AD6649 Analog Devices, AD6649 Datasheet - Page 3

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AD6649

Manufacturer Part Number
AD6649
Description
IF Diversity Receiver
Manufacturer
Analog Devices
Datasheet

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Data Sheet
ADC data outputs are internally connected directly to the digital
downconverter (DDC) of the receiver. 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)),
an optional sample rate converter, a fixed FIR filter, and an f
fixed-frequency NCO.
In addition to the receiver DDC, the AD6649 has several
functions that simplify the automatic gain control (AGC)
function in the system receiver. The programmable threshold
detector allows monitoring of the incoming signal power using
the fast detect output bits of the ADC. If the input signal level
exceeds the programmable threshold, the fast detect indicator goes
high. Because this threshold indicator has low latency, the user
can quickly turn down the system gain to avoid an overrange
condition at the ADC input.
After digital processing, data is routed directly to the 14-bit
output port. These outputs operate at ANSI or reduced swing
LVDS signal levels.
The AD6649 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
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greatly reduces component cost and complexity compared with
traditional analog techniques or less integrated digital methods.
In diversity applications, the output data format is real due to
the final NCO, which shifts the output center frequency to f
Flexible power-down options allow significant power savings,
when desired.
Programming for setup and control is accomplished using a 3-pin
SPI-compatible serial interface.
The AD6649 is available in a 64-lead LFCSP and is specified over
the industrial temperature range of −40°C to +85°C. This
product is protected by a U.S. patent.
PRODUCT HIGHLIGHTS
1. Integrated dual, 14-bit, 250 MSPS ADCs.
2. Integrated wideband filter and 32-bit complex NCO.
3. Fast overrange and threshold detect.
4. Proprietary differential input maintains excellent SNR
5. SYNC input allows synchronization of multiple devices.
6. 3-pin, 1.8 V SPI port for register programming and register
performance for input frequencies of up to 400 MHz.
readback.
AD6649
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