參數(shù)資料
型號： AD7689BCPZRL7
廠商： Analog Devices Inc
文件頁數(shù)： 16/32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
Data Sheet
AD7682/AD7689
Rev. D | Page 23 of 32
POWER SUPPLY
SUPPLYING THE ADC FROM THE REFERENCE
The AD7682/AD7689 use two power supply pins: an analog
and digital core supply (VDD) and a digital input/output inter-
face supply (VIO). VIO allows direct interface with any logic
between 1.8 V and VDD. To reduce the supplies needed, the
VIO and VDD pins can be tied together. The AD7682/AD7689
are independent of power supply sequencing between VIO and
VDD. Additionally, it is very insensitive to power supply varia-
tions over a wide frequency range, as shown in Figure 34.
For simplified applications, the AD7682/AD7689, with their
low operating current, can be supplied directly using an
external reference circuit like the one shown in Figure 36. The
reference line can be driven by:
The system power supply directly
A reference voltage with enough current output capability,
such as the ADR43x/ADR44x
A reference buffer, such as the AD8605, which can also
filter the system power supply, as shown in Figure 36
75
70
65
60
55
50
45
40
35
30
1
10k
10
PS
SR
(
d
B
)
100
1k
FREQUENCY (kHz)
07
35
3-
03
4
AD8605
AD7689
VIO
REF
VDD
10F
1F
0.1F
10
10k
5V
1F
1
1OPTIONAL REFERENCE BUFFER AND FILTER.
0.1F
0
73
53
-03
5
Figure 36. Example of an Application Circuit
Figure 34. PSRR vs. Frequency
The AD7682/AD7689 power down automatically at the end of
each conversion phase; therefore, the operating currents and
power scale linearly with the sampling rate. This makes the part
ideal for low sampling rates (even of a few hertz) and low
battery-powered applications.
10,000
1000
100
10
1
0.1
0.010
0.001
10
1M
100
O
P
E
RAT
IN
G
CU
RRE
N
T
(
A
)
1k
10k
100k
SAMPLING RATE (SPS)
0
73
53
-04
0
VDD = 5V, INTERNAL REF
VDD = 5V, EXTERNAL REF
VDD = 2.5V, EXTERNAL REF
VIO
Figure 35. Operating Currents vs. Sampling Rate
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