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PDF DAC2932 Data sheet ( Hoja de datos )
| Número de pieza | DAC2932 | |
| Descripción | 40MSPS DIGITAL-TO-ANALOG CONVERTER | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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DAC2932
SBAS279C − AUGUST 2003 − REVISED OCTOBER 2004
Dual, 12ĆBit, 40MSPS
DigitalĆtoĆAnalog Converter
FEATURES
D Dual, 12-Bit, 40MSPS Current Output DAC
D Four 12-Bit Voltage Output DACs—for
www.DataSheet4U.comTransmit Control
D Single +3V Operation
D Very Low Power: 29mW
D High SFDR: 75dB at fOUT = 5MHz
D Low-Current Standby or Full Power-Down
Modes
D Internal Reference
D Optional External Reference
D Adjustable Full-Scale Range: 0.5mA to 2mA
APPLICATIONS
D Transmit Channels
− I and Q
− PC Card Modems: GPRS, CDMA
− Wireless Network Cards (NICs)
D Signal Synthesis (DDS)
D Portable Medical Instumentation
D Arbitrary Waveform Generation (AWG)
DESCRIPTION
The DAC2932 is a dual 12-bit, current-output
digital-to-analog converter (DAC) designed to combine the
features of high dynamic range and very low power
consumption. The DAC2932 converter supports update
rates of up to 40MSPS. In addition, the DAC2932 features
four 12-bit voltage output DACs, which can be used to
perform system control functions.
The advanced segmentation architecture of the DAC2932
is optimized to provide a high spurious-free dynamic range
(SFDR).
The DAC2932 has a high impedance (> 200kΩ) differential
current output with a nominal range of 2mA and a
compliance voltage of up to 0.8V. The differential outputs
allow for either a differential or single-ended 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. Using a small geometry CMOS process, the
monolithic DAC2932 is designed to operate within a
single-supply range of 2.7V to 3.3V. Low power
consumption makes it ideal for portable and
battery-operated systems. Further optimization by
lowering the output current can be realized with the
adjustable full-scale option. The full-scale output current
can be adjusted over a span of 0.5mA to 2mA.
For noncontinuous operation of the DAC2932, a full
power-down mode can reduce the power dissipation to as
little as 25µW.
The DAC2932 is designed to operate with a single parallel
data port. While it alternates the loading of the input data
into separate input latches for both current output DACs
(I-DACs), the updating of the analog output signal occurs
simultaneously. The DAC2932 integrates a temperature
compensated 1.22V bandgap reference. The DAC2932
also allows for additional flexibility of using an external ref-
erence.
The DAC2932 is available in a TQFP-48 package.
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.
All 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 Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright 2003−2004, Texas Instruments Incorporated
www.ti.com
1 page  
DAC2932
www.ti.com
SBAS279C − AUGUST 2003 − REVISED OCTOBER 2004
ELECTRICAL CHARACTERISTICS: V-DAC
At TA = TMIN to TMAX (typical values are at TA = 25°C), +VAV = +3V, +VDV = +3V, RL = 2kΩ to GND, and CL = 40pF, unless otherwise noted.
DAC2932
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Static Performance(1)
Resolution
Relative accuracy
Differential nonlinearity, DNL
Zero code error(2)
Full-scale error(2)
Zero code error drift
www.DataSheet4U.Fcoulml-scale error drift
Output Characteristics(3)
Reference voltage setting, REFV
Output voltage settling time
Slew rate
Capacitive load stability
Code change glitch impulse
Digital feedthrough
DC output impedance
Short-circuit current
Power-up time
Logic Inputs(3)
Input current
Input low voltage, VIL
Input high voltage, VIH
Input capacitance
At 25°C
Tested; monotonic by design
All 0s loaded to DAC register
All 1s loaded to DAC register
−16
−1
−10
1/4 scale to 3/4 scale change (400h to C00h)
CL = 470pF
RL = 2kΩ
1LSB change around major carry
0
Coming out of power-down mode
2
12
±8
±0.2
0.2
−3
5
−15
+16
+1
+0.8
+2
Bits
LSB
LSB
%FSR
%FSR
µV/°C
ppmFSR/°C
+VAV
3
5
1
470
11
0.5
4
20
8
V
µs
µs
V/µs
pF
nV-s
nV-s
Ω
mA
µs
±1
0 0.8
3
5
µA
V
V
pF
(1) Linearity calculated using a reduced code range of 48 to 3976.
(2) Full-scale range (FSR) based on reference REFV = +VAV = +3.0V.
(3) Ensured by design and characterization; not production tested.
5
5 Page 
DAC2932
www.ti.com
SBAS279C − AUGUST 2003 − REVISED OCTOBER 2004
TYPICAL CHARACTERISTICS (continued)
TA = +25°C, +VA = +VAV = +3V, +VD = +VDV = +3V, IOUTFS = 2mA, differential transformer-coupled output (n = 4:1), RL = 400Ω on I-DAC,
RL = 2kΩ on V-DAC, and GSET = H unless otherwise noted.
SFDR vs IOUT FS AND fOUT AT 40MSPS, 0dBFS
80
1mA
75
70
1.5mA
0.5mA
65
2mA
www.DataSheet4U.com 60
55
50
0 2 4 6 8 10 12 14 16 18 20
fOUT (MHz)
Figure 9
SFDR vs TEMPERATURE
80
75
2.2MHz, 40MSPS
70
1MHz, 20MSPS
65
10MHz, 40MSPS
60
55
19.9MHz, 40MSPS
50
−40 −30 −20 −10 0 10 20 30 40 50 60 70 80 85
Temperature (_C)
Figure 10
TOTAL HARMONIC DISTORTION vs
fCLK AT fOUT = 2.2MHZ
−60
−65
−70
−75
−80
5
10 15 20 25 30 35 40
fCLK (MSPS)
Figure 11
TOTAL HARMONIC DISTORTION vs TEMPERATURE
fOUT = 1MHz at 20MSPS
−50
−55
−60
−65
−70
−75
−80
−85
−90
−40 −30 −20 −10 0 10 20 30 40 50 60 70 80 85
Temperature (_C)
Figure 12
1.223
1.222
1.221
1.220
1.219
1.218
1.217
1.216
1.215
−40
REFERENCE VOLTAGE vs TEMPERATURE
−20 0
20 40
60 80 85
Temperature (_C)
Figure 13
1.2201
REFERENCE VOLTAGE vs SUPPLY VOLTAGE
1.2200
1.2199
2.7 2.8 2.9 3.0 3.1 3.2 3.3
Supply Voltage (V)
Figure 14
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet DAC2932.PDF ] | |
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