参数资料
型号: EVAL-AD7949EDZ
厂商: Analog Devices Inc
文件页数: 14/32页
文件大小: 0K
描述: BOARD EVAL AD7949
标准包装: 1
系列: PulSAR®
ADC 的数量: 1
位数: 14
采样率(每秒): 250k
数据接口: 串行
输入范围: ±VREF
在以下条件下的电源(标准): 10.8mW @ 250kSPS,5V
工作温度: -40°C ~ 85°C
已用 IC / 零件: AD7949
已供物品:
Data Sheet
AD7949
Rev. D | Page 21 of 32
POWER SUPPLY
The AD7949 uses two power supply pins: an analog and digital
core supply (VDD) and a digital input/output interface 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 AD7949 is independent of power
supply sequencing between VIO and VDD. Additionally, it is
very insensitive to power supply variations over a wide
frequency range, as shown in Figure 33.
75
70
65
60
55
50
45
40
35
30
1
10k
10
P
SSR
(
d
B
)
100
1k
FREQUENCY (kHz)
07
35
1-
0
33
Figure 33. PSRR vs. Frequency
The AD7949 powers 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)
VDD = 5V, INTERNAL REF
VDD = 5V, EXTERNAL REF
VDD = 2.5V, EXTERNAL REF
VIO
0
73
51
-03
4
Figure 34. Operating Currents vs. Sampling Rate
SUPPLYING THE ADC FROM THE REFERENCE
For simplified applications, the AD7949, with its low operating
current, can be supplied directly using an external reference
circuit like the one shown in Figure 35. The reference line can
be driven by:
The system power supply directly
A reference voltage with enough current output capability,
such as the ADR43x or ADR44x
A reference buffer, such as the AD8605, which can also
filter the system power supply, as shown in Figure 35
AD8605
AD7949
VIO
REF
VDD
10F
1F
0.1F
10
10k
5V
1F
1
1OPTIONAL REFERENCE BUFFER AND FILTER.
0.1F
073
51
-03
5
Figure 35. Example of an Application Circuit
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