6-Bit, 1 MSPS, 8-Channel Data Acquisition System ADAS3022 Data Sheet FEATURES and buffer; and a 16-bit charge redistribution analog-to-digital converter (ADC) with successive approximation register (SAR) architecture. The ADAS3022 can resolve eight single-ended inputs or four fully differential inputs up to ±24.576 V when using ±15 V supplies.
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ADAS3022 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Typical Application Connection Diagram .............................. 24 Applications ....................................................................................... 1 Analog Inputs.............................................................................. 25 General Description .......................................................................
Data Sheet ADAS3022 SPECIFICATIONS VDDH = 15 V ± 5%, VSSH = −15 V ± 5%, AVDD = DVDD = 5 V ± 5%, VIO = 1.8 V to AVDD, internal reference, VREF = 4.096 V, fS = 1 MSPS. All specifications TMIN to TMAX, unless otherwise noted. Table 2.
ADAS3022 Parameter Offset Error Temperature Drift Total Unadjusted Error AC ACCURACY 3 Signal-to-Noise Ratio (SNR) Signal-to-Noise-and-Distortion (SINAD) Dynamic Range Total Harmonic Distortion Spurious-Free Dynamic Range Channel-to-Channel Crosstalk Common-Mode Rejection Ratio (CMRR) −3 dB Input Bandwidth AUXILIARY ADC INPUT CHANNEL DC Accuracy Integral Nonlinearity Error Differential Nonlinearity Error Gain Error Offset Error Data Sheet Test Conditions/Comments External reference PGIA gain = 0.
Data Sheet Parameter AC Performance Signal-to-Noise Ratio (SNR) Signal-to-Noise-and-Distortion (SINAD) Total Harmonic Distortion Spurious-Free Dynamic Range (SFDR) INTERNAL REFERENCE REFx Output Voltage REFx Output Current REFx Temperature Drift REFx Line Regulation Internal Reference Buffer Only REFIN Output Voltage 4 Turn-On Settling Time EXTERNAL REFERENCE Voltage Range Current Drain TEMPERATURE SENSOR Output Voltage Temperature Sensitivity DIGITAL INPUTS Logic Levels VIL VIH VIL VIH IIL IIH DIGITAL OUTP
ADAS3022 Parameter IVSSH IAVDD IDVDD IVIO Power Supply Sensitivity At TA = 25°C TEMPERATURE RANGE Specified Performance Data Sheet Test Conditions/Comments PGIA gain = 0.16 PGIA gain = 0.2 PGIA gain = 0.4 PGIA gain = 0.8 PGIA gain = 1.6 PGIA gain = 3.2 PGIA gain = 6.4 All PGIA gains, PD = 1 PGIA gain = 6.4, reference buffer enabled All other PGIA gains, reference buffer enabled PGIA gain = 6.
Data Sheet ADAS3022 TIMING SPECIFICATIONS VDDH = 15 V ± 5%, VSSH = −15 V ± 5%, AVDD = DVDD = 5 V ± 5%, VIO = 1.8 V to AVDD, internal reference, VREF = 4.096 V, fS = 1 MSPS. All specifications TMIN to TMAX, unless otherwise noted. Table 3.
ADAS3022 Data Sheet tACQ tCYC EOC SOC SOC EOC POWER UP CONVERSION (n – 1) UNDEFINED PHASE ACQUISITION (n) UNDEFINED tDDC tQUIET tDAC NOTE 1 NOTE 2 NOTE 1 ACQUISITION (n + 1) UNDEFINED CONVERSION (n) UNDEFINED CONVERSION (n + 1) UNDEFINED CNV BUSY tDDCA NOTE 5 NOTE 2 tAD NOTE 4 CS X 1 16/32 NOTE 3 SCK 1 16 DIN CFG INVALID CFG (n + 2) CFG (n + 2) CFG (n + 3) SDO DATA INVALID DATA (n – 1) INVALID DATA (n – 1) INVALID DATA (n) INVALID EOC EOC ACQUISITION (n + 2) PHASE
Data Sheet ADAS3022 ABSOLUTE MAXIMUM RATINGS Table 4. Parameter Analog Inputs/Outputs INx, COM to AGND AUX+, AUX− to AGND REFx to AGND REFIN to AGND REFN to AGND Ground Voltage Differences AGND, RGND, DGND Supply Voltages VDDH to AGND VSSH to AGND AVDD, DVDD, VIO to AGND ACAP, DCAP, RCAP to GND Digital Inputs/Outputs CNV, DIN, SCK, RESET, PD, CS to DGND SDO, BUSY to DGND Internal Power Dissipation Junction Temperature Storage Temperature Range θJA Thermal Impedance θJC Thermal Impedance Rating VSSH − 0.
