LTC2442 Series

24-Bit High Speed 4-Channel ΔΣ ADC with Integrated Amplifier

Catalog

24-Bit High Speed 4-Channel ΔΣ ADC with Integrated Amplifier

Part	Configuration	Voltage - Supply, Digital	Voltage - Supply, Analog	Reference Type	Number of A/D Converters	Operating Temperature [Max]	Operating Temperature [Min]	Supplier Device Package	Mounting Type	Package / Case [x]	Package / Case	Architecture	Input Type	Data Interface	Sampling Rate (Per Second)	Number of Inputs	Number of Bits
Analog Devices LTC2442IG#PBF	MUX-ADC	5 V	5 V	External	1	85 °C	-40 °C	36-SSOP	Surface Mount	0.209 " 5.3 mm	36-SSOP	Sigma-Delta	Differential Single Ended	SPI	8 kPer Second	2 4	24
Analog Devices LTC2442CG#TRPBF	MUX-ADC	5 V	5 V	External	1	70 °C	0 °C	36-SSOP	Surface Mount	0.209 " 5.3 mm	36-SSOP	Sigma-Delta	Differential Single Ended	SPI	8 kPer Second	2 4	24
Analog Devices LTC2442IG#TRPBF	MUX-ADC	5 V	5 V	External	1	85 °C	-40 °C	36-SSOP	Surface Mount	0.209 " 5.3 mm	36-SSOP	Sigma-Delta	Differential Single Ended	SPI	8 kPer Second	2 4	24

Catalog

24-Bit High Speed 4-Channel ΔΣ ADC with Integrated Amplifier

Key Features

• 1ppm Linearity with No Missing Codes

• Integrated Ampliﬁer for Direct Sensor Digitization

• 2 Differential or 4 Single-Ended Input Channels

• Up to 8kHz Output Rate (External fO)

• Up to 4kHz Multiplexing Rate (External fO)

• Selectable Speed/Resolution2.1µVRMSNoise at 1.76kHz Output Rate220nVRMSNoise at 13.8Hz Output Rate with Simultaneous 50Hz/60Hz Rejection

• 2.1µVRMSNoise at 1.76kHz Output Rate

• 220nVRMSNoise at 13.8Hz Output Rate with Simultaneous 50Hz/60Hz Rejection

• Guaranteed Modulator Stability and Lock-Up Immunity for any Input and Reference Conditions

• <5µV Offset (4.5V < VCC< 5.5V, –40°C to 85°C)

• Differential Input and Differential Reference with GND to VCCCommon Mode Range

• No Latency Mode, Each Conversion is Accurate Even After a New Channel is Selected

• Internal Oscillator—No External Components

• 36-Lead SSOP Package

Description

The LTC2442 is an ultra high precision, variable speed, 24-bit ΔΣ™ADC with integrated ampliﬁer. The ampliﬁer can be conﬁgured as a buffer for easy input drive of high impedance sensors. 1 part-per-million (ppm) linearity is achievable when the ampliﬁer is conﬁgured in unity gain. External resistors can be used to set a gain for increased resolution of low level input signals. The positive and negative ampliﬁer supply pins may be tied directly to VCC(4.5V to 5.5V) and GND or biased above VCCand below GND for rail-to-rail input signals.The proprietary ΔΣ architecture ensures stable DC accuracy through continuous transparent calibration. Ten speed/resolution combinations from 6.9Hz/220nVRMSto 3.5kHz/25µVRMScan be selected with no latency or shift in DC accuracy. Additionally, a 2X speed mode can be selected enabling output rates up to 7kHz (8kHz with an external oscillator) with one cycle latency.Any combination of single-ended (up to 4 inputs) or differential (up to 2 inputs) can be selected with a common mode input range from ground to VCC. While operating in the 1X speed mode the ﬁrst conversion following a new speed/resolution or channel selection is valid.ApplicationsAuto Ranging 6-Digit DVMsHigh Speed MultiplexingWeight ScalesDirect Temperature MeasurementHigh Speed Data Acquisition