- 您现在的位置：买卖IC网 > PDF目录17044 > EVAL-AD7988-5SDZ (Analog Devices Inc)BAORD EVAL FOR AD7988-5 PDF资料下载
参数资料
| 型号： | EVAL-AD7988-5SDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/24页 |
| 文件大小： | 0K |
| 描述： | BAORD EVAL FOR AD7988-5 |
| 标准包装： | 1 |
| 系列： | PulSAR® |
| ADC 的数量： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 500k |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 输入范围： | 0 ~ VREF |
| 在以下条件下的电源（标准）： | 3.5mW @ 500kSPS |
| 工作温度： | -40°C ~ 125°C |
| 已用 IC / 零件： | AD7988-5 |
| 已供物品： | 板 |
AD7988-1/AD7988-5
Data Sheet
Rev. D | Page 14 of 24
THEORY OF OPERATION
COMP
SWITCHES CONTROL
BUSY
OUTPUT CODE
CNV
CONTROL
LOGIC
SW+
LSB
SW–
LSB
IN+
REF
GND
IN–
MSB
C
4C
2C
16,384C
32,768C
C
4C
2C
16,384C
32,768C
10231-
030
Figure 29. ADC Simplified Schematic
CIRCUIT INFORMATION
The AD7988-1/AD7988-5 devices are fast, low power, single-
supply, precise 16-bit ADCs that use a successive approximation
architecture.
The AD7988-1 is capable of converting 100,000 samples per
second (100 kSPS), whereas the AD7988-5 is capable of a
throughput of 500 kSPS, and they power down between
conversions. When operating at 10 kSPS, for example, the
ADC consumes 70 W typically, ideal for battery-powered
applications.
The AD7988-x provides the user with on-chip track-and-hold
and does not exhibit any pipeline delay or latency, making it
ideal for multiple multiplexed channel applications.
The AD7988-x can be interfaced to any 1.8 V to 5 V digital logic
family. It is housed in a 10-lead MSOP or a tiny 10-lead LFCSP
(QFN) that combines space savings and allows flexible
configurations.
CONVERTER OPERATION
The AD7988-x is a successive approximation ADC based on a
charge redistribution DAC. Figure 29 shows the simplified
schematic of the ADC. The capacitive DAC consists of two
identical arrays of 16 binary weighted capacitors, which are
connected to the two comparator inputs.
During the acquisition phase, terminals of the array tied to the
comparator’s input are connected to GND via SW+ and SW.
All independent switches are connected to the analog inputs.
Therefore, the capacitor arrays are used as sampling capacitors
and acquire the analog signal on the IN+ and IN inputs. When
the acquisition phase is completed and the CNV input goes high, a
conversion phase is initiated. When the conversion phase begins,
SW+ and SW are opened first. The two capacitor arrays are then
disconnected from the inputs and connected to the GND input.
Therefore, the differential voltage between the IN+ and IN
inputs captured at the end of the acquisition phase are applied
to the comparator inputs, causing the comparator to become
unbalanced. By switching each element of the capacitor array
between GND and REF, the comparator input varies by binary
weighted voltage steps (VREF/2, VREF/4 … VREF/65,536). The
control logic toggles these switches, starting with the MSB, to
bring the comparator back into a balanced condition. After the
completion of this process, the part returns to the acquisition phase
and the control logic generates the ADC output code.
Because the AD7988-x has an on-board conversion clock, the
serial clock, SCK, is not required for the conversion process.
相关PDF资料 |
PDF描述 |
|---|---|
| EVAL-AD7687SDZ | BOARD EVAL FOR AD7687 |
| RCM08DRAI | CONN EDGECARD 16POS R/A .156 SLD |
| MIC2076A-1YM | IC SW DISTRIBUTION 2CH 8SOIC |
| 0210490301 | CABLE JUMPER 1.25MM .051M 24POS |
| LGU2G560MELY | CAP ALUM 56UF 400V 20% SNAP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-AD7991EBZ | 功能描述:BOARD EVAL FOR AD7991 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-AD7991EBZ | 制造商:Analog Devices 功能描述:AD7991, ADC, I2C, EVALUATION BOARD |
| EVAL-AD7992CB | 制造商:AD 制造商全称:Analog Devices 功能描述:2-Channel, 12-Bit ADC with I2C-Compatible |
| EVAL-AD7992EBZ | 功能描述:BOARD EVALUATION FOR AD7992 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-AD7993CB | 制造商:Analog Devices 功能描述:EVALUATION CONTROL BOARD. - Bulk |
发布紧急采购，3分钟左右您将得到回复。