WM8740 Wolfson Microelectronics plc, WM8740 Datasheet - Page 7

• Manufacturer Part Number: WM8740
• Description: 24-bit, High Performance 192khz Stereo Dac
• Manufacturer: Wolfson Microelectronics plc

WM8740
Figure 1 Audio Data Input Timing
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Test Conditions
AVDD, DVDD = 5V, AGND, DGND = 0V, T
PARAMETER
Analogue Output Levels
Output level differential
Minimum resistance load
Maximum capacitance load
Output DC level
Reference Levels
Potential divider resistance
Voltage at VMIDL/VMIDR
Notes: 1.
Test Conditions
AVDD, DVDD = 5V, AGND, DGND = 0V, T
PARAMETER
Audio Data Input Timing Information
BCKIN pulse cycle time
BCKIN pulse width high
BCKIN pulse width low
BCKIN rising edge to
LRCIN edge
LRCIN rising edge to
BCKIN rising edge
DIN setup time
DIN hold time
BCKIN
LRCIN
2.
DIN
Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured ‘A’
weighted over a 20Hz to 20kHz bandwidth.
All performance measurements done with 20kHz low pass 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.
SYMBOL
SYMBOL
t
t
t
BCH
t
t
BCY
BCL
t
t
DS
DH
BL
LB
t
BCH
A
A
= +25
= +25
AVDD to VMIDL/VMIDR and
t
BCY
Into 10kΩ, full scale 0dB,
Into 10kΩ, full scale 0dB,
To midrail or AC coupled
To midrail or AC coupled
VMIDL/VMIDR to AGND
TEST CONDITIONS
o
o
C, fs = 48kHz, SCKI = 256fs unless otherwise stated.
C, fs = 48kHz, SCKI = 256fs unless otherwise stated.
TEST CONDITIONS
(3.3V supply)
(3.3V supply)
(5V supply)
(5V supply)
5V or 3.3V
t
t
BCL
DS
t
t
DH
BL
MIN
MIN
100
40
40
20
20
20
20
t
LB
AVDD/2
AVDD/2
1.32
TYP
600
100
TYP
10
2
1
PD, Rev 4.3, August 2009
MAX
MAX
Production Data
UNIT
V
ns
ns
ns
ns
ns
ns
ns
V
UNIT
kΩ
kΩ
pF
RMS
Ω
V
RMS
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