参数资料
型号: LTC2430CGN#PBF
厂商: Linear Technology
文件页数: 9/40页
文件大小: 0K
描述: IC ADC 20BIT DIFFINPUT/REF16SSOP
标准包装: 100
位数: 20
采样率(每秒): 7.5
数据接口: MICROWIRE?,串行,SPI?
转换器数目: 2
功率耗散(最大): 1mW
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: 管件
输入数目和类型: 1 个差分,双极
LTC2430/LTC2431
17
24301f
EOC = 0 once the conversion ends. On the falling edge of
EOC, the conversion result is loaded into an internal static
shift register. Data is shifted out the SDO pin on each
falling edge of SCK enabling external circuitry to latch data
on the rising edge of SCK. EOC can be latched on the first
rising edge of SCK. On the 24th falling edge of SCK, SDO
goes HIGH (EOC = 1) indicating a new conversion has
begun.
Internal Serial Clock, Single Cycle Operation
This timing mode uses an internal serial clock to shift out
the conversion result and a CS signal to monitor and
control the state of the conversion cycle, see Figure 8.
In order to select the internal serial clock timing mode, the
serial clock pin (SCK) must be floating (Hi-Z) or pulled
HIGH prior to the falling edge of CS. The device will not
enter the internal serial clock mode if SCK is driven LOW
on the falling edge of CS. An internal weak pull-up resistor
is active on the SCK pin during the falling edge of CS;
therefore, the internal serial clock timing mode is auto-
matically selected if SCK is not externally driven.
Figure 6. External Serial Clock, Reduced Data Output Length
APPLICATIO S I FOR ATIO
WU
UU
SDO
SCK
(EXTERNAL)
CS
DATA
OUTPUT
CONVERSION
SLEEP
TEST EOC
(OPTIONAL)
TEST EOC
DATA OUTPUT
Hi-Z
CONVERSION
2431 F06
MSB
SIG
BIT 8
BIT 19
BIT 9
BIT 20
BIT 21
BIT 22
EOC
BIT 23
BIT 0
EOC
Hi-Z
TEST EOC
VCC
FO
REF+
REF
SCK
IN+
IN
SDO
GND
CS
REFERENCE
VOLTAGE
0.1V TO VCC
ANALOG INPUT RANGE
–0.5VREF TO 0.5VREF
3-WIRE
SPI INTERFACE
1
F
2.7V TO 5.5V
LTC2430/
LTC2431
= 50Hz REJECTION
= EXTERNAL OSCILLATOR
= 60Hz REJECTION
VCC
the device aborts the data output state and immediately
initiates a new conversion. This is useful for systems not
requiring all 24 bits of output data, aborting an invalid con-
version 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 exter-
nally 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 at the end of the
power-on reset (POR) cycle. The POR cycle is concluded
approximately 1ms after VCC exceeds 2V. The level applied
to SCK at this time determines if SCK is internal or external.
SCK must be driven LOW prior to the end of POR in order
to enter the external serial clock timing mode.
Since CS is tied LOW, the end-of-conversion (EOC) can be
continuously monitored at the SDO pin during the convert
and sleep states. EOC may be used as an interrupt to an
external controller indicating the conversion result is
ready. EOC = 1 while the conversion is in progress and
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