AD9284 Datasheet, PDF (1/24 Pages) Analog Devices – 8-Bit, 250 MSPS, 1.8 V Dual Analog-to-Digital Converter (ADC)

8-Bit, 250 MSPS, 1.8 V Dual
Analog-to-Digital Converter (ADC)
AD9284
FEATURES
GENERAL DESCRIPTION
Single 1.8 V supply operation
SNR: 49.3 dBFS at 200 MHz input at 250 MSPS
SFDR: 65 dBc at 200 MHz input at 250 MSPS
Low power: 314 mW at 250 MSPS
On-chip reference and track-and-hold
1.2 V p-p analog input range for each channel
Differential input with 500 MHz bandwidth
LVDS-compliant digital output
DNL: ±0.2 LSB
Serial port control options
Offset binary, Gray code, or twos complement data format
Optional clock duty cycle stabilizer
Built-in selectable digital test pattern generation
Pin-programmable power-down function
Available in 48-lead LFCSP
APPLICATIONS
Communications
Diversity radio systems
I/Q demodulation systems
Battery-powered instruments
Handheld scope meters
Low cost digital oscilloscopes
OTS: video over fiber
The AD9284 is a dual 8-bit, monolithic sampling, analog-to-digital
converter (ADC) that supports simultaneous operation and is
optimized for low cost, low power, and ease of use. Each ADC
operates at up to a 250 MSPS conversion rate with outstanding
dynamic performance.
The ADC requires a single 1.8 V supply and an encode clock for
full performance operation. No external reference components
are required for many applications. The digital outputs are LVDS
compatible.
The AD9284 is available in a Pb-free, 48-lead LFCSP that is
specified over the industrial temperature range of −40°C to +85°C.
PRODUCT HIGHLIGHTS
1. Integrated Dual 8-Bit, 250 MSPS ADC.
2. Single 1.8 V Supply Operation with LVDS Outputs.
3. Power-Down Option Controlled via a Pin-Programmable
Setting.
FUNCTIONAL BLOCK DIAGRAM
SDIO/
PWDN CSB SCLK OE
CLK+
CLK–
VIN+A
VIN–A
VCM
VREF
1.0V
V_REF
VIN–B
VIN+B
SPI
ADC
D7+ (MSB), D7– (MSB)
D0+ (LSB), D0– (LSB)
(CHANNEL A)
REF
SELECT
×1.5
CLOCK
MANAGEMENT
DCO
GENERATION
DCO+
DCO–
ADC
D7+ (MSB), D7– (MSB)
D0+ (LSB), D0– (LSB)
(CHANNEL B)
AD9284
RBIAS
AGND
AVDD DRVDD DRGND
Figure 1.
Rev. 0
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