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LTC2440CGNTRPBF

製品説明
仕様・特性

LTC2440 24-Bit High Speed Differential Δ∑ ADC with Selectable Speed/Resolution DESCRIPTION FEATURES n n n n n n n n n n n n Up to 3.5kHz Output Rate Selectable Speed/Resolution 2μVRMS Noise at 880Hz Output Rate 200nVRMS Noise at 6.9Hz Output Rate with Simultaneous 50/60Hz Rejection 0.0005% INL, No Missing Codes Autosleep Enables 20μA Operation at 6.9Hz <5μV Offset (4.5V < VCC < 5.5V, –40°C to 85°C) Differential Input and Differential Reference with GND to VCC Common Mode Range No Latency, Each Conversion is Accurate Even After an Input Step Internal Oscillator—No External Components Pin Compatible with the LTC2410 24-Bit ADC in Narrow 16-Lead SSOP Package APPLICATIONS n n n n n High Speed Multiplexing Weight Scales Auto Ranging 6-Digit DVMs Direct Temperature Measurement High Speed Data Acquisition The LTC®2440 is a high speed 24-bit No Latency Δ∑TM ADC with 5ppm INL and 5μV offset. It uses proprietary delta-sigma architecture enabling variable speed and resolution with no latency. Ten speed/resolution combinations (6.9Hz/200nVRMS to 3.5kHz/25μVRMS) are programmed through a simple serial interface. Alternatively, by tying a single pin HIGH or LOW, a fast (880Hz/2μVRMS) or ultralow noise (6.9Hz, 200nVRMS, 50/60Hz rejection) speed/resolution combination can be easily selected. The accuracy (offset, full-scale, linearity, drift) and power dissipation are independent of the speed selected. Since there is no latency, a speed/resolution change may be made between conversions with no degradation in performance. Following each conversion cycle, the LTC2440 automatically enters a low power sleep state. Power dissipation may be reduced by increasing the duration of this sleep state. For example, running at the 3.5kHz conversion speed but reading data at a 100Hz rate draws 240μA average current (1.1mW) while reading data at a 7Hz output rate draws only 25μA (125μW).The LTC2440 communicates through a flexible 3-wire or 4-wire digital interface that is compatible with the LTC2410 and is available in a narrow 16-lead SSOP package. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. No Latency Δ∑ is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Speed vs RMS Noise 100 Simple 24-Bit 2-Speed Acquisition System VCC = 5V VREF = 5V VIN+ = VIN– = 0V VCC REFERENCE VOLTAGE 0.1V TO VCC ANALOG INPUT –0.5VREF TO 0.5VREF RMS NOISE (μV) 4.5V TO 5.5V BUSY LTC2440 fO REF+ 4 REF– SCK + SDO IN– 3-WIRE SPI INTERFACE CS IN EXT 2440 TA01 2μV AT 880Hz 200nV AT 6.9Hz 1 (50/60Hz REJECTION) 6.9Hz, 200nV NOISE, 50/60Hz REJECTION 10-SPEED SERIAL PROGRAMMABLE SDI GND VCC 10 880Hz OUTPUT RATE, 2μV NOISE 0.1 1 1000 10 100 CONVERSION RATE (Hz) 10000 2440 TA01 2440 TA02 2440fd 1

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