UM031 FMC168/4/2
r1.7
UM031
page 6 of 28
2 General description
The FMC168 is an eight channel ADC FMC daughter card. The card provides eight 16-bit
250MSPS ADC channels which can be clocked by an internal clock source (optionally locked
to an external reference) or an externally supplied sample clock. There is one trigger input for
customized sampling control. The FMC168 daughter card is mechanically and electrically
compliant to FMC standard (ANSI/VITA 57.1). The FMC168 has a high-pin count connector,
front panel I/O, and can be used in a conduction-cooled environment. A four channel variant,
the FMC164, and a two channel variant, the FMC162, are available and offer the same
features with fewer channels.
The design is based on TI’s ADS42LB69 dual-channel 16-bit 250MSPS ADC with
programmable DDR LVDS or QDR LVDS outputs. The analog signal input can be either AC-
coupled or DC-coupled connecting to SSMC coax connectors on the front panel. In addition,
the FMC164 and FMC162 offer optional differential inputs.
The FMC168/4/2 allows flexible control of sampling frequency and analog input gain through
the I
2
C communication bus. Furthermore the card is equipped with power supply and
temperature monitoring and offers several power-down modes to switch off unused
functions.
Reference Clock
or
Sample Clock
Trigger
ADC A
ADS42LB69
16-bit, 250 MSPS
FMC Connector
HPC
400
Pins
(LPC compatible
)
Clock Tree
Clock
Status & Control
Clock [2x1 pair]
Clock
Output
ADC H
………
.
………
.
………
.
………
.
Monitoring
OPTIONAL
EEPROM
I2C
BOARD
CONTROL
CPLD
Data [8x4 pair]
Clock [2x1 pair] *
Data [8x4 pair] *
* HPC connections
Figure 1: FMC168 block diagram
Note1
: Although the FMC168/4/2 is equipped with a HPC connector, it can be used in LPC
carrier hardware. The LVDS interface on LPC runs at 500MHz DDR for 250Msps sampling
rate. On HPC carriers the LVDS interface can be reduced to 250MHz DDR for 250Msps
sampling.
Note2:
Over-range
bit and
frame signals are not available when targeting the LPC connector
only.
