CS5516 ETC, CS5516 Datasheet
CS5516
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CS5516 Summary of contents
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... Hz. The CS5520 achieves 20-bit resolution at word rates Hz. The CS5516 and CS5520 sample at a rate set by the user in the form of either an external CMOS clock or a crystal. On-chip digital filtering provides rejection of all frequencies above 12 Hz for a 4.096 MHz clock. ...
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... Notes: 1. The AIN and VREF pins present a very high input resistance at dc and a minor dynamic load which scales to the master clock frequency. Both source resistance and shunt capacitance are therefore critical in determining the source impedance requirements of the CS5516 and CS5520 at these pins. 2. Applies after system calibration at the temperature of interest. ...
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ANALOG CHARACTERISTICS Parameter* Specified Temperature Range Accuracy Linearity Error Differential Nonlinearity (No Missing Codes) Unipolar Gain Error Bipolar Gain Error Unipolar/Bipolar Gain Drift Unipolar Offset Bipolar Offset Offset Drift Noise (Referred to Input) LSB’s V 0.025 0.26 0.047 0.50 0.095 ...
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... Min Unipolar Bipolar (Note (Note 3) - (Note (Note (Note (Note 1) - CS5516, CS5520 Typ Max Units -40 to +85 C 12.5, 25, 50, 100 mV mV 12.5, 25, 50, 100 165 - dB 200 - 100 - 200 - kHz 5 - MHz 1 sec 100 - ...
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... (Note 7) Normal Operation - Standby Mode - Positive Supplies - Negative Supplies - (Note 8) Unipolar Mode 0.8T Bipolar Mode 0.8T (Note 8) Unipolar Mode -2T Bipolar Mode -2T (Notes 10) Unipolar Mode Bipolar CS5516, CS5520 Typ Max Units 3. 100 100 - ppm/ C 0 2.7 3 ...
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... Symbol XIN V IH All Pins Except XIN V IH XIN V IL All Pins Except XIN V IL (Note 11) V (VD+)-1 out = 1.6mA out CS5516, CS5520 Ratio Units f /128 Hz clk f /256 Hz clk f /81,920 Hz clk f /341,334 Hz clk 6/f s out 5%; VA-, VD- = -5V 5%; Min Typ ...
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... Bipolar Notes: 12. All voltages with respect to ground. 13. The CS5516 and CS5520 can accept input voltages unipolar mode and - bipolar mode where T=VREF/(Gx25 the gain setting at the second gain block. When the inputs exceed these values, the CS5516 and CS5520 will output positive full scale for any input above T, and negative full scale for inputs below AGND in unipolar and -T in bipolar mode ...
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... SID Write Timing (Not to Scale) MSB MSB SOD Read Timing (Not to Scale) MSB SOD Read Timing with (Not to Scale with Continuous SCLK (Not to Scale) CS5516, CS5520 LSB LSB DS74F1 ...
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... SCLK - t 200 1 t 200 2 t 150 150 150 15 CS5516, CS5520 5%; Typ Max Units 4.096 5.0 MHz - 1 1 100 - 2.4 MHz - - ...
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... CS5520 outputs 20-bit words. The CS5516/20 devices can measure either unipolar or bipolar signals. Self-calibration is utilized to maximize performance of the meas- urement system. capabilities of the CS5516/20 helpful to ex- amine some of the error sources in bridge measurement systems ...
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... THEORY OF OPERATION The front page of this data sheet illustrates the block diagram of the CS5516 and CS5520 A/D converter. The device includes an instrumenta- tion amplifier with a fixed gain of 25. This chopper-stabilized instrumentation amplifier is followed by a programmable gain stage with gain settings and 8. The sensitivity of ...
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... The CS5516/20 includes a microcontroller which manages operation of the chip. Included in the microcontroller are eight different registers asso- ciated with the operation of the device. An 8-bit command register is used to interpret instruc- tions received via the serial port. When power is applied, and the device has been reset, the se- rial port is initialized into the command mode ...
