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Número de pieza | XRD87L85 | |
Descripción | Low-Voltage CMOS 8-Bit High-Speed Analog-to-Digital Converter | |
Fabricantes | Exar Corporation | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de XRD87L85 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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FEATURES
• 8-Bit Resolution
• Up to 10 MHz Sampling Rate
• Internal S/H Function
• Single Supply: 3.3V
• VIN DC Range: 0V to VDD
• VREF DC Range: 1V to VDD
• Low Power: 25mW typ. (excluding reference)
XRD87L85
Low-Voltage CMOS 8-Bit High-Speed
Analog-to-Digital Converter
April 2002-1
• Latch-Up Free
• ESD Protection: 2000V Minimum
• 20-Pin Package Available: XRD87L75
APPLICATIONS
• Digital Color Copiers
• Cellular Telephones
• CCDs and Scanners
• Video Capture Boards
GENERAL DESCRIPTION
The XRD87L85 is an 8-bit Analog-to-Digital Converter.
Designed using an advanced 3.3V 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 XRD87L85 includes an
on-chip S/H function which 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 XRD87L85. The designer can choose the internally
generated reference voltages by connecting VRB to
SIMPLIFIED BLOCK AND TIMING DIAGRAM
VRBS and VRT to VRTS, or provide external reference
voltages to the VRB and VRT pins. The internal reference
generates 0.4V at VRB and 1.72V at VRT. Providing
external reference voltages allows easy interface to
any input signal range between AGND and AVDD. 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 +3.3V supply.
Power consumption is 25mW at FS = 6MHz. Specified
for operation over the commercial/industrial (–40 to
+85°C) temperature range, the XRD87L85 is available
in Plastic Dual-in-line (PDIP), Surface Mount (SOIC)
and Small Outline (SOP) packages in EIAJ and
JEDEC.
Rev. 1.00
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • (510) 668-7000 • FAX (510) 668-7017
1 page XRD87L85
Figure 1. XRD87L85 Timing Diagram
Figure 2. Output Enable/Disable Timing Diagram
Figure 3. DNL Measurement
Rev. 1.00
Figure 4. INL Error Calculation
5
5 Page 50
45
40
35
30
25
20
15
10
5
0
0.01
XRD87L85
Vdd = 3.3V
Vrt = 2.5V
Vrb = 0.5V
Fs = 6MHz
Ta = 25oC
0.1
Fin (MHz)
1
Graph 9. SINAD vs. Input Frequency
10
80
60
40
20
0
-20
-40
-60
-80
-100
-120
0.0
0.5
Rev. 1.00
1.0 1.5
Frequency (MHz)
Graph 10. FFT Plot
11
2.0
Vdd = 3.3V
Vrt = 2.5V
Vrb = 0.5V
Fs = 6MHz
Fin = 500KHz
2.5 3.0
11 Page |
Páginas | Total 15 Páginas | |
PDF Descargar | [ Datasheet XRD87L85.PDF ] |
Número de pieza | Descripción | Fabricantes |
XRD87L85 | Low-Voltage CMOS 8-Bit High-Speed Analog-to-Digital Converter | Exar Corporation |
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