CS5541 datasheet(12/26 Pages) CIRRUS

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CS5541

DS500PP1

2.3 Power Supply Arrangements

The CS5541 is designed to operate with a total sup-

ply voltage of 3.0 V ± 5%. For maximum flexibility

separate pins are provided for VA+, VA-, VD+,

and DGND, which is especially useful with ground

referenced input signals.

Figure 9 illustrates the CS5541 connected with a

single +3.0 V supply for both the analog and digital

sections.

2.4 Clock Generator

The CS5541 includes an oscillator circuit which

can be connected with an external crystal to pro-

vide the master clock for the chip. The chip is de-

signed to operate using a low-cost 32.768 kHz

“tuning fork” type crystal. One lead of the crystal

should be connected to OSC1 and the other to

OSC2. A 10 Megohm resistor should be connected

in parallel with the crystal. Lead lengths should be

minimized to reduce stray capacitance. The con-

verter will operate with an external (CMOS com-

patible) clock applied at OSC1 with frequencies up

to 40 kHz.

2.5 Serial Port Interface

The CS5541’s serial interface consists of four con-

trol lines: CS, SDI, SDO, and SCLK.

CS, Chip Select, is the control line which enables

access to the serial port. If the CS pin is tied to logic

0, the port will function as a three wire interface.

SDI, Serial Data In, is the data signal used to trans-

fer data to the converters.

SDO, Serial Data Out, is the data signal used to

transfer output data from the converters. The SDO

output will be held at high impedance any time CS

is at logic 1.

SCLK, Serial Clock, is the serial bit-clock which

controls the shifting of data to or from the ADC’s

serial port. The CS pin must be held at logic 0 be-

fore SCLK transitions can be recognized by the

port logic. To accommodate opto-isolators SCLK

is designed with a Schmitt-trigger input.

OSC2

VD+

VA+

VREF+

VREF-

DGND

AIN1+

SCLK

SDO

SDI

CS5541

OSC1

+3.0 V

Analog

Optional Clock

Source

Serial

Data

Interface

5 kHz ~ 40 kHz

AIN1-

VA-

0.1

µF

0.1

µF

Ω

AIN2+

AIN2-

Voltage

Reference

Analog

Signal

Sources

Supply

10 M

Ω

Figure 9. CS5541 Configured with +3.0 V Analog Supply.

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