L-502 Multifunctional ADC/DAC board with PCIe (PCI express) interface

Multifunctional ADC/DAC board with PCIe (PCI express) interface

ADC: 16 bits / 2 MHz
Input channels: 16 differential or 32 with "common ground"
Blackfin digital signal processor with 32 MB of RAM (optional)
Digital inputs/outputs: 18/16
Synchronous digital input: 2 MHz (18 lines) and 1 MHz synchronous digital output (16 lines)
Synchronization of several L-502 in one system unit
PCI Express x1 rev.1.0
Two-channel DAC 16 bits, 1 MHz per channel (optional)
Galvanic isolation from the computer (optional)

Universal I/O board for analog and digital signals to PC via PCI Express interface with the possibility of their digital processing in real time.

As an option, it is possible to install a two-channel 16-bit DAC with the possibility of synchronous output with a frequency of up to 1 MHz per channel.

ADC channels switching during multichannel data acquisition mode is automatic, with arbitrary channel sampling order, with a given measurement sub-range and averaging factor of ADC samples for each channel.

Installed in L-502-P powerful signal processor Blackfin (ADSP-BF523), running at a sampling rate of 530 MHz with a connected SDRAM 32 MB, allows a low-level programmer to implement his own algorithms that work in real time and are not dependent on the operating system. Almost all Blackfin performance (especially effective at DSP tasks) is given to user processing tasks, since all Blackfin interface transfers are implemented by DMA and Blackfin memory is directly displayed in PC memory. But, at the same time, the lack of Blackfin in the L-502-X does not interfere with the implementation of real-time algorithms using PC.

The high-tech architecture of the L-502 also uses the CPLD of Max II family and FPGA of Cyclone IV family.

The architecture of the L-502 was developed in the new E-502 external module with USB&Ethernet, software compatible with L-502. The same Blackfin software can be used in L-502 and E-502 . The architecture of the L-502 and E-502 at the Blackfin level is identical (there are minor differences, which are described in the E-502 manual).

L-502 high-speed synchronous data I/O has a wide range of applications. For example, based on the L-502, image input systems from CCD sensors with sensor control from L-502 can be built.

Inter-module synchronization of several L-502 boards installed in adjacent PCI Express slots (of any size) inside one computer.

Synchronization cable for L-502

L-502-SYNC

Digital input/output from the rear panel of PC.
Suitable for all ADC/DAC PCI-boards.
Two modifications (male/female) are available.

Digital signals cable

AC-7XX

Compatible with L-780M, L-783M, L-791, L-502 and AC-7XX cables.
Reduces interference at digital lines.
Improves the quality of digital signals transmission.
Easy to mount.

Plug adapter for digital connector
of L-xxx boards

PBD2BH

Fast commutation
of external signals
There are several holes in the board to fix a cable assembly.

37-pin interface terminal block board

DB-37F-increaser

ADC

Number of channels

16 differential or 32 with "common ground"

Resolution

16 bits

Effective resolution (for a sinusoidal signal of 10 kHz / 2 V peak-peak, the conversion frequency is 400 kHz)

15,0 bits (corresponds to SINAD = 92 dB)

Input impedance (at single-channel mode)

Relative to AGND - not less than 20 MOhm
Differential - not less than 40 MOhm

Input signal measuring sub-ranges

±10 V, ±5 V, ±2 V, ±1 V, ±0,5 V, ±0,2 V

Maximum conversion frequency

2 MHz
(1.5 MHz when synchronizing the conversion frequency from another L-502 board)

The main error (referred to the range) of the DC voltage measurement

±0,05 %

Synchronization

Internal
By external synchro-signal
Synchronization of multiple L-502

Inputs protection

±15 V

Common-mode rejection ratio 50 Hz with amplitude 1 V in differential mode (by subbands)

77 dB (±10 V)
83 dB (±5 В)
90 dB (±2 V)
92 dB (± 1 V)
92 dB (± 0,5 V)
92 dB (± 0,2 V)

The intrinsic input noise of ADC at the shorted input, depending on the sub-band of ADC and the averaging factor of the samples (K average) for each channel.

Sampling frequency	К average	ADC sub-range, V
		±10	±5	±2	±1	±0,5	±0,2
		Typical value of noise level, brought to the input of ADC, μV
2 MHz	1	309	157	50	37	22	18
400 kHz	5	127	56	28	16	12	8
50 kHz	20	62	27	13	8	6	4
10 kHz	128	40	25	12	7	5	4

Inter-channel interference, dB

Resistance of the signal source (in the channel in which the interchannel interference is measured)	Channel sampling time, μs (with averaging coefficient equal to 1) or channel setup time, μs
	0,5	1,0	2,0	4,0	8,0	16,0
	Inter-channel interference, dB (the signal from the previous channel in the order of interrogation)
0-50 Ohm	-65	-78	-82	-82	-82	-82

Digital signal processor (option)

Type

Blackfin ADSP-BF523

Sampling rate

530 MHz

RAM

32 MB (SDRAM, 16 bits; 132,5 MHz)

Program interface with ADSP-BF523

Independent, via HOST DMA of ADSP-BF523 processor

The main interface for peripherals (ADC, DAC, digital I/O)

SPORT0, >120 Mbps, duplex

Galvanic isolation (option)

Galvanic isolation boundaries

Between all the circuits that ends to the contacts of the signal connectors and PC circuits. The metal housing of the DRB-37M connector is not galvanically isolated from the PC.

Test voltage of galvanic isolation

500 V for 1 min.

L-502 modifications, in which galvanic isolation is available

L-502-P-G, L-502-P-G-D, L-502-X-G, L-502-X-G-D

DAC (option)

Number of voltage outputs with common ground

Frequency of output in synchronous mode

1 MHz per channel

Output modes

Synchronous (streaming) or asynchronous

Output range

±5 V

Operating range of output currents

0-10 mA

Digital inputs

Total number of digital general-purpose inputs

18 (two of them can be used for synchronization)

Data entry modes

Synchronous, asynchronous

Pull-up resistors to a high logic level

Yes

Maximum speed in synchronous mode

2 MHz

Recommended operating voltage range

0 …+5,5 V

High-impedance state with power off

Yes

Maximum input current with power off

10 μA

Own input current in operating mode with software-activated pull-up resistors

10 μA

The resistance of pull-up resistors

2.2 kOhm relative to +3.3 V (pull-up resistors are programmatically switched-on for groups of inputs)

Digital outputs

Total number of TTL-compatible digital outputs

Control of the third state of outputs

Yes

Data output modes

Synchronous, asynchronous

Maximum speed in synchronous mode

1 Msamples/s

Maximum permissible current in the load circuit

20 mA

Recommended current in the load circuit

Not more than 8 mA

Logical "1" level without load output

+3,3 V

Logical "0" level without load output

0…+0,1 V

Output resistance, typical value

110 Ohm

Maximum leakage current in operating mode in high-impedance state

±1 μA

High-impedance state with power off

Inter-module synchronization

Topology of multimodule connections over synchronization lines

Sequence (inside one PC system unit)

Maximum number of synchronized L-502 modules in sequence synchronization scheme

Equal to the number of PCIe slots in the PC motherboard

Maximum length of inter-module synchronization cable

40 cm (only to the neighboring PCIe slot)

Number of inter-module synchronization lines

2 twisted pairs

Interface to computer

Standard

PCIe x1 rev. 1.0 (the board is compatible with the PCI Express slot of the motherboard of any bandwidth: x1, x2, x4, x8, x12, x16, x32).

Maximum data transfer rate for PCIe

200 MB/s, duplex (physical throughput of the PCIe controller)

Resolution of the L-502 data sample for PCIe

32 bits

DMA support at BUS MASTER mode for PCIe

Yes

Design characteristics

Design

PCI Express CARD x1 standard height, with bracket, less than half length (HALF LENGTH), in accordance with PCI Express Card Electromechanical Specification rev.2.0.
Requires one PCI Express slot.

Overall dimensions of the PCB (length x height)

136 x 101 mm

Environmental conditions

General requirements

L-502 is designed for use in closed premises in accordance with the requirements of National Standart 22261 (group 3) with an extended range of operating temperatures.

Normal conditions

Ambient temperature	(+25±5)°C
Relative humidity	30…80%
Atmosphere pressur	630…800 mm hg. art.

Operating conditions

Ambient temperature	+5… + 55°C
Relative humidity	Up to 90% at +25°C

Storage conditions

Ambient temperature	+0… + 40°C
Relative humidity	Up to 80% at +25°C without condensation
Other	The absence of dust, acid vapors, alkalis, and corrosive gases in the air

Transportation conditions

Ambient temperature	-25… +55°C
Relative humidity	Not more than 95% at the temperature of +25°C
Other	All kinds of transport provided protection against direct atmospheric precipitation

External circuits power supply

Power supply outputs for external analog and digital circuit

+15 V, -15 V, +3,3 V. The maximum currents taken from the outputs are selected by the criterion of not exceeding the maximum load power according to the methodology in Manual.

Maximum power load, taken from all L-502 outputs

For L-502-X-X-D (with DAC)	0,4 W
For L-502-X-X (without DAC)	0,8 W

Signal connectors

Hardware description, assignment and connection of signals is given in the User's Guide.

Notation system

Note on technically possible modifications of L-502: When ordering from 40-50 pcs. it is possible to produce a purely digital modification of L-502 at a reduced price without analog I/O ADC/DAC. On interest in such a modification of L-502, please contact Sales Department.

L-502-X-X

board with no galvanic isolation, no DAC, no processor
L-502-X-X-D

board with DAC, no galvanic isolation, no processor
L-502-X-G

board with galvanic isolation, no DAC, no processor
L-502-X-G-D

board with galvanic isolation, with DAC, no processor
L-502-P-G

board with galvanic isolation, with processor, no DAC
L-502-P-G-D

board with galvanic isolation, with processor, with DAC

L-502-X-X

L-502-X-X-D

L-502-X-G

L-502-X-G-D

L-502-P-G

L-502-P-G-D

Descriptions

l-502_users_guide_en.pdf (filesize: 1 349 400 bytes, date: 27.02.2018)
L-502 PCI-Express board User's Guide.
x502api_en.pdf (filesize: 1 059 110 bytes, date: 16.04.2018)
Programmer's Guide for L502 and E502 modules.

LGraph2 software package

lgraph2.zip (filesize: 26 785 216 bytes, date: 14.09.2021)
LGraph2 is a free multi-channel data recorder for Windows. Version 2.35.16 provides the possibility of simultaneous data visualization and recording from the ADCs: L-502, L-780M, L-783, L-791, E-502, E14-140, E14-140M, E14-440, E-154, E20-10, LTR11, LTR114, LTR27, LTR212, LTR216, LTR22, LTR24, LTR25, LTR51. It requires an updated version of the LComp driver (from version 01.04.2010) and ltrserver (no lower than 1.5.2.1).

Software for Windows

lpcie_setup.exe (filesize: 11 082 072 bytes, date: 01.09.2021)
L-CARD L502/E502 SDK. Version 1.1.20. It includes driver, libraries, files for software development and programming examples for L-CARD L502 and E502 modules for Windows (starting with Windows XP SP3 and higher, including 64-bit versions).
x502studio.zip (filesize: 11 632 368 bytes, date: 03.09.2020)
Demonstration software for E-502 and L-502 modules