AD7609BSTZ Analog Devices Inc, AD7609BSTZ Datasheet
AD7609BSTZ
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AD7609BSTZ Summary of contents
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FEATURES 8 simultaneously sampled inputs True differential inputs True bipolar analog input ranges: ±10 V, ±5 V Single 5 V analog supply and 2 5. Fully integrated data acquisition solution Analog input clamp protection Input buffer ...
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AD7609 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Companion Products ....................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 General Description ......................................................................... 3 Specifications..................................................................................... 4 Timing Specifications .................................................................. 7 Absolute Maximum Ratings.......................................................... 11 Thermal Resistance .................................................................... 11 ...
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GENERAL DESCRIPTION The AD7609 is an 18-bit, 8-channel, true differential, simultaneous sampling analog-to-digital data acquisition system (DAS). The part contains analog input clamp protection, a second-order antialiasing filter, a track-and-hold amplifier, an 18-bit charge redistribution successive approximation analog- to-digital converter ...
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AD7609 SPECIFICATIONS V = 2.5 V external/internal 4. 5. REF CC 1 noted. Table 2. Parameter DYNAMIC PERFORMANCE 2, 3 Signal-to-Noise Ratio (SNR) Signal-to-(Noise + Distortion) (SINAD) Dynamic Range 2, 3 Total Harmonic Distortion ...
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Parameter ANALOG INPUT Differential Input Voltage Ranges Absolute Voltage Input Common-Mode Input Range CMRR Analog Input Current 7 Input Capacitance Input Impedance REFERENCE INPUT/OUTPUT Reference Input Voltage Range DC Leakage Current 7 Input Capacitance Reference Output Voltage Reference Temperature Coefficient ...
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AD7609 Parameter Power Dissipation Normal Mode (Static) 8 Normal Mode (Operational) Standby Mode Shutdown Mode 1 Temperature range for B version is −40°C to +85°C. 2 See the Terminology section. 3 This specification applies when reading during a conversion or ...
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TIMING SPECIFICATIONS DRIVE 1 unless otherwise noted. Table 3. Limit at T Parameter Min PARALLEL/SERIAL/BYTE MODE t CYCLE t CONV 3.45 7.87 16.05 33 ...
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AD7609 Limit at T Parameter Min SERIAL READ OPERATION f SCLK 0 SCLK t 0 SCLK t ...
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Limit at T Parameter Min Sample tested during initial release to ensure compliance. All input signals are specified with t 2 The delay between the CONVST x signals was measured as the maximum ...
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AD7609 CS, RD DATA: DB[15:0] [17:2] FRSTDATA CS SCLK OUT D B OUT FRSTDATA [1:0] [17:2] [1:0] [17:2] Figure 5. CS and RD Linked Parallel Mode t ...
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ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 4. Parameter AV to AGND AGND DRIVE 1 Analog Input Voltage to AGND Digital Input Voltage to AGND Digital Output Voltage to AGND REFIN to AGND ...
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AD7609 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS ANALOG INPUT DECOUPLING CAPACITOR PIN POWER SUPPLY GROUND PIN DATA OUTPUT DIGITAL OUTPUT DIGITAL INPUT REFERENCE INPUT/OUTPUT Table 6. Pin Function Descriptions 1 Pin No. Type Mnemonic Description 1, 37, 38 ...
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Pin No. Type Mnemonic Description 8 DI RANGE Analog Input Range Selection. Logic input. The polarity on this pin determines the input range of the analog input channels. If this pin is tied to a logic high, the analog ...
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AD7609 1 Pin No. Type Mnemonic Description [2:0] Oversampling Mode Pins. Logic inputs. These inputs are used to select the oversampling ratio the MSB control bit, and the LSB ...
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TYPICAL PERFORMANCE CHARACTERISTICS 0 AV INTERNAL REFERENCE –20 ±10V RANGE f SAMPLE – 16384 POINT FFT –60 SNR = 91.52dB THD = –111.05dB –80 –100 –120 –140 –160 0 20k 40k 60k INPUT FREQUENCY (Hz) Figure 8. FFT ...
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AD7609 1.0 0.8 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1.0 CODE Figure 14. Typical DNL, ±5 V Range –20 –40 200kSPS –60 AV EXTERNAL REFERENCE –80 –40 –25 – TEMPERATURE ...
