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| 型号： | LTC2488IDE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/30页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT DELTA SIG 14-DFN |
| 标准包装： | 91 |
| 位数： | 16 |
| 采样率（每秒）： | 6.9 |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 800µW |
| 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： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-DFN-EP（4x3） |
| 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： | DC1009A-B-ND - BOARD DELTA SIGMA ADC LTC2488 |
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LTC2488
19
2488fa
APPLICATIONS INFORMATION
the 8th falling edge of SCK, the new input data is ignored
and the previously selected input channel remains valid.
If the rising edge of CS occurs after the 8th falling edge
of SCK, the new input channel is loaded and valid for the
next conversion cycle.
Internal Serial Clock, 3-Wire I/O, Continuous
Conversion.
This timing mode uses a 3-wire interface. The conversion
result is shifted out of the device by an internally generated
serial clock (SCK) signal (see Figure 9). In this case, CS is
permanently tied to ground, simplifying the user interface
or transmission over an isolation barrier.
The internal serial clock mode is selected at the end of the
power-on reset (POR) cycle. The POR cycle is concluded
approximately 4ms after VCC exceeds 2V. An internal weak
pull-up is active during the POR cycle; therefore, the internal
serial clock timing mode is automatically selected if SCK
is oating or driven HIGH.
During the conversion, the SCK and the serial data output
pin (SDO) are HIGH (EOC = 1). Once the conversion is
complete, SCK and SDO go LOW (EOC = 0) indicating
the conversion has nished and the device has entered
the sleep state. The device remains in the sleep state a
minimum amount of time (1/2 the internal SCK period)
then immediately begins outputting and inputting data.
The input data is shifted through the SDI pin on the ris-
ing edge of SCK (including the rst rising edge) and the
output data is shifted out the SDO pin on the falling edge
of SCK. The data input/output cycle is concluded and a
new conversion automatically begins after the 24th rising
edge of SCK. During the next conversion, SCK and SDO
remain HIGH until the conversion is complete.
The Use of a 10k Pull-Up on SCK for Internal SCK
Selection
If CS is pulled HIGH while the converter is driving SCK
LOW, the internal pull-up is not available to restore SCK
to a logic HIGH state if SCK is oating. This will cause the
device to exit the internal SCK mode on the next falling
edge of CS. This can be avoided by adding an external 10k
pull-up resistor to the SCK pin.
Figure 7. Internal Serial Clock, Single Cycle Operation
VCC
FO
SCK
SDI
GND
REFERENCE
VOLTAGE
0.1V TO VCC
ANALOG
INPUTS
= EXTERNAL OSCILLATOR
= INTERNAL OSCILLATOR
LTC2488
4-WIRE
SPI INTERFACE
OPTIONAL
10k
VCC
REF+
REF–
CH0
CH1
CH2
CH3
COM
CS
12
1
13
14
8
9
10
11
7
3
4
6
5
2
2.7V TO 5.5V
0.1μF
10μF
SDO
Hi-Z
2488 F07
CS
SCK
(INTERNAL)
SDI
SDO
CONVERSION
SLEEP
DATA INPUT/OUTPUT
CONVERSION
EOC
1
0
EN
SGL
A2
A1
A0
ODD
DON'T CARE
MSB
SIG
“0”
<tEOCTEST
12
3
4
5
6
7
8
9
19
20
21
22
23
24
LSB
BIT 23 BIT 22 BIT 21 BIT 20 BIT 19 BIT 18 BIT 17 BIT 16 BIT 15
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
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