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ADS5421 Arkusz danych(PDF) 3 Page - Texas Instruments |
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ADS5421 Arkusz danych(HTML) 3 Page - Texas Instruments |
3 / 26 page ADS5421 3 SBAS237E www.ti.com DIGITAL INPUTS Clock Input Rising Edge of Convert Clock +0.5 +VSD VPP Logic Family (other than clock inputs) +3V/+5V Compatible CMOS High Level Input Current(5) (VIN = 5V) 100 µA Low Level Input Current (VIN = 0V) 10 µA High Level Input Voltage +2.0 V Low Level Input Voltage +1.0 V Input Capacitance 5pF DIGITAL OUTPUTS(6) Logic Family +3V/+5V Compatible CMOS Logic Coding Straight Offset Binary Low Output Voltage (IOL = 50µA to 0.5mA) VDRV = 3V +0.2 V High Output Voltage (IOH = 50µA to 0.5mA) +2.5 V Low Output Voltage (IOL = 50µA to 1.6mA) VDRV = 5V +0.2 V High Output Voltage (IOH = 50µA to 1.6mA) +2.5 V 3-State Enable Time OE = LOW 20 40 ns 3-State Disable Time OE = HIGH 2 10 ns Output Capacitance 5pF ACCURACY Zero Error (Referred to –FS) at +25 °C ±0.5 ±1.0 %FS Zero Error Drift (Referred to –FS) 15 ppm/ °C Gain Error(7) at +25 °C ±0.2 ±1.0 %FS Gain Error Drift(7) 35 ppm/ °C Power-Supply Rejection of Gain ∆V S = ±5% 68 dB Internal REF Tolerance (VREFT, VREFB) Deviation from Ideal ±10 ±50 mV External REF Voltage Range (VREFT – VREFB) 1.4 2 2.025 V Reference Input Resistance 1.0 k Ω POWER-SUPPLY REQUIREMENTS Supply Voltage: +VSA, +VSD Operating, fIN = 10MHz +4.75 +5.0 +5.25 V Supply Current: +IS Operating, fIN = 10MHz 170 mA Output Driver Supply Current (VDRV) 12 mA Power Dissipation: VDRV = 5V 900 mW VDRV = 3V 850 925 mW Power Down Operating 40 mW Thermal Resistance, θ JA LQFP-64 48 °C/W NOTES: (1) Spurious-Free Dynamic Range refers to the magnitude of the largest harmonic. (2) dBFS means dB relative to Full-Scale. (3) 2-tone intermodulation distortion is referred to the largest fundamental tone. This number will be 6dB higher if it is referred to the magnitude of the 2-tone fundamental envelope. (4) Effective Number of Bits (ENOB) is defined by (SINAD – 1.76)/6.02. (5) A 50k Ω pull-down resistor is inserted internally. (6) Recommended maximum capacitance loading, 15pF. (7) Includes internal reference. ELECTRICAL CHARACTERISTICS (Cont.) TA = specified temperature range, typical at +25°C, +VSA = +VSD = +5V, differential input range = 1.5V to 3.5V each input (4VPP), sampling rate = 40MHz, internal reference, VDRV = +3V, and –1dBFS, unless otherwise noted. ADS5421Y PARAMETER CONDITIONS MIN TYP MAX UNITS |
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