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PDF AD9042 Data sheet ( Hoja de datos )
| Número de pieza | AD9042 | |
| Descripción | Monolithic ADC | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
41 MSPS minimum sample rate
80 dB spurious-free dynamic range
595 mW power dissipation
Single 5 V supply
On-chip track-and-hold (T/H) and reference
Twos complement output format
CMOS-compatible output levels
APPLICATIONS
Cellular/PCS base stations
GPS anti jamming receivers
Communications receivers
Spectrum analyzers
Electro-optics
Medical imaging
ATE
GENERAL DESCRIPTION
The AD9042 is a high speed, high performance, low power,
monolithic 12-bit analog-to-digital converter (ADC). All
necessary functions, including track-and-hold (T/H) and
reference, are included on chip to provide a complete conversion
solution. The AD9042 operates from a single 5 V supply and
provides CMOS-compatible digital outputs at 41 MSPS.
Designed specifically to address the needs of wideband, multi-
channel receivers, the AD9042 maintains 80 dB spurious-free
dynamic range (SFDR) over a bandwidth of 20 MHz. Noise
performance is also exceptional; typical signal-to-noise ratio
(SNR) is 68 dB.
The AD9042 is built on a high speed complementary bipolar
process (XFCB) used by Analog Devices, Inc., and uses an
innovative multipass architecture. Units are packaged in a
44-lead LQFP low profile quad flat package. The AD9042
12-Bit, 41 MSPS
Monolithic ADC
AD9042
AIN
VOFFSET
VREF
ENCODE
ENCODE
FUNCTIONAL BLOCK DIAGRAM
AVCC
DVCC
A1 TH1
TH2
TH3 A2
ADC
2.4V
REFERENCE
ADC
DAC
6
AD9042
7
INTERNAL
TIMING MSB
DIGITAL ERROR CORRECTION LOGIC
LSB
GND
D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Figure 1.
industrial grade is specified from −40°C to +85°C. However,
the AD9042 was designed to perform over the full military
temperature range (−55°C to +125°C); consult the factory for
military grade product options.
PRODUCT HIGHLIGHTS
1. Guaranteed sample rate is 41 MSPS.
2. Dynamic performance specified over entire Nyquist band;
spurious signals 80 dBc typical for −1 dBFS input signals.
3. Low power dissipation: 595 mW off a single 5 V supply.
4. Reference and track-and-hold included on chip.
5. Packaged in 44-lead LQFP.
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©1995–2009 Analog Devices, Inc. All rights reserved.
1 page  
AD9042
SWITCHING SPECIFICATIONS
AVCC = DVCC = 5 V; ENCODE and ENCODE = 41 MSPS; VREF tied to VOFFSET through 50 Ω; TMIN = −40°C, TMAX = +85°C.
Table 2.
Parameter1
Maximum Conversion Rate
Minimum Conversion Rate
Aperture Delay (tA)
Aperture Uncertainty (Jitter)
ENCODE Pulse Width High
ENCODE Pulse Width Low
Output Delay (tOD)
Temperature
Full
Full
25°C
25°C
25°C
25°C
Full
Test Level
VI
IV
V
V
IV
IV
IV
Min Typ
41
−250
0.7
10
10
59
Max
5
14
1 C1 (Pin 10) tied to GND through a 0.01 μF capacitor.
Unit
MSPS
MSPS
ps
ps rms
ns
ns
ns
AC SPECIFICATIONS
AVCC = DVCC = 5 V; ENCODE and ENCODE = 41 MSPS; VREF tied to VOFFSET through 50 Ω; TMIN = −40°C, TMAX = +85°C.
Table 3.
Parameter1, 2
SNR3
Analog Input at −1 dBFS
1.2 MHz
9.6 MHz
19.5 MHz
SINAD4
Analog Input at −1 dBFS
1.2 MHz
9.6 MHz
19.5 MHz
WORST SPUR5
Analog Input at −1 dBFS
1.2 MHz
9.6 MHz
19.5 MHz
SMALL SIGNAL SFDR (WITH DITHER)6
Analog Input
1.2 MHz
9.6 MHz
19.5 MHz
TWO-TONE IMD REJECTION7
F1, F2 @ –7 dBFS
TWO-TONE SFDR (WITH DITHER)8
THERMAL NOISE
Temp
Test Level
25°C V
Full V
25°C V
Full V
25°C I
Full V
25°C V
Full V
25°C V
Full V
25°C I
Full V
25°C V
Full V
25°C V
Full V
25°C I
Full V
Full V
Full V
Full V
Full V
Full V
25°C V
Min Typ
68
67.5
67.5
67
64 67
66.5
67.5
67
67.5
67
64 67
66.5
80
78
80
78
73 80
78
90
90
90
80
90
0.33
Max Units
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dBc
dBc
dBc
dBc
dBc
dBc
dBFS
dBFS
dBFS
dBc
dBFS
LSB rms
Rev. B | Page 4 of 24
5 Page 
AD9042
0
ENCODE = 41MSPS
AIN = 2.5MHz @ –26dBFS
–20 NO DITHER
–40
–60
–80
–100
–120
dc
0
–20
4.1 8.2 12.3 16.4
FREQUENCY (MHz)
Figure 15. 128K FFT Without Dither
20.5
ENCODE = 41MSPS
AIN = 19.5MHz @ –29dBFS
DITHER = –32.5dBm
–40
–60
–80 2 4 6 8
87
53
–100
–120
dc
4.1 8.2 12.3 16.4
FREQUENCY (MHz)
Figure 16. 4K FFT with Dither
20.5
100
90
80
70
60
50
40
30
20
10
0
–80
ENCODE = 41MSPS
AIN = 19.5MHz
DITHER = –32.5dBm
SFDR = 80dB
REFERENCE LINE
–70 –60 –50 –40 –30 –20 –10
ANALOG INPUT POWER LEVEL (dBFS)
Figure 17. SFDR with Dither
0
0
ENCODE = 41MSPS
AIN = 2.5MHz @ –26dBFS
–20 DITHER = –32.5dBm
–40
–60
–80
–100
–120
dc
4.1 8.2 12.3 16.4
FREQUENCY (MHz)
Figure 18. 128K FFT with Dither
20.5
Rev. B | Page 10 of 24
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet AD9042.PDF ] | |
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