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Part: LT1256CN
Category:
Analog & Mixed-Signal Processing
-> Amplifiers
-> Operational Amplifiers
-> High Speed
Description: LT1256, 40MHz Video DC Gain Controlled Amplifier
Company: Linear Technology Corporation
Datasheet: Download LT1256CN datasheet File size : 467 kB
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Datasheet text preview:
LT1251/LT125 6 40MHz Video Fader and DC Gain Controlled Amplifier
FEATURES
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DESCRIPTION
The LT ®1251/LT1256 are 2-input, 1-output, 40MHz current feedback amplifiers with a linear control circuit that sets the amount each input contributes to the output. These parts make excellent electronically controlled variable gain amplifiers, filters, mixers and faders. The only external components required are the power supply bypass capacitors and the feedback resistors. Both parts operate on supplies from ±2.5V (or single 5V) to ±15V (or single 30V). Absolute gain accuracy is trimmed at wafer sort to minimize part-to-part variations. The circuit is completely temperature compensated. The LT1251 includes circuitry that eliminates the need for accurate control signals around zero and full scale. For control signals of less than 2% or greater than 98%, the LT1251 sets one input completely off and the other completely on. This is ideal for fader applications because it eliminates off-channel feedthrough due to offset or gain errors in the control signals. The LT1256 does not have this on/off feature and operates linearly over the complete control range. The LT1256 is recommended for applications requiring more than 20dB of linear control range.
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Accurate Linear Gain Control: ±1% Typ, ±3% Max Constant Gain with Temperature Wide Bandwidth: 40MHz High Slew Rate: 300V/µs Fast Control Path: 10MHz Low Control Feedthrough: 2.5mV High Output Current: 40mA Low Output Noise 45nV/Hz at AV = 1 270nV/Hz at AV = 100 Low Distortion: 0.01% Wide Supply Range: ±2.5V to ±15V Low Supply Current: 13mA Low Differential Gain and Phase: 0.02%, 0.02°
APPLICATIONS
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Composite Video Gain Control RGB, YUV Video Gain Control Video Faders, Keyers Gamma Correction Amplifiers Audio Gain Control, Faders Multipliers, Modulators Electronically Tunable Filters
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Two-Input Video Fader
4 5 IN1 2 1
+
LT1256 Gain Accuracy vs Control Voltage
3 VS = ±5V VFS = 2.5V
LT1251/LT1256
+ +
14 2
+
IN2
GAIN ACCURACY (%)
3 0V TO 2.5V CONTROL IC 4 5 6 NULL V 7
1 CONTROL C 5k IC IFS
2 1 0 1 2 3
13 12 2.5VDC I NPUT 11 IFS 90 8 V+
FS 5k
1 RF2 .5k
RF1 1 .5k
4 GAIN ACCURACY (%) = AVMEAS 5 0 VOUT
1251/56 TA01
0.5
U
U
U
(
2C V 100 .5
)(
)
2.5
1.5 2.0 1.0 CONTROL VOLTAGE (V)
1251/56 TA02
1
LT1251/LT125 6
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V + to V ) ...... 36V Input Current ...... ± 15mA Input Voltage on Pins 3,4,5,10,11,12 ...... V to V + Output Short-Circuit Duration (Note 1) ........ Continuous Specified Temperature Range (Note 2) ....... 0°C to 70°C Operating Temperature Range ...... 40°C to 85°C Storage Temperature Range ........ 65°C to 150°C Junction Temperature (Note 3).... 150°C Lead Temperature (Soldering, 10 sec)......... 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW FN1 I B1 V IC RC N
C
2 1 3 4 5 6 7
+ +
+
14 13 12 11 9 0 8
F IN2 VB2 I FS RS F V FS V+
OUT
ORDER PART NUMBER LT1251CN LT1251CS LT1256CN LT1256CS
(Note 2)
1 CONTROL
2
+
C
FS
UVL L
N PACKAGE 14-LEAD PDIP
S PACKAGE 14-LEAD PLASTIC SO
TJMAX = 150°C, JA = 70°C/ W (N) TJMAX = 150°C, JA = 100°C/ W (S)
Consult factory for Industrial and Military grade parts.
SIG AL A PLIFIER AC CHARACTERISTICS
0°C TA 70°C, VS = ±5V, VIN = 1VRMS, f = 1kHz, AVMAX = 1, RF1 = RF2 = 1.5k, VFS = 2.5V, IC = IFS = NULL = Open, Pins 5,10 = GND, unless otherwise noted.
