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FEATURES
■
20MHz Bandwidth
■
75V/µs Slew Rate
Drives ±10V into 75Ω
■
■
5mA Quiescent Current
■
Drives Capacitive Loads > 1µF
■
Current and Thermal Limit
Operates from Single Supply ≥ 4.5V
■
■
Very Low Distortion Operation
■
Available in 8-Pin miniDIP, Plastic TO-220
and Tiny 3mm × 3mm × 0.75mm 8-Pin DFN
Packages
U
APPLICATIO S
■
Boost Op Amp Output
■
Isolate Capacitive Loads
■
Drive Long Cables
■
Audio Amplifiers
■
Video Amplifiers
■
Power Small Motors
■
Operational Power Supply
■
FET Driver
TYPICAL APPLICATIO
Very Low Distortion Buffered Preamplifier
+
V
18V
R1
1k
C1
R2
22pF
1M
R3
1k
NOTE 1: ALL RESISTORS 1% METAL FILM
NOTE 2: SUPPLIES WELL BYPASSED AND LOW Z
+
V
–18V
U
C2
22pF
3
7
+
R6
100Ω
6
IN
LT1056CN8
LT1010CT
2
–
4
R4
10k
+
V
LM334
R
SET
33.2Ω
O
–
I
= 2mA
V
SET
1%
Fast ±150mA Power Buffer
DESCRIPTIO
®
The LT
1010 is a fast, unity-gain buffer that can increase
the output capability of existing IC op amps by more than
an order of magnitude. This easy-to-use part makes fast
amplifiers less sensitive to capacitive loading and reduces
thermal feedback in precision DC amplifiers.
Designed to be incorporated within the feedback loop, the
buffer can isolate almost any reactive load. Speed can be
improved with a single external resistor. Internal operat-
ing currents are essentially unaffected by the supply
voltage range. Single supply operation is also practical.
This monolithic IC is supplied in 8-pin miniDIP, plastic
TO-220 and 8-pin DFN packages. The low thermal resis-
tance power package is an aid in reducing operating
junction temperatures.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
R7
50Ω
+
V
R8
BOOST
100Ω
OUT
OUTPUT
–
V
1010 TA01
LT1010
U
0.4
V
= 10V
OUT
P-P
R
= 400Ω
L
0.3
0.2
0.1
0
10
100
1k
FREQUENCY (Hz)
10k
100k
1010 TA02
1010fc
1
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Related Manuals for Linear MT 525
Summary of Contents for Linear MT 525
- Page 1 FEATURES ■ 20MHz Bandwidth ■ 75V/µs Slew Rate Drives ±10V into 75Ω ■ ■ 5mA Quiescent Current ■ Drives Capacitive Loads > 1µF ■ Current and Thermal Limit Operates from Single Supply ≥ 4.5V ■ ■ Very Low Distortion Operation ■...
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Page 2: Electrical Characteristics
LT1010 ABSOLUTE AXI U RATI GS (Note 1) Total Supply Voltage ... ±22V Continuous Output Current ... ±150mA Input Current (Note 3) ... ±40mA Operating Junction Temperature Range LT1010C ... 0°C to 100°C Storage Temperature Range ... – 65°C to 150°C Lead Temperature (Soldering, 10 sec)... - Page 3 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER Positive Saturation Offset – Negative Saturation Offset Saturation Resistance Bias Terminal Voltage BIAS Supply Current 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.
- Page 4 LT1010 TYPICAL PERFOR A CE CHARACTERISTICS Bandwidth = 200Ω = 50Ω = 100mV 100pF = –3dB = 25°C QUIESCENT CURRENT (mA) 1010 G01 Small-Step Response = 100Ω = 25°C INPUT OUTPUT –50 –100 –150 TIME (ns) 1010 G04 Slew Response POSITIVE = ±15V = 100Ω...
- Page 5 TYPICAL PERFOR A CE CHARACTERISTICS Output Offset Voltage = 38V – = –2V = 2V – = –38V –50 TEMPERATURE (°C) 1010 G10 Voltage Gain 1.000 = 40V 0.999 = 4.5V 0.998 0.997 –50 TEMPERATURE (°C) 1010 G13 Positive Saturation Voltage = 150mA = 50mA = 5mA...
- Page 6 LT1010 TYPICAL PERFOR A CE CHARACTERISTICS Bias Terminal Voltage = ±20V = 100Ω BIAS = 20Ω BIAS –50 TEMPERATURE (°C) 1010 G19 Shorted Input Characteristics = ±15V = 25°C –25 –50 –15 –10 –5 INPUT VOLTAGE (V) 1010 G22 Total Harmonic Distortion = 50Ω...
