- 您现在的位置：买卖IC网 > PDF目录17045 > EVAL-AD7634EDZ (Analog Devices Inc)BOARD EVAL FOR AD7634 PDF资料下载
参数资料
| 型号： | EVAL-AD7634EDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD7634 |
| 标准包装： | 1 |
| 系列： | * |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页当前第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页
Data Sheet
AD7634
Rev. B | Page 23 of 32
capacitor with the 100 nF capacitor placed as close as possible
to the AD7634.
Power Sequencing
The AD7634 requires sequencing of the AVDD and DVDD
supplies. AVDD should come up prior to or simultaneously
with DVDD. This can be achieved using the configuration in
Figure 27 or sequencing the supplies in that manner. The
other supplies can be sequenced as desired as long as absolute
maximum ratings are observed. The AD7634 is very insensitive
to power supply variations on AVDD over a wide frequency
range, as shown in Figure 33.
30
35
40
45
50
55
60
65
70
75
1
10
100
1000
10000
0
6
406
-051
FREQUENCY (kHz)
P
SRR
(
d
B)
Figure 33. AVDD PSRR vs. Frequency
Power Dissipation vs. Throughput
In impulse mode, the AD7634 automatically reduces its power
consumption at the end of each conversion phase. During the
acquisition phase, the operating currents are very low, which allows
a significant power savings when the conversion rate is reduced
(see Figure 34). This feature makes the AD7634 ideal for very
low power, battery-operated applications.
It should be noted that the digital interface remains active even
during the acquisition phase. To reduce the operating digital supply
currents even further, drive the digital inputs close to the power
rails, that is, OVDD and OGND.
1000
1
1000000
100000
SAMPLING RATE (kSPS)
PO
W
ER
D
ISSI
PA
T
IO
N
(m
W
)
100
10
10000
1000
10
100
064
06-
0
48
IMPULSE MODE POWER
WARP MODE POWER
PDREF = PDBUF = HIGH
Figure 34. Power Dissipation vs. Sample Rate
Power Down
Setting PD = high powers down the AD7634, thus reducing
supply currents to their minimums, as shown in Figure 23.
When the ADC is in power down, the current conversion
(if any) is completed and the digital bus remains active. To
further reduce the digital supply currents, drive the inputs to
OVDD or OGND.
Power down can also be programmed with the configuration
register. See the Software Configuration section for details. Note
that when using the configuration register, the PD input is a don’t
care and should be tied to either high or low.
CONVERSION CONTROL
The AD7634 is controlled by the CNVST input. A falling edge
on CNVST is all that is necessary to initiate a conversion. A
detailed timing diagram of the conversion process is shown in
Figure 35. Once initiated, it cannot be restarted or aborted, even
by the power-down input, PD, until the conversion is complete.
The CNVST signal operates independently of CS and RD signals.
BUSY
MODE
CONVERT
ACQUIRE
CONVERT
CNVST
t1
t2
t4
t3
t5
t6
t7
t8
0
64
06
-0
33
Figure 35. Basic Conversion Timing
Although CNVST is a digital signal, it should be designed with
special care with fast, clean edges and levels with minimum
overshoot, undershoot, or ringing.
The CNVST trace should be shielded with ground and a low value
(such as 50 Ω) serial resistor termination should be added close
to the output of the component that drives this line.
For applications where SNR is critical, the CNVST signal should
have very low jitter. This can be achieved by using a dedicated
oscillator for CNVST generation, or by clocking CNVST with a
high frequency, low jitter clock, as shown in Figure 27.
相关PDF资料 |
PDF描述 |
|---|---|
| VE-BWP-EY | CONVERTER MOD DC/DC 13.8V 50W |
| STD01W-P | WIRE & CABLE MARKERS |
| VE-BWN-EY | CONVERTER MOD DC/DC 18.5V 50W |
| VE-BWM-EY | CONVERTER MOD DC/DC 10V 50W |
| STD01W-Z | WIRE & CABLE MARKERS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-AD7641CB | 制造商:Analog Devices 功能描述:EVAL FOR AD7641CB - Bulk |
| EVAL-AD7641CB1 | 制造商:AD 制造商全称:Analog Devices 功能描述:18-Bit, 2 MSPS SAR ADC |
| EVAL-AD7641CBZ | 功能描述:BOARD EVALUATION FOR AD7641 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:PulSAR® 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| EVAL-AD7641EDZ | 功能描述:BOARD EVAL FOR AD7641 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| EVAL-AD7643CB | 制造商:Analog Devices 功能描述:EVAL BD FOR AD7643 - Bulk |
发布紧急采购，3分钟左右您将得到回复。