ADC774JH BURR-BROWN [Burr-Brown Corporation], ADC774JH Datasheet

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ADC774JH

Manufacturer Part Number
ADC774JH
Description
Microprocessor-Compatible ANALOG-TO-DIGITAL CONVERTER
Manufacturer
BURR-BROWN [Burr-Brown Corporation]
Datasheet
1.ADC774JH.pdf (8 pages)
FEATURES
DESCRIPTION
The ADC774 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-
International Airport Industrial Park
© 1988 Burr-Brown Corporation
Control
Inputs
Bipolar
Offset
20V Range
10V Range
Reference
Input
Reference
Output
Tel: (520) 746-1111
COMPLETE 12-BIT A/D CONVERTER WITH
REFERENCE, CLOCK, AND 8-, 12-, or 16-
BIT MICROPROCESSOR BUS INTERFACE
ALTERNATE SOURCE FOR HI774 A/D
CONVERTER: 8.5 s Conversion Time,
150ns Bus Access Time
FULLY SPECIFIED FOR OPERATION ON
NO MISSING CODES OVER
TEMPERATURE:
0 C to +75 C: ADC774J, K
–55 C to +125 C: ADC774SH, TH
12V OR 15V SUPPLIES
ANALOG-TO-DIGITAL CONVERTER
•
Twx: 910-952-1111
Microprocessor-Compatible
®
•
Mailing Address: PO Box 11400
•
Cable: BBRCORP
Comparator
•
•
Telex: 066-6491
PDS-835E
Tucson, AZ 85734
Clock
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 8.5 s 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 ADC774, 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, or a hermetic side-brazed ceramic DIP.
Control Logic
12-Bit D/A
Reference
Converter
•
10V
FAX: (520) 889-1510
• Street Address: 6730 S. Tucson Blvd.
•
Immediate Product Info: (800) 548-6132
Printed in U.S.A. March, 1992
ADC774
• Tucson, AZ 85706
Status
Parallel
Data
Output

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ADC774JH Summary of contents

Page 1

Microprocessor-Compatible ANALOG-TO-DIGITAL CONVERTER FEATURES COMPLETE 12-BIT A/D CONVERTER WITH REFERENCE, CLOCK, AND 8-, 12-, or 16- BIT MICROPROCESSOR BUS INTERFACE ALTERNATE SOURCE FOR HI774 A/D CONVERTER: 8.5 s Conversion Time, 150ns Bus Access Time FULLY SPECIFIED FOR OPERATION ON ...

Page 2

SPECIFICATIONS ELECTRICAL +12V or +15V –12V or –15V PARAMETER RESOLUTION INPUTS ANALOG Voltage Ranges: Unipolar Bipolar Impedance +10V, 5V 10V +20V DIGITAL (CE, CS, ...

Page 3

... S, T Grades Storage *Same specification as ADC774JH, JP, SH. NOTES: (1) With fixed 50 resistor from Ref Out to Ref In. This parameter is also adjustable to zero at +25C. ( this specification table means Full Scale Range. That is, for a 10V input range FS means 20V; for +10V range, FS means 10V. The term Full Scale for these specification instead of Full-Scale Range is used to be consistent with other vendors' specifications tables. (3) Using internal reference. (4) See “ ...

Page 4

... BURN-IN SCREENING OPTION See text for details. TEMPERATURE MODEL PACKAGE ADC774JP-BI Plastic DIP +75 C ADC774KP-BI Plastic DIP +75 C ADC774JH-BI Ceramic DIP +75 C ADC774KH-BI Ceramic DIP +75 C ADC774SH-BI Ceramic DIP – +125 C ADC774TH-BI Ceramic DIP – +125 C ® ...

Page 5

CONTROLLING THE ADC774 This is an abridged data sheet. For Discussion of Specifica- tions, Installation, Calibration refer to ADC574A data sheet or order PDS-835. The Burr-Brown ADC774 can be easily interfaced to most microprocessor systems and other digital systems. The ...

Page 6

Figure 1 illustrates timing when conversion is initiated by an R/C pulse which goes low and returns to the high state during the conversion. In this case, the three-state outputs go to the high-impedance state in response to the falling ...

Page 7

CONVERSION START The converter is commanded to initiate a conversion by a transition occurring on any of three logic inputs (CE, CS, and R/C) as shown in Table II. Conversion is initiated by the last of the three to reach ...

Page 8

... This datasheet has been download from: www.datasheetcatalog.com Datasheets for electronics components. ...

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