PXDAC4800 - 1.2 GSPS, 14-bit or 8-bit, 4-Channel, Arbitrary Waveform Generator PCIe x8 DAC Board with Analog Devices AD9736 DAC

The PXDAC4800 is an exceptionally high-speed four channel Digital to Analog Conversion (DAC) board which may be used as an Arbitrary Waveform Generator, a waveform playback device, or for generating multiple communication frequency bands. Each DAC can output data at a maximum real rate of 1.2 GSPS at 14-bit for two channels or at 8-bit for four channels, or 600 MSPS at 14-bit for four channels. Each output signal has a bandwidth of up to 400 MHz for AC-Coupled configuration or up to 590 MHz for DC-Coupled configuration. Output waveforms may be "per-trigger" or "continuously looped" from the on-board 1 Gigabyte memory.

The DACs can also be provided with a continuous data stream via the PCI Express (PCIe) bus up to 900 Megabytes per second (MB/s). This PCIe bus rate allows for providing up to 112.5 MSPS addressable bandwidth at full 14-bit resolution for each of the four analog outputs.

The DAC clock source may be selected as either the 1200 MHz or 900 MHz VCO oscillator or from the external clock input. The PXDAC4800 has two clock dividers. Clock divider #1 must be an integer between 1 and 32. Clock divider #2 must be an integer between 1 and 6. The clock dividers operate in series so that there are 98 unique division combinations for a maximum division of 192. These dividers are also available with an external clock.

The VCO oscillators have extremely low jitter and can be synchronized to an external reference input or to the internal TCXO reference. The internal reference is accurate to better than 3ppm.

Fixed frequency oscillators have been chosen instead of a wide-band frequency synthesizer based on providing an SNR benefit of approximately 10 dB when producing very high frequency output signals.

The PXDAC4800 is a nice complement to Signatec's PX14400 and PX1500-4 waveform acquisition boards and is ideal for playing back extremely long waveforms, such as those previously captured with a Signatec Waveform Recording system. This is particularly useful in testing a system's response to previously recorded real world signals. In such an operation the data is supplied from the high-speed data storage system via the PCI Express bus and the PXDAC4800's on-board RAM is utilized as a very large FIFO data buffer.

Product Specifications

Product: PXDAC4800 Full Data Sheet
Update: Revision 2.1 - 04/05/2016
File Size: 1.45 MB

Signal Connections
     DAC Channel 1: Output
     DAC Channel 2: Output
     DAC Channel 3: Output
     DAC Channel 4: Output
     Clock: Input
     Trigger: Input
     Digital I/O: Input/Output
     SMA: 7
Analog Outputs for PXDAC4800A
     Voltage: 470mV to 1450mV p-p
     Impedance: designed for 50 ohm source
     Low Bandwidth (-3dB): <2 MHz (tested at 1.2 GSPS)
     High Bandwidth (-3dB): >400 MHz (tested at 1.2 GSPS)
     Coupling: AC
Analog Outputs for PXDAC4800D
     Voltage: 400mV to 1470mV p-p
     Impedance: designed for 50 ohm source
     High Bandwidth (-3dB): >590 MHz (tested at 1.2 GSPS)
     Coupling: DC
Analog Performance
     SNR: AC: 65 dB @ 10 MHz
AC: 61 dB @ 70 MHz
DC: 62 dB @ 10 MHz
DC: 60 dB @ 70 MHz

     THD: AC: -69 dB @ 10 MHz
AC: -67 dB @ 70 MHz
DC: -65 dB @ 10 MHz
DC: -51 dB @ 70 MHz

     SINAD: AC: 64 dB @ 10 MHz
AC: 60 dB @ 70 MHz
DC: 61 dB @ 10 MHz
DC: 51 dB @ 70 MHz

     SFDR: AC: 73 dB @ 10 MHz
AC: 70 dB @ 70 MHz
DC: 68 dB @ 10 MHz
DC: 51 dB @ 70 MHz

     ENOB+: AC: 10.2 bits @ 10 MHz
AC: 9.7 bits @ 70 MHz
DC: 9.8 bits @ 10 MHz
DC: 8.2 bits @ 70 MHz

     Notes: Test done at 90% of DAC full scale, analog mid-range, 14-bit and 1.2GHz. ENOB+ is based on SINAD. Typical results.
External Trigger 
     Trigger Level: TTL, CMOS or LVPECL, 3.5V max.
     Trigger Input: 2V comparator with 50mV hysteresis
     Coupling: DC
External Clock
     Signal Type: sine or square wave
     Impedance: 50 ohms to ground
     Frequency: 50 MHz to 1200 MHz
     Amplitude: 500 mV p-p to 2.0V p-p
     Coupling: AC
Reference Clock - External
     Signal Type: sine or square wave
     Impedance: 50 ohms to ground
     Frequency: 10.0 MHz ± 200 ppm max.
     Amplitude: 100 mV p-p to 2.0V p-p
     Coupling: AC
Reference Clock - Internal
     Frequency: 10.0 MHz ± 3 ppm max.
Trigger Modes
     Per-Trigger: single start trigger runs memory data once every trigger

     Continuous: single start trigger runs looped memory data or continuous stream from PCIe bus

     Single shot: single start trigger runs memory data once
     Trigger Re-Arm Time: 16 Clock Cycles
DAC Memory
     DDR2 SDRAM: 1 GB
Maximum Data Rates
     Input Data Rate to each DAC: 1.2 GSPS

     DAC Output Rate: 1.2 GSPS @ 14-bit for 2 Channels
600 MSPS @ 14-bit for 4 Channels
1.2 GSPS @ 8-bit for 4 Channels

     DAC Rise Time: 800 picoseconds, typical

     Jitter Between DAC Outputs: better than 200 picoseconds

     PCIe Bus: up to 900 MB/s;
the maximum speed depends on the PCIe slot type, hard drive / RAID speed, PC internal architecture and chipset
Power Requirements
     +3.3V: 1.95 Amps max.
     +12V: 1.27 Amps max.
Absolute Maximum Ratings
     Trigger Input: -0.3 to +3.5 volts
     Digital I/O: -0.3 to +3.5 volts
     Clock Input: 5 volts peak to peak
     Operating Temperature: +32 to +122 °F / 0 to +50 °C
     Storage Temperature: -4 to +158 °F / -20 to +70 °C
     Operating Relative Humidity: 10% to 90%, non-condensing
     Board Dimensions: 6.6” L x 4.4” H x 0.75” W /
16.8cm L x 11.1cm H x 1.9cm W
Computer Requirements
     I/O Interface: PCIe x8 Slot
     System RAM: 2 GB for Board Operation
8 GB for PCIe Streaming Operation
     Operating System: Windows 7
(64-bit or 32-bit OS for Board Operation)
(64-bit OS for PCIe Streaming Operation)