AD9684 datasheet(4/65 Pages) AD

4 / 65 page

Data Sheet

AD9684

The AD9684 has several functions that simplify the automatic

gain control (AGC) function in a communications 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 reduce

the system gain to avoid an overrange condition at the ADC

input. In addition to the fast detect outputs, the AD9684 also

offers signal monitoring capability. The signal monitoring block

provides additional information about the signal that the ADC

digitized.

The dual ADC output data is routed directly to the one external,

14-bit LVDS output port, supporting double data rate (DDR)

formatting. An external data clock and status bit are offered for

data capture flexibility.

The LVDS outputs have several configurations, depending on

the acceptable rate of the receiving logic device and the sampling

rate of the ADC. Multiple device synchronization is supported

through the SYNC± input pins.

The AD9684 has flexible power-down options that allow

significant power savings when desired. All of these features can

be programmed using a 1.8 V to 3.4 V capable 3-wire serial port

interface (SPI).

The AD9684 is available in a Pb-free, 196-ball ball grid array

(BGA) and is specified over the −40°C to +85°C industrial

temperature range. This product is protected by a U.S. patent.

PRODUCT HIGHLIGHTS

1. Wide full power bandwidth supports intermediate

frequency (IF) sampling of signals up to 2 GHz.

2. Buffered inputs with programmable input termination ease

filter design and implementation.

3. Four integrated wideband decimation filters and NCO

blocks supporting multiband receivers.

4. Flexible SPI controls various product features and functions

to meet specific system requirements.

5. Programmable fast overrange detection and signal

monitoring.

6. SYNC± input allows synchronization of multiple devices.

7. 12 mm × 12 mm, 196-ball BGA_ED.

Rev. 0 | Page 3 of 64

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