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PDF XRD87L75 Data sheet ( Hoja de datos )
| Número de pieza | XRD87L75 | |
| Descripción | Low-Voltage CMOS 8-Bit High-Speed Analog-to-Digital Converter | |
| Fabricantes | Exar Corporation | |
| Logotipo |  |
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FEATURES
· 8-Bit Resolution
· Up to 10MHz 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)
· Latch-Up Free
XRD87L75
Low-Voltage CMOS 8-Bit High-Speed
Analog-to-Digital Converter
· ESD Protection: 2000V Minimum
· Small 20-Pin SOIC/SSOP Packages
April 2==2 1
APPLICATIONS
· Digital Color Copiers
· Cellular Telephones
· CCD-Based Systems
· Hardware Scanners
· Video Capture Boards
GENERAL DESCRIPTION
The XRD87L75 is an 8-bit Analog-to-Digital Converter in
a small 20-pin SOIC/SSOP package. Designed using
an advanced 3.3V CMOS process, this part offers
excellent 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 XRD87L75 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
XRD87L75.
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 0.4V at
VRB and 1.72V 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 +3.3V supply. Power
consumption is 25mW at FS = 6MHz.
Specified for operation over the commercial / industrial
(-40 to +85°C) temperature range, the XRD87L75 is
available in Surface Mount (SOIC), Shrink Small Out-
line (SSOP) and Plastic Dual-In-line (PDIP) Packages.
Rev. 1.00
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • (510) 668-7000 • FAX (510) 668-7017
1 page  
XRD87L75
Figure 1. XRD87L75 Timing Diagram
Figure 2. DNL Measurement
Figure 3. INL Error Calculation
Figure 4. Equivalent Input Circuit
Rev. 1.00
Figure 5. Typical Circuit Connections
5
5 Page 
XRD87L75
Graph 10. FFT Plot
80
Vdd = 3.3V
Vrt = 2.5V
60 Vrb = 0.5V
Fs = 6MHz
40 Fin = 500KHz
20
0
-20
-40
-60
-80
-100
-120
0.0 0.5 1.0 1.5 2.0 2.5 3.0
Frequency (MHz)
Graph 10. FFT Plot
Rev. 1.00
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet XRD87L75.PDF ] | |
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