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| 型号： | LTC2440IGN#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC DIFFER 24-BIT HS 16-SSOP |
| 标准包装： | 100 |
| 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： | -40°C ~ 85°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： | 管件 |
| 输入数目和类型： | 1 个差分，双极 |
| 产品目录页面： | 1348 (CN2011-ZH PDF) |
| 配用： | DC570A-ND - BOARD DELTA SIGMA ADC LTC2440 |
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LTC2440
15
2440fd
APPLICATIONS INFORMATION
Figure 5. External Serial Clock, Single Cycle Operation
EOC = 1 (BUSY = 1) while a conversion is in progress
and EOC = 0 (BUSY = 0) if the device is in the sleep state.
Independent of CS, the device automatically enters the low
power sleep state once the conversion is complete.
When the device is in the sleep state (EOC = 0), its con-
version result is held in an internal static shift register.
The device remains in the sleep state until the rst rising
edge of SCK is seen. Data is shifted out the SDO pin on
each falling edge of SCK. This enables external circuitry
to latch the output on the rising edge of SCK. EOC can be
latched on the rst rising edge of SCK and the last bit of
the conversion result can be latched on the 32nd rising
edge of SCK. On the 32nd falling edge of SCK, the device
begins a new conversion. SDO goes HIGH (EOC = 1) and
BUSY goes HIGH indicating a conversion is in progress.
At the conclusion of the data cycle, CS may remain LOW
and EOC monitored as an end-of-conversion interrupt.
Alternatively, CS may be driven HIGH setting SDO to Hi-Z
and BUSY monitored for the completion of a conversion.
As described above, CS may be pulled LOW at any time in
order to monitor the conversion status on the SDO pin.
Typically, CS remains LOW during the data output state.
However, the data output state may be aborted by pulling
CS HIGH anytime between the fth falling edge (SDI must
be properly loaded each cycle) and the 32nd falling edge
of SCK, see Figure 6. On the rising edge of CS, the device
aborts the data output state and immediately initiates a
new conversion. This is useful for systems not requiring
all 32-bits of output data, aborting an invalid conversion
cycle or synchronizing the start of a conversion.
External Serial Clock, 2-Wire I/O
This timing mode utilizes a 2-wire serial I/O interface.
The conversion result is shifted out of the device by an
externally generated serial clock (SCK) signal, see Figure
7. CS may be permanently tied to ground, simplifying the
user interface or isolation barrier. The external serial clock
mode is selected by tying EXT LOW.
Since CS is tied LOW, the end-of-conversion (EOC) can
be continuously monitored at the SDO pin during the
convert and sleep states. Conversely, BUSY (Pin 15) may
be used to monitor the status of the conversion cycle.
EOC or BUSY may be used as an interrupt to an external
EOC
BIT 31
SDO
BUSY
SCK
(EXTERNAL)
CS
TEST EOC
SUB LSB
MSB
SIG
BIT 0
LSB
BIT 5
BIT 27
BIT 26
BIT 28
BIT 29
BIT 30
SLEEP
DATA OUTPUT
CONVERSION
2440 F05
CONVERSION
Hi-Z
TEST EOC
= EXTERNAL OSCILLATOR
= INTERNAL OSCILLATOR
VCC
fO
BUSY
REF+
REF–
SCK
IN+
IN–
SDO
GND
CS
EXT
2
14
15
3
4
13
5
6
12
1, 8, 9, 16
11
10
SDI
7
REFERENCE VOLTAGE
0.1V TO VCC
ANALOG INPUT RANGE
–0.5VREF TO 0.5VREF
1μF
4.5V TO 5.5V
LTC2440
3-WIRE
SPI INTERFACE
200nV NOISE, 50/60Hz REJECTION
10-SPEED/RESOLUTION PROGRAMMABLE
2μV NOISE, 880Hz OUTPUT RATE
VCC
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