ADSP-BF523C AD [Analog Devices], ADSP-BF523C Datasheet - Page 32

• Manufacturer Part Number: ADSP-BF523C
• Description: Blackfin Embedded Processor 289-ball MBGA package
• Manufacturer: AD [Analog Devices]

ADSP-BF523C/ADSP-BF525C/ADSP-BF527C
ELECTRICAL CHARACTERISTICS
1
2
Signal-to-noise ratio (SNR) (dB) is a measure of the difference
in level between the full scale output and the output with no sig-
nal applied.
Dynamic range (DR) (dB) is a measure of the difference
between the highest and lowest portions of a signal, normally a
THD+N measurement at 60 dB below full scale. The measured
signal is then corrected by adding the 60 dB to it. For example
THD+N @ –60 dB = –32 dB, DR = 92 dB.
Total Harmonic Distortion Plus Noise (THD+N) (dB) is a ratio
of the rms values of (Noise + Distortion)/Signal.
Parameter
Line Input to ADC
SNR
SNR
DR
THD
Microphone Input to ADC
SNR
DR
THD
Line Output for DAC Playback Only
SNR
SNR
DR
THD
THD
Analog Line Input to Line Output
SNR
THD
THD
Stereo Headphone Output
PO
PO
SNR
THD
THD
Microphone Input to Headphone Output Side Tone Mode
SNR
SNR is the ratio of output level with 1 kHz full scale input, to the output level with the input short-circuited, measured ‘A’ weighted over a 20Hz to 20 kHz bandwidth using
AVDD, HPVDD, V
an audio analyzer. Ratio of output level with 1 kHz full scale input, to the output level with all zeros into the digital input, measured ‘A’ weighted over a 20 Hz to 20 kHz
bandwidth. All performance measurements are done with a 20 kHz 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 these specifications. The low pass filter removes out of band noise; which is not audible but may affect dynamic
specification values. VMID is decoupled with 10 μF and 0.1 μF capacitors (smaller values may result in reduced performance).
1
Signal to Noise Ratio
Signal to Noise Ratio
Dynamic Range
Total Harmonic Distortion –1 dB Input, 0 dB Gain
Signal to Noise Ratio
Dynamic Range
Total Harmonic Distortion 0 dB Input, 0 dB Gain
Signal to Noise Ratio
Signal to Noise Ratio
Dynamic Range
Total Harmonic Distortion 1 kHz, 0 dB
Total Harmonic Distortion 1 kHz, –3 dB
Signal to Noise Ratio
Total Harmonic Distortion 1 kHz, 0 dB
Total Harmonic Distortion 1 kHz, –3 dB
Maximum Output Power R
Maximum Output Power R
Signal to Noise Ratio
Total Harmonic Distortion 1 kHz, –5 dB, R
Total Harmonic Distortion 1 kHz,–2 dB, R
Signal to Noise Ratio
DDEXT
= 1.8V, AGND = 0V, T
A
Conditions
A-weighted, 0 dB Gain @ f
A-weighted, 0 dB Gain @ f
A-weighted, –60 dB Full Scale Input
0 dB Gain, f
A-weighted, 0 dB Gain
A-weighted, –60 dB Full Scale Input
Load = 10 kΩ, 50 pF
A-weighted, 0 dB Gain @ f
A-weighted, 0 dB Gain @ f
A-weighted, –60 dB Full Scale Input
Load = 10 k Ω, 50 pF, No Gain on Input, Bypass Mode
A-weighted
= +25°C. Slave Mode, f
L
L
= 32 Ω
= 16 Ω
Rev. PrC | Page 32 of 44 | June 2008
S
2
= 48 kHz, 40 kΩ Source Impedance
L
L
= 32 Ω, Full Scale Input
= 32 Ω, Full Scale Input
S
= 48 kHz, XTI/CODEC_MCLK = 256 × f
S
S
S
S
= 48 kHz
= 96 kHz
= 48 kHz
= 96 kHz
Channel Separation (dB)—Also known as crosstalk. 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.
S
Preliminary Technical Data
(12.288 MHz) unless otherwise stated.
Min Typical Max Unit
tbd 85
tbd 88
tbd 95
tbd 90
tbd 90
tbd 95
tbd 90
85
–76
80
70
–55
93
–80
–90
–83
–92
9
18
–62
tbd
tbd
tbd
tbd
tbd
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
mW
mW
dB
dB
dB
dB