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參數(shù)資料
| 型號(hào)： | AD7708BRZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 18/44頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 16BIT R-R 8/10CH 28SOIC |
| 標(biāo)準(zhǔn)包裝： | 400 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 1.37k |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 3.84mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 28-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SOIC W |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類(lèi)型： | 4 個(gè)差分，單極；4 個(gè)差分，雙極；8 個(gè)偽差分，單極；8 個(gè)偽差分，雙極 |
| 配用： | EVAL-AD7708EBZ-ND - BOARD EVAL FOR AD7708 |
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REV. 0
AD7708/AD7718
–25–
Communications Register (A3, A2, A1, A0 = 0, 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 Communications Register determines whether the next operation is a read or write
operation, the type of read operation, and on which register this operation takes place. For read or write operations, once the subse-
quent 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 AD7708/AD7718 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 AD7708/AD7718 to this default state by resetting the part.
Table XII 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.
7
R
C6
R
C5
R
C4
R
C3
R
C2
R
C1
R
C0
R
C
N
E
W
)
0
(
/
R
W
)
0
()
0
(
0)
0
(
0)
0
(
3
A)
0
(
2
A)
0
(
1
A)
0
(
0
A
Table XII. Communications Register Bit Designations
Bit
Location
Mnemonic
Description
CR7
WEN
Write Enable Bit. A 0 must be written to this bit so the write operation to the Communications Register
actually takes place. If a 1 is written to this bit, the part will not clock on to subsequent bits in the regis
ter. It will stay 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 will be loaded to the Communications Register.
CR6
R/
W
A zero in this bit location indicates that the next operation will be a write to a specified register. A one in
this position indicates that the next operation will be a read from the designated register.
CR5
0
A zero must be written to this bit position to ensure correct operation of the AD7708/AD7718.
CR4
0
A zero must be written to this bit position to ensure correct operation of the AD7708/AD7718.
CR3–CR0
A3–A0
Register Address Bits. These address bits are used to select which of the AD7708/AD7718’s registers are
being accessed during this serial interface communication. A3 is the MSB of the three selection bits.
Table XIII. Register Selection Table
A3
A2
A1
A0
Register
0000Communications Register during a Write Operation
0000
Status Register during a Read Operation
0001Mode Register
0010
ADC Control Register
0011
Filter Register
0100
ADC Data Register
0101
ADC Offset Register
0110
ADC Gain Register
0111I/O Control Register
1000Undefined
1001Undefined
1010Undefined
1011Undefined
1100Test 1 Register
1101Test 2 Register
1110Undefined
1111ID Register
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