WM8985GEFL Wolfson Microelectronics, WM8985GEFL Datasheet - Page 14

• Manufacturer Part Number: WM8985GEFL
• Description: Audio CODECs Multimedia CODEC with Class D HP
• Manufacturer: Wolfson Microelectronics

Specifications of WM8985GEFL

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-32
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WM8985
TERMINOLOGY
1.
2.
3.
4.
5.
6.
w
Test Conditions
DCVDD=1.8V, AVDD1=AVDD2=DBVDD=3.3V, T
PARAMETER
Digital Input / Output
Input HIGH Level
Input LOW Level
Output HIGH Level
Output LOW Level
Input Capacitance
Input leakage
example, when AVDD1 = 3.3V, 0dBFS = 1V
with a linear relationship to AVDD.
reduced.
device output with no signal applied. This ratio is also called idle channel noise. (No Auto-zero or Automute function is
employed in achieving these results).
harmonics of the output signal. To calculate the ratio, the fundamental frequency of the output signal is notched out
and an RMS value of the next seven harmonics is calculated.
the sum of the harmonics, wide-band noise and interference on the output signal. To calculate the ratio, the
fundamental frequency of the output signal is notched out and an RMS value of the total harmonics, wide-band noise
and interference is calculated.
Full-scale input and output levels scale in relation to AVDD1 or AVDD2 depending upon the input or output used. For
Input level to RIP and LIP in differential configurations is limited to a maximum of -3dB or performance will be
Signal-to-noise ratio (dBFS) – SNR is the difference in level between a reference full scale output signal and the
Total Harmonic Distortion (dB) – THD is the difference in level between a reference output signal and the first seven
Total Harmonic Distortion plus Noise (dB) – THD+N is the difference in level between a reference output signal and
Channel Separation (dB) – Also known as Cross-Talk. This is a measure of the amount one channel is isolated from
the other. Normally measured by sending a full scale signal down one channel and measuring the other.
SYMBOL
V
V
V
V
OH
OL
IH
IL
rms
A
(0dBV). When AVDD < 3.3V the absolute level of 0dBFS will decrease
= +25
o
TEST CONDITIONS
C, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated.
All digital pins
I
I
OL
OH
=1mA
-1mA
0.7×DBV
0.9×DBV
MIN
DD
DD
TYP
10
50
PD, Rev 4.6, July 2009
0.3×DBVDD
0.1xDBVDD
MAX
Production Data
UNIT
pF
pA
V
V
V
V
14