參數(shù)資料
型號(hào)： EVAL-AD7785EBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 6/32頁(yè)
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD7785
標(biāo)準(zhǔn)包裝： 1
ADC 的數(shù)量： 1
位數(shù)： 20
采樣率（每秒）： 470
數(shù)據(jù)接口： 串行
輸入范圍： ±VREF
工作溫度： -40°C ~ 105°C
已用 IC / 零件： AD7785
已供物品： 板，纜線，CD
相關(guān)產(chǎn)品： AD7785BRUZ-REEL-ND - IC ADC 20BIT 3CH LN LP 16-TSSOP
AD7785BRUZ-ND - IC ADC 20BIT SIGMA-DELTA 16TSSOP
AD7785
Rev. 0 | Page 14 of 32
ON-CHIP REGISTERS
The ADC is controlled and configured via a number of on-chip
registers, which are described on the following pages. In the
following descriptions, set implies a Logic 1 state and cleared
implies a Logic 0 state, unless otherwise stated.
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 communica-
tions 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 9 outlines
the bit designations for the communications register. CR0
through CR7 indicate the bit location, CR denoting the bits are
in the communications register. CR7 denotes the first bit of the
data stream. The number in parentheses 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 9. Communications Register Bit Designations
Bit Location
Bit Name
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 of the ADC’s registers are being selected
during this serial interface communication. See Table 10.
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 continuously read. For example, the contents of the
data register are placed on the DOUT pin automatically 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 that 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 to be written to the device.
CR1 to CR0
0
These bits must be programmed to Logic 0 for correct operation.
Table 10. 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 (20-bit conversion followed by four 1s)
1
0
ID Register
8-bit
1
0
1
IO Register
8-bit
1
0
Offset Register
24-bit
1
Full-Scale Register
24-bit
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