ADAS3022 Data Sheet 40 39 38 37 36 35 34 33 32 31 AUX– VDDH VSSH REFN REFN RGND REF2 REF1 REFIN RCAP PIN CONFIGURATION AND FUNCTION DESCRIPTIONS PIN 1 INDICATOR ADAS3022 TOP VIEW (Not to Scale) 30 29 28 27 26 25 24 23 22 21 NC NC AVDD DVDD ACAP DCAP AGND AGND DGND DGND NOTES 1. NC = NO CONNECT. THIS PIN IS NOT INTERNALLY CONNECTED. 2. THE EXPOSED PADDLE SHOULD BE CONNECTED TO VSSH.
Data Sheet ADAS3022 Pin No. 27 28 31 Mnemonic DVDD AVDD RCAP Type 1 P P P 32 REFIN AI/O 33, 34 REF1, REF2 AI/O 35 36, 37 RGND REFN P P 38 VSSH P 39 VDDH P 40 AUX− EPAD AI Description Digital 5 V Supply. Decouple this supply using a 10 μF capacitor and a 0.1 μF local capacitor. Analog 5 V Supply. Decouple this supply using a 10 μF capacitor and a 0.1 μF local capacitor. Internal 2.5 V Analog Regulator Output. This regulator supplies power to the internal reference.
ADAS3022 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS VDDH = 15 V, VSSH = −15 V, AVDD = DVDD = 5 V, VIO = 1.8 V to AVDD, unless otherwise noted. 2.0 1.00 GAIN = 0.16, 0.2, 0.4, 0.8, 1.6 INL MAX = 0.649 INL MIN = –0.592 FOR ALL GAINS 0.75 0.50 0.5 0.25 0 –0.5 –0.25 –1.0 –0.50 –1.5 –0.75 –2.0 0 8192 16384 24576 32768 40960 49152 57344 65536 CODE –1.00 0 8192 16384 24576 32768 40960 49152 57344 65536 CODE Figure 6. Integral Nonlinearity vs. Code, PGIA Gain = 0.16, 0.2, 0.4, 0.
Data Sheet ADAS3022 400,000 100 EXTERNAL REFERENCE GAIN = 6.4 fS = 1000kSPS GAIN = 6.4 90 350,000 80 300,000 70 COUNT 200,000 157,300 151,900 150,000 60 50 40 30 82,000 75,100 20 50,000 21,700 0 10516-120 8009 0 8008 8007 8006 8005 8004 8003 8002 8000 8001 7FFF 7FFE 7FFD 7FFC 10 18,400 2,400 100 200 300 0 CODE IN HEX 0.4 0.8 1.2 1.6 2.4 2.0 2.8 3.2 3.6 4.0 OFFSET DRIFT (ppm/°C) 10516-157 100,000 Figure 15. Offset Drift, PGIA Gain = 6.4 Figure 12.
ADAS3022 Data Sheet 0 GAIN = 0.16 fS = 1000kSPS fIN = 10.1kHz SNR = 91.7dB SINAD = 89.2dB THD = –92.5dB SFDR = 92.5dB –60 –40 –80 –100 –120 –60 –80 –100 –120 –140 –140 –160 –160 –180 0 100 200 300 400 500 FREQUENCY (kHz) –180 10516-121 0 300 400 500 Figure 21. 10 kHz FFT, PGIA Gain = 0.8 0 GAIN = 0.2 fS = 1000kSPS fIN = 10.1kHz SNR = 91.4dB SINAD = 89.9dB THD = –94.7dB SFDR = 94.
Data Sheet ADAS3022 0 –55 GAIN = 6.4 fS = 1000kSPS fIN = 10.1kHz SNR = 85.7dB SINAD = 85.6dB THD = –101dB SFDR = 103dB –20 –60 –65 –70 –75 –80 THD (dB) AMPLITUDE (dBFS) –40 GAIN = 0.4, GAIN = 0.8, GAIN = 1.6, GAIN = 3.2, GAIN = 0.4, GAIN = 0.8, GAIN = 1.6, GAIN = 3.2, –60 –80 –100 –0.5dBFS –0.5dBFS –0.5dBFS –0.
