ltc6420 Linear Technology Corporation, ltc6420 Datasheet
ltc6420
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ltc6420 Summary of contents
Page 1
... ADCs with low noise and low distortion, but can also be used as a general-purpose broadband gain block. The LTC6420-20 is easy to use, with minimal support circuitry required. The output common mode voltage is set using an external pin, independent of the inputs, which eliminates the need for transformers or AC-coupling capacitors in many applications ...
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... ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LTC6420CUDC-20#PBF LTC6420CUDC-20#TRPBF LDDM LTC6420IUDC-20#PBF LTC6420IUDC-20#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. Consult LTC Marketing for information on non-standard lead based fi nish parts. ...
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... Differential, Includes Parasitic Differential Input Common Mode Voltage 1.1V to 1.6V OCM V = 1.25V to 1.5V OCM ENABLEx ≤ 0.8V ENABLEx ≥ 2.4V ENABLEx ≤ 0.8V; per Amplifi er ENABLEx ≥ 2.4V; per Amplifi er. Inputs Floating + V = 2.85V to 3.5V LTC6420-20 = 1.25V, ENABLE = 0V unless L MIN TYP MAX UNITS l 19 ±0.1 ±0.25 ...
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... Note 5: Input and output baluns used. See Test Circuit A. Note 6: Measured using Test Circuit B. R Note 7: Since the LTC6420- feedback amplifi er with low output impedance, a resistive load is not required when driving an AD converter. Therefore, typical output power is very small. In order to compare the LTC6420-20 with amplifi ...
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... GROUP DELAY –400 1000 3000 0 200 642020 G04 Input and Output Impedance vs Frequency 250 200 150 100 PHASE IMPEDANCE MAGNITUDE 1000 3000 642020 G06 LTC6420-20 Channel to Channel Phase Match vs Frequency 0.5 0.4 0.3 0.2 0.1 0.0 –0.1 –0.2 –0.3 –0.4 –0.5 10 100 FREQUENCY (MHz) 1.2 TEST CIRCUIT B 0.9 0.6 ...
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... LTC6420-20 TYPICAL PERFORMANCE CHARACTERISTICS Noise Figure and Input Referred Noise Voltage vs Frequency NOISE FIGURE 100 1000 FREQUENCY (MHz) 642020 G08 Harmonic Distortion vs Frequency –40 DIFFERENTIAL INPUT OUT P-P –50 –60 –70 –80 – ...
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... R R OUT G 12.5Ω 100Ω – 1000Ω ENABLEB +OUTB OCMB LTC6420-20 (Pins 19, 8): These pins set the output – . The Exposed Pad must be con- 16 –OUTA + – – –OUTB 640020 BD 642020f 7 ...
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... Small output resistors of 12.5Ω improve the circuit stability over various load conditions. The LTC6420-20 is very fl exible in terms of I/O coupling. It can be AC- or DC-coupled at the inputs, the outputs or both. If the inputs are AC-coupled, the input common mode voltage is automatically biased close external circuitry is needed for bias ...
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... T level of 1.5V. Both ICs are powered from the same 3V supply voltage. The inputs to the LTC6420-20 can be confi gured in various ways, as described in the Input Impedance and Matching section of this data sheet. The outputs of the LTC6420-20 may be connected directly to the analog inputs of an ADC simple lowpass or bandpass fi ...
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... C35 C39 C32 [1] C32 J6 0.1μF 0.1μ 1000pF –OUTB R12 2 R14 88.7 [1] C40 1 5 0.1μF J8 TCM4-19+ R15 1 2 +OUTB C44 88.7 C41 0.1μF [1] VERSION U1 R5, R9, R10, R13 T1, T3 –C LTC6420CUDC-20 NONE TCM4-19+ –G LTC6421CUDC-20 NONE TCM4-19+ 642020 F04b 642020f ...
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... LTC6420-20 3.3V 3.3V R5 49.9Ω 1/2 R6 LTC6420- 49.9Ω 12pF 10Ω 12pF 10Ω 49.9Ω C3 1/2 12pF R8 LTC6420-20 49.9Ω V –3dB FILTER BANDWIDTH = 120MHz OCM R1 R2 1.21k 1k PIN 1 NOTCH R = 0.20 OR 0.25 0.75 ± 0.05 × 45° CHAMFER 1.50 REF R = 0.05 TYP 19 20 0.40 ± 0. 2.65 ± 0.10 2.50 REF 1.65 ± 0.10 (UDC20) QFN 1106 REV Ø ...
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... McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● 40.2Ω 10Ω 12pF IN LTC6420-20 40.2Ω 10Ω C3 12pF –3dB FILTER BANDWIDTH = 140MHz COMMENTS A = 2V/V, OIP3 = 38dBm at 70MHz 4V/V, OIP3 = 40dBm at 70MHz 10V/V, OIP3 = 40dBm at 70MHz V 16-Bit SNR and SFDR at 1MHz, Rail-to-Rail Outputs OIP3 = 47dBm at 100MHz, Gain Control Range 10 ...