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... Calibrate ratiometric offset, AIN 0001 Calibrate gain, AIN 0 Must always be logic Must always be logic 0 0 Must always be logic Normal operation R 1 Reset Filter Table 2. Configuration Register CS5516, CS5520 D17 D16 D15 D14 F0 D16 CC1 ...
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... VREF Non-ratiometric Offset 000000(H) 14 CALIBRATION applied to the After the CS5516/20 is reset, the device is func- tional and can perform measurements without being calibrated. The converter will utilize the initialized values of the calibration registers to calculate output words. The converter uses the two outputs (AIN & ...
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... VREF & AIN Non-ratiometric Offset X X End Calibration Table 3. CS5516/CS5520 Calibration Control formed. The calibration steps should be per- formed in the following sequence. If the user determines that non-ratiometric offset calibra- tion is important, the non-ratiometric offset errors of the VREF and AIN input channels should be calibrated first ...
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... EC and CC0 bits of the configuration register are set to logic 1. The gain calibration of the AIN channel is the final calibration step. After 16 CS5516, CS5520 DRDY falls to signal the completion of this cali- bration step, the EC bit of the configuration register must be set back to logic 0 to terminate the calibration mode ...
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... Programmable Gain Amplifier The programmable gain amplifier inside the CS5516/20 offers gains and 8. This is in addition to the fixed gain of instrumentation amplifier. The gain tracking of the PGA is about one percent between ranges. ...
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... Configuration Register - -23 ). After Reset the MSB=1, all other bits are 0. Table 4. Calibration Registers CS5516, CS5520 -18 -19 -20 - D17 D16 D15 D14 F0 D16 ...
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... Hi-Z state whenever CS is high, or after all 24 output data bits have been clocked out of the port. DS74F1 The CS5516/20 is designed such that it can out- put conversion data words continuously, without issuing a new command word prior to each data read. Under the following circumstances, con- ...
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... SCLKs SID Write SCLKs MSB SOD Read ( Wire SCLKs Clear DRDY SOD Read (3 Wire) Figure 4. Command and Data Word Timing CS5516, CS5520 LSB Data Time 24 SCLKs LSB Data Time 24 SCLKs 81,920 XIN Clock Cycles MSB LSB Data Time ...
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... CS5516/ data mode or command mode, the following initialization procedure can be is- sued to the port to force the CS5516/20 into the command mode. Write 128 or more 1’s to the SID pin. Then issue a single 0 to the SID pin. ...
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... To excite the bridge dynamically requires some type of bridge driver external to the CS5516/CS5520 converter. This driver is driven by a square wave clock. The source of this clock depends upon whether the converter is set for internal excita- tion or for external excitation ...
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... Since the MDVR is used for converting both the AIN and VREF signals at the same time, the ab- solute value of the MDVR and its tempco are not important when the CS5516/20 is used in the ratiometric measurement mode. The voltage ref- erence output, MDVR-, should be decoupled using capacitor which is connected to the MDRV+ supply line ...
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... Digital Filter The CS5516/20 is optimized to operate with clock frequencies of 4.096 MHz or 4.9152 MHz. These result in the filter having a 3dB bandwidth Hz, with output word rates 60Hz ...
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... The output conversion words from both the CS5516 and the CS5520 are 24 bits long. The CS5516 has 16 data bits followed by 8 flag bits (all identical). The CS5520 has 20 data bits fol- lowed by 4 flag bits (all identical). To read the conversion data, including the error flag infor- mation will require at least 17 SCLKs for the CS5516 and at least 21 SCLKs for the CS5520 ...
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... The filter will start a new convolution on the next rising edge of the XIN clock after the 24th SCLK falls. Sleep Mode The CS5516/20 configuration register has an A/S bit which allows the users to put the device in a sleep condition to lower quiescent power. Upon reset the A/S bit device is set to a logic 0 which places the device in the ’ ...
