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| 型号： | LTC2440CGN#TR |
| 厂商： | Linear Technology |
| 文件页数： | 4/28页 |
| 文件大小： | 0K |
| 描述： | IC CONV A/D 24-BIT DIFF 16-SSOP |
| 标准包装： | 2,500 |
| 位数： | 24 |
| 采样率（每秒）： | 3.5k |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 40mW |
| 电压电源： | 单电源 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，双极 |
| 配用： | DC570A-ND - BOARD DELTA SIGMA ADC LTC2440 |
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LTC2440
12
2440fd
APPLICATIONS INFORMATION
microcontroller. Bit 31 (EOC) can be captured on the rst
rising edge of SCK. Bit 30 is shifted out of the device on
the rst falling edge of SCK. The nal 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 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 LTC2440 transmits the conversion results and receives
the start of conversion command through a synchronous
2-wire, 3-wire or 4-wire interface. During the conversion
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.
Serial Clock Input/Output (SCK)
The serial clock signal present on SCK (Pin 13) 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 LTC2440 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 10) LOW for external SCK and HIGH
for internal SCK.
Serial Data Output (SDO)
The serial data output pin, SDO (Pin 12), provides the
result of the last conversion as a serial bit stream (MSB
rst) 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 11) 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
rst rising edge of SCK occurs while CS = LOW.
Table 2. LTC2440 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**
0011000
…
0
0.5 VREF** – 1LSB
0
1
0
1
…
1
0.25 VREF**
0010100
…
0
0.25 VREF** – 1LSB
0
1
0
1
…
1
0
0010000
…
0
–1LSB
0001111
…
1
–0.25 VREF**
0001100
…
0
–0.25 VREF** – 1LSB
0
1
0
1
…
1
–0.5 VREF**
0001000
…
0
VIN* < –0.5 VREF**
0000111
…
1
*The differential input voltage VIN = IN+ – IN–. **The differential reference voltage VREF = REF+ – REF –.
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