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PDF ADC574 Data sheet ( Hoja de datos )
| Número de pieza | ADC574 | |
| Descripción | Microprocessor-Compatible ANALOG-TO-DIGITAL CONVERTER | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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®
FPO
ADC574A
Microprocessor-Compatible
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q COMPLETE 12-BIT A/D CONVERTER WITH
REFERENCE, CLOCK, AND 8-, 12-, or 16-
BIT MICROPROCESSOR BUS INTERFACE
q IMPROVED PERFORMANCE SECOND
SOURCE FOR 574A-TYPE A/D
CONVERTERS
Conversion Time: 25µs max
Bus Access Time: 150ns max
AO Input: Bus Contention During Read
Operation Eliminated
q DUAL IN-LINE PLASTIC, PLCC AND
HERMETIC CERAMIC
q FULLY SPECIFIED FOR OPERATION ON
±12V OR ±15V SUPPLIES
q NO MISSING CODES OVER
TEMPERATURE:
0°C to +75°C: ADC574AJ and K Grades
–55°C to +125°C: ADC574ASH, TH
DESCRIPTION
The ADC574A is a 12-bit successive approximation
analog-to-digital converter, utilizing state-of-the-art
CMOS and laser-trimmed bipolar die custom-designed
for freedom from latch-up and for optimum AC per-
formance. It is complete with a self-contained +10V
reference, internal clock, digital interface for micropro-
cessor control, and three-state outputs.
The reference circuit, containing a buried zener, is laser-
trimmed for minimum temperature coefficient. The
clock oscillator is current-controlled for excellent sta-
bility over temperature. Full-scale and offset errors may
be externally trimmed to zero. Internal scaling resistors
are provided for the selection of analog input signal
ranges of 0V to +10V, 0V to +20V, ±5V, and ±10V.
The converter may be externally programmed to pro-
vide 8- or 12-bit resolution. The conversion time for 12
bits is factory set for 25µs maximum.
Output data are available in a parallel format from TTL-
compatible three-state output buffers. Output data are
coded in straight binary for unipolar input signals and
bipolar offset binary for bipolar input signals.
The ADC574A, available in both industrial and military
temperature ranges, requires supply voltages of +5V
and ±12V or ±15V. It is packaged in a 28-pin plastic
DIP, and a hermetic side-brazed ceramic DIP.
Control
Inputs
Bipolar
Offset
20V Range
10V Range
Reference
Input
Reference
Output
Control Logic
Clock
Comparator
12-Bit D/A
Converter
10V
Reference
Status
Parallel
Data
Output
International Airport Industrial Park • Mailing Address: PO Box 11400 • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1984 Burr-Brown Corporation
PDS-550G
Printed in U.S.A., August, 1993
1 page  
DISCUSSION OF
SPECIFICATIONS
LINEARITY ERROR
Linearity error is defined as the deviation of actual code
transition values from the ideal transition values. Ideal
transition values lie on a line drawn through zero (or minus
full scale for bipolar operation) and plus full scale. The zero
value is located at an analog input value 1/2LSB before the
first code transition (000H to 001H). The full-scale value is
located at an analog value 3/2LSB beyond the last code
transition (FFEH to FFFH) (see Figure 1).
FFFH
FFEH
FFDH
802H
801H
800H
7FFH
7FEH
002H
001H
000H
Full-Scale
Calibration
Error
Rotates
The
Line
Offset
Error
Shifts
The Line
(Bipolar
Offset
Transaction)
Midscale
(Bipolar
Zero)
1/2LSB
Zero
(–Full Scale)
Zero
(–Full-Scale
1/2LSB
Calibration
Transition)
Analog Input
3/2LSB
+Full-Scale
Calibration
Transition
+Full
Scale
FIGURE 1. ADC574A Transfer Characteristics Terminology.
Thus, for a converter connected for biopolar operation and
with a full-scale range (or span) of 20V (±10V), the zero
value of –10V is 2.44mV below the first code transition
(000H to 001H at –9.99756V) and the plus full-scale value of
+10V is 7.32mV above the last code transition (FFEH to
FFFH at +9.99268) (see Table I).
NO MISSING CODES
(DIFFERENTIAL LINEARITY ERROR)
A specification which guarantees no missing codes requires
that every code combination to appear in a monotonically-
increasing sequence as the analog input is increased through-
out the range. Thus, every input code width (quantum) must
have a finite width. If an input quantum has a value of zero
(a differential linearity error of –1LSB), a missing code will
occur.
ADC574AKP, KN, KH and TH grades are guaranteed to
have no missing codes to 12-bit resolution over their re-
spective specification temperature ranges.
UNIPOLAR OFFSET ERROR
An ADC574A connected for unipolar operation has an
analog input range of 0V to plus full scale. The first output
code transition should occur at an analog input value 1/2
LSB above 0V. Unipolar offset error is defined as the
deviation of the actual transition value from the ideal value.
The unipolar offset temperature coefficient specifies the
change of this transition value versus a change in ambient
temperature.
BIPOLAR OFFSET ERROR
A/D converter specifications have historically defined bipo-
lar offset as the first transition value above the minus full-
scale value. The ADC574A specification, however, follows
the terminology defined for the 574 converter several years
ago. Thus, bipolar offset is located near the midscale value
of 0V (bipolar zero) at the output code transition 7FFH to
800H.
Bipolar offset error for the ADC574A is defined as the
deviation of the actual transition value from the ideal
transition value located 1/2LSB below 0V. The bipolar
offset temperature coefficient specifies the maximum change
of the code transition value versus a change in ambient
temperature.
FULL SCALE CALIBRATION ERROR
The last output transition (FFEH to FFFH) occurs for an
analog input value 3/2LSB below the nominal full-scale
value. The full-scale calibration error is the deviation of the
actual analog value at the last transition point from the ideal
value. The full-scale calibration temperature coefficient
specifies the maximum change of the code transition value
versus a change in ambient temperature.
POWER SUPPLY SENSITIVITY
Electrical specifications for the ADC574A assume the
application of the rated power supply voltages of +5V and
±12V or ±15V. The major effect of power supply voltage
BINARY (BIN) OUTPUT
Analog Input Voltage Range
One Least Significant Bit (LSB)
Output Transition Values
FFEH to FFFH
7FFH to 800H
Defined as:
FSR
2n
n=8
n =12
INPUT VOLTAGE RANGE AND LSB VALUES
±10V
±5V
20V
2n
78.13mV
4.88mV
10V
2n
39.06mV
2.44mV
0 to +10V
10V
2n
39.06mV
2.44mV
0 to +20V
20V
2n
78.13mV
4.88mV
+Full-Scale Calibration
Midscale Calibration (Bipolar Offset)
+10V – 3/2LSB
0 – 1/2LSB
+5 – 3/2LSB
0 – 1/2LSB
+10V – 3/2LSB +10V – 3/2LSB
+5V – 1/2LSB ±10V – 1/2LSB
TABLE I. Input Voltages, Transition Values, and LSB Values.
5
ADC574A
®
5 Page | ||
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| PDF Descargar | [ Datasheet ADC574.PDF ] | |
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