Datasheet AD7908, AD7918, AD7928 (Analog Devices) - 3

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Data Sheet AD7908/AD7918/AD7928 SPECIFICATIONS AD7908 S PECIFICATIONS
AVDD = VDRIVE = 2.7 V to 5.25 V, REFIN = 2.5 V, fSCLK = 20 MHz, TA = TMIN to TMAX, unless otherwise noted.
Table 1. Parameter B Version1 Unit Test Conditions/Comments
DYNAMIC PERFORMANCE fIN = 50 kHz sine wave, fSCLK = 20 MHz Signal-to-(Noise + Distortion) (SINAD)2 49 dB min B models 48.5 dB min W models Signal-to-Noise Ratio (SNR)2 49 dB min B models 48.5 dB min W models Total Harmonic Distortion (THD)2 −66 dB max Peak Harmonic or Spurious Noise (SFDR)2 −64 dB max Intermodulation Distortion (IMD)2 fa = 40.1 kHz, fb = 41.5 kHz Second-Order Terms −90 dB typ Third-Order Terms −90 dB typ Aperture Delay 10 ns typ Aperture Jitter 50 ps typ Channel-to-Channel Isolation2 −85 dB typ fIN = 400 kHz Full Power Bandwidth 8.2 MHz typ @ 3 dB 1.6 MHz typ @ 0.1 dB DC ACCURACY2 Resolution 8 Bits Integral Nonlinearity ±0.2 LSB max Differential Nonlinearity ±0.2 LSB max Guaranteed no missed codes to 8 bits 0 V to REFIN Input Range Straight binary output coding Offset Error ±0.5 LSB max Offset Error Match ±0.05 LSB max Gain Error ±0.2 LSB max Gain Error Match ±0.05 LSB max 0 V to 2 × REFIN Input Range −REFIN to +REFIN biased about REFIN with twos complement output coding Positive Gain Error ±0.2 LSB max Positive Gain Error Match ±0.05 LSB max Zero Code Error ±0.5 LSB max Zero Code Error Match ±0.1 LSB max Negative Gain Error ±0.2 LSB max Negative Gain Error Match ±0.05 LSB max ANALOG INPUT Input Voltage Ranges 0 to REFIN V RANGE bit set to 1 0 to 2 × REFIN V RANGE bit set to 0, AVDD/VDRIVE = 4.75 V to 5.25 V DC Leakage Current ±1 μA max Input Capacitance 20 pF typ REFERENCE INPUT REFIN Input Voltage 2.5 V ±1% specified performance DC Leakage Current ±1 μA max REFIN Input Impedance 36 kΩ typ fSAMPLE = 1 MSPS LOGIC INPUTS Input High Voltage, VINH 0.7 × VDRIVE V min Input Low Voltage, VINL 0.3 × VDRIVE V max Input Current, IIN ±1 μA max Typically 10 nA, VIN = 0 V or VDRIVE Input Capacitance, C 3 IN 10 pF max Rev. E | Page 3 of 28 Document Outline Features General Description Functional Block Diagram Product Highlights Revision History Specifications AD7908 Specifications AD7918 Specifications AD7928 Specifications Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Terminology Typical Performance Characteristics Performance Curves Control Register Sequencer Operation SHADOW Register Circuit Information Converter Operation Analog Input ADC Transfer Function Handling Bipolar Input Signals Typical Connection Diagram Analog Input Selection Digital Inputs VDRIVE Reference Modes of Operation Normal Mode (PM1 = PM0 = 1) Full Shutdown Mode (PM1 = 1, PM0 = 0) Auto Shutdown Mode (PM1 = 0, PM0 = 1) Powering Up the AD7908/AD7918/AD7928 Power vs. Throughput Rate Serial Interface Microprocessor Interfacing AD7908/AD7918/AD7928 to TMS320C541 AD7908/AD7918/AD7928 to ADSP-21xx AD7908/AD7918/AD7928 to DSP563xx Application Hints Grounding and Layout Evaluating the AD7908/AD7918/AD7928 Performance Outline Dimensions Ordering Guide Automotive Products