Datasheet

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SLAS235B − JULY 1999 − REVISED APRIL 2004
4
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electrical characteristics over recommended operating conditions (unless otherwise noted)
power supply
PARAMETER TEST CONDITIONS MIN TYP MAX
UNIT
I
DD
Power supply current
No load,
All inputs = AGND or V
DD
,
Fast 2.3 3.3
mA
I
DD
Power supply current
All inputs = AGND or V
DD
,
DAC latch = 0x800
Slow 1.5 1.9
mA
Power down supply current See Figure 8 0.01 10 µA
PSRR
Power supply rejection ratio
Zero scale, See Note 2 −65
dB
PSRR Power supply rejection ratio
Full scale, See Note 3 −65
dB
NOTES: 2. Power supply rejection ratio at zero scale is measured by varying V
DD
and is given by:
PSRR = 20 log [(E
ZS
(V
DD
max) − E
ZS
(V
DD
min))/V
DD
max]
3. Power supply rejection ratio at full scale is measured by varying V
DD
and is given by:
PSRR = 20 log [(E
G
(V
DD
max) − E
G
(V
DD
min))/V
DD
max]
static DAC specifications
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Resolution 8 bits
INL Integral nonlinearity, end point adjusted See Note 4 ± 0.3 ± 0.5 LSB
DNL Differential nonlinearity See Note 5 ± 0.07 ± 0.2 LSB
E
ZS
Zero-scale error (offset error at zero scale) See Note 6 ±20 mV
E
ZS
TC Zero-scale-error temperature coefficient See Note 7 10 ppm/°C
E
G
Gain error See Note 8 ± 0.6
% full
scale V
E
G
T
C
Gain error temperature coefficient See Note 9 10 ppm/°C
NOTES: 4. The relative accuracy or integral nonlinearity (INL) sometimes referred to as linearity error, is the maximum deviation of the output
from the line between zero and full scale excluding the effects of zero code and full-scale errors. Tested from code 10 to code 255.
5. The differential nonlinearity (DNL) sometimes referred to as differential error, is the difference between the measured and ideal 1
LSB amplitude change of any two adjacent codes. Monotonic means the output voltage changes in the same direction (or remains
constant) as a change in the digital input code. Tested from code 10 to code 255.
6. Zero-scale error is the deviation from zero voltage output when the digital input code is zero.
7. Zero-scale-error temperature coefficient is given by: E
ZS
TC = [E
ZS
(T
max
) − E
ZS
(T
min
)]/V
ref
× 10
6
/(T
max
− T
min
).
8. Gain error is the deviation from the ideal output (2V
ref
− 1 LSB) with an output load of 10 kΩ excluding the effects of the zero-error.
9. Gain temperature coefficient is given by: E
G
TC = [E
G
(T
max
) − E
G
(T
min
)]/V
ref
× 10
6
/(T
max
− T
min
).
output specifications
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
O
Output voltage R
L
= 10 kΩ 0 V
DD
−0.4 V
Output load regulation accuracy V
O
= 4.096 V, 2.048 V R
L
= 2 kΩ ± 0.10 ± 0.25
% full
scale V
reference pin configured as output (REF)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
ref(OUTL)
Low reference voltage 1.003 1.024 1.045 V
V
ref(OUTH)
High reference voltage V
DD
> 4.75 V 2.027 2.048 2.069 V
I
ref(source)
Output source current 1 mA
I
ref(sink)
Output sink current −1 mA
Load capacitance 1 10 ωF
PSRR Power supply rejection ratio −65 dB