Rainbow-electronics ADC14061 Uživatelský manuál

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ADC14061
Self-Calibrating 14-Bit, 2.5 MSPS, 390 mW A/D Converter
General Description
The ADC14061 is a self-calibrating 14-bit, 2.5 Megasample
per second analog to digital converter. It operates on a single
+5V supply, consuming just 390mW (typ).
The ADC14061 provides an easy and affordable upgrade
from 12 bit converters. The ADC14061 may also be used to
replace many hybrid converters with a resultant saving of
space, power and cost.
The ADC14061 operates with excellent dynamic perfor-
mance at input frequencies up to
1
2
the clock frequency. The
calibration feature of the ADC14061 can be used to get more
consistent and repeatable results over the entire operating
temperature range. On-command self-calibration reduces
many of the effects of temperature-induced drift, resulting in
more repeatable conversions.
The Power Down feature reduces power consumption to
less than 2mW.
The ADC14061 comes in a TQFP and is designed to operate
over the commercial temperature range of 0˚C to +70˚C.
Features
n Single +5V Operation
n Auto-Calibration
n Power Down Mode
n TTL/CMOS Input/Output compatible
Key Specifications
n Resolution 14 Bits
n Conversion Rate 2.5 Msps (min)
n DNL 0.3 LSB (typ)
n SNR (f
IN
= 500 kHz) 80 dB (typ)
n ENOB 12.8 Bits (typ)
n Supply Voltage +5V
±
5
%
n Power Consumption 390mW (typ)
Applications
n Instrumentation
n PC-Based Data Acquisition
n Data Communications
n Blood Analyzers
n Sonar/Radar
Connection Diagram
Ordering Information
Commercial
(0˚C TA +70˚C)
Package
ADC14061CCVT VEG52A 52 Pin Thin Quad Flat Pack
DS100103-1
December 1998
ADC14061 Self-Calibrating 14-Bit, 2.5 MSPS, 390 mW A/D Converter
© 1998 National Semiconductor Corporation DS100103 www.national.com
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Shrnutí obsahu

Strany 1 - ADC14061

ADC14061Self-Calibrating 14-Bit, 2.5 MSPS, 390 mW A/D ConverterGeneral DescriptionThe ADC14061 is a self-calibrating 14-bit, 2.5 Megasampleper second

Strany 2 - Block Diagram

Typical Performance CharacteristicsINL vs TemperatureDS100103-25DNL vs TemperatureDS100103-26SNR vs TemperatureDS100103-27INL vs VREFand TemperatureDS

Strany 3

Specification DefinitionsAPERTURE JITTER is the variation in aperture delay fromsample to sample. Aperture jitter shows up as input noise.APERTURE DEL

Strany 4

Timing Diagrams (Continued)DS100103-16TIMING DIAGRAM 2. Reset and Calibrationwww.national.com 12

Strany 5

Functional DescriptionOperating on a single +5V supply, the ADC14061 uses apipelined architecture and has error correction circuitry and acalibration

Strany 6 - Operating Ratings(Notes 1, 2)

Applications Information (Continued)The sign bit of the output word will be a logic low when VIN+is greater than VIN− . When VIN+ is less than VIN−, t

Strany 7 - AC Electrical Characteristics

Applications Information (Continued)To avoid signal clipping and distortion, VREF+OUTshould notexceed 3.3V, VREF−OUTshould not be below 750 mV andVCMs

Strany 8 - DS100103-12

Applications Information (Continued)DS100103-20FIGURE 7. Differential drive circuit ofFigure 6. All 5k resistors are 0.1%. Tolerance of the other resi

Strany 9

Applications Information (Continued)5.0 LAYOUT AND GROUNDINGProper grounding and proper routing of all signals are essen-tial to ensure accurate conve

Strany 10

Applications Information (Continued)6.0 DYNAMIC PERFORMANCEThe ADC14061 can achieve impressive dynamic perfor-mance. To achieve the best dynamic perfo

Strany 11 - Timing Diagrams

Applications Information (Continued)put alternates between 12 pF and 28 pF, depending upon thephase of the clock. This dynamic loaad is more difficult

Strany 12 - Timing Diagrams (Continued)

Block DiagramDS100103-2www.national.com 2

Strany 13 - Applications Information

Physical Dimensions inches (millimeters) unless otherwise notedLIFE SUPPORT POLICYNATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENT

Strany 14 - errors

Pin Descriptions and Equivalent CircuitsPinNo.Symbol Equivalent CircuitDescriptionAnalog I/O1VIN+Non-Inverting analog signal Input. With a 2.0V refere

Strany 15 - Figure 6

Pin Descriptions and Equivalent Circuits (Continued)Digital I/O10 ClockDigital clock input. The range of frequencies for this input is 300 kHz to 2.5M

Strany 16

Pin Descriptions and Equivalent Circuits (Continued)Digital Power20 VDPositive digital supply pin. This pin should be connected to the same clean,quie

Strany 17 - Figure 9

Absolute Maximum Ratings (Note 1)If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distribut

Strany 18 - Figure 10

DC and Logic Electrical CharacteristicsThe following specifications apply for AGND=DGND=DGND I/O=0V, V+=VA=VD=+5.0V, VDI/O=3.0V or 5.0V,PD=+5V, VREF+=

Strany 19 - Figure 7

AC Electrical Characteristics (Continued)The following specifications apply for AGND=DGND=DGND I/O=0V, V+=VA=VD=+5.0V, VDI/O=3.0V or 5.0V,PD=+5V, VREF

Strany 20 - NS Package Number VEG52A

AC Electrical Characteristics (Continued)DS100103-13FIGURE 1. Transfer CharacteristicsDS100103-14FIGURE 2. Errors removed by Auto-Cal cyclewww.nationa

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