CS5371 datasheet(11/22 Pages) CIRRUS

номер детали	CS5371

подробное описание детали	Low-power, High-performance ?誇 Modulators

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производитель	CIRRUS [Cirrus Logic]

домашняя страница	http://www.cirrus.com

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CS5371 CS5372

DS255F3

11

input signal is a steady state DC signal within

±50 mV of the common mode input voltage. Idle

tones result from patterns in the output bitstream

and appear in the measurement spectrum about

-135 dB down from full scale.

Idle tones can be eliminated by adding differential

DC offset to the modulator inputs. The added off-

set should be applied differentially to the inputs,

common mode offsets do not affect idle tones.

5.1.

Offset Enable - OFST

If the analog inputs are near the common mode

voltage when no signal is present, the OFST pin

can be used to eliminate idle tones.

When

OFST=1, -50 mV of differential offset is added to

the modulator analog inputs to push the idle tones

out of the measurement bandwidth. Care should

be taken that when OFST is active, offset voltages

generated by external circuitry do not negate the

internally added offset.

5.2.

Offset Drift

Offset drift characteristics vary from part to part

and with changes in the power supply voltages. If

the CS5371/72 is used in precision DC measure-

ment applications where offset drift is to be mini-

mized,

the

power

supplies

should

be

well

regulated.

For the lowest offset drift, the CS5371/72 modula-

tors should operate with an MCLK of 2.048 MHz.

The offset drift rate is inversely proportional to

clock frequency, with slower modulator clock rates

exhibiting more offset drift.

Operating from an

MCLK of 1.024 MHz results in twice the offset drift

rate compared to an MCLK of 2.048 MHz.

Because offset drift is not linear with temperature,

an exact drift rate per °C cannot be specified. The

CS5371/72 modulators will exhibit approximately

5 ppm/°C of offset drift operating with an MCLK of

2.048 MHz.

6. VOLTAGE REFERENCE INPUTS

The CS5371/72 modulators are designed to oper-

ate with a 2.5 V voltage reference applied across

the VREF+ and VREF- pins to set the full-scale sig-

nal range of the analog inputs. A 2.5 V voltage ref-

erence results in the highest dynamic range and

best signal-to-noise performance, though smaller

reference voltages may be used.

When the

CS5371/72 modulators are operated with a 2.5 V

reference, the analog inputs measure full-scale

signals of 5 volts peak-to-peak fully differential.

In a single supply power configuration the voltage

reference output should be connected to the

VREF+ pin with the VREF- pin connected to

ground. In a dual supply power configuration the

voltage reference should be powered from the VA+

and VA- supplies, with the modulator VREF+ pin

connected to the voltage reference output and the

VREF- pin connected to VA-. Because most 2.5 V

voltage references require a power supply voltage

greater than 3 V to operate, when powering the

voltage reference from dual supplies the reference

voltage into the VREF+ pin should be defined rela-

tive to the VA- supply.

The selected voltage reference should produce

less than 1

µVrms of noise in the measurement

bandwidth on the VREF+ pin. The digital filter out-

put word rate selection determines the bandwidth

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