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| 型号： | AD7982BRMZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 4/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT 1MSPS PULSAR 10MSOP |
| 产品培训模块： | Motor Control |
| 设计资源： | Converting a Single-Ended Signal with AD7982 Differential PulSAR ADC (CN0032) Precision Single-Supply Differential ADC Driver for Industrial-Level Signals (CN0180) |
| 标准包装： | 1 |
| 系列： | PulSAR® |
| 位数： | 18 |
| 采样率（每秒）： | 1M |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 8.6mW |
| 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 管件 |
| 输入数目和类型： | 1 个差分，单极 |
| 产品目录页面： | 780 (CN2011-ZH PDF) |
AD7982
Data Sheet
Rev. B | Page 12 of 24
THEORY OF OPERATION
COMP
CONTROL
LOGIC
SWITCHES CONTROL
BUSY
OUTPUT CODE
CNV
C
2C
65,536C
4C
131,072C
LSB
SW+
MSB
LSB
SW–
MSB
C
2C
65,536C
4C
131,072C
IN+
REF
GND
IN–
06513-
0
1
Figure 21. ADC Simplified Schematic
CIRCUIT INFORMATION
The AD7982 is a fast, low power, single-supply, precise, 18-bit
ADC using a successive approximation architecture.
The AD7982 is capable of converting 1,000,000 samples per
second (1 MSPS) and powers down between conversions. When
operating at 10 kSPS, for example, it typically consumes 70 W,
making it ideal for battery-powered applications.
The AD7982 provides the user with an on-chip track-and-hold
and does not exhibit any pipeline delay or latency, making it
ideal for multiple multiplexed channel applications.
The AD7982 can be interfaced to any 1.8 V to 5 V digital logic
family. It is available in a 10-lead MSOP or a tiny 10-lead QFN
(LFCSP) that allows space savings and flexible configurations.
It is pin-for-pin-compatible with the 16-bit AD7980.
CONVERTER OPERATION
The AD7982 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 18 binary-weighted capacitors, which are
connected to the two comparator inputs.
During the acquisition phase, terminals of the array tied to the
input of the comparator 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 complete 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 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 GND and REF, the
comparator input varies by binary-weighted voltage steps
(VREF/2, VREF/4 ... VREF/262,144). 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 and a busy signal indicator.
Because the AD7982 has an on-board conversion clock, the
serial clock, SCK, is not required for the conversion process.
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| AD7982BRMZRL7 | 功能描述:IC ADC 18BIT 7.0MW 1MSPS 10-MSOP 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 |
| AD7983 | 制造商:AD 制造商全称:Analog Devices 功能描述:16-Bit, 1.33 MSPS PulSAR ADC in MSOP/QFN |
| AD79831 | 制造商:AD 制造商全称:Analog Devices 功能描述:18-Bit, 2 MSPS PulSAR 15 mW ADC in LFCSP (QFN) |
| AD7983BCPZ-R2 | 功能描述:IC ADC 16BIT 1.33MSPS 10LFCSP 制造商:analog devices inc. 系列:* 包装:带卷（TR） 零件状态:Digi-Key 停止供應 封装/外壳:10-WFDFN 裸露焊盘，CSP 供应商器件封装:10-LFCSP-WD（3x3） 标准包装:250 |
| AD7983BCPZ-RL | 功能描述:IC ADC 16BIT 1.33MSPS 10LFCSP 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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