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AD6655-150EBZ1 데이터시트(PDF) 4 Page - Analog Devices

부품명 AD6655-150EBZ1
상세설명  IF Diversity Receiver
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
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AD6655-150EBZ1 데이터시트(HTML) 4 Page - Analog Devices

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AD6655
Rev. 0 | Page 4 of 84
GENERAL DESCRIPTION
The AD6655 is a mixed-signal intermediate frequency (IF) receiver
consisting of dual 14-bit, 80 MSPS/105 MSPS/125 MSPS/150 MSPS
ADCs and a wideband digital downconverter (DDC). The AD6655
is designed to support communications applications where low
cost, small size, and versatility are desired.
The dual ADC core features a multistage, differential pipelined
architecture with integrated output error correction logic. Each
ADC features wide bandwidth differential sample-and-hold
analog input amplifiers supporting a variety of user-selectable
input ranges. An integrated voltage reference eases design consid-
erations. A duty cycle stabilizer is provided to compensate for
variations in the ADC clock duty cycle, allowing the converters
to maintain excellent performance.
ADC data outputs are internally connected directly to the digital
downconverter (DDC) of the receiver, simplifying layout and
reducing interconnection parasitics. The digital receiver has two
channels and provides processing flexibility. Each receive channel
has four cascaded signal processing stages: a 32-bit frequency
translator (numerically controlled oscillator (NCO)), a half-
band decimating filter, a fixed FIR filter, and an fADC/8 fixed-
frequency NCO.
In addition to the receiver DDC, the AD6655 has several
functions that simplify the automatic gain control (AGC)
function in the system receiver. The fast detect feature allows
fast overrange detection by outputting four bits of input level
information with short latency.
In addition, the programmable threshold detector allows
monitoring of the incoming signal power using the four fast
detect bits of the ADC with low latency. If the input signal level
exceeds the programmable threshold, the coarse upper threshold
indicator goes high. Because this threshold indicator has low
latency, the user can quickly turn down the system gain to avoid
an overrange condition.
The second AGC-related function is the signal monitor. This
block allows the user to monitor the composite magnitude of the
incoming signal, which aids in setting the gain to optimize the
dynamic range of the overall system.
After digital processing, data can be routed directly to the two
external 14-bit output ports. These outputs can be set from 1.8 V
to 3.3 V CMOS or as 1.8 V LVDS. The CMOS data can also be
output in an interleaved configuration at a double data rate using
only Port A.
The AD6655 receiver digitizes a wide spectrum of IF frequencies.
Each receiver is designed for simultaneous reception of the main
channel and the diversity channel. This IF sampling architecture
greatly reduces component cost and complexity compared with
traditional analog techniques or less integrated digital methods.
Flexible power-down options allow significant power savings,
when desired.
Programming for setup and control is accomplished using a 3-bit
SPI-compatible serial interface.
The AD6655 is available in a 64-lead LFCSP and is specified over
the industrial temperature range of −40°C to +85°C.


유사한 부품 번호 - AD6655-150EBZ1

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Analog Devices
AD6655-150EBZ1 AD-AD6655-150EBZ1 Datasheet
2Mb / 88P
   IF Diversity Receiver
REV. A
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