
ASAHI KASEI
[AK4520A]
0163-E-00
1997/3
- 5 -
ANALOG CHARACTERISTICS
  (Ta=25
°
C; VA,VD=5.0V; AGND=DGND=0V; VREFH=VA; VREFL=AGND; fs=44.1kHz; SCLK=64fs,
    Signal Frequency=1kHz; 20bit Data; Measurement frequency=10Hz
~
20kHz; unless otherwise specified)
Parameter
 ADC Analog Input Characteristics:   Differential Inputs; Analog Source Impedance=470
 Resolution
 S/(N+D)       (-0.5dB Input)
                                               (Note 3 )
 VA=5V
 DR (-60dB Input, A-Weighted)
                                              (Note 4 )
 VA=5V
 S/N              (A-Weighted)
                                              (Note 4 ,5 )
 VA=5V
 Interchannel Isolation
 Interchannel Gain Mismatch
 Gain Drift
 Input Voltage
       AIN=0.6x(VREFH-VREFL)
 VA=5V
 Input Resistance
 Power Supply Rejection            (Note 6 )
 DAC Analog Output Characteristics:
 Resolution
 S/(N+D)
 VA=3V
 VA=5V
 DR (-60dB Output, A-Weighted)
                                                (Note 4 )
 VA=5V
 S/N           (A-Weighted)
                                            (Note 7,5 )
 VA=5V
 Interchannel Isolation
 Interchannel Gain Mismatch
 Gain Drift
 Output Voltage
       AOUT=0.626x(VREFH-VREFL)
 VA=5V
 Load Resistance
 Load Capacitance
 Power Supply Rejection           (Note 6  )
 Note: 3 . In case of single ended input, S/(N+D)=84dB(typ, @VA=5V).
4 . In case of 16bit, DR and S/N of ADC are 98dB. DR of DAC is 98dB.
5 . S/N measured by CCIR-ARM is 96dB at each converter and 94dB at ADC to DAC loopback.
6 . PSR is applied to VA,VD with 1kHz, 50mVpp. VREFH/VREFL pin is held a constant voltage.
7 . As the input data is "0", S/N is 100dB regardless of resolution.
min
typ
max
Units
20
Bits
dB
dB
dB
dB
dB
dB
dB
dB
 VA=3V
80
84
90
94
90
94
90
86
90
96
100
96
100
110
0.1
20
1.8
3.0
30
50
 VA=3V
 VA=3V
0.3
ppm/
°
C
Vpp
Vpp
k
dB
 VA=3V
1.7
2.85
20
1.9
3.15
20
Bits
dB
dB
dB
dB
dB
dB
dB
dB
84
80
92
96
92
96
90
90
90
96
100
96
100
110
0.1
20
1.88
3.13
 VA=3V
 VA=3V
0.3
ppm/
°
C
Vpp
Vpp
k
pF
dB
 VA=3V
1.76
2.94
10
1.99
3.32
25
50