REV. 0

–2–

AD1955–SPECIFICATIONS

ANALOG PERFORMANCE

Parameter

Min

Typ

Max

Unit

Resolution

24

Bits

SIGNAL-TO-NOISE RATIO (20 Hz to 20 kHz)

*

Differential Output (A-Weighted, RMS) (Stereo)

120

114

dB

Differential Output (A-Weighted, RMS) (Mono)

123

dB

Single-Ended (A-Weighted, RMS) (Stereo)

119

dB

DYNAMIC RANGE (20 Hz to 20 kHz, –60 dB Input)

*

Differential Output (A-Weighted, RMS) (Stereo)

120

114

dB

Differential Output (A-Weighted, RMS) (Mono)

123

dB

Single-Ended (A-Weighted, RMS) (Stereo)

119

dB

Total Harmonic Distortion + Noise (Stereo) at 0 dBFS

–110

–102.5

dB

ANALOG OUTPUTS

Differential Output Range (Full Scale)

8.64

mA p-p

Output Capacitance at Each Output Pin

100

pF

Output Bias Current, Each Output

–3.24

mA

Out-of-Band Energy (0.5

fS to 100 kHz)

–90

dB

Reference Voltage

2.245

2.39

2.505

V

DC ACCURACY

Gain Error

±6%

Interchannel Gain Mismatch

0.01

0.26

dB

Gain Drift

25

ppm/

°C

Interchannel Crosstalk (EIAJ Method)

–125

dB

Interchannel Phase Deviation

±0.1

Degrees

Mute Attenuation

–100

dB

De-Emphasis Gain Error

±0.1

dB

*Measured with Audio Precision System Two Cascade in RMS Mode. Averaging Mode will show approximately 2 dB better performance.

Performance of right and left channels are identical (exclusive of the Interchannel Gain Mismatch and Interchannel Phase Deviation specifications).

Specifications subject to change without notice.

TEST CONDITIONS

(Unless otherwise noted.)

Analog Supply Voltages (AVDD) . . . . . . . . . . . . . . . . . . . . 5 V

Digital Supply Voltages (DVDD) . . . . . . . . . . . . . . . . . . . . 5 V

Reference Current (IREF) . . . . . . . . . . . . . . . . . . . . . 0.960 mA

Ambient Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

°C

Input Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.288 MHz

Input Signal . . . . . . . . . . . . . . . . . 984.375 Hz, 0 dB Full Scale

Input Sample Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 kHz

Measurement Bandwidth . . . . . . . . . . . . . . . . 20 Hz to 20 kHz

Word Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Bits

Load Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 pF

Load Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 k

Ω

Input Voltage HI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.4 V

Input Voltage LO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 V

(See figures. IREF = 0.960 mA, VBIAS = 2.80 V.)