Wolfson WM8580, Instruction Manual

Page: 11 / 103

Production Data
WM8580
w
PD, Rev 4.7, March 2009
11
Test Conditions
AVDD, PVDD, VREFP = 5V, DVDD = 3.3V, AGND, VREFN = 0V, PGND, DGND = 0V, T
A
= +25
o
C, 1kHz Signal, fs = 48kHz, 24-
Bit Data, Slave Mode, MCLK, ADCMCLK = 256fs, 1V
rms
Input Signal Level unless otherwise stated.
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Analogue Reference Levels
Reference voltage V
VMID
VREFP/2 –
50mV
VREFP/2 VREFP/2 +
50mV
V
VREFP to VMID and
VMID to VREFN
VMIDSEL = 1
14 k Ω Potential divider resistance R
VMID
VREFP to VMID and
VMID to VREFN
VMIDSEL = 0
44 k Ω
S/PDIF Transceiver Performance
Jitter on recovered clock
50 ps
S/PDIF Input Levels CMOS MODE
Input LOW level V
IL
0.3 X DVDD V
Input HIGH level V
IH
0.7 X DVDD V
Input capacitance 1.25 pF
Input Frequency 36 MHz
S/PDIF Input Levels Comparator MODE
Input capacitance 10 pF
Input resistance 23 k Ω
Input frequency 25 MHz
Input Amplitude 200 0.5 X DVDD mV
PLL
Period Jitter 80 ps(rms)
XTAL
Input XTI LOW level VX
IL
0 557 mV
Input XTI HIGH level VX
IH
853 mV
Input XTI capacitance C
XJ
3.32 4.491 pF
Input XTI leakage IX
leak
28.92 38.96 mA
Output XTO LOW VX
OL
15pF load capacitors 86 278 mV
Output XTO HIGH VX
OH
15pF load capacitors 1.458 1.942 V
Supply Current
Analogue supply current AVDD, VREFP = 5V 45 mA
Analogue supply current AVDD, VREFP = 3.3V 30 mA
Digital supply current DVDD = 3.3V 25 mA
Power Down 500 µ A
Notes:
1. Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured ‘A’
weighted.
2. All performance measurements done with 20kHz low pass filter, and where noted an A-weight filter. Failure to use
such a filter will result in higher THD+N and lower SNR and Dynamic Range readings than are found in the Electrical
Characteristics. The low pass filter removes out of band noise; although it is not audible, it may affect dynamic
specification values.
3. VMID decoupled with 10uF and 0.1uF capacitors (smaller values may result in reduced performance).
4. PSSR measured with VMID set to high impedance
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