参数资料
型号: LTC2418IGN#TRPBF
厂商: Linear Technology
文件页数: 11/48页
文件大小: 0K
描述: IC ADC 24BIT DIFF INPUT 28SSOP
标准包装: 2,500
位数: 24
采样率(每秒): 7.5
数据接口: MICROWIRE?,串行,SPI?
转换器数目: 1
功率耗散(最大): 1mW
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: 28-SSOP(0.154",3.90mm 宽)
供应商设备封装: 28-SSOP
包装: 带卷 (TR)
输入数目和类型: 16 个单端,单极;16 个单端,双极;8 个差分,单极;8 个差分,双极
配用: DC571A-ND - BOARD DELTA SIGMA ADC LTC2418
LTC2414/LTC2418
19
241418fa
Table 6. LTC2414/LTC2418 Interface Timing Modes
Conversion
Data
Connection
SCK
Cycle
Output
and
Configuration
Source
Control
Waveforms
External SCK, Single Cycle Conversion
External
CS and SCK
Figures 5, 6
External SCK, 3-Wire I/O
External
SCK
Figure 7
Internal SCK, Single Cycle Conversion
Internal
CS
CS
Figures 8, 9
Internal SCK, 3-Wire I/O, Continuous Conversion
Internal
Continuous
Internal
Figure 10
last input bit A0 of SDI by the time CS pulled HIGH, the
address information is discarded and the previous
address is kept.
Finally, CS can be used to control the free-running modes
of operation, see Serial Interface Timing Modes section.
Grounding CS will force the ADC to continuously convert
at the maximum output rate selected by FO.
SERIAL INTERFACE TIMING MODES
The LTC2414/LTC2418’s 4-wire interface is SPI and
MICROWIRE compatible. This interface offers several
flexible modes of operation. These include internal/exter-
nal serial clock, 3- or 4-wire I/O, single cycle conversion.
The following sections describe each of these serial inter-
face timing modes in detail. In all these cases, the con-
verter can use the internal oscillator (FO = LOW or FO =
HIGH) or an external oscillator connected to the FO pin.
Refer to Table 6 for a summary.
External Serial Clock, Single Cycle Operation
(SPI/MICROWIRE Compatible)
This timing mode uses an external serial clock to shift out
the conversion result and a CS signal to monitor and
control the state of the conversion cycle, see Figure 5.
APPLICATIO S I FOR ATIO
WU
UU
Figure 5. External Serial Clock, Single Cycle Operation
EOC
BIT 31
SDO
SCK
(EXTERNAL)
CS
(1)
(0)
EN
SGL
A2
A1
A0
ODD/
SIGN
SDI
DON’T CARE
TEST EOC
PARITY
MSB
SIG
BIT 0
LSB
BIT 6
BIT 27
BIT 26
BIT 25
BIT 24
BIT 28
BIT 29
BIT 30
SLEEP
DATA OUTPUT
CONVERSION
241418 F05
CONVERSION
Hi-Z
TEST EOC
VCC
FO
REF+
REF
CH0
CH7
CH8
CH15
COM
SCK
SDI
SDO
CS
GND
919
11
12
21
28
1
8
10
18
17
15
16
20
REFERENCE
VOLTAGE
0.1V TO VCC
ANALOG
INPUTS
= 50Hz REJECTION
= EXTERNAL OSCILLATOR
= 60Hz REJECTION
VCC
1
F
2.7V TO 5.5V
LTC2414/
LTC2418
4-WIRE
SPI INTERFACE
DON’T CARE
TEST EOC
(OPTIONAL)
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