Datasheet AD7887 (Analog Devices) - 4
| 制造商 | Analog Devices |
| 描述 | 2.7 V to 5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead MSOP |
| 页数 / 页 | 25 / 4 — Data Sheet. AD7887. SPECIFICATIONS. Table 1. Parameter. A Version1. B … |
| 修订版 | E |
| 文件格式/大小 | PDF / 470 Kb |
| 文件语言 | 英语 |
Data Sheet. AD7887. SPECIFICATIONS. Table 1. Parameter. A Version1. B Version. Unit. Test Conditions/Comments
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Data Sheet AD7887 SPECIFICATIONS
VDD = 2.7 V to 5.25 V, VREF = 2.5 V, external/internal reference unless otherwise noted, fSCLK = 2 MHz, TA = TMIN to TMAX, unless otherwise noted.
Table 1. Parameter A Version1 B Version
1
Unit Test Conditions/Comments
DYNAMIC PERFORMANCE Signal to Noise + Distortion Ratio (SNR)2, 3 71 71 dB typ fIN = 10 kHz sine wave, fSAMPLE = 125 kSPS Total Harmonic Distortion (THD)2 −80 −80 dB typ fIN = 10 kHz sine wave, fSAMPLE = 125 kSPS Peak Harmonic or Spurious Noise2 –80 −80 dB typ fIN = 10 kHz sine wave, fSAMPLE = 125 kSPS Intermodulation Distortion (IMD)2 Second-Order Terms −80 −80 dB typ fa = 9.983 kHz, fb = 10.05 kHz, fSAMPLE = 125 kSPS Third-Order Terms −80 −80 dB typ fa = 9.983 kHz, fb = 10.05 kHz, fSAMPLE = 125 kSPS Channel-to-Channel Isolation2 −80 −80 dB typ fIN = 25 kHz Full-Power Bandwidth 2.5 2.5 MHz typ @ 3 dB DC ACCURACY Any channel Resolution 12 12 Bits Integral Nonlinearity2 ±2 ±1 LSB max Differential Nonlinearity2 ±2 ±1 LSB max Guaranteed no missing codes to 11 bits (A Grade) Offset Error2 ±3 ±3 LSB max VDD = 5 V, dual-channel mode ±4 ±4 LSB max VDD = 3 V, dual-channel mode ±6 ±6 LSB typ Single-channel mode Offset Error Match2 0.5 0.5 LSB max Gain Error2 ±2 ±2 LSB max Dual-channel mode ±1 ±1 LSB max Single-channel mode, external reference ±6 ±6 LSB typ Single-channel mode, internal reference Gain Error Match2 2 2 LSB max ANALOG INPUT Input Voltage Ranges 0 to VREF 0 to VREF V Leakage Current ±5 ±5 μA max Input Capacitance 20 20 pF typ REFERENCE INPUT/OUTPUT REFIN Input Voltage Range 2.5/VDD 2.5/VDD V min/max Functional from 1.2 V Input Impedance 10 10 kΩ typ Very high impedance if internal reference disabled REFOUT Output Voltage 2.45/2.55 2.45/2.55 V min/max REFOUT Temperature Coefficient ±50 ±50 ppm/°C typ LOGIC INPUTS Input High Voltage, VINH 2.4 2.4 V min VDD = 4.75 V to 5.25 V 2.1 2.1 V min VDD = 2.7 V to 3.6 V Input Low Voltage, VINL 0.8 0.8 V max VDD = 2.7 V to 5.25 V Input Current, IIN ±1 ±1 μA max Typically 10 nA, VIN = 0 V or VDD Input Capacitance, C 4 IN 10 10 pF max LOGIC OUTPUTS Output High Voltage, VOH ISOURCE = 200 μA VDD − 0.5 VDD − 0.5 V min VDD = 2.7 V to 5.25 V Output Low Voltage, VOL 0.4 0.4 V max ISINK = 200 μA Floating-State Leakage Current ±1 ±1 μA max Floating-State Output Capacitance5 10 10 pF max Output Coding Straight (Natural) Binary Rev. E | Page 3 of 24 Document Outline Features Applications Functional Block Diagram General Description Product Highlights Table of Contents Revision History Specifications Timing Specifications6F Absolute Maximum Ratings ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Terminology Control Register Theory of Operation Circuit Information Converter Operation ADC Transfer Function Typical Connection Diagram Analog Input On-Chip Reference Power-Down Options Power-Up Times Power vs. Throughput Rate Modes of Operation Mode 1 (PM1 = 0, PM0 = 0) Mode 2 (PM1 = 0, PM0 = 1) Mode 3 (PM1 = 1, PM0 = 0) Mode 4 (PM1 = 1, PM0 = 1) Serial Interface Microprocessor Interfacing AD7887 to TMS320C5x AD7887 to ADSP-21xx AD7887 to DSP56xxx AD7887 to MC68HC11 AD7887 to 8051 AD7887 to PIC16C6x/PIC16C7x Application Hints Grounding and Layout Outline Dimensions Ordering Guide Automotive Products
Data Sheet AD7887 SPECIFICATIONS
VDD = 2.7 V to 5.25 V, VREF = 2.5 V, external/internal reference unless otherwise noted, fSCLK = 2 MHz, TA = TMIN to TMAX, unless otherwise noted.
