4-1122
Static Performance Definitions
Offset, full-scale, and gain all use a measured value of the
internal voltage reference to determine the ideal plus and
minus full-scale values. The results are all displayed in
LSBs.
Offset Error (VOS)
The first code transition should occur at a level
1
/
2
LSB
above the negative full-scale. Offset is defined as the devia-
tion of the actual code transition from this point. Note that
this is adjustable to zero.
Full-Scale Error (FSE)
The last code transition should occur for a analog input that
is 1
1
/
2
LSBs below positive full scale. Full-scale error is
defined as the deviation of the actual code transition from
this point.
Differential Linearity Error (DNL)
DNL is the worst case deviation of a code width from the
ideal value of 1 LSB. The converter is guaranteed to have no
missing codes.
Integral Linearity Error (INL)
INL is the worst case deviation of a code center from a best
fit straight line calculated from the measured data.
Dynamic Performance Definitions
Fast Fourier Transform (FFT) techniques are used to
evaluate the dynamic performance of the HI1179. A low dis-
tortion sine wave is applied to the input, it is sampled, and
the output is stored in RAM. The data is then transformed
into the frequency domain with a 1024 point FFT and ana-
lyzed to evaluate the dynamic performance of the A/D. The
sine wave input to the part is -0.5dB down from full scale for
all these tests. The distortion numbers are quoted in dBc
(decibels with respect to carrier) and
DO NOT
include any
correction factors for normalizing to full scale.
Signal-to-Noise Ratio (SNR)
SNR is the measured RMS signal to RMS noise at a
specified input and sampling frequency. The noise is the
RMS sum of all of the spectral components except the
fundamental and the first five harmonics.
Signal-to-Noise + Distortion Ratio (SINAD)
SINAD is the measured RMS signal to RMS sum of all other
spectral components below the Nyquist frequency excluding
DC.
Effective Number Of Bits (ENOB)
The effective number of bits (ENOB) is derived from the
SINAD data. ENOB is calculated from:
ENOB = (SINAD - 1.76 + V
CORR
) / 6.02,
where:
V
CORR
= 0.5dB.
HA5020 (Single)
HA5022 (Dual)
HA5024 (Quad)
HA5013 (Triple)
HFA1105 (Single)
HFA1205 (Dual)
HFA1405 (Quad)
HI1179 (8-Bit)
HSP9501
HSP48410
HSP48908
HSP48901
HSP48212
HSP43881
HSP43168
HI1171 (8-Bit)
CA3338 (8-Bit)
HA5020 (Single)
HA2842 (Single)
HFA1115 (Single)
HFA1212 (Dual)
HFA1412 (Quad)
HSP9501: Programmable Data Buffer
HSP48410: Histogrammer/Accumulating Buffer, 10-Bit Pixel Resolution, 4K x 4K Frame Size
HSP48908: 2-D Convolver, 3 x 3 Kernal Convolution, 8-Bit
HSP48901: 3 x 3 Image Filter, 30MHz, 8-Bit
HSP48212: Video Mixer
HSP43881: Digital Filter, 30MHz, 1-D and 2-D FIR Filters
HSP43168: Dual FIR Filter, 10-Bit, 33MHz/45MHz
CMOS Logic Available in HC, HCT, AC, ACT and FCT.
FIGURE 27. 8-BIT VIDEO COMPONENTS
Typical Application Circuits
(Continued)
A/D
D/A
DSP/
μ
P
REFERENCE
ICL8069
AMP
AMP
HI1179