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1999 May 10 42
Philips Semiconductors Preliminary specification
Universal Serial Bus (USB) CODEC UDA1325
Analog PLL (for ADC clock)
f
clk(PLL)
PLL clock frequency 8.1920 11.2896 12.2880 MHz
δ duty factor − 50 − %
t
strt(PO)
start-up time after power-on −−10 ms
Power-on reset
t
su(PO)
power-on set-up-time note 1 25C
ref
(2)
−−ms
PGA and ADC
V
i(FS)(rms)
full-scale input voltage (RMS value) PGA gain = −3dB − 1414
(3)
− mV
PGA gain=0dB − 1000 − mV
PGA gain=3dB − 708 − mV
PGA gain=9dB − 355 − mV
PGA gain = 15 dB − 178 − mV
PGA gain = 21 dB − 89 − mV
PGA gain = 27 dB − 44 − mV
C
i(PGA)
input capacitance of the PGA −−20 pF
(THD + N)/S total harmonic distortion plus
noise-to-signal ratio
f
s
= 44.1 kHz at
input signal of
1 kHz; PGA
gain = 0 dB;
note 4
V
i
(0 dB)
1.0 V (RMS)
−−85 −80 dB
− 0.0056 0.01 %
V
i
(−60 dB) −−30 −20 dB
− 3.2 10.0 %
S/N signal to noise ratio V
i
= 0.0 V 90 95 − dBA
α
ct
crosstalk between channels PGA gain=0dB − 100 − dB
f
s
sample frequency (128f
s
) 0.640 − 7.04 MHz
OL digital output level PGA gain=0dB,
V
i
= 1 V (RMS)
−−2.0 − dBFS
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT