DC1298A-AA Linear Technology, DC1298A-AA Datasheet - Page 16

• Manufacturer Part Number: DC1298A-AA
• Description: BOARD EVAL LTM9002-AA
• Manufacturer: Linear Technology
• Type: Baseband Receiverr

Specifications of DC1298A-AA

• Design Resources: Demo Circuit 1298A Schematic
• Frequency: 0Hz ~ 300MHz
• Features: LTM9002 14bit Dual Receiver Subsystem, DC-170MHz LPF
• Tool / Board Applications: Wireless Connectivity-ZigBee, RF, Infrared, USB
• Mcu Supported Families: LTM9002
• Development Tool Type: Hardware - Eval/Demo Board
• For Use With/related Products: LTM9002
• Lead Free Status / RoHS Status: Not applicable / Not applicable

LTM9002
OPERATION
Description
The LTM9002 is an integrated system in a package (SiP) that
includes two high-speed 14-bit A/D converters, matching
networks, anti-aliasing fi lters and two low noise, differen-
tial amplifi ers with fi xed gain. These amplifi ers need not
be the same, so that the gains and input impedances of
the two channels are different. Also included is a pair of
auxiliary DACs to allow for digital, full-scale adjustment
of each channel. The LTM9002 is designed for digitizing
high frequency, wide dynamic range signals with input
frequencies up to 300MHz. Typical applications include
digitizing in-phase and quadrature channels or main and
diversity channels in base station applications.
The following sections describe in further detail the op-
eration of each section. The SiP technology allows the
LTM9002 to be customized and this is described in the
fi rst section. The outline of the remaining sections follows
the basic functional elements as shown in Figure 1.
Table 1. Semi-Custom Options
Select Combination of Options from Columns Below
16
AMPLIFIER IF
DC-300MHz
DC-140MHz
DC-70MHz
DC-35MHz
300MHz
140MHz
RANGE
AMPLIFIER
Figure 1. Basic Functional Elements
AMPLIFIER INPUT
200Ω (Channel A)
400Ω (Channel B)
IMPEDANCE
AUXILIARY
NETWORK
INPUT
200Ω
200Ω
400Ω
DAC
ADC
50Ω
50Ω
20dB (Channel A)
AMPLIFIER GAIN
8dB (Channel B)
ADC
26dB
26dB
20dB
14dB
8dB
9002 F01
170MHz LPF
25MHz LPF
FILTER
TBD
Semi-Custom Options
The μModule construction affords a new level of fl exibility
in application-specifi c standard products. Standard ADC
and amplifi er components can be integrated regardless
of their process technology and matched with passive
components to a particular application. The LTM9002-AA,
as the fi rst example, is confi gured with a dual 14-bit ADC
sampling at rates up to 125Msps. The amplifi er gain is
26dB with an input impedance of 50Ω and an input range
of 100mV
to optimize the interface between the amplifi er output
and the ADC under these conditions. Additionally, there
is a 3rd order lowpass fi lter with a cutoff at 170MHz. The
auxiliary DACs allow adjustment of the full-scale range
with 12-bit resolution.
However, other options are possible through Linear
Technology’s semi-custom development program. Linear
Technology has in place a program to deliver other speed,
resolution, IF range, gain and fi lter confi gurations for nearly
any specifi ed application. These semi-custom designs are
based on existing ADCs and amplifi ers with an appropriately
modifi ed matching network. The fi nal subsystem is then
tested to the exact parameters defi ned for the application.
The fi nal result is a fully integrated, accurately tested and
optimized solution in the same package. For more details
on the semi-custom receiver subsystem program, contact
Linear Technology.
ADC SAMPLE
125Msps
125Msps
105Msps
65Msps
80Msps
65Msps
40Msps
25Msps
10Msps
RATE
P-P
(–16dBm). The matching network is designed
RESOLUTION
14-Bit
12-Bit
14-Bit
12-Bit
10-Bit
ADC
AUXILIARY
12-Bit, SPI
12-Bit, I
None
None
DAC
2
C
PART NUMBER
LTM9002-AA
LTM9002-LA
9002f