MCP3465R datasheet(5/110 Pages) MICROCHIP

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DS20006414C-page 5

MCP3465R

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

—15

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.

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

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

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

5: 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.

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

Performance Curves”.

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

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

9: 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 the REFIN+/OUT pin.

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