Datasheet

PCM3070
www.ti.com SLAS724 – FEBRUARY 2011
Electrical Characteristics, ADC
At 25°C, AVdd, DVdd, IOVDD = 1.8V, LDO_in = 3.3V, AVdd LDO disabled, f
s
(Audio) = 48kHz, Cref = 10 μF on REF PIN,
PLL disabled unless otherwise noted.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
AUDIO ADC
(1) (2)
Input signal level (0dB) Single-ended, CM = 0.9V 0.5 V
RMS
1kHz sine wave input
Single-ended Configuration
IN1R to Right ADC and IN1L to Left ADC,
R
in
= 20K, f
s
= 48kHz,
Device Setup
AOSR = 128, MCLK = 256*f
s
,
PLL Disabled; AGC = OFF,
Channel Gain = 0dB,
Processing Block = PRB_R1,
Inputs ac-shorted to ground 80 93
IN2R, IN3R routed to Right ADC and 93
SNR Signal-to-noise ratio, A-weighted
(1) (2)
dB
ac-shorted to ground
IN2L, IN3L routed to Left ADC and ac-shorted
to ground
DR Dynamic range A-weighted
(1) (2)
–60dB full-scale, 1-kHz input signal 92 dB
–3 dB full-scale, 1-kHz input signal –85 –70 dB
IN2R,IN3R routed to Right ADC –85
THD+N Total Harmonic Distortion plus Noise
IN2L, IN3L routed to Left ADC
–3dB full-scale, 1-kHz input signal
AUDIO ADC
Input signal level (0dB) Single-ended, CM=0.75V, AVdd = 1.5V 0.375 V
RMS
1kHz sine wave input
Single-ended Configuration
IN1R, IN2R, IN3R routed to Right ADC
IN1L, IN2L, IN3L routed to Left ADC
Device Setup R
in
= 20K, f
s
= 48kHz,
AOSR=128, MCLK = 256* f
s
,
PLL Disabled, AGC = OFF,
Channel Gain = 0dB,
Processing Block = PRB_R1
SNR Signal-to-noise ratio, A-weighted
(1) (2)
Inputs ac-shorted to ground 91 dB
DR Dynamic range A-weighted
(1) (2)
–60dB full-scale, 1-kHz input signal 90 dB
THD+N Total Harmonic Distortion plus Noise –3dB full-scale, 1-kHz input signal –80 dB
(1) Ratio of output level with 1kHz full-scale sine wave input, to the output level with the inputs short circuited, measured A-weighted over a
20Hz to 20kHz bandwidth using an audio analyzer.
(2) All performance measurements done with 20kHz low-pass filter and, where noted, A-weighted filter. Failure to use such a filter may
result in higher THD+N and lower SNR and dynamic range readings than shown in the Electrical Characteristics. The low-pass filter
removes out-of-band noise, which, although not audible, may affect dynamic specification values
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