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| 型号： | AD7708BRZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 19/44页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT R-R 8/10CH 28SOIC |
| 标准包装： | 400 |
| 位数： | 16 |
| 采样率（每秒）： | 1.37k |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 3.84mW |
| 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： | 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： | 4 个差分，单极；4 个差分，双极；8 个伪差分，单极；8 个伪差分，双极 |
| 配用： | EVAL-AD7708EBZ-ND - BOARD EVAL FOR AD7708 |
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REV. 0
–26–
AD7708/AD7718
Status Register (A3, A2, A1, A0 = 0, 0, 0, 0; Power-On-Reset = 00Hex)
The ADC Status Register is an 8-bit read-only register. To access the ADC Status Register, the user must write to the Communica-
tions Register selecting the next operation to be a read and load Bits A3-A0 with 0, 0, 0,0. Table XIV outlines the bit designations
for the Status Register. SR0 through SR7 indicate the bit location, SR denoting the bits are in the Status Register. SR7 denotes the
first bit of the data stream. The number in brackets indicates the power-on/reset default status of that bit.
R
S7
6
R
S5
R
S4
R
S3
R
S2
R
S1
R
S0
R
S
Y
D
R)
0
()
0
(
0)
0
(
L
A
C)
0
(
0)
0
(
R
E)
0
(
0)
0
(
0)
0
(
K
C
O
L
Table XIV. Status Register Bit Designations
Bit
Location
Mnemonic Description
SR7
RDY
Ready Bit for the ADC
Set when data is transferred to the ADC data registers or on completion of calibration cycle. The RDY
bit is cleared automatically a period of time before the data register is updated with a new conversion
result or after the ADC data register has been read. This bit is also cleared by a write to the mode bits to
indicate a conversion or calibration. The
RDY pin is the complement of the RDY bit.
SR6
0
Bit is automatically cleared. Reserved for future use
SR5
CAL
Calibration Status Bit
Set to indicate completion of calibration. It is set at the same time that the RDY is set high.
Cleared by a write to the mode bits to start another ADC conversion or calibration.
SR4
0
This bit is automatically cleared. Reserved for future use
SR3
ERR
ADC Error Bit
Set to indicate that the result written to the ADC data register has been clamped to all zeros or all ones.
After a calibration this bit also flags error conditions that caused the calibration registers not to be
written. Error sources include Overrange.
Cleared by a write to the mode bits to initiate a conversion or calibration.
SR2
0
This bit is automatically cleared. Reserved for future use
SR1
0
This bit is automatically cleared. Reserved for future use
SR0
LOCK
PLL Lock Status Bit.
Set if the PLL has locked onto the 32.768 kHz crystal oscillator clock. If the user is worried about
exact sampling frequencies etc., the LOCK bit should be interrogated and the result discarded if the
LOCK bit is zero.
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