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参数资料
| 型号： | DC847A |
| 厂商： | Linear Technology |
| 文件页数： | 2/28页 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2446 |
| 软件下载： | QuikEval System |
| 设计资源： | DC847A Design File DC847A Schematic |
| 标准包装： | 1 |
| 系列： | QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 8k |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 已用 IC / 零件： | LTC2446 |
| 已供物品： | 板 |
| 相关产品： | LTC2446CUHF#PBF-ND - IC ADC 24BIT 8CH HI SPEED 38QFN LTC2446IUHF#PBF-ND - IC ADC 24BIT 8CH HI SPEED 38QFN LTC2446IUHF#TRPBF-ND - IC ADC 24BIT 8CH HI SPEED 38QFN LTC2446CUHF#TRPBF-ND - IC ADC 24BIT 8CH HI SPEED 38QFN |
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LTC2446/LTC2447
10
24467fa
MSB
BIT 28 BIT 27 BIT 26 BIT 25 BIT 24 BIT 23 BIT 22 BIT 21
BIT 20 BIT 19
BIT 0
LSB
Hi-Z
24467 F03
SIG
BIT 29
“0”
BIT 30
EOC
Hi-Z
CS
SCK
SDI
SDO
BUSY
BIT 31
1
0
EN
SGL
GLBL
A1
A0
OSR3
OSR2
OSR1
OSR0
TWOX
ODD
12345
6
7
89
10
11
12
13
14
32
+FS, the conversion result is clamped to the value corre-
sponding to the +FS + 1LSB. For differential input voltages
below –FS, the conversion result is clamped to the value
corresponding to –FS – 1LSB.
SERIAL INTERFACE PINS
The LTC2446/LTC2447 transmit the conversion results
and receive the start of conversion command through a
synchronous 3- or 4-wire interface. During the conver-
sion and sleep states, this interface can be used to assess
the converter status and during the data output state it is
used to read the conversion result and program the
speed, resolution and input channel.
rising edge of SCK. Bit 30 is shifted out of the device on the
first falling edge of SCK. The final data bit (Bit 0) is shifted
out on the falling edge of the 31st SCK and may be latched
on the rising edge of the 32nd SCK pulse. On the falling
edge of the 32nd SCK pulse, SDO goes HIGH indicating the
initiation of a new conversion cycle. This bit serves as EOC
(Bit 31) for the next conversion cycle. Table 2 summarizes
the output data format.
As long as the voltage on the IN+ and IN– pins is maintained
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
Table 2. LTC2446/LTC2447 Output Data Format
Differential Input Voltage
Bit 31
Bit 30
Bit 29
Bit 28
Bit 27
Bit 26
Bit 25
…
Bit 0
VIN*
EOC
DMY
SIG
MSB
VIN* ≥ 0.5 VREF**
0
0110
0
…
0
0.5 VREF** – 1LSB
0
0101
1
…
1
0.25 VREF**
0
0101
0
…
0
0.25 VREF** – 1LSB
0
0100
1
…
1
0
0100
0
…
0
–1LSB
0
0011
1
…
1
– 0.25 VREF**
0
0011
0
…
0
– 0.25 VREF** – 1LSB
0
0010
1
…
1
– 0.5 VREF**
0
0010
0
…
0
VIN* < –0.5 VREF**
0
0001
1
…
1
*The differential input voltage VIN = IN+ – IN–. **The differential reference voltage VREF = REF+ – REF–.
APPLICATIO S I FOR ATIO
WU
U
Figure 3. SDI Speed/Resolution, Channel Selection, and Data Output Timing
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