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| 型号： | EVAL-AD7719EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/40页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD7719 |
| 标准包装： | 1 |
| ADC 的数量： | 2 |
| 位数： | 16，24 |
| 采样率（每秒）： | 105 |
| 数据接口： | 串行 |
| 输入范围： | 2 Vpp |
| 在以下条件下的电源（标准）： | 4.85mW @ 105SPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7719 |
| 已供物品： | 板 |
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REV. A
AD7719
–20–
Table XI. Status Register Bit Designations
Bit
Location
Name
Description
SR7
RDY0
Ready Bit for Main ADC.
Set when data is written to main ADC data registers or on completion of calibration cycle. The RDY0 bit is
cleared automatically after the main ADC data register has been read or after a period of time before the
data register is updated with a new conversion result. This bit is also cleared by a write to the mode bits to
indicate a conversion or calibration.
SR6
RDY1
Ready Bit for Aux ADC.
Set when data is written to aux ADC data registers or on completion of calibration cycle. The RDY1 bit is
cleared automatically after the aux ADC data register has been read or a period of time before the data register
is updated with a new conversion result. This bit is also cleared by a write to the mode bits to indicate a
conversion or calibration.
SR5
CAL
Calibration Status Bit.
Set to indicate completion of calibration. It is set at the same time that the RDY0 and/or RDY1 bits
are set high. Cleared by a write to the mode bits to start another ADC conversion or calibration.
SR4
NOXREF
No External Reference Bit. (Only active if main ADC is active and applies to REFIN1 only.)
Set to indicate that one or both of the REFIN1 pins is floating or the applied voltage is below a specified
threshold. When Set, conversion results are clamped to all 1s.
Cleared to indicate valid reference applied between REFIN1(+) and REFIN1(–).
SR3
ERR0
Main ADC Error Bit.
Set to indicate that the result written to the main ADC data registers has been clamped to all 0s or all 1s.
After a calibration, this bit also flags error conditions that caused the calibration registers not to be written.
Error sources include Overrange, Underrange, and NOXREF.
Cleared by a write to the mode bits to initiate a conversion or calibration.
SR2
ERR1
Aux ADC Error Bit.
Set to indicate that the result written to the Aux ADC data registers has been clamped to all 0s or all 1s.
After a calibration, this bit also flags error conditions that caused the calibration registers not to be written.
Error sources include Overrange, Underrange, and NOXREF.
Cleared by a write to the mode bits to initiate a conversion or calibration.
SR1
0
Reserved for Future Use.
SR0
LOCK
PLL Lock Status Bit.
Set if the PLL has locked onto the 32 kHz crystal oscillator clock. If the user is worried about exact sampling
frequencies, for example, the LOCK bit should be interrogated and the result discarded if the LOCK bit is 0.
Status Register (A3, A2, A1, A0 = 0, 0, 0, 0; Power-On
Reset = 0x00)
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 loading
bits A3 to A0 with 0, 0, 0, 0. Table XI outlines the bit designations
for the Status register. SR0 through SR7 indicate the bit location,
with SR denoting that the bits are in the Status register. SR7
denotes the first bit of the data stream. The number in paren-
theses indicates the power-on/reset default status of that bit.
7
R
S6
R
S5
R
S4
R
S3
R
S2
R
S1
R
S0
R
S
)
0
(
0
Y
D
R)
0
(
1
Y
D
R)
0
(
L
A
C)
0
(
F
E
R
X
O
N)
0
(
0
R
E)
0
(
1
R
E)
0
()
0
(
K
C
O
L
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