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參數(shù)資料
| 型號： | LM12L458CIV |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | 12-Bit Sign Data Acquisition System with Self-Calibration |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 28/36頁 |
| 文件大?。?/td> | 695K |
| 代理商： | LM12L458CIV |
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6.0 Application Circuits
(Continued)
greatly attenuates noise that may be present on the comput-
er’s power supply lines. However, your application may only
need an LC filter.
Figure 16 also shows the recommended supply (V
+ and
V
+) and reference input (V
and V
) bypassing. The
digital and analog supply pins can be connected together to
the same supply voltage. However, they need separate, mul-
tiple bypass capacitors. Multiple capacitors on the supply
pins and the reference inputs ensures a low impedance by-
pass path over a wide frequency range.
All digital interface control signals (IOR, IOW, and AEN),
data lines (DB0–DB7), address lines (A0–A9), and IRQ (in-
terrupt request) lines (IRQ2, IRQ3, and IRQ5) connections
are made through the motherboard slot connector.All analog
signals applied to, or received by, the input multiplexer
(IN0–IN7 for the LM12(H)458 and IN0–IN3, MUXOUT+,
MUXOUT, S/H IN+ and S/H IN for the LM12454), V
,
V
, V
, and the SYNC signal input/ output are ap-
plied through a DB-37 connector on the rear side of the
board. Figure 16 shows that there are numerous analog
ground connections available on the DB-37 connector.
The voltage applied to V
and V
is selected using
two jumpers, JP1 and JP2. JP1 selects between the voltage
applied to the DB-37’s pin 24 or GND and applies it to the
LM12(H)454/8’s V
input. JP2 selects between the
LM12(H)454/8’s internal reference output, V
, and the
voltage applied to the DB-37’s pin 22 and applies it to the
LM12(H)454/8’s V
REF+
input.
TABLE 2. LM12(H)454/8 Evaluation/Interface
Board SW DIP-8 Switch Settings
for Available I/O Memory Locations
Hexidecimal
I/O Memory
Base
Address
100
120
SW DIP-8
SW1
(SEL0)
ON
OFF
SW2
(SEL1)
ON
ON
SW3
(SEL2)
ON
ON
SW4
(SEL3)
ON
ON
Hexidecimal
I/O Memory
Base
Address
140
160
180
1A0
1C0
300
340
280
2A0
The board allows the use of one of three Interrupt Request
(IRQ) lines IRQ2, IRQ3, and IRQ5. The individual IRQ line
can be selected using switches 5, 6, and 7 of SW DIP-8.
When using any of these three IRQs, the user needs to en-
sure that there are no conflicts between the evaluation board
and any other boards attached to the computer’s mother-
board.
Switches 1–4, along with address lines A5–A9 are used as
inputs to GAL16V8 Programmable Gate Array (U2). This de-
vice forms the interface between the computer’s control and
address lines and generates the control signals used by the
LM12(H)454/8 for CS, WR, and RD. It also generates the
signal that controls the data buffers. Several address ranges
within the computer’s I/O memory map are available. Refer
to Table 2 for the switch settings that gives the desired I/O
memory address range. Selection of an address range must
be done so that there are no conflicts between the evaluation
board and any other boards attached to the computer’s
motherboard. The GAL equations are shown in Figure 17
The GAL functional block diagram is shown in Figure 18
Figures 19, 20, 21, 22 show the layout of each layer in the
3-layer evaluation/interface board plus the silk-screen layout
showing parts placement. Figure 20 is the top or component
side, Figure 21is the middle or ground plane layer, Figure 22
is the circuit side, and Figure 19 is the parts layout.
SW DIP-8
SW1
(SEL0)
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
SW2
(SEL1)
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
SW3
(SEL2)
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
SW4
(SEL3)
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
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|---|---|
| LM12L458CIV/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 |
| LM12L458CIVF | 制造商:Rochester Electronics LLC 功能描述:12-BIT PARALLEL I/O DAS - Bulk |
| LM12L458CIVF/NOPB | 制造商:Texas Instruments 功能描述:ADC Single 114ksps 12-bit+Sign Parallel 44-Pin PLCC |
| LM12P123 | 制造商:SOURIAU 功能描述: 制造商:Souriau Connection Technology 功能描述: |
| LM12S02 | 制造商:SHARP 制造商全稱:Sharp Electrionic Components 功能描述:Color STN LCD Module |
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