User`s manual

VLSI
Solution
y
HH
VS1000+1003 VoIP Speaker Phone VSMPG
2. CHARACTERISTICS AND SPECIFICATIONS
2 Characteristics and
Specifications
2.1 Analog Characteristics
Unless otherwise noted: AVDD=2.5. . . 2.85V, CVDD=2.4. . . 2.7V,
IOVDD=CVDD-0.6V. . . 3.6V, TA=-25..+70
◦
C, XTALI=12MHz, internal clock multiplier 3.5×.
DAC tested with 1307.894 Hz full-scale output sinewave, measurement bandwidth 20. . . 14500 Hz
(VoIP mode) or 20. . . 20000 Hz (Media Player mode), analog output load: LEFT to GBUF 30 Ω,
RIGHT to GBUF 30 Ω.
Parameter Symbol Min Typ Max Unit
DAC Resolution 18 bits
Total Harmonic Distortion THD 0.1 0.3 %
Dynamic Range (DAC unmuted, A-weighted) IDR 90 dB
S/N Ratio (full scale signal) SNR 70 90 dB
Interchannel Isolation (Cross Talk) 40 dB
Interchannel Gain Mismatch -0.5 0.5 dB
Frequency Response -0.2 0.2 dB
Full Scale Output Voltage (Peak-to-peak) 1.3 1.5
1
1.7 Vpp
Deviation from Linear Phase 5
◦
Earphone Output Load Resistance AOLR 16 30
2
Ω
Earphone Output Load Capacitance 100 pF
1
This is the value directly from the VS1003 analog outputs. 10 Ω series resistors limit this
depending on the earphone impedance.
2
AOLR may be much lower, but below Typical distortion performance may be compromised.
2.2 Echo Cancellation Characteristics
Parameter Symbol Min Typ Max Unit
Attenuation ECATT 26 dB
Setup Time
1
ECSET < 1 s
Filter Length ECFLT 1024 samples
Echo Tail ECTAIL 128 ms
1
Setup can only be performed when there is only FES speech. For details see Chapter 6.
Rev. 2.12
2008-09-18
Page 6(30)