поискавой системы для электроныых деталей
  Russian  ▼
ALLDATASHEETRU.COM

X  

AD7417BR-REEL датащи(PDF) 9 Page - Analog Devices

номер детали AD7417BR-REEL
подробное описание детали  10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418)
Download  20 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD7417BR-REEL датащи(HTML) 9 Page - Analog Devices

Back Button AD7417BR-REEL Datasheet HTML 5Page - Analog Devices AD7417BR-REEL Datasheet HTML 6Page - Analog Devices AD7417BR-REEL Datasheet HTML 7Page - Analog Devices AD7417BR-REEL Datasheet HTML 8Page - Analog Devices AD7417BR-REEL Datasheet HTML 9Page - Analog Devices AD7417BR-REEL Datasheet HTML 10Page - Analog Devices AD7417BR-REEL Datasheet HTML 11Page - Analog Devices AD7417BR-REEL Datasheet HTML 12Page - Analog Devices AD7417BR-REEL Datasheet HTML 13Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 20 page
background image
REV. G
AD7416/AD7417/AD7418
–9–
TYPICAL CONNECTION DIAGRAM
Figure 2 shows a typical connection diagram for the AD7417.
Using the A0, A1, and A2 pins allows the user to select from up
to eight AD7417s on the same serial bus, if desired. An external
2.5 V reference can be connected at the REFIN pin. If an exter-
nal reference is used, a 10
µF capacitor should be connected
between REFIN and GND. SDA and SCL form the 2-wire I
2C
compatible interface. For applications where power consump-
tion is of concern, the automatic power-down at the end of a
conversion should be used to improve power performance. See
Operating Modes section of this data sheet.
VDD
AIN1
GND
REFIN
SUPPLY
2.7V TO
5.5V
0.1 F
10 F
10 F FOR
EXTERNAL
REFERENCE
OPTIONAL
EXTERNAL
REFERENCE
AD780/
REF-192
0V TO 2.5V
INPUT
CONVST
SDA
AIN2
AIN3
AIN4
OTI
SCL
2-WIRE
SERIAL
INTERFACE
AD7417
A0
A1
A2
C/ P
Figure 2. Typical Connection Diagram
ANALOG INPUTS
Figure 3 shows an equivalent circuit of the analog input struc-
ture of the AD7417 and AD7418. The two diodes, D1 and D2,
provide ESD protection for the analog inputs. Care must be
taken to ensure that the analog input signal never exceeds the
supply rails by more than 200 mV. This will cause these diodes
to become forward-biased and start conducting current into the
substrate. The maximum current these diodes can conduct
without causing irreversible damage to the part is 20 mA. The
capacitor C2 in Figure 3 is typically about 4 pF and can prima-
rily be attributed to pin capacitance. The resistor R1 is a lumped
component made up of the on resistance of a multiplexer and a
switch. This resistor is typically about 1 k
Ω. The capacitor C1 is
the ADC sampling capacitor and has a capacitance of 3 pF.
AIN
D1
C1
3pF
VDD
D2
C2
4pF
VBALANCE
CONVERT PHASE – SWITCH OPEN
TRACK PHASE – SWITCH CLOSED
R1
1k
Figure 3. Equivalent Analog Input Circuit
ON-CHIP REFERENCE
The AD7416/AD7417/AD7418 has an on-chip 1.2 V band gap
reference that is gained up by a switched capacitor amplifier to
give an output of 2.5 V. The amplifier is only powered up at the
start of the conversion phase and is powered down at the end of
the conversion. The on-chip reference is selected by connecting
the REFIN pin to analog ground. This causes SW1 (see Figure 4)
to open and the reference amplifier to power up during a conver-
sion. Therefore, the on-chip reference is not available externally.
An external 2.5 V reference can be connected to the REFIN pin.
This has the effect of shutting down the on-chip reference circuitry.
1.2V
REFIN
SW1
2.5V
EXTERNAL
REFERENCE
DETECT
BUFFER
1.2V
26k
24k
Figure 4. On-Chip Reference
TEMPERATURE MEASUREMENT
A common method of measuring temperature is to exploit the
negative temperature coefficient of a diode, or the base-emitter
voltage of a transistor, operated at a constant current. Unfortu-
nately, this technique requires calibration to null out the effect
of the absolute value of VBE, which varies from device to device.
The technique used in the AD7416/AD7417/AD7418 is to
measure the current change in VBE when the device is operated
at two different currents.
This is given by
∆VKT q
n N
BE
()
/1
where:
K is Boltzmann’s constant.
q is the charge on the electron (1.6
× 10-19 Coulombs).
T is the absolute temperature in Kelvins.
N is the ratio of the two currents.
I
N
I
VDD
SENSING
TRANSISTOR
SENSING
TRANSISTOR
VOUT
TO ADC
VOUT
Figure 5. Temperature Measurement Technique


