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參數(shù)資料
| 型號： | LTC1594LCS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 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-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SO-16 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大小： | 278K |
| 代理商： | LTC1594LCS |
14
LTC1594L/LTC1598L
APPLICATIO
S I
FOR
ATIO
U
W
U
U
CLK
EN
D1
D2
CSMUX
CSADC
B5
B6
B7
B8
B9
B10
B11
D
OUT
CH0 TO
CH7
D
IN
t
CONV
t
suCS
NULL
BIT
D0
B4
B3
B2
B1
B0
EN
D1
t
SMPL
t
ON
t
ON
B5
B6
B7
B8
B9
B10
B11
t
CONV
t
suCS
NULL
BIT
D0
D2
EN
D1
D0
D2
B4
B3
B2
B1
B0
t
SMPL
ADCIN =
MUXOUT
COM = GND
1594L/98L F05
B4
B3
B2
B1
B0
DON’T CARE
DON’T CARE
MUXOUT/ADCIN Loop Economizes
Signal Conditioning
The MUXOUT and ADCIN pins of the LTC1594L/LTC1598L
form a very flexible external loop that allows Program-
mable Gain Amplifier (PGA) and/or processing analog
input signals prior to conversion. This loop is also a cost
effective way to perform the conditioning, because only
one circuit is needed instead of one for each channel.
In the Typical Applications section, there are a few
examples illustrating how to use the MUXOUT/ADCIN loop
to form a PGA and to antialias filter several analog inputs.
ACHIEVING MICROPOWER PERFORMANCE
With typical operating currents of 160
μ
A and automatic
shutdown between conversions, the LTC1594L/
LTC1598L achieve extremely low power consumption
over a wide range of sample rates (see Figure 6). The auto
shutdown allows the supply current to drop with reduced
sample rate. Several things must be taken into account to
achieve such a low power consumption.
Shutdown
The LTC1594L/LTC1598L are equipped with automatic
shutdown features. They draw power when the CS pin is
low. The bias circuits and comparator of the ADC powers
down and the reference input becomes high impedance at
the end of each conversion leaving the CLK running to
clock out the LSB first data or zeroes (see Figures 1 and 2).
When the CS pin is high, the ADC powers down completely
leaving the CLK running to clock the input data word into
MUX. If the CS, D
IN
and CLK are not running rail-to-rail, the
input logic buffers will draw currents. These currents may
be large compared to the typical supply current. To obtain
the lowest supply current, run the CS, D
IN
and CLK pins
rail-to-rail.
D
OUT
Loading
Capacitive loading on the digital output can increase
power consumption. A 100pF capacitor on the D
OUT
pin
can add more than 50
μ
A to the supply current at a 200kHz
clock frequency. An extra 50
μ
A or so of current goes into
charging and discharging the load capacitor. The same
goes for digital lines driven at a high frequency by any
logic. The (C)(V)(f) currents must be evaluated and the
troublesome ones minimized.
Figure 5. Use Separate Chip Selects to Maximize Sample Rate
Figure 6. Automatic Power Shutdown Between Conversions
Allows Power Consumption to Drop with Sample Rate
SAMPLE FREQUENCY (kHz)
0.1
1
S
μ
A
10
100
1000
1
10
100
1594L/98L G01
T
A
= 25
°
C
V
CC
= 2.7V
V
REF
= 2.5V
f
CLK
= 200kHz
相關PDF資料 |
PDF描述 |
|---|---|
| LTC1594LIS | 4- and 8-Channel, 3V Micropower Sampling 12-Bit Serial I/O A/D Converters |
| LTC1598LIG | 4- and 8-Channel, 3V Micropower Sampling 12-Bit Serial I/O A/D Converters |
| LTC1598L | 4- and 8-Channel, 3V Micropower Sampling 12-Bit Serial I/O A/D Converters |
| 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(shù)轉(zhuǎn)換器) |
相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1594LCS#PBF | 功能描述:IC A/D CONV 12BIT SRL 4CH 16SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個單端，單極 |
| LTC1594LCS#TR | 功能描述:IC ADC 12BIT 3V 4CH SAMPL 16SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個單端，單極 |
| LTC1594LCS#TRPBF | 功能描述:IC A/D CONV 12BIT SRL 4CH 16SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個單端，單極 |
| LTC1594LCSPBF | 制造商:Linear Technology 功能描述:LTC1594LCSPBF |
| LTC1594LIS | 功能描述:IC A/D CONV 12BIT SRL 4CH 16SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個單端，單極 |
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