AD1846 datasheet(2/28 Pages) AD

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REV. A

–2–

AD1846–SPECIFICATIONS

STANDARD TEST CONDITIONS UNLESS OTHERWISE NOTED

DAC Output Conditions

Post-Autocalibrated

Temperature

°C

0 dB Attenuation

Digital Supply (VDD)

5.0

Full Scale (0 dB)

Analog Supply (VCC)

5.0

16-Bit Linear Mode

Word Rate (FS )

kHz

No Output Load

Input Signal

1007

Mute Off

Analog Output Passband

20 Hz to 20 kHz

ADC Input Conditions

FFT Size

4096

Post-Autocalibrated

VIH

2.4

0 dB Gain

VIL

0.8

–1.0 dB Relative to Full Scale

VOH

2.4

Line Input

VOL

0.4

16-Bit Linear Mode

Inputs Driven with Low Impedance (

≈ 50 Ω) Source

ANALOG INPUT

Min

Typ

Max

Units

Full Scale Input Voltage (RMS Values Assume Sine Wave Input)

Line

V rms

2.5

2.8

3.1

V p-p

Mic

V rms

MGE = 0

2.5

2.8

3.1

V p-p

MGE = 1

0.29

0.36

0.43

V p-p

Input Impedance

100

Ω

Input Capacitance

PROGRAMMABLE GAIN AMPLIFIER—ADC

Min

Typ

Max

Units

Step Size (0 dB to 22.5 dB)

1.0

1.5

2.0

(All Steps Tested)

PGA Gain Range Span

21.0

22.5

24.0

AUXILIARY INPUT ANALOG AMPLIFIERS/ATTENUATORS

Min

Typ

Max

Units

Step Size (+12 dB to –28.5 dB, Referenced to DAC Full Scale)

1.3

1.5

1.7

(–30 dB to –34.5 dB, Referenced to DAC Full Scale)

1.0

1.5

2.0

Auxiliary Gain/Attenuation Range Span

45.5

46.5

47.5

Auxiliary Input Impedance*

Ω

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