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Part: LT1254
Category:
Analog & Mixed-Signal Processing
-> Amplifiers
-> Operational Amplifiers
-> General Purpose
-> Quad
Description: LT1254, Low Cost Quad Video Amplifier
Company: Linear Technology Corporation
Datasheet: Download LT1254 datasheet File size : 467 kB
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Datasheet text preview:
LT1253/LT1254 Low Cost Dual and Quad Video Amplifiers
FEATURES
s s s s s s s s
DESCRIPTIO
Low Cost Current Feedback Amplifiers Differential Gain: 0.03%, RL = 150, VS = ±5V Differential Phase: 0.28°, RL = 150, VS = ±5V Flat to 30MHz, 0.1dB 90MHz Bandwidth on ±5V Wide Supply Range: ±2V(4V) to ±14V(28V) Low Power: 60mW per Amplifier at ±5V
The LT1253 is a low cost dual current feedback amplifier for video applications. The LT1254 is a quad version of the LT1253. The amplifiers are completely isolated except for the power supply pins and therefore have excellent isolation, over 94dB at 5MHz. Dual and quad amplifiers significantly reduce costs compared with singles; the number of insertions is reduced and fewer supply bypass capacitors are required. In addition, these duals and quads cost less per amplifier than single video amplifiers. The LT1253/LT1254 amplifiers are ideal for driving low impedance loads such as cables and filters. The wide bandwidth and high slew rate of these amplifiers make driving RGB signals between PCs and workstations easy. The excellent linearity of these amplifiers makes them ideal for composite video. The LT1253 is available in 8-pin DIPs and the S8 surface mount package. The LT1254 is available in 14-pin DIPs and the S14 surface mount package. Both parts have the industry standard dual and quad op amp pin out. For higher performance, see the LT1229/LT1230.
APPLICATI
s s s
S
RGB Cable Drivers Composite Video Cable Drivers Gain Blocks in IF Stages
TYPICAL APPLICATI
5V VIN + 1/2 LT1253 5V 6 RF 20 6G R 20
Transient Response
75
C 75 ABLE
VOUT 75
AV = 1 +
RF
G
BW = 90MHz
AT AMPLIFIER OUTPUT. 6dB LESS AT VOUT.
LT1253/54 · TA01
VS = ±5V AV = 2 RL = 150 VO = 1V
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LT1253/54 · TA02
UO
UO
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LT1253/ LT1254 ABSOLUTE AXI U RATI GS
Storage Temperature Range ....... 65°C to 150°C Junction Temperature (Note 2) .... 150°C Lead Temperature (Soldering, 10 sec)........ 300°C Total Supply Voltage (V + to V ) ..... 28V Input Current ..... ±15mA Output Short-Circuit Duration (Note 1) ........ Continuous Operating Temperature Range LT1253C, LT1254C......... 0°C to 70°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW UT A IN A +IN A V 1 2 A 3 4 B 6 5 IN B +IN B 8 7 V+ OUT B
ORDER PART NUMBER LT1253CN8 LT1253CS8 S8 PART MARKING 1253
N8 PACKAGE 8 S8 PACKAGE 8-LEAD PLASTIC DIP -LEAD PLASTIC SOIC O TJMAX = 150°C, JA = 100°C/ W (N) TJMAX = 150°C, JA = 150°C/ W (S)
ELECTRICAL CHARACTERISTICS
Symbol V OS +IB IB AVOL PSRR CMRR V OUT I OUT IS RIN C IN Parameter Input Offset Voltage Noninverting Bias Current Inverting Bias Current Large-Signal Voltage Gain Power Supply Rejection Ratio Common-Mode Rejection Ratio Maximum Output Voltage Swing Maximum Output Current Supply Current Input Resistance Input Capacitance Power Supply Range Channel Separation SR Input Slew Rate Output Slew Rate Dual Single
0°C TA 70°C, VS = ±5V to ±12V, unless otherwise noted.
