DC1241B-BA Linear Technology, DC1241B-BA Datasheet - Page 3

• Manufacturer Part Number: DC1241B-BA
• Description: BOARD EVAL LTM9001-BA
• Manufacturer: Linear Technology
• Type: Baseband Receiverr

Specifications of DC1241B-BA

• Design Resources: DC1241B Schematic
• Frequency: 0Hz ~ 300MHz
• Features: LTM9001 16bit Receiver Subsystem, DC-300MHz LPF
• Tool / Board Applications: Wireless Connectivity-ZigBee, RF, Infrared, USB
• Mcu Supported Families: LTM9001
• Development Tool Type: Hardware - Eval/Demo Board
• For Use With/related Products: LTM9001
• Lead Free Status / RoHS Status: Not applicable / Not applicable

LTM9001 16-BIT RECEIVER SUBSYSTEM
Table 2: DC1241 Input Configuration Guide
NOTE. When driving the ADC driver with a direct DC-coupled path,
increased input bias currents may occur due to the amplifier’s input
impedance. See the LTM9001 datasheet for more details.
OTHER BOARD CIRCUITRY
Logic gate U9, installed on the back of DC1241,
enables the LVDS output buffers when DC1241 is
plugged into DC890, which pulls its input high. De-
vice U5 is an EEPROM device that is used by the
CONFIGURATION
Single-Ended In-
put
AC-Coupled
(Default Setup)
Single-Ended In-
put
No Transformer
AC-Coupled
Single-Ended In-
put
No Transformer
DC-Coupled
Differential Inputs
Figure 2. Entering the correct device information for your ADC. Select the correct parameters for the DC1241. Under
normal conditions, PSCOPE should automatically recognize the board and adjust the software settings accordingly.
COMPONENTS NECESSARY
No change. Transformer T1 acts as a
Remove T1, replace with 0Ω jumpers. May
Same as above. Change C1 and C3 to 0Ω
Remove R27 and install R26. T1 and
balun for differential drive.
jumpers. Inputs must be within the
common-mode voltage limits of
LTM9001.
C1/C3 can be replaced with 0Ω for DC
coupling.
need to install impedance-matching re-
sistor at R30 or R4/R5.
PScope software to identify the board and apply
the correct settings for the data collection.
USING PSCOPE SOFTWARE
PScope, downloadable from Linear Technology’s
website http://www.linear.com/, processes data
from the DC890 FastDAACS board and displays
FFT and signal analysis information on the com-
puter screen.
The on-board EEPROM U5 should enable auto-
matic board detection and auto-configuration of the
software, but if the user wishes to change the set-
tings, they can easily do so.
From the Configure menu in the toolbar, uncheck
“Autodetect Device”. The default settings for
DC1241A are shown in Figure 2. The LTM9001
also has an output randomizer, which the user
needs to select if it is enabled on the board. The
software will automatically un-randomize the out-
put by performing an exclusive-OR with each bit
and the LSB.
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