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ADS4449IZCR bảng dữ liệu(PDF) 4 Page - Texas Instruments |
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ADS4449IZCR bảng dữ liệu(HTML) 4 Page - Texas Instruments |
4 / 54 page ADS4449 SBAS603 – APRIL 2013 www.ti.com SPECIAL PERFORMANCE MODES Best performance can be achieved by writing certain modes depending upon source impedance, band of operation and sampling speed. Table 1 summarizes the different these modes. Table 1. High-Performance Modes Summary(1) SPECIAL MODES SUMMARY INPUT FREQUENCIES INPUT FREQUENCIES SPECIAL MODE NAME ADDRESS (Hex) DATA (Hex) (Up to 125 MHz) (> 125 MHz) High-frequency mode F1 20 Not required Must 58 20 Optional Optional 70 20 Optional Optional High SNR mode(2) 88 20 Optional Optional A0 20 Optional Optional (1) See the Serial Interface Registers section for details. (2) High SNR mode improves SNR typically by 1 dB at 170 MHz input frequency. See the Using High SNR Mode Register Settings section. ELECTRICAL CHARACTERISTICS Typical values are at TA = +25°C, full temperature range is TMIN = –40°C to TMAX = +85°C, ADC clock frequency = 250 MHz, 50% clock duty cycle, AVDD33V = 3.3 V, AVDD = 1.9 V, DRVDD = 1.8 V, and –1-dBFS differential input, unless otherwise noted. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS RESOLUTION Default resolution 14 Bits ANALOG INPUTS Differential input full-scale 2 VPP VCM Common mode input voltage 1.15 V RIN Input resistance, differential At 170-MHz input frequency 700 Ω CIN Input capacitance, differential At 170-MHz input frequency 3.3 pF With a 50- Ω source driving the ADC Analog input bandwidth, 3 dB 500 MHz analog inputs DYNAMIC ACCURACY EO Offset error Specified across devices and channels –15 15 mV As a result of internal reference inaccuracy Specified across devices and channels –5 5 %FS EG Gain error(1) alone Of channel alone Specified across channels within a device ±0.2 %FS Channel gain error temperature coefficient(1) 0.001 Δ%/°C POWER SUPPLY(2) IAVDD33 3.3-V analog supply 51 mA IAVDD Supply current 1.9-V analog supply 350 mA IDRVDD 1.8-V digital supply 355 mA PTOTAL Total 1.47 1.6 W PDISS(standby) Power dissipation Standby 400 mW PDISS(global) Global power-down 6 52 mW (1) There are two sources of gain error: internal reference inaccuracy and channel gain error. (2) A 185-MHz, full-scale, sine-wave input signal is applied to all four channels. 4 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Product Folder Links: ADS4449 |
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