hi5703 Intersil Corporation, hi5703 Datasheet - Page 15

• Manufacturer Part Number: hi5703
• Description: 10-bit, 40 Msps A/d Converter
• Manufacturer: Intersil Corporation

NOTES:
Dynamic Performance Definitions
Fast Fourier Transform (FFT) techniques are used to evaluate
the dynamic performance of the HI5703. A low distortion sine
wave is applied to the input, it is coherently sampled, and the
output is stored in RAM. The data is then transformed into the
frequency domain with an FFT and analyzed 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.
SNR and SINAD are quoted in dB. The distortion numbers are
quoted in dBc (decibels with respect to carrier) and DO NOT
include any correction factors for normalizing to full scale.
Effective Number Of Bits (ENOB)
The effective number of bits (ENOB) is calculated from the
SINAD data by:
ENOB = (SINAD - 1.76 + V
where: V
V
fullscale.
Signal To Noise and Distortion Ratio (SINAD)
SINAD is the ratio of the measured RMS signal to RMS sum
of all the other spectral components below the Nyquist
frequency, f
Signal To Noise Ratio (SNR)
SNR is the ratio of 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 below f
excluding the fundamental, the first five harmonics and DC.
+Full Scale (+FS) -
1
+FS
+
-
-FS + 1
-Full Scale (-FS)
+
8. The voltages listed above represent the ideal center of each output code shown as a function of the reference voltage.
9. V
1
CORR
CODE CENTER
/
3
DESCRIPTION
4
/
3
/
4
4
/
LSB
4
LSB
-
LSB
REF
LSB
1
3
1
adjusts the ENOB for the amount the input is below
/
/
+ = 3.25V and V
4
4
LSB
CORR
LSB
S
/2, excluding DC.
= 0.5 dB
INPUT VOLTAGE
DIFFERENTIAL
(V
-1.24573V
-1.24817V
-0.610mV
1.24939V
1.24695V
REF
IN
1.83mV
+ - V
4-15
- = 2.0V.
CORR
IN
-)
) / 6.02
D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
M
B
S
1
1
1
0
0
0
1
1
0
1
0
0
OFFSET BINARY OUTPUT CODE
1
1
0
1
0
0
S
TABLE 2. A/D CODE TABLE
1
1
0
1
0
0
/2
(DFS LOW)
1
1
0
1
0
0
1
1
0
1
0
0
1
1
0
1
0
0
Total Harmonic Distortion (THD)
THD is the ratio of the RMS sum of the first 5 harmonic
components to the RMS value of the fundamental input
signal.
2nd and 3rd Harmonic Distortion
This is the ratio of the RMS value of the applicable harmonic
component to the RMS value of the
Spurious Free Dynamic Range (SFDR)
SFDR is the ratio of the fundamental RMS amplitude to the
RMS amplitude of the next largest spectral component in the
spectrum below f
Intermodulation Distortion (IMD)
Nonlinearities in the signal path will tend to generate
intermodulation products when two tones, f
present at the inputs. The ratio of the measured signal to the
distortion terms is calculated. The terms included in the
calculation are (f
(f
below full scale.
Transient Response
Transient response is measured by providing a full scale
transition to the analog input of the ADC and measuring the
number of cycles it takes for the output code to settle within
10-bit accuracy.
Over-Voltage Recovery
Over-Voltage Recovery is measured by providing a full scale
transition to the analog input of the ADC which overdrives
the input by 200mV, and measuring the number of cycles it
takes for the output code to settle within 10-bit accuracy.
1
1
0
1
0
0
1
+2f
2
1
1
0
1
0
0
), (f
1
L
S
B
1
0
0
1
1
0
-2f
2
M
S
B
). The ADC is tested with each tone 6dB
0
0
0
1
1
1
S
1
+f
/2.
TWO’S COMPLEMENT OUTPUT CODE
2
1
1
0
1
0
0
), (f
1
1
1
0
1
0
0
-f
2
), (2f
1
1
0
1
0
0
(DFS HIGH)
1
), (2f
1
1
0
1
0
0
fundamental input signal
2
1
1
0
1
0
0
), (2f
1
1
1
0
1
0
0
1
and f
+f
2
1
1
0
1
0
0
), (2f
2
, are
1
1
0
1
0
0
1
-f
2
),
L
S
B
1
0
0
1
1
0
.