Sundance SMT942 - Manual (Page 10)

User Manual SMT942 Last Edited: 23/08/2011 17:25:00
3 Functional Description
3.1 Block Diagram
SLB Base Module (In this case SMT351T) SMT942 (SLB Mezzanine Module)
Virtex-5
XC5VLX50T, SX50T, SX95T, LX110T
FF1136 Package
Channel A
Signal
Conditioning
(AC-coupling)
Channel B
Signal
Conditioning
(AC-coupling)
DAC Output
Ch A MMCX
50-Ohm
DAC Output
Ch B MMCX
50-Ohm
Daughter Card
interface
connector
SLB
RSLA
ADC ChannelA and
ChannelB
RSLB
DAC ChannelA and
ChannelB
Top and Bottom TIM
Connectors
ChA Data (16)
and Control
Data and Clocks
4xComports (0,1,3 and 4)
DAC5688
Dual Channel DAC
16-bit 800MSPS
Interpolation
(1.3W)
Channel C
Signal
Conditioning
(AC-coupling)
Channel D
Signal
Conditioning
(AC-coupling)
DAC Output
Ch C MMCX
50-Ohm
DAC Output
Ch D MMCX
50-Ohm
DAC5688
Dual Channel DAC
16-bit 800MSPS
Interpolation
(1.3W)
Power
Daughter Card
connector
SLB
ChD Data (16)
and Control
ChC Data (16)
and Control
Bank A
2.5V
Bank B
2.5V
Bank C
2.5V
Power
Supplies: 1.8
and 3.3 Volts
(Linear
Regulators)
Power
Supplies: 1.0,
1.2, 1.8, 2.5
and 3.3 Volts
External Trigger
Clock Synchronizer
and Jitter Cleaner
based on
CDCE72010
(1.8W)
DACs External Clock In
- MMCX
External Reference
Clock In - MMCX
FPGA Clock
ChB Data (16) and
Control
DACs External Clock
Out - MMCX
Data and Clocks
Figure 1 - SMT942 Block diagram.
3.2 Module Description
The SMT943 has got 2 dual channel DACs (
DAC5688 – Texas Instrument) that have
integrated 2x-8x interpolation filters, a fine frequency mixer with a 32-bit complex
numerically controlled oscillator, an on-board clock multiplier, an IQ compensation
and an internal voltage reference.
A clock distribution chip ensures that all converters sample synchronously to a
single clock source. The clock source can be external or internal (on-board 245.76-
MHz VCXO). The distribution chip also allows synchronising the on-board VCXO to a
reference signal that can be external or internal (on-board 10-MHz crystal). External
reference, external sampling clock input and output are accessible on MMCX
connectors. An external trigger input is also available on the board.
All control, data and clock lines are mapped onto an SLB connector so the card can
be fully controlled by an SLB FPGA base module (SMT351T for example).
Some green LEDs are available on the board. A group of four LEDs is driven directly
from the SLB base FPGA module and can be used to return status bits. Other
indivudual LEDs should be lit and show that local power supplies are on.