Document
Data Sheet
FEATURES
12-bit 2.0 GSPS ADC, no missing codes SFDR = 80 dBc, AIN up to 1 GHz at −1 dBFS, 2.0 GSPS SFDR = 76 dBc, AIN up to 1.8 GHz at −1 dBFS, 2.0 GSPS SNR = 59 dBFS, AIN up to 1 GHz at −1 dBFS, 2.0 GSPS SNR = 58 dBFS, AIN up to 1.8 GHz at −1 dBFS, 2.0 GSPS Noise floor = −149.5 dBFS/Hz at 2.0 GSPS Power consumption: 3.5 W at 2.0 GSPS Differential analog input: 1.1 V p-p Differential clock input High speed 6- or 8-lane JESD204B serial output Subclass 1: 5.0 Gbps at 2.0 GSPS Two independent decimate by 8 or decimate by 16 filters with 10-bit NCOs Supply voltages: 1.3 V, 2.5 V Serial port control Flexible digital output modes Built-in selectable digital test patterns
12-Bit, 2.0 GSPS, 1.3 V/2.5 V Analog-to-Digital Converter AD9625
FUNCTIONAL BLOCK DIAGRAM
AVDD
AGND
DRVDD DRGND
REFERENCE
DIGITAL INTERFACE AND CONTROL
JESD204B INTERFACE
VCM
VIN+
VIN–
RBIAS
ADC CORE
DDC
fS/8 OR fS/16
SERDOUT[0]± SERDOUT[1]± SERDOUT[2]± SERDOUT[3]± SERDOUT[4]± SERDOUT[5]± SERDOUT[6]± SERDOUT[7]±
CONTROL REGISTERS
CMOS DIGITAL INPUT/ OUTPUT
LVDS DIGITAL INPUT/ OUTPUT
FD
RSTB
IRQ
SYSREF±
CLK±
CLOCK MANAGEMENT
SYNCINB±
DIVCLK±
CMOS DIGITAL INPUT/OUTPUT
AD9625
SDIO
SCLK
CSB
11814-001
Figure 1.
APPLICATIONS
Spectrum analyzers Military communications Radar High performance digital storage oscilloscopes Active jamming/antijamming Electronic surveillance and countermeasures
GENERAL DESCRIPTION
The AD9625 is a 12-bit monolithic sampling analog-to-digital converter (ADC) that operates at conversion rates of up to 2.0 giga samples per second (GSPS). This product is designed for sampling wide bandwidth analog signals up to the second Nyquist zone. The combination of wide input bandwidth, high sampling rate, and excellent linearity of the AD9625 is ideally suited for spectrum analyzers, data acquisition systems, and a wide assortment of military electronics applications, such as radar and jamming/antijamming measures. The analog input, clock, and SYSREF± signals are differential inputs. The JESD204B-based high speed serialized output is configurable in a variety of one-, two-, four-, six-, or eight-lane configurations. The product is specified over the industrial temperature range of −40°C to +85°C.
PRODUCT HIGHLIGHTS
1. 2. 3. High performance: exceptional SFDR in high sample rate applications, direct RF sampling, and on-chip reference. Flexible digital data output formats based on the JESD204B specification. Control path SPI interface port that supports various product features and functions, such as data formatting, gain, and offset calibration values.
Rev. 0
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AD9625 TABLE OF CONTENTS
Features .............................................................................................. 1 Applications .......................................................................................1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Product Highlights ........................................................................... 1 Revision History ............................................................................... 2 Specifications .....................................................................................3 DC Specifications ......................................................................... 3 AC Specifications.......................................................................... 4 Digital Specifications ................................................................... 4 Switching Specifications .............................................................. 6 Timing Specifications .................................................................. 6 Absolute Maximum Ratings ....................................................... 8 Thermal Characteristics .............................................................. 8 ESD Caution .................................................................................. 8 Pin Configuration and Function Descriptions ............................. 9 Typical Performance Characteristics ........................................... 15 Equivalent Test Circuits .......................