參數(shù)資料
型號(hào)： DC1012A-C
廠商： Linear Technology
文件頁(yè)數(shù)： 8/34頁(yè)
文件大?。?/td> 0K
描述： BOARD DELTA SIGMA ADC LTC2495
軟件下載： QuikEval System
設(shè)計(jì)資源： DC1012A Schematic
DC1012A Design File
標(biāo)準(zhǔn)包裝： 1
系列： Easy Drive™, QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 16
采樣率（每秒）： 15
數(shù)據(jù)接口： I²C，串行
已用 IC / 零件： LTC2495
已供物品： 板
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LTC2495
2495fd
DATA FORMAT
After a START condition, the master sends a 7-bit address
followed by a read/write (R/W) bit. The R/W bit is 1 for a
read request and 0 for a write request. If the 7-bit address
matches the hard wired LTC2495’s address (one of 27
pin-selectable addresses) the device is selected. When the
device is addressed during the conversion state, it will not
acknowledge R/W requests and will issue a NACK by leav-
ing the SDA line HIGH. If the conversion is complete, the
LTC2495 issues an ACK by pulling the SDA line LOW.
TheLTC2495hastworegisters.Theoutputregister(24bits
long) contains the last conversion result. The input register
(16bitslong)setstheinputchannel,selectsthetemperature
sensor, rejection mode, gain and speed mode.
DATA OUTPUT FORMAT
The output register contains the last conversion result.
After each conversion is completed, the device automati-
cally enters the sleep state where the supply current is
reduced to 1A. When the LTC2495 is addressed for a read
operation, it acknowledges (by pulling SDA LOW) and acts
as a transmitter. The master/receiver can read up to three
bytes from the LTC2495. After a complete read operation
(3 bytes), a new conversion is initiated. The device will
NACK subsequent read operations while a conversion is
being performed.
The data output stream is 24 bits long and is shifted out
on the falling edges of SCL (see Figure 3a). The first bit is
the conversion result sign bit (SIG) (see Tables 1 and 2).
This bit is HIGH if VIN ≥ 0 and LOW if VIN < 0 (where VIN
corresponds to the selected input signal IN+ – IN–). The
second bit is the most significant bit (MSB) of the result.
The first two bits (SIG and MSB) can be used to indicate
over and underrange conditions (see Table 2). If both bits
are HIGH, the differential input voltage is equal to or above
+FS. If both bits are set LOW, the input voltage is below
–FS. The function of these bits is summarized in Table 2.
The 16 bits following the MSB bit are the conversion result
in binary, two’s complement format. The remaining six
bits are always 0.
As long as the voltage on the selected input channels (IN+
and IN–) remains between –0.3V and VCC + 0.3V (absolute
maximum operating range) a conversion result is gener-
ated for any differential input voltage VIN from –FS = –0.5
VREF/Gain to +FS = 0.5 VREF/Gain. For differential input
voltagesgreaterthan+FS,theconversionresultisclamped
to the value corresponding to +FS. For differential input
voltages below –FS, the conversion result is clamped to
the value –FS – 1LSB.
applications inForMation
Table 1. Output Data Format
Differential Input Voltage
VIN*
Bit 23
SIG
Bit 22
MSB
Bit 21
Bit 20
Bit 19
…
Bit 6
LSB
Bits 5-0
Always 0
VIN* ≥ FS**
1
0
…
0
000000
FS** – 1LSB
1
0
1
…
1
000000
0.5 FS**
1
0
1
0
…
0
000000
0.5 FS** – 1LSB
1
0
1
…
1
000000
0
1/0
0
…
0
000000
–1LSB
0
1
…
1
000000
–0.5 FS**
0
1
0
…
0
000000
–0.5 FS** – 1LSB
0
1
0
1
…
1
000000
–FS**
0
1
0
…
0
000000
VIN* < –FS**
0
1
…
1
000000
*The differential input voltage VIN = IN+ – IN–.
**The full-scale voltage FS = 0.5 VREF/Gain.
The sign bit changes state during the 0 output code when the device is operating in the 2x speed mode.
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DC1018B-B 功能描述:DEMO BOARD FOR LT4356-2 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:數(shù)字電位器 嵌入式:- 已用 IC / 零件:AD5258 主要屬性:- 次要屬性:- 已供物品:板 相關(guān)產(chǎn)品:AD5258BRMZ1-ND - IC POT DGTL I2C1K 64P 10MSOPAD5258BRMZ10-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ100-ND - IC POT DGTL I2C 100K 64P 10MSOPAD5258BRMZ50-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ1-R7-ND - IC POT DGTL I2C 1K 64P 10MSOPAD5258BRMZ10-R7-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ50-R7-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ100-R7-ND - IC POT DGTL I2C 100K 64P 10MSOP
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