Datasheet

ELECTRICAL CHARACTERISTICS
DAC8234
www.ti.com ........................................................................................................................................... SBAS464A – AUGUST 2009 – REVISED SEPTEMBER 2009
All specifications at T
A
= T
MIN
to T
MAX
, AV
DD
= +11V to +18V, AV
SS
= – 11V to – 18V, V
REF
= REF-A = REF-B = +5V,
DV
DD
= +5V, IOV
DD
= +1.8V to DV
DD
, AGND = DGND = REFGND-A = REFGND-B = SGND-x = 0V, and DAC gain = 4, unless
otherwise noted.
DAC8234
PARAMETER CONDITIONS MIN TYP MAX UNIT
STATIC PERFORMANCE
Bipolar Output
Resolution 14 Bits
Linearity error, INL ± 0.5 LSB
Differential linearity error, DNL ± 0.5 LSB
T
A
= +25 ° C, before user calibration ± 1 LSB
Bipolar zero error
(1)
T
A
= +25 ° C, after user calibration
(2)
± 0.031 LSB
Bipolar zero error TC
(2)
± 0.5 ppm FSR/ ° C
T
A
= +25 ° C, before user calibration ± 1 LSB
Gain error
(1)
T
A
= +25 ° C, after user calibration
(2)
± 0.25 LSB
Gain error TC
(2)
± 0.5 ppm FSR/ ° C
DC crosstalk
(2) (3)
Output unloaded ± 0.1 LSB
Unipolar Output
Resolution 14 Bits
Linearity error, INL AV
DD
= +21V, AV
SS
= – 11V ± 0.5 LSB
Differential linearity error, DNL AV
DD
= +21V, AV
SS
= – 11V ± 0.5 LSB
AV
DD
= +21V, AV
SS
= – 11V, T
A
= +25 ° C, before user
± 1 LSB
calibration
Zero error
AV
DD
= +21V, AV
SS
= – 11V, T
A
= +25 ° C, after user
± 0.031 LSB
calibration
(2)
Zero error TC
(2)
AV
DD
= +21V, AV
SS
= – 11V ± 0.2 ppm FSR/ ° C
AV
DD
= +21V, AV
SS
= – 11V, T
A
= +25 ° C, before user
± 1 LSB
calibration
Gain error
AV
DD
= +21V, AV
SS
= – 11V, T
A
= +25 ° C, after user
± 0.25 LSB
calibration
(2)
Gain error TC
(2)
AV
DD
= +21V, AV
SS
= – 11V ± 0.5 ppm FSR/ ° C
DC crosstalk
(2) (3)
AV
DD
= +21V, AV
SS
= – 11V, output unloaded ± 0.1 LSB
ANALOG OUTPUT (V
OUT
-0 to V
OUT
-3)
AV
DD
= +16.5V, AV
SS
= – 16.5V, V
REF
= +7.5V, gain = 4 – 15 +15 V
Bipolar voltage output
(4)
V
REF
= +5V, gain = 4 – 10 +10 V
Unipolar voltage output
(4)
AV
DD
= +21V, AV
SS
= – 11V, V
REF
= +5V, gain = 4 0 +20 V
Operating for 500 hours at +25 ° C 2 ppm of FSR
Output voltage drift vs time
Operating for 1000 hours at +25 ° C 3 ppm of FSR
Output impedance
(2)
± 3mA load current 0.005 Ω
Short-circuit current
(2) (5)
10 mA
Load current
(4)
Output changes no more than ± 1 LSB ± 3 mA
Capacitive load stability
(2)
700 pF
AV
DD
= +5V to +18V, AV
SS
= – 5V to – 18V,
Power-supply rejection
(2) (4)
± 0.1 LSB
DV
DD
= 5V ± 10%, V
REF
= 2V
(1) See the User Calibration for Zero-Code Error and Gain Error section for details.
(2) Specified by design and characterization.
(3) DC crosstalk is the dc change in the output of one channel as a result of a full-scale code change and subsequent output change on
another channel. The DAC outputs are buffered by op amps that share common AV
DD
and AV
SS
power supplies. Multiple V
DD
and V
SS
terminals are provided to minimize dc crosstalk.
(4) The analog output must not be greater than (AV
DD
– 1.0V) and must not be less than (AV
SS
+ 1.0V).
(5) When the output current is greater than the specification, the current is clamped at the specified maximum value.
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