Datasheet

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LT1210

1210fb

For more information www.linear.com/LT1210

Typical applicaTion

DescripTion

1.1A, 35MHz Current

Feedback Ampliﬁer

The LT

1210 is a current feedback ampliﬁer with high out-

put current and excellent large-signal characteristics. The

combin

ation of high slew rate, 1.1A output drive and ±15V

operation enables the device to deliver signiﬁcant power

at frequencies in the 1MHz to 2MHz range. Short-circuit

protection and thermal shutdown ensure the device’s

ruggedness. The LT1210 is stable with large capacitive

loads, and can easily supply the large currents required

by the capacitive loading. A shutdown feature switches

the device into a high impedance and low supply current

mode, reducing dissipation when the device is not in use.

For lower bandwidth applications, the supply current can

be reduced with a single external resistor.

The LT1210 is available in the TO-220 and DD packages for

operation with supplies up to ±15V. For ±5V applications

the device is also available in a low thermal resistance

SO-16 package.

Twisted Pair Driver

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

FeaTures

applicaTions

1.1A Minimum Output Drive Current

35MHz Bandwidth, A

= 2, R

= 10Ω

900V/µs Slew Rate, A

= 2, R

= 10Ω

High Input Impedance: 10MΩ

Wide Supply Range: ±5V to ±15V

(TO-220 and DD Packages)

Enhanced θ

SO-16 Package for ±5V Operation

Shutdown Mode: I

< 200µA

Adjustable Supply Current

Stable with C

= 10,000pF

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

Available in 7-Lead DD, TO-220 and

16-Lead SO Packages

Cable Drivers

Buffers

Test Equipment Ampliﬁers

Video Ampliﬁers

ADSL Drivers

Total Harmonic Distortion vs Frequency

–

LT1210

4.7µF*

100nF

1210 TA01

11Ω

2.5W

T1**

845Ω

274Ω

100nF

15V

–15V

* TANTALUM

** MIDCOM 671-7783 OR EQUIVALENT

100Ω

2.5W

FREQUENCY (Hz)

TOTAL HARMONIC DISTORTION (dB)

–50

–60

–70

–80

–90

–100

10k 100k 1M

1210 TA02

= ±15V

OUT

= 20V

P-P

= 4

= 10Ω

= 50Ω

= 12.5Ω

Downloaded from Arrow.com.

Summary of content (20 pages)

