Moteur de recherche de fiches techniques de composants électroniques
  French  ▼
ALLDATASHEET.FR

X  

ADC-207 Fiches technique(PDF) 3 Page - Murata Power Solutions Inc.

No de pièce ADC-207
Description  7-Bit, 20MHz, CMOS Flash A/D Converters
Download  6 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  MURATA-PS [Murata Power Solutions Inc.]
Site Internet  http://www.murata-ps.com
Logo MURATA-PS - Murata Power Solutions Inc.

ADC-207 Fiches technique(HTML) 3 Page - Murata Power Solutions Inc.

  ADC-207 Datasheet HTML 1Page - Murata Power Solutions Inc. ADC-207 Datasheet HTML 2Page - Murata Power Solutions Inc. ADC-207 Datasheet HTML 3Page - Murata Power Solutions Inc. ADC-207 Datasheet HTML 4Page - Murata Power Solutions Inc. ADC-207 Datasheet HTML 5Page - Murata Power Solutions Inc. ADC-207 Datasheet HTML 6Page - Murata Power Solutions Inc.  
Zoom Inzoom in Zoom Outzoom out
 3 / 6 page
background image
OUTPUT CODING
(+REFERENCE = +5.12V, –REFERENCE = ground, MIDPOINT = no connection)
NOTE: The reference should be held to ±0.1% accuracy or better. Do not use the +5V
power supply as a reference input without precision regulation and high frequency
decoupling.
Values shown here are for a +5.12V reference. Scale other references proportionally.
Calibration equipment should test for code changes at the midpoints between these
center values shown in Table 1. For example, at the half-scale major carry, set the
input to 2.54V and adjust the reference until the code flickers equally between 63 and
64. Note also that the weighting for the comparator resistor network leaves the first
and last thresholds within 1/2LSB of the end points to adjust the code transition to the
proper midpoint values.
buffer has two enable lines, CS1 and CS2. Table 2 shows the truth table
for chip select signals. CS1 has the function of enabling/disabling bits 1
through 7. CS2 has the function of enabling/disabling bits 1 through 7 and
the overflow bit. Also, a full-scale input produces all ones, including the
overflow bit at the output. The ADC-207 has an adjustable resistor ladder
string. The top end, idle point, and bottom end are brought out for use with
applications circuits.
These pins are called +REFERENCE, MIDPOINT and –REFERENCE,
respectively. In typical operation +REFERENCE is tied to +5V, –REFERENCE
is tied to ground, and MIDPOINT is bypassed to ground. Such a configura-
tion results in a 0 to +5V input voltage range. The MIDPOINT pin can also
be tied to a +2.5V source to further improve integral linearity. This is usually
not necessary unless better than 7-bit linearity is needed.
ADC-207 OPERATION
The ADC-207 uses a switched capacitor scheme in which there is an auto-
zero phase and a sampling phase. See
Figure 1 and Timing Diagram. The ADC-207 uses a single clock input.
When the clock is at a high state (logic 1), the ADC-207 is in the auto-zero
phase (Ø1). When the clock is at a low state (logic 0), the ADC-207 is in
the sampling phase (Ø2). During phase 1, the 128 comparator outputs are
shorted to their inputs through CMOS switches. This serves the purpose
of bringing the inputs and outputs to the transition levels of the respective
comparators. The inputs to the comparators are also connected to 128
sampling capacitors. The other end of the 128 capacitors are also shorted
to 128 taps of a resistor ladder, via CMOS switches. Therefore, during
phase 1 the sampling capacitors are charged to the differential voltage
between a resistor tap and its respective comparator transition voltage.
This eliminates offset differences between comparators and yields better
temperature performance. During phase 2 (Ø2) the input voltage is applied to
the 128 capacitors, via CMOS switches. This forces the comparators to trip
either high or low. Since the comparators during phase 1 were sitting at their
transition point, they can trip very quickly to the correct state. Also during
phase 2, the outputs of the comparators are loaded into internal latches
which in turn feed a128-to-7 encoder. When going back into phase 1, the
output of the encoder is loaded into an output latch. This latch then feeds the
3-state output buffer.
This means that the ADC-207 is of pipeline design. To do a single
conversion, the ADC-207 requires a positive pulse followed by a negative
pulse followed by a positive pulse. Continuous conversion requires one
cycle/sample (one positive pulse and one negative pulse). The 3-state
CLOCK
OUTPUT
DATA
AUTO
ZERO
N DATA
N+1 DATA
SAMPLE
N
SAMPLE
N + 1
SAMPLE
N + 2
AUTO
ZERO
AUTO
ZERO
17ns max.
17ns max.
Æ1
Æ2
Æ1
Æ1
Æ2
Æ2
TIMING DIAGRAM
Analog Input
(Center Value)
Code
Overflow
1234567
Decimal
Hexadecimal
(Incl. 0V)
MSB
LSB
0.00V
Zero
0
0000000
0
00
+0.04V
+1LSB
0
0000001
1
01
+1.28V
+1/4FS
0
0100000
32
20
+2.52V
+1/2FS – 1LSB
0
0111111
63
3F
+2.56V
+1/2FS
0
1000000
64
40
+2.60V
+1/2FS + 1LSB
0
1000001
65
41
+3.84V
+3/4FS
0
1100000
96
60
+5.08V
+FS
0
1111111
127
7F
+5.12V
Overflow
1
1111111
255*
FF
*Note that the overflow code does not clear the data bits.
Table 1. ADC-207 Output Coding
Table 2. Chip Select Truth Table
CS1
CS2
Bits 1-7
Overflow Bit
0
0
3-State Mode
3-State Mode
1
0
3-State Mode
3-State Mode
0
1
Data Outputed
Data Outputed
1
1
3-State Mode
Data Outputed
NOTE: Reduce the sample time (sample pulse) to 12ns to improve performance
above 20MHz. Such a configuration will closely resemble an ideal sampler.
ADC-207
7-Bit, 20MHz, CMOS Flash A/D Converters
MDA_ADC-207.B01 Page 3 of 6
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
www.murata-ps.com


