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参数资料
| 型号： | EVAL-AD7938CBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 22/36页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR AD7938 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 1.5M |
| 数据接口： | 并联 |
| 输入范围： | ±VREF |
| 在以下条件下的电源（标准）： | 13.5mW @ 5V |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7938 |
| 已供物品： | 板，CD |
| 相关产品： | AD7938BSUZ-6REEL7DKR-ND - IC ADC 12BIT 8CHAN 32TQFP AD7938BSUZ-6REEL7CT-ND - IC ADC 12BIT 8CHAN 32TQFP AD7938BCPZ-6-ND - IC ADC 12BIT 8CH 625KSPS 32LFCSP AD7938BSUZ-ND - IC ADC 12BIT 8CHAN 32TQFP AD7938BSUZ-6-ND - IC ADC 12BIT 8CHAN 32TQFP AD7938BCPZ-ND - IC ADC 12BIT 8CH 1.5MSPS 32LFCSP AD7938BCPZ-REEL7-ND - IC ADC 12BIT 8CH 1.5MSPS 32LFCSP AD7938BCPZ-6REEL7-ND - IC ADC 12BIT 8CH 625KSPS 32LFCSP AD7938BSUZ-6REEL7TR-ND - IC ADC 12BIT 8CHAN 32TQFP AD7938BSUZ-REEL7-ND - IC ADC 12BIT 8CHAN 32TQFP |
| 其它名称： | Q3627458 |
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Data Sheet
AD7938/AD7939
Rev. C | Page 29 of 36
POWER vs. THROUGHPUT RATE
A considerable advantage of powering the ADC down after a
conversion is that the power consumption of the part is
significantly reduced at lower throughput rates. When using the
different power modes, the AD7938/AD7939 are only powered
up for the duration of the conversion. Therefore, the average
power consumption per cycle is significantly reduced. Figure 41
shows a plot of the power vs. throughput rate when operating in
autostandby mode for both VDD = 5 V and 3 V. For example, if
the maximum CLKIN frequency of 25.5 MHz is used to
minimize the conversion time, this accounts for only 0.525 s of
the overall cycle time while the AD7938/AD7939 remains in
standby mode for the remainder of the cycle. If the devices run
at a throughput rate of 10 kSPS, for example, the overall cycle
time is 100 s.
Figure 42 shows a plot of the power vs. throughput rate when
operating in normal mode for both VDD = 5 V and VDD = 3 V. In
both plots, the figures apply when using the internal reference.
If an external reference is used, the power-up time reduces to
600 ns; therefore, the AD7938/AD7939 remain in standby for a
greater time in every cycle. Additionally, the current consumption,
when converting, should be lower than the specified maximum
of 2.7 mA with VDD = 5 V, or 2.0 mA with VDD = 3 V.
THROUGHPUT (kSPS)
PO
W
ER
(m
W
)
1.8
0.8
1.0
1.2
1.4
1.6
0
0.6
0.4
0.2
0
20
40
60
80
100
120
140
03715-
042
TA = 25°C
VDD = 5V
VDD = 3V
Figure 41. Power vs. Throughput in
Autostandby Mode Using Internal Reference
THROUGHPUT (kSPS)
PO
W
ER
(m
W
)
10
4
5
6
7
8
9
0
3
2
1
0
200
400
600
800
1000
1200
1600
1400
03715-
043
TA = 25°C
VDD = 5V
VDD = 3V
Figure 42. Power vs. Throughput in Normal Mode Using Internal Reference
MICROPROCESSOR INTERFACING
AD7938/AD7939 to ADSP-21xx Interface
Figure 43 shows the AD7938/AD7939 interfaced to the ADSP-
21xx series of DSPs as a memory-mapped device. A single wait
state may be necessary to interface the AD7938/AD7939 to the
ADSP-21xx depending on the clock speed of the DSP. The wait
state can be programmed via the data memory wait state
control register of the ADSP-21xx (see the ADSP-21xx family
User’s Manual for details). The following instruction reads from
the AD7938/AD7939:
MR = DM (ADC)
where ADC is the address of the AD7938/AD7939.
AD7938/
AD7939*
ADSP-21xx*
WR
RD
DB0 TO DB11
D0 TO D23
A0 TO A15
DMS
IRQ2
BUSY
CS
CONVST
DSP/USER SYSTEM
WR
RD
*ADDITIONAL PINS OMITTED FOR CLARITY.
ADDRESS BUS
DATA BUS
ADDRESS
DECODER
03715-
045
Figure 43. Interfacing to the ADSP-21xx
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-AD7939CB | 制造商:Analog Devices 功能描述:EVALUATION CONTROL BOARD I.C. - Bulk |
| EVAL-AD7939CBZ | 功能描述:BOARD EVALUATION FOR AD7939CBZ 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-AD7940CB | 制造商:AD 制造商全称:Analog Devices 功能描述:3mW, 100kSPS, 14-Bit ADC in 6-Lead SOT-23 |
| EVAL-AD7940CBZ | 功能描述:BOARD EVALUATION AD7940 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-AD7942CB | 功能描述:BOARD EVALUATION FOR AD7942 RoHS:否 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 |
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