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參數(shù)資料
| 型號： | EVAL-AD7794EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/37頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR AD7794 |
| 產(chǎn)品培訓(xùn)模塊： | ADC Applications ADC Architectures ADC DC/AC Performance |
| 標(biāo)準(zhǔn)包裝： | 1 |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 470 |
| 數(shù)據(jù)接口： | SPI?、QSPI?、MICROWIRE? 和 DSP |
| 輸入范圍： | ±VREF/增益 |
| 在以下條件下的電源（標(biāo)準(zhǔn)）： | 2.5mW @ 470SPS |
| 工作溫度： | -40°C ~ 105°C |
| 已用 IC / 零件： | AD7794 |
| 已供物品： | 板，纜線，CD |
| 相關(guān)產(chǎn)品： | AD7794CRUZ-REEL-ND - IC ADC 24BIT 6CH LP 24-TSSOP AD7794CRUZ-ND - IC ADC 24BIT 6CH LP 24-TSSOP AD7794BRU-ND - IC ADC 24BIT 6CH LP 24-TSSOP AD7794BRUZ-REEL-ND - IC ADC 24BIT 6CH LP 24-TSSOP AD7794BRU-REEL-ND - IC ADC 24BIT 6CH LP 24-TSSOP AD7794BRUZ-ND - IC ADC 24BIT SIG-DEL 6CH 24TSSOP |
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AD7794/AD7795
Rev. D | Page 17 of 36
ON-CHIP REGISTERS
The ADC is controlled and configured via a number of on-chip
registers that are described in the following sections. In the
following descriptions, set implies a Logic 1 state and cleared
implies a Logic 0 state, unless otherwise noted.
COMMUNICATIONS REGISTER
RS2, RS1, RS0 = 0, 0, 0
The communications register is an 8-bit write-only register. All
communications to the part must start with a write operation to
the communications register. The data written to the communi-
cations register determines whether the next operation is a read
or write operation, and to which register this operation takes
place. For read or write operations, once the subsequent read or
write operation to the selected register is complete, the interface
returns to where it expects a write operation to the
communications register. This is the default state of the
interface and, on power-up or after a reset, the ADC is in this
default state waiting for a write operation to the communications
register. In situations where the interface sequence is lost, a
write operation of at least 32 serial clock cycles with DIN high
returns the ADC to this default state by resetting the entire part.
Table 14 outlines the bit designations for the communications
register. CR0 through CR7 indicate the bit location, with CR
denoting the bits are in the communications register. CR7
denotes the first bit of the data stream. The number in brackets
indicates the power-on/reset default status of that bit.
CR7
CR6
CR5
CR4
CR3
CR2
CR1
CR0
WEN(0)
R/W(0)
RS2(0)
RS1(0)
RS0(0)
CREAD(0)
0(0)
Table 14. Communications Register Bit Designations
Bit No.
Mnemonic
Description
CR7
WEN
Write Enable Bit. A 0 must be written to this bit so that the write to the communications register actually occurs. If
a 1 is the first bit written, the part does not clock on to subsequent bits in the register. It stays at this bit location
until a 0 is written to this bit. Once a 0 is written to the WEN bit, the next seven bits are loaded to the
communications register.
CR6
R/W
A 0 in this bit location indicates that the next operation is a write to a specified register. A 1 in this position
indicates that the next operation is a read from the designated register.
CR5 to
CR3
RS2 to RS0
Register Address Bits. These address bits are used to select which registers of the ADC are being selected during
this serial interface communication. See Table 15.
CR2
CREAD
Continuous Read of the Data Register. When this bit is set to 1 (and the data register is selected), the serial
interface is configured so that the data register can be read continuously, that is, the contents of the data register
are automatically placed on the DOUT pin when the SCLK pulses are applied after the RDY pin goes low to
indicate that a conversion is complete. The communications register does not have to be written to for data reads.
To enable continuous read mode, the instruction 01011100 must be written to the communications register. To
exit the continuous read mode, the instruction 01011000 must be written to the communications register while
the RDY pin is low. While in continuous read mode, the ADC monitors activity on the DIN line so it can receive the
instruction to exit continuous read mode. Additionally, a reset occurs if 32 consecutive 1s are seen on DIN.
Therefore, DIN should be held low in continuous read mode until an instruction is written to the device.
CR1 to
CR0
0
These bits must be programmed to Logic 0 for correct operation.
Table 15. Register Selection
RS2
RS1
RS0
Register
Register Size
0
Communications Register During a Write Operation
8-bit
0
Status Register During a Read Operation
8-bit
0
1
Mode Register
16-bit
0
1
0
Configuration Register
16-bit
0
1
Data Register
24-bit (AD7794)/16-Bit (AD7795)
1
0
ID Register
8-bit
1
0
1
IO Register
8-bit
1
0
Offset Register
24-bit (AD7794)/16-Bit (AD7795)
1
Full-Scale Register
24-bit (AD7794)/16-Bit (AD7795)
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|---|---|
| EVAL-AD7795 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Evaluation Board for the AD7795 16-Bit, Low Power Sigma-Delta ADC (6 Channels) |
| EVAL-AD7795EB | 制造商:Analog Devices 功能描述:EVAL BD LOW PWR, 16BIT BFFRED SIGMA-DELTA ADC - Bulk |
| EVAL-AD7795EBZ | 功能描述:BOARD EVAL FOR AD7795 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| EVAL-AD7796EB | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Power, 16-/24-Bit Sigma-Delta ADC for Bridge Sensors |
| EVAL-AD7796EBZ | 功能描述:BOARD EVALUATION FOR AD7796 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
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