AK7770EQ Datasheet, PDF (13/22 Pages) Asahi Kasei Microsystems – Audio DSP with Multi-Channel Audio CODEC

[AK7770]
POWER CONSUMPTION
(Ta=25°C; AVDD=HVDD=DVDD=3.0~3.6V(typ=3.3V, max=3.6V); DVDD18=1.7~1.9V(typ=1.8V, max=1.9V);
VSS1= VSS2 = VSS3=0V)
Parameter
min
typ
max
Units
Power Supply
Power supply electric current
Normal Operation
AVDD
HVDD
DVDD
DVDD18 (Note 18)
AVDD+HVDD+DVDD
Reset (INITRSTN pin = “L” reference data)
75
-
mA
6
-
mA
5
-
mA
58
85
mA
120
mA
AVDD+HVDD+DVDD+DVDD18 (Note 19)
2
-
mA
Note 18. DVDD18 value varies with use frequency and DSP program contents.
Note 19. This is a reference value when using a crystal oscillator.
Since most of the supply current at the initial reset state is in the oscillator section, the value may vary slightly
according to the crystal type and the external circuit. This is a “reference data” only.
DIGITAL FILTER CHARACTERISTICS
■ ADC1/2
(Ta=-10°C ~70°C; AVDD=DVDD=3.0~3.6V; DVDD18=1.7~1.9V; VSS1 = VSS2 = VSS3=0V; fs=48kHz; Note 20)
Parameter
Symbol
min
typ
max
Units
PassBand (±0.1dB)
(Note 21)
PB
0
18.9
kHz
(-0.2dB)
20.0
kHz
(-3.0dB)
23.0
kHz
Stopband
SB
28
kHz
Passband Ripple
(Note 21)
PR
±0.04
dB
Stop band attenuation
(Note 22, Note 23)
SA
68
dB
Group Delay deviation
∆GD
0
μs
Group Delay (Ts=1/fs)
GD
16
Ts
Digital filter + analog filter
Amplitude characteristic
±0.5
dB
20Hz~20.0kHz (Note 24)
Note 20. Frequency of each amplitude characteristic is in proportion to fs (sampling rate). The characteristic of the high
pass filter is not included.
Note 21. The passband is from DC to 18.9kHz when fs=48kHz.
Note 22. Attenuation frequency is 48kHz to 3.044MHz when fs=48kHz.
Note 23. When fs = 48kHz, the analog modulator samples the input signal at 3.072MHz. There is no attenuation of an
input signal in band (n x 3.072MHz ± 21.99kHz; n=0, 1, 2, 3…) of integer times the sampling frequency of the
digital filter.
Note 24. Value through Pre-Amp and ADC. External input resistance is 47kΩ, and feedback resistance is 16kΩ.
MS0699-E-01-PB
- 13 -
2008/06