Datasheet AD7890 (Analog Devices) - 4

AD7890 SPECIFICATIONS
VDD = 5 V, AGND = DGND = 0 V, REF IN = 2.5 V, fCLK IN = 2.5 MHz external, MUX OUT connect to SHA IN. All specifications TMIN to TMAX, unless otherwise noted.
Table 1. Parameter A Versions1 B Versions S Version Unit Test Conditions/Comments
DYNAMIC PERFORMANCE Using external CONVST, any channel Signal to (Noise + Distortion) Ratio2 70 70 70 dB min fIN = 10 kHz sine wave, fSAMPLE = 100 kHz3 Total Harmonic Distortion (THD)2 −77 −77 −77 dB max fIN = 10 kHz sine wave, fSAMPLE = 100 kHz3 Peak Harmonic or Spurious Noise2 −78 −78 −78 dB max fIN = 10 kHz sine wave, fSAMPLE = 100 kHz3 Intermodulation Distortion fa = 9 kHz, fb = 9.5 kHz, fSAMPLE = 100 kHz3 2nd Order Terms −80 −80 −80 dB typ 3rd Order Terms −80 −80 −80 dB typ Channel-to-Channel Isolation2 −80 −80 −80 dB max fIN = 1 kHz sine wave DC ACCURACY Resolution 12 12 12 Bits Min. Resolution for Which No 12 12 12 Bits Missing Codes Are Guaranteed Relative Accuracy2 ±1 ±0.5 ±1 LSB max Differential Nonlinearity2 ±1 ±1 ±1 LSB max Positive Full-Scale Error2 ±2.5 ±2.5 ±2.5 LSB max Full-Scale Error Match4 2 2 2 LSB max AD7890-2, AD7890-4 Unipolar Offset Error2 ±2 ±2 ±2 LSB max Unipolar Offset Error Match 2 2 2 LSB max AD7890-10 Only Negative Full-Scale Error2 ±2 ±2 ±2 LSB max Bipolar Zero Error2 ±5 ±5 ±5 LSB max Bipolar Zero Error Match 2 2 2 LSB max ANALOG INPUTS AD7890-10 Input Voltage Range ±10 ±10 ±10 Volts Input Resistance 20 20 20 kΩ min AD7890-4 Input Voltage Range 0 to 4.096 0 to 4.096 0 to 4.096 Volts Input Resistance 11 11 11 kΩ min AD7890-2 Input Voltage Range 0 to 2.5 0 to 2.5 0 to 2.5 Volts Input Current 50 50 200 nA max MUX OUT OUTPUT Output Voltage Range 0 to 2.5 0 to 2.5 0 to 2.5 Volts Output Resistance AD7890-10, AD7890-4 3/5 3/5 3/5 kΩ min/kΩ max AD7890-2 2 2 2 kΩ max Assuming VIN is driven from low impedance SHA IN INPUT Input Voltage Range 0 to 2.5 0 to 2.5 0 to 2.5 Volts Input Current ±50 ±50 ±50 nA max REFERENCE OUTPUT/INPUT REF IN Input Voltage Range 2.375/2.625 2.375/2.625 2.375/2.625 V min/V max 2.5 V ± 5% Input Impedance 1.6 1.6 1.6 kΩ min Resistor connected to internal reference node Input Capacitance5 10 10 10 pF max REF OUT Output Voltage 2.5 2.5 2.5 V nom REF OUT Error @ 25°C ±10 ±10 ±10 mV max TMIN to TMAX ±20 ±20 ±25 mV max REF OUT Temperature Coefficient 25 25 25 ppm/°C typ REF OUT Output Impedance 2 2 2 kΩ nom Rev. C | Page 3 of 28 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TERMINOLOGY CONTROL REGISTER THEORY OF OPERATION CONVERTER DETAILS CIRCUIT DESCRIPTION AD7890-10 Analog Input AD7890-4 Analog Input AD7890-2 Analog Input TRACK/HOLD AMPLIFIER REFERENCE TIMING AND CONTROL CEXT FUNCTIONING SERIAL INTERFACE SELF-CLOCKING MODE Write Operation EXTERNAL CLOCKING MODE Read Operation Write Operation SIMPLIFYING THE INTERFACE MICROPROCESSOR/MICROCONTROLLER INTERFACE AD7890 TO 8051 INTERFACE AD7890 TO 68HC11 INTERFACE AD7890 TO ADSP-2101 INTERFACE AD7890 TO DSP56000 INTERFACE AD7890 TO TMS320C25/30 INTERFACE ANTIALIASING FILTER PERFORMANCE LINEARITY NOISE DYNAMIC PERFORMANCE EFFECTIVE NUMBER OF BITS OUTLINE DIMENSIONS ORDERING GUIDE