ADAS3022 Data Sheet 20 PSRR VSSH AVDD, GAIN = 1.6 AVDD, GAIN = 6.4 PSRR VDDH AVDD, GAIN = 0.2 AVDD, GAIN = 3.2 –55 GAIN = 0.2 GAIN = 1.6 AVDD CURRENT (mA) –65 –70 –75 –80 –85 GAIN = 0.8 GAIN = 6.4 16 14 12 –90 0.1 1 10 100 10 FREQUENCY (kHz) 10 100 1000 THROUGHPUT (kSPS) 10516-134 –95 –100 0.01 Figure 33. AVDD Current vs. Throughput, Internal Reference Figure 30. PSRR vs. Frequency 15 19 GAIN = 0.2 GAIN = 1.6 GAIN = 0.8 GAIN = 6.4 GAIN = 0.4 GAIN = 3.2 GAIN = 0.2 GAIN = 1.
Data Sheet ADAS3022 0 18 GAIN = 0.2 GAIN = 1.6 GAIN = 0.4 GAIN = 3.2 fS = 1000kSPS GAIN = 0.8 GAIN = 6.4 –2 –4 VSSH CURRENT (mA) 12 9 6 –6 –8 –10 –12 –14 –16 –18 10 100 1000 THROUGHPUT (kSPS) –20 –50 –40 –30 –20 –10 10516-137 0 10 20 30 40 50 GAIN = 0.8 GAIN = 6.4 60 70 80 90 Figure 39. VSSH Current vs. Temperature 19.5 0 fS = 1000kSPS GAIN = 0.2 GAIN = 1.6 GAIN = 0.4 GAIN = 3.2 GAIN = 0.8 GAIN = 6.4 19.0 AVDD CURRENT (mA) –3 –6 –9 –12 –15 –18 10 18.0 17.5 17.
ADAS3022 Data Sheet 5 4.00 fS = 1000kSPS GAIN = 0.2 GAIN = 1.6 GAIN = 0.4 GAIN = 3.2 GAIN = 0.8 GAIN = 6.4 4 3.75 3 GAIN ERROR (LSB) VIO CURRENT (mA) 3.50 3.25 3.00 2.75 2 GAIN = 0.16 GAIN = 0.2 GAIN = 0.4 GAIN = 0.8 GAIN = 1.6 GAIN = 3.2 GAIN = 6.4 fS = 1000kSPS EXTERNAL REFERENCE 1 0 –1 –2 2.50 –3 2.25 0 10 20 30 40 50 60 70 80 90 TEMPERATURE (°C) –5 –50 –40 –30 –20 –10 10516-145 2.00 –50 –40 –30 –20 –10 50 60 70 80 90 70 80 90 Figure 45. Gain Error vs.
Data Sheet ADAS3022 5200 5000 4800 4600 4400 4200 4000 3800 3400 –50 –40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90 TEMPERATURE (°C) 10516-152 3600 Figure 48. Temperature Sensor Output Code vs. Temperature –0.5 –1.0 –1.5 –2.0 –2.5 –3.0 –0.5dBFS –3.5 –4.5 10 GAIN = 0.4 GAIN = 1.6 GAIN = 6.4 100 1k FREQUENCY (Hz) 10k 10516-153 NORMALIZED CLOSED-LOOP GAIN (dB) 0 GAIN = 0.2 GAIN = 0.8 GAIN = 3.
ADAS3022 Data Sheet TERMINOLOGY Operating Input Voltage Range Operating input voltage range is the maximum input voltage range, including the common-mode voltage, allowed on the input channels IN[7:0] and COM. Differential Nonlinearity (DNL) Error In an ideal ADC, code transitions are 1 LSB apart. DNL is the maximum deviation from this ideal value. It is often specified in terms of resolution for which no missing codes are guaranteed.
