ADSP-BF504BCPZ-3F Analog Devices Inc, ADSP-BF504BCPZ-3F Datasheet - Page 60

• Manufacturer Part Number: ADSP-BF504BCPZ-3F
• Description: Blackfin W/Processor & Executable Flash
• Manufacturer: Analog Devices Inc
• Series: Blackfin®r
• Type: Fixed Pointr

Specifications of ADSP-BF504BCPZ-3F

• Interface: CAN, EBI/EMI, I²C, IrDA, PPI, SPI, SPORT, UART/USART
• Clock Rate: 300MHz
• Non-volatile Memory: FLASH (16MB)
• On-chip Ram: 68kB
• Voltage - I/o: 3.30V
• Voltage - Core: 1.29V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: *
• Package / Case: *
• Rohs Compliant: YES
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADSP-BF504/ADSP-BF504F/ADSP-BF506F
ADC—TERMINOLOGY
Differential Nonlinearity (DNL)
Integral Nonlinearity (INL)
Offset Error
Offset Error Match
Gain Error
Gain Error Match
Positive Gain Error
Positive Gain Error Match
Zero Code Error
Zero Code Error Match
Negative Gain Error
Differential nonlinearity is the difference between the mea-
sured and the ideal 1 LSB change between any two adjacent
codes in the ADC.
Integral nonlinearity is the maximum deviation from a
straight line passing through the endpoints of the ADC trans-
fer function. The endpoints of the transfer function are zero
scale with a single (1) LSB point below the first code transi-
tion, and full scale with a 1 LSB point above the last code
transition.
Offset error applies to straight binary output coding. It is the
deviation of the first code transition (00 . . . 000) to
(00 . . . 001) from the ideal (AGND + 1 LSB).
Offset error match is the difference in offset error across all 12
channels.
Gain error applies to straight binary output coding. It is the
deviation of the last code transition (111 . . . 110) to
(111 . . . 111) from the ideal (V
is adjusted out. Gain error does not include reference error.
Gain error match is the difference in gain error across all 12
channels.
This applies when using twos complement output coding
with, for example, the 2 × V
biased about the V
transition (011…110) to (011…111) from the ideal
(+V
This is the difference in positive gain error across all 12
channels.
Zero code error applies when using twos complement output
coding with, for example, the 2 × V
+V
mid-scale transition (all 0s to all 1s) from the ideal V
(V
Zero code error match refers to the difference in zero code
error across all 12 channels.
This applies when using twos complement output coding
option, in particular the 2 × V
+V
first code transition (100…000) to (100…001) from the ideal
(that is, –V
out.
REF
REF
REF
REF
).
biased about the V
biased about the V
– 1 LSB) after the zero code error is adjusted out.
REF
+ 1 LSB) after the zero code error is adjusted
REF
point. It is the deviation of the last code
REF
REF
REF
point. It is the deviation of the
point. It is the deviation of the
REF
REF
input range as –V
input range as –V
1 LSB) after the offset error
REF
input range as –V
Rev. 0 | Page 60 of 80 | December 2010
REF
REF
IN
to +V
voltage
to
REF
REF
to
Negative Gain Error Match
Track-and-Hold Acquisition Time
Signal-to-(Noise + Distortion) Ratio (SINAD)
Total Harmonic Distortion (THD)
Effective Number of Bits (ENOB)
Peak Harmonic or Spurious Noise (SFDR)
Channel-to-Channel Isolation
This is the difference in negative gain error across all 12
channels.
The track-and-hold amplifier returns to track mode after the
end of conversion. Track-and-hold acquisition time is the
time required for the output of the track-and-hold amplifier
to reach its final value, within ±1/2 LSB, after the end of
conversion.
This ratio is the measured ratio of signal-to-(noise + distor-
tion) at the output of the ADC. The signal is the rms
amplitude of the fundamental. Noise is the sum of all non-
fundamental signals up to half the sampling frequency (f
excluding dc. The ratio is dependent on the number of quan-
tization levels in the digitalization process; the more levels,
the smaller the quantization noise. The theoretical signal-to-
(noise + distortion) ratio for an ideal N-bit converter with a
sine wave input is given by:
Therefore, for a 12-bit converter, theoretical SINAD is 74 dB.
Total harmonic distortion is the ratio of the rms sum of har-
monics to the fundamental. For the ADC, it is defined as:
where:
V
V
through the sixth harmonics.
This is a figure of merit which characterizes the dynamic per-
formance of the ADC at a specified input frequency and
sampling rate. ENOB is expressed in bits. For a full scale sinu-
soidal input, ENOB is defined as:
Peak harmonic, or spurious noise, is defined as the ratio of
the rms value of the next largest component in the ADC out-
put spectrum (up to f
fundamental. Normally, the value of this specification is
determined by the largest harmonic in the spectrum, but for
ADCs where the harmonics are buried in the noise floor, it is
a noise peak.
Channel-to-channel isolation is a measure of the level of
crosstalk between channels. It is measured by applying a full-
scale (2 × V
10 kHz sine wave signal to all un-selected input channels and
1
2
, V
is the rms amplitude of the fundamental.
Signal-to-(Noise + Distortion) = (6.02N + 1.76) dB
ENOB = (SINAD – 1.76)/6.02
3
, V
THD
4
, V
REF
(
5
dB
, and V
when V
)
20
6
S
log
are the rms amplitudes of the second
/2, excluding dc) to the rms value of the
DD
= 5 V, V
V
2
2
V
3
REF
2
when V
V
V
1
4
2
V
5
DD
2
= 3 V),
V
6
2
S
/2),