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参数资料
| 型号： | EVAL-AD7764EDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 24/33页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL AD7764 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 312k |
| 数据接口： | 串行 |
| 输入范围： | ±3.2768 V |
| 在以下条件下的电源（标准）： | 300mW @ 312kSPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7764 |
| 已供物品： | 板，CD |
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AD7764
Rev. A | Page 29 of 32
AD7764 REGISTERS
The AD7764 has a number of user-programmable registers. The control register is used to set the functionality of the on-chip buffer and
differential amplifier and provides the option to power down the AD7764. There are also digital gain and overrange threshold registers.
Writing to these registers involves writing the register address followed by a 16-bit data-word. The register addresses, details of individual
bits, and default values are provided in this section.
CONTROL REGISTER
Table 13. Control Register (Address 0x0001, Default Value 0x0000)
MSB
LSB
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
0
RD
OVR
RD
GAIN
0
RD
STAT
0
SYNC
0
BYPASS
REF
0
PWR
DOWN
LPWR
REF BUF
OFF
AMP
OFF
Table 14. Bit Descriptions of Control Register
Bit
Mnemonic
Comment
14
RD OVR 1, 2
Read overrange. If this bit is set, the next read operation outputs the contents of the overrange threshold register
instead of a conversion result.
13
RD GAIN
Read gain. If this bit is set, the next read operation outputs the contents of the digital gain register.
11
RD STAT
Read status. If this bit is set, the next read operation outputs the contents of the status register.
9
SYNC
Synchronize. Setting this bit initiates an internal synchronization routine. Setting this bit simultaneously on multiple
devices synchronizes all filters.
7
BYPASS REF
Bypass reference. Setting this bit bypasses the reference buffer if the buffer is off.
3
PWR DOWN
Power-down. A logic high powers the device down without resetting. Writing a 0 to this bit powers the device back up.
2
LPWR
Low power mode. Set to Logic 1 when AD7764 is in low power mode.
1
REF BUF OFF
Reference buffer off. Asserting this bit powers down the reference buffer.
0
AMP OFF
Amplifier off. Asserting this bit switches the differential amplifier off.
1 Bit 14 to Bit 11 and Bit 9 are self-clearing bits.
2 Only one of the bits can be set in any write operation because it determines the contents of the next read operation.
STATUS REGISTER
Table 15. Status Register (Read Only)
MSB
LSB
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
PARTNO
1
0
FILTER-
SETTLE
0
OVR
0
1
0
REF BUF
ON
AMP
ON
LPWR
DEC 1
DEC 0
Table 16. Bit Descriptions of the Status Register
Bit
Mnemonic
Comment
15
PARTNO
Part number. This bit is set to 1 for the AD7764.
10
FILTER-SETTLE
Filter settling bit. This bit corresponds to the FILTER-SETTLE bit in the status word output in the second 16-bit
read operation. It indicates when data is valid.
9
0
Zero. This bit is set to Logic 0.
8
OVR
Overrange. If the current analog input exceeds the current overrange threshold, this bit is set.
4
REF BUF ON
Reference buffer on. This bit is set when the reference buffer is in use.
3
AMP ON
Amplifier on. This bit is set when the input amplifier is in use.
2
LPWR
Low power mode. This bit is set when operating in low power mode.
1 to 0
DEC_RATE[1:0]
Decimation rate. These bits correspond to the decimation rate in use.
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