AD1845 datasheet(2/40 Pages) AD

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AD1845–SPECIFICATIONS

STANDARD TEST CONDITIONS UNLESS OTHERWISE NOTED

Temperature

°C

Digital Supply (VDD)

5.0

Analog Supply (VCC)

5.0

Word Rate (FS)

kHz

Input Signal

1008

Analog Output Passband

20 Hz to 20 kHz

ADC FFT Size

2048

DAC FFT Size

8192

VIH

VIL

ANALOG INPUT

Min

Typ

Max

Units

Input Voltage (RMS Values Assume Sine Wave Input)

Line

V rms

2.55

2.83

3.35

V p-p

MIC with +20 dB Gain (MGE = 1)

0.1

V rms

0.255

0.283

0.335

V p-p

MIC with 0 dB Gain (MGE = 0)

V rms

2.55

2.83

3.35

V p-p

Input Impedance*

Ω

Input Capacitance

PROGRAMMABLE GAIN AMPLIFIER–ADC

Min

Typ

Max

Units

Step Size (All Steps Tested)

(0 dB to 22.5 dB)

0.7

1.5

1.9

PGA Gain Range Span

21.5

22.5

23.5

AUXILIARY LINE, MONO, AND MICROPHONE INPUT ANALOG GAIN/AMPLIFIERS/ATTENUATORS

Min

Typ

Max

Units

Step Size : AUX1, AUX2, LINE, MIC (All Steps Tested)

(+12 dB to –30 dB)

1.25

1.5

1.75

(–31.5 dB to –34.5 dB)

1.5

2.0

Step Size: M_IN (All Steps Tested)

(0 dB to –39 dB)

2.5

3.0

3.6

(–42 dB to –45 dB)

2.2

3.0

3.85

Input Gain/Attenuation Range: AUX1, AUX2, LINE, MIC

45.0

46.5

49.0

Input Gain/Attenuation Range: M_IN

DIGITAL DECIMATION AND INTERPOLATION FILTERS*

Min

Max

Units

Passband

0.4

× F

Passband Ripple

±0.1

Transition Band

0.4

× F

0.6

× F

Stopband

0.6

× F

∞

Stopband Rejection

Group Delay

15/FS

Group Delay Variation Over Passband

0.0

µs

*Guaranteed, not tested.

DAC Test Conditions

Calibrated

0 dB Relative to Full Scale

16-Bit Linear Mode

10 k

Ω Output Load

Mute Off, OL = 0

ADC Test Conditions

Calibrated

0 dB Gain

–1.0 dB Relative to Full Scale

Line Input

16-Bit Linear Mode

REV. C

–2–

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