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参数资料
| 型号： | AD7739 |
| 厂商： | Analog Devices, Inc. |
| 元件分类： | ADC |
| 英文描述： | 8-Channel, High Throughput, 24-Bit Sigma-Delta ADC |
| 中文描述： | 8通道，高吞吐量，24位Σ-Δ模数转换器 |
| 文件页数： | 20/32页 |
| 文件大小： | 380K |
| 代理商： | AD7739 |
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AD7739
CHANNEL CONVERSION TIME REGISTERS
8 Bits, Read/Write Registers, Address 0x30–0x37h, Default Value 0x91
Rev. 0 | Page 20 of 32
The conversion time registers enable or disable chopping and configure the digital filter for a particular channel. This register value affects
the conversion time, frequency response, and noise performance of the ADC.
Bit
Mnemonic
Default
Bit 7
CHOP
1
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
FW (7-Bit Filter Word)
0x11
Bit
7
6–0
Mnemonic
CHOP
FW
Description
Chopping Enable Bit. Set to 1 to apply chopping mode for a particular channel.
CHOP = 1, single conversion or continuous conversion with one channel enabled.
Conversion Time (μs) = (FW × 128 + 262)/MCLK Frequency (MHz), the FW range is 2 to 127.
CHOP = 1, continuous conversion with two or more channels enabled.
Conversion Time (μs) = (FW × 128 + 263)/MCLK Frequency (MHz), the FW range is 2 to 127.
CHOP = 0, single conversion or continuous conversion with one channel enabled.
Conversion Time (μs) = (FW × 64 + 213)/MCLK Frequency (MHz), the FW range is 3 to 127.
CHOP = 0, continuous conversion with two or more channels enabled.
Conversion Time (μs) = (FW × 64 + 214)/MCLK Frequency (MHz), the FW range is 3 to 127.
MODE REGISTER
8 Bits, Read/Write Register, Address 0x38–0x3F, Default Value 0x00
The mode register configures the part and determines its operating mode. Writing to the mode register clears the ADC status register, sets
the RDY pin to a logic high level, exits all current operations, and starts the mode specified by the mode bits.
The AD7739 contains only one mode register. The two LSBs of the address are used for writing to the mode register to specify the channel
selected for the operation determined by the MD2 to MD0 bits. Only the address 0x38 must be used for reading from the mode register.
Bit
Mnemonic
Default
Bit 7
MD2
0
Bit 6
MD1
0
Bit 5
MD0
0
Bit 4
CLKDIS
0
Bit 3
DUMP
0
Bit 2
Cont RD
0
Bit 1
24/16 BIT
0
Bit 0
CLAMP
0
Bit
7–5
Mnemonic
MD2–MD0
Description
Mode Bits. These three bits determine the AD7739 operation mode. Writing a new value to the mode bits will
exit the part from the mode in which it has been operating and place it in the newly requested mode
immediately. The function of the mode bits is described in more detail below.
MD2
MD1
MD0
Mode
Address Used for Mode Register
Write Specifies:
First Channel to Start Converting
Channel to Convert
Conversion Time for Calibration
Conversion Time for Calibration
Channel to Calibrate
Channel to Calibrate
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Idle
Continuous Conversion
Single Conversion
Power-Down (Standby)
ADC Zero-Scale Self-Calibration
ADC Full-Scale Self-Calibration (for 2.5 V)
Channel Zero-Scale System Calibration
Channel Full-Scale System Calibration
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| AD7739BRU | 功能描述:IC ADC 24BIT 8-CH 24-TSSOP 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:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
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| AD7739BRU-REEL7 | 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 3.05Msps 24-bit Serial 24-Pin TSSOP T/R 制造商:Analog Devices 功能描述:ADC SGL DELTA-SIGMA 15.133KSPS 24BIT SERL 24TSSOP - Tape and Reel |
| AD7739BRUZ | 功能描述:IC ADC 24BIT 8-CH 24-TSSOP 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 |
| AD7739BRUZ | 制造商:Analog Devices 功能描述:IC, ADC, 24BIT, 15.1KSPS, TSSOP-24 |
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