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| 型号： | AD7858LBR-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/32页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 8CH SRL 24-SOIC |
| 标准包装： | 1,000 |
| 位数： | 12 |
| 采样率（每秒）： | 100k |
| 数据接口： | 8051，QSPI?，串行，SPI? µP |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 33mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°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 W |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 8 个单端，单极；4 个伪差分，单极 |
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AD7858/AD7858L
REV. B
–13–
CALIBRATION REGISTERS
The AD7858/AD7858L has 10 calibration registers in all, eight for the DAC, one for the offset, and one for gain. Data can be written
to or read from all 10 calibration registers. In self- and system calibration the part automatically modifies the calibration registers; only if the
user needs to modify the calibration registers should an attempt be made to read from and write to the calibration registers.
Addressing the Calibration Registers
The calibration selection bits in the control register CALSLT1 and CALSLT0 determine which of the calibration registers are ad-
dressed (see Table V). The addressing applies to both the read and write operations for the calibration registers. The user should not
attempt to read from and write to the calibration registers at the same time.
Table V. Calibration Register Addressing
CALSLT1
CALSLT0
Comment
0
This combination addresses the Gain (1), Offset (1) and DAC Registers (8). Ten registers in total.
0
1
This combination addresses the Gain (1) and Offset (1) Registers. Two registers in total.
1
0
This combination addresses the Offset Register. One register in total.
1
This combination addresses the Gain Register. One register in total.
Writing to/Reading from the Calibration Registers
For writing to the calibration registers a write to the control
register is required to set the CALSLT0 and CALSLT1 bits.
For reading from the calibration registers a write to the control
register is required to set the CALSLT0 and CALSLT1 bits,
but also to set the RDSLT1 and RDSLT0 bits to 10 (this ad-
dresses the calibration registers for reading). The calibration
register pointer is reset on writing to the control register setting
the CALSLT1 and CALSLT0 bits, or upon completion of all
the calibration register write/read operations. When reset it
points to the first calibration register in the selected write/read
sequence. The calibration register pointer will point to the gain
calibration register upon reset in all but one case, this case being
where the offset calibration register is selected on its own
(CALSLT1 = 1, CALSLT0 = 0). Where more than one calibra-
tion register is being accessed the calibration register pointer will
be automatically incremented after each calibration register
write/read operation. The order in which the 10 calibration
registers are arranged is shown in Figure 7. The user may abort
at any time before all the calibration register write/read opera-
tions are completed, and the next control register write opera-
tion will reset the calibration register pointer. The flow chart in
Figure 8 shows the sequence for writing to the calibration regis-
ters and Figure 9 for reading.
CAL REGISTER
ADDRESS POINTER
GAIN REGISTER
OFFSET REGISTER
DAC 1ST MSB REGISTER
DAC 8TH MSB REGISTER
.
(1)
(2)
(3)
(10)
CALIBRATION REGISTERS
CALIBRATION REGISTER
ADDRESS POINTER
POSITION IS DETERMINED
BY THE NUMBER OF
CALIBRATION REGISTERS
ADDRESSED AND THE
NUMBER OF READ/WRITE
OPERATIONS
Figure 7. Calibration Register Arrangements
When reading from the calibration registers there will always be
two leading zeros for each of the registers. When operating in
Serial Interface Mode 1 the read operations to the calibration
registers cannot be aborted. The full number of read operations
must be completed (see section on Serial Interface Mode 1
Timing for more detail).
START
WRITE TO CONTROL REGISTER SETTING STCAL = 0
AND CALSLT1, CALSLT0 = 00, 01, 10, 11
CAL REGISTER POINTER IS
AUTOMATICALLY RESET
WRITE TO CAL REGISTER
(ADDR1 = 1, ADDR0 = 0)
CAL REGISTER POINTER IS
AUTOMATICALLY INCREMENTED
LAST
REGISTER
WRITE
OPERATION
OR
ABORT
?
FINISHED
YES
NO
Figure 8. Flowchart for Writing to the Calibration Registers
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相关代理商/技术参数 |
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| AD7858LBRZ | 功能描述:IC ADC 12BIT 8CHAN SRL 24SOIC 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 |
| AD7859 | 制造商:AD 制造商全称:Analog Devices 功能描述:3 V to 5 V Single Supply, 200 kSPS 8-Channel, 12-Bit Sampling ADCs |
| AD7859AP | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 12-bit Parallel 44-Pin PLCC 制造商:Rochester Electronics LLC 功能描述:12-BIT,8 CHANNEL,SERIAL 200 KSPS I.C. - Bulk 制造商:Analog Devices 功能描述:IC 12-BIT ADC |
| AD7859AP-REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 12-bit Parallel 44-Pin PLCC T/R 制造商:Rochester Electronics LLC 功能描述:12-BIT,8 CHANNEL,SERIAL 200 KSPS I.C. - Tape and Reel |
| AD7859APZ | 功能描述:IC ADC 12BIT 8CH 200KSPS 44PLCC 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 |
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