Datasheet AD7722 (Analog Devices) - 14

AD7722 1.0 200 0.8 180 AIDD 0.6 160 0.4 140 0.2 120 DIDD 0 100 –0.2 80 POWER (mW) INL ERROR (LSB) –0.4 60 –0.6 40 20 –0.8 0 –1.0 0 20000 40000 65535 0 2.5 5.0 7.5 10.0 12.5 15.0 CODE CLKIN FREQUENCY (MHz)
TPC 10. Integral Nonlinearity Error TPC 13. Power Consumption vs. CLKIN Frequency
0 0 CLKIN = 12.5MHz AIN = 90kHz –20 SNR = 90.1dB –20 XTAL = 12.288MHz SNR = 88.1dB S/(N+D) = 89.2dB –40 –40 S/(N+D) = 88.1dB SFDR = –99.5dB SFDR = –103.7dB –60 THD = –96.6dB –60 2ND = –100.9dB dB –80 3RD = –106.0dB dB –80 4TH = –99.5dB –100 –100 –120 –120 –140 –140 –154 –154 0 10 20 30 40 50 60 70 80 98 0 20 40 60 80 96 FREQUENCY (kHz) FREQUENCY (kHz)
TPC 11. 16K Point FFT TPC 14. 16K Point FFT
0 0 XTAL = 12.288MHz AIN = 90kHz –20 SNR = 89.0dB –20 CLKIN = 12.5 MHz S/(N+D) = 87.8dB SNR = 89.6dB –40 –40 SFDR = –94.3dB S/(N+D) = 89.6dB SFDR = –108.0dB –60 THD = –93.8dB –60 2ND = –94.3dB dB –80 3RD = –108.5dB dB –80 4TH = –105.7dB –100 –100 –120 –120 –140 –140 –154 –154 0 20 40 60 80 96 0 20 40 60 80 98 FREQUENCY (kHz) FREQUENCY (kHz)
TPC 12. 16K Point FFT TPC 15. 16K Point FFT REV. B –13– Document Outline FEATURES FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ORDERING GUIDE TIMING SPECIFICATIONS PIN FUNCTION DESCRIPTIONS PIN CONFIGURATION PARALLEL MODE PIN FUNCTION DESCRIPTIONS SERIAL MODE PIN FUNCTION DESCRIPTIONS TERMINOLOGY Signal-to-Noise Plus Distortion Ratio (S/(N+D)) Total Harmonic Distortion (THD) Spurious-Free Dynamic Range (SFDR) Intermodulation Distortion Pass-Band Ripple Pass-Band Frequency Cutoff Frequency Stop-Band Frequency Stop-Band Attenuation Integral Nonlinearity Differential Nonlinearity Common-Mode Rejection Ratio Unipolar Offset Error Bipolar Offset Error Gain Error Typical Performance Characteristics CIRCUIT DESCRIPTION APPLYING THE AD7722 Analog Input Range Differential Inputs Applying the Reference Input Circuits Clock Generation Varying the Master Clock SYSTEM SYNCHRONIZATION AND CONTROL SYNC Input DVAL Reset Input Power-On Reset Offset and Gain Calibration DATA INTERFACING Parallel Interface SERIAL INTERFACE 2-Channel Multiplexed Operation Serial Interfacing to DSPs OUTLINE DIMENSIONS Revision History