PAGE 1
LT1210 1.1A, 35MHz Current Feedback Amplifier Features n n n n n n n n n n n Description 1.
PAGE 2
LT1210 Absolute Maximum Ratings (Note 1) Supply Voltage ...................................................... ± 18V Input Current........................................................ ±15mA Output Short-Circuit Duration (Note 2)...........................................Thermally Limited Operating Temperature Range (Note 3) LT1210C................................................ –40°C to 85°C LT1210I.................................................
PAGE 3
LT1210 Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCM = 0V, ± 5V ≤ VS ≤ ± 15V, pulse tested, VSD = 0V, unless otherwise noted.
PAGE 4
LT1210 Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCM = 0V, ± 5V ≤ VS ≤ ± 15V, pulse tested, VSD = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP SR Slew Rate (Note 7) Slew Rate (Note 5) TA = 25°C, AV = 2, RL = 400Ω TA = 25°C, AV = 2, RL = 10Ω 400 900 900 V/µs V/µs Differential Gain (Notes 5, 8) VS = ±15V, RF = 750Ω, RG = 750Ω, RL = 15Ω 0.
PAGE 5
LT1210 small-signal bandwidth RSD = 0Ω, IS = 30mA, VS = ± 5V, Peaking ≤ 1dB RSD = 0Ω, IS = 35mA, VS = ± 15V, Peaking ≤ 1dB AV RL RF RG – 3dB BW (MHz) AV RL RF RG – 3dB BW (MHz) –1 150 30 10 549 590 619 549 590 619 52.5 39.7 26.5 –1 150 30 10 604 649 665 604 649 665 66.2 48.4 46.5 1 150 30 10 604 649 619 – – – 53.5 39.7 27.4 1 150 30 10 750 866 845 – – – 56.8 35.4 24.7 2 150 30 10 562 590 576 562 590 576 51.8 38.8 27.4 2 150 30 10 665 715 576 665 715 576 52.5 38.9 35.
PAGE 6
LT1210 Typical Performance Characteristics Bandwidth vs Supply Voltage RF = 560Ω 50 RF = 750Ω 40 RF = 680Ω 30 RF = 1k 20 40 RF = 560Ω 30 RF = 750Ω RF = 1k 20 RF = 2k 10 14 12 10 8 SUPPLY VOLTAGE (±V) 6 16 0 18 4 16 14 12 10 8 SUPPLY VOLTAGE (±V) 6 70 RF =390Ω 60 50 RF = 330Ω RF = 470Ω 40 RF = 680Ω 30 20 10 40 30 RF = 680Ω 20 10k BANDWIDTH RF = 560Ω RF = 1k 10 RF = 1.5k RF = 1.
PAGE 7
LT1210 Typical Performance Characteristics Supply Current vs Supply Voltage 40 RSD = 0Ω 38 SUPPLY CURRENT (mA) TA = 85°C 34 32 30 28 TA = 125°C TA = –40°C 26 24 30 25 RSD = 7.5k 20 15 RSD = 15k 10 4 16 12 14 8 10 SUPPLY VOLTAGE (±V) 6 50 25 0 75 TEMPERATURE (°C) –25 20 15 10 5 0 100 300 400 200 SHUTDOWN PIN CURRENT (µA) –1.0 –1.5 –2.0 2.0 1.5 1.
PAGE 8
LT1210 Typical Performance Characteristics Output Impedance in Shutdown vs Frequency Output Impedance vs Frequency 10k 10 RSD = 82.5k RSD = 0Ω 1 0.1 0.
PAGE 9
LT1210 applications information Feedback Resistor Selection The optimum value for the feedback resistors is a function of the operating conditions of the device, the load impedance and the desired flatness of response. The Typical AC Performance tables give the values which result in less than 1dB of peaking for various resistive loads and operating conditions. If this level of flatness is not required, a higher bandwidth can be obtained by use of a lower feedback resistor.
PAGE 10
LT1210 applications information 15V VIN + VOUT LT1210 – SD response. The quiescent current can be reduced to 9mA in the inverting configuration without much change in response. In noninverting mode, however, the slew rate is reduced as the quiescent current is reduced. RF –15V 5V 74C906 ENABLE 24k 15V RG 1210 F02 Figure 2. Shutdown Interface resistor speeds up the turn-off time and ensures that the LT1210 is completely turned off.
PAGE 11
LT1210 applications information bandwidth is reduced. The photos in Figures 5a, 5b and 5c show the large-signal response of the LT1210 for various gain configurations. The slew rate varies from 770V/µs for a gain of 1, to 1100V/µs for a gain of – 1. RF = 825Ω RL = 10Ω VS = ±15V When the LT1210 is used to drive capacitive loads, the available output current can limit the overall slew rate. In the fastest configuration, the LT1210 is capable of a slew rate of over 1V/ns.
