ASAHI KASEI
[AK4522]
ANALOG CHARACTERISTICS
(Ta=25°C; VA, VD=5V; AGND, DGND=0V; VREFH=VA; fs=44.1kHz; SCLK=64fs;
Signal Frequency =1kHz; 20bit Data; Measurement Frequency=10Hz
∼
20kHz; unless otherwise specified)
Parameter
min
typ
max
Units
ADC Analog Input Characteristics: Differential Inputs; Analog Source Impedance=470Ω
Resolution
20
Bits
S/(N+D)
(-0.5dB Input)
(Note 4)
84
92
dB
DR
(-60dB Input, A-Weighted)
(Note 5)
94
100
dB
S/N
(A-Weighted)
(Note 5, 6)
94
100
dB
Interchannel Isolation
90
110
dB
Interchannel Gain Mismatch
0.1
0.3
dB
Gain Drift
20
ppm/°C
Input Voltage
(AIN=0.6 x VREFH)
(Note 7)
2.85
3.0
3.15
Vpp
Input Resistance
20
30
kΩ
Power Supply Rejection
(Note 8)
50
dB
DAC Analog Output Characteristics:
Resolution
20
Bits
S/(N+D)
80
90
dB
DR
(-60dB Output, A-Weighted)
(Note 5)
95
100
dB
S/N
(A-Weighted)
(Note 6, 9)
95
100
dB
Interchannel Isolation
90
110
dB
Interchannel Gain Mismatch
0.2
0.5
dB
Gain Drift
20
ppm/°C
Output Voltage
(AOUT=0.6 x VREFH)
2.65
2.9
3.15
Vpp
Load Resistance
5
kΩ
Load Capacitance
25
pF
Power Supply Rejection
(Note 8)
50
dB
Power Supplies
Power Supply Current (VA=VD=5V)
Analog, VA PD =”H”
42
55
mA
Digital, VD PD =”H”
10
20
mA
Note: 4. In case of single ended input, S/(N+D)=80dB(typ, @VA=5V).
5. In case of 16bit, DR and S/N of ADC are 98dB. DR of DAC is 98dB.
6. S/N measured by CCIR-ARM is 96dB at each converter and 94dB at ADC to DAC loopback.
7. Full scale input for each AIN+/- pin is 1.5Vpp in differential mode.
8. PSR is applied to VA, VD with 1kHz, 50mVpp. VREFH pin is held a constant voltage.
9. As the input data is “0”, S/N is 100dB regardless of resolution.
M0020-E-01
-5-
1998/10
AKM [ ASAHI KASEI MICROSYSTEMS ]
