Datasheet

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ELECTRICAL CHARACTERISTICS
DAC7821
SBAS365B – OCTOBER 2005 – REVISED JULY 2007
V
DD
= +2.5V to +5.5V; I
OUT
1 = Virtual GND; I
OUT
2 = 0V; V
REF
= +10V; T
A
= full operating temperature. All specifications –40 ° C
to +125 ° C, unless otherwise noted.
DAC7821
PARAMETER CONDITIONS MIN TYP MAX UNITS
STATIC PERFORMANCE
Resolution 12 Bits
Relative accuracy ±1 LSB
Differential nonlinearity ±1 LSB
Output leakage current Data = 000h, T
A
= +25 ° C ±10 nA
Output leakage current Data = 000h, T
A
= T
MAX
±20 nA
Full-scale gain error All is loaded to DAC register ±5 ±10 mV
Full-scale tempco ± 5 ppm/ °C
Output capacitance Code dependent 30 pF
REFERENCE INPUT
V
REF
range –15 15 V
Input resistance 8 10 12 k Ω
R
FB
resistance 8 10 12 k Ω
LOGIC INPUTS AND OUTPUT
(1)
Input low voltage V
IL
V
DD
= +2.7V 0.6 V
V
IL
V
DD
= +5V 0.8 V
Input high voltage V
IH
V
DD
= +2.7V 2.1 V
V
IH
V
DD
= +5V 2.4 V
Input leakage current I
IL
10 µA
Input capacitance C
IL
10 pF
POWER REQUIREMENTS
V
DD
2.7 5.5 V
I
DD
(normal operation) Logic inputs = 0V 5 µA
V
DD
= +4.5V to +5.5V V
IH
= V
DD
and V
IL
= GND 0.8 5 µA
V
DD
= +2.5V to +3.6V V
IH
= V
DD
and V
IL
= GND 0.4 2.5 µA
AC CHARACTERISTICS
Output voltage settling time 0.2 µs
Reference multiplying BW V
REF
= 7V
PP
, Data = FFFh 10 MHz
V
REF
= 0V to 10V,
DAC glitch impulse 5 nV-s
Data = 7FFh to 800h to 7FFh
Feedthrough error V
OUT
/V
REF
Data = 000h, V
REF
= 100kHz –70 dB
Digital feedthrough 2 nV-s
Total harmonic distortion –105 dB
Output spot noise voltage 18 nV/ √ Hz
(1) Specified by design and characterization; not production tested.
3
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