AK7750 Datasheet, PDF (14/77 Pages) Asahi Kasei Microsystems – Audio DSP with Built-in Hands-Free Phone Features

[ASAHI KASEI]
[AK7750]
Electric characteristics
(1) Analog characteristics
(Unless otherwise specified, Ta = 25°C; AVDD, DVDD = 3.3V; VREF=AVDD, VREFL=AVSS,
BITCLK = 64 fs; Signal frequency 1 kHz; measuring frequency = 20 Hz to 20 kHz @48kHz;
ADC with all differential inputs XTI=12.288MHz; CKSX=”H”; SMODE=”H”);
Parameter
Min
Typ
Max
ADC
Resolution
24
Section Dynamic characteristics
S/(N+D) fs = 48kHz (-1dBFS) (note1)
80
91
Dynamic range
fs = 48kHz (A filter)
(note2)
90
98
S/N fs = 48kHz (A filter)
90
98
Inter-channel isolation (f =1 kHz) (note3)
90
105
DC accuracy
Inter-channel gain mismatching
0.1
0.3
Analog input
Input voltage
(Note 4)
±1.22
±1.32
±1.42
Input impedance
(Note 5)
95
DAC
Resolution
24
section Dynamic characteristics
S/(N+D)
fs = 48kHz (0 dB)
78
86
Dynamic range fs = 48kHz(-60 dB)
90
98
(A filter) (Note 2)
S/N
fs = 48kHz (A filter)
90
98
Inter-channel isolation (f = 1 kHz)
90
105
DC accuracy
Inter-channel gain mismatching
0.2
0.5
Analog output
Output voltage
(Note 6)
1.85
2.00
2.15
Load resistance
10
Load capacitance
50
Units
Bits
dB
dB
dB
dB
dB
Vp-p
kΩ
Bits
dB
dB
dB
dB
dB
Vp-p
kΩ
pF
Note:
1. When using single-ended inputs, this value is not guaranteed.
2. Indicates S/(N+D) when -60 dB signal is applied.
3. Inter-channel isolation between L-ch and R-ch at –1 dB FS signal input.
4. The full scale for analog input voltage (∆AIN = (AIN+) - (AIN-)) can be represented by
(±FS = ±(VREFH-VREFL) × 0.4).
5. Impedance is in inverse proportion to fs.
6. Full scale output voltage at VREFH = AVDD, VREFL = AVSS
[MS0296-E-00]
14
2005/03