Datasheet
ELECTRICAL CHARACTERISTICS: AV
DD
= 2.7V
DAC9881
www.ti.com
......................................................................................................................................................... SBAS438A – MAY 2008 – REVISED AUGUST 2008
All specifications at T
A
= T
MIN
to T
MAX
, AV
DD
= +2.7V to +3.3V, IOV
DD
= +1.8V to AV
DD
, V
REFH
= 2.5V, V
REFL
= 0V and gain =
1X mode, unless otherwise noted.
DAC9881
PARAMETER CONDITIONS MIN TYP MAX UNIT
ACCURACY
(1)
Measured by line DAC9881S ± 2.5 ± 3.5 LSB
passing through
Integral linearity error
codes 2048 and
DAC9881SB ± 2 ± 3 LSB
262143
Measured by line DAC9881S ± 1 ± 2 LSB
passing through
Differential linearity error
codes 2048 and
DAC9881SB ± 0.75 ± 1.5 LSB
262143
T
A
= +25 ° C, code = 2048 ± 32 LSB
Zero-scale error
T
MIN
to T
MAX
, code = 2048 ± 64 LSB
Zero-scale drift
(2)
Code = 2048 ± 0.5 ± 1.6 ppm/ ° C of FSR
T
A
= +25 ° C, measured by line passing through codes 2048
Gain error ± 32 ± 64 LSB
and 262143
Gain temperature drift
(2)
Measured by line passing through codes 2048 and 262143 ± 0.5 ± 0.8 ppm/ ° C
PSRR
(2)
V
OUT
= full-scale, AV
DD
= +3V ± 10% 64 LSB/V
ANALOG OUTPUT
(2)
Voltage output
(3)
0 AV
DD
V
Device operating for 500 hours at +25 ° C 0.2 ppm of FSR
Output voltage drift vs time
Device operating for 1000 hours at +25 ° C 0.4 ppm of FSR
Output current
(4)
2.5 mA
Maximum load capacitance 200 pF
Short-circuit current +31/ – 50 mA
REFERENCE INPUT
(2)
V
REFH
input voltage range AV
DD
= +3V 1.25 2.5 AV
DD
V
V
REFH
input capacitance 5 pF
V
REFH
input impedance 4.5 k Ω
V
REFL
input voltage range – 0.2 0 +0.2 V
V
REFL
input capacitance 4.5 pF
V
REFL
input impedance 5 k Ω
DYNAMIC PERFORMANCE
(2)
To ± 0.003% FS, R
L
= 10k Ω , C
L
= 50pF, code 04000h to
Settling time 5 µ s
3C000h
Slew rate From 10% to 90% of 0V to +2.5V 2.5 V/ µ s
V
REFH
= 2.5V, gain = 1X mode 18 nV-s
Code = 1FFFFh to
Code change glitch V
REFH
= 1.25V, gain = 1X mode 9 nV-s
20000h to 1FFFFh
V
REFH
= 1.25V, gain = 2X mode 10 nV-s
Digital feedthrough CS = high, f
SCLK
= 1kHz 1 nV-s
Gain = 1 24 30 nV/ √ Hz
f = 1kHz to 100kHz,
Output noise voltage density
full-scale output
Gain = 2 40 48 nV/ √ Hz
Output noise voltage f = 0.1Hz to 10Hz, full-scale output 2 µ V
PP
(1) DAC output range is 0V to +2.5V. 1LSB = 9.5 µ V.
(2) Ensured by design. Not production tested.
(3) The output from the V
OUT
pin = [(V
REFH
– V
REFL
)/262144] × CODE × Buffer GAIN + V
REFL
. The maximum range of V
OUT
is 0V to AV
DD
.
The full-scale of the output must be less than AV
DD
; otherwise, output saturation occurs.
(4) Refer to Figure 55 , Figure 56 , and Figure 57 for details.
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