Datasheet

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LT1800

1800fa

TYPICAL APPLICATION

DESCRIPTION

80MHz, 25V/µs Low Power

Rail-to-Rail Input and Output

Precision Op Amp

The LT

1800 is a low power, high speed rail-to-rail input and

output operational ampliﬁ er with excellent DC performance.

The LT1800 features reduced supply current, lower input

offset voltage, lower input bias current and higher DC gain

than other devices with comparable bandwidth.

The LT1800 has an input range that includes both supply

rails and an output that swings within 20mV of either

supply rail to maximize the signal dynamic range in low

supply applications.

The LT1800 maintains its performance for supplies from

2.3V to 12.6V and is speciﬁ ed at 3V, 5V and ±5V supplies.

The inputs can be driven beyond the supplies without

damage or phase reversal of the output.

The LT1800 is available in the 8-pin SO package with

the standard op amp pinout and in the 5-pin TSOT-23

package. For dual and quad versions of the LT1800, see

the LT1801/LT1802 data sheet. The LT1800 can be used

as a plug-in replacement for many op amps to improve

input/output range and performance.

Single Supply 1A Laser Driver Ampliﬁ er

FEATURES

APPLICATIONS

Gain Bandwidth Product: 80MHz

Input Common Mode Range Includes Both Rails

Output Swings Rail-to-Rail

Low Quiescent Current: 2mA Max

Input Offset Voltage: 350μV Max

Input Bias Current: 250nA Max

Low Voltage Noise: 8.5nV/√Hz

Slew Rate: 25V/µs

Common Mode Rejection: 105dB

Power Supply Rejection: 97dB

Open-Loop Gain: 85V/mV

Operating Temperature Range: –40°C to 85°C

Available in the 8-Pin SO and 5-Pin Low Proﬁ le

(1mm) ThinSOT™ Packages

Low Voltage, High Frequency Signal Processing

Driving A/D Converters

Rail-to-Rail Buffer Ampliﬁ ers

Active Filters

Video Line Driver

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.

Laser Driver Ampliﬁ er 500mA Pulse Response

–

LT1800

DO NOT FLOAT

IR LASER

INFINEON

SFH495

ZETEX

FMMT619

330Ω

1Ω

1800 TA01a

39pF

10Ω

1800 TA01b

50ns/DIV

100mA/DIV

Summary of content (18 pages)

