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參數(shù)資料
| 型號： | SP7800AKS |
| 英文描述： | 12-Bit 3ms Sampling A/D Converter |
| 中文描述： | 12位為3ms采樣A / D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/13頁 |
| 文件大小： | 171K |
| 代理商： | SP7800AKS |
SP7800ADS/02
SP7800A 12-Bit 3
μ
s Sampling A/D Converter
7
Copyright 2000 Sipex Corporation
INPUT VOLTAGE RANGE AND LSB VALUES
Input Voltage Range Defined As:
Analog Input Connected to Pin
Pin Connected to GND
One Least Significant Bit (LSB)
±
10V
1
2
20V/2
12
4.88mV
±
5V
2
1
10V/2
12
2.44mV
FSR/2
12
OUTPUT TRANSITION VALUES
FFEH TO FFFH
+ FULL SCALE
+10V–3/2LSB
+9.9927V
0V–1/2LSB
–2.44mV
–10V+1/2LSB
-9.9976V
+5V–3/2LSB
+4.9963V
0V–1/2LSB
–1.22mV
–5V+1/2LSB
-4.9988V
7FFH TO 800H
Mid Scale
(Bipolar Zero)
–Full Scale
000H to 001H
Table 2. Input Voltages, Transition Voltages and LSB Values
±
5V Range Offset and Gain
Offset
— Apply 1.5637V to the
±
5V input at pin
2. Adjust the offset potentiometer until the LSB
toggles on and off at code 1010 1000 0000
BIN
=
A80
H
= 2688
DEC
.
Gain
— Apply 4.9963V to the
±
5V input at pin
2. Adjust the gain potentiometer until the LSB
toggles on and off at code 1111 1111 1110
BIN
=
FFE
H
= 4094
DEC
.
±
10V Range Offset and Gain
Offset
— Apply 1.2622V to the
±
10V input at
pin 1. Adjust the offset potentiometer until the
LSB toggles on and off at code 1001 0000 0010
BIN
= 902
H
= 2306
DEC
.
Gain
— Apply 9.9927V to the
±
10V input at pin
1. Adjust the gain potentiometer until the LSB
Figure 3. a)
±
10V Range b)
±
5V Range — With External Trims
toggles on and off at code 1111 1111 1110
BIN
=
FFE
H
= 4094
DEC
.
Layout Considerations
Because of the high resolution and linearity of the
SP7800A
, system design problems such as ground
path resistance and contact resistance become very
important.
The input resistance of the
SP7800A
is 6.3k
or
4.2K
(for the
±
10V and
±
5V ranges respectively).
To avoid introducing distortion, the source resistance
must be very low, or constant with signal level. The
output impedance provided by most op amps is ideal.
Pins 23 (V
) and 24 (V
) are not connected internally
on the
SP7800A
, to maximize accuracy on the chip.
They should be connected together as close as pos-
sible to the unit. Pin 24 may be slightly more sensitive
than pin 23 to supply variations, but to maintain
SP7800A
1
2
3
4
5
6
7
R
2
=100
+5V
±10V
Input
GAIN ADJUST
100
10K
BIPOLAR ZERO ADJUST
R
1
=10K
499
These resistors are different than those used with the ADS7800 Application Note.
These values will work with both the SP7800A and ADS7800.
–15V
SP7800A
1
2
3
4
5
6
7
GAIN ADJUST
R
2
=100
+5V
±5V
Input
R
1
=10KW
1K
–15V
30.1K
301
a)
b)
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| SP7805AIS WAF | 制造商:Texas Instruments 功能描述: |
| SP7805V2-L | 功能描述:DC/DC 開關(guān)控制器 30 TERMINAL 1A POS RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| SP7805V2-L/TR | 功能描述:DC/DC 開關(guān)控制器 30 TERMINAL 1A POS RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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| SP7805V-L | 功能描述:DC/DC 開關(guān)控制器 30 TERMINAL 1A POS RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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