AD1803 Просмотр технического описания (PDF) - Analog Devices

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AD1803

Modem/Telephony Codec

Analog Devices 

SPECIFICATIONS

TEST CONDITIONS

Test conditions for the AD1803 are as follows, unless otherwise noted.

General Test Conditions

Temperature at 25°C

Digital supply at 3.3 V/5 V

Analog supply at 3.3 V/5 V

Sample rate (fS) at 8 kHz

Input signal at 1008 Hz

Analog output pass band at 20 Hz to 4 kHz

ADC FFT size at 512

DAC FFT size at 4096

VIH @ 2.1 V

VIL @ 1.2 V

VOH @ 2.9 V

VOL @ 0.3 V

IOH @ −2.0 mA

IOL @ +2.0 mA

DAC Output Test Conditions

0 dB attenuation relative to full scale

Input 0 dB

Mute Off

10 kΩ output load

ADC Input Test Conditions

Autocalibrated

0 dB PGA gain

Mute off

Input: 1.0 dB relative to full scale

Table 1.

Parameter

Test Conditions/Comments

Min

Typ

ADC RECEIVE PATH

Full-Scale Input Voltage1

PGA gain = 0 dB, offset error = 0% of FS

1.56

AD1803 Rx Input

0 dBm

2.1

2.2

Resistance—Rx Input2

0 dB Gain

110

+20 dB Gain

10

Capacitance—Rx Input2

15

Rx Programmable Gain

Gain Step Size3

0 dB to 42.5 dB

1.0

1.5

Input Gain Span4

41.5

42.5

Analog-to-Digital Converter

Dynamic Range5

−60 dB input, PGA gain = 0 dB

85

90

Dynamic Range2, 5

−60 dB input, PGA gain = 6 dB

90

Dynamic Range2, 5

−60 dB input, PGA gain = +12 dB

90

THD + N

−1 dB input referenced to full scale

−90

Signal-to-Intermodulation Distortion2 CCIF method

80

Offset Error

0 V analog input, PGA gain = 0 dB

1

DAC TRANSMIT PATH

Digital-to-Analog Converter

Dynamic Range5

−60 dB input, output gain = 0 dB

85

THD + N

−1 dB input referenced to full scale

−75

Signal-to-Intermodulation Distortion2 CCIF method

80

Total Out-of-Band Energy2

Measured from 0.555 × fS to 100 kHz

DC Offset

100

Programmable Gain/Attenuator

Step Size3

+12 dB to −34.5 dB

1.0

1.5

Output Attenuation Span

45.5

46.5

Full-Scale Output Voltage

Tx Output

0 dBm

2.1

2.2

Tx Pin Capacitance

15

Tx Load Capacitance

100

AD1803

Max

Unit

V rms

2.3

V p-p

kΩ

kΩ

pF

2.0

dB

43.5

dB

dB

dB

dB

−85

dB

dB

5

% of FS

dB

dB

dB

−40

dB

mV

2.0

dB

48

dB

2.3

V p-p

pF

pF

Rev. A | Page 3 of 32

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