|
|
PDF ADCV08832 Data sheet ( Hoja de datos )
| Número de pieza | ADCV08832 | |
| Descripción | Low Voltage/ 8-Bit Serial I/O CMOS A/D Converter with Sample/Hold Function | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de ADCV08832 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
|
No Preview Available !
May 2001
ADCV08832
Low Voltage, 8-Bit Serial I/O CMOS A/D Converter with
Sample/Hold Function
General Description
The ADCV08832 is a low voltage, 8-Bit successive approxi-
mation analog-to-digital converter with a 3-wire serial inter-
face. The serial I/O will interface to microcontrollers, PLD’s,
microprocessors, DSPs or shift registers. The serial I/O is
configured to comply with the NSC MICROWIRE™ serial
data exchange standard.
To minimize total power consumption, the ADCV08832 can
be set to go into low power mode whenever it is not perform-
ing conversions.
A sample/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 com-
binations of single-ended, differential, or pseudo-differential
modes.
Features
n 3-wire serial digital data link requires few I/O pins
n Single supply 2.7V to 5V
n Analog input track/hold function
n Analog input voltage range from GND to VCC
n No zero or full scale adjustment required
n TTL/CMOS input/output compatible
n Superior pin compatible replacement for TLV0832 and
ADC0832
Applications
n Digitizing sensors and waveforms
n Process control monitoring
n Remote sensing in noisy environments
n Instrumentation
n Embedded systems
n Low power circuits
Key Specifications
(For 3.3V supply, typical, unless otherwise noted)
n Resolution
8 bits
n Conversion time (fCLK = 500 kHz)
n Power dissipation
n Power down mode
16 µs (max)
1.7 mW
<0.1 µW
n Total Unadjusted Error
±0.8 LSB
n No missing codes over temperature (−40˚C to +125˚C)
Connection Diagram
ADCV08832
SOIC-8 Package
Ordering Information
Temperature Range
Industrial (−40˚C ≤ TJ ≤ +125˚C)
ADCV08832CIM
ADCV08832CIMX
DS200084-1
Package
M08A
M08A
Package
Marking
ADC08832I
ADC08832I
Transport
Media
95 Units in Rail
2500 Units in
Tape and Reel
COPS™ and MICROWIRE™ are trademarks of National Semiconductor Corporation.
© 2001 National Semiconductor Corporation DS200084
www.national.com
1 page  
ADCV08832 Functional Block Diagram
5 www.national.com
5 Page 
Functional Description (Continued)
digitally analyze the frequency components of the signal.
Depending on the application, further digital processing can
be applied.
6.1 Sampling Rate
The Sampling Rate, sometimes referred to as the Through-
put Rate, is the time between repetitive samples by an
Analog-to-Digital Converter. The sampling rate includes the
conversion time, as well as other factors such a MUX setup
time, acquisition time, and interfacing time delays. Typically,
the sampling rate is specified in the number of samples
taken per second, at the maximum analog-to-digital con-
verter clock frequency.
Signals with frequencies exceeding the Nyquist frequency
(1/2 the sampling rate), will be aliased into frequencies be-
low the Nyquist frequency. To prevent signal degradation,
sample at twice (or more) than the highest frequency com-
ponent of the input signal and/or use of a low pass
(anti-aliasing) filter on the front-end. Sampling at a much
higher rate than the input signal will reduce the requirements
of the anti-aliasing filter.
6.2 Signal-to-Noise Ratio
Signal-to-Noise Ratio (SNR) is the ratio of RMS magnitude
of the fundamental to the RMS sum of all the
non-fundamental signal, excluding the harmonics, up to 1/2
of the sampling frequency (Nyquist).
6.3 Total Harmonic Distortion
Total Harmonic distortion is the ratio of the RMS sum of the
amplitude of the harmonics to the fundamental input fre-
quency.
THD = 20 log [(V22 + V32+ V42+ V52+ V62) 1/2/V1]
Where V1 is the RMS amplitude of the fundamental and
V2,V3, V4, V5, V6 are the RMS amplitudes of the individual
Applications
harmonics. In theory, all harmonics are included in THD
calculations, but in practice only about the first 6 make
significant contributions and require measurement.
6.4 Signal-to-Noise and Distortion
Signal-to-Noise And Distortion ratio (SINAD) is the ratio of
RMS magnitude of the fundamental to the RMS sum of all
the non-fundamental signals, including the noise and har-
monics, up to 1/2 of the sampling frequency (Nyquist), ex-
cluding DC.
SINAD is also dependent on the number of quantization
levels in the A/D Converter used in the waveform sampling
process. The more quantization levels, the smaller the quan-
tization noise and theoretical noise performance. The theo-
retical SINAD for a n-Bit Analog-to-Digital Converter is given
by:
SINAD = (6.02 n + 1.76) dB
Thus, for an 8-bit converter, the ideal SINAD = 49.92 dB
6.5 Effective Number of Bits
Effective Number Of Bits (ENOB) is another specification to
quantify dynamic performance. The equation for ENOB is
given by:
ENOB = [(SINAD - 1.76) / 6.02]
Like SINAD, the Effective Number Of Bits combines the
cumulative effect of several errors, including quantization,
ADC non-linearities, noise, and distortion.
6.6 Spurious Free Dynamic Range
Spurious Free Dynamic Range (SFDR) is the ratio of the
signal amplitude to the amplitude of the highest harmonic or
spurious noise component. If the amplitude is at full scale,
the specification is simply the reciprocal of the peak har-
monic or spurious noise.
Protecting the Input
DS200084-9
11
www.national.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ADCV08832.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ADCV08832 | Low Voltage/ 8-Bit Serial I/O CMOS A/D Converter with Sample/Hold Function | National Semiconductor |
| ADCV08832 | ADCV08832 Low Voltage 8-Bit Serial I/O CMOS A/D Convrtr w/Sample-Hold Func (Rev. A) |  Texas Instruments |
| ADCV08832CIM | Low Voltage/ 8-Bit Serial I/O CMOS A/D Converter with Sample/Hold Function | National Semiconductor |
| ADCV08832CIMX | Low Voltage/ 8-Bit Serial I/O CMOS A/D Converter with Sample/Hold Function | National Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |