SigmaTel, Inc.
Data Sheet
STAC9721
Out-of-Band Rejection7
Group Delay
-
-
-
-
+40
dB
ms
dB
dB
dB
dB
KΩ
pF
−
1
-
+40
-
Power Supply Rejection Ratio (1kHz)
−
-70
−
−
Crosstalk between Input channels
Spurious Tone Rejection
Attenuation, Gain Step Size
Input Impedance
-
-
+100
1.5
-
15
10
-
−
Input Capacitance
−
Vrefout
-
0.5 x AVdd
V
−
Interchannel Gain Mismatch ADC
Interchannel Gain Mismatch DAC
Gain Drift
0.5
0.5
dB
dB
-
100
10
ppm/deg. C
mV
degree
K ohm
dB
DAC Offset Voltage
50
1
Deviation from Linear Phase
External Load Impedance
Mute Attenuation (Vrms input)
10
90
96
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.
42
04/07/00
04/07/00
ETC [ ETC ]
