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參數(shù)資料
| 型號： | AD7711AR-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 2/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 24BIT RTD I SOURCE 24SOIC |
| 標(biāo)準(zhǔn)包裝： | 400 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 1.03k |
| 數(shù)據(jù)接口： | 串行 |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 52.5mW |
| 電壓電源： | 模擬和數(shù)字，雙 ± |
| 工作溫度： | -40°C ~ 80°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-SOIC W |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個單端，單極；1 個單端，雙極；1 個差分，單極；1 個差分，雙極 |
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REV. G
–10–
AD7711
PGA Gain
G2
Gl
G0
Gain
000
1(Default Condition after the Internal Power-On Reset)
001
2
010
4
011
8
100
16
101
32
110
64
111
128
CHANNEL SELECTION
CH
Channel
0
AIN1
(Default Condition after Internal Power-On Reset)
1
AIN2
Power-Down
PD
0Normal Operation
(Default Condition after Internal Power-On Reset)
1
Power-Down
Word Length
WL
Output Word Length
0
16-bit
(Default Condition after Internal Power-On Reset)
1
24-bit
RTD Excitation Current
IO
0Off
(Default Condition after Internal Power-On Reset)
1On
Burnout Current
BO
0Off
(Default Condition after Internal Power-On Reset)
1On
Bipolar/Unipolar Selection (Both Inputs)
B/U
0
Bipolar
(Default Condition after Internal Power-On Reset)
1
Unipolar
FILTER SELECTION (FS11–FS0)
The on-chip digital filter provides a sinc
3(or (sinx/x)3) filter
response. The 12 bits of data programmed into these bits deter-
mine the filter cutoff frequency, the position of the first notch of
the filter and the data rate for the part. In association with the
gain selection, it also determines the output noise (and therefore
the effective resolution) of the device.
The first notch of the filter occurs at a frequency determined by
the relationship: filter first notch frequency = (fCLK IN/512)/code
where code is the decimal equivalent of the code in bits FS0 to
FS11 and is in the range 19 to 2,000. With the nominal fCLK IN
of 10 MHz, this results in a first notch frequency range from
9.76 Hz to 1.028 kHz. To ensure correct operation of the
AD7711, the value of the code loaded to these bits must be
within this range. Failure to do this will result in unspecified
operation of the device.
Changing the filter notch frequency, as well as the selected gain,
impacts resolution. Tables I and II and Figure 2 show the effect
of the filter notch frequency and gain on the effective resolution
of the AD7711. The output data rate (or effective conversion
time) for the device is equal to the frequency selected for the
first notch of the filter. For example, if the first notch of the
filter is selected at 50 Hz, a new word is available at a 50 Hz rate
or every 20 ms. If the first notch is at 1 kHz, a new word is avail-
able every 1 ms.
The settling time of the filter to a full-scale step input change
is worst case 4
1/(output data rate). This settling time is to
100% of the final value. For example, with the first filter notch
at 50 Hz, the settling time of the filter to a full-scale step input
change is 80 ms max. If the first notch is at 1 kHz, the settling
time of the filter to a full-scale input step is 4 ms max. This
settling time can be reduced to 3
1/(output data rate) by syn-
chronizing the step input change to a reset of the digital filter. In
other words, if the step input takes place with
SYNC low, the
settling time is 3
1/(output data rate). If a change of channels
takes place, the settling time is 3
1/(output data rate) regard-
less of the
SYNC input.
The –3 dB frequency is determined by the programmed first
notch frequency according to the relationship:
filter –3 dB frequency = 0.262
first notch frequency.
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