LTC1420: 12-bit高速AD转换器，低功耗与高精度设计

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LTC1420是一款由Linear Technology公司生产的高性能、高精度的12位模拟数字转换器(ADC)，其采样速率为10 million samples per second (10 Msps)，这使得它在数据采集和处理方面具有极高的效率。这款芯片的主要特点包括： 1. **高精度与低功耗**： LTC1420工作在单个5V或双电源±5V下，仅消耗250毫瓦的电流，表现出优秀的能效。这使得它在设计低功耗系统时非常理想。 2. **灵活输入范围**：输入电路设计非常灵活，支持全范围±2.048V、±1.024V和±0.512V，适应不同应用需求。同时，尽管标准配置提供一个2.5V参考电压，但用户可以根据需要调整输入共模电压。 3. **动态范围与线性度**：具有宽广的直流规格，如±1LSB的积分非线性和±1LSB的差分非线性，保证了在整个温度范围内保持良好的转换精度。这对于需要高精度测量的应用至关重要。 4. **卓越的抗干扰性能**： LTC1420拥有出色的交流性能，包括71分贝的信噪比(SNR)和83分贝的相位噪声(SFDR)，尤其是在5MHz的奈奎斯特频率下。这有助于在信号处理过程中有效抑制噪声和失真。 5. **先进样本保持功能**：该芯片的差分输入样本保持电路特别独特，可以捕获单端或差分输入信号，直到达到100MHz的带宽。这对于需要高速数据抓取的系统来说是一项关键特性。 6. **接地环路和共模噪声消除**：由于75分贝的共模抑制比，LTC1420允许用户通过比较信号的差分读数来消除地环路和共模噪声，提高信号质量。 7. **输出逻辑供电灵活性**：为了方便连接到3V组件，LTC1420配备了独立的输出逻辑电源，允许用户根据设计需求选择合适的供电方案。 LTC1420 AD芯片以其12位精度、高速采样率、低功耗以及高级功能，为工业控制、信号处理、仪器仪表和通信系统等领域提供了强大的解决方案，适用于对数据准确性和实时性要求极高的应用场景。

LTC1420

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

Positive Supply Voltage (Note 10) 4.75 5.25 V

Output Supply Voltage (Note 10) 2.7 5.25 V

Negative Supply Voltage Dual Supply Mode –5.25 –4.75 V

Single Supply Mode 0 V

Positive Supply Current ● 48 58 mA

Negative Supply Current ● 1.4 2.5 mA

Power Dissipation ● 250 300 mW

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

SAMPLE

Maximum Sampling Frequency ● 0.02 10 MHz

CONV

Conversion Time ● 70 90 ns

ACQ

Acquisition Time ● 10 30 ns

CLK High Time ● 20 50 ns

CLK Low Time ● 20 50 ns

Aperature Delay of Sample-and-Hold –250 ps

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: All voltage values are with respect to ground with GND and OGND

wired together (unless otherwise noted).

Note 3: When these pin voltages are taken below V

or above V

, they

will be clamped by internal diodes. This product can handle input currents

greater than 100mA below V

or above V

without latchup.

Note 4: When these pin voltages are taken below V

they will be clamped

by internal diodes. This product can handle input currents greater than

100mA below V

without latchup. GAIN is not clamped to V

. When CLK

is taken above V

, it will be clamped by an internal diode. The CLK pin

can handle input currents of greater than 100mA above V

without

latchup.

Note 5: V

= 5V, V

= –5V or 0V, f

SAMPLE

= 10MHz, t

= t

= 5ns unless

otherwise specified.

Note 6: Dynamic specifications are guaranteed for dual supply operation

with a single-ended +A

input and –A

grounded. For single supply

dynamic specifications, refer to the Typical Performance Characteristics.

Note 7: Integral nonlinearity is defined as the deviation of a code from a

straight line passing through the actual endpoints of the transfer curve.

The deviation is measured from the center of the quantization band.

Note 8: Bipolar offset is the offset voltage measured from –0.5LSB

when the output code flickers between 0000 0000 0000 and

1111 1111 1111.

Note 9: Guaranteed by design, not subject to test.

Note 10: Recommended operating conditions.

The ● denotes the specifications which apply over the full operating temperature

range, otherwise specifications are at T

= 25°C. Specifications are guaranteed for both dual supply and single supply operation.

(Note 5)

The ● denotes the specifications which apply over the full operating temperature

range, otherwise specifications are at T

= 25°C. Specifications are guaranteed for both dual supply and single supply operation.

(Note 5)

POWER REQUIRE E TS

TI I G CHARACTERISTICS

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