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PDF ADC08031 Data sheet ( Hoja de datos )
| Número de pieza | ADC08031 | |
| Descripción | 8-Bit High-Speed Serial I/O A/D Converters with Multiplexer Options/ Voltage Reference/ and Track/Hold Function |
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| Fabricantes | National Semiconductor | |
| Logotipo |  |
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June 1999
ADC08031/ADC08034/ADC08038
8-Bit High-Speed Serial I/O A/D Converters with
Multiplexer Options, Voltage Reference, and Track/Hold
Function
General Description
The ADC08031/ADC08032/ADC08034/ADC08038 are 8-bit
successive approximation A/D converters with serial I/O and
configurable input multiplexers with up to 8 channels. The
serial I/O is configured to comply with the NSC MICROW-
IRE™ serial data exchange standard for easy interface to the
COPS™ family of controllers, and can easily interface with
standard shift registers or microprocessors.
The ADC08034 and ADC08038 provide a 2.6V band-gap de-
rived reference. For devices offering guaranteed voltage ref-
erence performance over temperature see ADC08131,
ADC08134 and ADC08138.
A track/hold function allows the analog voltage at the positive
input to vary during the actual A/D conversion.
The analog inputs can be configured to operate in various
combinations of single-ended, differential, or
pseudo-differential modes. In addition, input voltage spans
as small as 1V can be accommodated.
Applications
n Digitizing automotive sensors
n Process control monitoring
n Remote sensing in noisy environments
n Instrumentation
n Test systems
n Embedded diagnostics
Features
n Serial digital data link requires few I/O pins
n Analog input track/hold function
n 2-, 4-, or 8-channel input multiplexer options with
address logic
n 0V to 5V analog input range with single 5V power
supply
n No zero or full scale adjustment required
n TTL/CMOS input/output compatible
n On chip 2.6V band-gap reference
n 0.3" standard width 8-, 14-, or 20-pin DIP package
n 14-, 20-pin small-outline packages
Key Specifications
n Resolution
8 bits
n Conversion time (fC= 1 MHz)
8µs (max)
n Power dissipation
20mW (max)
n Single supply
n Total unadjusted error
5VDC (±5%)
±1⁄2 LSB and ±1LSB
n No missing codes over temperature
Ordering Information
Industrial (−40˚C ≤ TA ≤ +85˚C)
ADC08031CIN
ADC08031CIWM, ADC08034CIWM
ADC08038CIWM
Package
N08E
M14B
M20B
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
COPS™ microcontrollers and MICROWIRE™ are trademarks of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS010555
www.national.com
1 page  
Electrical Characteristics (Continued)
Note 4: When the input voltage VIN at any pin exceeds the power supplies (VIN < (AGND or DGND) or VIN > VCC) the current at that pin should be limited to 5 mA.
The 20 mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 5 mA to four pins.
Note 5: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA and the ambient temperature, TA. The maximum
allowable power dissipation at any temperature is PD = (TJMAX − TA)/θJA or the number given in the Absolute Maximum Ratings, whichever is lower. For devices with
suffixes CIN and CIWM TJMAX = 125˚C. The typical thermal resistances (θJA) of these parts when board mounted follow: ADC08031CIN 120˚C/W, ADC08031CIWM
140˚C/W, ADC08034 CIWM 140˚C/W, ADC08038CIWM suffixes 91˚C/W.
Note 6: Human body model, 100 pF capacitor discharged through a 1.5 kΩ resistor.
Note 7: See AN450 “Surface Mounting Methods and Their Effect on Product Reliability” or Linear Data Book section “Surface Mount” for other methods of soldering
surface mount devices.
Note 8: Typicals are at TJ = 25˚C and represent the most likely parametric norm.
Note 9: Guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 10: Total unadjusted error includes offset, full-scale, linearity, multiplexer.
