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参数资料
| 型号： | AD7949BCPZRL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/32页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT 250KSPS 8CH 20LFCSP |
| 产品培训模块： | Power Line Monitoring |
| 产品变化通告： | Startup Circuitry Design Improvement Change 15/April/2009 |
| 标准包装： | 1,500 |
| 系列： | PulSAR® |
| 位数： | 14 |
| 采样率（每秒）： | 250k |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 15.5mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 20-LFCSP-VQ |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | * |
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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,
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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