MCP3910 datasheet(5/90 Pages) MICROCHIP

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DS20005116D-page 5

MCP3910

Internal Voltage Reference

Tolerance

VREF

1.176

1.2

1.224

VREFEXT = 0, TA = +25°C only

Temperature Coefficient

TCVREF

—9

—

ppm/°C TA = -45°C to +125°C,

VREFEXT = 0

Output Impedance

ZOUTVREF

—0.6

—



VREFEXT = 0

Internal Voltage Reference

Operating Current

AIDDVREF

—

µA

VREFEXT = 0,

SHUTDOWN[1:0] = 11

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

Operating Voltage, Analog

AVDD

2.7

—

3.6

Operating Voltage, Digital

DVDD

2.7

—

3.6

Operating Current, Analog

(Note 3)

IDD,A

—

1.5

1.95

BOOST[1:0] = 00

—

1.8

2.3

BOOST[1:0] = 01

—

2.5

3.2

BOOST[1:0] = 10

—

4.4

5.5

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 operation.

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[1:0] = 00,

RESET[1:0] = 00, VREFEXT = 0, CLKEXT = 0.

For these operating currents, the following Configuration bit settings apply: SHUTDOWN[1:0] = 11,

VREFEXT = 1, CLKEXT = 1.

Applies to all gains. Offset and gain errors depend on 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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