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PDF AD9858 Data sheet ( Hoja de datos )
| Número de pieza | AD9858 | |
| Descripción | 1 GSPS Direct Digital Synthesizer | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AD9858 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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1 GSPS Direct Digital Synthesizer
AD9858
FEATURES
1 GSPS internal clock speed
Up to 2 GHz input clock (selectable divide-by-2)
Integrated 10-bit DAC
Excellent phase noise and SFDR
32-bit programmable frequency register
Simplified 8-bit parallel and SPI serial control interface
Automatic frequency sweeping capability
4 frequency profiles
3.3 V power supply
Power dissipation: 2 W typical
Integrated programmable charge pump and phase
frequency detector with fast lock circuit
Isolated charge pump supply up to 5 V
Integrated 2 GHz mixer
APPLICATIONS
VHF/UHF LO synthesis
Tuners
Instrumentation
Agile clock synthesis
Cellular base station hopping synthesizers
Radars
SONET/SDH clock synthesis
GENERAL DESCRIPTION
The AD9858 is a direct digital synthesizer (DDS) featuring a
10-bit digital-to-analog converter (DAC) operating up to 1 GSPS.
The AD9858 uses advanced DDS technology coupled with an
internal high speed, high performance DAC to form a digitally
programmable, complete high frequency synthesizer capable of
generating a frequency-agile analog output sine wave at up to
400 MHz. The AD9858 is designed to provide fast frequency
hopping and fine tuning resolution (32-bit frequency tuning
word). The frequency tuning and control words are loaded into
the AD9858 via parallel (8-bit) or serial loading formats. The
AD9858 contains an integrated charge pump (CP) and phase
frequency detector (PFD) for synthesis applications requiring
the combination of a high speed DDS along with phase-locked
loop (PLL) functions. An analog mixer is also provided on chip
for applications requiring the combination of a DDS, PLL, and
mixer, such as frequency translation loops and tuners. The AD9858
also features a divide-by-2 on the clock input, allowing the external
reference clock to be as high as 2 GHz.
The AD9858 is specified to operate over the extended industrial
temperature range of –40°C to +85°C.
DIV
DIV
PD
CP
CPISET
FUNCTIONAL BLOCK DIAGRAM
LO LO
IF IF
RF RF
÷M
÷N
CHARGE
PUMP
PHASE
DETECTOR
DIGITAL PLL
ANALOG
MULTIPLIER
FREQUENCY ACCUMULATOR
PHASE ACCUMULATOR
AD9858
32
15
15
PHASE-TO-
AMPLITUDE
10
DAC
CONVERSION
DACISET
IOUT
IOUT
14
RESET
32
32
TIMING AND CONTROL LOGIC
CONTROL REGISTERS
POWER-
DOWN
LOGIC
÷8
PS0 PS1 I/O PORT
(SER/PAR)
Figure 1.
SYSCLK
M
U
X
÷2
FUD
SYNCLK
REFCLK
REFCLK
Rev. C
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 ©2003–2009 Analog Devices, Inc. All rights reserved.
1 page  
AD9858
ELECTRICAL SPECIFICATIONS
Unless otherwise noted, VDD = 3.3 V ± 5%, CPVDD = 5 V ± 5%, RSET = 2 kΩ, CPISET = 2.4 kΩ, reference clock frequency = 1 GHz.
Table 1.
