Datasheet AD7440, AD7450A (Analog Devices) - 5

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Data Sheet AD7440/AD7450A AD7450A– SPECIFICATIONS Table 2. VDD = 2.7 V to 3.6 V, fSCLK = 18 MHz, fS = 1 MSPS, VREF = 2.0 V; VDD = 4.75 V to 5.25 V, fSCLK = 18 MHz, fS = 1 MSPS, V 1 REF = 2.5 V; VCM = VREF; TA = TMIN to TMAX, unless otherwise noted. Temperature range for B Version: –40°C to +85°C. Parameter Test Conditions/Comments B Version Unit
DYNAMIC PERFORMANCE f = 100 kHz IN Signal-to-(Noise + Distortion) (SINAD)2 70 dB min Total Harmonic Distortion (THD)2 V = 4.75 V to 5.25 V, –86 dB typ –76 dB max DD V = 2.7 V to 3.6 V, –84 dB typ –74 dB max DD Peak Harmonic or Spurious Noise2 V = 4.75 V to 5.25 V, –86 dB typ –76 dB max DD V = 2.7 V to 3.6 V, –84 dB typ –74 dB max DD Intermodulation Distortion (IMD)2 fa = 90 kHz, fb = 110 kHz Second-Order Terms –89 dB typ Third-Order Terms –89 dB typ Aperture Delay2 5 ns typ Aperture Jitter2 50 ps typ Full Power Bandwidth2, 3 @ –3 dB 20 MHz typ @ –0.1 dB 2.5 MHz typ DC ACCURACY Resolution 12 Bits Integral Nonlinearity (INL)2 ±1 LSB max Differential Nonlinearity (DNL)2 Guaranteed no missed codes to 12 bits ±0.95 LSB max Zero-Code Error2 ±6 LSB max Positive Gain Error2 ±2 LSB max Negative Gain Error2 ±2 LSB max ANALOG INPUT Full-Scale Input Span 2 × V 4 V – V V REF IN+ IN– Absolute Input Voltage V V = V V ± V /2 V IN+ CM REF CM REF V V = V V ± V /2 V IN– CM REF CM REF DC Leakage Current ±1 µA max Input Capacitance When in track-and-hold 30/10 pF typ REFERENCE INPUT V Input Voltage V = 4.75 V to 5.25 V 2.55 V REF DD (±1% tolerance for specified performance) V = 2.7 V to 3.6 V 2.06 V DD (±1% tolerance for specified performance) DC Leakage Current ±1 µA max V Input Capacitance When in track-and-hold 10/30 pF typ REF LOGIC INPUTS Input High Voltage, V 2.4 V min INH Input Low Voltage, V 0.8 V max INL Input Current, I Typically 10 nA, V = 0 V or V ±1 µA max IN IN DD Input Capacitance, C 7 10 pF max IN LOGIC OUTPUTS Output High Voltage, V V = 4.75 V to 5.25 V; I = 200 µA 2.8 V min OH DD SOURCE V = 2.7 V to 3.6 V; I = 200 µA 2.4 V min DD SOURCE Output Low Voltage, V I = 200 µA 0.4 V max OL SINK Floating-State Leakage Current ±1 µA max Floating-State Output Capacitance7 10 pF max Output Coding Twos complement Rev. D | Page 5 of 27 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY AD7440–SPECIFICATIONS AD7450A–SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TERMINOLOGY AD7440/AD7450A–TYPICAL PERFORMANCE CHARACTERISTICS CIRCUIT INFORMATION CONVERTER OPERATION ADC TRANSFER FUNCTION TYPICAL CONNECTION DIAGRAM ANALOG INPUT Analog Input Structure DRIVING DIFFERENTIAL INPUTS Differential Amplifier Op Amp Pair RF Transformer DIGITAL INPUTS REFERENCE Example 1 Example 2 SINGLE-ENDED OPERATION SERIAL INTERFACE Timing Example 1 Timing Example 2 MODES OF OPERATION NORMAL MODE POWER-DOWN MODE POWER-UP TIME POWER vs. THROUGHPUT RATE GROUNDING AND LAYOUT HINTS EVALUATING THE AD7440/AD7450A PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE