PCM1602APT.B datasheet(39/46 Pages) TI2

39 / 46 page

S/PDIF

Receiver

Evaluation Board

DEM-DAI1602A

PCM1602A(1)

2nd-Order

Low-Pass

Filter

Band Limit

A-Weight

Filter(1)

Analyzer

and

Display

Digital

Generator

S/PDIF

Output

0% Full-Scale,

Dither Off (SNR)

–60 dB FS,

1-kHz Sine Wave

(Dynamic Range)

rms Mode

HPF = 22 Hz

LPF = 22 kHz

Option = A-Weighting(2)

B0063-04

f–3 dB = 54 kHz

fC = 1 kHz

Notch Filter

PCM1602A

www.ti.com

SLES146A – AUGUST 2005 – REVISED OCTOBER 2010

DYNAMIC RANGE

Dynamic range is specified as A-weighted THD+N measured with a –60-dBFS, 1-kHz digital sine wave stimulus

at the input of the DAC. This measurement is designed to give a good indication of how the DAC performs, given

a low-level input signal.

The measurement setup for the dynamic range measurement is shown in Figure 40, and is similar to the THD+N

test setup discussed previously. The differences include the band-limit filter selection, the additional A-weighting

filter, and the –60-dBFS input level.

(1)

Infinite-zero-detect mute disabled

(2)

Results without A-weighting are approximately 3 dB worse.

Figure 40. Test Setup for Dynamic Range and SNR Measurements

IDLE-CHANNEL SIGNAL-TO-NOISE RATIO

The SNR test provides a measure of the noise of the DAC. The input to the DAC is in all-0s data, and the DAC

infinite-zero-detect mute function must be disabled (default condition at power up for the PCM1602A). This

ensures that the delta-sigma modulator output is connected to the output amplifier circuit so that idle tones (if

present) can be observed at the output. The dither function of the digital signal generator must also be disabled

to ensure an all-0s data stream at the input of the DAC.

The measurement setup for SNR is identical to that used for dynamic range, with the exception of the input

signal level (see the notes provided in Figure 40).

DIFFERENCES BETWEEN THE PCM1602APTR AND PCM1602AMPTR

While the two devices are identical, the key difference between both orderable versions is the physical

orientation of the devices in the reel. See the appended Package Materials Information sheet for more details on

the orientation of the devices in the reels. When changing the orderable part number, remember to update the

tooling program to compensate for the different orientation.

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