UDA1360 データシートの表示（PDF） - Philips Electronics

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UDA1360

Low-voltage low-power stereo audio ADC

Philips Electronics 

Philips Semiconductors

Low-voltage low-power stereo audio ADC

Product specification

UDA1360TS

Table 1 Application modes using input gain stage

RESISTOR

(12 kΩ)

Present

Present

Absent

Absent

INPUT GAIN

SWITCH

0 dB

6 dB

0 dB

6 dB

MAXIMUM INPUT

VOLTAGE

2 V (RMS)

1 V (RMS)

1 V (RMS)

0.5 V (RMS)

Multiple format output interface

The UDA1360TS supports the following data output

formats:

• I2S-bus with data word length of up to 20 bits

• MSB-justified serial format with data word length of up to

20 bits.

The output format can be set by the static SFOR pin. When

SFOR is LOW, the I2S-bus is selected, when SFOR is set

HIGH the MSB-justified format is selected.

The data formats are illustrated in Fig.4. Left and right data

channel words are time multiplexed.

Decimation filter

The decimation from 128fs is performed in two stages.

The first stage realizes 3rd-order sin x/x characteristic.

This filter decreases the sample rate by 16. The second

stage (an FIR filter) consists of 3 half-band filters, each

decimating by a factor of 2.

Mute

On recovery from power-down, the serial data output

DATAO is held LOW until valid data is available from the

decimation filter. This time tracks with the sampling

frequency:

t = 1----2---f2--s--8---8-- = 279 ms ; where fs = 44.1 kHz.

Power-down mode

The PWON pin can control the power saving together with

the optional gain switch for 2 V (RMS) or 1 V (RMS) input.

When the PWON pin is set LOW, the ADC is set to

power-down. When PWON is set to HIGH or to half the

power supply, then either 6 dB gain or 0 dB gain in the

analog front-end is selected.

Application modes

The UDA1360TS can be set to different modes using two

3-level pins and one 2-level pin. The selection of modes is

given in Table 3.

Table 3 Mode selection summary

PIN

SFOR

PWON

FSEL

VSS

1⁄2VDD

I2S-bus

test mode

power-down 0 dB gain

256fs

−

VDD

MSB

6 dB gain

384fs

Table 2 DC cancellation filter characteristics

ITEM

CONDITION

Pass-band ripple

Pass-band gain

Stop band

Droop

Attenuation at DC

Dynamic range

>0.55fs

at 0.00045fs

at 0.00000036fs

0 to 0.45fs

VALUE

(dB)

none

0

−60

0.031

>40

>110

2001 Mar 14

5

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