AD1985 datasheet(4/48 Pages) AD

4 / 48 page

AD1985

Rev. A | Page 4 of 48

SPECIFICATIONS

Table 1. Test Conditions, Unless Otherwise Noted

Parameter

Value/Condition

Unit

TEMPERATURE

°C

DIGITAL SUPPLY (DVDD)

3.3

ANALOG SUPPLY (AVDD)

5.0

SAMPLE RATE (fS)

kHz

INPUT SINE WAVE SIGNAL

1,008

ANALOG OUTPUT PASS BAND

20 to 20,000

Calibrated

Output –3 dB relative to full scale

10 kΩ output load: line

32 Ω output load: headphone

2 kΩ output load: center and LFE

DAC TEST CONDITIONS

47.5 kΩ output load: mono

Calibrated

0 dB PGA gain

ADC TEST CONDITIONS

Input –3 dB relative to full scale

CLOCK

24.576 MHz

ANALOG INPUT

Table 2.

Parameter

Min

Typ

Max

Unit

INPUT VOLTAGE

LINE_IN, CD, AUX, PHONE_IN

V rms

2.83

V p-p

MIC_IN with +30 dB Preamp

0.032

V rms

0.089

V p-p

MIC_IN with +20 dB Preamp

0.1

V rms

0.283

V p-p

MIC_IN with +10 dB Preamp

0.316

V rms

0.894

V p-p

MIC_IN with 0 dB Preamp

V rms

2.83

V p-p

Input Impedance1

kΩ

Input Capacitance1

7.5

MASTER VOLUME

Table 3.

Parameter

Min

Typ

Max

Unit

STEP SIZE (LINE OUT, MONO OUT, SURROUND OUT, CENTER, LFE)

1.5

OUTPUT ATTENUATION RANGE (0 dB TO −46.5 dB)

46.5

MUTE ATTENUATION OF 0 dB FUNDAMENTAL1

PROGRAMMABLE GAIN AMPLIFIER—ADC

Table 4.

Parameter

Min

Typ

Max

Unit

STEP SIZE (0 dB TO +22.5 dB)

1.5

PGA GAIN RANGE

22.5

1 Guaranteed, not tested.

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