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SigmaTel, Inc.
Data Sheet
STAC9721
42
04/07/00
04/07/00
Out-of-Band Rejection7
-
+40
−
dB
Group Delay
-
-
1
ms
Power Supply Rejection Ratio (1kHz)
-
+40
−
dB
Crosstalk between Input channels
-
-
-70
dB
Spurious Tone Rejection
-
+100
−
dB
Attenuation, Gain Step Size
-
1.5
−
dB
Input Impedance
10
-
−
KΩ
Input Capacitance
-
15
−
pF
Vrefout
-
0.5 x AVdd
−
V
Interchannel Gain Mismatch ADC
0.5
dB
Interchannel Gain Mismatch DAC
-
0.5
dB
Gain Drift
100
ppm/deg. C
DAC Offset Voltage
10
50
mV
Deviation from Linear Phase
1
degree
External Load Impedance
10
K ohm
Mute Attenuation (Vrms input)
90
96
dB
Notes:
1. With +20 dB Boost on, 1.0Vrms with Boost off
2. ± 1 dB limits
3. The ratio of the rms output level with 1 kHz full scale input to the rms output level with all
zeros into the digital input. Measured “A weighted” over a 20 Hz to a 20 kHz bandwidth.
(AES17-1991 Idle Channel Noise or EIAJ CP-307 Signal-to-noise Ratio).
4. 0 dB gain, 20 kHz BW, 48 kHz Sample Frequency
5. ± 0.25dB limits
6. Stop Band rejection determines filter requirements. Out-of-Band rejection determines
audible noise.
7. The integrated Out-of-Band noise generated by the DAC process, during normal PCM audio
playback, over a bandwidth 28.8 to 100 kHz, with respect to a 1 Vrms DAC output.
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