Os motores de busca de Datasheet de Componentes eletrônicos
  Portuguese  ▼
ALLDATASHEETPT.COM

X  

ISL26104 Folha de dados(PDF) 9 Page - Intersil Corporation

Nome de Peças ISL26104
Descrição Electrónicos  Low-Noise 24-bit Delta Sigma ADC
Download  21 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrônico  INTERSIL [Intersil Corporation]
Página de início  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL26104 Folha de dados(HTML) 9 Page - Intersil Corporation

Back Button ISL26104 Datasheet HTML 5Page - Intersil Corporation ISL26104 Datasheet HTML 6Page - Intersil Corporation ISL26104 Datasheet HTML 7Page - Intersil Corporation ISL26104 Datasheet HTML 8Page - Intersil Corporation ISL26104 Datasheet HTML 9Page - Intersil Corporation ISL26104 Datasheet HTML 10Page - Intersil Corporation ISL26104 Datasheet HTML 11Page - Intersil Corporation ISL26104 Datasheet HTML 12Page - Intersil Corporation ISL26104 Datasheet HTML 13Page - Intersil Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 21 page
background image
ISL26102, ISL26104
9
FN7608.0
October 12, 2012
Circuit Description
A key element in the ISL26102/ISL26104 A/D converters is its
low noise chopper-stabilized programmable gain amplifier. The
amplifier features seven gain settings (2x, 4x, 8x, 16x, 32x, 64x,
and 128x). On these gain settings, the amplifier has very high
input impedance but has restricted common mode range, which
does not extend all the way to the power supply rails. When the
gain of 1x is selected, the chopper-stabilized amplifier is
bypassed. The modulator input, which is used directly in 1x gain,
has a common mode range that extends to the supply rails. But,
because of this greater common mode range on the 1x gain
setting, the input current is higher than on the other gain
settings.
The ISL26102 provides the user with two fully differential signal
inputs at the multiplexer plus two other internal channel
selections, which allow the user to monitor the analog supply
voltage of the chip, and the on-chip temperature sensor. The
ISL26104 provides the user with two additional fully differential
inputs on the multiplexer.
The programmable gain amplifier has a passive RC filter on its
output. The resistors are located inside the chip on the outputs of
the differential amplifier stages. The capacitor (nominally a
100nF C0G ceramic or PPS film (Polyphenylene sulfide)) for the
filter is connected to the two CAP pins of the chip. The outputs of
the differential amplifier stages of the PGA are filtered before
their signals are presented to the delta-sigma modulator. This
filter reduces the amount of noise by limiting the signal
bandwidth and eliminating the chopping artifacts of the chopped
PGA stage.
Figure 7 illustrates a block diagram of the programmable gain
amplifier.
Functional Description
Analog Input Span
The input span of the A/D converter is determined by the
magnitude of the voltage reference and the gain setting
selection. The voltage reference magnitude is determined by the
voltage difference between the VREF+ and the VREF- pins. This
voltage may be as low as 1.5V or as great as the analog supply
voltage to the chip. The voltage on the VREF pins is scaled to accept
a voltage into the A/D converter on 1x gain of ±0.5 VREF/GAIN
where gain is 1. An illustration of the input span when using a 5V
VREF is in Figure 8. The figure illustrates that with a VREF = 5V and a
gain setting of 1x, the input span will be ±2.5V, which is a fully
differential signal. If the programmable gain amplifier gain is set to
another value other than 1x, the input span will be reduced by the
gain scale factor. With a VREF = 5V and the PGA gain set at 128x,
the input span into the ADC will be [±(0.5)5V]/128 = ±19.53mV on
a fully differential basis.
Digital Filter
The output of the delta-sigma modulator in the A/D converter is
filtered with a Sinc4 digital filter that includes programmable
decimation to achieve a wide range of output word rates. The
transfer function of the Sinc4 filter is illustrated in Figure 9.
Figure 9 is normalized to 1 being the output word rate. The
output word rate can be selected by setting bits in the OWR
(Output Word Rate) Register. The converter provides a wide
selection of word rates as shown in Table 3. Note that the word
rates are based upon an XTALIN/CLOCK of 4.9152MHz. If the
clock is a different frequency than 4.9152MHz, the actual output
word rate will scale proportionally.
TABLE 3. OUTPUT WORD RATE REGISTER SETTINGS
DATA RATE (Sps)
REGISTER CODE (Hex)
2.5
00
501
10
02
20
03
40
04
80
05
100
0B
160
06
200
0C
320
07
400
0D
640
08
800
0E
1000
11
1280
09
1600
0F
2000
12
2560
0A
3200
10
4000
13
2.50
4.50
1.00
0.00
3.00
AIN+
AIN-
VCM
2.500
2.500
0.50
2.00
1.50
3.50
4.00
5.00
FIGURE 8. DIFFERENTIAL INPUT FOR VREF = 5V, GAIN = 1X