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AV f CHANGES WITH OS RATE SAMPLE 100 INTERNAL REFERENCE × × × × × × 100 10k INPUT FREQUENCY ...
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AD7609 110 105 ±10V RANGE 100 ±5V RANGE DRIVE 25°C A INTERNAL REFERENCE f SCALES WITH OS RATIO SAMPLE × × ...
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TERMINOLOGY Integral Nonlinearity The maximum deviation from a straight line passing through the endpoints of the ADC transfer function. The endpoints of the transfer function are zero scale, a ½ LSB below the first code transition, and full scale at ...
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AD7609 Power Supply Rejection (PSR) Variations in power supply affect the full-scale transition but not the converter’s linearity. Power supply rejection is the maximum change in full-scale transition point due to a change in power supply voltage from the nominal ...
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THEORY OF OPERATION CONVERTER DETAILS The AD7609 is a data acquisition system that employs a high speed, low power, charge redistribution successive approxima- tion analog-to-digital converter (ADC) and allows the simultaneous sampling of eight true differential analog input channels. The ...
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AD7609 Analog Input Antialiasing Filter An analog antialiasing filter is also provided on the AD7609. The filter is a second-order Butterworth. Figure 35 and Figure 36 show the frequency and phase response respectively of the analog antialiasing filter. In the ...
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INTERNAL/EXTERNAL REFERENCE The AD7609 contains an on-chip 2.5 V band gap reference. The REFIN/REFOUT pin allows access to the 2.5 V reference that generates the on-chip 4.5 V reference internally allows an external reference of 2 ...
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AD7609 TYPICAL CONNECTION DIAGRAM Figure 41 shows the typical connection diagram for the AD7609. There are four AV supply pins on the part that CC can be tied together and decoupled using a 100 nF capacitor at each supply pin ...
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CONVERSION CONTROL Simultaneous Sampling on All Analog Input Channels The AD7609 allows simultaneous sampling of all analog input channels. All channels are sampled simultaneously when both CONVST x pins (CONVST A, CONVST B) are tied together. A single CONVST x ...
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AD7609 DIGITAL INTERFACE The AD7609 provides two interface options: a parallel interface and a high speed serial interface. The required interface mode is selected via the PAR /SER SEL pin. The operation of the interface modes is described in the ...
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Figure 6 shows the timing diagram for reading one channel of data, framed by the CS signal, from the The SCLK input signal provides the clock source for the serial CS goes low to access the data from the AD7609. ...
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AD7609 DIGITAL FILTER The AD7609 contains an optional digital filter. This digital filter is a first-order sinc filter. This digital filter should be used in applications where slower throughput rates are used or where higher signal-to-noise ratio or dynamic range ...
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CONVST A, CONVST BUSY CS RD DATA: DB[15:0] Figure 46. AD7609—No Oversampling, Oversampling × 4, and Oversampling × 8 Using Read After Conversion 1600 NO OVERSAMPLING 1384 1373 1400 1167 1200 1062 1000 840 800 727 ...
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AD7609 4500 OVERSAMPLING BY 16 3833 4000 3500 3279 3000 2500 2000 1500 1000 406 500 3 0 –3 –2 –1 0 CODE Figure 51. Histogram of Codes—OS × 16 (Six Codes) 6000 OVERSAMPLING BY 32 5090 5000 4000 3000 ...
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FREQUENCY (Hz) Figure 56. Digital Filter Response for OS × –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 100 1k 10k ...
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AD7609 LAYOUT GUIDELINES The printed circuit board that houses the designed so that the analog and digital sections are separated and confined to different areas of the board. Use at least one ground plane. It can be common or split ...
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To ensure good device-to-device performance matching in a system that contains multiple AD7609 devices, a symmetrical layout between the AD7609 devices is important. Figure 62 shows a layout with two AD7609 devices. The AV plane runs to the right of ...
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... OUTLINE DIMENSIONS 1.45 1.40 1.35 SEATING PLANE VIEW A ROTATED 90° CCW ORDERING GUIDE 1 Model Temperature Range AD7609BSTZ −40°C to +85°C AD7609BSTZ-RL −40°C to +85°C EVAL-AD7609EDZ −40°C to +85°C CED1Z RoHS Compliant Part. 12.20 12.00 SQ 0.75 11.80 0.60 1.60 MAX ...
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NOTES Rev Page AD7609 ...
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AD7609 NOTES ©2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D09760-0-7/11(0) Rev Page ...