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PDF AD9284 Data sheet ( Hoja de datos )
| Número de pieza | AD9284 | |
| Descripción | 1.8 V Dual Analog-to-Digital Converter (ADC) | |
| Fabricantes | Analog Devices | |
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Data Sheet
8-Bit, 250 MSPS, 1.8 V Dual
Analog-to-Digital Converter (ADC)
AD9284
FEATURES
GENERAL DESCRIPTION
Single 1.8 V supply operation
SNR: 49.3 dBFS at 200 MHz input at 250 MSPS
SFDR: 65 dBc at 200 MHz input at 250 MSPS
Low power: 314 mW at 250 MSPS
On-chip reference and track-and-hold
1.2 V p-p analog input range for each channel
Differential input with 500 MHz bandwidth
LVDS-compliant digital output
DNL: ±0.2 LSB
Serial port control options
Offset binary, Gray code, or twos complement data format
Optional clock duty cycle stabilizer
Built-in selectable digital test pattern generation
Pin-programmable power-down function
Available in 48-lead LFCSP
APPLICATIONS
Communications
Diversity radio systems
I/Q demodulation systems
Battery-powered instruments
Handheld scope meters
Low cost digital oscilloscopes
OTS: video over fiber
The AD9284 is a dual 8-bit, monolithic sampling, analog-to-digital
converter (ADC) that supports simultaneous operation and is
optimized for low cost, low power, and ease of use. Each ADC
operates at up to a 250 MSPS conversion rate with outstanding
dynamic performance.
The ADC requires a single 1.8 V supply and an encode clock for
full performance operation. No external reference components
are required for many applications. The digital outputs are LVDS
compatible.
The AD9284 is available in a Pb-free, 48-lead LFCSP that is
specified over the industrial temperature range of −40°C to +85°C.
PRODUCT HIGHLIGHTS
1. Integrated Dual 8-Bit, 250 MSPS ADC.
2. Single 1.8 V Supply Operation with LVDS Outputs.
3. Power-Down Option Controlled via a Pin-Programmable
Setting.
FUNCTIONAL BLOCK DIAGRAM
SDIO/
PWDN CSB SCLK
OE
CLK+
CLK–
VIN+A
VIN–A
VCM
VREF
1.0V
VREF
SPI
ADC
D7+ (MSB), D7– (MSB)
D0+ (LSB), D0– (LSB)
(CHANNEL A)
REF
SELECT
×1.5
CLOCK
MANAGEMENT
DCO
GENERATION
DCO+
DCO–
VIN–B
VIN+B
ADC
D7+ (MSB), D7– (MSB)
D0+ (LSB), D0– (LSB)
(CHANNEL B)
AD9284
RBIAS
AGND
AVDD DRVDD DRGND
Figure 1.
Rev. A
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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 ©2011–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
AD9284
Data Sheet
AC SPECIFICATIONS
AVDD = 1.8 V, DRVDD = 1.8 V, 1.0 V internal ADC reference, maximum sample rate, VIN = −1.0 dBFS differential input, unless
otherwise noted.
Table 2.
Parameter
SIGNAL-TO-NOISE RATIO (SNR)
fIN = 10.3 MHz
fIN = 70 MHz
fIN = 96.6 MHz
fIN = 220 MHz
SIGNAL-TO-NOISE-AND-DISTORTION (SINAD)
fIN = 10.3 MHz
fIN = 70 MHz
fIN = 96.6 MHz
fIN = 220 MHz
EFFECTIVE NUMBER OF BITS (ENOB)
fIN = 10.3 MHz
fIN = 70 MHz
fIN = 96.6 MHz
fIN = 220 MHz
WORST SECOND OR THIRD HARMONIC
fIN = 10.3 MHz
fIN = 70 MHz
fIN = 96.6 MHz
fIN = 220 MHz
SPURIOUS-FREE DYNAMIC RANGE (SFDR)
fIN = 10.3 MHz
fIN = 70 MHz
fIN = 96.6 MHz
fIN = 220 MHz
WORST OTHER HARMONIC OR SPUR
fIN = 10.3 MHz
fIN = 70 MHz
fIN = 96.6 MHz
fIN = 220 MHz
CROSSTALK
Temperature Min
25°C
25°C
Full 48.7
25°C
25°C
25°C
Full 48.5
25°C
25°C
25°C
Full 7.8
25°C
25°C
25°C
Full
25°C
25°C
25°C
Full 61
25°C
25°C
25°C
Full
25°C
Full
Typ Max
49.3
49.3
49.3
49.3
49.2
49.2
49.2
49.2
7.9
7.9
7.9
7.9
−70
−70
−70 −61
−65
70
70
69
65
−71
−71
−70 −64
−67
−80
Unit
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
Bits
Bits
Bits
Bits
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
Rev. A | Page 4 of 24
5 Page 
AD9284
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
AVDD = 1.8 V, DRVDD = 1.8 V, sample rate = 250 MSPS, DCS enabled, 1.2 V p-p differential input, VIN = −1.0 dBFS, 64k sample,
TA = 25°C, unless otherwise noted.
00
250MSPS
250MSPS
4.3MHz @ –1dBFS
96.6MHz @ –1dBFS
–20
SNR = 48.3dB (49.3dBFS)
ENOB = 7.7
–20
SNR = 48.3dB (49.3dBFS)
ENOB = 7.7
SFDR = 70.3dBc
SFDR = 70.0dBc
–40 –40
SECOND HARMONIC
–60
THIRD HARMONIC
–80
SECOND HARMONIC
–60
THIRD HARMONIC
–80
–100
–100
–120
0
25 50 75 100
FREQUENCY (MHz)
Figure 4. Single-Tone FFT with fIN = 4.3 MHz
125
0
250MSPS
330.3MHz @ –1dBFS
–20
SNR = 48.2dB (49.2dBFS)
ENOB = 7.6
SFDR = 60.9dBc
–40
THIRD HARMONIC
–60
SECOND HARMONIC
–80
–100
–120
0
25 50 75 100
FREQUENCY (MHz)
Figure 5. Single-Tone FFT with fIN = 220.3 MHz
125
80
70
SFDR (dBFS)
60
SNR (dBFS)
50
40 REFERENCE LINE
SFDR (dBc)
30
20 SNR (dBc)
10
0
–45 –40 –35 –30 –25 –20 –15 –10
AIN POWER (dBFS)
–5
0
Figure 6. SFDR/SNR vs. Input Amplitude (AIN) with fIN = 2.2 MHz
–120
0
25 50 75 100
FREQUENCY (MHz)
Figure 7. Single-Tone FFT with fIN = 96.6 MHz
125
0
250MSPS
29.2MHz @ –7dBFS
–20
32.2MHz @ –7dBFS
SFDR = 69.6dBc (76.6dBFS)
–40
–60
–80
–100
–120
0
25 50 75 100
FREQUENCY (MHz)
125
Figure 8. Two-Tone FFT with fIN1 = 29.1 MHz and fIN2 = 32.1 MHz
80
IMD3 (dBFS)
70
60
SFDR (dBFS)
50
40
IMD3 (dBc)
30
20
SFDR (dBc)
10
0
–45 –40 –35 –30 –25 –20 –15 –10
AIN POWER (dBFS)
–5
0
Figure 9. Two-Tone SFDR/IMD3 vs. Input Amplitude (AIN)
with fIN1 = 29.1 MHz and fIN2 = 32.1 MHz
Rev. A | Page 10 of 24
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet AD9284.PDF ] | |
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