AD6640AST Analog Devices Inc, AD6640AST Datasheet - Page 3

• Manufacturer Part Number: AD6640AST
• Description: IC ADC 12BIT 65MSPS 44-LQFP
• Manufacturer: Analog Devices Inc

Specifications of AD6640AST

• Rohs Status: RoHS non-compliant
• Function: A/D Converter
• Rf Type: Cellular/PCS, GPS
• Secondary Attributes: 12 Bit, 65MSPS
• Package / Case: 44-LQFP

SWITCHING SPECIFICATIONS
REV. A
Parameter (Conditions)
SNR
SINAD
Worst Harmonic
Worst Harmonic
Multitone SFDR (with Dither)
Two-Tone IMD Rejection
Analog Input Bandwidth
NOTES
1
2
3
4
5
Specifications subject to change without notice.
Parameter (Conditions)
Maximum Conversion Rate
Minimum Conversion Rate
Aperture Delay (t
Aperture Uncertainty (Jitter)
ENCODE Pulsewidth High
ENCODE Pulsewidth Low
Output Delay (t
NOTES
1
2
3
4
Specifications subject to change without notice.
AC SPECIFICATIONS
All ac specifications tested by driving ENCODE and ENCODE differentially.
For 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
See Overcoming Static Nonlinearities with Dither section for details on improving SFDR performance. To measure SFDR, eight tones from 14 MHz to 18 MHz
F1 = 14.9 MHz, F2 = 16 MHz.
Specification 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)
Outputs 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.
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.
(0.5 MHz spacing) are swept from –20 dBFS to –90 dBFS. An open channel at 16 MHz is used to monitor SFDR.
should be limited to 70 MHz center frequency.
All switching specifications tested by driving ENCODE and ENCODE differentially.
A plot of Performance versus ENCODE is shown in TPC 10.
A plot of Performance versus Duty Cycle (ENCODE = 65 MSPS) is shown in TPC 11.
Analog Input
@ –1 dBFS
Analog Input
@ –1 dBFS
Analog Input
@ –1 dBFS
Analog Input
@ –1 dBFS
Eight Tones @ –20 dBFS
F1, F2 @ –7 dBFS
OD
2
2
A
2.2 MHz
15.5 MHz
31.0 MHz
69.0 MHz
2.2 MHz
15.5 MHz
31.0 MHz
69.0 MHz
(2nd or 3rd)
2.2 MHz
15.5 MHz
31.0 MHz
69.0 MHz
(4th or Higher)
2.2 MHz
15.5 MHz
31.0 MHz
69.0 MHz
) DV
)
CC
5
4
+ 3.3 V/5.0 V
2
3
1
3
(AV
unless otherwise noted.)
CC
= 5 V, DV
4
1
(AV
unless otherwise noted.)
CC
CC
= 3.3 V; ENCODE and ENCODE = 65 MSPS; T
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
Full
Full
+25°C
Temp
Full
Full
+25°C
+25°C
+25°C
+25°C
Full
= +5 V, DV
CC
= +3.3 V; ENCODE and ENCODE = 65 MSPS; T
–3–
Test
Level
V
I
V
V
V
I
V
V
V
I
V
V
V
I
V
V
V
V
V
Test
Level
VI
IV
V
V
IV
IV
IV
Min
64
63.5
74
74
Min
65
6.5
6.5
8.5
MIN
= –40 C, T
AD6640AST
AD6640AST
Typ
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
Typ
400
0.3
10.5
MAX
MIN
= +85 C,
= –40 C, T
Max
Max
6.5
12.5
MAX
= +85 C,
AD6640
Unit
dB
dB
dB
dB
dB
dB
dB
dB
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBFS
dBc
MHz
Unit
MSPS
MSPS
ps
ps rms
ns
ns
ns