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| 型号： | AD7623ASTZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT 1.33MSPS DFF 48LQFP |
| 标准包装： | 1 |
| 系列： | PulSAR® |
| 位数： | 16 |
| 采样率（每秒）： | 1.33M |
| 数据接口： | 串行，并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 55mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 托盘 |
| 输入数目和类型： | 1 个差分，双极 |
| 配用： | EVAL-AD7623CBZ-ND - BOARD EVALUATION FOR AD7623 |
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AD7623
Rev. 0 | Page 15 of 28
THEORY OF OPERATION
05574-021
SW+
COMP
SW–
IN+
REF
REFGND
LSB
MSB
32,768C 16,384C
4C
2C
C
SWITCHES
CONTROL
LOGIC
BUSY
OUTPUT
CODE
CNVST
IN–
32,768C 16,384C
4C
2C
C
LSB
MSB
AGND
Figure 21. ADC Simplified Schematic
CIRCUIT INFORMATION
The AD7623 is a very fast, low power, single-supply, precise,
16-bit analog-to-digital converter (ADC) using successive
approximation architecture. The AD7623 is capable of
converting 1,330,000 samples per second (1.33 MSPS).
The AD7623 provides the user with an on-chip track-and-hold,
successive approximation ADC that does not exhibit any
pipeline or latency, making it ideal for multiple multiplexed
channel applications.
The AD7623 can be operated from a single 2.5 V supply and
be interfaced to either 5 V, 3.3 V, or 2.5 V digital logic. It
is housed in 48-lead LQFP or tiny LFCSP packages that
combine space savings with flexibility, allowing the AD7623
to be configured as either a serial or parallel interface. The
AD7623 is pin-to-pin-compatible with, and a speed upgrade
of, the AD7677.
CONVERTER OPERATION
The AD7623 is a successive approximation ADC based on a
charge redistribution DAC. Figure 21 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 AGND via SW+ and SW.
All independent switches are connected to the analog inputs.
Thus, the capacitor arrays are used as sampling capacitors and
acquire the analog signal on IN+ and IN inputs. A conversion
phase is initiated once the acquisition phase is complete and the
CNVST input goes low. 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
REFGND input. Therefore, the differential voltage between the
inputs (IN+ and IN) captured at the end of the acquisition
phase is applied to the comparator inputs, causing the
comparator to become unbalanced. By switching each element
of the capacitor array between REFGND and REF, the
comparator input varies by binary weighted voltage steps
(VREF/2, VREF/4 through VREF/65536). The control logic toggles
these switches, starting with the MSB first, in order to bring the
comparator back into a balanced condition.
After the completion of this process, the control logic generates
the ADC output code and brings BUSY output low.
The AD7623 automatically powers down circuits after
conversion, making the AD7623 ideal for battery-powered
applications.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7623ASTZRL | 功能描述:IC ADC 16BIT 1.33MSPS DFF 48LQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:PulSAR® 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
| AD7623BD | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Data Acquisition |
| AD7625 | 制造商:AD 制造商全称:Analog Devices 功能描述:16-Bit, 6MSPS PulSAR Differential ADC |
| AD7625BCPZ | 功能描述:IC ADC 16BIT 6MSPS SAR 32LFCSP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:PulSAR® 其它有关文件:TSA1204 View All Specifications 标准包装:1 系列:- 位数:12 采样率（每秒）:20M 数据接口:并联 转换器数目:2 功率耗散（最大）:155mW 电压电源:模拟和数字 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-TQFP 供应商设备封装:48-TQFP（7x7） 包装:Digi-Reel® 输入数目和类型:4 个单端，单极；2 个差分，单极 产品目录页面:1156 (CN2011-ZH PDF) 其它名称:497-5435-6 |
| AD7625BCPZRL7 | 功能描述:IC ADC 16BIT 6MSPS SAR 32LFCSP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:PulSAR® 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
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