DAC1282_15 Datasheet, PDF (5/46 Pages) Texas Instruments – Low Distortion Digital-to-Analog Converter for Seismic

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DAC1282, DAC1282A
SBAS490B – DECEMBER 2011 – REVISED MAY 2015
7.4 Electrical Characteristics
Minimum and maximum specifications are at T_A = –40°C to +85°C. Typical specifications are at T_A = +25°C, AVDD = +2.5 V,
AVSS = –2.5 V, f_CLK = 4.096 MHz, V_REF = 5 V, and DVDD = 3.3 V (unless otherwise noted). Refer to Figure 50. DAC1282A
supports gains = 1/1, 1/4, and 1/16 only.
PARAMETER
ANALOG OUTPUT (VOUTP, VOUTN)
Full-scale output voltage⁽¹⁾
Output common-mode voltage⁽²⁾
Differential output impedance
C_LOAD
R_LOAD
Capacitive load
Resistive load
Output current limit⁽³⁾
High-Z output leakage
DC PERFORMANCE (Excluding Pulse Mode)
Gain error
Gain match
Gain drift
Offset
TEST CONDITIONS
Gain = 1/1 to 1/64
T_A = +25°C
T_A = +85°C
Gain = 1/1
Relative to gain = 1/1
Gain = 1/1 to 1/64
Offset drift
AC PERFORMANCE
THD
Total harmonic distortion⁽⁵⁾
SNR
Signal-to-noise ratio⁽⁶⁾
PSR
Output frequency
Digital gain
Power-supply rejection
DAC1282
DAC1282A
Gain = 1/1
Gain = 1/2, 1/4, 1/8
Gain = 1/16
Gain = 1/32
Gain = 1/64
Gain = 1/1
Gain = 1/4, 1/16
Gain = 1/1
Gain = 1/2
Gain = 1/4
Gain = 1/8
Gain = 1/16
Gain = 1/32
Gain = 1/64
AVDD, AVSS
DVDD
0.5-dB steps
60-Hz ac, gain = 1/8
MIN
TYP
MAX
UNIT
±V_REF /2 × gain
–0.1
1.6
100
±60
2
50
V
V
Ω
2
nF
Ω
mA
nA
±0.1%
±0.05%
2
±(7/gain) + 50
1.5
±0.75%
±0.5%
±(75/gain) +
300
ppm/°C
ppm
FSR ⁽⁴⁾
ppm
FSR/°C
116
0.4883
Full mute
–125
–125
–123
–115
–111
–118
–118
120
119
117
114
110
106
100
85
120
–118
dB
dB
dB
dB
dB
–106
dB
dB
dB
dB
dB
dB
dB
dB
dB
250
Hz
0
dB
dB
dB
(1) Full-scale differential output voltage: V_OUT = (VOUTP – VOUTN) = ±V_REF/2 × Gain. Gain is the DAC analog gain.
(2) Output common-mode voltage scales with analog supply voltage: V_COM = 0.48 × (AVDD – AVSS) + AVSS.
(3) Sink or source current limit of VOUTP and VOUTN.
(4) FSR – full-scale range = V_REF × gain.
(5) THD = total harmonic distortion. THD is measured by the ADS1282, and is the sum of first nine harmonics using complementing gain.
f_OUT = 31.25 Hz, V_OUT – 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. f_OUT = 31.25 Hz
and V_OUT – 0.5 dBFS.
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