|
Details, datasheet, quote on part number:DAC908U
| |
| Part: | DAC908U |
| Category: | Data Conversion => DAC (Digital to Analog Converters) |
| Description: | ti DAC908, 8-Bit, 165MSPS SpeedPlus(TM) DAC Scalable Current Outputs Between 2mA to 20mA |
| Company: | Texas Instruments, Inc. |
| Datasheet: | Download DAC908U datasheet File size : 495 kB |
| Request For quote: | Find where to buy DAC908U
|
| |
Datasheet text preview:
DAC908
DAC 908
DAC9 08
SBAS109B JUNE 2003
8-Bit, 165MSPS DIGITAL-TO-ANALOG CONVERTER
TM
FEATURES
q SINGLE +5V OR +3V OPERATION q HIGH SFDR: 5.04MHz Output at 100MSPS: 67dBc q LOW GLITCH: 3pV-s q LOW POWER: 170mW at +5V q INTERNAL REFERENCE: Optional Ext. Reference Adjustable Full-Scale Range Multiplying Option
APPLICATIONS
q MEDICAL INSTRUMENTATION Ultrasound (DBF) q VIDEO, DIGITAL TV q WAVEFORM GENERATION Direct Digital Synthesis (DDS) Arbitrary Waveform Generation (ARB) q TEST INSTRUMENTATION q COMMUNICATIONS
For noncontinuous operation of the DAC908, a power-down mode results in only 45mW of standby power. The DAC908 comes with an integrated 1.24V bandgap reference and edge-triggered input latches, offering a complete converter solution. Both +3V and +5V CMOS logic families can be interfaced to the DAC908. The reference structure of the DAC908 allows for additional flexibility by utilizing the on-chip reference, or applying an external reference. The full-scale output current can be adjusted over a span of 2mA to 20mA, with one external resistor, while maintaining the specified dynamic performance. The DAC908 is available in the SO-28 and TSSOP-28 packages.
+VA DAC908 LSB Switches Segmented Switches IOUT IOUT BYP BW +VD
DESCRIPTION
The DAC908 is a high-speed, Digital-to-Analog Converter (DAC) offering an 8-bit resolution option within the SpeedPlus family of high-performance converters. Featuring pin compatibility among family members, the DAC900, DAC902, and DAC904 provide a component selection option to an 10-, 12-, and 14-bit resolution, respectively. All models within this family of DACs support update rates in excess of 165MSPS with excellent dynamic performance, and are especially suited to fulfill the demands of a variety of applications. The advanced segmentation architecture of the DAC908 is optimized to provide a high Spurious-Free Dynamic Range (SFDR) for single-tone, as well as for multi-tone signals--essential when used for the transmit signal path of communication systems. The DAC908 has a high impedance (200k) current output with a nominal range of 20mA and an output compliance of up to 1.25V. The differential outputs allow for both a differential or singleended analog signal interface. The close matching of the current outputs ensures superior dynamic performance in the differential configuration, which can be implemented with a transformer. Utilizing a small geometry CMOS process, the monolithic DAC908 can be operated on a wide, single-supply range of +2.7V to +5.5V. Its low power consumption allows for use in portable and batteryoperated systems. Further optimization can be realized by lowering the output current with the adjustable full-scale option.
FSA REFIN
Current Sources
INT/EXT Latches +1.24V Ref. 8-Bit Data Input AGND CLK D7...D0 DGND PD
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.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright © 2002-2003, Texas Instruments Incorporated
www.ti.com
ABSOLUTE MAXIMUM RATINGS
+V A to AGND ...... 0.3V to +6V +V D to DGND ...... 0.3V to +6V AGND to DGND ........ 0.3V to +0.3V +V A to +VD .... 6V to +6V CLK, PD to DGND ..... 0.3V to VD + 0.3V D0-D7 to DGND ......... 0.3V to VD + 0.3V IOUT, IOUT to AGND ........ 1V to VA + 0.3V BW, BYP to AGND ..... 0.3V to VA + 0.3V REFIN, FSA to AGND ....... 0.3V to VA + 0.3V INT/EXT to AGND ...... 0.3V to VA + 0.3V Junction Temperature ........... +150°C Case Temperature ....... +100°C Storage Temperature ........... +125°C
ELECTROSTATIC DISCHARGE SENSITIVITY
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. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
PACKAGE /ORDERING INFORMATION
PACKAGE DRAWING NUMBER 217 SPECIFIED TEMPERATURE RANGE 40°C to +85°C PACKAGE MARKING DAC908U ORDERING NUMBER(1) DAC908U DAC908U/1K DAC908E DAC908E/2K5 TRANSPORT MEDIA Rails Tape and Reel Rails Tape and Reel
PRODUCT DAC908U
PACKAGE SO-28
"
DAC908E
"
TSSOP-28
"
360
"
40°C to +85°C
"
DAC908E
"
"
"
"
"
NOTE: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces of "DAC908E/2K5" will get a single 2500-piece Tape and Reel.
