Pentek 6210 Operating Manual page 113

SWITCHING SPECIFICATIONS
Parameter (Conditions)
Maximum Conversion Rate
2
Minimum Conversion Rate
Aperture Delay (t )
A
Aperture Uncertainty (Jitter)
ENCODE Pulsewidth High
ENCODE Pulsewidth Low
Output Delay (t ) DV +3.3 V/5.0 V
OD CC
NOTES
1
All switching specifications tested by driving ENCODE and ENCODE differentially.
2
A plot of Performance vs. Encode is shown in Figure 16 under Typical Performance Characteristics.
3
A plot of Performance vs. Duty Cycle (Encode = 65 MSPS) is shown in Figure 17 under Typical Performance Characteristics.
4 Outputs driving one LCX gate. Delay is measured from differential crossing of ENC, ENC to the time when all output data bits are within valid logic levels.
Specifications subject to change without notice.
AC SPECIFICATIONS
Parameter (Conditions)
SNR
Analog Input 2.2 MHz
@ –1 dBFS 15.5 MHz
31.0 MHz
69.0 MHz
SINAD
Analog Input 2.2 MHz
@ –1 dBFS 15.5 MHz
31.0 MHz
69.0 MHz
2
Worst Harmonic (2nd or 3rd)
Analog Input 2.2 MHz
@ –1 dBFS 15.5 MHz
31.0 MHz
69.0 MHz
2
Worst Harmonic (4th or Higher)
Analog Input 2.2 MHz
@ –1 dBFS 15.5 MHz
31.0 MHz
69.0 MHz
Multitone SFDR (w/Dither)
Eight Tones @ –20 dBFS
4
Two-Tone IMD Rejection
F1, F2 @ –7 dBFS
5
Analog Input Bandwidth
NOTES
1 All ac specifications tested by driving ENCODE and ENCODE differentially.
2
For a single test tone at –1 dBFS, the worst case spectral performance is typically limited by the direct or aliased 2nd or 3rd harmonic. If a system is designed such
that the 2nd and 3rd harmonics fall out-of-band, overall performance in the band of interest is typically improved by 5 dB. Worst Harmonic (4th or Higher) includes
4th and higher order harmonics and all other spurious components. Reference Figure 12 for more detail.
3
See Overcoming Static Nonlinearities with Dither section for details on improving SFDR performance. To measure SFDR, eight tones from 14 MHz to 18 MHz
(0.5 MHz spacing) are swept from –20 dBFS to –90 dBFS. An open channel at 16 MHz is used to monitor SFDR.
4
F1 = 14.9 MHz, F2 = 16 MHz.
5
Specification is small signal bandwidth. Plots of Performance versus Analog Input Frequency are shown in Figures 10, 11 and 12. Sampling wide bandwidths
(5 MHz–15 MHz) should be limited to 70 MHz center frequency.
Specifications subject to change without notice.
REV. 0
1
(AV = +5 V, DV
CC
Temp
Full
Full
+25°C
+25°C
3
+25°C
+25°C
4
Full
1
= +3.3 V; ENCODE & ENCODE = 65 MSPS; T
(AV = +5 V, DV
CC CC
Temp
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
3
Full
Full
+25°C
= +3.3 V; ENCODE & ENCODE = 65 MSPS; T
CC
Test
Level Min
VI 65
IV
V
V
IV 6.5
IV 6.5
IV 8.5
Test
Level Min
V
I 64
V
V
V
I 63.5
V
V
V
I 74
V
V
V
I 74
V
V
V
V
V
–3–
= –40 C, T
MIN MAX
AD6640AST
Typ Max
6.5
400
0.3
10.5 12.5
= –40 C, T = +85 C)
MIN MAX
AD6640AST
Typ Max
68
67.7
67.5
66
68
67.2
67.0
65.5
80
80
79.5
78.5
85
85
85
84
90
80
300
AD6640
= +85 C)
Units
MSPS
MSPS
ps
ps rms
ns
ns
ns
Units
dB
dB
dB
dB
dB
dB
dB
dB
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBFS
dBc
MHz