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AD9912ABCPZ Scheda tecnica(PDF) 7 Page - Analog Devices

Il numero della parte AD9912ABCPZ
Spiegazioni elettronici  1 GSPS Direct Digital Synthesizer with 14-Bit DAC
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

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AD9912
Rev. F | Page 7 of 40
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
CMOS Output Driver
(AVDD3/Pin 37) @ 1.8 V
Frequency Range
0.008
40
MHz
See Figure 28 for maximum toggle rate
Duty Cycle
45
55
65
%
With 20 pF load and up to 40 MHz
Rise Time/Fall Time (20% to 80%)
5
6.8
ns
With 20 pF load
DAC OUTPUT CHARACTERISTICS
DCO Frequency Range (1st Nyquist Zone)
0
450
MHz
DAC lower limit is 0 Hz; however, the minimum slew rate
for FDBK_IN dictates the lower limit if using CMOS or HSTL
outputs
Output Resistance
50
Ω
Single-ended (each pin internally terminated to AVSS)
Output Capacitance
5
pF
Full-Scale Output Current
20
31.7
mA
Range depends on DAC RSET resistor
Gain Error
−10
+10
% FS
Output Offset
0.6
μA
Voltage Compliance Range
AVSS −
0.50
+0.5
AVSS +
0.50
V
Outputs connected to a transformer whose center tap is
grounded
Wideband SFDR
See the Typical Performance Characteristics section
20.1 MHz Output
−79
dBc
0 MHz to 500 MHz
98.6 MHz Output
−67
dBc
0 MHz to 500 MHz
201.1 MHz Output
−61
dBc
0 MHz to 500 MHz
398.7 MHz Output
−59
dBc
0 MHz to 500 MHz
Narrow-Band SFDR
See the Typical Performance Characteristics section
20.1 MHz Output
−95
dBc
±250 kHz
98.6 MHz Output
−96
dBc
±250 kHz
201.1 MHz Output
−91
dBc
±250 kHz
398.7 MHz Output
−86
dBc
±250 kHz
DIGITAL TIMING SPECIFICATIONS
Time Required to Enter Power-Down
15
μs
Time Required to Leave Power-Down
18
μs
Reset Assert to High-Z Time
for S1 to S4 Configuration Pins
60
ns
Time from rising edge of RESET to high-Z on the S1, S2, S3,
S4 configuration pins
SERIAL PORT TIMING SPECIFICATIONS
SCLK Clock Rate (1/tCLK )
25
50
MHz
Refer to Figure 56 for all write-related serial port parameters;
maximum SCLK rate for readback is governed by tDV
SCLK Pulse Width High, tHIGH
8
ns
SCLK Pulse Width Low, tLOW
8
ns
SDO/SDIO to SCLK Setup Time, tDS
1.93
ns
SDO/SDIO to SCLK Hold Time, tDH
1.9
ns
SCLK Falling Edge to Valid Data on
SDIO/SDO, tDV
11
ns
Refer to Figure 54
CSB to SCLK Setup Time, tS
1.34
ns
CSB to SCLK Hold Time, tH
−0.4
ns
CSB Minimum Pulse Width High, tPWH
3
ns
IO_UPDATE Pin Setup Time
(from SCLK Rising Edge of the Final Bit)
tCLK
sec
tCLK = period of SCLK in Hz
IO_UPDATE Pin Hold Time
tCLK
sec
tCLK = period of SCLK in Hz
PROPAGATION DELAY
FDBK_IN to HSTL Output Driver
2.8
ns
FDBK_IN to HSTL Output Driver with 2×
Frequency Multiplier Enabled
7.3
ns
FDBK_IN to CMOS Output Driver
8.0
ns
S-divider bypassed
FDBK_IN Through S-Divider to CMOS
Output Driver
8.6
ns
Frequency Tuning Word Update:
IO_UPDATE Pin Rising Edge to DAC
Output
60/fS
ns
fS = system clock frequency in GHz


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