MCP3461T-ESLASHST datasheet(7/108 Pages) MICROCHIP

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DS20006180D-page 7

MCP3461/2/4

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

—

External Voltage Reference Input

Reference Voltage Range

(VREF+– VREF-)

VREF

0.6

—

AVDD

External Noninverting Input

Voltage Reference

VREF+VREF-+0.6

—

AVDD

External Inverting Input

Voltage Reference

VREF-AGND

—VREF+– 0.6

DC Performance

No Missing Code

Resolution

—

Bits

Note 1

Offset Error

VOS

-900/GAIN

—

900/GAIN

µV

AZ_MUX = 0 (Note 6)

-(0.05 + 0.8/

GAIN)

—(0.05 + 0.8/

GAIN)

AZ_MUX = 1 (Notes 2, 6)

Offset Error Temperature

Coefficient

VOS_DRIFT

—

70/GAIN

300/GAIN

nV/°C

AZ_MUX = 0 (Notes 2, 6)

—

4/GAIN

16/GAIN

—

AZ_MUX = 1 (Notes 2, 6)

Gain Error

-3

—

Note 6

Gain Error

Temperature Coefficient

GE_DRIFT

—0.5

ppm/oC GAIN: 1x, 2x, 4x (

Note 2)

GAIN: 8x (

Note 2)

GAIN: 0.33x, 16x (

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.

Parameter

Sym.

Min.

Typ.

Max.

Units

Test Conditions

Note 1:

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

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

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

Full Scale Range (FSR) = 2 * 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 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.

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