Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsData collecting ICsData acquisition IC - DA converter (DAC) TQFP 48

DAC2904

www.ti.com

.............................................................................................................................................. SBAS198C –AUGUST 2001–REVISED OCTOBER 2009

Dual, 14-Bit, 125MSPS

DIGITAL-TO-ANALOG CONVERTER

Check for Samples: DAC2904

FEATURES

APPLICATIONS

• COMMUNICATIONS:

• 125MSPS UPDATE RATE

– Base Stations, WLL, WLAN

• SINGLE SUPPLY: +3.3V or +5V

– Baseband I/Q Modulation

• HIGH SFDR: 78dB at f

OUT

= 10MHz

• MEDICAL/TEST INSTRUMENTATION

• LOW GLITCH: 2pV-s

• ARBITRARY WAVEFORM GENERATORS

• LOW POWER: 310mW

(ARB)

• INTERNAL REFERENCE

• DIRECT DIGITAL SYNTHESIS (DDS)

• POWER-DOWN MODE: 23mW

space

The DAC2904 combines high dynamic performance

with a high update rate to create a cost-effective

DESCRIPTION

solution for a wide variety of waveform-synthesis

The DAC2904 is a monolithic, 14-bit, dual-channel,

applications:

high-speed Digital-to-Analog Converter (DAC), and is

• Pin compatibility between family members

optimized to provide high dynamic performance while

provides 10-bit (DAC2900), 12-bit (DAC2902),

dissipating only 310mW.

and 14-bit (DAC2904) resolution.

Operating with high update rates of up to 125MSPS,

• Pin compatible to the AD9767 dual DAC.

the DAC2904 offers exceptional dynamic

• Gain matching is typically 0.5% of full-scale, and

performance, and enables the generation of very-high

offset matching is specified at 0.02% max.

output frequencies suitable for “Direct IF”

• The DAC2904 utilizes an advanced CMOS

applications. The DAC2904 has been optimized for

process; the segmented architecture minimizes

communications applications in which separate I and

output-glitch energy, and maximizes the dynamic

Q data are processed while maintaining tight-gain

performance.

and offset matching.

• All digital inputs are +3.3V and +5V logic

Each DAC has a high-impedance differential-current

compatible. The DAC2904 has an internal

output, suitable for single-ended or differential

reference circuit, and allows use in a multiplying

analog-output configurations.

configuration.

The DAC2904 is available in a TQFP-48 package,

and is specified over the extended industrial

temperature range of –40°C to +85°C.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (26 pages)

