Datasheet AD7927 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | 8-Channel, 200 kSPS, 12-Bit ADC with Sequencer in 20-Lead TSSOP |
| Pages / Page | 29 / 4 — Data Sheet. AD7927. SPECIFICATIONS. Table 1. Parameter B. Version1 Unit. … |
| Revision | D |
| File Format / Size | PDF / 490 Kb |
| Document Language | English |
Data Sheet. AD7927. SPECIFICATIONS. Table 1. Parameter B. Version1 Unit. Test. Conditions/Comments
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Data Sheet AD7927 SPECIFICATIONS
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 70 dB min @ 5 V, B models 69.5 dB min @ 5 V, W models 69 dB min @ 3 V Typically 70 dB Signal-to-Noise Ratio (SNR)2 70 dB min B models 69.5 dB min W models Total Harmonic Distortion (THD) 2 −77 dB max @ 5 V Typically −84 dB −73 dB max @ 3 V Typically −77 dB Peak Harmonic or Spurious Noise −78 dB max @ 5 V Typically −86 dB (SFDR) 2 −76 dB max @ 3 V Typically −80 dB 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 −82 dB typ fIN = 400 kHz Full Power Bandwidth 8.2 MHz typ @ 3 dB 1.6 MHz typ @ 0.1 dB DC ACCURACY2 Resolution 12 Bits Integral Nonlinearity ±1 LSB max Differential Nonlinearity −0.9/+1.5 LSB max Guaranteed no missed codes to 12 bits 0 V to REFIN Input Range Straight binary output coding Offset Error ±8 LSB max Typically ±0.5 LSB Offset Error Match ±0.5 LSB max Gain Error ±1.5 LSB max Gain Error Match ±0.5 LSB max 0 V to 2 × REFIN Input Range −REFIN to +REFIN biased about REFIN with Positive Gain Error ±1.5 LSB max Twos complement output coding Positive Gain Error Match ±0.5 LSB max Zero Code Error ±8 LSB max Typically ±0.8 LSB Zero Code Error Match ±0.5 LSB max Negative Gain Error ±1 LSB max Negative Gain Error Match ±0.5 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 fSAMPLE = 200 kSPS REFERENCE INPUT REFIN Input Voltage 2.5 V ±1% specified performance DC Leakage Current ±1 μA max REFIN Input Impedance 36 kΩ typ 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. D | Page 3 of 28 Document Outline Features General Description Functional Block Diagram Product Highlights Revision History Specifications Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Terminology Typical Performance Characteristics 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 The Reference Modes of Operation Normal Mode (PM1 = PM0 = 1) Full Shutdown (PM1 = 1, PM0 = 0) Auto Shutdown (PM1 = 0, PM0 = 1) Powering Up the AD7927 Power vs. Throughput Rate Serial Interface Writing Between Conversions Microprocessor Interfacing AD7927 to TMS320C541 AD7927 to ADSP-21xx AD7927 to DSP563xx Application Hints Grounding and Layout Outline Dimensions Ordering Guide Automotive Products
Data Sheet AD7927 SPECIFICATIONS
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 70 dB min @ 5 V, B models 69.5 dB min @ 5 V, W models 69 dB min @ 3 V Typically 70 dB Signal-to-Noise Ratio (SNR)2 70 dB min B models 69.5 dB min W models Total Harmonic Distortion (THD) 2 −77 dB max @ 5 V Typically −84 dB −73 dB max @ 3 V Typically −77 dB Peak Harmonic or Spurious Noise −78 dB max @ 5 V Typically −86 dB (SFDR) 2 −76 dB max @ 3 V Typically −80 dB 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 −82 dB typ fIN = 400 kHz Full Power Bandwidth 8.2 MHz typ @ 3 dB 1.6 MHz typ @ 0.1 dB DC ACCURACY2 Resolution 12 Bits Integral Nonlinearity ±1 LSB max Differential Nonlinearity −0.9/+1.5 LSB max Guaranteed no missed codes to 12 bits 0 V to REFIN Input Range Straight binary output coding Offset Error ±8 LSB max Typically ±0.5 LSB Offset Error Match ±0.5 LSB max Gain Error ±1.5 LSB max Gain Error Match ±0.5 LSB max 0 V to 2 × REFIN Input Range −REFIN to +REFIN biased about REFIN with Positive Gain Error ±1.5 LSB max Twos complement output coding Positive Gain Error Match ±0.5 LSB max Zero Code Error ±8 LSB max Typically ±0.8 LSB Zero Code Error Match ±0.5 LSB max Negative Gain Error ±1 LSB max Negative Gain Error Match ±0.5 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 fSAMPLE = 200 kSPS REFERENCE INPUT REFIN Input Voltage 2.5 V ±1% specified performance DC Leakage Current ±1 μA max REFIN Input Impedance 36 kΩ typ 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. D | Page 3 of 28 Document Outline Features General Description Functional Block Diagram Product Highlights Revision History Specifications Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Terminology Typical Performance Characteristics 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 The Reference Modes of Operation Normal Mode (PM1 = PM0 = 1) Full Shutdown (PM1 = 1, PM0 = 0) Auto Shutdown (PM1 = 0, PM0 = 1) Powering Up the AD7927 Power vs. Throughput Rate Serial Interface Writing Between Conversions Microprocessor Interfacing AD7927 to TMS320C541 AD7927 to ADSP-21xx AD7927 to DSP563xx Application Hints Grounding and Layout Outline Dimensions Ordering Guide Automotive Products