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... VREF+ SCLK 9 16 VREF- DRDY 10 15 BX2 BX1 RST 12 13 CS5516, CS5520 Serial Interface Mode Crystal Out Crystal In Negative Digital Power Positive Digital Power Digital Ground Serial Output Data Serial Input Data Serial Clock Input Data Ready Chip Select Reset 27 ...
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... Positive terminal of the internal differential voltage reference which can be tied to the positive supply (VA+) or ground (AGND). MDRV- - Modulator Differential Voltage Reference, PIN 2. This is the -3.75V modulator differential voltage reference output and can be used to generate an analog reference. Note this is with reference to the MDRV+ pin. 28 CS5516, CS5520 DS74F1 ...
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... Model Number Linearity Error (Max) CS5516-AP CS5516-AS CS5520-BP CS5520-BS DS74F1 Temperature Range 0.003% - +85 C 0.003% - +85 C 0.0015% - +85 C 0.0015% - +85 C CS5516, CS5520 Package 24-pin 0.3" Plastic DIP 24-pin 0.3" SOIC 24-pin 0.3" Plastic DIP 24-pin 0.3" SOIC 29 ...
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... Bipolar Offset The deviation of the mid-scale transition (011...111 to 100...000) from the ideal ( AGND) when in bipolar mode (BP/UP high). Units are in LSBs LSB beyond the code transition to all ones, passing through a point 2 CS5516, CS5520 3 LSB]. Units 2 1 LSB above AGND) when in 2 ...
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... FAX: (512) 445 7581 http://www.crystal.com Description The CDB5516 and CDB5520 provide quick and easy evaluation of the CS5516 and CS5520 bridge transducer A/D converters. Direct connection of the bridge to the evaluation board is provided. The board also contains a microcontroller, with firmware ...
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... Introduction The CDB5516/20 evaluation board provides a means of testing the CS5516 and CS5520 bridge transducer A/D converters. The board is de- signed to be interfaced to a PC-compatible computer via an RS-232 port. Software is sup- plied with the board which provides control of all registers in the CS5516 or the CS5520. ...
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... A bridge driver, composed of a Siliconix TP0610 transistor and a Micrel MIC4428 dual CMOS driver, is provided which allows the BX2 output from the CS5516 or CS5520 to provide either excitation to the bridge. The digital interface pins of the A/D converter connect to the microcontroller, or alternatively, these connections can be cut, or the on-board microcontroller can be removed, and the user’ ...
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... Figure 3 illustrates the power supply connections to the evaluation board. Voltages of +5 and -5 analog and +5 digital are required. Using the Evaluation Board Prior to using the board to evaluate the CS5516 or CS5520 A/D converter, a good understanding of the full potential of the converter is necessary recommended that the CS5516/CS5520 de- vice data sheet be thoroughly read prior to attemp ting the ev aluation board ...
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... A/D converter operates in ratiometric measure- ment mode. Figures 4 and 5 illustrate how to connect 4-wire and 6-wire bridge transducers to the board. Alternatively, the CS5516 or CS5520 can be configured for absolute measurement if a preci- sion reference voltage is supplied between the VREF+ and VREF- pins of the A/D converter. ...
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... It may be desirable to also remove R5, R7, C16, and C17 in some applications. Calibrating the A/D Converter As explained in the CS5516/CS5520 data sheet, the order in which the calibration steps are per- formed are important. If one chooses to use the non-ratiometric calibration capabilities of the ...
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Figure 7 illustrates the software supplied with the CDB5516/CDB5520 evaluation board. The software allows the user to manipulate the regis- ters of the converter and perform calibrations and conversions. It decodes the status of the con- figuration register and indicates ...
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Figure 8. CDB5520 Silkscreen CDB5516/CDB5520 DS74DB3 ...
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DS74DB3 Figure 9. CDB5520 Top Ground Plane CDB5516/CDB5520 39 ...
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Figure 10. CDB5520 Solder Side Trace Layer CDB5516/CDB5520 DS74DB3 ...
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Notes • ...
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