參數(shù)資料
型號: SMP18FS-REEL
廠商: Analog Devices Inc
文件頁數(shù): 7/8頁
文件大?。?/td> 0K
描述: IC AMP SAMPLE HOLD OCTAL 16SOIC
標(biāo)準(zhǔn)包裝: 2,500
放大器類型: 采樣和保持
電路數(shù): 8
轉(zhuǎn)換速率: 7 V/µs
電流 - 輸入偏壓: 500nA
電壓 - 輸入偏移: 2500µV
電流 - 電源: 6mA
電流 - 輸出 / 通道: 1.2mA
電壓 - 電源,單路/雙路(±): 5 V ~ 12 V,±2.5 V ~ 6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 16-SOIC
包裝: 帶卷 (TR)
SMP18
REV. C
–7–
APPLICATION TIPS
All unused digital inputs should be connected to logic LOW.
For analog inputs that may become temporarily disconnected, a
resistor to VDD, VSS or analog ground should be used with a
value ranging from 200 k
to 1 M.
Do not apply signals to the SMP18 with power off unless the in-
put current is limited to less than 10 mA.
TYPICAL APPLICATIONS
An 8-Channel Multiplexed D/A Converter
Figure 1 illustrates a typical demultiplexing function of the
SMP18. It is used to sample-and-hold eight different output
voltages corresponding to eight different digital codes from a
D/A converter. The SMP18’s droop rate of 40 mV/s requires a
refresh once every 250 ms before the voltage drifts beyond
1/2 LSB accuracy (1 LSB of an 8-bit DAC is equivalent to
19.5 mV out of a full-scale voltage of 5 V). For a 10-bit DAC
the refresh rate must be less than 60 ms, and for a 12-bit
system, 15 ms. This implementation is very cost effective com-
pared to using multiple DACs as the number of output channels
increases.
VSS
SMP18
13
14
15
12
1
2
4
5
3
16
6
7
8
9
10
11
+12V
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
3
15
1
5
16
17
4
+12V
+5V
REF02
+12V
VREFAVDD
VOA
VZ
GND
WR
CS
DAC8228
A
B
C
ADDRESS
DECODE
ADDRESS
BUS
DIGITAL
INPUTS
WR
DGND
INH
0.1F
PIN 9
C
PIN 10
B
PIN 11
A
PIN 6
INH
CH
PIN
0
1
X
0
1
0
1
X
0
1
0
1
0
1
0
1
X
0
1
0
1
2
3
4
5
6
7
NONE
13
14
15
12
1
5
2
4
CHANNEL DECODING
Figure 1. 8-Channel Multiplexed D/A Converter
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