RELMON-2kSPS、16bit Σ-Δ ADC MS5046T/5047T/5048T/5048N Ordering information

RELMON-2kSPS、16bit Σ-Δ ADC MS5046T/5047T/5048T/5048N General Description：

MS5046T/MS5047T/MS5048T/MS5048N It is a 16 bit analog-to-digital converter suitable for high-precision and low-cost measurement applications.MS5047/MS5048 is pin to pin compatible with ADS1147/ADS1148.It integrates low-noise programmable gain amplifiers internally,high-precision Sigma-Delta(Σ-Δ)ADC analog-to-digital converter and internal oscillator.MS5047T,MS5048T,MS5048N Internally, it also integrates a low-temperature drift reference and two matching programmable current sources.MS5048T/MS5048N supports four differential inputs，MS5047T supports two differential inputs,MS5046T supports single channel differential input.In addition, the MS504XT series chip also integrates sensors to detect Burnout current sources and bias voltage generators.

MS5046T adopts TSSOP16 package, MS5047T adopts TSSOP20 package, MS5048T adopts TSSOP28 package, and MS5048N adopts QFN32 package.

RELMON-2kSPS、16bit Σ-Δ ADC MS5046T/5047T/5048T/5048N Application:

●   Stress testing

●   Temperature detection

●   Flow meter

●   Industrial process control and instrumentation

RELMON-2kSPS、16bit Σ-Δ ADC MS5046T/5047T/5048T/5048N Features：

●   Programmable conversion rate: up to 2kSPS

●   Integrated input multiplexer

●   Programmable gain: 1 to 128

●   Integrated dual matching programmable current source

●   Integrated low-temperature float 2.048V voltage reference

●   Integrated internal temperature sensor

●   Integrated power detection circuit and VREF detection circuit

●   Integrated self calibration and system calibration

●  Compatible with SPI interface

●   Integrated 50Hz/60Hz wave limiting filter @ 20SPS

●   Simulated power supply voltage:

    Single power supply: 2.7V to 5.25V

    Dual power supply: ± 2.5V

●   Working temperature range: -40 ° C~125 ° C

RELMON-2kSPS、16bit Σ-Δ ADC MS5046T/5047T/5048T/5048N Chip pin definition and packaging size:

RELMON-2kSPS、16bit Σ-Δ ADC MS5046T/5047T/5048T/5048N Internal block diagram of chip

RELMON-2kSPS、16bit Σ-Δ ADC MS5046T/5047T/5048T/5048N Typical application circuit diagram of chip（MS5048T/ MS5048N Schematic diagram for thermocouple measurement applications）

RELMON-2kSPS、16bit Σ-Δ ADC Function Description

Overview

MS5046T/MS5047T/MS5048T/MS5048N It is a highly integrated 16 bit analog-to-digital converter that integrates a low-noise, high input impedance variable gain amplifier, input multiplexer, low-temperature drift reference, ∑ - Δ ADC, internal oscillator, and SPI interface.

Analog input channel

  The input of the analog-to-digital converter is fed into the internal modulator through an on-chip multiplexer and PGA.MS5046T has a pair of differential input ports;MS5047T can be configured as two differential inputs through the storage area MUX0;MS5048T/MS5048N can be configured as 4 differential inputs through the storage area MUX0.In addition, the input port can be configured to connect to an internal excitation circuit generator or a bias voltage generator.Temperature, AVDD, DVDD, and external reference signals can also be detected through an input multiplexer.The input port can also be configured as a general-purpose GPIO port.

Low noise PGA

  MS5046T/MS5047T/MS5048T/MS5048N integrates a low drift, low noise, high input impedance programmable amplifier internally.Set the gain to 1, 2, 4, 8, 16, 32, 64, and 128 through register SYS0.PGA consists of two chopper stabilized amplifiers and resistor feedback,The input of PGA passes through an anti electromagnetic interference filter, as shown in the schematic diagram below:

The relationship between gain setting and full input range is as follows:FSR=±V_REF/GAIN

The common mode input range is as follows:V_AVSS+0.1V+0.5×GAIN×V_IN (max)≤V_CM≤V_AVDD-0.1V-0.5×GAIN×V_IN (max)

Clock source

  MS5046T/MS5047T/MS5048T/MS5048N can use an external clock or an internal clock.Before powering on or resetting,Connect the CLK pin to GND to activate the internal clock.At any time when the CLK pin is connected to an external clock source, the internal clock will be turned off, and the device will continue to operate in the external clock mode. In this case, the device will only change the clock operating mode after being powered on or reset.

