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参数资料
| 型号： | AD7992BRMZ-0REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/29页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 2CHAN I2C 10MSOP |
| 标准包装： | 3,000 |
| 位数： | 12 |
| 采样率（每秒）： | 79k |
| 数据接口： | I²C，串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 2.2mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 125°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： | 带卷 (TR) |
| 输入数目和类型： | 2 个单端，单极 |
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AD7992
Rev. 0 | Page 13 of 28
CIRCUIT INFORMATION
The AD7992 is a low power, 12-bit, single-supply, 2-channel
analog-to-digital converter (ADC). The part can be operated
from a 2.7 V to 5.5 V supply.
The AD7992 provides the user with a 2-channel multiplexer,
an on-chip track-and-hold, an ADC, an on-chip oscillator,
internal data registers, and an I2C-compatible serial interface,
all housed in a 10-lead MSOP package that offers the user
considerable space-saving advantages over alternative solutions.
The AD7992 requires an external reference in the range of 1.2 V
to VDD.
The AD7992 normally remains in a power-down state while not
converting. When supplies are first applied, the part comes up
in a power-down state. Power-up is initiated prior to a con-
version, and the device returns to power-down upon
completion of the conversion. Conversions can be initiated on
the AD7992 by pulsing the CONVST signal, using an automatic
cycle interval mode or a command mode where wake-up and a
conversion occur during a write address function (see the
Modes of Operation section). On completion of a conversion,
the AD7992 again enters power-down mode. This automatic
power-down feature allows power saving between conversions.
This means any read or write operations across the I2C interface
can occur while the device is in power-down.
CONVERTER OPERATION
The AD7992 is a successive approximation, analog-to-digital
converter based around a capacitive DAC. Figure 17 and
Figure 18 show simplified schematics of the ADC during its
acquisition and conversion phases, respectively. Figure 17 shows
the ADC during its acquisition phase. SW2 is closed and SW1 is
in position A, the comparator is held in a balanced condition,
and the sampling capacitor acquires the signal on VIN.
CAPACITIVE
DAC
VIN
COMPARATOR
CONTROL
LOGIC
SW1
A
B
SW2
AGND
03473-0-018
Figure 17. ADC Acquisition Phase
When the ADC starts a conversion, as shown in Figure 18,
SW2 opens and SW1 moves to position B, causing the
comparator to become unbalanced. The input is disconnected
once the conversion begins. The control logic and the capacitive
DAC are used to add and subtract fixed amounts of charge from
the sampling capacitor to bring the comparator back into a
balanced condition. When the comparator is rebalanced, the
conversion is complete. The control logic generates the ADC
output code. Figure 19 shows the ADC transfer function.
VIN
COMPARATOR
CONTROL
LOGIC
SW1
A
B
SW2
AGND
CAPACITIVE
DAC
03473-0-019
Figure 18. ADC Conversion Phase
ADC Transfer Function
The output coding of the AD7992 is straight binary. The
designed code transitions occur at successive integer LSB values
(i.e., 1 LSB, 2 LSB, and so on). The LSB size for the AD7992 is
the AD7992.
000...000
ADC
CODE
ANALOG INPUT
0V TO REFIN
111...111
000...001
000...010
111...110
111...000
011...111
AGND + 1LSB
+REFIN – 1LSB
AD7992 1LSB = REFIN/4096
03263-0-003
Figure 19. AD7992 Transfer Characteristic
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7992BRMZ-1 | 功能描述:IC ADC 12BIT 2CHAN I2C 10-MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
| AD7992BRMZ-1-R2 | 制造商:Analog Devices 功能描述: |
| AD7992BRMZ-1REEL | 功能描述:IC ADC 12BIT 2CHAN I2C 10MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 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:38-WFQFN 裸露焊盘 供应商设备封装:38-QFN（5x7） 包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| AD7993 | 制造商:AD 制造商全称:Analog Devices 功能描述:4-Channel, 12-/10-Bit ADCs with I2C Compatible Interface in 16-Lead TSSOP |
| AD7993-0 | 制造商:AD 制造商全称:Analog Devices 功能描述:4-Channel, 10- and 12-Bit ADCs with I2C Compatible Interface in 16-Lead TSSOP |
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