Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

AD7654 Scheda tecnica(PDF) 10 Page - Analog Devices

Il numero della parte AD7654
Spiegazioni elettronici  16-Bit, 1,-1 LSB INL,500 kSPS, Differential ADC
Download  20 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD7654 Scheda tecnica(HTML) 10 Page - Analog Devices

Back Button AD7654 Datasheet HTML 6Page - Analog Devices AD7654 Datasheet HTML 7Page - Analog Devices AD7654 Datasheet HTML 8Page - Analog Devices AD7654 Datasheet HTML 9Page - Analog Devices AD7654 Datasheet HTML 10Page - Analog Devices AD7654 Datasheet HTML 11Page - Analog Devices AD7654 Datasheet HTML 12Page - Analog Devices AD7654 Datasheet HTML 13Page - Analog Devices AD7654 Datasheet HTML 14Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 20 page
background image
REV. B
AD7676
–10–
IN+
REF
REFGND
IN–
32,768C 16,384C
MSB
4C
2C
C
C
LSB
SW+
SWITCHES
CONTROL
32,768C 16,384C
MSB
4C
2C
C
C
LSB
SW
BUSY
OUTPUT
CODE
CNVST
CONTROL
LOGIC
COMP
Figure 3. ADC Simplified Schematic
CIRCUIT INFORMATION
The AD7676 is a fast, low power, single-supply, precise 16-bit
analog-to-digital converter (ADC). The AD7676 is capable of
converting 500,000 samples per second (500 kSPS) and allows
power saving between conversions. When operating at 100 SPS,
for example, it typically consumes only 15
µW. This feature
makes the AD7676 ideal for battery-powered applications.
The AD7676 provides the user with an on-chip track-and-hold,
successive-approximation ADC that does not exhibit any pipeline
or latency, making it ideal for multiple multiplexed channel
applications.
The AD7676 can be operated from a single 5 V supply and be
interfaced to either 5 V or 3 V digital logic. It is housed in a
48-lead LQFP package or a 48-lead LFCSP package that combines
space savings and allows flexible configurations as either serial
or parallel interface. The AD7676 is pin-to-pin compatible with
the AD7675.
CONVERTER OPERATION
The AD7676 is a successive-approximation analog-to-digital
converter based on a charge redistribution DAC. Figure 3 shows
the simplified schematic of the ADC. The capacitive DAC consists
of two identical arrays of 16 binary weighted capacitors.
During the acquisition phase, terminals of the array tied to the
comparator’s input are connected to AGND via SW+ and SW.
All independent switches are connected to the analog inputs.
Thus, the capacitor arrays are used as sampling capacitors and
acquire both analog signals.
When the acquisition phase is complete and the
CNVST input
goes or is low, a conversion phase is initiated. When the conversion
phase begins, SW+ and SWare opened first. The two capacitor
arrays are then disconnected from the inputs and connected to
the REFGND input. Therefore, the differential voltage between
the output of IN+ and IN– captured at the end of the acquisition
phase is applied to the comparator inputs, causing the comparator
to become unbalanced.
By switching each element of the capacitor array between
REFGND or REF, the comparator input varies by binary
weighted voltage steps (VREF/2, VREF/4 ... VREF/65536). The
control logic toggles these switches, starting with the MSB first,
in order to bring the comparator back into a balanced condition.
After the completion of this process, the control logic generates
the ADC output code and brings BUSY output LOW.
Transfer Functions
Using the OB/
2C digital input, the AD7676 offers two output
codings: straight binary and twos complement. The ideal transfer
characteristic for the AD7676 is shown in Figure 4.
000...000
000...001
000...010
111...101
111...110
111...111
ANALOG INPUT
+FS – 1.5 LSB
+FS – 1 LSB
–FS + 1 LSB
–FS
–FS + 0.5 LSB
Figure 4. ADC Ideal Transfer Function
TEMPERATURE – C
5
3
–5
–55
135
–35
–15
–5
15
35
55
75
95
1
–1
–3
115
4
2
0
–2
–4
–FS
OFFSET
+FS
TPC 13. Drift vs. Temperature


Codice articolo simile - AD7654

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Analog Devices
AD7654 AD-AD7654 Datasheet
818Kb / 32P
   16-Bit, 750 kSPS, Unipolar/Bipolar Programmable Input PulSAR ADC
REV. 0
AD7654 AD-AD7654 Datasheet
426Kb / 24P
   16-Bit, 250 kSPS CMOS ADC
REV. B
AD7654 AD-AD7654 Datasheet
820Kb / 32P
   16-Bit, 250 kSPS, Unipolar/Bipolar Programmable Input PulSAR ADC
REV. 0
AD7654 AD-AD7654 Datasheet
810Kb / 28P
   16-Bit, 1.5 LSB INL, 2 MSPS PulSAR ADC
REV. 0
AD7654 AD-AD7654 Datasheet
1Mb / 28P
   18-Bit, 2.5 LSB INL, 800 kSPS SAR ADC
REV. 0
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20


Scheda tecnica Scarica

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEETIT.COM
Lei ha avuto il aiuto da alldatasheet?  [ DONATE ] 

Di alldatasheet   |   Richest di pubblicita   |   contatti   |   Privacy Policy   |   scambio Link   |   Ricerca produttore
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