Datasheet

PCM3070
SLAS724 – FEBRUARY 2011 www.ti.com
Electrical Characteristics, ADC (continued)
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
Input signal level (0dB) Differential Input, CM=0.9V 10 mV
1kHz sine wave input
Differential configuration
IN1L and IN1R routed to Right ADC
IN2L and IN2R routed to Left ADC
Device Setup
R
in
=10K, f
s
=48kHz, AOSR=128
MCLK = 256* f
s
PLL Disabled
AGC = OFF, Channel Gain=40dB Processing
Block = PRB_R1,
ICN Idle-Channel Noise, A-weighted
(3) (4)
Inputs ac-shorted to ground, input referred 2 μV
RMS
noise
AUDIO ADC
1kHz sine wave input –0.05 dB
Single-ended configuration
R
in
= 20K f
s
= 48kHz, AOSR=128,
Gain Error
MCLK = 256* f
s
, PLL Disabled
AGC = OFF, Channel Gain=0dB
Processing Block = PRB_R1,
1kHz sine wave input at -3dBFS 108 dB
Single-ended configuration
IN1L routed to Left ADC
Input Channel Separation
IN1R routed to Right ADC, R
in
= 20K
AGC = OFF, AOSR = 128,
Channel Gain=0dB, CM=0.9V
1kHz sine wave input at –3dBFS on IN2L, 115 dB
IN2L internally not routed.
Input Pin Crosstalk
IN1L routed to Left ADC
ac-coupled to ground
1kHz sine wave input at –3dBFS on IN2R,
IN2R internally not routed.
IN1R routed to Right ADC
ac-coupled to ground
Single-ended configuration R
in
= 20K,
AOSR=128 Channel, Gain=0dB, CM=0.9V
217Hz, 100mVpp signal on AVdd, 55 dB
PSRR Single-ended configuration, Rin=20K,
Channel Gain=0dB; CM=0.9V
Single-Ended, Rin = 10K, PGA gain set to 0 dB
0dB
Single-Ended, Rin = 10K, PGA gain set to 47.5 dB
47.5dB
Single-Ended, Rin = 20K, PGA gain set to –6 dB
0dB
ADC programmable gain amplifier gain
Single-Ended, Rin = 20K, PGA gain set to 41.5 dB
47.5dB
Single-Ended, Rin = 40K, PGA gain set to –12 dB
0dB
Single-Ended, Rin = 40K, PGA gain set to 35.5 dB
47.5dB
(3) 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.
(4) 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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