Table 1. Parameter A Version1 B Version
1
Unit Test Conditions/Comments
DYNAMIC PERFORMANCE Signal to Noise + Distortion Ratio (SNR)2, 3 71 71 dB typ fIN = 10 kHz sine wave, fSAMPLE = 125 kSPS Total Harmonic Distortion (THD)2 −80 −80 dB typ fIN = 10 kHz sine wave, fSAMPLE = 125 kSPS Peak Harmonic or Spurious Noise2 –80 −80 dB typ fIN = 10 kHz sine wave, fSAMPLE = 125 kSPS Intermodulation Distortion (IMD)2 Second-Order Terms −80 −80 dB typ fa = 9.983 kHz, fb = 10.05 kHz, fSAMPLE = 125 kSPS Third-Order Terms −80 −80 dB typ fa = 9.983 kHz, fb = 10.05 kHz, fSAMPLE = 125 kSPS Channel-to-Channel Isolation2 −80 −80 dB typ fIN = 25 kHz Full-Power Bandwidth 2.5 2.5 MHz typ @ 3 dB DC ACCURACY Any channel Resolution 12 12 Bits Integral Nonlinearity2 ±2 ±1 LSB max Differential Nonlinearity2 ±2 ±1 LSB max Guaranteed no missing codes to 11 bits (A Grade) Offset Error2 ±3 ±3 LSB max VDD = 5 V, dual-channel mode ±4 ±4 LSB max VDD = 3 V, dual-channel mode ±6 ±6 LSB typ Single-channel mode Offset Error Match2 0.5 0.5 LSB max Gain Error2 ±2 ±2 LSB max Dual-channel mode ±1 ±1 LSB max Single-channel mode, external reference ±6 ±6 LSB typ Single-channel mode, internal reference Gain Error Match2 2 2 LSB max ANALOG INPUT Input Voltage Ranges 0 to VREF 0 to VREF V Leakage Current ±5 ±5 μA max Input Capacitance 20 20 pF typ REFERENCE INPUT/OUTPUT REFIN Input Voltage Range 2.5/VDD 2.5/VDD V min/max Functional from 1.2 V Input Impedance 10 10 kΩ typ Very high impedance if internal reference disabled REFOUT Output Voltage 2.45/2.55 2.45/2.55 V min/max REFOUT Temperature Coefficient ±50 ±50 ppm/°C typ LOGIC INPUTS Input High Voltage, VINH 2.4 2.4 V min VDD = 4.75 V to 5.25 V 2.1 2.1 V min VDD = 2.7 V to 3.6 V Input Low Voltage, VINL 0.8 0.8 V max VDD = 2.7 V to 5.25 V Input Current, IIN ±1 ±1 μA max Typically 10 nA, VIN = 0 V or VDD Input Capacitance, C 4 IN 10 10 pF max LOGIC OUTPUTS Output High Voltage, VOH ISOURCE = 200 μA VDD − 0.5 VDD − 0.5 V min VDD = 2.7 V to 5.25 V Output Low Voltage, VOL 0.4 0.4 V max ISINK = 200 μA Floating-State Leakage Current ±1 ±1 μA max Floating-State Output Capacitance5 10 10 pF max Output Coding Straight (Natural) Binary Rev. E | Page 3 of 24 Document Outline Features Applications Functional Block Diagram General Description Product Highlights Table of Contents Revision History Specifications Timing Specifications6F Absolute Maximum Ratings ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Terminology Control Register Theory of Operation Circuit Information Converter Operation ADC Transfer Function Typical Connection Diagram Analog Input On-Chip Reference Power-Down Options Power-Up Times Power vs. Throughput Rate Modes of Operation Mode 1 (PM1 = 0, PM0 = 0) Mode 2 (PM1 = 0, PM0 = 1) Mode 3 (PM1 = 1, PM0 = 0) Mode 4 (PM1 = 1, PM0 = 1) Serial Interface Microprocessor Interfacing AD7887 to TMS320C5x AD7887 to ADSP-21xx AD7887 to DSP56xxx AD7887 to MC68HC11 AD7887 to 8051 AD7887 to PIC16C6x/PIC16C7x Application Hints Grounding and Layout Outline Dimensions Ordering Guide Automotive Products