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参数资料
| 型号： | AD7787BRM |
| 厂商： | Analog Devices Inc |
| 文件页数： | 4/20页 |
| 文件大小： | 0K |
| 描述： | IC ADC 24BIT LP 2CH SIG 10-MSOP |
| 标准包装： | 50 |
| 位数： | 24 |
| 采样率（每秒）： | 120 |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 225µW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 105°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 个单端，单极；1 个单端，双极；1 个差分，单极；1 个差分，双极 |
AD7787
Data Sheet
Rev. A | Page 12 of 20
MODE REGISTER (RS1, RS0 = 0, 1; POWER-ON/RESET = 0×02)
The mode register is an 8-bit register from which data can be read or to which data can be written. This register is used to configure the
ADC for unipolar or bipolar mode, to enable or disable the buffer, or to place the device into power-down mode. Table 9 outlines the bit
designations for the mode register. MR0 through MR7 indicate the bit locations, MR denoting the bits are in the mode register. MR7
denotes the first bit of the data stream. The number in the parenthesis indicates the power-on/reset default status of that bit. Any write to
the setup register resets the modulator and filter and sets the RDY bit.
MR7
MR6
MR5
MR4
MR3
MR2
MR1
MR0
MD1 (0)
MD0 (0)
0 (0)
BO (0)
U/B (0)
BUF (1)
0 (0)
Table 9. Mode Register Bit Designations
Bit
Location
Bit
Name
Description
MR7 to
MR6
MD1 to
MD0
Mode Select Bits. These bits select between continuous conversion mode, single conversion mode, and standby
mode. In continuous conversion mode, the ADC continuously performs conversions and places the result in the
data register. RDY goes low when a conversion is complete. The user can read these conversions by placing the
device in continuous read mode whereby the conversions are automatically placed on the DOUT line when SCLK
pulses are applied. Alternatively, the user can instruct the ADC to output the conversion by writing to the
communications register. After power-on, the first conversion is available after a period 2/fADC while subsequent
conversions are available at a frequency of fADC. In single conversion mode, the ADC is placed in power-down mode
when conversions are not being performed. When single conversion mode is selected, the ADC powers up and
performs a single conversion, which occurs after a period 2/fADC. The conversion result is placed in the data register,
RDY goes low, and the ADC returns to power-down mode. The conversion remains in the data register and RDY
remains active (low) until the data is read or another conversion is performed (see Table 10).
MR5 to
MR4
0
These bits must be programmed with a Logic 0 for correct operation.
MR3
BO
Burnout Current Enable Bit. When this bit is set to 1 by the user, the 100 nA current sources in the signal path are
enabled. When BO = 0, the burnout currents are disabled. The burnout currents can be enabled only when the
buffer is active.
MR2
U/B
Unipolar/Bipolar Bit. Set by user to enable unipolar coding, i.e., zero differential input results in 0x000000 output and
a full-scale differential input results in 0xFFFFFF output. Cleared by the user to enable bipolar coding. Negative full-
scale differential input results in an output code of 0x000000, zero differential input results in an output code of
0x800000, and a positive full-scale differential input will result in an output code of 0xFFFFFF.
MR1
BUF
Configures the AD7787 for buffered or unbuffered mode of operation. If cleared, the ADC operates in unbuffered
mode, lowering the power consumption of the device. If set, the device operates in buffered mode, allowing the
user to place source impedances on the front end without contributing gain errors to the system.
MR0
0
This bit must be programmed with a Logic 0 for correct operation.
Table 10. Operating Modes
MD1
MD0
Mode
0
Continuous Conversion Mode (Default)
0
1
Reserved
1
0
Single Conversion Mode
1
Power-Down Mode
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7787BRM-REEL | 功能描述:IC ADC 24BIT LP 2CH SIG 10-MSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| AD7787BRMZ | 功能描述:IC ADC 24BIT 2CH LP SIG 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:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| AD7787BRMZ | 制造商:Analog Devices 功能描述:IC 24BIT ADC SMD 7787 MSOP10 |
| AD7787BRMZ-RL | 功能描述:IC ADC 24BIT 2CH LP SIG 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:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| AD7788 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Power, 16-/24-Bit Sigma-Delta ADC |
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