AD6640 Просмотр технического описания (PDF) - Analog Devices
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AD6640 Datasheet PDF : 24 Pages
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AD6640
SWITCHING SPECIFICATIONS1 (AVCC = +5 V, DVCC = +3.3 V; ENCODE and ENCODE = 65 MSPS; TMIN = –40؇C, TMAX = +85؇C,
unless otherwise noted.)
Parameter (Conditions)
Temp
Test
Level
AD6640AST
Min
Typ
Max
Unit
Maximum Conversion Rate
Minimum Conversion Rate2
Aperture Delay (tA)
Aperture Uncertainty (Jitter)
ENCODE Pulsewidth High3
ENCODE Pulsewidth Low
Output Delay (tOD) DVCC + 3.3 V/5.0 V4
Full
Full
+25°C
+25°C
+25°C
+25°C
Full
VI
65
MSPS
IV
6.5
MSPS
V
400
ps
V
0.3
ps rms
IV
6.5
ns
IV
6.5
ns
IV
8.5
10.5
12.5 ns
NOTES
1All switching specifications tested by driving ENCODE and ENCODE differentially.
2A plot of Performance versus ENCODE is shown in TPC 10.
3A plot of Performance versus Duty Cycle (ENCODE = 65 MSPS) is shown in TPC 11.
4Outputs driving one LCX gate. Delay is measured from differential crossing of ENCODE and ENCODE to the time when all output data bits are within valid logic levels.
Specifications subject to change without notice.
AC SPECIFICATIONS1 (AVCC = 5 V, DVCC = 3.3 V; ENCODE and ENCODE = 65 MSPS; TMIN = –40؇C, TMAX = +85؇C,
unless otherwise noted.)
Parameter (Conditions)
Temp
Test
Level
AD6640AST
Min
Typ
Max
Unit
SNR
Analog Input
@ –1 dBFS
2.2 MHz
15.5 MHz
31.0 MHz
69.0 MHz
+25°C
V
68
dB
+25°C
I
64
67.7
dB
+25°C
V
67.5
dB
+25°C
V
66
dB
SINAD
Analog Input
@ –1 dBFS
2.2 MHz
15.5 MHz
31.0 MHz
69.0 MHz
Worst Harmonic2 (2nd or 3rd)
Analog Input 2.2 MHz
@ –1 dBFS 15.5 MHz
31.0 MHz
69.0 MHz
Worst Harmonic2 (4th or Higher)
Analog Input 2.2 MHz
@ –1 dBFS 15.5 MHz
31.0 MHz
69.0 MHz
Multitone SFDR (with Dither)3
Eight Tones @ –20 dBFS
+25°C
V
68
+25°C
I
63.5
67.2
+25°C
V
67.0
+25°C
V
65.5
+25°C
V
80
+25°C
I
74
80
+25°C
V
79.5
+25°C
V
78.5
+25°C
V
85
+25°C
I
74
85
+25°C
V
85
+25°C
V
84
Full
V
90
dB
dB
dB
dB
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBFS
Two-Tone IMD Rejection4
F1, F2 @ –7 dBFS
Analog Input Bandwidth5
Full
V
+25°C
V
80
dBc
300
MHz
NOTES
1All ac specifications tested by driving ENCODE and ENCODE differentially.
2For a single test tone at –1 dBFS, the worst-case spectral performance is typically limited by the direct or aliased second or third harmonic. If a system is designed
such that the second and third harmonics fall out-of-band, overall performance in the band of interest is typically improved by 5 dB. Worst harmonic (fourth or higher)
includes fourth and higher order harmonics and all other spurious components. Reference TPC 6 for more detail.
3See 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.
4F1 = 14.9 MHz, F2 = 16 MHz.
5Specification is small signal bandwidth. Plots of Performance versus Analog Input Frequency are shown in TPCs 4, 5, and 6. Sampling wide bandwidths (5 MHz–15 MHz)
should be limited to 70 MHz center frequency.
Specifications subject to change without notice.
REV. A
–3–
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