Datasheet
DAC8218
SBAS460A –MAY 2009–REVISED DECEMBER 2009
www.ti.com
ELECTRICAL CHARACTERISTICS: Single-Supply (continued)
All specifications at T
A
= T
MIN
to T
MAX
, AV
DD
= +32V, AV
SS
= 0V, IOV
DD
= DV
DD
= +5V, REF-A and REF-B = +5V, gain = 6,
AGND-x = DGND = 0V, data format = straight binary, and OFFSET-A = OFFSET-B = AGND, unless otherwise noted.
DAC8218
PARAMETER CONDITIONS MIN TYP MAX UNIT
DACs in the same group 10 nV-s
DAC-to-DAC crosstalk
(10)
DACs among different groups 1 nV-s
Digital crosstalk
(11)
1 nV-s
Digital feedthrough
(12)
1 nV-s
T
A
= +25°C at 10kHz, gain = 6 200 nV/√Hz
Output noise T
A
= +25°C at 10kHz, gain = 4 130 nV/√Hz
0.1Hz to 10Hz, gain = 6 20 μV
PP
Power-supply rejection
(13)
AV
DD
= +33V to +36V 0.05 LSB
ANALOG MONITOR PIN (V
MON
)
Output impedance
(14)
T
A
= +25°C 2 kΩ
Three-state leakage current 100 nA
AUXILIARY ANALOG INPUT
Input range AV
SS
AV
DD
V
Input impedance
T
A
= +25°C 2 kΩ
(AIN-x to V
MON
)
Input capacitance
(15)
4 pF
Input leakage current 30 nA
REFERENCE INPUT
Reference input voltage
1.0 5.5 V
range
(16)
Reference input dc impedance 10 MΩ
Reference input capacitance
(15)
10 pF
DIGITAL INPUT
(15)
IOV
DD
= +4.5V to +5.5V 3.8 0.3 + IOV
DD
V
High-level input voltage, V
IH
IOV
DD
= +2.7V to +3.3V 2.3 0.3 + IOV
DD
V
IOV
DD
= +1.7V to 2.0V 1.5 0.3 + IOV
DD
V
IOV
DD
= +4.5V to +5.5V –0.3 0.8 V
Low-level input voltage, V
IL
IOV
DD
= +2.7V to +3.3V –0.3 0.6 V
IOV
DD
= +1.7V to 2.0V –0.3 0.3 V
CLR, LDAC, RST, CS, and SDI ±1 μA
Input current
USB/BTC, RSTSEL, and GPIO-n ±5 μA
CLR, LDAC, RST, CS, and SDI 5 pF
Input capacitance USB/BTC and RSTSEL 12 pF
GPIO-n 14 pF
(10) DAC-to-DAC crosstalk is the glitch impulse that appears at the output of one DAC as a result of both the full-scale digital code and
subsequent analog output change at another DAC. It is measured with LDAC tied low and expressed in nV-s.
(11) Digital crosstalk is the glitch impulse transferred to the output of one converter as a result of a full-scale code change in the DAC input
register of another converter. It is measured when the DAC output is not updated, and is expressed in nV-s.
(12) Digital feedthrough is the glitch impulse injected to the output of a DAC as a result of a digital code change in the DAC input register of
the same DAC. It is measured with the full-scale digital code change without updating the DAC output, and is expressed in nV-s.
(13) The analog output must not be greater than (AV
DD
– 0.5V).
(14) 8kΩ when V
MON
is connected to Reference Buffer A or B, and 4kΩ when V
MON
is connected to Offset DAC-A or -B.
(15) Specified by design.
(16) Reference input voltage ≤ DV
DD
.
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