Nº de peça semelhante - ISL26104

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Intersil Corporation
ISL26104 INTERSIL-ISL26104 Datasheet
4Mb / 20P
   Intersil?셲 Solutions for Industrial Process Control
logo
Renesas Technology Corp
ISL26104 RENESAS-ISL26104 Datasheet
1Mb / 21P
   Low-Noise 24-bit Delta Sigma ADC
logo
Intersil Corporation
ISL26104AV28EV1Z INTERSIL-ISL26104AV28EV1Z Datasheet
909Kb / 21P
   Low-Noise 24-bit Delta Sigma ADC
October 12, 2012
logo
Renesas Technology Corp
ISL26104AV28EV1Z RENESAS-ISL26104AV28EV1Z Datasheet
1Mb / 21P
   Low-Noise 24-bit Delta Sigma ADC
logo
Intersil Corporation
ISL26104AVZ INTERSIL-ISL26104AVZ Datasheet
909Kb / 21P
   Low-Noise 24-bit Delta Sigma ADC
October 12, 2012
More results

Descrição semelhante - ISL26104

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Intersil Corporation
ISL26102AVZ INTERSIL-ISL26102AVZ Datasheet
909Kb / 21P
   Low-Noise 24-bit Delta Sigma ADC
October 12, 2012
logo
Renesas Technology Corp
ISL26132 RENESAS-ISL26132 Datasheet
1Mb / 23P
   Low-Noise 24-bit Delta Sigma ADC
ISL26102 RENESAS-ISL26102 Datasheet
1Mb / 21P
   Low-Noise 24-bit Delta Sigma ADC
logo
Intersil Corporation
ISL26132AVZ INTERSIL-ISL26132AVZ Datasheet
739Kb / 23P
   Low-Noise 24-bit Delta Sigma ADC
November 20, 2014
ISL26132 INTERSIL-ISL26132 Datasheet
975Kb / 23P
   Low-Noise 24-bit Delta Sigma ADC
logo
Analog Devices
AD7731 AD-AD7731_15 Datasheet
1,008Kb / 44P
   Low Noise, High Throughput 24-Bit Sigma-Delta ADC
REV. A
AD7731BRUZ AD-AD7731BRUZ Datasheet
1,008Kb / 44P
   Low Noise, High Throughput 24-Bit Sigma-Delta ADC
REV. A
AD7731 AD-AD7731 Datasheet
411Kb / 44P
   Low Noise, High Throughput 24-Bit Sigma-Delta ADC
REV. 0
logo
List of Unclassifed Man...
PXIE-9529 ETC2-PXIE-9529 Datasheet
199Kb / 1P
   24-Bit Sigma-Delta ADC
logo
Core Technology (Shenzh...
CS1242 CHIPSEA-CS1242 Datasheet
709Kb / 29P
   24-bit Sigma-Delta ADC
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21


Folha de dados Download

Go To PDF Page


Ligação URL




Privacy Policy
ALLDATASHEETPT.COM
ALLDATASHEET é útil para você?  [ DONATE ] 

Sobre Alldatasheet   |   Publicidade   |   Contato conosco   |   Privacy Policy   |   roca de Link   |   Lista de Fabricantes
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