DAC1220
www.ti.com...................................................................................................................................... SBAS082G –FEBRUARY 1998–REVISED SEPTEMBER 2009
ELECTRICAL CHARACTERISTICS
All specifications at TMIN to TMAX, AVDD = DVDD = +5V, fXIN = 2.5MHz, VREF = +2.5V, and 16-bit mode, unless otherwise noted.
DAC1220E
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
ACCURACY
Monotonicity
Monotonicity
Linearity error
Unipolar offset error and gain error(2)
Unipolar offset error drift(3)
Bipolar zero offset error(2)
Bipolar zero offset drift(3)
Gain error(2)
16
20
Bits
Bits
20-bit mode
±15(1)
±60
ppm of FSR
ppm of FSR
ppm/°C
1
±15
1
VOUT = VREF
ppm of FSR
ppm/°C
±150
ppm of FSR
ppm/°C
Gain error drift(3)
2
Power-supply rejection ratio (PSRR)
ANALOG OUTPUT
at DC, dB = –20log(ΔVOUT/ΔVDD
)
60
dB
Output voltage(4)
0
2 × VREF
0.5
V
Output current
mA
pF
Capacitive load
500
±20
Short-circuit current
mA
Short-circuit duration
DYNAMIC PERFORMANCE
Settling time(5)
GND or VDD
Indefinite
To ±0.012%
20-bit mode, to ±0.003%
0.1Hz to 10Hz
1.8
15
1
2
ms
ms
Output noise voltage
REFERENCE INPUT
Input voltage
μVRMS
2.25
2.5
2.75
V
Input impedance
DIGITAL INPUT/OUTPUT
Logic family
100
kΩ
TTL-compatible CMOS
Logic levels (all except XIN
)
VIH
2.0
DVDD + 0.3
0.8
V
V
VIL
–0.3
3.6
VOH
IOH = –0.8mA
IOL = 1.6mA
V
VOL
0.4
±10
2.5
V
Input-leakage current
μA
MHz
XIN frequency range (fXIN
)
0.5
Offset binary two's complement
or straight binary
Data format
User-programmable
POWER-SUPPLY REQUIREMENTS
Power-supply voltage
Supply current
4.75
5.25
V
Analog current
360
140
460
μA
μA
μA
Digital current
Analog current
20-bit mode
(1) Valid from AGND + 20mV to AVDD – 20mV.
(2) Applies after calibration.
(3) Recalibration can remove these errors.
(4) Ideal output voltage; does not take into account gain and offset error.
(5) Valid from AGND + 20mV to AVDD – 20mV. Outside of this range, settling time can be twice the value indicated.
For 16-bit mode, C1 = 2.2nF, C2 = 0.22nF; for 20-bit mode, C1 = 10nF, C2 = 3.3nF.
Copyright © 1998–2009, Texas Instruments Incorporated
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