12-Bit, 170 MSPS/210 MSPS/250 MSPS,

1.8 V Analog-to-Digital Converter

AD9634

Rev. 0

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FEATURES

250 MSPS

Total power consumption: 360 mW at 250 MSPS

1.8 V supply voltages

LVDS (ANSI-644 levels) outputs

Integer 1-to-8 input clock divider (625 MHz maximum input)

Sample rates of up to 250 MSPS

IF sampling frequencies of up to 350 MHz

Internal ADC voltage reference

Flexible analog input range

1.4 V p-p to 2.0 V p-p (1.75 V p-p nominal)

ADC clock duty cycle stabilizer

Serial port control

Energy-saving power-down modes

User-configurable, built-in self test (BIST) capability

APPLICATIONS

Communications

Diversity radio systems

Multimode digital receivers (3G)

TD-SCDMA, WiMAX, W-CDMA, CDMA2000, GSM, EDGE, LTE

I/Q demodulation systems

Smart antenna systems

General-purpose software radios

Ultrasound equipment

Broadband data applications

FUNCTIONAL BLOCK DIAGRAM

12

REFERENCE

SERIAL PORT

SCLK

SDIO

CSB

CLK+

CLK–

1-TO-8

CLOCK DIVIDER

AD9634

VIN+

D0±/D1±

D10±/D11±

DCO±

OR±

VIN–

VCM

AVDD

AGND

DRVDD

.

.

.

PARALLEL

DDR LVDS

AND

DRIVERS

PIPELINE

12-BIT

ADC

Figure 1.

GENERAL DESCRIPTION

The AD9634 is a 12-bit, analog-to-digital converter (ADC) with

sampling speeds of up to 250 MSPS. The AD9634 is designed to

support communications applications where low cost, small size,

wide bandwidth, and versatility are desired.

The ADC core features a multistage, differential pipelined

architecture with integrated output error correction logic. The

ADC features wide bandwidth inputs that can support a variety

of user-selectable input ranges. An integrated voltage reference

eases design considerations. A duty cycle stabilizer (DCS) is

provided to compensate for variations in the ADC clock duty cycle,

allowing the converter to maintain excellent performance.

The ADC output data are routed directly to the external 12-bit

LVDS output port.

Flexible power-down options allow significant power savings,

when desired.

Programming for setup and control is accomplished using a

3-wire, SPI-compatible serial interface.

The AD9634 is available in a 32-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 12-bit, 170 MSPS/210 MSPS/250 MSPS ADC.

2. Fast overrange and threshold detect.

3. Proprietary differential input maintains excellent SNR

performance for input frequencies of up to 350 MHz.

4. 3-pin, 1.8 V SPI port for register programming and readback.

5. Pin compatibility with the AD9642, allowing a simple

migration up to 14 bits, and with the AD6672.