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參數(shù)資料
| 型號： | ADC12062CIV |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | ADC |
| 英文描述： | 12-Bit, 1 MHz, 75 mW A/D Converter |
| 中文描述： | 2-CH 12-BIT FLASH METHOD ADC, PARALLEL ACCESS, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大小： | 355K |
| 代理商： | ADC12062CIV |
Applications Information
(Continued)
3.0 ANALOG MULTIPLEXER
The ADC12062 has an input multiplexer that is controlled by
the logic level on pin S0 when EOC goes low, as shown in
Figures 1 and 2. Multiplexer setup and hold times with re-
spect to the S/H input can be determined by these two
equations:
t
MS (wrt S/H)
e
t
MS
b
t
EOC (min)
e
50
b
60
e b
10 ns
t
MH (wrt S/H)
e
t
MH
a
t
EOC (max)
e
50
a
125
e
175 ns
Note that t
MS (wrt S/H)
is a negative number; this indicates
that the data on S0 must become valid within 10 ns after
S/H goes low in order to meet the setup time requirements.
S0 must be valid for a length of
(t
MH
a
t
EOC (max)
)
b
(t
MS
b
t
EOC (min)
)
e
185 ns.
Table I shows how the input channels are assigned:
TABLE I. ADC12062 Input
Multiplexer Programming
S0
Channel
0
1
V
IN1
V
IN2
The output of the multiplexer is available to the user via the
MUX OUT pin. This output allows the user to perform addi-
tional signal processing, such as filtering or gain, before the
signal is returned to the ADC IN input and digitized. If no
additional signal processing is required, the MUX OUT pin
should be tied directly to the ADC IN pin.
See Section 9.0 (APPLICATIONS) for a simple circuit that
will alternate between the two inputs while converting at full
speed.
4.0 REFERENCE INPUTS
In addition to the fully differential V
REF
a
and V
REF
b
refer-
ence inputs used on most National Semiconductor ADCs,
the ADC12062 has two sense outputs for precision control
of the ladder voltage. These sense inputs compensate for
errors due to IR drops between the reference source and
the ladder itself. The resistance of the reference ladder is
typically 750
X
. The parasitic resistance (R
P
) of the package
leads, bond wires, PCB traces, etc. can easily be 0.5
X
to
1.0
X
or more. This may not be significant at 8-bit or 10-bit
resolutions, but at 12 bits it can introduce voltage drops
causing offset and gain errors as large as 6 LSBs.
The ADC12062 provides a means to eliminate this error by
bringing out two additional pins that sense the exact voltage
at the top and bottom of the ladder. With the addition of two
op amps, the voltages on these internal nodes can be
forced to the exact value desired, as shown in Figure 10.
TL/H/11490–20
FIGURE 10. Reference Ladder Force and Sense Inputs
14
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADC12062CIVF | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:12-Bit, 1 MHz, 75 mW A/D Converter |
| ADC12062EVAL | 功能描述:BOARD EVALUATION FOR ADC12062 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 過時/停產零件編號 系列:- 標準包裝: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 相關產品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
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| ADC1206S040/DB | 功能描述:數(shù)據(jù)轉換 IC 開發(fā)工具 ADC DEMO BOARD RoHS:否 制造商:Texas Instruments 產品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| ADC1206S040-DB | 功能描述:數(shù)據(jù)轉換 IC 開發(fā)工具 RoHS:否 制造商:Texas Instruments 產品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
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