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参数资料
| 型号： | DC956A |
| 厂商： | Linear Technology |
| 文件页数： | 7/40页 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2485 |
| 软件下载： | QuikEval System |
| 设计资源： | DC956A Design File DC956A Schematic |
| 标准包装： | 1 |
| 系列： | Easy Drive™, QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 6.8 |
| 数据接口： | I²C，串行 |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2485 |
| 已供物品： | 板 |
| 相关产品： | LTC2485CDD#TRPBF-ND - IC ADC 24BIT I2C 10-DFN LTC2485IDD#TRPBF-ND - IC ADC 24BIT I2C 10-DFN LTC2485IDD#PBF-ND - IC ADC 24BIT I2C 10-DFN LTC2485CDD#PBF-ND - IC ADC 24BIT I2C 10-DFN |
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LTC2485
15
2485fc
APPLICATIONS INFORMATION
LTC2485 Data Format
After a START condition, the master sends a 7-bit address
followed by a R/W bit. The bit R/W is 1 for a Read request
and 0 for a Write request. If the 7-bit address agrees with
an LTC2485’s address, that device is selected. When the
device is in the conversion state, it does not accept the
request and issues a Not-Acknowledge (NAK) by leaving
SDA HIGH. A write operation will also generate an NAK
signal. If the conversion is complete, it issues an acknowl-
edge (ACK) by pulling SDA LOW.
The LTC2485 has two registers. The output register contains
the result of the last conversion and a user programmable
conguration register that sets the converter operation
mode.
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 1μA. When the LTC2485 is addressed for a
Read operation, it acknowledges (by pulling SDA LOW)
and acts as a transmitter. The master and receiver can read
up to four bytes from the LTC2485. After a complete Read
operation (4 bytes), the output register is emptied, a new
conversion is initiated, and a following Read request in the
same output phase will be NAKed. The LTC2485 output
data stream is 32 bits long, shifted out on the falling edges
of SCL. The rst bit is the conversion result sign bit (SIG),
(see Tables 2 and 3). This bit is HIGH if VIN ≥ 0. It is LOW
if VIN <0. The second bit is the most signicant bit (MSB)
of the result. The rst two bits (SIG and MSB) can be used
to indicate over range conditions. If both bits are HIGH, the
differential input voltage is above +FS and the following 24
bits are set to LOW to indicate an overrange condition. If
both bits are LOW, the input voltage is below –FS and the
following 24 bits are set to HIGH to indicate an underrange
condition. The function of these two bits is summarized in
Table 1. The next 24 bits contain the conversion results in
binary two’s complement format. The remaining six bits
are Sub LSBs below the 24-bit level.
As long as the voltage on the IN+ and IN– pins is main-
tained within the – 0.3V to (VCC+ 0.3V) absolute maximum
operating range, a conversion result is generated for any
differential input voltage VIN from –FS = –0.5 VREF to
+FS=0.5 VREF. For differential input voltages greater
than +FS, the conversion result is clamped to the value
corresponding to the +FS + 1LSB. For differential input
voltages below –FS, the conversion result is clamped to
the value corresponding to –FS – 1LSB.
Table 2. LTC2485 Status Bits
INPUT RANGE
BIT 31 SIG
BIT 30 MSB
VIN ≥ 0.5 VREF
11
0V ≤ VIN < 0.5 VREF
1/0
0
–0.5 VREF ≤ VIN < 0V
0
1
VIN < – 0.5 VREF
00
Table 3. LTC2485 Output Data Format
DIFFERENTIAL INPUT VOLTAGE VIN*
BIT 31 SIG
BIT 30 MSB
BIT 29
BIT 28
BIT 27
…
BIT 0
VIN* ≥ FS**
1
0
…
0
FS** – 1LSB
1
0
1
…
1
0.5 FS**
1
0
1
0
…
0
0.5 FS** – 1LSB
1
0
1
…
1
0
1/0***
0
…
0
–1LSB
0
1
…
1
– 0.5 FS**
0
1
0
…
0
– 0.5 FS** – 1LSB
0
1
0
1
…
1
–FS**
0
1
0
…
0
VIN* < –FS**
0
1
…
1
*The differential input voltage VIN = IN+ – IN–.
**The full-scale voltage FS = 0.5 VR0F.
*** The sign bit changes state during the 0 output code when the device is operating in the 2x speed mode.
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