AD6657A datasheet(3/36 Pages) AD

3 / 36 page

Data Sheet

AD6657A

Rev. 0 | Page 3 of 36

With the NSR block disabled, the ADC data is provided directly to

the output with a resolution of 11 bits. The AD6657A can achieve

up to 66.5 dBFS SNR for the entire Nyquist bandwidth when

operated in this mode. This allows the AD6657A to be used in

telecommunication applications such as a digital predistortion

observation path where wider bandwidths are used.

After digital signal processing, multiplexed output data is

routed into two 11-bit output ports such that the maximum

digital data rate (DDR) is 400 Mbps. These outputs are set at

1.8 V LVDS and support ANSI-644 levels.

The AD6657A receiver digitizes a wide spectrum of IF frequencies.

Each receiver is designed for simultaneous reception of a separate

antenna. 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.

Programming for device setup and control is accomplished

using a 3-wire SPI-compatible serial interface with numerous

modes to support board level system testing.

The AD6657A is available in a Pb-free, RoHS compliant,

144-ball, 10 mm × 10 mm chip scale package ball grid array

(CSP_BGA) that is specified over the industrial temperature

range of −40°C to +85°C.

PRODUCT HIGHLIGHTS

1. Four analog-to-digital converters (ADCs) are contained in

a small, space-saving, 10 mm × 10 mm × 1.4 mm, 144-ball

CSP_BGA package.

2. Pin selectable noise shaping requantizer (NSR) function

that allows for improved SNR within a reduced bandwidth

of up to 65 MHz at 185 MSPS.

3. LVDS digital output interface configured for low cost

FPGA families.

4. 230 mW per ADC core power consumption.

5. Operation from a single 1.8 V supply.

6. Standard SPI that supports various product features and

functions, such as data formatting (offset binary or twos

complement), NSR, power-down, test modes, and voltage

reference mode.

7. On-chip integer 1-to-8 input clock divider and multichip

sync function to support a wide range of clocking schemes

and multichannel subsystems.

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