Datasheet

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LT1229/LT1230

TYPICAL APPLICATIO

APPLICATIO S

DESCRIPTIO

FEATURES

Dual and Quad 100MHz

Current Feedback Amplifiers

The LT

1229/LT1230 dual and quad 100MHz current

feedback amplifiers are designed for maximum perfor-

mance in small packages. Using industry standard pinouts,

the dual is available in the 8-pin miniDIP and the 8-pin SO

package while the quad is in the 14-pin DIP and 14-pin SO.

The amplifiers are designed to operate on almost any

available supply voltage from 4V (±2V) to 30V (±15V).

These current feedback amplifiers have very high input

impedance and make excellent buffer amplifiers. They

maintain their wide bandwidth for almost all closed-loop

voltage gains. The amplifiers drive over 30mA of output

current and are optimized to drive low impedance loads,

such as cables, with excellent linearity at high frequencies.

The LT1229/LT1230 are manufactured on Linear

Technology’s proprietary complementary bipolar process.

For a single amplifier like these see the LT1227 and for

better DC accuracy see the LT1223.

■

100MHz Bandwidth

■

1000V/µs Slew Rate

■

Low Cost

■

30mA Output Drive Current

■

0.04% Differential Gain

■

0.1° Differential Phase

■

High Input Impedance: 25MΩ, 3pF

■

Wide Supply Range: ±2V to ±15V

■

Low Supply Current: 6mA Per Amplifier

■

Inputs Common Mode to Within 1.5V of Supplies

■

Outputs Swing Within 0.8V of Supplies

■

Video Instrumentation Amplifiers

■

Cable Drivers

■

RGB Amplifiers

■

Test Equipment Amplifiers

–

OUT

LT1229 • TA01

12.1k

750Ω

1% RESISTORS

WORST CASE CMRR = 22dB

TYPICALLY = 38dB

OUT

= G (V

– V

–

)

= R

= (G – 1) R

TRIM CMRR WITH R

HIGH INPUT RESISTANCE DOES NOT LOAD CABLE EVEN

WHEN POWER IS OFF

1/2

LT1229

G – 1

187Ω

750Ω

3.01k

–

1/2

LT1229

3.01k3.01k

12.1k

–

BNC INPUTS

Video Loop Through Amplifier

Loop Through Amplifier Frequency

Response

FREQUENCY (Hz)

–60

GAIN (dB)

–50

–40

–30

–20

–10

100 1k 10k 100M

LT1229 • TA02

100k 1M 10M

COMMON MODE SIGNAL

NORMAL SIGNAL

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

Summary of content (16 pages)

