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XRD8785 Datasheet(PDF) 1 Page - Exar Corporation

Part No. XRD8785
Description  CMOS 8-Bit High Speed Analog-to-Digital Converter
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Maker  EXAR [Exar Corporation]
Homepage  http://www.exar.com
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XRD8785 Datasheet(HTML) 1 Page - Exar Corporation

 
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EXAR Corporation, 48720 Kato Road, Fremont, CA 94538
• (510) 668-7000 • FAX (510) 668-7017
Rev. 3.00
XRD8785
CMOS 8-Bit High Speed
Analog-to-Digital Converter
April 2002
FEATURES
• 8-Bit Resolution
• Up to 20 MHz Sampling Rate
• Internal S/H Function
• Single Supply: 5V
• VIN DC Range: 0V to V
DD
• VREF DC Range: 1V to V
DD
• Low Power: 75mW typ. (excluding reference)
• Latch-Up Free
• ESD Protection: 2000V Minimum
GENERAL DESCRIPTION
The XRD8785 is an 8-bit Analog-to-Digital Converter.
Designed using an advanced 5V CMOS process, this
part offers excellent performance, low power con-
sumption, and latch-up free operation.
This device uses a two-step flash architecture to
maintain low power consumption at high conversion
rates. The input circuitry of the XRD8785 includes an
on-chip S/H function which allows the user to digitize
analog input signals between AGND and AV
DD. Careful
design and chip layout have achieved a low analog
input capacitance. This reduces “kickback” and eases
the requirements of the buffer/amplifier used to drive
the XRD8785. The designer can choose the internally
generated reference voltages by connecting V
RB to
• 20-Pin Package Available: XRD8775
• 3V Version: XRD87L85
APPLICATIONS
• Digital Color Copiers
• Cellular Telephones
• CCDs and Scanners
• Video Capture Boards
V
RBS and VRT to VRTS, or provide external reference
voltages to the V
RB and VRT pins. The internal reference
generates 0.6V at V
RB and 2.6 V at VRT. Providing
external reference voltages allows easy interface to
any input signal range between AGND and AV
DD. This
also allows the system to adjust these voltages to
cancel zero scale and full scale errors, or to change the
input range as needed.
The device operates from a single +5V supply. Power
consumption is 75mW at FS = 15MHz. Specified for
operation over the commercial/industrial (–40 to
+85°C) temperature range, the XRD8785 is available in
Plastic Dual-in-line (PDIP), Surface Mount (SOIC) and
Small Outline (SOP) packages in EIAJ and JEDEC.
SIMPLIFIED BLOCK AND TIMING DIAGRAM


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