MIN TYP 5 1 20 MAX 15 15 100 UNITS mV µA µA V/ V dB dB V V mA 11 mA M pF ± 12 24 88 125 250 V V dB V/µs V/µs
CONDITIONS
VS = ±5V, VO = ±2V, RL = 150 VS = ±3V to ±12V VS = ±5V, VCM = ±2V VS = ±12V, RL = 500 VS = ±5V, RL = 150 Per Amplifier
f = 10MHz AV = 1 AV = 2
2
U
U
W
WW
U
W
TOP VIEW
OUT A
1 2 3 4 5 6 7 B C A D
14 OUT D 13 IN D 12 +IN D 11 V 10 +IN C 9 8
IN C
OUT C
ORDER PART NUMBER LT1254CN LT1254CS
IN A +IN A V+ +IN B IN B
OUT B
N PACKAGE 14-LEAD PLASTIC DIP
1
S PACKAGE 4-LEAD PLASTIC SOIC
TJMAX = 150°C, JA = 70°C/ W (N) TJMAX = 150°C, JA = 100°C/ W (S)
560 60 55 ± 7.0 ± 2.5 30 1 ±2 4
1500 70 65 ± 10.5 ± 3.7 55 6 10 3
LT1253/LT1254
ELECTRICAL CHARACTERISTICS
Symbol tr tp Parameter Small-Signal Rise Time Rise and Fall Time Propagation Delay
0°C TA 70°C, VS = ±5V to ±12V, unless otherwise noted.
MIN TYP 3.5 5.8 3.5 MAX UNITS ns ns ns
CONDITIONS VS = ±12V, AV = 2 VS = ±5V, AV = 2, VOUT = 1VP-P VS = ±5V, AV = 2
Note 1: A heat sink may be required to keep the junction temperature below absolute maximum when the output is shorted indefinitely. Note 2: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas:
LT1253CN8: TJ = TA + (PD × 100°C/W) LT1253CS8: TJ = TA + (PD × 150°C/W) LT1254CN: TJ = TA + (PD × 70°C/W) LT1254CS: TJ = TA + (PD × 100°C/W)
TYPICAL AC PERFOR A CE
BANDWIDTH
VS ± 12 ± 12 ± 12 ± 12 ± 12 ± 12 ± 12 ± 12 ± 12 ± 12 ±5 ±5 ±5 ±5 ±5 ±5 ±5 ±5 ±5 ±5 AV 1 1 1 1 2 2 5 5 10 10 1 1 1 1 2 2 5 5 10 10 RL 1000 150 1000 150 1000 150 1000 150 1000 150 1000 150 1000 150 1000 150 1000 150 1000 150 RF 1100 1000 750 768 715 715 680 680 620 620 787 787 715 715 620 620 620 620 562 562 RG None None 150 768 715 715 180 180 68.1 68.1 None None 715 715 620 620 150 150 61.9 61.9 Small Signal 3dB BW (MHz) 270 204 110 89 179 117 106 90 89 80 218 158 76 70 117 92 82 72 70 65 Small Signal 0.1dB BW (MHz) 51 48 59 50 76 62 42 47 49 46 53 91 28 30 58 52 36 34 35 28 Small Signal Peaking (dB) 3.4 1.3 0.1 0.1 0.3 0 0 0 0.1 0.1 1.5 0.1 0.1 0.1 0.1 0.1 0 0 0 0
NTSC VIDEO (Note 1)
VS ± 12 ±12 ±5 ±5 AV 2 2 2 2 RL 1000 150 1000 150 RF 750 750 750 750 RG 750 750 750 750 DIFFERENTIAL GAIN 0.01% 0.01% 0.03% 0.03% DIFFERENTIAL PHASE 0.03° 0.12° 0.18° 0.28°
Note 1: Differential Gain and Phase are measured using a Tektronix TSG 120 YC/NTSC signal generator and a Tektronix 1780R Video Measurement Set. The resolution of this equipment is 0.1% and 0.1°. Ten identical
UW
amplifier stages were cascaded giving an effective resolution of 0.01% and 0.01°.
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