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ADC80Z-12 View Datasheet(PDF) - Analog Devices

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ADC80Z-12 Datasheet PDF : 12 Pages
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12-Bit Successive-Approximation
Integrated Circuit A/D Converter
AD ADC80
FEATURES
True 12-Bit Operation: Max Nonlinearity ؎0.012%
Low Gain T.C.: ؎30 ppm/؇C Max
Low Power: 800 mW
Fast Conversion Time: 25 s
Precision 6.3 V Reference for External Application
Short-Cycle Capability
Parallel Data Output
Monolithic DAC with Scaling Resistors for Stability
Low Chip Count—High Reliability
Industry-Standard Pinout
Z Models for ؎12 V Supplies
PRODUCT DESCRIPTION
The AD ADC80 is a complete 12-bit successive-approximation
analog-to-digital converter that includes an internal clock, refer-
ence, and comparator. Its hybrid IC design uses MSI digital and
linear monolithic chips in conjunction with a 12-bit monolithic
DAC to provide modular performance and versatility with IC
size, price, and reliability.
Important performance characteristics of the AD ADC80 include
a maximum linearity error at 25ЊC of ± 0.012%, maximum gain
T.C. of 30 ppm/ЊC, typical power dissipation of 800 mW, and
maximum conversion time of 25 s. Monotonic operation of the
feedback D/A converter guarantees no missing codes over the
temperature range of 25ЊC to +85ЊC.
The design of the AD ADC80 includes scaling resistors that
provide analog signal ranges of ± 2.5 V, ± 5.0 V, ± 10 V, 0 V to
+5.0 V, or 0 V to +10.0 V. The 6.3 V precision reference may
be used for external applications. All digital signals are fully
DTL and TTL compatible; output data is in parallel form.
The AD ADC80 is available in grades specified for use over
the 25ЊC to +85ЊC temperature range and is available in a
32-lead ceramic DIP.
The Serial Output function is no longer supported on this product after date
code 9616.
REV. D
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
FUNCTIONAL BLOCK DIAGRAM
BIT 6 1
BIT 5 2
BIT 4 3
BIT 3 4
BIT 2 5
BIT 1 (MSB) 6
5V ANALOG
SUPPLY 7
BIT 1 (MSB) 8
5V DIGITAL
SUPPLY 9
DIGITAL GND 10
COMPARATOR
IN
11
BIPOLAR
OFFSET OUT
12
10V SPAN IN 13
20V SPAN IN 14
ANALOG GND 15
GAIN ADJUST 16
12-BIT
SAR
12-BIT DAC
CLOCK
AND
CONTROL
CIRCUITS
COMP
REFERENCE
AD ADC80
NC = NO CONNECT
32 BIT 7
31 BIT 8
30 BIT 9
29 BIT 10
28 BIT 11
27
BIT 12
(LSB)
26 NC
–15V OR
25 –12V
24
REF OUT
(6.3V)
23
CLOCK
OUT
22 STATUS
21 SHORT
CYCLE
20 CLOCK
INHIBIT
19
EXTERNAL
CLOCK IN
18 CONVERT
START
17
15V OR
12V
PRODUCT HIGHLIGHTS
1. The AD ADC80 is a complete 12-bit A/D converter. No
external components are required to perform a conversion.
2. A monolithic 12-bit feedback DAC is used for reduced chip
count and higher reliability.
3. The internal buried Zener reference is laser trimmed to 6.3 V.
The reference voltage is available externally and can supply
up to 1.5 mA beyond that required for the reference and
bipolar offset current.
4. The scaling resistors are included on the monolithic DAC
for exceptional thermal tracking.
5. The AD ADC80 directly replaces other devices of this type,
providing significant increases in performance.
6. The fast conversion rate of the AD ADC80 makes it an
excellent choice for applications requiring high system
throughput rates.
7. The short cycle and external clock options are provided
for applications requiring faster conversion speed or
lower resolution.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved.
 

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