参数资料
型号: LTC1863IGN#PBF
厂商: Linear Technology
文件页数: 15/16页
文件大小: 0K
描述: IC ADC 12BIT 8CH 200KSPS 16SSOP
标准包装: 100
位数: 12
采样率(每秒): 200k
数据接口: MICROWIRE?,串行,SPI?
转换器数目: 1
功率耗散(最大): 9mW
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: 8 个单端,单极;8 个单端,双极;4 个差分,单极;4 个差分,双极
LTC1863/LTC1867
8
18637fa
TIMING DIAGRAMS
t5 (SDI Setup Time Before SCK↑),
t6 (SDI Hold Time After SCK↑)
50%
t3
0.4V
t7 (SLEEP Mode Wake-Up Time)
t7
SCK
CS/CONV
t8 (BUS Relinquish Time)
t8
CS/CONV
SDO
2.4V
t4 (SDO Valid After CONV↓)
t4
CS/CONV
SDO
2.4V
0.4V
t6
2.4V
0.4V
t5
SCK
SDI
2.4V
0.4V
2.4V
0.4V
SDO
1867 TD
SLEEP BIT (SLP = 0)
READ-IN
10%
90%
Hi-Z
t1 (For Short Pulse Mode)
t2 (SDO Valid Before SCK↑),
t3 (SDO Valid Hold Time After SCK↓)
t1
CS/CONV
t2
SCK
50%
Overview
The LTC1863/LTC1867 are complete, low power multi-
plexed ADCs. They consist of a 12-/16-bit, 200ksps capaci-
tive successive approximation A/D converter, a precision
internal reference, a congurable 8-channel analog input
multiplexer (MUX) and a serial port for data transfer.
Conversions are started by a rising edge on the CS/CONV
input. Once a conversion cycle has begun, it cannot be
restarted. Between conversions, the ADCs receive an input
word for channel selection and output the conversion
result, and the analog input is acquired in preparation for
the next conversion. In the acquire phase, a minimum time
of 1.5μs will provide enough time for the sample-and-hold
capacitors to acquire the analog signal.
During the conversion, the internal differential 16-bit
capacitive DAC output is sequenced by the SAR from
the most signicant bit (MSB) to the least signicant bit
(LSB). The input is sucessively compared with the binary
weighted charges supplied by the differential capacitive
DAC. Bit decisions are made by a low-power, differential
comparator. At the end of a conversion, the DAC output
balances the analog input. The SAR contents (a 12-/16-bit
data word) that represent the analog input are loaded into
the 12-/16-bit output latches.
APPLICATIONS INFORMATION
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