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参数资料
| 型号： | AD7706BRU-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/44页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT 3CH 16-TSSOP T/R |
| 标准包装： | 1,000 |
| 位数： | 16 |
| 采样率（每秒）： | 500 |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 1mW |
| 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： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 3 个伪差分，单极; 3 个伪差分，双极 |
| 配用： | EVAL-AD7706EBZ-ND - BOARD EVALUATION FOR AD7706 |
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AD7705/AD7706
Rev. C | Page 20 of 44
DATA REGISTER (RS2, RS1, RS0 = 0, 1, 1)
The data register is a 16-bit, read-only register that contains the
most up-to-date conversion result from the AD7705/AD7706. If
the communication register sets up the part for a write
operation to this register, a write operation must take place to
return the part to its default state. However, the 16 bits of data
written to the part will be ignored by the AD7705/AD7706.
TEST REGISTER (RS2, RS1, RS0 = 1, 0, 0);
POWER-ON/RESET STATUS: 00 HEXADECIMAL
The part contains a test register that is used when testing the
device. The user is advised not to change the status of any of the
bits in this register from the default (power-on or reset) status
of all 0s, because the part will be placed in one of its test modes
and will not operate correctly.
ZERO-SCALE CALIBRATION REGISTER
(RS2, RS1, RS0 = 1, 1, 0);
POWER-ON/RESET STATUS: 1F4000 HEXADECIMAL
The AD7705/AD7706 contain independent sets of zero-scale
registers, one for each of the input channels. Each register is a
24-bit read/write register; therefore, 24 bits of data must be
written, or no data is transferred to the register. This register is
used in conjunction with its associated full-scale register to
form a register pair. These register pairs are associated with
While the part is set up to allow access to these registers over
the digital interface, the parts themselves can no longer access
the register coefficients to scale the output data correctly. As a
result, the first output data read from the part after accessing
the calibration registers (for either a read or write operation)
might contain incorrect data. In addition, a write to the
calibration register should not be attempted while a calibration
is in progress. These eventualities can be avoided by taking the
FSYNC bit in the mode register high before the calibration
register operation, and taking it low after the operation is
complete.
FULL-SCALE CALIBRATION REGISTER
(RS2, RS1, RS0 = 1, 1, 1);
POWER-ON/RESET STATUS: 5761AB HEXADECIMAL
The AD7705/AD7706 contain independent sets of full-scale
registers, one for each of the input channels. Each register is a
24-bit read/write register; therefore, 24 bits of data must be
written, or no data is transferred to the register. This register is
used in conjunction with its associated zero-scale register to
form a register pair. These register pairs are associated with
While the part is set up to allow access to these registers over
the digital interface, the part itself can no longer access the
register coefficients to scale the output data correctly. As a
result, the first output data read from the part after accessing
the calibration registers (for either a read or write operation)
might contain incorrect data. In addition, a write to the
calibration register should not be attempted while a calibration
is in progress. These eventualities can be avoided by taking
FSYNC bit in the mode register high before the calibration
register operation, and taking it low after the operation is
complete.
Calibration Sequences
The AD7705/AD7706 contain a number of calibration options,
as previously outlined. Table 21 summarizes the calibration
types, the operations involved, and the duration of the
operations. There are two methods for determining the end of a
calibration. The first is to monitor when DRDY returns low at
the end of the sequence. This technique not only indicates when
the sequence is complete, but also when the part has a valid new
sample in its data register. This valid new sample is the result of
a normal conversion that follows the calibration sequence. The
second method for determining when calibration is complete is
to monitor the MD1 and MD0 bits of the setup register. When
these bits return to 0 following a calibration command, the
calibration sequence is complete. This technique can indicate
the completion of a calibration earlier than the first method
can, but it cannot indicate when there is a valid new result in
the data register. The time that it takes the mode bits, MD1 and
MD0, to return to 0 represents the duration of the calibration.
The sequence when DRDY goes low includes a normal
conversion and a pipeline delay, tP, to scale the results of this
first conversion correctly. Note that tP never exceeds 2000 ×
Table 21. Calibration Sequences
Calibration Type
MD1, MD0
Calibration Sequence
Duration of Mode Bits
Duration of DRDY
Self-Calibration
0, 1
Internal ZS calibration @ selected gain
+ internal FS calibration @ selected
gain
6 × 1/output rate
9 × 1/output rate + tP
ZS System Calibration
1, 0
ZS calibration on AIN @ selected gain
3 × 1/output rate
4 × 1/output rate + tP
FS System Calibration
1, 1
FS calibration on AIN @ selected gain
3 × 1/output rate
4 × 1/output rate + tP
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相关代理商/技术参数 |
参数描述 |
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| AD7706BRUZ | 功能描述:IC ADC 16BIT 3CH 16-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:1,000 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 |
| AD7706BRUZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:3 V/5 V, 1 mW, 2-/3-Channel, 16-Bit, Sigma-Delta ADCs |
| AD7706BRUZ-REEL | 功能描述:IC ADC 16BIT 3CHAN 16TSSOP 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 |
| AD7706BRUZ-REEL1 | 制造商:AD 制造商全称:Analog Devices 功能描述:3 V/5 V, 1 mW, 2-/3-Channel, 16-Bit, Sigma-Delta ADCs |
| AD7706BRUZ-REEL7 | 功能描述:IC ADC 16BIT 3CHAN 16TSSOP 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 |
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