Parameter
REF CLOCK INPUT CHARACTERISTICS1
Reference Clock Frequency Range (Divider Off )
Reference Clock Frequency Range (Divider On)
Duty Cycle at 1 GHz
Input Capacitance
Input Impedance
Input Sensitivity
DAC OUTPUT CHARACTERISTICS
Resolution
Full-Scale Output Current
Gain Error
Output Offset
Differential Nonlinearity
Integral Nonlinearity
Output Impedance
Voltage Compliance Range
Wideband SFDR (DC to Nyquist)
26 MHz fOUT
65 MHz fOUT
126 MHz fOUT
375 MHz fOUT
180 MHz fOUT (700 MHz REFCLK)
Narrow-Band SFDR2
40 MHz fOUT (±15 MHz)
40 MHz fOUT (±1 MHz)
40 MHz fOUT (±50 kHz)
100 MHz fOUT (±15 MHz)
100 MHz fOUT (±1 MHz)
100 MHz fOUT (±50 kHz)
180 MHz fOUT (±15 MHz)
180 MHz fOUT (±1 MHz)
180 MHz fOUT (±50 kHz)
360 MHz fOUT (±15 MHz)
360 MHz fOUT (±1 MHz)
360 MHz fOUT (±50 kHz)
180 MHz fOUT (±15 MHz, 700 MHz REFCLK)
180 MHz fOUT (±1 MHz, 700 MHz REFCLK)
180 MHz fOUT (±50 kHz, (700 MHz REFCLK)
OUTPUT PHASE NOISE CHARACTERISTICS (AT 103 MHz IOUT)
At 1 kHz Offset
At 10 kHz Offset
At 100 kHz Offset
OUTPUT PHASE NOISE CHARACTERISTICS (AT 403 MHz IOUT)
At 1 kHz Offset
At 10 kHz Offset
At 100 kHz Offset
Temp Test Level Min
Typ Max
Unit
Full VI
Full VI
25°C V
25°C V
25°C IV
Full VI
10
1000
MHz
20
2000
MHz
42 50 58 %
3 pF
1500
Ω
–20 +5 dBm
Full
Full
Full VI
Full VI
Full VI
Full VI
Full VI
Full VI
10
5 20
–10
AVDD – 1.5
0.5
1
100
40
+10
15
1
1.5
AVDD + 0.5
Bits
mA
% FS
μA
LSB
LSB
kΩ
V
Full V
Full V
Full V
Full V
Full IV
70
66
62
58
52
dBc
dBc
dBc
dBc
dBc
Full V
Full V
Full V
Full V
Full V
Full V
Full V
Full V
Full V
Full V
Full V
Full V
Full V
Full V
Full V
82 dBc
87 dBc
88 dBc
81 dBc
82 dBc
86 dBc
74 dBc
84 dBc
85 dBc
75 dBc
85 dBc
86 dBc
65 dBc
80 dBc
84 dBc
Full V
Full V
Full V
–147
–150
–152
dBc/Hz
dBc/Hz
dBc/Hz
Full V
Full V
Full V
–133
–137
–140
dBc/Hz
dBc/Hz
dBc/Hz
Rev. C | Page 3 of 32
5 Page 
TYPICAL PERFORMANCE CHARACTERISTICS
REF LVL
5dBm
01
–10
MARKER 1 [T1]
–0.59dBm
26.0MHz
RBW
VBW
SWT
5kHz
5kHz
64s
RF ATT
UNIT
20dB
dB
A
–20
–30
–40
–50
–60
–70
–80
–90
–100
START: 0Hz
50MHz/
STOP: 500MHz
Figure 3. Wideband SFDR, 26 MHz fOUT
REF LVL
0dBm
01
MARKER 1 [T1]
–0.57dBm
65.0MHz
RBW
VBW
SWT
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
START: 0Hz
50MHz/
5kHz
5kHz
50s
RF ATT
UNIT
20dB
dB
A
STOP: 500MHz
Figure 4. Wideband SFDR, 65 MHz fOUT
REF LVL
0dBm
0
MARKER 1 [T1]
–0.73dBm
126.0MHz
1
RBW
VBW
SWT
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
START: 0Hz
50MHz/
5kHz
5kHz
50s
RF ATT
UNIT
20dB
dB
A
STOP: 500MHz
Figure 5. Wideband SFDR, 126 MHz fOUT
AD9858
REF LVL
5dBm
0
MARKER 1 [T1]
RBW
1.73dBm VBW
26.10050100MHz SWT
1
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
CENTER 26.1MHz
50kHz/
200Hz RF ATT
200Hz
64s UNIT
20dB
dB
A
1AP
SPAN 500kHz
Figure 6. Narrow-Band SFDR, 26 MHz fOUT, 1 MHz BW
REF LVL
5dBm
0
MARKER 1 [T1]
RBW
1.58dBm VBW
65.10200401MHz SWT
1
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
CENTER 65.1MHz
200kHz/
500Hz RF ATT
500Hz
40s UNIT
20dB
dB
A
1AP
SPAN 2MHz
Figure 7. Narrow-Band SFDR, 65 MHz fOUT, 1 MHz BW
REF LVL
5dBm
0
MARKER 1 [T1]
RBW
1.27dBm VBW
126.10200401MHz SWT
1
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
CENTER 126.1MHz
200kHz/
500Hz RF ATT
500Hz
40s UNIT
20dB
dB
A
1AP
SPAN 2MHz
Figure 8. Narrow-Band SFDR, 126 MHz fOUT, 1 MHz BW
Rev. C | Page 9 of 32
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AD9858.PDF ] | |
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