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15

Differential and Pseudo-Differential Input Configuration 

The  PCIe-69529  provides  both  differential  and  psuedo-differential  input  configurations, 

with  differential  input  mode  providing  voltage  to  the  anode  and  cathode  inputs  of  the 

SMB connector according to signal voltage difference there between. If the signal source is 

ground-referenced, differential input mode can be used for common-mode noise rejection.
If  the  signal  source  is  a  floating  signal,  pseudo-differential  input  mode  can  provide  a 

reference  ground  connected  to  the  cathode  input  of  the  SMB  through  a  50  Ω  resistor, 

preventing the floating source from drifting over the input common-mode range.
Recommended configurations for the signal sources are as follows.

Signal Source Type

Card Configuration

Floating

Pseudo Differential

Ground-Reference

Differential

AC and DC Input Coupling

AC and DC coupling are available. With DC coupling, DC offset present in the input signal 

is passed to ADC, and is indicated if the signal source has a small level of offset voltage or 

if DC content of the signal is important. In AC coupling, the DC offset present in the input 

signal is erased, and is indicated if the DC content of the input signals is to be rejected. AC 

coupling enables a high pass R-C filter through the input signal path. The corner frequency 

(-3dB) is about 0.5Hz.

Input for IEPE

For applications that require sensors such as accelerometers or microphones, the PCIe-

69529  provides  an  excitation  current  source.  The  common  excitation  current  is  usually 

about 4mA for these IEPE sensors. A DC voltage offset is generated due to the excitation 

current and sensor impedance. When IEPE current sources are enabled, the PCIe-69529 

automatically sets input configuration to AC coupling.

3�2�2    Input Range and Data Format

When using an A/D converter, properties of the signal to be measured should be considered 

prior to selecting channel and signal connection to the module. A/D acquisition is initiated 

by  a  trigger  source,  which  must  be  predetermined.  Data  acquisition  commences  once 

the trigger condition is established. Following completion of A/D conversion, A/D data is 

buffered in a Data FIFO, and can then be transferred to PC memory for further processing. 

Transfer  characteristics  of  the  two  input  ranges  of  the  PCIe-69529  are  as  follows.  Data 

format of the PCIe-69529 is 2’s complement.

Description

Full-scale range

Least significant 

bit

FSR-1LSB

-FSR

Bipolar Analog 
Input

±10 V

1.19 μV

9.99999881 V

-10 V

±1V

0.119 μV

0.999999881V -1 V

Digital Code

N/A

N/A

7FFFFF

800000

Table  3-1: Input Range and Data Format

Содержание PCIe-69529

Страница 1: ...PCIe 69529 8 CH 24 Bit 204 8 kS s Dynamic Signal Acquisition Module User s Manual Manual Rev 1 00 Revision Date Jul 16 2016...

Страница 2: ...ent minor physical injury component damage data loss and or program corruption when trying to complete a task Informationtopreventseriousphysicalinjury componentdamage dataloss and or program corrupti...

Страница 3: ...ions 14 3 1 Functional Block Diagram 14 3 2 Analog Input Channel 14 3 2 1 Analog Input Front End Configuration 14 3 2 2 Input Range and Data Format 15 3 2 3 ADC and Analog Input Filter 16 3 2 4 DMA Da...

Страница 4: ...III...

Страница 5: ...Input Range and Data Format 15 Table 3 2 Input Range Midscale Values 16 Table 3 3 ADC Sample Rates vs DDS Output Clock 16 Table 3 4 Preferred Characteristics for Analog Triggers 20 Table 3 5 Timing R...

Страница 6: ...7 Figure 1 6 PCIe 69529 Side View 9 Figure 1 7 PCIe 69529 I O Array 10 Figure 3 1 Analog Input Architecture 14 Figure 3 2 Linked List of PCI Address DMA Descriptors 17 Figure 3 3 Trigger Architecture...

Страница 7: ...EPE signal conditioning for accelerometers and microphones The PCIe 69529 is auto calibrated with an onboard reference circuit calibrating offset and acquiring analog input errors Following auto calib...

Страница 8: ...ts for 8KS s Fs 54kS s Over voltage protection Differential 42 4V Pseudo differential positive terminal 42 4 V negative terminal unprotected rated at 2 5 V Input impedance 1M 50 between negative input...

Страница 9: ...kS s Fs 108 kS s Fs 192 kS s 1V 10V 104 104 105 1 1 kHz input tone and 1 dBFS input amplitude 2 Measurement Includes harmonics Dynamic Range Dynamic Range dBFS 1 Input Range V Fs 54 kS s Fs 108 kS s F...

Страница 10: ...kS s Fs 108 kS s Fs 192 kS s 1V 103 99 99 10V 105 101 101 1 CCIF 14 kHz 15 kHz 2 6 dBFS input amplitude for each tone Crosstalk Crosstalk dBc 1 2 Input Range V 1 kHz 0 5 Fs 1V 10V 100 97 1 Shorted in...