Data Sheet ADAS3022 Total Harmonic Distortion (THD) THD is the ratio of the rms sum of the first five harmonic components to the rms value of a full-scale input signal and is expressed in decibels. Spurious-Free Dynamic Range (SFDR) SFDR is the difference, expressed in decibels, between the rms amplitude of the input signal and the peak spurious signal. Channel-to-Channel Crosstalk Channel-to-channel crosstalk is a measure of the level of crosstalk between any channel and all other channels.
ADAS3022 Data Sheet THEORY OF OPERATION the ADAS3022 solution include reduced footprint and less complex design requirements, which also results in faster time to market and lower cost. OVERVIEW The ADAS3022 is the first system on a single chip that integrates the typical components used in a data acquisition system in one easy to use, programmable device. This single-chip solution is capable of converting up to 1,000,000 samples per second (1 MSPS) of aggregate throughput.
Data Sheet ADAS3022 When the sequencer option is used, an on-chip sequencer scans channels in order and offers independent input voltage ranges for each channel (see the Channel Sequencer Details section). In this mode, a single configuration word initiates the sequencer to scan repeatedly without the need to rewrite the register.
ADAS3022 Data Sheet TYPICAL APPLICATION CONNECTION DIAGRAM Table 6. Output Codes and Ideal Input Voltages Description FSR − 1 LSB Midscale + 1 LSB Midscale Midscale − 1 LSB −FSR + 1 LSB −FSR Differential Analog Inputs, VREF = 4.
Data Sheet ADAS3022 ANALOG INPUTS Input Structure The ADAS3022 uses a differential input structure between IN[7:0] and COM or between IN[7:0]+ and IN[7:0]− of a channel pair. The COM input is sampled identically such that the same voltages can be present on inputs IN[7:0]. Therefore, the selection of paired channels or all channels referenced to one common point is available.
ADAS3022 Data Sheet for single-ended signals, if possible, is to remove as much dc offset as possible between INx+ and INx− to produce a bipolar input voltage that is symmetric around the ground sense. In this example, the differential voltage across the inputs is never greater than ±0.64 V, and the PGIA gain configuration is set to 101 for the 1.28 V p-p range. This scenario uses all of the codes available for the transfer function, making full use of the allowable differential input range.
Data Sheet ADAS3022 IN0+ IN0 IN0+ IN0 IN1+ IN1 IN1+ IN1 IN2+ IN2 IN2+ IN2 IN3+ IN3 IN3+ IN3 IN4+ IN4 IN4+ IN4 IN5+ IN5 IN5+ IN5 IN6+ IN6 IN6+ IN6 IN7+ IN7 IN7+ IN7 COM– A—8 CHANNELS, SINGLE-ENDED B—8 CHANNELS, COMMON REFERENCE IN0 IN0+ (–) IN0 IN0– (+) IN1 IN0– (+) IN1 IN1+ (–) IN2 IN1+ (–) IN2 IN1– (+) IN3 IN1– (+) IN3 IN2+ (–) IN4 IN2+ IN4 IN2– (+) IN5 IN3+ IN5 IN3+ (–) IN6 IN4+ IN6 IN3– (+) IN7 IN5+ IN7 C—4 CHANNELS, DIFFERENTIAL • COM
ADAS3022 Data Sheet The ADAS3022 allows the choice of an internal reference or an external reference using the on-chip buffer/amplifier, or an external reference. The internal reference of the ADAS3022 provides excellent performance and can be used in almost all applications. To set the reference selection mode, use the internal reference enable bit (REFEN) and the REFIN pin as described in this section. REF1 and REF2 must be tied together externally. the main system reference. With REFIN = 2.
Data Sheet ADAS3022 Reference Decoupling POWER SUPPLY With any of the reference topologies described in the Voltage Reference Input/Output section, the REF1 and REF2 reference pins of the ADAS3022 have dynamic impedances and require sufficient decoupling, regardless of whether the pins are used as inputs or outputs. This decoupling usually consists of a low ESR capacitor connected to each REF1 and REF2 and to the accompanying REFN return paths.
ADAS3022 Data Sheet High Voltage Supplies The high voltage bipolar supplies (VDDH and VSSH) are required and must be at least 2.5 V larger than the maximum input. For example, the supplies should be ±15 V for headroom in the ±24.576 V differential input range. Sufficient decoupling of these supplies is also required, consisting of at least a 10 μF capacitor and a 100 nF capacitor on each supply. Power Dissipation Modes be allowed the specified settling time.
