range, otherwise specifications are at TA = 25°C. For each amplifier VS = 2.7V, 0V; VSHDN = 2V; VCM = VOUT = 1.35V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS CMRR VCM = 0V to 1.2V Common Mode Rejection Ratio VCMR Input Common Mode Range PSRR Power Supply Rejection Ratio VS = 2.5V to 5.
PAGE 7
LTC6252/LTC6253/LTC6254 ELECTRICAL CHARACTERISTICS Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The inputs are protected by back-to-back diodes. If any of the input or shutdown pins goes 300mV beyond either supply or the differential input voltage exceeds 1.4V the input current should be limited to less than 10mA.
PAGE 8
LTC6252/LTC6253/LTC6254 TYPICAL PERFORMANCE CHARACTERISTICS VOS Distribution, VCM = V+ – 0.5V (TSOT-23, NPN Stage) VOS vs Temperature, VS = 5V, 0V (MS, PNP Stage) 18 300 VS = 5V, 0V 16 VCM = 4.5V 10 8 6 0 –100 –200 –300 4 –400 2 –500 0 –2000 –1200 –400 400 1200 INPUT OFFSET VOLTAGE (µV) 3200 5 25 45 65 85 105 125 TEMPERATURE (°C) 600 500 5 25 45 65 85 105 125 TEMPERATURE (°C) 625234 G07 1700 1200 700 200 –300 –800 VS = 2.7V, 0V –1300 VCM = 2.
PAGE 9
LTC6252/LTC6253/LTC6254 TYPICAL PERFORMANCE CHARACTERISTICS Input Bias Current vs Temperature 2000 VS = 5V, 0V 1500 VOLTAGE NOISE (500nV/DIV) INPUT BIAS CURRENT (nA) 2500 2000 VCM = 4.5V 1500 1000 500 1000 VCM = 2.5V 0 1000 VOLTAGE NOISE (nV/√Hz) CURRENT NOISE (pA/√Hz) 3000 500 0 –500 –1000 –25 5 35 65 TEMPERATURE (°C) 95 125 –2000 0 2 1 3 4 5 6 7 TIME (1s/DIV) 8 in, VCM = 2.5V 10 1.0 5.0 5 en, VCM = 2.5V 2.5 10 100 –55°C 2.0 1.5 in, VCM = 4.
PAGE 10
LTC6252/LTC6253/LTC6254 TYPICAL PERFORMANCE CHARACTERISTICS Output Saturation Voltage vs Load Current (Output Low) Output Saturation Voltage vs Load Current (Output High) 10 1 TA = 125°C TA = 25°C TA = –55°C 0.01 0.01 0.1 1 10 LOAD CURRENT (mA) 1 TA = 125°C TA = 25°C 0.1 TA = –55°C 0.01 0.01 100 0.1 1 10 LOAD CURRENT (mA) 625234 G22 1400 INPUT OFFSET VOLTAGE (µV) RL = 100Ω TO MID SUPPLY 200 RL = 1k TO MID SUPPLY 100 0 –100 RL = 1k TO GND –200 –300 RL = 100Ω TO GND –400 –500 0.
PAGE 11
LTC6252/LTC6253/LTC6254 TYPICAL PERFORMANCE CHARACTERISTICS Gain Bandwidth and Phase Margin vs Temperature 100 60 VS = ±1.35V 50 900 800 GAIN BANDWIDTH PRODUCT 40 700 VS = ±2.5V 30 AV = 10 10 AV = 1 1 AV = 2 0.1 0.01 20 600 COMMON MODE REJECTION RATIO (dB) 1000 VS = ±2.5V 70 110 VS = ±2.5V VS = ±1.35V 10 5 25 45 65 85 105 125 TEMPERATURE (°C) 500 –55 –35 –15 0.001 0.
PAGE 12
LTC6252/LTC6253/LTC6254 TYPICAL PERFORMANCE CHARACTERISTICS Distortion vs Frequency AV = 2, 2.7V) RL = 100Ω, 3RD –70 –80 RL = 100Ω, 2ND –90 –100 DISTORTION (dBc) DISTORTION (dBc) VS = ±1.35V –30 V OUT = 1VP-P –40 AV = 2 RL = 1k, 3RD –60 RL = 100Ω, 3RD –50 –60 RL = 100Ω, 2ND –70 –80 –90 RL = 1k, 3RD –100 RL = 1k, 2ND –110 –110 –120 RL = 1k, 2ND 0.1 1 10 FREQUENCY (MHz) 100 –130 0.01 0.1 625234 G40 3 2 1 40 VIN 35 – + 100 VS = ±2.5V TA = 25°C RL = 1k HD2, HD3 < –40dBc 0 0.
