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DAC1282 Fiches technique(PDF) 3 Page - Texas Instruments

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No de pièce DAC1282
Description  LOW DISTORTION DIGITAL-TO-ANALOG CONVERTER FOR SEISMIC
Download  43 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

DAC1282 Fiches technique(HTML) 3 Page - Texas Instruments

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DAC1282
www.ti.com
SBAS490
– DECEMBER 2011
ELECTRICAL CHARACTERISTICS
Minimum/maximum specifications are at TA = –40°C to +85°C. Typical specifications are at TA = +25°C, AVDD = +2.5 V,
AVSS =
–2.5 V, fCLK = 4.096 MHz, VREF = 5 V, and DVDD = 3.3 V, unless otherwise noted. Refer to Figure 50.
DAC1282
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ANALOG OUTPUT (VOUTP, VOUTN)
Full-scale output voltage(1)
Gain = 1/1 to 1/64
±VREF /2 × gain
V
Output common-mode voltage(2)
–0.1
V
Differential output impedance
1.6
CLOAD
Capacitive load
2
nF
RLOAD
Resistive load
100
Ω
Output current limit(3)
±60
mA
TA = +25°C
2
High-Z output leakage
nA
TA = +85°C
50
DC PERFORMANCE (Excluding Pulse Mode)
Gain error
Gain = 1/1
±0.1
±0.75
%
Gain match
Relative to gain = 1/1
±0.05
±0.5
%
Gain drift
2
ppm/
°C
±(75/gain) +
ppm
Offset
Gain = 1/1 to 1/64
±(7/gain) + 50
300
FSR(4)
ppm
Offset drift
1.5
FSR/
°C
AC PERFORMANCE
Gain = 1/1
–125
–118
dB
Gain = 1/2, 1/4, 1/8
–125
dB
THD
Total harmonic distortion(5)
Gain = 1/16
–123
dB
Gain = 1/32
–115
dB
Gain = 1/64
–111
dB
Gain = 1/1
116
120
dB
Gain = 1/2
119
dB
Gain = 1/4
117
dB
SNR
Signal-to-noise ratio(6)
Gain = 1/8
114
dB
Gain = 1/16
110
dB
Gain = 1/32
106
dB
Gain = 1/64
100
dB
Output frequency
0.4883
250
Hz
Digital gain
0.5-dB steps
Full mute
0
dB
AVDD, AVSS
85
dB
PSR
Power-supply rejection
60-Hz ac, gain = 1/8
DVDD
120
dB
(1)
Full-scale differential output voltage: VOUT = (VOUTP – VOUTN) = ±VREF/2 × Gain. Gain is the DAC analog gain.
(2)
Output common-mode voltage scales with analog supply voltage: VCOM = 0.48 × (AVDD – AVSS) + AVSS.
(3)
Sink or source current limit of VOUTP and VOUTN.
(4)
FSR
– full-scale range = VREF × gain.
(5)
THD = total harmonic distortion. THD is measured by the ADS1282, and is the sum of first nine harmonics using complementing gain.
fOUT = 31.25 Hz, VOUT – 0.5 dBFS, no load.
(6)
SNR = signal-to-noise ratio. SNR is measured by the ADS1282 over a 413-Hz bandwidth using complementing gain. fOUT = 31.25 Hz
and VOUT – 0.5 dBFS.
Copyright
© 2011, Texas Instruments Incorporated
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