Data Sheet ADAS3022 DIGITAL INTERFACE BUSY Falling Edge—End of a Conversion (EOC) This interface uses the three asynchronous signals (CNV, RESET, and PD) and a 4-wire serial interface composed of CS, SDO, SCK, and DIN. CS can also be tied to CNV for some applications. Conversion results are available on the serial data output pin (SDO), and the 16-bit configuration word (CFG) is programmed on the serial data input pin (DIN).
ADAS3022 Data Sheet RESET AND POWER-DOWN (PD) INPUTS Note that in Figure 67 and Figure 68, SCK is shown idling high. SCK can idle high or low, requiring that the system developer design an interface that suits setup and hold times for both SDO and DIN. A rising edge on RESET or PD aborts the conversion process and places SDO into high impedance, regardless of the CS level. Note that RESET has a minimum pulse width (active high) time for setting the ADAS3022 into the reset state.
Data Sheet ADAS3022 SOC Sampling on the SCK Rising Edge (Alternate Edge) tAD SPI or other alternate edge transfers typically require more time to access data because the total data transfer time of these slower hosts can be >tDDC. If this is the case, the time from tQUIET to the next CNV rising edge, which is known as the data access time after conversion (tDAC) and is determined by the user, must be adjusted by lowering the throughput rate (CNV frequency), thus providing the necessary time.
ADAS3022 Data Sheet SOC EOC tDDCA SOC tAD GENERAL TIMING tDDC tDAC Figure 72 is a general timing diagram showing the complete register to conversion and readback pipeline delay. The figure details the timing upon power-up or upon returning from a full power-down by use of the PD input.
Data Sheet ADAS3022 SOC EOC tAD tQUIET CNV n BUSY n+2 n+1 n n+1 n+2 CS n+2 DIN 1 n+1 n n+3 16 n+4 16 1 1 10516-252 n–1 SDO 16 SCK Figure 73. General Timing Diagram of AUX Input Channel Pair (RDC) SOC EOC tEN tAD tQUIET CNV n+2 n+1 n BUSY n+1 n n+3 n+2 n+3 CS n+3 DIN 1 n+2 n+1 n+5 n+4 16 1 16 SCK Figure 74. General Timing Diagram of AUX Input Channel Pair (RAC) Rev.
ADAS3022 Data Sheet conversions are required for the user-specified CFG setting to take effect. Therefore, the default value is CFG[15:0] = 0x8FCF. This sets the ADAS3022 as follows: CONFIGURATION REGISTER The configuration register, CFG, is a 16-bit, programmable register for selecting all of the ADAS3022 user-programmable options (see Table 11). The register is loaded when data is read back for the first 16 SCK rising edges and is updated at the next EOC.
Data Sheet Bits [5:4] Bit Name SEQ 3 TEMPB 2 REFEN 1 CMS 0 CPHA ADAS3022 Description Channel sequencer. Allows for scanning channels sequentially from IN0 to INx. INx is the last channel converted prior to resetting the sequence back to IN0 and is specified by the channel selected in the INx[2:0] configuration bits (see the Channel Sequencer Details section).
ADAS3022 Data Sheet INx and COM Inputs with AUX Inputs (MUX = 0, TEMPB = 1) Update During Sequence (SEQ = 01) To use individual INx channels with reference to COM or pairs of INx channels with the AUX inputs in a sequence, the MUX bit must be set to 0 to append the AUX channel to the end of the sequence (after the channel set in INx is scanned). Note that the AUX input is a pair, whereas the INx channel can be referenced to COM or pairs of INx channels.
Data Sheet ADAS3022 OUTLINE DIMENSIONS 0.30 0.25 0.18 31 30 0.50 BSC TOP VIEW 1.00 0.95 0.85 0.45 0.40 0.35 1 21 11 20 PIN 1 INDICATOR *4.70 4.60 SQ 4.50 EXPOSED PAD 0.05 MAX 0.02 NOM COPLANARITY 0.08 0.20 REF SEATING PLANE 40 10 BOTTOM VIEW 0.25 MIN FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET. *COMPLIANT TO JEDEC STANDARDS MO-220-VJJD-5 WITH EXCEPTION TO EXPOSED PAD DIMENSION.
ADAS3022 Data Sheet NOTES ©2012–2013 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D10516-0-4/13(B) Rev.