PAGE 12
LT1210 Applications Information Power Supplies The LT1210 will operate from single or split supplies from ± 5V (10V total) to ±15V (30V total). It is not necessary to use equal value split supplies, however the offset voltage and inverting input bias current will change. The offset voltage changes about 500µV per volt of supply mismatch. The inverting bias current can change as much as 5µA per volt of supply mismatch, though typically the change is less than 0.5µA per volt.
PAGE 13
LT1210 applications information T7 Package, 7-Lead TO-220 Thermal Resistance (Junction-to-Case) = 5°C/W 5V 76mA A Calculating Junction Temperature The junction temperature can be calculated from the equation: + LT1210 – TJ = (PD)(θJA) + TA 2V 0V –2V VO SD 10Ω VO = 1.
PAGE 14
LT1210 typical Applications CMOS Logic to Shutdown Interface Precision × 10 High Current Amplifier 15V VIN + + + LT1097 LT1210 COMP – SD – LT1210 SD OUT – 0.01µF 500pF 5V 3k 330Ω –15V 10k 2N3904 9.09k OUTPUT OFFSET: <500µV SLEW RATE: 2V/µs BANDWIDTH: 4MHz STABLE WITH CL < 10nF 1210 TA04 1k 1210 TA03 Distribution Amplifier + VIN 75Ω 75Ω LT1210 SD – 24k Buffer AV = 1 VIN 75Ω CABLE 75Ω RF + LT1210 COMP SD – 75Ω RF** RG VOUT 0.
PAGE 15
LT1210 simplified schematic V+ TO ALL CURRENT SOURCES Q5 Q10 Q2 Q18 D1 Q6 Q1 Q17 Q9 V– 1.25k +IN SHUTDOWN Q11 Q15 CC –IN V– 50Ω COMP RC OUTPUT V+ V+ Q12 Q3 Q8 Q16 Q14 D2 Q4 Q7 Q13 V– 1210 SS 1210fb For more information www.linear.com/LT1210 Downloaded from Arrow.com.
PAGE 16
LT1210 Package Description Please refer to http://www.linear.com/product/LT1210#packaging for the most recent package drawings. R Package 7-Lead Plastic DD Pak (Reference LTC DWG # 05-08-1462 Rev F) .256 (6.502) .060 (1.524) TYP .060 (1.524) .390 – .415 (9.906 – 10.541) .165 – .180 (4.191 – 4.572) .045 – .055 (1.143 – 1.397) 15° TYP .060 (1.524) .183 (4.648) +.008 .004 –.004 +0.203 0.102 –0.102 .059 (1.499) TYP .330 – .370 (8.382 – 9.398) ( ) .095 – .115 (2.413 – 2.921) .075 (1.
PAGE 17
LT1210 Package Description Please refer to http://www.linear.com/product/LT1210#packaging for the most recent package drawings. S Package 16-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610 Rev G) .386 – .394 (9.804 – 10.008) NOTE 3 .045 ±.005 .050 BSC 16 N 14 13 12 11 10 9 N .245 MIN .160 ±.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) 1 .030 ±.005 TYP 15 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) .
PAGE 18
LT1210 Package Description Please refer to http://www.linear.com/product/LT1210#packaging for the most recent package drawings. T7 Package 7-Lead Plastic TO-220 (Standard) (Reference LTC DWG # 05-08-1422) .390 – .415 (9.906 – 10.541) .165 – .180 (4.191 – 4.572) .147 – .155 (3.734 – 3.937) DIA .045 – .055 (1.143 – 1.397) .230 – .270 (5.842 – 6.858) .460 – .500 (11.684 – 12.700) .570 – .620 (14.478 – 15.748) .330 – .370 (8.382 – 9.398) .620 (15.75) TYP .700 – .728 (17.780 – 18.491) SEATING PLANE .
PAGE 19
LT1210 Revision History REV DATE DESCRIPTION B 11/15 Added LT1210IR#PBF (Revision history begins at Rev B) PAGE NUMBER 1 to 3, 20 1210fb 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. For more information www.linear.
PAGE 20
LT1210 Typical Application Wideband 9W Bridge Amplifier 15V + LT1210 SD – PO 9W T1* 10nF 1 1 Frequency Response 20 17 1 100nF 220Ω 1 1 910Ω – 14 11 8 5 15V LT1210 SD 23 680Ω –15V + 26 RL 50Ω 9W GAIN (dB) INPUT 5VP-P 1 2 –1 –4 10k 10nF 100k 1M 10M FREQUENCY (Hz) 1210 TA08 * COILTRONICS Versa-Pac™ CTX-01-13033-X2 OR EQUIVALENT 1210 TA07 –15V 100M Related Parts PART NUMBER DESCRIPTION COMMENTS LT1010 Fast ±150mA Power Buffer 20MHz Bandwidth, 75V/µs Slew Rate LT1166 Powe