Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

AD7711AN Datasheet(PDF) 11 Page - Analog Devices

Part # AD7711AN
Description  LC2MOS Signal Conditioning ADC with RTD Excitation Currents
Download  28 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7711AN Datasheet(HTML) 11 Page - Analog Devices

Back Button AD7711AN Datasheet HTML 7Page - Analog Devices AD7711AN Datasheet HTML 8Page - Analog Devices AD7711AN Datasheet HTML 9Page - Analog Devices AD7711AN Datasheet HTML 10Page - Analog Devices AD7711AN Datasheet HTML 11Page - Analog Devices AD7711AN Datasheet HTML 12Page - Analog Devices AD7711AN Datasheet HTML 13Page - Analog Devices AD7711AN Datasheet HTML 14Page - Analog Devices AD7711AN Datasheet HTML 15Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 28 page
background image
2
AD7711
–11–
REV. F
Tables I and II show the output rms noise for some typical notch and –3 dB frequencies. The numbers given are for the bipolar
input ranges with a VREF of +2.5 V. These numbers are typical and are generated with an analog input voltage of 0 V. The output
noise from the part comes from two sources. The first is the electrical noise in the semiconductor devices used in the implementation
of the modulator (device noise). The second occurs when the analog input signal is converted into the digital domain adding quanti-
zation noise. The device noise is at a low level and is largely independent of frequency. The quantization noise starts at an even
lower level but rises rapidly with increasing frequency to become the dominant noise source. Consequently, lower filter notch set-
tings (below 60 Hz approximately) tend to be device noise dominated while higher notch settings are dominated by quantization
noise. Changing the filter notch and cutoff frequency in the quantization noise dominated region results in a more dramatic im-
provement in noise performance than it does in the device noise dominated region as shown in Table I. Furthermore, quantization
noise is added after the PGA, so effective resolution is independent of gain for the higher filter notch frequencies. Meanwhile, device
noise is added in the PGA and, therefore, effective resolution suffers a little at high gains for lower notch frequencies.
At the lower filter notch settings (below 60 Hz), the no missing codes performance of the device is at the 24-bit level. At the higher
settings, more codes will be missed until at 1 kHz notch setting, no missing codes performance is only guaranteed to the 12-bit level.
However, since the effective resolution of the part is 10.5 bits for this filter notch setting, this no missing codes performance should
be more than adequate for all applications.
The effective resolution of the device is defined as the ratio of the output rms noise to the input full scale. This does not remain
constant with increasing gain or with increasing bandwidth. Table II shows the same table as Table I except that the output is now
expressed in terms of effective resolution (the magnitude of the rms noise with respect to 2
× V
REF/GAIN, i.e., the input full scale). It
is possible to do post filtering on the device to improve the output data rate for a given –3 dB frequency and also to further reduce
the output noise (see Digital Filtering section).
Table I. Output Noise vs. Gain and First Notch Frequency
First Notch of
Typical Output RMS Noise ( V)
Filter and O/P –3 dB
Gain of
Gain of
Gain of
Gain of
Gain of
Gain of
Gain of
Gain of
Data Rate
1
Frequency
124816
32
64
128
10 Hz
2
2.62 Hz
1.0
0.78
0.48
0.33
0.25
0.25
0.25
0.25
25 Hz
2
6.55 Hz
1.8
1.1
0.63
0.50
0.44
0.41
0.38
0.38
30 Hz
2
7.86 Hz
2.5
1.31
0.84
0.57
0.46
0.43
0.4
0.4
50 Hz
2
13.1 Hz
4.33
2.06
1.2
0.64
0.54
0.46
0.46
0.46
60 Hz
2
15.72 Hz
5.28
2.36
1.33
0.87
0.63
0.62
0.6
0.56
100 Hz
3
26.2 Hz
13
6.4
3.7
1.8
1.1
0.9
0.65
0.65
250 Hz
3
65.5 Hz
130
75
25
12
7.5
4
2.7
1.7
500 Hz
3
131 Hz
0.6
× 103
0.26
× 103
140
70
35
25
15
8
1 kHz
3
262 Hz
3.1
× 103
1.6
× 103
0.7
× 103
0.29
× 103
180
120
70
40
NOTES
1The default condition (after the internal power-on reset) for the first notch of filter is 60 Hz.
2For these filter notch frequencies, the output rms noise is primarily dominated by device noise and as a result is independent of the value of the reference voltage.
Therefore, increasing the reference voltage will give an increase in the effective resolution of the device (i.e., the ratio of the rms noise to the input full scale is in-
creased since the output rms noise remains constant as the input full scale increases).
3For these filter notch frequencies, the output rms noise is dominated by quantization noise and as a result is proportional to the value of the reference voltage.
Table II. Effective Resolution vs. Gain and First Notch Frequency
First Notch of
Effective Resolution
1 (Bits)
Filter and O/P –3 dB
Gain of
Gain of
Gain of
Gain of
Gain of
Gain of
Gain of
Gain of
Data Rate
Frequency
124816
32
64
128
10 Hz
2.62 Hz
22.5
21.5
21.5
21
20.5
19.5
18.5
17.5
25 Hz
6.55 Hz
21.5
21
21
20
19.5
18.5
17.5
16.5
30 Hz
7.86 Hz
21
21
20.5
20
19.5
18.5
17.5
16.5
50 Hz
13.1 Hz
20
20
20
20
19
18.5
17.5
16.5
60 Hz
15.72 Hz
20
20
20
19.5
19
18
17
16
100 Hz
26.2 Hz
18.5
18.5
18.5
18.5
18
17.5
17
16
250 Hz
65.5 Hz
15
15
15.5
15.5
15.5
15.5
15
14.5
500 Hz
131 Hz
13
13
13
13
13
12.5
12.5
12.5
1 kHz
262 Hz
10.5
10.5
11
11
11
10.5
10
10
NOTE
1Effective resolution is defined as the magnitude of the output rms noise with respect to the input full scale (i.e., 2
× V
REF/GAIN). The above table applies for
a VREF of +2.5 V and resolution numbers are rounded to the nearest 0.5 LSB.


