MCP3918 datasheet(5/88 Pages) MICROCHIP

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 2014 Microchip Technology Inc.

DS20005287A-page 5

MCP3918

Internal Voltage Reference

Tolerance

VREF

1.176

1.2

1.224

VREFEXT = 0,

TA =+25°C only

Temperature Coefficient

TCVREF

—9

—

ppm/°C TA = -40°C to +125°C,

VREFEXT = 0

Output Impedance

ZOUTVREF

—0.6

—



VREFEXT = 0

Internal Voltage Refer-

ence Operating Current

AIDDVREF

—

µA

VREFEXT = 0,

SHUTDOWN<0> = 1

Voltage Reference Input

Input Capacitance

—

Differential Input Voltage

Range (VREF+ –VREF-)

VREF

1.1

—

1.3

VREFEXT = 1

Absolute Voltage

on REFIN+ pin

VREF+

VREF- +1.1

—

VREF- + 1.3

VREFEXT = 1

Absolute Voltage

on REFIN- pin

VREF-

-0.1

—

+0.1

REFIN- should be connected to

AGND when VREFEXT = 0

Master Clock Input

Frequency Range

fMCLK

—

MHz

CLKEXT = 1 (Note 7)

Crystal Oscillator

Operating Frequency

Range

fXTAL

—

MHz

CLKEXT = 0 (Note 7)

Analog Master Clock

AMCLK

—

MHz

Note 7

Crystal Oscillator

Operating Current

DIDDXTAL

—

µA

CLKEXT = 0

Power Supply

OperatingVoltage,Analog

AVDD

2.7

—

3.6

Operating Voltage, Digital

DVDD

2.7

—

3.6

OperatingCurrent,Analog

(Note 3)

IDD,A

—

0.8

BOOST<1:0> = 00

—1

1.2

BOOST<1:0> = 01

—

1.3

1.7

BOOST<1:0> = 10

—

2.2

2.9

BOOST<1:0> = 11

TABLE 1-1:

ANALOG SPECIFICATIONS (CONTINUED)

Electrical Specifications:

Unless otherwise indicated, all parameters apply at AVDD =DVDD =3V, MCLK =4 MHz;

PRE<1:0> = 00; OSR = 256; GAIN = 1; VREFEXT = 0, CLKEXT = 1, DITHER<1:0> = 11; BOOST<1:0> = 10,

VCM =0V; TA = -40°C to +125°C (Note 1); VIN =1.2 VPP = -0.5 dBFS @ 50/60 Hz on all channels.

Characteristic

Sym.

Min.

Typ.

Max.

Units

Conditions

Note 1:

All specifications are valid down to -45°C.

This specification implies that the ADC output is valid over this entire differential range and that there is no distortion or

instability across this input range. Dynamic Performance specified at -0.5 dB below the maximum signal range,

VIN =1.2 VPP = 424 mVRMS, VREF = 1.2V @ 50/60 Hz. See Section 4.0 “Terminology and Formulas” for definition.

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

For these operating currents, the following configuration bit settings apply: SHUTDOWN<0> = 0, RESET<0> = 0,

VREFEXT = 0, CLKEXT = 0.

For these operating currents, the following configuration bit settings apply: SHUTDOWN<0> = 1, VREFEXT = 1,

CLKEXT = 1.

Applies to all gains. Offset and gain errors depend on the PGA gain setting. See Section 2.0 “Typical Performance

Curves”

for typical performance.

Outside this range, the ADC accuracy is not specified. An extended input range of +/-2V can be applied continuously to

the part, with no damage.

For proper operation and for optimizing the ADC accuracy, AMCLK should be limited to the maximum frequency defined

in Table 5-2, as a function of the BOOST and PGA setting chosen. MCLK can take larger values as long as the

prescaler settings (PRE<1:0>) limit AMCLK = MCLK/PRESCALE within the defined range in Table 5-2.

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