參數(shù)資料
型號: AD7738BRU
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: 8-Channel, High Throughput,
中文描述: 8-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28
封裝: MO-153AE, TSSOP-28
文件頁數(shù): 12/28頁
文件大?。?/td> 407K
代理商: AD7738BRU
REV. 0
–12–
AD7738
Table VII. Register Summary
Addr
hex
Dir
Bit 7
Bit 6
Bit 5
Bit 4
Default Value
Bit 3
Bit 2
Bit 1
Bit 0
Register
Communications
00
W
0
R/
W
6-Bit Register Address
I/O Port
01
R/W
P0
P0 Pin
P1
P1 Pin
Chip Revision Code
x
x
24 Bits Manufacturing Test Register
P0 DIR P1 DIR
1
RDY FN
0
0
0
Chip Generic Code
0
0
0
SYNC
0
1
Revision
02
R
x
x
0
0
1
Test
03
R/W
ADC Status
04
R
RDY7
0
16-Bit Checksum Register
RDY6
0
RDY5
0
RDY4
0
RDY3
0
RDY2
0
RDY1
0
RDY0
0
Checksum
05
R/W
ADC ZS Calibration
06
R/W
24-Bit ADC Zero-Scale Calibration Register
800000h
24-Bit ADC Full-Scale Register
800000h
16-/24-Bit Data Registers
8000h
24-Bit Channel Zero-Scale Calibration Registers
800000h
24-Bits Channel Full-Scale Calibration Registers
200000h
CH2
CH1
CH0
Channel Number
BUF OFF COM1 COM0
0
0
0
CHOP
FW (7-Bit Filter Word)
1
11h
MD2
MD1
MD0
0
0
0
ADC FS
07
R/W
Channel Data
1
08-0F
R
Channel ZS Calibration
1
10–17
R/W
Channel FS Calibration
1
18–1F
R/W
Channel Status
1
20–27
R
0/P0
0
Stat. Opt.
0
RDY/P1
0
ENABLE
0
NOREF
0
RNG2
0
SIGN
0
RNG1
0
OVR
0
RNG0
0
Channel Setup
1
28–2F
R/W
Channel Conv. Time
1
30–37
R/W
Mode
2
38–3F
R/W
CLKDIS
0
DUMP
0
Cont. RD
0
24/16 Bits CLAMP
0
0
NOTES
1
The three LSBs of the register address, i.e., Bit 2, Bit 1, and Bit 0 in the Communication register, specify the channel number of the register being accessed.
2
There is 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. Address 38h only must be used for reading from the Mode register.
Table VIII. Operational Mode Summary
MD2
MD1
MD0
Mode
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Idle Mode
Continuous Conversion Mode
Single Conversion Mode
Power-Down (Standby) Mode
ADC Zero-Scale Self Calibration
For Future Use
Channel Zero-Scale System Calibration
Channel Full-Scale System Calibration
Table IX. Input Range Summary
RNG2
RNG1
RNG0
Nominal Input Voltage Range
±
2.5 V
0 V to +2.5 V
±
1.25 V
0 V to +1.25 V
±
0.625 V
0 V to +0.625 V
1
1
0
0
0
0
0
0
0
0
1
1
0
1
0
1
0
1
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