Datasheet LTC6421-20 (Analog Devices) - 4

LTC6421-20
AC ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. V+ = 3V, V– = 0V, VOCM = 1.25V, ENABLE = 0V, No RL unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ΔG Gain Matching f = 100MHz (Note 9) l ±0.1 ±0.25 dB ΔP Phase Matching f = 100MHz ±0.2 deg Channel Separation (Note 8) f = 100MHz 80 dB –3dBBW –3dB Bandwidth 200mVP-P, OUT (Note 6) 1.3 GHz 0.5dBBW Bandwidth for 0.5dB Flatness 200mVP-P, OUT (Note 6) 250 MHz 0.1dBBW Bandwidth for 0.1dB Flatness 200mVP-P, OUT (Note 6) 130 MHz NF Noise Figure RL = 375Ω (Note 5), f = 100MHz 6.2 dB eIN Input Referred Voltage Noise Density Includes Resistors (Short Inputs), f = 100MHz 2.2 nV/√Hz eON Output Referred Voltage Noise Density Includes Resistors (Short Inputs), f = 100MHz 22 nV/√Hz 1/f 1/f Noise Corner 12.5 kHz SR Slew Rate Differential (Note 6) 4500 V/μs tS1% 1% Settling Time 2VP-P, OUT (Note 6) 2 ns tOVDR Overdrive Recovery Time 1.9VP-P, OUT (Note 6) Single Ended 7 ns P1dB 1dB Compression Point RL = 375Ω (Notes 5, 7), f = 100MHz 18 dBm tON Turn-On Time +OUT, –OUT Within 10% of Final Values 80 ns tOFF Turn-Off Time ICC Falls to 10% of Nominal 150 ns –3dBBWVOCM VOCM Pin Small Signal –3dB BW 0.1VP-P at VOCM, Measured Single-Ended at 15 MHz Output (Note 6) IMD3 3rd Order Intermodulation Distortion f = 100MHz (1MHz Spacing), –76 dBc VOUT = 2VP-P Composite OIP3 3rd Order Output Intercept f = 100MHz (Note 7) 42 dBc IIP3 3rd Order Input Intercept f = 100MHz (ZIN = 50Ω) 22 dBc f = 100MHz (ZIN = 200Ω) 16 dBc HD2 2nd Order Harmonic Distortion f = 100MHz, VOUT = 2VP-P –74 dBc HD3 3rd Order Harmonic Distortion f = 100MHz, VOUT = 2VP-P –78 dBc
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 6:
Measured using Test Circuit B. RL = 87.5Ω on each output. may cause permanent damage to the device. Exposure to any Absolute
Note 7:
Since the LTC6421-20 is a feedback amplifi er with low output Maximum Rating condition for extended periods may affect device impedance, a resistive load is not required when driving an AD converter. reliability and lifetime. Therefore, typical output power is very small. In order to compare the
Note 2:
Input pins (+IN, –IN) are protected by steering diodes to either LTC6421-20 with amplifi ers that require 50Ω output load, the output supply. If the inputs go beyond either supply rail, the input current should voltage swing driving a given RL is converted to OIP3 and P1dB as if it were be limited to less than 10mA. driving a 50Ω load. Using this modifi ed convention, 2VP-P is by defi nition
Note 3:
The LTC6421C and LTC6421I are guaranteed functional over the equal to 10dBm, regardless of actual RL. operating temperature range of –40°C to 85°C.
Note 8:
Channel separation (the inverse of crosstalk) is measured by
Note 4:
The LTC6421C is guaranteed to meet specifi ed performance from driving a signal into one input, while terminating the other input. Channel 0°C to 70°C. It is designed, characterized and expected to meet specifi ed separation is the ratio of the resulting output signal at the driven channel performance from –40°C to 85°C but is not tested or QA sampled at these to the channel that is not driven. temperatures. The LTC6421I is guaranteed to meet specifi ed performance
Note 9:
Not production tested. Guaranteed by design and by correlation to from –40°C to 85°C. production tested parameters.
Note 5:
Input and output baluns used. See Test Circuit A.
Note 10:
The output swing range is at least 2VP-P differential even when sourcing or sinking 20mA. Tested at VOCM = 1.5V. 642120fb 4 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION SELECTOR GUIDE DC ELECTRICAL CHARACTERISTICS AC ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS