Datasheet

PCM3070
www.ti.com SLAS724 – FEBRUARY 2011
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
ADC programmable gain amplifier step 1-kHz tone 0.5 dB
size
Electrical Characteristics, Bypass Outputs
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
ANALOG BYPASS TO HEADPHONE AMPLIFIER, DIRECT MODE
Load = 16Ω (single-ended), 50pF;
Input and Output CM=0.9V;
Device Setup Headphone Output on LDOIN Supply;
IN1L routed to HPL and IN1R routed to HPR;
Channel Gain=0dB
Gain Error –0.8 dB
Noise, A-weighted
(1)
Idle Channel, IN1L and IN1R ac-shorted to 3 μV
RMS
ground
THD Total Harmonic Distortion 446mVrms, 1kHz input signal –89 dB
ANALOG BYPASS TO LINE-OUT AMPLIFIER, PGA MODE
Load = 10kΩ (single-ended), 56pF;
Input and Output CM=0.9V;
LINE Output on LDOIN Supply;
Device Setup
IN1L routed to ADCPGA_L and IN1R routed
to ADCPGA_R; Rin = 20kΩ
ADCPGA_L routed to LOL and ADCPGA_R
routed to LOR; Channel Gain = 0dB
Gain Error 0.6 dB
Idle Channel, 7 μV
RMS
IN1L and IN1R ac-shorted to ground
Noise, A-weighted
(1)
Channel Gain=40dB, 3.4 μV
RMS
Input Signal (0dB) = 5mV
rms
Inputs ac-shorted to ground, Input Referred
(1) 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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Product Folder Link(s): PCM3070