DC1250A-AA Linear Technology, DC1250A-AA Datasheet - Page 2

• Manufacturer Part Number: DC1250A-AA
• Description: BOARD EVAL LTM9001-AA
• Manufacturer: Linear Technology
• Type: Baseband Receiverr

Specifications of DC1250A-AA

• Design Resources: Demo Circuit 1250A Schematic
• Frequency: 0Hz ~ 300MHz
• Features: LTM9001 16bit Receiver Subsystem, 162MHz BPF
• 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
ADDITIONAL INFORMATION
Although the DC1250 demo board is ready to use on de-
livery, it has additional flexibility built in for various types
of input networks. Below is some information about con-
figuring DC1250 to meet the specific needs of your eval-
uation.
APPLYING INPUT SIGNALS
The input network consists of various components de-
signed to allow either single-ended or differential inputs,
AC-coupled or DC-coupled. Table 2 shows some possi-
ble input configurations, and which components to in-
stall. LTM9001 is designed for excellent performance
with both single-ended and differential input drive, with
little difference in distortion performance. When using
DC-coupled inputs, the inputs to DC1250 need to be lev-
2
clock source (e.g. DC1216)
(HP 8644B) or other
RF Signal Generator
NOTE. Even a high-quality signal
synthesizer will still have noise and
harmonics that should be attenuated
with a low-pass or band-pass filter.
For good-quality high order filters,
see TTE, Lark Engineering, or
equivalent.
low phase noise
HP 8644B
Generator
or equiv.
Signal
BPF
BPF
Figure 1.
(3.8V-6V @ 1.0A)
Power Supply
Proper Evaluation Equipment Setup
el-shifted to within the input common-mode limits in the
datasheet.
Table 2: DC1250 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.
CONFIGURATION
Single-Ended Input
AC-Coupled
(Default Setup)
Single-Ended Input
No Transformer
AC-Coupled
Single-Ended Input
No Transformer
DC-Coupled
Differential Inputs
COMPONENTS NECESSARY
No change. Transformer T1 acts as a balun for
Remove T1, replace with 0Ω jumpers. May need
Same as above. Change C1 and C8 to 0Ω jum-
Remove R7 and install R5. T1 and C1/C8 can be
differential drive.
pers. Inputs must be within the common-
mode voltage limits of LTM9001.
replaced with 0Ω for DC coupling.
to install impedance-matching resistor at R4
or R1/R7.
To DC890