PAGE 1
LT1800 80MHz, 25V/µs Low Power Rail-to-Rail Input and Output Precision Op Amp DESCRIPTION FEATURES n n n n n n n n n n n n n Gain Bandwidth Product: 80MHz Input Common Mode Range Includes Both Rails Output Swings Rail-to-Rail Low Quiescent Current: 2mA Max Input Offset Voltage: 350μV Max Input Bias Current: 250nA Max Low Voltage Noise: 8.
PAGE 2
LT1800 ABSOLUTE MAXIMUM RATINGS (Note 1) Total Supply Voltage (VS– to VS+) ..........................12.6V Input Current (Note 2)..........................................±10mA 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 Storage Temperature Range...................
PAGE 3
LT1800 ELECTRICAL CHARACTERISTICS TA = 25°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. SYMBOL PARAMETER CONDITIONS en Input Noise Voltage Density f = 10kHz MIN 8.5 nV/√Hz in Input Noise Current Density f = 10kHz 1 pA/√Hz CIN Input Capacitance f = 100kHz 2 pF AVOL Large-Signal Voltage Gain VS = 5V, VO = 0.5V to 4.5V, RL = 1k at VS/2 VS = 5V, VO = 1V to 4V, RL = 100Ω at VS/2 VS = 3V, VO = 0.5V to 2.5V, RL = 1k at VS/2 35 3.
PAGE 4
LT1800 ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the temperature range of 0°C ≤ TA ≤ 70°C. C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. SYMBOL PARAMETER CONDITIONS Input Common Mode Range PSRR Power Supply Rejection Ratio VS = 2.5V to 10V, VCM = 0V Minimum Supply Voltage (Note 6) MIN l 0 l 74 TYP MAX UNITS VS 91 V dB l 2.3 2.
PAGE 5
LT1800 ELECTRICAL CHARACTERISTICS SYMBOL TA = 25°C, VS = ±5V, VCM = 0V, VOUT = 0V, unless otherwise noted. PARAMETER CONDITIONS VOS Input Offset Voltage ΔVOS Input Offset Shift IB Input Bias Current IOS Input Offset Current VCM = VS– VCM = VS– (SOT-23) VCM = VS+ VCM = VS+ (SOT-23) VCM = VS– to VS+ – 1.5V VCM = VS– + 1V VCM = VS+ VCM = VS– + 1V VCM = VS+ Input Noise Voltage MIN TYP MAX UNITS 150 400 0.7 1 500 1000 3.5 4.
PAGE 6
LT1800 ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the temperature range of 0°C ≤ TA ≤ 70°C. VS = ±5V, VCM = 0V, VOUT = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS IOS Input Offset Current VCM = VS– + 1V VCM = VS+ – 0.2V l l AVOL Large-Signal Voltage Gain VO = –4V to 4V, RL = 1k VO = –2V to 2V, RL = 100Ω l l 20 2 55 5 CMRR Common Mode Rejection Ratio VCM = VS– to 3.
PAGE 7
LT1800 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 and by ESD diodes to the supply rails. If the differential input voltage exceeds 1.4V or either input goes outside the rails, the input current should be limited to less than 10mA.
PAGE 8
LT1800 TYPICAL PERFORMANCE CHARACTERISTICS Input Bias Current vs Common Mode Voltage 0.2 0 –0.2 0.5 0.4 0.3 0.2 –0.4 –0.6 0.1 –0.8 0 –1.0 0 2 3 4 5 1 INPUT COMMON MODE VOLTAGE (V) –1 NPN ACTIVE VS = 5V, 0V VCM = 5V 0.6 0.4 PNP ACTIVE VS = 5V, 0V VCM = 1V –0.1 –60 6 OUTPUT SATURATION VOLTAGE (V) 0.7 INPUT BIAS (μA) INPUT BIAS CURRENT (μA) 0.6 10 0.8 VS = 5V, 0V TA = 25°C TA = 125°C TA = –55°C 0.
PAGE 9
LT1800 TYPICAL PERFORMANCE CHARACTERISTICS Warm-Up Drift vs Time (LT1800S8) Offset Voltage vs Output Current Input Noise Voltage vs Frequency 60 120 VS = 5V, 0V VS = ±5V 1.0 100 TA = –55°C 0.5 0 –0.5 TA = 25°C TA = 125°C 50 90 VS = ±2.5V 80 70 –1.0 60 –1.5 50 –2.0 15 30 –60 –45 –30 –15 0 OUTPUT CURRENT (mA) VS = ±5V NOISE VOLTAGE (nV/√Hz) 110 OFFSET VOLTAGE (μV) 1.5 VS = ±1.
PAGE 10
LT1800 TYPICAL PERFORMANCE CHARACTERISTICS Slew Rate vs Temperature VS = ±2.5V 25 VS = ±5V 20 70 100 60 80 PHASE 50 60 40 40 20 30 GAIN 20 0 10 –20 0 –40 –60 –10 15 VS = ±2.5V VS = ±5V –20 10 –55 –35 –15 –30 0.01 5 25 45 65 85 105 125 TEMPERATURE (oC) 0.1 –80 –100 100 300 1 10 FREQUENCY (MHz) 1800 G24 1800 G23 Gain vs Frequency (AV = 1) Gain vs Frequency (AV = 2) RL = 1k 15 CL = 10pF AV = 2 12 3 VS = ±2.5V 0 VS = ±5V –3 GAIN (dB) 6 9 6 VS = ±2.
