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PDF XRD8775 Data sheet ( Hoja de datos )

Número de pieza XRD8775
Descripción CMOS 8-Bit High Speed Analog-to-Digital Converter
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No Preview Available ! XRD8775 Hoja de datos, Descripción, Manual

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XRD8775
CMOS 8-Bit High Speed
Analog-to-Digital Converter
FEATURES
· 8-Bit Resolution
· Up to 20MHz Sampling Rate
· Internal S/H Function
· Single Supply: 5V
· VIN DC Range: 0V to VDD
· VREF DC Range: 1V to VDD
· Low Power: 75mW typ. (excluding reference)
· Latch-Up Free
· ESD Protection: 2000V Minimum
April 2002-4
· 3V Version: XRD87L75
· Small 20-Pin SOIC/SSOP Packages
APPLICATIONS
· Digital Color Copiers
· Cellular Telephones
· CCD-Based Systems
· Hardware Scanners
· Video Capture Boards
GENERAL DESCRIPTION
The XRD8775 is an 8-bit Analog-to-Digital Converter in
a small 20-pin SOIC/SSOP package. Designed using
an advanced 5V CMOS process, this part offers excel-
lent performance, low power consumption 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 XRD8775 includes an
on-chip S/H function and allows the user to digitize
analog input signals between AGND and AVDD. 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
XRD8775.
SIMPLIFIED BLOCK AND TIMING DIAGRAM
The designer can choose the internally generated
reference voltages by connecting VRB to VRBS and VRT to
VRTS , or provide external reference voltages to the VRB
and VRT pins. The internal reference generates 0.6V at
VRB and 2.6V at VRT. Providing external reference
voltages allows easy interface to any input signal range
between GND and VDD. 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 XRD8775 is
available in Surface Mount (SOIC), Shrink Small Out-
line (SSOP) and Plastic Dual-In-line (PDIP) Packages.
Rev. 4.00
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 (510) 668-7000 FAX (510) 668-7017

1 page




XRD8775 pdf
XRD8775
Figure 1. XRD8775 Timing Diagram
Figure 2. DNL Measurement
Figure 3. INL Error Calculation
Figure 4. Equivalent Input Circuit
Rev. 4.00
Figure 5. Typical Circuit Connections
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XRD8775 arduino
80
60
40
20
0
-20
-40
-60
-80
-100
-120
0.0
1.5 3.0 4.5
Freq (MHz)
Graph 10. FFT Plot
XRD8775
Vdd = 5.0V
Vrt = 2.6V
Vrb = 0.6V
Fs = 15MHz
Fin = 500KHz
6.0 7.5
Rev. 4.00
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