PAGE 1
LT1229/LT1230 Dual and Quad 100MHz Current Feedback Amplifiers U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO The LT®1229/LT1230 dual and quad 100MHz current feedback amplifiers are designed for maximum performance in small packages. Using industry standard pinouts, the dual is available in the 8-pin miniDIP and the 8-pin SO package while the quad is in the 14-pin DIP and 14-pin SO. The amplifiers are designed to operate on almost any available supply voltage from 4V (±2V) to 30V (±15V).
PAGE 2
LT1229/LT1230 W W W AXI U U ABSOLUTE RATI GS (Note 1) Supply Voltage ...................................................... ±18V Input Current ...................................................... ±15mA Output Short Circuit Duration (Note 2) ......... Continuous Operating Temperature Range LT1229C, LT1230C ............................... 0°C to 70°C LT1229M, LT1230M (OBSOLETE).. –55°C to 125°C Storage Temperature Range ..................–65°C to 150°C Junction Temperature Plastic Package ...........
PAGE 3
LT1229/LT1230 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Each Amplifier, VCM = 0V, ±5V ≤ VS = ±15V, pulse tested unless otherwise noted. SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage TA = 25°C MIN TYP MAX UNITS ±3 ±10 ±15 mV mV ● Input Offset Voltage Drift IIN + Noninverting Input Current TA = 25°C ±0.
PAGE 4
LT1229/LT1230 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Each Amplifier, VCM = 0V, ±5V ≤ VS = ±15V, pulse tested unless otherwise noted.
PAGE 5
LT1229/LT1230 U W TYPICAL PERFOR A CE CHARACTERISTICS Voltage Gain and Phase vs Frequency, Gain = 6dB 160 6 90 140 GAIN 135 4 180 3 225 2 1 PHASE SHIFT (DEG) 5 VS = ±15V RL = 100Ω RF = 750Ω –2 0.1 160 RF = 500Ω 120 RF = 750Ω 100 80 RF = 1k 60 40 RF = 2k 20 0 1 10 4 6 8 10 14 12 LT1229 • TPC01 21 180 45 160 135 18 180 17 225 16 15 VS = ±15V RL = 100Ω RF = 750Ω 12 0.
PAGE 6
LT1229/LT1230 U W TYPICAL PERFOR A CE CHARACTERISTICS Maximum Capacitance Load vs Feedback Resistor Total Harmonic Distortion vs Frequency 10000 10 RL = 1k PEAKING ≤ 5dB GAIN = 2 1 0 1 2 0.01 VO = 7VRMS –70 100 1k FEEDBACK RESISTOR (kΩ) 10k Output Short-Circuit Current vs Junction Temperature –1.5 –2.0 2.0 V – = –2V TO –18V 1.0 0.5 V– –50 –25 0 25 50 75 70 –0.5 –1.0 RL = ∞ ±2V ≤ VS ≤ ±18V 1.0 0.
PAGE 7
LT1229/LT1230 U W TYPICAL PERFOR A CE CHARACTERISTICS Settling Time to 10mV vs Output Step Settling Time to 1mV vs Output Step INVERTING 4 4 OUTPUT STEP (V) 6 VS = ±15V RF = RG = 1k 0 NONINVERTING 8 6 2 10 –2 –4 9 8 INVERTING SUPPLY CURRENT (mA) NONINVERTING 8 OUTPUT STEP (V) Supply Current vs Supply Voltage 10 10 2 VS = ±15V RF = RG = 1k 0 –2 –4 INVERTING –6 –6 –8 NONINVERTING 0 20 40 60 80 100 0 4 8 12 16 20 SETTLING TIME (µs) SETTLING TIME (ns) 125°C 4 175°C
PAGE 8
LT1229/LT1230 U W U UO APPLICATI S I FOR ATIO The LT1229/LT1230 are very fast dual and quad current feedback amplifiers. Because they are current feedback amplifiers, they maintain their wide bandwidth over a wide range of voltage gains. These amplifiers are designed to drive low impedance loads such as cables with excellent linearity at high frequencies.
PAGE 9
LT1229/LT1230 U W U UO APPLICATI S I FOR ATIO Capacitive Loads The LT1229/LT1230 can drive capacitive loads directly when the proper value of feedback resistor is used. The graph Maximum Capacitive Load vs Feedback Resistor should be used to select the appropriate value. The value shown is for 5dB peaking when driving a 1k load at a gain of 2. This is a worst case condition; the amplifier is more stable at higher gains and driving heavier loads.
PAGE 10
LT1229/LT1230 W U U UO APPLICATI S I FOR ATIO Large-Signal Response, AV = 2, RF = RG = 750Ω Assumptions: 1. The maximum ambient is 70°C for the commercial parts (C suffix) and 125°C for the full temperature parts (M suffix). 2. The load is a double-terminated video cable, 150Ω. 3. The maximum output voltage is 2V (peak or DC). 4.
PAGE 11
LT1229/LT1230 U W U UO APPLICATI S I FOR ATIO Crosstalk and Cascaded Amplifiers The amplifiers in the LT1229/LT1230 do not share any common circuitry. The only thing the amplifiers share is the supplies. As a result, the crosstalk between amplifiers is very low. In a good breadboard or with a good PC board layout the crosstalk from the output of one amplifier to the input of another will be over 100dB down, up to 100kHz and 65dB down at 10MHz.
PAGE 12
LT1229/LT1230 U PACKAGE DESCRIPTIO J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic) (Reference LTC DWG # 05-08-1110) CORNER LEADS OPTION (4 PLCS) 0.005 (0.127) MIN 0.023 – 0.045 (0.584 – 1.143) HALF LEAD OPTION 0.045 – 0.068 (1.143 – 1.727) FULL LEAD OPTION 0.405 (10.287) MAX 8 7 6 5 0.025 (0.635) RAD TYP 0.220 – 0.310 (5.588 – 7.874) 1 2 3 0.300 BSC (0.762 BSC) 4 0.200 (5.080) MAX 0.015 – 0.060 (0.381 – 1.524) 0.008 – 0.018 (0.203 – 0.457) 0° – 15° 0.045 – 0.065 (1.143 – 1.
PAGE 13
LT1229/LT1230 U PACKAGE DESCRIPTIO N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) 0.400* (10.160) MAX 8 7 6 5 1 2 3 4 0.255 ± 0.015* (6.477 ± 0.381) 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) ( 0.065 (1.651) TYP +0.035 0.325 –0.015 8.255 +0.889 –0.381 0.130 ± 0.005 (3.302 ± 0.127) 0.045 – 0.065 (1.143 – 1.651) ) 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 ± 0.003 (0.457 ± 0.076) 0.100 (2.
PAGE 14
LT1229/LT1230 U PACKAGE DESCRIPTIO S Package 14-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) 0.337 – 0.344* (8.560 – 8.738) 14 13 12 11 10 9 8 0.228 – 0.244 (5.791 – 6.197) 0.150 – 0.157** (3.810 – 3.988) 1 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 3 4 5 0.053 – 0.069 (1.346 – 1.752) 0.014 – 0.019 (0.355 – 0.483) TYP *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.
PAGE 15
LT1229/LT1230 U PACKAGE DESCRIPTIO N Package 14-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) 0.770* (19.558) MAX 14 13 12 11 10 9 8 1 2 3 4 5 6 7 0.255 ± 0.015* (6.477 ± 0.381) 0.130 ± 0.005 (3.302 ± 0.127) 0.300 – 0.325 (7.620 – 8.255) 0.045 – 0.065 (1.143 – 1.651) 0.020 (0.508) MIN 0.065 (1.651) TYP 0.009 – 0.015 (0.229 – 0.381) +0.035 0.325 –0.015 0.005 (0.125) MIN 0.100 (2.54) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
PAGE 16
LT1229/LT1230 UO TYPICAL APPLICATI S Single Supply AC Coupled Amplifiers Noninverting 5V 0.1µF Inverting +4.7µF 5V 10k 10kΩ + VIN 10k 1/2 LT1229 + VOUT 0.1µF – 4.7µF + 51Ω +4.7µF 1/2 LT1229 VOUT – 510Ω RS VIN LT1229 • TA09 4.