參數資料
型號: LTC1598L
廠商: Linear Technology Corporation
元件分類: 串行ADC
英文描述: 4- and 8-Channel, 3V Micropower Sampling 12-Bit Serial I/O A/D Converters
中文描述: 4 -和8通道,3V的微取樣12位串行I /辦公自動化/ D轉換器
文件頁數: 21/24頁
文件大?。?/td> 278K
代理商: LTC1598L
21
LTC1594L/LTC1598L
TYPICAL APPLICATIO
S
N
MULTICHANNEL A/D USES A SINGLE
ANTIALIASING FILTER
This circuit demonstrates how the LTC1598L’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
LTC1598L’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
μ
F 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
U
than 1LSB of error due to offsets and bias currents. The
filter’s noise and distortion are less than –72dB for a
100Hz, 2V
P-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 68dB, with approxi-
mately –78dB of total harmonic distortion. The LTC1598L
is programmed through a 4-wire serial interface that is
compatible with MICROWIRE, SPI and QSPI. Maximum
serial clock speed is 200kHz, which corresponds to a
10.5kHz sampling rate.
The complete circuit consumes approximately 600
μ
A
from a single 3V supply.
Simple Data Acquisition System Takes Advantage of the LTC1598L’s
MUXOUT/ADCIN Pins to Filter Analog Signals Prior to A/D Conversion
1594L/98L TA05
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
20
21
22
23
24
1
2
3
+
8-CHANNEL
MUX
8
COM
GND
4, 9
10
6
5, 14
7
11
CSADC
CSMUX
CLK
D
IN
D
OUT
12
13
NC
NC
12-BIT
SAMPLING
ADC
SERIAL DATA LINK
MICROWIRE AND SPI
COMPATIBLE
ADCIN
MUXOUT
18
3
8
1
2
17
16
V
REF
3.3V
3.3V
15, 19
V
CC
C7
1
μ
F
LTC1598L
C6
0.1
μ
F
+
C2
0.015
μ
F
C8
0.01
μ
F
R2
7.5k
R3
7.5k
R4
7.5k
R1
7.5k
C4
0.03
μ
F
C3
0.1
μ
F
C5
0.015
μ
F
C1
0.03
μ
F
1/2 LT1368
5
7
6
4
+
1/2 LT1368
相關PDF資料
PDF描述
LTC1598LCG Replaced by ADS7961 : 8-Bit, 76 kSPS ADC Serial Out, On-Chip 20 Ch. Analog Mux, 19 Ch. 28-PLCC
LTC1594L 4- Channel, 3V Micropower Sampling 12-Bit Serial I/O A/D Converters(四通道,3V微功耗采樣12位串行輸入/輸出模數轉換器)
LTC1594 8-Bit, 40 kSPS ADC Serial-Out, On-Chip 12-Ch. Analog Mux, 11 Ch. 20-SOIC
LTC1598IG 4- and 8-Channel, Micropower Sampling 12-Bit Serial I/O A/D Converters
LTC1594CS 4- and 8-Channel, Micropower Sampling 12-Bit Serial I/O A/D Converters
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