MSC1210 datasheet(25/83 Pages) TI

25 / 83 page

MSC1210

SBAS203F − MARCH 2002 − REVISED NOVEMBER 2004

www.ti.com

SINC3 FILTER RESPONSE

(

−3dB = 0.262 • f

DATA)

DATA

−20

−40

−60

−80

−100

−120

234

SINC2 FILTER RESPONSE

(

−3dB = 0.318 • f

DATA)

DATA

−20

−40

−60

−80

−100

−120

FAST SETTLING FILTER RESPONSE

(

−3dB = 0.469 • f

DATA)

DATA

−20

−40

−60

−80

−100

−120

NOTE: f

DATA = Data Output Rate = 1/tDATA

Figure 15. Filter Frequency Responses

VOLTAGE REFERENCE

The MSC1210 can use either an internal or external

voltage reference. The voltage reference selection is

controlled via ADC Control Register 0 (ADCON0, SFR

DCh). The default power-up configuration for the voltage

reference is 2.5V internal.

The internal voltage reference can be selected as either

1.25V or 2.5V. The analog power supply (AVDD) must be

within the specified range for the selected internal voltage

reference. The valid ranges are: VREF = 2.5 internal

(AVDD = 3.3V to 5.25V) and VREF = 1.25 internal

(AVDD = 2.7V to 5.25V). If the internal VREF is selected,

then the REFOUT pin must be connected to REFIN+, and

AGND must be connected to REFIN−. The REFOUT pin

should also have a 0.1

µF capacitor connected to AGND,

as close as possible to the pin. If the internal VREF is not

used, then VREF should be disabled in ADCON0.

If the external voltage reference is selected, it can be used

as either a single-ended input or differential input, for

ratiometric measures. When using an external reference,

it is important to note that the input current will increase for

VREF with higher PGA settings and with a higher

modulator frequency. The external voltage reference can

be used over the input range specified in the Electrical

Characteristics section.

POWER-ON RESET

The on-chip power-on reset (POR) circuitry releases the

device from reset at approximately DVDD = 2.0V. The POR

accommodates power-supply ramp rates as slow as

1V/10ms. To ensure proper operation, the power supply

should ramp monotonically. Note that as the device is

released from reset and program execution begins, the

device current consumption may increase, which may

result in a power-supply voltage drop. If the power supply

ramps at a slower rate, is not monotonic, or a brownout

condition occurs (where the supply does not drop below

the 2.0V threshold), then improper device operation may

occur. The on-chip brownout reset may provide benefit in

these conditions. Figure 16 shows a POR circuit.

10k

Ω

RST

MSC1210

0.1

µF

Ω

Figure 16. POR Circuit

MSC1210 Datasheet(PDF) 25 Page - Texas Instruments

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