参数资料
型号: LTC1598CG#TR
厂商: Linear Technology
文件页数: 14/24页
文件大小: 0K
描述: IC ADC 12BIT 5V 8CH SAMPL 24SSOP
标准包装: 1,800
位数: 12
采样率(每秒): 16.8k
数据接口: MICROWIRE?,QSPI?,串行,SPI?
转换器数目: 1
功率耗散(最大): 480µW
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: 24-SSOP(0.209",5.30mm 宽)
供应商设备封装: 24-SSOP
包装: 带卷 (TR)
输入数目和类型: 8 个单端,单极
21
LTC1594/LTC1598
15948fb
TYPICAL APPLICATIONS N
U
MULTICHANNEL A/D USES A SINGLE ANTIALIASING
FILTER
This circuit demonstrates how the LTC1598’s indepen-
dent analog multiplexer can simplify design of a 12-bit
data acquisition system. All eight channels are MUXed into
a single 1kHz, 4th order Sallen-Key antialiasing filter,
which is designed for single supply operation. Since the
LTC1598’s data converter accepts inputs from ground to
the positive supply, rail-to-rail op amps were chosen for
the filter to maximize dynamic range. The LT1368 dual rail-
to-rail op amp is designed to operate with 0.1
μF load
capacitors (C1 and C2). These capacitors provide fre-
quency compensation for the amplifiers and help reduce
the amplifier’s output impedance and improve supply
rejection at high frequencies. The filter contributes less
than 1LSB of error due to offsets and bias currents. The
filter’s noise and distortion are less than –72dB for a
100Hz, 2VP-P offset sine input.
The combined MUX and A/D errors result in an integral
nonlinearity error of
±3LSB (maximum) and a differential
nonlinearity error of
±3/4LSB (maximum). The typical
signal-to-noise plus distortion ratio is 71dB, with approxi-
mately –78dB of total harmonic distortion. The LTC1598
is programmed through a 4-wire serial interface that is
compatable with MICROWIRE, SPI and QSPI. Maximum
serial clock speed is 320kHz, which corresponds to a
16.8kHz sampling rate.
The complete circuit consumes approximately 800
μA
from a single 5V supply.
Simple Data Acquisition System Takes Advantage of the LTC1598’s
MUXOUT/ADCIN Pins-to-Filter Analog Signals Prior to A/D Conversion
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
CH5
CH6
CH7
GND
CLK
CSMUX
DIN
COM
GND
CSADC
DOUT
NC
CH4
CH3
CH2
CH1
CH0
VCC
MUXOUT
ADCIN
VREF
VCC
CLK
NC
LTC1598
ANALOG INPUTS
0V TO 5V
RANGE
7.5k
1
μF
5V
1594/98 TA05
DATA IN
CHIP SELECT
CLOCK
DATA OUT
+
1
μF
0.015
μF
0.03
μF
C2
0.1
μF
7.5k
0.03
μF
0.015
μF
+
C1
0.1
μF
5V
1/2
LT1368
1/2
LT1368
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