参数资料
型号: LTC2442IG#PBF
厂商: Linear Technology
文件页数: 4/32页
文件大小: 0K
描述: IC ADC 24BIT 4CH 36-SSOP
标准包装: 37
位数: 24
采样率(每秒): 8k
数据接口: MICROWIRE?,串行,SPI?
转换器数目: 1
功率耗散(最大): 50mW
电压电源: 单电源
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 36-SSOP(0.209",5.30mm 宽)
供应商设备封装: 36-SSOP
包装: 管件
输入数目和类型: 4 个单端,双极;2 个差分,双极
产品目录页面: 1348 (CN2011-ZH PDF)
配用: DC979A-ND - BOARD DELTA SIGMA ADC LTC2442
LTC2442
12
2442fa
For more information www.linear.com/LTC2442
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 SEL+ and SELpins 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.
Serial Interface Pins
The LTC2442 transmits the conversion result and receives
the start of conversion command through a synchronous
3- or 4-wire interface. During the conversion and sleep
states, this interface can be used to access 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.
Serial Clock Input/Output (SCK)
The serial clock signal present on SCK (Pin 1) is used to
synchronize the data transfer. Each bit of data is shifted
out the SDO pin on the falling edge of the serial clock.
In the Internal SCK mode of operation, the SCK pin is an
output and the LTC2442 creates its own serial clock. In
the External SCK mode of operation, the SCK pin is used
as input. The internal or external SCK mode is selected
by tying EXT (Pin 3) LOW for external SCK and HIGH for
internal SCK.
Serial Data Output (SDO)
The serial data output pin, SDO (Pin 36), provides the
result of the last conversion as a serial bit stream (MSB
first) during the data output state. In addition, the SDO
pin is used as an end of conversion indicator during the
conversion and sleep states.
When CS (Pin 35) is HIGH, the SDO driver is switched
to a high impedance state. This allows sharing the serial
interface with other devices. If CS is LOW during the
convert or sleep state, SDO will output EOC. If CS is LOW
during the conversion phase, the EOC bit appears HIGH on
the SDO pin. Once the conversion is complete, EOC goes
LOW. The device remains in the sleep state until the first
rising edge of SCK occurs while CS = LOW.
Table 2. LTC2442 Output Data Format
Differential Input Voltage
VIN*
Bit 31
EOC
Bit 30
DMY
Bit 29
SIG
Bit 28
MSB
Bit 27
Bit 26
Bit 25
...
Bit 0
VIN* ≥ 0.5 VREF**
0
1
0
...
0
0.5 VREF** –1LSB
0
1
0
1
...
1
0.25 VREF**
0
1
0
1
0
...
0
0.25 VREF** –1LSB
0
1
0
1
...
1
0
1
0
...
0
–1LSB
0
1
...
1
–0.25 VREF**
0
1
0
...
0
–0.25 VREF** –1LSB
0
1
0
1
...
1
–0.5 VREF**
0
1
0
...
0
VIN* < –0.5 VREF**
0
1
...
1
*The differential input voltage VIN = SEL+ – SEL. **The differential reference voltage VREF = REF+ – REF.
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