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參數(shù)資料
| 型號： | AD7791BRM |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 24BIT BUFFERED LP 10MSOP |
| 標準包裝： | 50 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 120 |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 230µW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 10-MSOP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個差分，單極；1 個差分，雙極 |
AD7791
Data Sheet
Rev. A | Page 12 of 20
Bit Location
Bit Name
Description
MR5–MR4
0
This bit must be programmed with a Logic 0 for correct operation.
MR3
BO
Burnout Current Enable Bit. When this bit is set to 1 by the user, the 100 nA current sources in the signal
path are enabled. When BO = 0, the burnout currents are disabled. The burnout currents can be enabled
only when the buffer is active.
MR2
U/B
Unipolar/Bipolar Bit. Set by user to enable unipolar coding, i.e., zero differential input will result in
0x000000 output and a full-scale differential input will result in 0xFFFFFF output. Cleared by the user to
enable bipolar coding. Negative full-scale differential input will result in an output code of 0x000000,
zero differential input will result in an output code of 0x800000, and a positive full-scale differential input
will result in an output code of 0xFFFFFF.
MR1
BUF
Configures the ADC for buffered or unbuffered mode of operation. If cleared, the ADC operates in un-
buffered mode, lowering the power consumption of the device. If set, the ADC operates in buffered
mode, allowing the user to place source impedances on the front end without contributing gain errors
to the system.
MR0
0
This bit must be programmed with a Logic 0 for correct operation.
Table 10. Operating Modes
MD1
MD0
Mode
0
Continuous Conversion Mode (De-
fault)
0
1
Reserved
1
0
Single Conversion Mode
1
Power-Down Mode
FILTER REGISTER (RS1, RS0 = 1, 0; POWER-ON/RESET = 0x04)
The filter register is an 8-bit register from which data can be read or to which data can be written. This register is used to set the output
word rate. Table 11 outlines the bit designations for the filter register. FR0 through FR7 indicate the bit locations, FR denoting the bits are in
the filter register. FR7 denotes the first bit of the data stream. The number in brackets indicates the power-on/reset default status of that bit.
FR7
FR6
FR5
FR4
FR3
FR2
FR1
FR0
0(0)
CDIV1(0)
CDIV0(0)
0(0)
FS2(1)
FS1(0)
FS0(0)
Table 11. Filter Register Bit Designations
Bit Location
Bit Name
Description
FR7–FR6
0
These bits must be programmed with a Logic 0 for correct operation.
FR5–FR4
CLKDIV1–
CDIV0
These bits are used to operate the AD7791 in the lower power modes. The clock is internally divided and
the power is reduced. In the low power modes, the update rates will scale with the clock frequency so
that dividing the clock by 2 causes the update rate to be reduced by a factor of 2 also.
00
Normal Mode
01
Clock Divided by 2
10
Clock Divided by 4
11
Clock Divided by 8
FR3
0
This bit must be programmed with a Logic 0 for correct operation.
FR2–FR0
FS2–FS0
These bits set the output word rate of the ADC. The update rate influences the 50 Hz/60 Hz rejection and
the noise. See Table 12, which shows the allowable update rates when normal power mode is used. In
the low power modes, the update rate is scaled with the clock frequency. For example, if the internal
clock is divided by a factor of 2, the corresponding update rates will be divided by 2 also.
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| AD7791BRM-REEL | 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 120sps 24-bit Serial 10-Pin MSOP T/R 制造商:Analog Devices 功能描述:ADC SGL DELTA-SIGMA 0.12KSPS 24BIT SERL 10MSOP - Tape and Reel |
| AD7791BRMZ | 功能描述:IC ADC 24BIT BUFFERED LP 10MSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD7791BRMZ | 制造商:Analog Devices 功能描述:IC 16BIT ADC SMD 7791 MSOP10 |
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