SYMBOL 2%IN1 10%IN1 20%IN1 30%IN1 40%IN1 50%IN1 60%IN1 70%IN1 80%IN1 90%IN1 98%IN1 2%IN2 10%IN2 20%IN2 30%IN2 40%IN2 50%IN2 60%IN2 70%IN2 80%IN2 90%IN2 98%IN2 PARAMETER 2% Input 1 Gain 10% Input 1 Gain 20% Input 1 Gain 30% Input 1 Gain 40% Input 1 Gain 50% Input 1 Gain 60% Input 1 Gain 70% Input 1 Gain 80% Input 1 Gain 90% Input 1 Gain 98% Input 1 Gain 2% Input 2 Gain 10% Input 2 Gain 20% Input 2 Gain 30% Input 2 Gain 40% Input 2 Gain 50% Input 2 Gain 60% Input 2 Gain 70% Input 2 Gain 80% Input 2 Gain 90% Input 2 Gain 98% Input 2 Gain Gain Drift with Temperature (Worst Case at 30% Gain) CONDITIONS VC (Pin 3) = 0.05V VC (Pin 3) = 0.25V VC (Pin 3) = 0.50V VC (Pin 3) = 0.75V VC (Pin 3) = 1.00V VC (Pin 3) = 1.25V VC (Pin 3) = 1.50V VC (Pin 3) = 1.75V VC (Pin 3) = 2.00V VC (Pin 3) = 2.25V VC (Pin 3) = 2.45V VC (Pin 3) = 2.45V VC (Pin 3) = 2.25V VC (Pin 3) = 2.00V VC (Pin 3) = 1.75V VC (Pin 3) = 1.50V VC (Pin 3) = 1.25V VC (Pin 3) = 1.00V VC (Pin 3) = 0.75V VC (Pin 3) = 0.50V VC (Pin 3) = 0.25V VC (Pin 3) = 0.05V VC (Pin 3) = 0.75V VC (Pin 3) = 0.75V LT1251 LT1256
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LT1251 LT1256 LT1251 LT1256
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LT1251 LT1256 N Package S Package
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MIN 0 0.1 7 17 27 37 47 57 67 77 87 99.9 95.0 0 0.1 7 17 27 37 47 57 67 77 87 99.9 95.0
TYP
MAX 0.1 5.0 13 23 33 43 53 63 73 83 93 100.0 99.9 0.1 5.0 13 23 33 43 53 63 73 83 93 100.0 99.9
50 400
UNITS % % % % % % % % % % % % % % % % % % % % % % % % % % ppm/°C ppm/°C
2
U
W
U
U
WW
W
W
U
LT1251/LT125 6
SIG AL A PLIFIER AC CHARACTERISTICS
0°C TA 70°C, VS = ±5V, VIN = 1VRMS, f = 1kHz, AVMAX = 1, RF1 = RF2 = 1.5k, VFS = 2.5V, IC = IFS = NULL = Open, Pins 5,10 = GND, unless otherwise noted.
SYMBOL PARAMETER Gain Supply Rejection External Resistor Gain 50% Input 1 Slew Rate Control Feedthrough Full Power Bandwidth Small-Signal Bandwidth Differential Gain (Notes 4,5) Differential Phase (Notes 4,5) THD Total Harmonic Distortion CONDITIONS VC = 1.25V, VS = ±5V to ±15V Pins 5,10 = Open, External 5k Resistors from Pins 4,11 to Ground, VC = 1.25V VIN = ±2.5V, VO at ±2V, RL = 150 VC = 1.25VDC + 2.5VP-P at 1kHz VO = 1VRMS VS = ±5V VS = ±15V Control = 0% or 100% Control = 25% or 75% Control = 0% or 100% Control = 25% or 75% Gain = 100% Gain = 50% Gain = 10% 10% to 90%, VO = 100mV VO = 100mV VO = 100mV 0.1%, VO = 2V MIN
q q q
SR
BW
t r, tf OS t PD tS
Rise Time, Fall Time Overshoot Propagation Delay Settling Time
SIG AL A PLIFIER DC CHARACTERISTICS
SYMBOL VOS PARAMETER Input Offset Voltage Input Offset Voltage Drift Noninverting Input Bias Current Inverting Input Bias Current Inverting Input Bias Current Null Change Input Noise Voltage Density Noninverting Input Noise Current Density Inverting Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio Inverting Input Current Common Mode Rejection PSRR Power Supply Rejection Ratio Noninverting Input Current Power Supply Rejection Inverting Input Current Power Supply Rejection
0°C TA 70°C, VS = ±5V, VCM = 0V, VFS = 2.5V, IC = IFS = NULL = Open, Pins 5,10 = GND, unless otherwise noted.
CONDITIONS Either Input Difference Between Inputs Either Input Either Input Difference Between Inputs Null (Pin 6) Open to V f = 1kHz f = 1kHz f = 1kHz Either Noninverting Input Either Noninverting Input VS = ±5V VS = 5V VCM = 3V to 3V VS = 5V, VCM = 2V to 3V, VO = 2.5V VCM = 3V to 3V VS = 5V, VCM = 2V to 3V, VO = 2.5V VS = ±5V to ±15V VS = ±5V to ±15V VS = ±5V to ±15V MIN
q q q q q q
IIN+ IIN
en + in in RIN CIN
CMRR
W
W
U
U
TYP 0.03
45 150 300 2.5 20 30 40 0.02 0.90 0.02 0.55 0.002 0.015 0.4 11 3 10 65
MAX 0.10 55
UNITS %/ V % V/ µs mVP-P MHz MHz MHz % % DEG DEG % % % ns % ns ns
3 2.5 30 1 280
q q q q q q q q q q q
5 ±3 2 55 50
TYP 2 1 10 0.5 10 0.5 170 2.7 1.5 29 17 1.5 ± 3.2 61 57 0.07 0.17 76 30 30
MAX 5 3 2.5 30 1 60
3
0.25 0.70 100 200
70
UNITS mV mV µV/ °C µA µA µA µA nV/Hz pA/Hz pA/Hz M pF V V dB dB µA / V µA / V dB nA / V nA / V
3
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