Страница 11: ...sponse Frequency Hz Magnitude dB Figure 1 1 Analog Input Channel Bandwidth 1dBFS 108kS s 10 1 10 0 10 1 4 5 4 3 5 3 2 5 2 1 5 1 0 5 0 Frequency Hz Magnitude dB Response when AC coupling enabled Figure...

Страница 12: ...V Input Range 1 dBFS and 1 kHz Sine Wave Input Figure 1 3 Spurious Free Dynamic Range 54kS s 0 0 5 1 1 5 2 2 5 3 3 5 4 4 5 5 x 10 4 160 140 120 100 80 60 40 20 0 Frequency Hz Magnitude dB SFDR 108 kS...

Страница 13: ...FDR 192 kS s 1V Input Range 1 dBFS and 1 kHz Sine Wave Input Figure 1 5 Spurious Free Dynamic Range 192kS s 1 3 2 Timebase Sampling Clock Sampling Clock Timebase Internal onboard synthesizer 10 MHz ac...

Страница 14: ...rigger polarity Rising or falling edge Pulse width 20 ns minimum Table 1 3 Digital Trigger Input 1 3 4 General Specifications Physical Physical dimensions 167 64W x 106 68H mm 6 53 x 4 16 in Bus Bus i...

Страница 15: ...9 1 4 Schematics and I O All dimensions are in mm 100 36 59 05 176 42 Figure 1 6 PCIe 69529 Side View...

Страница 16: ...10 The PCIe 69529 I O array is labeled to indicate connectivity as shown Figure 1 7 PCIe 69529 I O Array...

Страница 17: ...ides the following software development kits NET driver for Windows compatible with various application environments such as C VB NET VC NET VB VC BCB and Delphi 1 5 2 DSA DASK DSA DASK includes devic...

Страница 18: ...ewdriver Anti static wrist strap Antistatic mat JYTEK PCIe 69529 DSA modules are electrostatically sensitive and can be easily damaged by static electricity The module must be handled on a grounded an...

Страница 19: ...crew and the bracket cover 4 Line up the PCI express digitizer with the PCI express slot on the backpanel Slowly push down on the top of the PCI express digitizer until its card edge connector is rest...

Страница 20: ...JFET Buffer OPAMP 3 3V 5V 12V FPGA ADC Control Trigger Control Data Processing FIFO Interface PCIe Controller PCIe Gen1 x4 PCIe Gen1 x4 Slot ADC BUS SSI Bus 0 7 SSI_TIMEBASE 3 3V 5V 12V Quad 24bit AD...

Страница 21: ...e input signals is to be rejected AC coupling enables a high pass R C filter through the input signal path The corner frequency 3dB is about 0 5Hz Input for IEPE For applications that require sensors...

Страница 22: ...M to 36 864 MHz Table 3 3 ADC Sample Rates vs DDS Output Clock Filter Each channel has a two pole lowpass filter The filters limit bandwidth of the signal path and reject wideband noise 3 2 4 DMA Data...

Страница 23: ...tor nodes circularly to achieve a multibuffered DMA A linked list comprising three DMA descriptors Each descriptor contains a PCI address PCI dual address a transfer size and the pointer to the next d...

Страница 24: ...ires identification of trigger source The PCIe 69529 supports internal software trigger external digital trigger and SSI Bus Number 5 as well as analog trigger Software Trigger The software trigger ge...

Страница 25: ...69529 analog trigger circuitry can be configured to monitor one analog input channel from which data is acquired Selection of an analog input channel as the analog trigger channel does not influence t...

Страница 26: ...119 V 800001 9 99999881 V 0 999999881 V 800000 10 V 1 V Table 3 4 Preferred Characteristics for Analog Triggers Trigger Export The PCIe 69529 utilizes SSI Bus Number 5 to act as a System Synchronizati...

Страница 27: ...the period of PCIe_CLK X 2 32 1 and minimum is the period of PCIe_CLK 8 ns Time Operation start Trigger Data Trigger Event Occurs Acquisition stop Begin to transfer data to system N samples Acquisiti...

Страница 28: ...quency exceeding the sample rate and produced by a PLL chip with output frequency programmable to superior resolution The PCIe 69529 accepts the external timebase from SSI Bus Number 0 for synchroniza...

Страница 29: ...bling The PCIe 69529 utilizes the SSI Bus 0 7 as a System Synchronization Interface SSI Dedicate routing of timebase clock and trigger signals onto the SSI Bus enables the PCIe 69529 to simplify synch...

Страница 30: ...llows 3 6 1 SSI_TIMEBASE As output the SSI_TIMEBASE signal transmits the onboard ADC timebase through the SSI bus As input the PCIe 69529 accepts the SSI_TIMEBASE signal as the source of the timebase...

Страница 31: ...et to hardware In the absence of user assignment the driver loads constants stored in bank 0 If constants from Bank 1 are to be loaded the preferred bank can be designated as boot bank by software Fol...

Страница 32: ...power source settings Always install and operate equipment near an easily accessible electrical socket outlet Secure the power cord do not place any object on over the power cord Only install attach a...

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