PAGE 1
DA C 290 4 DAC2904 www.ti.com.............................................................................................................................................. SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009 Dual, 14-Bit, 125MSPS DIGITAL-TO-ANALOG CONVERTER Check for Samples: DAC2904 FEATURES APPLICATIONS • • • • • • • • 1 2 125MSPS UPDATE RATE SINGLE SUPPLY: +3.
PAGE 2
DAC2904 SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009.............................................................................................................................................. www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
PAGE 3
DAC2904 www.ti.com.............................................................................................................................................. SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009 ELECTRICAL CHARACTERISTICS TMIN to TMAX, +VA = +5V, +VD = +3.3V, differential transformer coupled output, and 50Ω doubly-terminated, unless otherwise noted. Independent Gain Mode.
PAGE 4
DAC2904 SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009.............................................................................................................................................. www.ti.com ELECTRICAL CHARACTERISTICS (continued) TMIN to TMAX, +VA = +5V, +VD = +3.3V, differential transformer coupled output, and 50Ω doubly-terminated, unless otherwise noted. Independent Gain Mode.
PAGE 5
DAC2904 www.ti.com.............................................................................................................................................. SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009 ELECTRICAL CHARACTERISTICS (continued) TMIN to TMAX, +VA = +5V, +VD = +3.3V, differential transformer coupled output, and 50Ω doubly-terminated, unless otherwise noted. Independent Gain Mode. DAC2904 PARAMETER TEST CONDITIONS MIN TYP MAX UNIT POWER SUPPLY Supply Voltages +VA +3.0 +5 +5.
PAGE 6
DAC2904 SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009.............................................................................................................................................. www.ti.
PAGE 7
DAC2904 www.ti.com.............................................................................................................................................. SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009 tS DATA IN tH D[13:0](n) D[13:0](n + 1) tLPW WRT1 WRT2 tCPW CLK1 CLK2 tSET IOUT1 50% IOUT (n) IOUT (n + 1) IOUT2 tPD TIMING REQUIREMENTS PARAMETER MIN tS Input setup time tH Input hold time 1.5 tLPW, tCPW Latch/Clock pulse width 3.
PAGE 8
DAC2904 SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009.............................................................................................................................................. www.ti.com TYPICAL CHARACTERISTICS At TA = +25°C, +VD = +3.3V, +VA = +5V, differential transformer coupled, IOUT = 20mA, 50Ω double terminated load, and SFDR up to Nyquist, unless otherwise noted.
PAGE 9
DAC2904 www.ti.com.............................................................................................................................................. SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, +VD = +3.3V, +VA = +5V, differential transformer coupled, IOUT = 20mA, 50Ω double terminated load, and SFDR up to Nyquist, unless otherwise noted.
PAGE 10
DAC2904 SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009.............................................................................................................................................. www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, +VD = +3.3V, +VA = +5V, differential transformer coupled, IOUT = 20mA, 50Ω double terminated load, and SFDR up to Nyquist, unless otherwise noted. SINGLE-TONE SFDR SINGLE-TONE SFDR 10 10 fCLOCK = 52MSPS fOUT = 5.
PAGE 11
DAC2904 www.ti.com.............................................................................................................................................. SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009 APPLICATION INFORMATION THEORY OF OPERATION DAC TRANSFER FUNCTION The architecture of the DAC2904 uses the current steering technique to enable fast switching and a high update rate.
PAGE 12
DAC2904 SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009.............................................................................................................................................. www.ti.
PAGE 13
DAC2904 www.ti.com.............................................................................................................................................. SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009 OUTPUT CONFIGURATIONS DIFFERENTIAL WITH TRANSFORMER The current outputs of the DAC2904 allow for a variety of configurations, some of which are illustrated in Table 1. As mentioned previously, utilizing the converter differential outputs will yield the best dynamic performance.
PAGE 14
DAC2904 SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009.............................................................................................................................................. www.ti.com DIFFERENTIAL CONFIGURATION USING AN OP AMP If the application requires a dc-coupled output, a difference amplifier may be considered, as shown in Figure 21.
PAGE 15
DAC2904 www.ti.com.............................................................................................................................................. SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009 CF is added across RF to compensate for this noise gain peaking.
PAGE 16
DAC2904 SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009.............................................................................................................................................. www.ti.com VOUT ~ 0VP to 1.20VP VIN ~ 0.6VP to 1.8VP IIN IREF IIN DAC2904 IOUT1 IREF IOUT 1 Signal Conditioning S RF QIN IOUT2 QREF IOUT 2 Quadrature Modulator Signal conditioning (level-shifting) may be required to ensure correct dc common-mode levels at the input of the quadrature modulator.
PAGE 17
DAC2904 www.ti.com.............................................................................................................................................. SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009 GAIN SETTING OPTIONS +5V The full-scale output current on the DAC2904 can be set two ways: either for each of the two DAC channels independently or for both channels simultaneously. For the independent gain set mode, the GSET pin (pin 42) must be low (that is, connected to AGND).
PAGE 18
DAC2904 SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009.............................................................................................................................................. www.ti.com planes must be confined to areas covering digital circuitry, including the digital input lines connecting to the converter, as well as the clock signal. The analog and digital ground planes should be joined together at one point underneath the DAC.
PAGE 19
DAC2904 www.ti.com.............................................................................................................................................. SBAS198C – AUGUST 2001 – REVISED OCTOBER 2009 REVISION HISTORY NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision B (November, 2003) to Revision C ..........................................................................................
PAGE 20
PACKAGE OPTION ADDENDUM www.ti.
PAGE 21
PACKAGE OPTION ADDENDUM www.ti.
PAGE 22
PACKAGE MATERIALS INFORMATION www.ti.com 16-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant DAC2904Y/1K TQFP PFB 48 1000 330.0 16.4 9.6 9.6 1.5 12.0 16.0 Q2 DAC2904Y/250 TQFP PFB 48 250 330.0 16.4 9.6 9.6 1.5 12.0 16.
PAGE 23
PACKAGE MATERIALS INFORMATION www.ti.com 16-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) DAC2904Y/1K TQFP PFB 48 1000 367.0 367.0 38.0 DAC2904Y/250 TQFP PFB 48 250 367.0 367.0 38.
PAGE 24
MECHANICAL DATA MTQF019A – JANUARY 1995 – REVISED JANUARY 1998 PFB (S-PQFP-G48) PLASTIC QUAD FLATPACK 0,27 0,17 0,50 36 0,08 M 25 37 24 48 13 0,13 NOM 1 12 5,50 TYP 7,20 SQ 6,80 9,20 SQ 8,80 Gage Plane 0,25 0,05 MIN 0°– 7° 1,05 0,95 Seating Plane 0,75 0,45 0,08 1,20 MAX 4073176 / B 10/96 NOTES: A. All linear dimensions are in millimeters. B. This drawing is subject to change without notice. C.
PAGE 25
PAGE 26
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46C and to discontinue any product or service per JESD48B. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.