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Page 7: Equivalent Circuit
APPLICATIO S I FOR ATIO General These notes briefly describe the LT1010 and how it is used; a detailed explanation is given elsewhere sis here will be on practical suggestions that have resulted from working extensively with the part over a wide range of conditions. - Page 8 LT1010 APPLICATIO S I FOR ATIO ground plane is prudent, especially when operating at high frequencies. The buffer slew rate can be reduced by inadequate supply bypass. With output current changes much above 100mA/µs, using 10µF solid tantalum capacitors on both supplies is good practice, although bypassing from the positive to the negative supply may suffice.
- Page 9 APPLICATIO S I FOR ATIO be unrealistic to use these worst-case numbers above because paralleled units are operating under identical conditions. The offset voltage specified for V = 0V and T = 25°C will suffice for a worst-case condition. LT1010 LT1010 –...
- Page 10 LT1010 APPLICATIO S I FOR ATIO This is a good example of how fast op amps can be made quite easy to use by employing an output buffer. Integrator A lowpass amplifier can be formed just by using large C in the inverter described earlier, as long as the increasing closed-loop output impedance above the cutoff frequency is not a problem and the op amp is capable of supplying...
- Page 11 APPLICATIO S I FOR ATIO 800Ω – 20pF INPUT LT1010 HA2625 50Ω 200Ω LT1010 OTHER SLAVES The 50Ω video line splitter here puts feedback on one buffer with the others slaved. Offset and gain accuracy of slaves depend on their matching with master. When driving long cables, including a resistor in series with the output should be considered.
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Page 12: Voltage/Current Regulator
LT1010 APPLICATIO S I FOR ATIO excellent matching of the feedback resistors is required to get high output resistance. Output is bidirectional. 100k 100k 0.01% 0.01% – LT1012 LT1010 100k 0.01% 100k 0.01% This circuit uses an instrumentation amplifier to eliminate the matched resistors. - Page 13 APPLICATIO S I FOR ATIO High Current Booster The circuit below uses a discrete stage to get 3A output capacity. The configuration shown provides a clean, quick way to increase LT1010 output power. It is useful for high current loads such as linear actuator coils in disk drives. The 33Ω...
- Page 14 LT1010 APPLICATIO S I FOR ATIO Figures A and B show response with both output stages. The LT1010 is used in Figure A (Trace A = input, Trace B = output). Figure B uses the discrete stage and is slightly faster.
- Page 15 APPLICATIO S I FOR ATIO Typical thermal calculations for the miniDIP package are detailed in the following paragraphs. For 4.8mA supply current (typical at 50°C, 30V supply voltage—see supply current graphs) to the LT1010 at ±15V, P = power dissipated in the part is equal to: (30V)(0.0048A) = 0.144W The rise in junction is then: (0.144W)(130°C/W—This is θ...
- Page 16 LT1010 SCHE ATIC DIAGRA DEFI ITIO OF TER S Output Offset Voltage: The output voltage measured with the input grounded (split supply operation). Input Bias Current: The current out of the input terminal. Large-Signal Voltage Gain: The ratio of the output volt- age change to the input voltage change over the specified input voltage range.* Output Resistance: The ratio of the change in output...
- Page 17 PACKAGE DESCRIPTIO 3.5 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) 0.25 ± 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS PIN 1 TOP MARK (NOTE 6) 0.200 REF DD Package 8-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698) 0.675 ±0.05 PACKAGE OUTLINE...
- Page 18 LT1010 PACKAGE DESCRIPTIO .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) +.035 .325 –.015 +0.889 8.255 –0.381 NOTE: 1. DIMENSIONS ARE *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510)
- Page 19 PACKAGE DESCRIPTIO .390 – .415 (9.906 – 10.541) .230 – .270 (5.842 – 6.858) .460 – .500 (11.684 – 12.700) .330 – .370 (8.382 – 9.398) .067 .028 – .038 (1.70) (0.711 – 0.965) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use.
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Page 20: Related Parts
LT1010 RELATED PARTS PART NUMBER DESCRIPTION LT1206 250mA, 60MHz Current Feedback Amplifier LT1210 1.1A, 35MHz Current Feedback Amplifier LT1795 Dual 500mA, 50MHz CFA LT1886 Dual 700MHz, 200mA Op Amp Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ●...