参数资料
型号: AD7738BRU-REEL7
厂商: Analog Devices Inc
文件页数: 9/28页
文件大小: 0K
描述: IC ADC 24BIT 8CH SIG-DEL 28TSSOP
标准包装: 1,000
位数: 24
采样率(每秒): 15.4k
数据接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
转换器数目: 1
功率耗散(最大): 100mW
电压电源: 模拟和数字
工作温度: -40°C ~ 105°C
安装类型: 表面贴装
封装/外壳: 28-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 28-TSSOP
包装: 带卷 (TR)
输入数目和类型: 8 个单端,单极;8 个单端,双极;4 个差分,单极;4 个差分,双极
配用: EVAL-AD7738EBZ-ND - BOARD EVAL FOR AD7738
REV. 0
AD7738
–17–
Channel Setup Registers
8 Bits, Read/Write Register, Address 28h–2Fh, Default Value 00h
These registers are used to configure the selected channel, its input voltage range, and set up the corresponding Channel Status
register.
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Mnemonic
BUF OFF
COM1
COM0
Stat. Opt.
ENABLE
RNG2
RNG1
RNG0
Default
0
Bit
Mnemonic
Description
7
BUF OFF
Buffer Off. If reset to 0, then internal buffer is enabled. Only operation with internal buffer enabled
is recommended.
6, 5
COM1, COM0 Analog Input Configuration. See Table XI.
4
Stat. Opt.
Status Option. When this bit is set to 1, the P1 bit in the Status Channel register will reflect the state
of the P1 pin. When this bit is reset to 0, the P1 bit in the Status Channel register bit will reflect
the channel corresponding RDY bit in the ADC Status register.
3
ENABLE
Channel Enable. Set this bit to 1 to enable the channel in the Continuous Conversion mode. A single
conversion will take place regardless of this bit value.
2–0
RNG2–0
The Channel Input Voltage Range. See Table XII.
Table XI.
COM1
COM0
COM1
COM0
Channel
0
1
0
AIN0–AINCOM
AIN0–AIN1
1
AIN1–AINCOM
AIN2–AIN3
2
AIN2–AINCOM
AIN4–AIN5
3
AIN3–AINCOM
AIN6–AIN7
4
AIN4–AINCOM
AIN0–AIN1
5
AIN5–AINCOM
AIN2–AIN3
6
AIN6–AINCOM
AIN4–AIN5
7
AIN7–AINCOM
AIN6–AIN7
Table XII.
Nominal Input
RNG2
RNG1
RNG0
Voltage Range
10
0
±2.5 V
10
10 V to +2.5 V
00
0
±1.25 V
00
10 V to +1.25 V
01
0
±0.625 V
01
10 V to +0.625 V
Channel Conversion Time Registers
8 Bits, Read/Write Register, Address 30h–37h, Default Value 91h
The Conversion Time registers enable or disable chopping and configure the digital filter for a particular channel.
This register value affects the conversion time, frequency response, and noise performance of the ADC.
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Mnemonic
CHOP
FW (7-Bit Filter Word)
Default
1
11h
Bit
Mnemonic
Description
7
CHOP
Chop Enable Bit. Set to 1 to apply chopping mode for a particular channel.
6–0
FW
CHOP = 1, Single Conversion or Continuous Conversion with one channel enabled.
Conversion Time (
s) = (FW
128 + 248)/MCLK Frequency (MHz), the FW in range of 2 to 127.
CHOP = 1, Continuous Conversion with two or more channels enabled.
Conversion Time (
s) = (FW
128 + 249)/MCLK Frequency (MHz), the FW in range of 2 to 127.
CHOP = 0, Single Conversion or Continuous Conversion with one channel enabled.
Conversion Time (
s) = (FW
64 + 206)/MCLK Frequency (MHz), the FW in range of 3 to 127.
CHOP = 0, Single Conversion or Continuous Conversion with two or more channels enabled.
Conversion Time (
s) = (FW
64 + 207)/MCLK Frequency (MHz), the FW in range of 3 to 127.
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