ANALOG DEVICES AD9265 Service Manual

16-Bit, 125 MSPS/105 MSPS/80 MSPS,

A

FEATURES

SNR = 79.0 dBFS @ 70 MHz and 125 MSPS
SFDR = 93 dBc @ 70 MHz and 125 MSPS
Low power: 373 mW @ 125 MSPS

1.8 V analog supply operation

1.8 V CMOS or LVDS output supply
Integer 1-to-8 input clock divider
IF sampling frequencies to 300 MHz

−154.3 dBm/Hz small signal input noise with 200 Ω input
impedance @ 70 MHz and 125 MSPS

Optional on-chip dither
Programmable internal ADC voltage reference
Integrated ADC sample-and-hold inputs
Flexible analog input range: 1 V p-p to 2 V p-p
Differential analog inputs with 650 MHz bandwidth
ADC clock duty cycle stabilizer
Serial port control
User-configurable, built-in self-test (BIST) capability
Energy-saving power-down modes

1.8 V Analog-to-Digital Converter

AD9265

PRODUCT HIGHLIGHTS

1. On-chip dither option for improved SFDR performance

with low power analog input.

2. Proprietary differential input that maintains excellent SNR

performance for input frequencies up to 300 MHz.

3. Operation from a single 1.8 V supply and a separate digital

output driver supply accommodating 1.8 V CMOS or
LVDS outputs .

4. Standard serial port interface (SPI) that supports various

product features and functions, such as data formatting
(offset binary, twos complement, or gray coding), enabling
the clock duty cycle stabilizer, DCS, power-down, test
modes, and voltage reference mode.

5. Pin compatibility with the AD9255, allowing a simple

migration from 16 bits down to 14 bits.

APPLICATIONS

Communications
Multimode digital receivers (3G)

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

and TD-SCDMA
Smart antenna systems
General-purpose software radios
Broadband data applications
Ultrasound equipment

RBIASSENSE PDWN

VREF

VCM

VIN+

VIN–

DITHER

CLK+

CLK–

SYNC

REFERENCE

TRACK-AND-HOLD

MANAGEMENT

FUNCTIONAL BLOCK DIAGRAM

GNDAVDD (1.8V) LVDS LVDS_RS

AD9265

CSB

OUTPUT

STAGING

CMOS OR

LVDS
(DDR)

CLOCK

SVDD

ADC
16-BIT
CORE

16 16

SERIAL PORT

SCLK/

SDIO/

DFS

DCS

Figure 1.

DRVDD (1.8V)

D15 TO D0

OR

DCO

08502-001

Rev. A

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