AD1988A/AD1988B

Rev. 0 | Page 4 of 20

SPECIFICATIONS

TEST CONDITIONS

Test Conditions for the AD1988A and AD1988B are as follows, unless otherwise noted.

Analog Input/Output Conditions

Temperature at 25°C

MIC_BIAS_FILT at 5.0 V ±5%

Input signal at 1008 Hz

Analog output pass band at 20 Hz to 20 kHz

DAC Conditions

Calibrated

Output −3 dB relative to full scale

10 kΩ output load: line out tests

32 Ω output load: headphone tests

ADC Conditions

Calibrated

0 db PGA gain

Input −3.0 dB relative to full scale

Table 1.

Typ

Parameter

Conditions/Comments

Min

AD1988A/

AD1988B Max

Unit

DIGITAL DECIMATION AND INTERPOLATION FILTERS1

Pass Band

0

Pass-Band Ripple

±0.005 dB

Stop Band

Hz

Stop Band Rejection

−100

dB

Group Delay

20

Group Delay Variation over Pass Band

0

μs

ANALOG-TO-DIGITAL CONVERTERS

Resolution1

24

Bits

Gain Error

Full-scale span relative to nominal input

voltage

±10

%

Interchannel Gain Mismatch

Difference of gain errors

±0.2

±0.5

dB

ADC Offset Error

±5

mV

ADC Crosstalk1

Line Inputs

Input L, Ground R, Read R;

Input R, Ground L, Read L

−85

dB

LINE_IN to Other

−100

−80

dB

DIGITAL-TO-ANALOG CONVERTERS

Resolution1

24

Bits

Gain Error

Full-scale span relative to nominal input

voltage

±10

%

Interchannel Gain Mismatch

Difference of gain errors

±0.2

±0.5

dB

Total Out-of-Band Energy 1

To 100 kHz

−85

dB

DAC Crosstalk1

Input L, Zero R, Read R;

Input R, Zero L, Read L

−95

dB

DAC VOLUMES—PROGRAMMABLE GAIN ATTENUATOR

Step Size

DAC_0, DAC_1, DAC_2, DAC_3, DAC_4

+1.5

dB

Output Gain/Attenuation Range

−58.5

0

dB

ADC VOLUMES—PROGRAMMABLE GAIN

AMPLIFIER/ATTENUATOR

Step Size

ADCSEL_0, ADCSEL_1, ADCSEL_2

+1.5

dB

PGA Gain/Attenuation Range

−58.5

+22.5

dB

ANALOG MIXER—PROGRAMMABLE GAIN

AMPLIFIER/ATTENUATOR

Signal-to-Noise Ratio (SNR)1, 2

Input to output (including CD in)

95/96

Step Size

All mixer inputs

+1.5

dB

Input Gain/Attenuation Range

All mixer inputs

−34.5

+12.0

dB