Datasheet

DAC1220
www.ti.com ...................................................................................................................................... SBAS082G –FEBRUARY 1998–REVISED SEPTEMBER 2009
ELECTRICAL CHARACTERISTICS
All specifications at T
MIN
to T
MAX
, AV
DD
= DV
DD
= +5V, f
XIN
= 2.5MHz, V
REF
= +2.5V, and 16-bit mode, unless otherwise noted.
DAC1220E
PARAMETER CONDITIONS MIN TYP MAX UNIT
ACCURACY
Monotonicity 16 Bits
Monotonicity 20-bit mode 20 Bits
Linearity error ±15
(1)
ppm of FSR
Unipolar offset error and gain error
(2)
±60 ppm of FSR
Unipolar offset error drift
(3)
1 ppm/°C
Bipolar zero offset error
(2)
V
OUT
= V
REF
±15 ppm of FSR
Bipolar zero offset drift
(3)
1 ppm/°C
Gain error
(2)
±150 ppm of FSR
Gain error drift
(3)
2 ppm/°C
Power-supply rejection ratio (PSRR) at DC, dB = –20log(ΔV
OUT
/ΔV
DD
) 60 dB
ANALOG OUTPUT
Output voltage
(4)
0 2 × V
REF
V
Output current 0.5 mA
Capacitive load 500 pF
Short-circuit current ±20 mA
Short-circuit duration GND or V
DD
Indefinite
DYNAMIC PERFORMANCE
Settling time
(5)
To ±0.012% 1.8 2 ms
20-bit mode, to ±0.003% 15 ms
Output noise voltage 0.1Hz to 10Hz 1 μV
RMS
REFERENCE INPUT
Input voltage 2.25 2.5 2.75 V
Input impedance 100 kΩ
DIGITAL INPUT/OUTPUT
Logic family TTL-compatible CMOS
Logic levels (all except X
IN
)
V
IH
2.0 DV
DD
+ 0.3 V
V
IL
–0.3 0.8 V
V
OH
I
OH
= –0.8mA 3.6 V
V
OL
I
OL
= 1.6mA 0.4 V
Input-leakage current ±10 μA
X
IN
frequency range (f
XIN
) 0.5 2.5 MHz
Offset binary two's complement
Data format User-programmable
or straight binary
POWER-SUPPLY REQUIREMENTS
Power-supply voltage 4.75 5.25 V
Supply current
Analog current 360 μA
Digital current 140 μA
Analog current 20-bit mode 460 μA
(1) Valid from AGND + 20mV to AV
DD
– 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 AV
DD
– 20mV. Outside of this range, settling time can be twice the value indicated.
For 16-bit mode, C
1
= 2.2nF, C
2
= 0.22nF; for 20-bit mode, C
1
= 10nF, C
2
= 3.3nF.
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