Numéro de pièce similaire - ADC-207

FabricantNo de pièceFiches techniqueDescription
logo
List of Unclassifed Man...
ADC-207 ETC-ADC-207 Datasheet
212Kb / 6P
   7- BIT 20MHZ CMOS FLASH A/D CONVERTERS
ADC-207LC ETC-ADC-207LC Datasheet
212Kb / 6P
   7- BIT 20MHZ CMOS FLASH A/D CONVERTERS
logo
DATEL, Inc.
ADC-207LC DATEL-ADC-207LC Datasheet
102Kb / 1P
   CMOS Flash A/D
ADC-207LC-C DATEL-ADC-207LC-C Datasheet
102Kb / 1P
   CMOS Flash A/D
ADC-207LE DATEL-ADC-207LE Datasheet
102Kb / 1P
   CMOS Flash A/D
More results

Description similaire - ADC-207

FabricantNo de pièceFiches techniqueDescription
logo
List of Unclassifed Man...
ADC-207 ETC-ADC-207 Datasheet
212Kb / 6P
   7- BIT 20MHZ CMOS FLASH A/D CONVERTERS
ADC-305 ETC-ADC-305 Datasheet
193Kb / 6P
   8-Bit, 20MHz CMOS A/D Converters
logo
Murata Power Solutions ...
ADC-305 MURATA-PS-ADC-305 Datasheet
234Kb / 6P
   8-Bit, 20MHz CMOS A/D Converters
logo
List of Unclassifed Man...
ADC-304 ETC-ADC-304 Datasheet
152Kb / 5P
   8-Bit, 20MHz, Low-Power Flash A/D Converters
ADC-228 ETC-ADC-228 Datasheet
143Kb / 4P
   8-Bit, 20MHz, Complete 8-Bit, 20MHz, Complete Flash A/D Converter
logo
Murata Power Solutions ...
ADC-228A MURATA-PS-ADC-228A Datasheet
177Kb / 4P
   8-Bit, 20MHz, Complete Flash A/D Converter
logo
List of Unclassifed Man...
ADS-238Q ETC1-ADS-238Q Datasheet
83Kb / 7P
   12-Bit, 20MHz, Low Power Sampling A/D Converters
logo
Murata Power Solutions ...
ADS-238Q MURATA-PS-ADS-238Q Datasheet
85Kb / 7P
   12-Bit, 20MHz, Low Power Sampling A/D Converters
logo
NXP Semiconductors
ADC0803 PHILIPS-ADC0803 Datasheet
187Kb / 18P
   CMOS 8-bit A/D converters
2002 Oct 17
ADC0803 PHILIPS-ADC0803 Datasheet
154Kb / 18P
   CMOS 8-bit A/D converters
2002 Oct 17
More results


Html Pages

1 2 3 4 5 6


Fiches technique Télécharger

Go To PDF Page


Lien URL




Politique de confidentialité
ALLDATASHEET.FR
ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Echange de liens   |   Fabricants
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com