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| 型號： | AD7689BCPZRL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 11/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 16BIT 250KSPS 8CH 20LFCSP |
| 產(chǎn)品培訓(xùn)模塊： | Power Line Monitoring Motor Control |
| 產(chǎn)品變化通告： | Startup Circuitry Design Improvement Change 15/April/2009 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | PulSAR® |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 250k |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 21mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 20-LFCSP-VQ |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 輸入數(shù)目和類型： | 8 個單端，單極；4 個差分，雙極；4 個偽差分，雙極 |
| 其它名稱： | AD7689BCPZRL7DKR |
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Data Sheet
AD7682/AD7689
Rev. D | Page 19 of 32
Unipolar or Bipolar
Figure 26 shows an example of the recommended connection
available.
Bipolar Single Supply
Figure 27 shows an example of a system with a bipolar input
using single supplies with the internal reference (optional
different VIO supply). This circuit is also useful when the
amplifier/signal conditioning circuit is remotely located with
some common mode present. Note that for any input config-
uration, the INx inputs are unipolar and are always referenced
to GND (no negative voltages even in bipolar range).
For this circuit, a rail-to-rail input/output amplifier can be used;
however, the offset voltage vs. input common-mode range should
be noted and taken into consideration (1 LSB = 62.5 μV with
VREF = 4.096 V). Note that the conversion results are in twos
complement format when using the bipolar input configuration.
Refer to the AN-581 Application Note, Biasing and Decoupling
Op Amps in Single Supply Applications, for additional details
about using single-supply amplifiers.
ANALOG INPUTS
Input Structure
Figure 28 shows an equivalent circuit of the input structure of
protection for the analog inputs, IN[7:0] and COM. Care must
be taken to ensure that the analog input signal does not exceed
the supply rails by more than 0.3 V because this causes the
diodes to become forward biased and to start conducting
current.
These diodes can handle a forward-biased current of 130 mA
maximum. For instance, these conditions may eventually occur
when the input buffer supplies are different from VDD. In such
a case, for example, an input buffer with a short circuit, the
current limitation can be used to protect the part.
CIN
RIN
D1
D2
CPIN
INx+
OR INx–
OR COM
GND
VDD
07
35
3-
0
3
0
Figure 28. Equivalent Analog Input Circuit
This analog input structure allows the sampling of the true
differential signal between INx+ and COM or INx+ and INx.
(COM or INx = GND ± 0.1 V or VREF ± 0.1 V). By using these
differential inputs, signals common to both inputs are rejected,
as shown in Figure 29.
70
65
60
55
50
45
40
35
30
1
10k
10
CM
RR
(
d
B)
100
1k
FREQUENCY (kHz)
07
35
3-
03
1
Figure 29. Analog Input CMRR vs. Frequency
During the acquisition phase, the impedance of the analog inputs
can be modeled as a parallel combination of the capacitor, CPIN,
and the network formed by the series connection of RIN and CIN.
CPIN is primarily the pin capacitance. RIN is typically 2.2 kΩ and
is a lumped component composed of serial resistors and the on
resistance of the switches. CIN is typically 27 pF and is mainly
the ADC sampling capacitor.
Selectable Low-Pass Filter
During the conversion phase, where the switches are opened,
filter that reduces undesirable aliasing effects and limits the
noise from the driving circuitry. The low-pass filter can be pro-
grammed for the full bandwidth or of the bandwidth with
Note that the converter throughput must also be reduced by
when using the filter. If the maximum throughput is used with the
bandwidth (BW) set to , the converter acquisition time, tACQ, is
violated, resulting in increased THD.
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| AD768AR | 功能描述:IC DAC 16BIT 30MSPS 28-SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1,000 系列:- 設(shè)置時間:1µs 位數(shù):8 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:8 電壓電源:雙 ± 功率耗散（最大）:941mW 工作溫度:0°C ~ 70°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) 輸出數(shù)目和類型:8 電壓，單極 采樣率（每秒）:* |
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