Аналогичный номер детали - AD7417BR-REEL

производительномер деталидатащиподробное описание детали
logo
Analog Devices
AD7417BR-REEL AD-AD7417BR-REEL Datasheet
396Kb / 24P
   10-Bit Digital Temperature Sensor (AD7416) and Four Single-Channel ADCs
Rev. I
AD7417BR-REEL7 AD-AD7417BR-REEL7 Datasheet
396Kb / 24P
   10-Bit Digital Temperature Sensor (AD7416) and Four Single-Channel ADCs
Rev. I
More results

Аналогичное описание - AD7417BR-REEL

производительномер деталидатащиподробное описание детали
logo
Analog Devices
AD7416 AD-AD7416_10 Datasheet
396Kb / 24P
   10-Bit Digital Temperature Sensor (AD7416) and Four Single-Channel ADCs
Rev. I
ADT7411 AD-ADT7411 Datasheet
456Kb / 36P
   SPI/I2C Compatible, 10-Bit Digital Temperature Sensor and 8-Channel ADC
REV. A
ADT7411 AD-ADT7411_06 Datasheet
1Mb / 36P
   SPI짰-/I2C짰-Compatible, 10-Bit Digital Temperature Sensor and 8-Channel ADC
REV. B
ADT7411 AD-ADT7411_15 Datasheet
1Mb / 36P
   SPI-/IC-Compatible, 10-Bit Digital Temperature Sensor and 8-Channel ADC
Rev. B
logo
Texas Instruments
AMC7891 TI1-AMC7891 Datasheet
934Kb / 41P
[Old version datasheet]   Analog Monitor and Control Circuit with 10-Bit, Multi-Channel ADC and Four DACs, Temperature Sensor, and 12 GPIOs
AMC7891 TI1-AMC7891_14 Datasheet
1Mb / 42P
[Old version datasheet]   Analog Monitor and Control Circuit with 10-Bit, Multi-Channel ADC and Four DACs, Temperature Sensor, and 12 GPIOs
logo
Analog Devices
AD7417 AD-AD7417_15 Datasheet
396Kb / 24P
   10-Bit Digital Temperature Sensor
Rev. I
logo
Texas Instruments
AMC7891 TI-AMC7891_15 Datasheet
1Mb / 41P
[Old version datasheet]   Analog Monitor and Control Circuit with 10-Bit, Multi-Channel ADC and Four DACs, Temperature Sensor, and 12 GPIOs
logo
Analog Devices
AD7814 AD-AD7814_17 Datasheet
151Kb / 9P
   10-Bit Digital Temperature Sensor
AD7416 AD-AD7416_15 Datasheet
396Kb / 24P
   10-Bit Digital Temperature Sensor
Rev. I
More results


Html Pages

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


датащи скачать

Go To PDF Page


ссылки URL




Конфиденциальность
ALLDATASHEETRU.COM
Вашему бизинису помогли Аллдатащит?  [ DONATE ] 

Что такое Аллдатащит   |   реклама   |   контакт   |   Конфиденциальность   |   обмен ссыками   |   поиск по производителю
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