Note 11: For VIN(−) ≥ VIN(+) the digital code will be 0000 0000. Two on-chip diodes are tied to each analog input (see Block Diagram) which will forward-conduct for
analog input voltages one diode drop below ground or one diode drop greater than VCC supply. During testing at low VCC levels (e.g., 4.5V), high level analog inputs
(e.g., 5V) can cause an input diode to conduct, especially at elevated temperatures, which will cause errors for analog inputs near full-scale. The spec allows 50 mV
forward bias of either diode; this means that as long as the analog VIN does not exceed the supply voltage by more than 50 mV, the output code will be correct. Ex-
ceeding this range on an unselected channel will corrupt the reading of a selected channel. Achievement of an absolute 0 VDC to 5 VDC input voltage range will there-
fore require a minimum supply voltage of 4.950 VDC over temperature variations, initial tolerance and loading.
Note 12: Channel leakage current is measured after a single-ended channel is selected and the clock is turned off. For off channel leakage current the following two
cases are considered: one, with the selected channel tied high (5 VDC) and the remaining seven off channels tied low (0 VDC), total current flow through the off chan-
nels is measured; two, with the selected channel tied low and the off channels tied high, total current flow through the off channels is again measured. The two cases
considered for determining on channel leakage current are the same except total current flow through the selected channel is measured.
Note 13: A 40% to 60% duty cycle range insures proper operation at all clock frequencies. In the case that an available clock has a duty cycle outside of these limits
the minimum time the clock is high or low must be at least 450 ns. The maximum time the clock can be high or low is 100 µs.
Note 14: Since data, MSB first, is the output of the comparator used in the successive approximation loop, an additional delay is built in (see Block Diagram) to allow
for comparator response time.
Typical Performance Characteristics
Linearity Error vs
Reference Voltage
Linearity Error vs
Temperature
Linearity Error vs
Clock Frequency
DS010555-32
Power Supply Current vs
Temperature
Output Current vs
Temperature
DS010555-33
DS010555-34
Power Supply Current
vs Clock Frequency
DS010555-35
DS010555-36
5
DS010555-37
www.national.com
5 Page 
Functional Description (Continued)
enabled and whether this input is single-ended or differential.
Differential inputs are restricted to adjacent channel pairs.
For example, channel 0 and channel 1 may be selected as a
differential pair but channel 0 or 1 cannot act differentially
with any other channel. In addition to selecting differential
mode the polarity may also be selected. Channel 0 may be
selected as the positive input and channel 1 as the negative
input or vice versa. This programmability is best illustrated by
the MUX addressing codes shown in the following tables for
the various product options.
The MUX address is shifted into the converter via the DI line.
Because the ADC08031 contains only one differential input
channel with a fixed polarity assignment, it does not require
addressing.
The common input line (COM) on the ADC08038 can be
used as a pseudo-differential input. In this mode the voltage
on this pin is treated as the “−” input for any of the other input
channels. This voltage does not have to be analog ground; it
can be any reference potential which is common to all of the
inputs. This feature is most useful in single-supply applica-
tions where the analog circuity may be biased up to a poten-
tial other than ground and the output signals are all referred
to this potential.
TABLE 1. Multiplexer/Package Options
Part
Number of Analog
Number
Channels
Single-Ended Differential
ADC08031
1
1
ADC08032
2
1
ADC08034
4
2
ADC08038
8
4
Number of
Package
Pins
8
8
14
20
TABLE 2. MUX Addressing: ADC08038
Single-Ended MUX Mode
MUX Address
Analog Single-Ended Channel #
START
SGL/
ODD/
SELECT
01
23
45
6 7 COM
DIF
SIGN
1
0
1 1 0 00+
−
1 1 0 01
+
−
1 1 0 10
+−
1 1 0 11
+−
1 1 1 00
+
−
1 1 1 01
+
−
1 1 1 10
+−
1 1 1 11
+−
Differential MUX Mode
MUX Address
START
SGL/
ODD/
DIF SIGN
1 00
1 00
1 00
1 00
1 01
1 01
1 01
1 01
TABLE 3. MUX Addressing: ADC08038
SELECT
10
00
01
10
11
00
01
10
11
0
01
+−
−+
Analog Differential Channel-Pair #
12
2345
+−
+−
−+
−+
3
67
+−
−+
11 www.national.com
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ADC08031.PDF ] | |
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