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AD9745 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD9745
Beschreibung Digital-to-Analog Converters
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 30 Seiten
AD9745 Datasheet, Funktion
Data Sheet
Dual, 10-/12-/14-/16-Bit, 250 MSPS,
Digital-to-Analog Converters
AD9743/AD9745/AD9746/AD9747
FEATURES
High dynamic range, dual digital-to-analog converters (DACs)
Low noise and intermodulation distortion
Single carrier W-CDMA ACLR = 80 dBc at 61.44 MHz
intermediate frequency (IF)
Innovative switching output stage permits useable outputs
beyond Nyquist frequency
LVCMOS inputs with dual-port or optional interleaved
single-port operation
Differential analog current outputs are programmable from
8.6 mA to 31.7 mA full-scale
Auxiliary 10-bit current DACs with source/sink capability for
external offset nulling
Internal 1.2 V precision reference voltage source
Operates from 1.8 V and 3.3 V supplies
315 mW power dissipation
Small footprint, RoHS-compliant, 72-lead LFCSP
APPLICATIONS
Wireless infrastructure
W-CDMA, CDMA2000, TD-SCDMA, WiMAX
Wideband communications: LMDS/MMDS, point-to-point
Instrumentation
Radio frequency (RF) signal generators, arbitrary
waveform generators
GENERAL DESCRIPTION
The AD9743/AD9745/AD9746/AD9747 are pin-compatible,
high dynamic range, dual DACs with 10-/12-/ 14-/16-bit
resolutions and sample rates of up to 250 MSPS. The devices
include specific features for direct conversion transmit applications,
including gain and offset compensation, and they interface
seamlessly with analog quadrature modulators, such as the
ADL5370.
A proprietary, dynamic output architecture permits synthesis of
analog outputs even above Nyquist by shifting energy away from
the fundamental and into the image frequency.
A serial peripheral interface (SPI) port provides full
programmability. In addition, some pin-programmable features
are offered for those applications without a controller.
PRODUCT HIGHLIGHTS
1. Low noise and intermodulation distortion (IMD) enables
high quality synthesis of wideband signals.
2. Proprietary switching output for enhanced dynamic
performance.
3. Programmable current outputs and dual auxiliary DACs
provide flexibility and system enhancements.
FUNCTIONAL BLOCK DIAGRAM
CLKP
CLKN
PID<15:0>
CMOS
INTERFACE
INTERFACE LOGIC
10
P2D<15:0>
SERIAL
PERIPHERAL
INTERFACE
INTERNAL
REFERENCE
AND
BIAS
GAIN
DAC
GAIN
DAC
OFFSET
DAC
OFFSET
DAC
16-BIT
DAC1
16-BIT
DAC2
IOUT1P
IOUT1N
IOUT2P
IOUT2N
AUX1P
AUX1N
AUX2P
AUX2N
Figure 1.
Rev. B
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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
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2007–2015 Analog Devices, Inc. All rights reserved.
Technical Support
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AD9745 Datasheet, Funktion
AD9743/AD9745/AD9746/AD9747
Data Sheet
TMIN to TMAX, AVDD33 = 3.3 V, DVDD33 = 3.3 V, DVDD18 = 1.8 V, CVDD18 = 1.8 V, IFS = 20 mA, full-scale digital input, maximum
sample rate, unless otherwise noted. The AD9745 is repeated in Table 4 so the user can compare it with all other parts.
Table 4. AD9745, AD9746, and AD9747
Parameter
SPURIOUS FREE DYNAMIC RANGE (SFDR)
fDAC = 250 MSPS, fOUT = 20 MHz
fDAC = 250 MSPS, fOUT = 70 MHz
fDAC = 250 MSPS, fOUT = 180 MHz1
INTERMODULATION DISTORTION (IMD)
fDAC = 250 MSPS, fOUT = 20 MHz
fDAC = 250 MSPS, fOUT = 70 MHz
fDAC = 250 MSPS, fOUT = 180 MHz1
CROSSTALK
fDAC = 250 MSPS, fOUT = 20 MHz
fDAC = 250 MSPS, fOUT = 70 MHz
fDAC = 250 MSPS, fOUT = 180 MHz1
ADJACENT CHANNEL LEAKAGE RATIO (ACLR) SINGLE
CARRIER W-CDMA
fDAC = 245.76 MSPS, fOUT = 15.36 MHz
fDAC = 245.76 MSPS, fOUT = 61.44 MHz
fDAC = 245.76 MSPS, fOUT = 184.32 MHz1
NOISE SPECTRAL DENSITY (NSD)
fDAC = 245.76 MSPS, fOUT = 15.36 MHz
fDAC = 245.76 MSPS, fOUT = 61.44 MHz
fDAC = 245.76 MSPS, fOUT = 184.32 MHz1
AD9745
AD9746
AD9747
Min Typ Max Min Typ Max Min Typ Max Unit
82 82 82 dBc
70 70 70 dBc
66 66 66 dBc
86 86 86 dBc
80 80 80 dBc
74 74 74 dBc
80 80 80 dBc
80 80 80 dBc
80 80 80 dBc
76
76
72
−155
−155
−155
78
78
74
−163
−160
−158
82
80
74
−165
−162
−160
dBc
dBc
dBc
dBm/Hz
dBm/Hz
dBm/Hz
1 Mix mode.
Rev. B | Page 6 of 30

6 Page









AD9745 pdf, datenblatt
AD9743/AD9745/AD9746/AD9747
Data Sheet
Pin No.
59
60
62
63
65
66
68
69
Mnemonic
IOUT2P
IOUT2N
AUX2P
AUX2N
AUX1N
AUX1P
IOUT1N
IOUT1P
EPAD
Description
DAC2 Current Output True. Sources full-scale current when input data bits are all 1.
DAC2 Current Output Complement. Sources full-scale current when data bits are all 0.
Auxiliary DAC2 Default Current Output Pin.
Auxiliary DAC2 Optional Output Pin. Enable through SPI.
Auxiliary DAC1 Optional Output Pin. Enable through SPI.
Auxiliary DAC1 Default Current Output Pin.
Complementary DAC1 Current Output. Sources full-scale current when data bits are all 0.
DAC1 Current Output. Sources full-scale current when data bits are all 1.
Exposed Thermal Pad. The exposed thermal pad must be soldered to copper pour on
top surface of PCB for mechanical stability and must be electrically tied to low
impedance GND plane for low noise performance.
Rev. B | Page 12 of 30

12 Page





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