Datasheet

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LT1210

1210fa

1.1A, 35MHz Current

Feedback Amplifier

■

1.1A Minimum Output Drive Current

■

35MHz Bandwidth, A

= 2, R

= 10

Ω

■

900V/

s Slew Rate, A

= 2, R

= 10

Ω

■

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

■

Available in 7-Lead DD, TO-220 and

16-Lead SO Packages

The LT

1210 is a current feedback amplifier with high

output current and excellent large-signal characteristics.

The combination 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 applica-

tions the device is also available in a low thermal resis-

tance SO-16 package.

■

Cable Drivers

■

Buffers

■

Test Equipment Amplifiers

■

Video Amplifiers

■

ADSL Drivers

–

LT1210

4.7µF*

100nF

1210 TA01

11Ω

2.5W

T1**

845Ω

274Ω

100nF

15V

–15V

* TANTALUM

** MIDCOM 671-7783 OR EQUIVALENT

100Ω

2.5W

Total Harmonic Distortion vs Frequency

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

Twisted Pair Driver

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

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

All other trademarks are the property of their respective owners.

Summary of content (16 pages)

PAGE 1
LT1210 1.1A, 35MHz Current Feedback Amplifier U FEATURES DESCRIPTIO ■ 1.
PAGE 2
LT1210 W W W AXI U U ABSOLUTE RATI GS (Note 1) Supply Voltage ..................................................... ±18V Input Current .................................................... ±15mA Output Short-Circuit Duration (Note 2) ....... Continuous Specified Temperature Range (Note 3) ...... 0°C to 70°C Operating Temperature Range ............... –40°C to 85°C Junction Temperature ......................................... 150°C Storage Temperature Range .................
PAGE 3
LT1210 ELECTRICAL CHARACTERISTICS The ● denotes 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 W SMALL-SIGNAL BANDWIDTH U U RSD = 0Ω, IS = 30mA, VS = ±5V, Peaking ≤ 1dB RSD = 0Ω, IS = 35mA, VS = ±15V, Peaking ≤ 1dB AV RL RF RG – 3dB BW (MHz) –1 150 30 10 150 30 10 150 30 10 150 30 10 549 590 619 604 649 619 562 590 576 392 383 215 549 590 619 – – – 562 590 576 43.2 42.2 23.7 52.5 39.7 26.5 53.5 39.7 27.4 51.8 38.8 27.4 48.4 40.3 36.0 1 2 10 RSD = 7.
PAGE 5
LT1210 W U TYPICAL PERFOR A CE CHARACTERISTICS Bandwidth vs Supply Voltage 50 100 –3dB BANDWIDTH (MHz) 70 RF = 560Ω 50 RF = 750Ω 40 RF = 680Ω 30 RF = 1k 40 RF = 560Ω 30 RF = 750Ω RF = 1k 20 RF = 2k 10 20 FEEDBACK RESISTANCE AV = 2 RL = ∞ VS = ±15V CCOMP = 0.
PAGE 6
LT1210 W U TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Ambient Temperature, VS = ±5V Supply Current vs Supply Voltage 40 40 40 RSD = 0Ω 35 SUPPLY CURRENT (mA) TA = 25°C 36 TA = 85°C 34 32 30 TA = –40°C 28 TA = 125°C 26 AV = 1 RL = ∞ RSD = 0Ω 35 30 25 SUPPLY CURRENT (mA) 38 SUPPLY CURRENT (mA) Supply Current vs Ambient Temperature, VS = ±15V RSD = 7.5k 20 15 RSD = 15k 10 RSD = 0Ω 30 25 RSD = 47.5k 20 15 RSD = 82.
PAGE 7
LT1210 W U TYPICAL PERFOR A CE CHARACTERISTICS Output Impedance in Shutdown vs Frequency Output Impedance vs Frequency 10k OUTPUT IMPEDANCE (Ω) 10 RSD = 82.5k RSD = 0Ω 1 0.1 0.
PAGE 8
LT1210 U W U UO S I FOR ATIO The LT1210 is a current feedback amplifier with high output current drive capability. The device is stable with large capacitive loads and can easily supply the high currents required by capacitive loads. The amplifier will drive low impedance loads such as cables with excellent linearity at high frequencies.
PAGE 9
LT1210 W U U UO APPLICATI S I FOR ATIO 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 RG 24k 15V ENABLE 1210 F02 Figure 2. Shutdown Interface RF = 750Ω RL = 10Ω IQ = 9mA, 18mA, 36mA VS = ±15V 1210 F04a Figure 4a.
PAGE 10
LT1210 W U U UO APPLICATI S I FOR ATIO the 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 11
LT1210 U W U UO APPLICATI S I FOR ATIO 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 12
LT1210 W U U UO APPLICATI S I FOR ATIO 5V T7 Package, 7-Lead TO-220 Thermal Resistance (Junction-to-Case) = 5°C/W 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 13
LT1210 U TYPICAL APPLICATIONS Buffer AV = 1 Distribution Amplifier + VIN 75Ω 75Ω VIN 75Ω CABLE – + LT1210 COMP SD LT1210 SD – 75Ω RF VOUT 0.01µF* 75Ω RF** * OPTIONAL, USE WITH CAPACITIVE LOADS ** VALUE OF RF DEPENDS ON SUPPLY VOLTAGE AND LOADING. SELECT FROM TYPICAL AC PERFORMANCE TABLE OR DETERMINE EMPIRICALLY RG 1210 TA06 75Ω 1210 TA05 W W SI PLIFIED SCHE ATIC V+ TO ALL CURRENT SOURCES Q5 Q10 Q2 Q18 D1 Q6 Q1 Q17 Q11 Q15 Q9 V– 1.
PAGE 14
LT1210 U PACKAGE DESCRIPTION R Package 7-Lead Plastic DD Pak (Reference LTC DWG # 05-08-1462) .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 (1.905) .300 (7.620) +.012 .143 –.020 +0.305 3.632 –0.
PAGE 15
LT1210 U PACKAGE DESCRIPTION S Package 16-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .386 – .394 (9.804 – 10.008) NOTE 3 .045 ±.005 .050 BSC 16 N 15 13 14 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 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT 2 1 .010 – .020 × 45° (0.254 – 0.508) 3 5 4 6 7 8 .053 – .069 (1.346 – 1.752) .008 – .010 (0.203 – 0.254) .004 – .010 (0.101 – 0.
PAGE 16
LT1210 U TYPICAL APPLICATION Wideband 9W Bridge Amplifier 15V INPUT 5VP-P Frequency Response + LT1210 SD – PO 9W 26 T1* 10nF 1 RL 50Ω 9W 23 20 1 17 GAIN (dB) 680Ω –15V 1 100nF 220Ω LT1210 SD + 11 8 5 1 15V 1 910Ω – 14 1 2 –1 –4 10k 100k 10nF 1M 10M FREQUENCY (Hz) 100M 1210 TA08 * COILTRONICS Versa-PacTM CTX-01-13033-X2 OR EQUIVALENT 1210 TA07 –15V RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1010 Fast ±150mA Power Buffer 20MHz Bandwidth, 75V/µs Slew Rate LT1166