PAGE 13
LTC6252/LTC6253/LTC6254 PIN FUNCTIONS –IN: Inverting Input of Amplifier. Input range from V– to V+. V– : Negative Supply Voltage. Typically 0V. This can be made a negative voltage as long as 2.5V ≤ (V+ – V–) ≤ 5.25V. +IN: Non-Inverting Input of Amplifier. Input range from V– to V+. SHDN: Active Low Shutdown. Threshold is typically 1.1V referenced to V–. Floating this pin will turn the part on. V+ : Positive Supply Voltage. Total supply voltage ranges from 2.5V to 5.25V. OUT: Amplifier Output.
PAGE 14
LTC6252/LTC6253/LTC6254 APPLICATIONS INFORMATION Input Offset Voltage Input Protection The offset voltage will change depending upon which input stage is active. The PNP input stage is active from the negative supply rail to approximately 1.2V below the positive supply rail, then the NPN input stage is activated for the remaining input range up to the positive supply rail with the PNP stage inactive.
PAGE 15
LTC6252/LTC6253/LTC6254 APPLICATIONS INFORMATION Feedback Components Power Dissipation When feedback resistors are used to set up gain, care must be taken to ensure that the pole formed by the feedback resistors and the parasitic capacitance at the inverting input does not degrade stability.
PAGE 16
LTC6252/LTC6253/LTC6254 TYPICAL APPLICATIONS 5V Single-Supply 16-Bit ADC Driver Figure 3 shows the LTC6253 driving an LTC2393-16 16-bit A/D converter on a single 5V supply. The low wideband noise of the LTC6253 helps to achieve better than 93dB SNR. A gain of 1.17V/V is taken in the first amplifier, giving an input voltage range of 3.5VP-P for a full-scale input to the ADC.
PAGE 17
LTC6252/LTC6253/LTC6254 TYPICAL APPLICATIONS Low Noise Gain Block Using Channels in Parallel Multiplexing Channels Figure 5 shows the LTC6254 configured as a low noise gain block. By configuring each channel as a gain of 10 block and putting all four gain blocks in parallel, the input referred noise can be reduced significantly. 22Ω resistors are hooked up to the outputs of each of the channels to ensure even distribution of load currents.For a total supply current of 13.
PAGE 18
LTC6252/LTC6253/LTC6254 TYPICAL APPLICATIONS stages. See the oscillograph of Figure 7, showing the inputs VA and VB, the SEL_B control, and the resulting output. Note that there are protection diodes across the op amp inputs, so large signals at the output will feed back into the upstream off channel through the diodes. R1 and R2 were put in place to reduce the loading on the output, as well as to reduce the upstream feedback current and improve reverse isolation.
PAGE 19
LTC6252/LTC6253/LTC6254 PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. DC8 Package 8-Lead Plastic DFN (2mm × 2mm) (Reference LTC DWG # 05-08-1719 Rev A) 0.70 ±0.05 2.55 ±0.05 1.15 ±0.05 0.64 ±0.05 (2 SIDES) PACKAGE OUTLINE 0.25 ± 0.05 0.45 BSC 1.37 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED R = 0.05 TYP 2.00 ±0.10 (4 SIDES) PIN 1 BAR TOP MARK (SEE NOTE 6) R = 0.
PAGE 20
LTC6252/LTC6253/LTC6254 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) 0.889 ± 0.127 (.035 ± .005) 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 0.254 (.010) 3.00 ± 0.102 (.118 ± .004) (NOTE 3) DETAIL “A” 8 7 6 5 0° – 6° TYP GAUGE PLANE 0.53 ± 0.152 (.021 ± .006) 0.52 (.0205) REF 3.00 ± 0.102 (.118 ± .004) (NOTE 4) 4.90 ± 0.152 (.193 ± .
PAGE 21
LTC6252/LTC6253/LTC6254 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 ± .006) DETAIL “A” 0.
PAGE 22
LTC6252/LTC6253/LTC6254 PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. MS Package MSPlastic Package 16-Lead MSOP Plastic MSOP Rev Ø) (Reference16-Lead LTC DWG # 05-08-1669 (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.
PAGE 23
LTC6252/LTC6253/LTC6254 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 24
LTC6252/LTC6253/LTC6254 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 25
LTC6252/LTC6253/LTC6254 REVISION HISTORY REV DATE DESCRIPTION A 9/10 Revised ISD Parameters in Electrical Characteristics section PAGE NUMBER B 6/11 Added H-grade MS8 to Order Information section C 1/12 Updated Electrical Characteristics 4, 5 2 3 to 6 625234fc Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use.
PAGE 26
LTC6252/LTC6253/LTC6254 TYPICAL APPLICATION 2MHz, 1MΩ Single Supply Photodiode Amplifier 500 R1 1M, 1% C1 0.1pF 3V R2 1k IPD Q1 NXP BF862 C2 6.8nF FILM OR NPO PD1 OSRAM SFH213 3V Photodiode Amplifier Noise Spectrum R3 1k R4 10k 50nV/√Hz PER DIV 3V + VOUT ≈ 0.5V + IPD • 1M LTC6252 – –3dB BW = 2MHz ICC = 4.5mA OUTPUT NOISE = 360µVRMS MEASURED ON A 2MHz BW C3 0.