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SBAS287A − JUNE 2003 − REVISED SEPTEMBER 2003
ELECTRICAL CHARACTERISTICS
All specifications at T = −40°C to +85°C, AVDD = +5V, DVDD = +3V, f
= 2.4576MHz, and V
= +1.25V, unless otherwise noted.
A
CLK
REF
PARAMETER
Analog Input
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Full-scale input voltage range
Absolute input range
Differential input impedance
System Performance
Resolution
AINP − AINN
AINP, AINN with respect to GND
= 2.4576MHz
2V
REF
V
V
GND + 0.1
24
AVDD − 1.25
f
3
GΩ
CLK
No missing codes
= 2.4576MHz
Bits
(1)
Data rate
f
15
0.0006
1
SPS
CLK
Differential input signal, end point fit
(2)
Integral nonlinearity (INL)
Offset error
0.0015
14
%FSR
ppm of FSR
(3)
Offset error drift
(4)
Gain error
0.01
0.005
0.5
ppm of FSR/°C
0.1
%
ppm/°C
dB
(3)
Gain error drift
At DC
90
100
100
60
100
(5)
f
f
f
f
= 50 1Hz, f
= 2.4576MHz
= 2.4576MHz
dB
Common-mode rejection
CM
CM
SIG
SIG
CLK
= 60 1Hz, f
(6)
dB
CLK
= 50 1Hz, f
= 2.4576MHz
CLK
= 2.4576MHz
dB
Normal-mode rejection
Input referred noise
= 60 1Hz, f
70
dB
CLK
ppm of FSR,
RMS
2
Analog power-supply rejection
Digital power-supply rejection
Voltage Reference Input
At DC, ∆AVDD = 5%
At DC, ∆AVDD = 5%
100
100
dB
dB
(7)
Reference input voltage (V
)
V
≡ VREFP − VREFN
0.5
1.25
1
AVDD
V
V
REF
REF
Negative reference input (VREFN)
Positive reference input (VREFP)
Voltage reference impedance
Digital Input/Output
GND − 0.1
VREFP − 0.5
AVDD + 0.1
VREFN + 0.5
V
f
= 2.4576MHz
MΩ
CLK
V
V
V
V
(CLK, SCLK)
(CLK, SCLK)
0.8 DVDD
GND
5.25
0.2 DVDD
DVDD
DVDD + 0.4
10
V
V
IH
IL
Logic levels
(DRDY, DOUT)
(DRDY, DOUT)
I
I
= 1mA
= 1mA
DVDD − 0.4
GND
V
OH
OH
V
OL
OL
Input leakage (CLK, SCLK)
0 < (CLK, SCLK) < DVDD
µA
MHz
%
CLK frequency (f
CLK duty cycle
Power Supply
AVDD
)
6
CLK
30
70
2.7
1.8
5.25
3.6
1
V
V
DVDD
Sleep mode
0.1
152
158
0.1
1.6
5
µA
µA
µA
µA
µA
µA
mW
AVDD = 3V
AVDD current
DVDD current
AVDD = 5V
250
Sleep mode, CLK stopped
Sleep mode, 2.4576MHZ CLK running
DVDD = 3V
5
10
Total power dissipation
AVDD = DVDD = 3V
0.47
(1)
(2)
(3)
(4)
SPS = samples per second.
FSR = full-scale range = 4V
REF
Recalibration can reduce these errors to the level of the noise.
.
Achieving specified gain error performance requires that calibration be performed with reference voltage input between (GND + 0.1V) and
(AVDD − 1.25V). See Voltage Reference Inputs section.
(5)
(6)
(7)
f
f
is the frequency of the common-mode input.
is the frequency of the input signal.
CM
SIG
It will not be possible to reach the digital output full-scale code when V > 2V
.
IN REF
3
BB [ BURR-BROWN CORPORATION ]
