LT6402 Linear Technology Corporation, LT6402 Datasheet
LT6402
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LT6402 Summary of contents
Page 1
... The LT6402-20 is designed to meet the demanding require- ments of communications transceiver applications. It can be used as a differential ADC driver, a general-purpose differential gain block other applications requiring differential drive. The LT6402-20 can be used in data acquisition systems required to function at frequencies down to DC. The LT6402-20 operates supply and consumes 30mA. It comes in a compact 16-lead 3mm × ...
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... JMAX JA JC EXPOSED PAD IS V (PIN 17) EE MUST BE SOLDERED TO THE PCB UD PART MARKING* LT6402CUD-20 LCBC LT6402IUD-20 LCBC http://www.linear.com/leadfree/ = 0V, ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0.8V, +INA = 5V EEA EEB EEC unless otherwise noted. LOAD MIN ...
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... Average of +OUT and –OUT OCM ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0.8V ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0.8V ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 5.5V LT6402-20 = 0V, ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0.8V, +INA = EEA EEB EEC unless otherwise noted ...
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... LT6402-20 AC ELECTRICAL CHARACTERISTICS ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0.8V, +INA shorted to +INB (+IN), –INA shorted to –INB (–IN), V unless otherwise noted. SYMBOL PARAMETER Input/Output Characteristics –3dBBW –3dB Bandwidth 0.1dBBW Bandwidth for 0.1dB Flatness 0.5dBBW Bandwidth for 0.5dB Flatness SR Slew Rate t 1% Settling s1% ...
Page 5
... The LT6402I is guaranteed to meet specifi ed performance from –40°C to 85°C. Note 5: Since the LT6402- feedback amplifi er with low output impedance, a resistive load is not required when driving an ADC. Therefore, typical output power is very small. In order to compare the ...
Page 6
... LT6402- TYPICAL PERFOR A CE CHARACTERISTICS Third Order Intermodulation Distortion vs Frequency Differential Input LOAD –60 2 TONES, 2V COMPOSITE P-P 1MHz TONE SPACING –65 –70 –75 UNFILTERED OUTPUTS –80 –85 –90 –95 FILTERED OUTPUTS –100 –105 –110 FREQUENCY (MHz) 64022 G04 ...
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... UNFILTERED OUTPUTS 110 100 PSRR CMRR 100 FREQUENCY (MHz) LT6402-20 Isolation vs Frequency –30 UNFILTERED OUTPUTS –40 –50 –60 –70 –80 –90 –100 –110 1000 1 10 100 FREQUENCY (MHz) 64022 G16 Input Refl ection Coeffi cient ...
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... FREQUENCY (MHz) Distortion vs Output Common Mode Voltage LT6402-20 Driving LTC2249 14-Bit ADC –80 FILTERED OUTPUTS LOAD V = 20MHz 2V OUT P-P –82 HD3 –84 –86 HD2 –88 –90 1 1.2 1.4 1.6 1.8 ...
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... E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ E (Pin 11): This pin is a TTL logic input referenced to the V CC EEC typically 30mA of supply current. If high, the LT6402 is disabled and draws typically 250µA. +INA, +INB (Pins 15, 16): Positive Inputs. These pins are normally tied together. These inputs may be DC- or AC- coupled ...
Page 10
... AC-coupling capacitors. Input Impedance and Matching Networks Calculation of the input impedance of the LT6402-20 is not straightforward from examination of the block diagram because of the internal feedback network. In addition, the input impedance when driven differentially is different than when driven single-ended ...
Page 11
... Figure 3. Alternate Input Termination for Differential 50Ω Input Impedance W U and fi ltered outputs of the LT6402-20 can easily drive the high impedance inputs of these differential ADCs. If the fi ltered outputs are used, then cutoff frequency and the type of fi lter can be tailored for the specifi c application if needed ...
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... Pins) Filtering at the output of the LT6402-20 is often desired to provide either anti-aliasing or improved signal to noise ratio. To simplify this fi ltering, the LT6402-20 includes an additional pair of differential outputs (+OUTFILTERED and –OUTFILTERED) which incorporate an internal lowpass fi lter network with a –3dB bandwidth of 75MHz (Figure 5). ...
Page 13
... SNR 4dB Input Bias Voltage and Bias Current The input pins of the LT6402-20 are internally biased to the voltage applied to the V resistors are needed, even for AC-coupled operation. The input bias current is determined by the voltage difference between the input common mode voltage and the V pin (which sets the output common mode voltage) ...
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... LT6402-20 U TYPICAL APPLICATIO 14 Top Silkscreen 640220fa ...
Page 15
... Plastic QFN (3mm × 3mm) (Reference LTC DWG # 05-08-1691) 0.70 ±0.05 PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC 0.75 ± 0.05 3.00 ± 0.10 (4 SIDES) 1.45 ± 0.10 (4-SIDES) 0.200 REF 0.00 – 0.05 LT6402-20 BOTTOM VIEW—EXPOSED PAD PIN 1 NOTCH R = 0.20 TYP R = 0.115 OR 0.25 × 45° CHAMFER TYP 15 16 0.40 ± 0. (UD16) QFN 0904 0.25 ± 0.05 0.50 BSC ...
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... R10 V ENABLE V V EEC CCB EEB 24.9Ω –INB –OUT R8 [ –INA –OUTFILTERED LT6402-20 [1] [ +INB +OUTFILTERED R9 24.9Ω +INA +OUT CCC OCM CCA EEA ...