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參數(shù)資料
| 型號： | ADC1173CIMTC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | ADC |
| 英文描述： | Pushbutton Switch; Switch Terminals:Solder Lug; Contact Current Max:5A; Leaded Process Compatible:Yes; Mounting Type:Panel; Switch Features:Lighted Indicator RoHS Compliant: Yes |
| 中文描述： | 1-CH 8-BIT RESISTANCE LADDER ADC, PARALLEL ACCESS, PDSO24 |
| 封裝： | TSSOP-24 |
| 文件頁數(shù)： | 10/17頁 |
| 文件大?。?/td> | 466K |
| 代理商： | ADC1173CIMTC |
Functional Description
The ADC1173 uses a new, unique architecture to achieve
7.4 effective bits at and maintains superior dynamic perfor-
mance up to
1
2
the clock frequency.
The analog signal at V
that is within the voltage range set
by V
and V
are digitized to eight bits at up to 20 MSPS.
Input voltages below V
will cause the output word to con-
sist of all zeroes. Input voltages above V
will cause the
output word to consist of all ones. V
has a range of 1.0 Volt
to the analog supply voltage,AV
, while V
has a range of
0 to 2.0 Volts. V
RT
should always be at least 1.0 Volt more
positive than V
RB
.
If V
and V
are connected together and V
RB
and V
RBS
are connected together, the nominal values of V
RT
and V
are 1.56V and 0.36V, respectively. If V
and V
are con-
nected together and V
RB
is grounded, the nominal value of
V
RT
is 1.38V.
Data is acquired at the falling edge of the clock and the digi-
tal equivalent of the data is available at the digital outputs 2.5
clock cycles plus t
later. The ADC1173 will convert as long
as the clock signal is present at pin 12. The Output Enable
pin OE, when low, enables the output pins. The digital out-
puts are in the high impedance state when the OE pin is
high.
Applications Information
1.0 The Analog Input
The analog input of the ADC1173 is a switch followed by an
integrator. The input capacitance changes with the clock
level, appearing as 4 pF when the clock is low, and 11 pF
when the clock is high. Since a dynamic capacitance is more
difficult to drive than a fixed capacitance, choose an amplifier
that can drive this type of load. The CLC409, CLC440,
LM6152, LM6154, LM6181 and LM6182 have been found to
be excellent devices for driving the ADC1173. Do not drive
the input beyond the supply rails.
Figure 3 shows an example of an input circuit using the
LM6181. This circuit has both gain and offset adjustments. If
you desire to eliminate these adjustments, you should re-
duce the signal swing to avoid clipping at the ADC1173 out-
put that can result from normal tolerances of all system com-
ponents. With no adjustments, the nominal value for the
amplifier feedback resistor is 510
and the 5.1k resistor at
the inverting input should be changed to 860
and returned
to +3V rather than to the Offset Adjust potentiometer.
2.0 Reference Inputs
The reference inputs V
(Reference Top) and V
(Refer-
ence Bottom) are the top and bottom of the reference ladder.
Input signals between these two voltages will be digitized to
8 bits. External voltages applied to the reference input pins
should be within the range specified in the Operating Ratings
table (1.0V toAV
for V
and 0V to (AV
- 1.0V) for V
).
Any device used to drive the reference pins should be able to
source sufficient current into the V
RT
pin and sink sufficient
current from the V
RB
pin.
The reference ladder can be self-biased by connecting V
to V
and connecting V
to V
to provide top and bot-
tom reference voltages of approximately 1.56V and 0.36V,
respectively, with V
CC
= 3.0V. This connection is shown in
Figure 3 If V
and V
are tied together, but V
is tied to
analog ground, a top reference voltage of approximately
1.38V is generated. The top and bottom of the ladder should
be bypassed with 10μF tantalum capacitors located close to
the reference pins.
The reference self-bias circuit of Figure 3 is very simple and
performance is adequate for many applications. Superior
performance can generally be achieved by driving the refer-
ence pins with a low impedance source.
By forcing a little current into or out of the top and bottom of
the ladder, as shown in Figure 4 the top and bottom refer-
ence voltages can be trimmed. The resistive divider at the
amplifier inputs can be replaced with potentiometers. The
LMC662 amplifier shown was chosen for its low offset volt-
age and low cost. Note that a negative power supply is
needed for these amplifiers as their outputs may be required
to go slightly negative to force the required reference
voltages.
www.national.com
10
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADC1173CIMTCX | Pushbutton Switch; Contact Current Max:5A; Contact Rating:5A; Leaded Process Compatible:Yes; Mounting Type:Panel; Size/Dimensions:HxWxD 0.708 x0.944 x1.65 in; Switch Features:Lighted Indicator |
| ADC1175CIJM | 8-Bit, 20MHz, 60mW A/D Converter |
| ADC1175CIJMX | 8-Bit, 20MHz, 60mW A/D Converter |
| ADC1175-50 | 8-Bit, 50 MSPS, 125 mW A/D Converter |
| ADC1175-50CIMT | 8-Bit, 50 MSPS, 125 mW A/D Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADC1173CIMTC | 制造商:Texas Instruments 功能描述:IC 8BIT ADC SMD 1173 TSSOP24 |
| ADC1173CIMTC/NOPB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADC1173CIMTCX | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADC1173CIMTCX/NOPB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADC1173EVAL | 功能描述:BOARD EVALUATION FOR ADC1173 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 過時/停產(chǎn)零件編號 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
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