Similar Part No. - AD7711AN

ManufacturerPart #DatasheetDescription
logo
Analog Devices
AD7711AN AD-AD7711AN Datasheet
301Kb / 28P
   LC2MOS Signal Conditioning ADC with RTD Excitation Currents
REV. G
AD7711AN AD-AD7711AN Datasheet
301Kb / 28P
   LC2MOS Signal Conditioning ADC with RTD Excitation Currents
REV. G
AD7711AN AD-AD7711AN Datasheet
354Kb / 29P
   Signal Conditioning ADC
AD7711ANZ AD-AD7711ANZ Datasheet
301Kb / 28P
   LC2MOS Signal Conditioning ADC with RTD Excitation Currents
REV. G
More results

Similar Description - AD7711AN

ManufacturerPart #DatasheetDescription
logo
Analog Devices
AD7711ARZ AD-AD7711ARZ Datasheet
301Kb / 28P
   LC2MOS Signal Conditioning ADC with RTD Excitation Currents
REV. G
AD7711ANZ AD-AD7711ANZ Datasheet
301Kb / 28P
   LC2MOS Signal Conditioning ADC with RTD Excitation Currents
REV. G
AD7711A AD-AD7711A Datasheet
222Kb / 27P
   LC2MOS Signal Conditioning ADC with RTD Current Source
REV. C
AD7712 AD-AD7712 Datasheet
229Kb / 28P
   LC2MOS Signal Conditioning ADC
REV. E
AD7712 AD-AD7712_04 Datasheet
258Kb / 28P
   LC2MOS Signal Conditioning ADC
REV. F
AD7712ANZ AD-AD7712ANZ Datasheet
258Kb / 28P
   LC2MOS Signal Conditioning ADC
REV. F
AD7712ARZ AD-AD7712ARZ Datasheet
258Kb / 28P
   LC2MOS Signal Conditioning ADC
REV. F
AD7712ANZ AD-AD7712ANZ Datasheet
258Kb / 28P
   LC2MOS Signal Conditioning ADC
REV. F
AD7713ARZ AD-AD7713ARZ Datasheet
271Kb / 28P
   LC2MOS Loop-Powered Signal Conditioning ADC
REV. D
AD7713ARZ AD-AD7713ARZ Datasheet
271Kb / 28P
   LC2MOS Loop-Powered Signal Conditioning ADC
REV. D
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 22 23 24 25 26 27 28


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
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