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PDF ADC1038 Data sheet ( Hoja de datos )
| Número de pieza | ADC1038 | |
| Descripción | ADC1031/ADC1034/ADC1038 10-Bit Serial I/O A/D Converters with Analog Multiplexer and Track/Hold Function | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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June 1999
ADC1038
10-Bit Serial I/O A/D Converter with Analog Multiplexer
and Track/Hold Function
General Description
The ADC1038 is a 10-bit successive approximation A/D con-
verters with serial I/O. The serial input controls a
single-ended analog multiplexer that selects one of 8 input
channels. The serial output data can be configured into a
left- or right-justified format.
An input track/hold is implemented by a capacitive reference
ladder and sampled-data comparator. This allows the analog
input to vary during the A/D conversion cycle.
Separate serial I/O and conversion clock inputs are provided
to facilitate the interface to various microprocessors.
Applications
n Engine control
n Process control
n Instrumentation
n Test equipment
Features
n Serial I/O ( MICROWIRE™ compatible)
n Separate asynchronous converter clock and serial data
I/O clock
n Analog input track/hold function
n Ratiometric or absolute voltage referencing
n No zero or full scale adjustment required
n 0V to 5V analog input range with single 5V power
supply
n TTL/MOS input/output compatible
n No missing codes
Key Specifications
n Resolution
n Total unadjusted error
n Single supply
n Power dissipation
n Max. conversion time (fC= 3 MHz)
n Serial data exchange time (fS= 1 MHz)
10 bit
±1 LSB (max)
5V ±5%
20 mW (max)
13.7 µs (max)
10 µs (max)
Connection Diagrams
SO Package
DS010556-2
Top View
ADC1038 In NS Package
M20B
Ordering Information
Industrial −40˚C ≤ TA ≤ +85˚C
ADC1038CIWM
Package
M20B
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
MICROWIRE™ is a trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS010556
www.national.com
1 page  
Test Circuits
t1H, t0H
DO except “TRI-STATE”
Leakage Current
DS010556-6
Timing Diagrams
DO High to Low State
DS010556-9
DS010556-7
DO Low to High State
DS010556-10
DS010556-8
DO “TRI-STATE” Rise
and Fall Times
DI Data Input Timing
DO Data Output Timing
DS010556-11
DS010556-12
DS010556-13
5 www.national.com
5 Page 
3.0 Analog Considerations (Continued)
External Reference 2.5V Full Scale
Power Supply as Reference
DS010556-20
Input Not Referred to GND
DS010556-21
DS010556-22
Note 14: *Current path must still exist from VIN(−) to ground
FIGURE 3. Analog Input Options
3.3 REFERENCE AND INPUT
The two VREF inputs are fully differential and define the zero
to full-scale input range of the A to D converter. This allows
the designer to easily vary the span of the analog input since
this range will be equivalent to the voltage difference be-
tween VREF+ and VREF−. By reducing VREF (VREF = VREF+ −
VREF−) to less than 5V, the sensitivity of the converter can be
increased (i.e., if VREF = 2V then 1 LSB = 1.95 mV). The
input/reference arrangement also facilitates ratiometric op-
eration and in many cases the chip power supply can be
used for transducer power as well as the VREF source.
This reference flexibility lets the input span not only be varied
but also offset from zero. The voltage at VREF− sets the input
level which produces a digital output of all zeros. Though VIN
is not itself differential, the reference design allows nearly
differential-input capability for many measurement applica-
tions. Figure 3 shows some of the configurations that are
possible.
Power Supply Bypassing
DS010556-23
11
DS010556-24
www.national.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ADC1038.PDF ] | |
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