MINIMUM CONVERSION RATE
The specification shows the maximum change in full scale fromthe value with the supply at the minimum limit to the value withthe supply at its maximum limit.
APERTURE JITTER
The clock rate at which the SNR of the lowest analog signalfrequency drops by no more than 3 dB below the guaranteed limit.
MAXIMUM CONVERSION RATE
The encode rate at which parametric testing is performed.
OUTPUT PROPAGATION DELAY
Aperture jitter is the variation in aperture delay for successivesamples and can be manifested as noise on the input to the ADC.
APERTURE DELAY
The delay between the clock logic threshold and the time whenall bits are within valid logic levels.
TWO TONE SFDR
Aperture delay is a measure of the sample-and-hold amplifier(SHA) performance and is measured from the rising edge of theclock input to when the input signal is held for conversion.
SIGNAL-TO-NOISE AND DISTORTION (S/N+D, SINAD)RATIO
The ratio of the rms value of either input tone to the rms valueof the peak spurious component. The peak spurious componentmay or may not be an IMD product. May be reported in dBc(i.e., degrades as signal levels are lowered) or in dBFS (alwaysrelated back to converter full scale).
S/N+D is the ratio of the rms value of the measured inputsignal to the rms sum of all other spectral components belowthe Nyquist frequency, including harmonics but excluding dc.The value for S/N+D is expressed in decibels.
REV. 0–7–
d.AINe.CAPT, CAPB, MODE, SENSE, VREF
Equivalent Circuits
–8–
REV. 0
AD9226
Figure 2.
Typical Performance Characteristics–AD9226
(AVDD = 5.0 V, DRVDD = 3.0 V, fSAMPLE = 65 MSPS with CLK Stabilizer Enabled, TA = 25 C, 2 V Differential Input Span, VCM = 2.5 V, AIN = –0.5 dBFS,VREF = 2.0V, unless otherwise noted.)
0–10–20
–30–40
S
–50FBd–60–70–80–90–100–110–120
FREQUENCY – MHz
TPC 1.Single-Tone 8K FFT with fIN = 5 MHz––––S
–FBd–––––––0
FREQUENCY – MHz
TPC 2.Dual-Tone 8K FFT with fIN–1 = 18 MHz andfIN–2 = 20 MHz (AIN–1 = AIN–2 = –6.5 dBFS)
––––S
–FBd–––––––0
6.5
13
19.5
26
32.5
FREQUENCY – MHz
TPC 3.Single-Tone 8K FFT with fIN = 31 MHzREV. 0c
Bd DNA SFBd–30
–15–10AIN – dBFS
TPC 4.Single-Tone SNR/SFDR vs. AIN with fIN
= 5 MHz
TPC 5.Dual-Tone SNR/SFDR vs. AIN with fIN–1 = 18MHzand fIN–2 = 20 MHz
TPC 6.Single-Tone SNR/SFDR vs. AIN with fIN = 31 MHz
–9–
AD9226
75
70
ENOB – Bits
SNR – dBc
65
SINAD – dBc
60
9.8
55
8.9
50
8.1
7.31
10
1001000FREQUENCY – MHz
TPC 7.
SINAD/ENOB vs. Frequency––––
c
Bd– – DH–T––––1
10
1001000
FREQUENCY – MHz
TPC 8.THD vs. Frequency72
70
c
B68d – RNS66
6462
1
10
1000
FREQUENCY – MHz
TPC 9.SNR vs. Temperature and Frequency1
101001000
FREQUENCY – MHz
TPC 10.
SNR vs. Frequency
9080
c
Bd – RDFS60501
10
1001000
FREQUENCY – MHz
TPC 11.SFDR vs. Frequency
–70–72–74–76
c
B–78
d – D–80HT
–82–84
–86–88
–90
1
10
100
FREQUENCY – MHz
TPC 12.THD vs. Temperature and Frequency
–10–REV. 0
105
95
Bc
d –85
CSINOMR75
AH65
55
1
10
1000
FREQUENCY – MHz
TPC 13.Harmonics vs. Frequency
95
c
Bd – R90
DFS85
80
SAMPLE RATE – MSPS
TPC 14.SFDR vs. Sample Rate
TPC 15.Typical INL
REV. 0AD9226
TPC 16.SINAD vs. Sample Rate
90
85
80
B
c
75
d
–
R
D
70
F
/
S
D
65
A
N
IS60
55
50
45
% POSITIVE DUTY CYCLE
TPC 17.
SINAD/SFDR vs. Duty Cycle @ f
IN
= 20 MHz
10.8
0.60.4
B
S0.2L – L0ND–0.2–0.4–0.6–0.8
–1
05001k1500
2k25003k35004k
CODE
TPC 18.Typical DNL
–11–
AD9226–Typical IF Sampling Performance Characteristics
(AVDD = 5.0 V, DRVDD = 3.0 V, fSAMPLE = 65 MSPS with CLK Stabilizer Enabled, TA = 25 C, 2 V Differential Input Span, VCM = 2.5 V, AIN = –6.5dBFS,VREF = 2.0V, unless otherwise noted.)
––––S
–FBd–––––––FREQUENCY – MHz
TPC 19.Dual-Tone 8K FFT with fIN–1 = 44.2 MHz andfIN–2 = 45.6 MHz––––S
–FBd–––––––FREQUENCY – MHz
TPC 20. Dual-Tone 8K FFT with fIN–1 = 69.2 MHz andfIN–2 = 70.6 MHz––––S
–FBd–––––––FREQUENCY – MHz
TPC 21.Dual-Tone 8K FFT with fIN–1 = 139.2 MHz andfIN–2 = 140.7 MHzz
H/S
FSFBBdd –– RDRFSOOL/RF NESSINOAIN – dBFS
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