参数资料
型号: AD7739BRU-REEL
厂商: ANALOG DEVICES INC
元件分类: ADC
英文描述: 8-Channel, High Throughput, 24-Bit Sigma-Delta ADC
中文描述: 8-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO24
封装: MS-153AD, TSSOP-24
文件页数: 14/32页
文件大小: 380K
代理商: AD7739BRU-REEL
AD7739
REGISTER DESCRIPTIONS
Table 11. Register Summary
Register
Rev. 0 | Page 14 of 32
Addr
(hex)
Dir
Bit 7
Bit 6
Bit 5
Bit 4
Default Value
Bit 3
Bit 2
Bit 1
Bit 0
0
P0
R/W
P1
P1 Pin
Chip Revision Code
x
6-Bit Register Address
RDYFN
0
Communications
0x00
W
P0 DIR
1
P1 DIR
1
REDPWR
0
Chip Generic Code
0
0
0
SYNC
0
I/O Port
0x01
R/W
P0 Pin
Revision
0x02
R
x
x
24-Bit Manufacturing Test Register
x
1
0
1
Test
0x03
R/W
RDY7
0
RDY6
0
RDY5
0
RDY4
0
RDY3
0
RDY2
0
RDY1
0
RDY0
0
ADC Status
0x04
R
16-Bit Checksum Register
24-Bit ADC Zero-Scale Calibration Register
0x80 0000
24-Bit ADC Full-Scale Register
0x80 0000
16-/24-Bit Data Registers
0x8000
24-Bit Channel Zero-Scale Calibration Registers
0x80 0000
24-Bit Channel Full-Scale Calibration Registers
0x20 0000
CH0
0/P0
Channel Number
BUFOFF
COM1
COM0
0
0
0
CHOP
1
MD2
MD1
MD0
0
0
0
Checksum
0x05
R/W
ADC Zero-Scale Calibration
0x06
R/W
ADC Full-Scale Calibration
0x07
R/W
Channel Data
1
0x08–0x0F
R
Channel Zero-Scale Cal.
1
0x10–0x17 R/W
Channel Full-Scale Cal.
1
0x18–0x1F R/W
CH2
CH1
RDY/P1
0
ENABLE
0
NOREF
0
RNG2
0
SIGN
0
RNG1
0
OVR
0
RNG0
0
Channel Status
1
0x20–0x27
R
0
Stat OPT
0
Channel Setup
1
0x28–0x2F R/W
FW (7-Bit Filter Word)
0x11
CLKDIS
DUMP
0
Channel Conversion Time
1
0x30–0x37 R/W
Cont RD
0
24/16 BIT
0
CLAMP
0
Mode
2
0x38–0x3F R/W
0
1
The three LSBs of the register address, i.e., Bit 2, Bit 1, and Bit 0 in the communications register, specify the channel number of the register being accessed.
2
The AD7739 has only one mode register, although the mode register can be accessed in one of eight address locations. The address used to write the mode register
specifies the ADC channel on which the mode will be applied. Only address 0x38 must be used for reading from the mode register.
Table 12. Operational Mode Summary
MD2
MD1
MD0
Mode
0
0
0
Idle
0
0
1
Continuous Conversion
0
1
0
Single Conversion
0
1
1
Power-Down (Standby)
1
0
0
ADC Zero-Scale Self-Calibration
1
0
1
ADC Full-Scale Self-Calibration (for 2.5 V)
1
1
0
Channel Zero-Scale System Calibration
1
1
1
Channel Full-Scale System Calibration
Table 13. Input Range Summary
RNG2
RNG1
1
0
1
0
0
0
0
0
0
1
0
1
RNG0
0
1
0
1
0
1
Nominal Input Voltage Range
±2.5 V
+2.5 V
±1.25 V
+1.25 V
±0.625 V
+0.625 V
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