- 制造厂商:TI
- 产品类别:数据转换器
- 技术类目:模数转换器 (ADC) - 精密模数转换器 (<=10MSPS)
- 功能描述:具有自校准功能的 88kSPS、12 位 + 符号数据采集系统
- 点击这里打开及下载LM12458的技术文档资料
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The LM12458, and LM12H458 are highly integrated Data Acquisition Systems. Operating on just 5V, they combine a fully-differential self-calibrating (correcting linearity 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 consecutive 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 obsolete LM12454 has a four-channel multiplexer, a differential multiplexer output, and a differential S/H input. The LM12(H)458 can also operate with 8-bit + sign resolution and in a supervisory "watchdog" mode that compares an input signal against two programmable 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 absolute or ratiometric operation or can be derived using the internal 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 data bus. The LM12(H)458 includes a direct memory access (DMA) interface for high-speed conversion data transfer.
Additional applications information can be found in applications notes AN-906, AN-947 and AN-949.
Key Specifications
(fCLK = 5 MHz; 8 MHz, H)
Resolution | 12-bit + sign or 8-bit + sign |
13-bit conversion time | 8.8 µs, 5.5 µs (H) (max) |
9-bit conversion time | 4.2 µs, 2.6 µs (H) (max) |
13-bit Through-put rate | 88k samples/s (min),140k samples/s (H) (min) |
Comparison time ("watchdog" mode) | 2.2 µs (max),1.4 µs (H) (max) |
ILE | ±1 LSB (max) |
VIN range | GND to VA+ |
Power Consumption | 30 mW, 34 mW (H) (max) |
Stand-by mode | 50 µW (typ) |
Single supply | 3V to 5.5V |
- Three operating modes: 12-bit + sign, 8-bit + sign, and "watchdog"
- Single-ended or differential inputs
- Built-in Sample-and-Hold and 2.5V bandgap reference
- Instruction RAM and event sequencer
- 8-channel multiplexer
- 32-word conversion FIFO
- Programmable acquisition times and conversion rates
- Self-calibration and diagnostic mode
- 8- or 16-bit wide data bus microprocessor or DSP interface
- Resolution (Bits)
- 12
- Number of input channels
- 8
- Sample rate (Max) (kSPS)
- 114
- Interface type
- Parallel
- Architecture
- SAR
- Input type
- Differential, Single-Ended
- Multi-channel configuration
- Multiplexed
- Rating
- Catalog
- Reference mode
- Ext, Int
- Input range (Max) (V)
- 5.5
- Input range (Min) (V)
- 0
- Features
- —
- Operating temperature range (C)
- -40 to 85
- Power consumption (Typ) (mW)
- 30
- Analog voltage AVDD (Min) (V)
- 3
- SNR (dB)
- 77.5
- Analog voltage AVDD (Max) (V)
- 5.5
- INL (Max) (+/-LSB)
- 1
- Digital supply (Min) (V)
- 3
- Digital supply (Max) (V)
- 5.5
LM12458的完整型号有:LM12458CIV/NOPB、LM12458CIVX/NOPB,以下是这些产品的关键参数及官网采购报价:
LM12458CIV/NOPB,工作温度:-40 to 85,封装:PLCC (FN)-44,包装数量MPQ:25个,MSL 等级/回流焊峰值温度:Level-3-245C-168 HR,引脚镀层/焊球材料:SN,TI官网LM12458CIV/NOPB的批量USD价格:15.75(1000+)
LM12458CIVX/NOPB,工作温度:-40 to 85,封装:PLCC (FN)-44,包装数量MPQ:500个,MSL 等级/回流焊峰值温度:Level-3-245C-168 HR,引脚镀层/焊球材料:SN,TI官网LM12458CIVX/NOPB的批量USD价格:13.75(1000+)
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