AD9627 Datasheet, PDF (3/40 Pages) Analog Devices – 12-Bit, 80/105/125/150 MSPS, 1.8 V Dual Analog-to-Digital Converter

Preliminary Technical Data
GENERAL DESCRIPTION
The AD9627 is a dual 12-Bit 150 MSPS ADC. The AD9627 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
considerations. A duty cycle stabilizer is provided to compen-
sate for variations in the ADC clock duty cycle, allowing the
converters to maintain excellent performance.
The AD9627 has several functions which simply the AGC
function in the system receiver. The fast detect feature allows
fast overrange detection by outputting 4 bits of input level
information with very short latency. Additionally, the
programmable threshold detector allows monitoring of the
incoming signal power from the ADC’s 4 fast detect bits with
very low latency. If the input signal level exceeds the
programmable threshold, the decrement gain indicator will go
high. Because this threshold is set from the 4 MSB’s this allows
the user to 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.
The ADC output data can be routed directly to the two external
AD9627
12-bit output ports. These outputs can be set from 1.8V to
3.3V CMOS. Or 1.8V LVDS.
Flexible power-down options allow significant power savings,
when desired.
PRODUCT HIGHLIGHTS
• Integrated dual 12-Bit 150 MSPS ADC.
• Fast Over-range Detect and Signal monitor with Serial
Output
• Signal monitor block with dedicate serial output mode.
• Proprietary, differential input maintains excellent SNR
performance for input frequencies up to 450 MHz.
• The AD9627 operates from a single 1.8 Volt supply and
features a separate digital output driver supply to
accommodate 1.8 V to 3.3 V logic families.
• A standard serial port interface supports various product
features and functions, such as data formatting (offset
binary, twos complement, or gray coding), enabling the
clock DCS, power-down, and voltage reference mode.
• The AD9627 is pin compatible with the AD9640, allowing
a simple migration from 12 to 14 Bits.
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