Modulator

 The chip integrates a third-order modulator internally, which outputs PCM stream to a digital filter. The clock rate of the modulator is set as follows:

Digital Filter

The chip integrates a programmable FIR digital filter internally, and the following table shows the filtering characteristics at an external clock of 4.096MHz.

Internal reference voltage

 The chip integrates a 2.048V low-temperature drift voltage reference internally, and the voltage reference outputs VREFOUT and VREFCOM require 2.2 μ F to 47 μ F capacitors to be connected,The filtering effect of larger capacitive noise is better, but the reference start time is also larger.For stability reasons, VREFCOM needs to have an AC path to AVSS with a resistance of less than 10Ω.The following figure lists the relationship between the benchmark start time and the peripheral capacitance.

Excitation current output

   For RTD applications, MS5047T, MS5048T, and MS5048N integrate two matched excitation current sources (IDACs) internally. For three wire RTD applications, matching current sources can eliminate the influence of line resistance errors, and output current sources can be configured as  50μA、100μA、250μA、500μA、750μA、1000μA、1500μA。

Sensor detection

 The Burnout current（0.5μA、2μA、10μA）can be configured through internal registers to detect the failure of external sensors. When the sensor is in an open circuit state, the internal Burnout current source pulls the positive input terminal to AVDD and the negative input terminal to AVSS, causing full range conversion output, which indicates sensor overload or no reference voltage. A conversion output close to 0V may indicate sensor short circuit.

Bias voltage generator

  For unbiased thermocouple applications, the chip integrates an internal bias voltage generator, which generates a voltage at the midpoint of the analog supply voltage.For sensors with different capacitances, the bias voltage establishment time is different, as shown in the following table.When a bias voltage is applied to multiple channels, it can cause internal short circuits in the applied channels, so it is necessary to limit the current flowing through the device.

Digital Universal

     IO can control the properties of the analog input multiplexing port through registers, which can be configured as analog input or GPIO. The register IOCFG controls whether it is used as digital IO, the register IODIR controls the input and output characteristics of the digital port, and the IODAT controls the specific data type of digital input and output.

Power supply voltage detection

  The chip integrates digital and analog power supply voltage detection, and the detection result is 1/4 of the power supply voltage.

External reference voltage detection

  The chip integrates an external reference voltage detection function, and the detection result is 1/4 of the actual external reference voltage.When detecting external reference voltage, it is necessary to enable the internal integrated reference voltage.The ambient temperature detection chip integrates an internal ambient temperature detection function. When the temperature detection function is turned on, the anodes of the two diodes are connected to the analog input. At room temperature, the diode input differential voltage is 110mV and the temperature drift is 375μV/°C.

RELMON brand - 2kSPS, 16bit Σ-Δ ADC solution recommendation:

Type	MS5046T	MS5047T	MS5048T	MS5048N
Architecture	Σ-Δ ADC	Σ-Δ ADC	Σ-Δ ADC	Σ-Δ ADC
Resolution	16bit ADC	16bit ADC	16bit ADC	16bit ADC
Sample Rate	2kSPS((max)	2kSPS((max)	2kSPS((max)	2kSPS((max)
Input configuration	Single channel differential input	Two-channel differential input	Four-channel differential input	Four-channel differential input
Interface	Compatible with SPI interface	Compatible with SPI interface	Compatible with SPI interface	Compatible with SPI interface
Vcc span	2.7V~5.25V±2.5V	2.7V~5.25V±2.5V	2.7V~5.25V±2.5V	2.7V~5.25V±2.5V
Icc	0.23mA	0.23mA	0.23mA	0.23mA
Description	Low noise, low power consumption,16bit、2kSPS Σ-Δ ADC	Low noise, low power consumption,16bit、2kSPS Σ-Δ ADC	Low noise, low power consumption,16bit、2kSPS Σ-Δ ADC	Low noise, low power consumption,16bit、2kSPS Σ-Δ ADC
Package