ASAHI KASEI

[AK4522]

M0020-E-01

1998/10

- 5 -

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=470

Ω

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

k

Ω

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

k

Ω

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.