ADC14DS105KARB/NOPB National Semiconductor, ADC14DS105KARB/NOPB Datasheet - Page 11

• Manufacturer Part Number: ADC14DS105KARB/NOPB
• Description: BOARD EVAL FOR ADC14DS105KARB
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of ADC14DS105KARB/NOPB

• Design Resources: ADC14DS105KARB Ref Design
• Number Of Adc's: 2
• Number Of Bits: 14
• Sampling Rate (per Second): 105M
• Data Interface: Serial
• Inputs Per Adc: 1 Differential
• Power (typ) @ Conditions: 1W @ 105MSPS
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: ADC14DS105
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ADC14DS105KARB

5.5 LMK02000 Programming
The LMK02000, which provides the sample clock for
the ADC, must be programmed to correctly configure it
for the proper clock frequency. The programming can
be accomplished by either one of two methods.
The first method is to attach a small PIC-based module
that is included in this evaluation kit. This module is
plugged onto the 10-pin header labeled “UWIRE” as
described in Section 4.4 of this user’s guide. If this
module is used, the JP1 jumper must be installed to
provide power from the main boad to the PIC module.
The PIC module will program the LMK02000 to lock the
100MHz VCXO to a reference of 25 MHz.
The second method for programming the LMK02000
uses the 10-pin “UWIRE” header to connect the
LMK02000’s serial programming interface (DATA,
CLK, LE) to a PC. To use this programming interface,
a special parallel port (LPT) cable supplied by National
Semiconductor allows the device to be
programmed with a PC using National Semiconductor’s
Codeloader
interface can also be programmed over the USB port of
the PC. To program the LMK02000 through the USB
port, a separate interface board that is available from
National
N
It should be noted that the user may be
required to select a different LPT port that is
compatible with the capabilities of the PC being
used to program the device. Using the USB
Semiconductor
software.
Figure 12. LMK02000 Codeloader software communication port setup for programming
The
is
serial
required.
ADC14DS105KARB Reference Design Board User’s Guide
programming
directly
See
- 11 -
http://www.national.com/appinfo/interface/clk_condition
ers.html
and to order any necessary hardware such as
programming cables or USB interface boards.
The procedure for programming the LMK02000
through National’s Codeloader software and special
parallel port cable is described here if the user intends
to program the ADC14DS105KARB reference board for
sampling rates other than 100 MSPS. Please note that
the VCXO and possibly the loop filter components must
be changed to achieve sampling rates other than 100
MSPS.
The
configuration screens and their contents required to
properly program the LMK02000 Clock Conditioner
using either a parallel port or USB PC interface with
appropriate cable. These configuration screens are for
programming the LMK02000 to lock a 100 MHz VCXO
to a 25 MHz reference, which is the same configuration
used on the ADC14DS105KARB reference board. The
settings below are programmed using the PIC-module
included in this evaluation kit.
Remove JP1 if using Codeloader to program the
LMK02000.
following
port requires a separate interface board,
available from National Semiconductor.
to download Codeloader, obtain a user’s guide
figures
illustrate
www.national.com
the
Codeloader
Rev 0.2