參數(shù)資料
型號(hào)： LTM9005CV-AA#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PBGA204
封裝： 22 X 15 MM, 4.32 MM HEIGHT, LEAD FREE, MO-222, LGA-204
文件頁(yè)數(shù)： 4/24頁(yè)
文件大?。?/td> 468K
代理商： LTM9005CV-AA#PBF
LTM9005
12
9005p
operaTion
DESCRIPTION
The LTM9005 is an integrated System in a Package (SiP)
that includes a high-speed 14-bit A/D converter, two low-
distortionfixed-gainamplifiers,aSAWfilter,acontinuously
variable attenuator and an active mixer. The LTM9005 is
designed for very compact IF sampling applications with
RF input frequencies up to 3.8GHz. Typical applications
include wireless base stations, remote radio heads and
communications test instrumentation.
All of the supply bypassing and passive filtering has been
included inside the LTM9005 making the total solution size
extremely small. Furthermore, the tight coupling makes
the performance more consistent and less dependent on
board layout. Great care has been taken to protect sensi-
tive signals from noise within the Module package and
isolate the RF section from the digital section.
The overall gain is optimized for the dynamic range of the
ADC relative to the RF input level allowed by the mixer. The
equivalent cascaded noise figure is 16dB. The RF input
level for –1dBFs is typically –19dBm.
The following sections describe the operation of each
functional element. The SiP technology allows the
LTM9005 to be customized and this is described in the
Semi-CustomOptionssection.Theoutlineoftheremaining
sections follows the basic functional elements as shown
in Figure 2.
RFInputPort
LOInputPort
ADCClockInputPort
GAINControlInput
SENSEandReferenceInput
DigitalOutputs
ShutdownControl
PowerSupplies
Layout
SEMI-CUSTOM OPTIONS
The Module construction affords a new level of flexibility
inapplication-specificstandardproducts.Standardmixed-
signal,IFandRFcomponentscanbeintegratedregardless
of their process technology and matched with passive
components to a particular application. The LTM9005-AA,
as the first example, is configured with a 14-bit ADC
sampling at rates up to 125Msps. The total system gain
is 22dB of which 20dB is variable. The IF is fixed by the
SAWfilterat140MHzwith16MHzbandwidth.TheRFrange
is matched for 1.6GHz to 2.3GHz with external matching
required to achieve 400MHz to 3.8GHz.
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, RF/IF range, gain and filter configurations for
nearlyanyspecifiedapplication.ADCresolutionandspeed
options range from 14-bits and 125Msps to 10-bits and
10Msps. The IF can be set from 70MHz to about 270MHz
with bandwidths from a few MHz to about 60MHz. These
semi-custom designs are based on existing ADCs, am-
plifiers, filters and mixers with appropriately modified
matching networks. The final subsystem is then tested
to the exact parameters defined for the application. The
final 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.
Figure 2. Basic Functional Elements
LTM9005
VCC2
VDD
OVDD
OGND
ADC CLK
ADC
GAIN CONTROL
GND
LO
MIXER
ATTENUATOR
RF
VCC1
VCC3
SAW
BPF
1ST
AMPLIFIER
2ND
AMPLIFIER
9005 F02
The Applications section describes the design consider-
ations and recommendations for interfacing to the key
ports and functions as well as board layout in the follow-
ing order:
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