LT1494 / Linear Technology - Datasheet(PDF) Chat AI

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Part No.	LT1494
Manufacturer	LINER
Size	392 Kbytes
Pages	38 pages
Description	Precision Micropower RMS-to-DC Converter

Datasheet Summary with AI

1. Device Overview & Variants

️· Function: Logarithmic Amplifier / RMS-to-DC Converter
️· Variants:
- LTC1966C: Guaranteed functional from 0°C to 70°C. Designed and characterized from -40°C to 85°C.
- LTC1966I: Guaranteed functional from -40°C to 85°C.
- LTC1966H: Guaranteed functional from -40°C to 125°C.
- LTC1966MP: Guaranteed functional from -55°C to 125°C.

2. Key Features and Specifications (Highlights)

️· Input: Protected by shunt diodes to VSS and VDD. Input voltage swings are limited (1V maximum differential input).
️· Output: High impedance; can be overdriven.
️· Oversampling & Noise Shaping: Utilizes these techniques to reduce quantization noise and increase accuracy.
️· Wideband: Inherently wideband, but accuracy degrades at higher input frequencies due to aliased noise.

3. Absolute Maximum Ratings (Important!)

️· Input Voltages: Can withstand voltages within the supply range (protected by ESD diodes).
️· Output Voltages: Subject to internal clipping.
️· Supply Voltages: Not specified, but important to adhere to rated values.
️· Operating Temperature: Varies by variant (see above).

4. Electrical Characteristics (Selected)

️· Supply Voltage: Can operate down to 2.7V single supply, but cannot operate at ±2.7V.
️· Input Offset Voltage (V IOS): Measurement with DC inputs from 50mV to 350mV.
️· Output Offset Voltage (V OOS): Measurement with OUT RTN = V SS and OUT RTN = V DD – 350mV.
️· Input Impedance: Average impedance over many clock cycles.
️· Common Mode Rejection Ratio (CMRR): Measured with DC inputs from 50mV to 350mV.
️· Shutdown Currents (IDDS, ISSS, IIH, IIL): Values for different variants.
️· ENABLE Threshold Voltage (VTH): Varies by supply voltage.

5. Notes & Important Considerations

️· ESD Protection: Input and output are protected, but maximum current limits must be observed.
️· Input Clipping: Occurs at 1V differential input.
️· High-Frequency Accuracy: Degrades due to aliased noise – specifications apply with CAVE = 10µF.
️· Operating Range: Important to check variant-specific temperature ranges.