Datasheet LTC6401-8 (Analog Devices) - 5

LTC6401-8
AC ELECTRICAL CHARACTERISTICS Specifi cations are at TA = 25°C. V+ = 3V, V– = 0V, VOCM = 1.25V,
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E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E = 0V, No RL unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 140MHz Input Signal
HD2,140M/ Second/Third Order Harmonic Distortion VOUT = 2VP-P, RL = 200Ω –78/–59 dBc HD3,140M VOUT = 2VP-P, No RL –87/–70 dBc IMD3,140M Third-Order Intermodulation VOUT = 2VP-P Composite, RL = 200Ω –71 dBc (f1 = 139.5MHz f2 = 140.5MHz) VOUT = 2VP-P Composite, No RL –80 dBc OIP3,140M Equivalent Third-Order Output Intercept VOUT = 2VP-P Composite, No RL (Note 7) 44.2 dBm Point (f1 = 139.5MHz f2 = 140.5MHz) P1dB,140M 1dB Compression Point RL = 375Ω (Notes 5, 7) 18.7 dBm NF140M Noise Figure RL = 375Ω (Note 5) 12.3 dB eIN,140M Input Referred Voltage Noise Density Includes Resistors (Short Inputs) 3.1 nV/√⎯H⎯z eON,140M Output Referred Voltage Noise Density Includes Resistors (Short Inputs) 7.9 nV/√⎯H⎯z IMD3,130M/150M Third-Order Intermodulation VOUT = 2VP-P Composite, RL = 375Ω –75 –67 dBc (f1 = 130MHz f2 = 150MHz) Measure at 170MHz
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings performance from –40°C to 85°C but is not tested or QA sampled at these may cause permanent damage to the device. Exposure to any Absolute temperatures. The LTC6401I is guaranteed to meet specifi ed performance Maximum Rating condition for extended periods may affect device from –40°C to 85°C. reliability and lifetime.
Note 5:
Input and output baluns used. See Test Circuit A.
Note 2:
Input pins (+IN, –IN) are protected by steering diodes to either
Note 6:
Measured using Test Circuit B. RL = 87.5Ω per output. supply. If the inputs go beyond either supply rail, the input current should
Note 7:
Since the LTC6401-8 is a feedback amplifi er with low output be limited to less than 10mA. impedance, a resistive load is not required when driving an AD converter.
Note 3:
The LTC6401C and LTC6401I are guaranteed functional over the Therefore, typical output power is very small. In order to compare the operating temperature range of –40°C to 85°C. LTC6401-8 with amplifi ers that require 50Ω output load, the LTC6401-8
Note 4:
The LTC6401C is guaranteed to meet specifi ed performance from output voltage swing driving a given RL is converted to OIP3 and P1dB as 0°C to 70°C. It is designed, characterized and expected to meet specifi ed if it were driving a 50Ω load. Using this modifi ed convention, 2VP-P is by defi nition equal to 10dBm, regardless of actual RL.
TYPICAL PERFORMANCE CHARACTERISTICS S21 Phase and Group Delay vs Frequency Response Gain 0.1dB Flatness Frequency
14 1.0 0 0.7 TEST CIRCUIT B TEST CIRCUIT B TEST CIRCUIT B 12 0.8 10 0.6 –50 0.6 GROUP DELAY (ns) 8 0.4 6 0.2 4 0 –100 0.5 GAIN (dB) 2 –0.2 PHASE (DEGREE) 0 GAIN FLATNESS (dB) –0.4 –150 0.4 –2 –0.6 –4 –0.8 PHASE GROUP DELAY –6 –1.0 –200 0.3 10 100 1000 3000 10 100 1000 3000 0 200 400 600 800 1000 FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz) 64018 G01 64018 G02 64018 G03 64018f 5