參數(shù)資料
型號(hào)： LM12454CIV
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 模擬信號(hào)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)： 92/103頁
文件大?。?/td> 1355K
代理商： LM12454CIV
ITALIAN TECHNOLOGY
grifo
Pagina B-15
GPC
150 Rel. 3.00
A/D CONVERTER LM 12H458
LM12454/LM12458/LM12H458
12-Bit + Sign Data Acquisition System with
Self-Calibration
General Description
The LM12454, LM12458, and LM12H458 are highly inte-
grated Data Acquisition Systems. Operating on just 5V, they
combine a fully-differential self-calibrating (correcting linear-
ity and zero errors) 13-bit (12-bit + sign) analog-to-digital
converter (ADC) and sample-and-hold (S/H) with extensive
analog functions and digital functionality. Up to 32 consecu-
tive conversions, using two’s complement format, can be
stored in an internal 32-word (16-bit wide) FIFO data buffer.
An internal 8-word RAM can store the conversion sequence
for up to eight acquisitions through the LM12(H)458’s
eight-input multiplexer. The LM12454 has a four-channel
multiplexer, a differential multiplexer output, and a differential
S/H input. The LM12454 and LM12(H)458 can also operate
with 8-bit + sign resolution and in a supervisory “watchdog”
mode that compares an input signal against two program-
mable limits.
Programmable acquisition times and conversion rates are
possible through the use of internal clock-driven timers. The
reference voltage input can be externally generated for ab-
solute or ratiometric operation or can be derived using the in-
ternal 2.5V bandgap reference.
All registers, RAM, and FIFO are directly addressable
through the high speed microprocessor interface to either an
8-bit or 16-bit databus. The LM12454 and LM12(H)458 in-
clude
a
direct
memory
access
high-speed conversion data transfer.
An evaluation/interface board is available. Order num-
ber LM12458EVAL.
Additional applications information can be found in applica-
tions notes AN-906, AN-947 and AN-949.
(DMA)
interface
for
Key Specifications
(f
CLK
= 5 MHz; 8 MHz, H)
j
Resolution
13-bit conversion time
9-bit conversion time
13-bit Through-put rate
12-bit + sign or 8-bit + sign
8.8 μs, 5.5 μs (H) (max)
4.2 μs, 2.6 μs (H) (max)
88k samples/s (min),
140k samples/s (H) (min)
j
j
j
j
Comparison time
(“watchdog” mode)
ILE
V
IN
range
Power dissipation
Stand-by mode
Single supply
2.2 μs (max),
1.4 μs (H) (max)
±
1 LSB (max)
GND to V
A+
j
j
j
30 mW, 34 mW (H) (max)
j
50 μW (typ)
3V to 5.5V
j
Features
n
Three operating modes: 12-bit + sign, 8-bit + sign, and
“watchdog”
n
Single-ended or differential inputs
n
Built-in Sample-and-Hold and 2.5V bandgap reference
n
Instruction RAM and event sequencer
n
8-channel (LM12(H)458), 4-channel (LM12454)
multiplexer
n
32-word conversion FIFO
n
Programmable acquisition times and conversion rates
n
Self-calibration and diagnostic mode
n
8- or 16-bit wide databus dmicroprocessor or DSP
interface
Applications
n
Data Logging
n
Instrumentation
n
Process Control
n
Energy Management
n
Inertial Guidance
TRI-STATE
is a registered trademark of National Semiconductor Corporation.
AT
is a registered trademark of International Business Machines Corporation.
July 1999
L
1
1999 National Semiconductor Corporation
DS011264
www.national.com
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM12458 制造商:NSC 制造商全稱:National Semiconductor 功能描述:12-Bit Sign Data Acquisition System with Self-Calibration
LM12458A WAF 制造商:Texas Instruments 功能描述:
LM12458CIV 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
LM12458CIV/NOPB 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12B PLUS SIGN DATA ACQUISITION SYSTEM 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
LM12458CIV/NOPB 制造商:Texas Instruments 功能描述:A/D Converter (A-D) IC
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