DEMO BOARD ORDERING INFORMATION
PRODUCT DAC908U DAC908E DEMO BOARD ORDERING NUMBER DEM-DAC90xU DEM-DAC908E COMMENT Populated evaluation board without DAC. Order sample of desired DAC90x model separately. Populated evaluation board including the DAC908E.
ELECTRICAL CHARACTERISTICS
At TA = full specified temperature range, +VA = +5V, +VD = +5V, differential transformer coupled output, 50ý doubly terminated, unless otherwise specified. DAC908U/E PARAMETER RESOLUTION OUTPUT UPDATE RATE Output Update Rate (fCLOCK) Full Specified Temperature Range, Operating STATIC Differential Nonlinearity (DNL) Integral Nonlinearity (INL) DYNAMIC PERFORMANCE Spurious-Free Dynamic Range (SFDR) fOUT = 1.0MHz, fCLOCK = 25MSPS fOUT = 2.1MHz, fCLOCK = 50MSPS fOUT = 5.04MHz, fCLOCK = 50MSPS fOUT = 5.04MHz, fCLOCK = 100MSPS fOUT = 20.2MHz, fCLOCK = 100MSPS fOUT = 25.3MHz, fCLOCK = 125MSPS fOUT = 41.5MHz, fCLOCK = 125MSPS fOUT = 27.4MHz, fCLOCK = 165MSPS fOUT = 54.8MHz, fCLOCK = 165MSPS Spurious-Free Dynamic Range within a Window fOUT = 2.1MHz, fCLOCK = 50MSPS fOUT = 5.04MHz, fCLOCK = 100MSPS Total Harmonic Distortion (THD) fOUT = 2.1MHz, fCLOCK = 50MSPS fOUT = 5.04MHz, fCLOCK = 100MSPS fOUT = 20.2MHz, fCLOCK = 100MSPS ACCURACY(1) 2.7V to 3.3V 4.5V to 5.5V Ambient, TA TA = +25°C fCLOCK = 25MSPS, fOUT = 1.0MHz TA = +25°C To Nyquist 64 70 69 67 67 61 57 51 58 52 70 69 72 66 60 dBc dBc dBc dBc dBc dBc dBc dBc dBc dBc dBc dBc dBc dBc 125 165 40 0.5 0.5 CONDITIONS MIN TYP 8 165 200 +85 ±0.25 ±0.25 +0.5 +0.5 MAX UNITS Bits MSPS MSPS °C LSB LSB
2MHz Span 4MHz Span
2
DAC908
SBAS109B
ELECTRICAL CHARACTERISTICS (Cont.)
At TA = +25°C, +VA = +5V, +V D = +5V, differential transformer coupled output, 50 doubly terminated, unless otherwise specified. DAC908U/E PARAMETER DYNAMIC PERFORMANCE (Cont.) Output Settling Time(2) Output Rise Time(2) Output Fall Time(2) Glitch Impulse DC-ACCURACY Full-Scale Output Range(3) (FSR) Output Compliance Range Gain Error Gain Error Gain Drift Offset Error Offset Drift Power-Supply Rejection, +VA Power- Supply Rejection, +VD Output Noise Output Resistance Output Capacitance REFERENCE Reference Voltage Reference Tolerance Reference Voltage Drift Reference Output Current Reference Input Resistance Reference Input Compliance Range Reference Small-Signal Bandwidth(4) DIGITAL INPUTS Logic Coding Latch Command Logic High Voltage, VIH Logic Low Voltage, VIL Logic High Voltage, VIH Logic Low Voltage, VIL Logic High Current, IIH(5) Logic Low Current, IIL Input Capacitance POWER SUPPLY Supply Voltages +VA +VD Supply Current(6) IVA IVA, Power-Down Mode IVD Power Dissipation Power Dissipation, Power-Down Mode Thermal Resistance, JA SO-28 TSSOP-28 CONDITIONS MIN TYP MAX UNITS
to 0.1% 10% to 90% 10% to 90%
30 2 2 3 2.0 1.0 10 10 0.025 ±0.1 0.2 0.025 +0.2 +0.025 50 200 12 +1.24 ±5 ±50 10 1 0.1 1.3 Straight Binary Rising Edge of Clock 5 0 3 0 ±20 ±20 5 1.25 20.0 +1.25 +10 +10 +0.025