PAGE 11
LT1800 TYPICAL PERFORMANCE CHARACTERISTICS Series Output Resistor vs Capacitive Load Distortion vs Frequency –40 VS = 5V, 0V AV = 2 55 50 –50 DISTORTION (dBc) OVERSHOOT (%) 45 40 35 30 ROS = 10Ω 25 20 ROS = 20Ω 15 10 VS = 5V, 0V AV = 1 VOUT = 2VP-P –60 ROS = RL = 50Ω 0 100 1000 CAPACITIVE LOAD (pF) 10 10000 –50 RL = 1507, 2ND –70 RL = 1k, 2ND RL = 150Ω, 3RD –80 –90 –100 5 Distortion vs Frequency –40 0.
PAGE 12
LT1800 APPLICATIONS INFORMATION Circuit Description A pair of complementary common emitter stages Q14/Q15 that enable the output to swing from rail to rail constructs the output stage. The capacitors C2 and C3 form the local feedback loops that lower the output impedance at high frequency. These devices are fabricated on Linear Technology’s proprietary high speed complementary bipolar process.
PAGE 13
LT1800 APPLICATIONS INFORMATION output voltage is at half of either supply voltage (or the maximum swing is less than 1/2 supply voltage). PDMAX is given by: PDMAX = (VS • ISMAX) + (VS/2)2/RL Example: An LT1800 in a SOT-23 package operating on ±5V supplies and driving a 50Ω load, the worst-case power dissipation is given by: PDMAX = (10 • 4mA) + (2.5)2/50 = 0.04 + 0.125 = 0.165W The maximum ambient temperature that the part is allowed to operate is: TA = TJ – (PDMAX • 250°C/W) = 150°C – (0.
PAGE 14
LT1800 APPLICATIONS INFORMATION Feedback Components 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 total capacitance at the inverting input does not degrade stability. For instance, the LT1800 in a noninverting gain of 2, set up with two 5k resistors and a capacitance of 5pF (part plus PC board) will probably ring in transient response. The pole is formed at 12.
PAGE 15
LT1800 TYPICAL APPLICATIONS Single 3V Supply, 1MHz, 4th Order Butterworth Filter The circuit shown in Figure 4 makes use of the low voltage operation and the wide bandwidth of the LT1800 to create a DC accurate 1MHz 4th order lowpass ﬁlter powered from a 3V supply. The ampliﬁers are conﬁgured in the inverting mode for the lowest distortion and the output can swing 47pF 909Ω 909Ω rail-to-rail for maximum dynamic range. Figure 5 displays the frequency response of the ﬁlter.
PAGE 16
LT1800 PACKAGE DESCRIPTION S5 Package 5-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1635) 0.62 MAX 0.95 REF 2.90 BSC (NOTE 4) 1.22 REF 1.4 MIN 3.85 MAX 2.62 REF 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.30 – 0.45 TYP 5 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. DIMENSIONS ARE INCLUSIVE OF PLATING 4.
PAGE 17
LT1800 PACKAGE DESCRIPTION S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .050 BSC .189 – .197 (4.801 – 5.004) NOTE 3 .045 ±.005 8 .245 MIN .160 ±.005 5 .150 – .157 (3.810 – 3.988) NOTE 3 1 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) 2 3 4 .053 – .069 (1.346 – 1.752) .004 – .010 (0.101 – 0.254) 0°– 8° TYP .016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN 6 .228 – .244 (5.791 – 6.197) .030 ±.005 TYP .008 – .010 (0.203 – 0.
PAGE 18
LT1800 TYPICAL APPLICATION Low Power High Voltage Ampliﬁer Certain materials used in optical applications have characteristics that change due to the presence and strength of a DC electric ﬁeld. The voltage applied across these materials should be precisely controlled to maintain desired properties, sometimes as high as 100’s of volts. The materials are not conductive and represent a capacitive load.