MCP3461RT-ESLASHST datasheet(7/118 Pages) MICROCHIP

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DS20006404C-page 7

MCP3461/2/4R

Analog Inputs

Input Voltage at Input Pin

CHN

AGND –0.1

—

AVDD + 0.1

Analog inputs are measured

with respect to AGND

Differential Input Range

VIN

-VREF/Gain

—

+VREF/Gain

Differential Input Impedance

(Note 5)

ZIN

—

510

—



GAIN = 0.33x, proportional to

1/AMCLK

—

260

—



GAIN = 1x, proportional to

1/AMCLK

—

150

—



GAIN = 2x, proportional to

1/AMCLK

—80

—



GAIN = 4x, proportional to

1/AMCLK

—40

—



GAIN = 8x, proportional to

1/AMCLK

—20

—



GAIN ≥ 16x, proportional to

1/AMCLK

Analog Input Leakage

Current During ADC

Shutdown

ILI_A

—±10

—

Internal Voltage Reference

Internal VREF Absolute Voltage

IVREF

-2%

2.4

+2%

VREF_SEL = 1,

TA = +25°C only

Internal VREF Temperature

Coefficient

TCREFE

—

ppm/°C TA = -40°C to +125°C,

extended temperature range

(Note 2)

Internal VREF

Temperature Coefficient

TCREFI

—

ppm/°C TA = -40°C to +85°C,

industrial temperature range

(Note 2)

Voltage Reference Buffer

Short-Circuit Current

IREF_SC

—

REFIN+/OUT shorted to AGND,

VREF_SEL = 1 (Note 9)

Internal Reference

Settling Time

tVREF_SET

—

Settling to 10 ppm from final

value, bypass capacitor 1 µF

(Notes 2, 11)

Internal VREF Output Noise

VREF_Noise

—

14.3

—

µV

VREF_SEL = 1, AZ_VREF = 1

(chopper on), TA = +25°C only

(Note 2)

ELECTRICAL CHARACTERISTICS (CONTINUED)

Electrical Specifications: Unless otherwise indicated, all parameters apply at AVDD = 2.7V to 3.6V, DVDD = 1.8V to AVDD +0.1V,

MCLK = 4.9152 MHz, VREF =AVDD, ADC_MODE[1:0] = 11. All other register map bits to their default conditions,

TA = -40°C to +125°C, VIN = -0.5 dBFS at 50 Hz.

Parameters

Sym.

Min.

Typ.

Max.

Units

Conditions

Note 1:

This parameter is ensured by design and not 100% tested.

This parameter is ensured by characterization and not 100% tested.

REFIN- must be connected to ground for single-ended measurements.

Full-Scale Range (FSR) = 2 x VREF/Gain.

This input impedance is due to the internal input sampling capacitor and frequency. This impedance is measured between

the two input pins of the channel selected with the input multiplexer.

Applies to all analog gains. Offset and gain errors depend on analog gain settings. See Section 2.0 “Typical

Performance Curves”.

INL is the difference between the endpoints line and the measured code at the center of the quantization band.

DIDD is measured while no transfer is present on the SPI bus.

An external buffer is recommended for external use.

10: Start-up time is the reaction time to the SPI command.

11: Settling time depends on bypass caps on REFIN+/OUT pin.

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