ns ns ns pV-s mA V %FSR %FSR ppmFSR/ °C %FSR ppmFSR/°C %FSR/V %FSR/V p A /H z k pF V % p p m F S R /° C µA M V MHz
All Bits High, IOUT With Internal Reference With External Reference With Internal Reference With Internal Reference With Internal Reference
±1 ±2 ±120
IOUT = 20mA, RLOAD = 50 IOUT, IOUT to Ground
+VD +VD +VD +VD +VD +VD
= = = = = =
+5V +5V +3V +3V +5V +5V
3.5 2
1.2 0.8
V V V V µA µA pF
+2.7 +2.7
+5 +5 24 1.1 8 170 50 45 75 50
+5.5 +5.5 30 2 15 230
V V mA mA mA mW mW mW °C/W °C/W
+5V, IOUT = 20mA +3V, IOUT = 2mA
NOTES: (1) At output IOUT, while driving a virtual ground. (2) Measured single-ended into 50 Load. (3) Nominal full-scale output current is 32x IREF; see Application Section for details. (4) Reference bandwidth depends on size of external capacitor at the BW pin and signal level. (5) Typically 45µA for the PD pin, which has an internal pull-down resistor. (6) Measured at fCLOCK = 50MSPS and f OUT = 1.0MHz.
DAC908
SBAS109B
3
PIN CONFIGURATION
Top View SO, TSSOP
PIN DESCRIPTIONS
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 DESIGNATOR Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8 NC NC NC NC NC NC PD DESCRIPTION Data Bit 1 (D7), MSB Data Bit 2 (D6) Data Bit 3 (D5) Data Bit 4 (D4) Data Bit 5 (D3) Data Bit 6 (D2) Data Bit 7 (D1) Data Bit 8 (D0), LSB No Connection No Connection No Connection No Connection No Connection No Connection Power Down, Control Input; Active HIGH. Contains internal pull-down circuit; may be left unconnected if not used. Reference Select Pin; Internal (= 0) or External (= 1) Reference Operation. Reference Input/Ouput. See Applications section for further details. Full-Scale Output Adjust Bandwidth/Noise Reduction Pin: Bypass with 0.1µF to +VA for Optimum Performance. Analog Ground Complementary DAC Current Output DAC Current Output Bypass Node: Use 0.1µF to AGND Analog Supply Voltage, 2.7V to 5.5V No Connection Digital Ground Digital Supply Voltage, 2.7V to 5.5V Clock Input
(MSB) Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 (LSB) Bit 8 NC
(1)
1 2 3 4 5 6 7 DAC908 8 9
28 27 26 25 24 23 22 21 20 19 18 17 16 15
CLK +VD DGND NC(1) +VA BYP IOUT IOUT
16
INT/EXT REF IN FSA BW
AGND BW FSA REFIN INT/EXT PD
20 21 22 23 24 25 26 27 28 AGND IOUT IOUT BYP +VA NC DGND +V D CLK 17 18 19
NC(1) 10 NC(1) 11 NC NC NC
(1) (1) (1)
12 13 14
NOTE: (1) NC pins should be left unconnected or grounded.
TYPICAL CONNECTION CIRCUIT
+5V 0.1µF +VA DAC908 FSA REFIN RSET 0.1µF Current Sources LSB Switches Segmented MSB Switches BW +VD IOUT IOUT BYP 0.1µF 50 20pF 50 1:1 +5V
20pF
INT/EXT PD Latches +1.24V Ref. 8-Bit Data Input AGND CLK D7.......D0 DGND
4
DAC908
SBAS109B
TIMING DIAGRAM
t2 CLOCK t1
tS
Data changes
t
H
Data changes
Stable, Valid
D13 - D0
Data
t PD
t SET
Iout or Iout
SYMBOL t1 t2 tS tH tPD tSET
DESCRIPTION Clock Pulse HIGH Time Clock Pulse LOW Time Data Setup Time Data Hold Time Propagation Delay Time Output Settling Time to 0.1%
MIN
TYP 3 3 1.0 1.5 1 30
MAX
UNITS ns ns ns ns ns ns
DAC908
SBAS109B
5
|
|
