WM8776SEFT/V Wolfson Microelectronics, WM8776SEFT/V Datasheet - Page 7

• Manufacturer Part Number: WM8776SEFT/V
• Description: Audio CODECs Stereo CODEC with 5-Ch Mux
• Manufacturer: Wolfson Microelectronics

Specifications of WM8776SEFT/V

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TQFP-48
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Production Data
Notes:
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TERMINOLOGY
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w
Test Conditions
AVDD = 5V, DVDD = 3.3V, AGND = 0V, DGND = 0V, T
ADC Channel Separation
Programmable Gain Step Size
Programmable Gain Range
(Analogue)
Programmable Gain Range
(Digital)
Analogue Mute Attenuation
(Note 6)
Power Supply Rejection Ratio
Analogue Input (AIN) to Analogue output (VOUT) (Load=10kΩ, 50pF, gain = 0dB) Bypass Mode
0dB Full scale output voltage
SNR (Note 1)
THD
Power Supply Rejection Ratio
Mute Attenuation
Supply Current
Analogue supply current
Digital supply current
Aux Input (AUX/L/R) to Analogue output (VOUT L/R)( Load=10kΩ, 50pF, gain = 0dB)
SNR
THD
with no signal applied. (No Auto-zero or Automute function is employed in achieving these results).
Normally a THD+N measurement at 60dB below full scale. The measured signal is then corrected by adding the 60dB
to it. (e.g. THD+N @ -60dB= -32dB, DR= 92dB).
Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured ‘A’
weighted.
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.
VMID decoupled with 10uF and 0.1uF capacitors (smaller values may result in reduced performance).
Harmonic distortion on the headphone output decreases with output power.
All performance measurement done using certain timings conditions (Please refer to section ‘Digital Audio Interface’).
A full digital MUTE can be achieved if the ADC gain (LAG/RAG) is set to minimum.
Signal-to-noise ratio (dB) - SNR is a measure of the difference in level between the full scale output and the output
Dynamic range (dB) - DNR is a measure of the difference between the highest and lowest portions of a signal.
THD+N (dB) - THD+N is a ratio, of the rms values, of (Noise + Distortion)/Signal.
Stop band attenuation (dB) - Is the degree to which the frequency spectrum is attenuated (outside audio band).
PSRR
PSRR
1kHz Input, 0dB gain
1kHz 100mVpp
20Hz to 20kHz
1kHz, -1dBFs
1kHz 100mVpp
20Hz to 20kHz
DVDD = 3.3V
A
1kHz, -3dB
AVDD = 5V
1kHz, 0dB
1kHz, 0dB
1kHz Input
1kHz Input
1kHz Input
100mVpp
100mVpp
= +25
o
C, fs = 48kHz, MCLK = 256fs unless otherwise stated.
0.25
-103
-21
99
AVDD/5
1.0 x
103
100
-93
-95
108
50
45
-95
0.5
-95
90
76
50
45
48
8
PD, Rev 4.1, September 2008
-21.5
0.75
+24
-85
WM8776
Vrms
dB
mA
mA
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
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