ꢐ ꢕꢙ ꢚꢋ ꢛꢛ
ꢐ ꢕꢙ ꢚꢋ ꢛꢜ
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SBAS288D − JUNE 2003 − REVISED AUGUST 2004
ELECTRICAL CHARACTERISTICS
All specifications at −40°C to +85°C, AVDD = +5V, DVDD = +1.8V, f
= 7.68MHz, PGA = 1, and V
= +2.5V, unless otherwise noted.
CLKIN
REF
TYP
PARAMETER
Analog Inputs
Full-scale input voltage (AIN − AIN )
TEST CONDITIONS
MIN
MAX
UNIT
2V
/PGA
REF
V
V
V
P
N
Buffer off
Buffer on
AGND − 0.1
AVDD + 0.1
AVDD − 2.0
64
Absolute input voltage
(AIN0-7, AINCOM to AGND)
AGND
1
Programmable gain amplifier
Buffer off, PGA = 1, 2, 4, 8, 16
150/PGA
kΩ
kΩ
MΩ
µA
µA
µA
Buffer off, PGA = 32, 64
(1)
4.7
80
0.5
2
Differential input impedance
Sensor detect current sources
Buffer on, f
≤ 50Hz
DATA
SDCS[1:0] = 01
SDCS[1:0] = 10
SDCS[1:0] = 11
10
System Performance
Resolution
24
24
Bit
Bit
No missing codes
All data rates and PGA settings
= 7.68MHz
(2)
SPS
Data rate (f
)
f
2.5
30,000
0.0010
DATA
CLKIN
(3)
Differential input, PGA = 1
Differential input, PGA = 64
After calibration
0.0003
0.0007
%FSR
Integral nonlinearity
Offset error
%FSR
On the level of the noise
PGA = 1
100
nV/°C
nV/°C
%
Offset drift
PGA = 64
4
After calibration, PGA = 1, Buffer on
After calibration, PGA = 64, Buffer on
PGA = 1
0.005
Gain error
Gain drift
0.03
%
0.8
ppm/°C
ppm/°C
dB
PGA = 64
0.8
(4)
(5)
= 30kSPS
Common-mode rejection
Noise
f
= 60Hz, f
DATA
95
60
110
CM
See Noise Performance Tables
AVDD power-supply rejection
DVDD power-supply rejection
Voltage Reference Inputs
5% ∆ in AVDD
10% ∆ in DVDD
70
dB
dB
100
Reference input voltage (V
)
V
≡ VREFP − VREFN
0.5
2.5
2.6
V
V
REF
REF
Buffer off
Buffer on
Buffer off
Buffer on
AGND − 0.1
AGND
VREFP − 0.5
VREFP − 0.5
AVDD + 0.1
AVDD − 2.0
Negative reference input (VREFN)
Positive reference input (VREFP)
(6)
V
VREFN + 0.5
VREFN + 0.5
V
(6)
V
Voltage reference impedance
f
= 7.68MHz
18.5
kΩ
CLKIN
Digital Input/Output
DIN, SCLK, XTAL1/CLKIN,
SYNC/PDWN, CS, RESET
0.8 DVDD
5.25
V
V
IH
D0/CLKOUT, D1, D2, D3
0.8 DVDD
DGND
DVDD
V
V
V
V
V
0.2 DVDD
IL
I
I
= 5mA
= 5mA
0.8 DVDD
V
OH
OL
OH
OL
0.2 DVDD
V
Input hysteresis
Input leakage
0.5
V
0 < V
DIGITAL INPUT
External crystal between XTAL1 and
XTAL2
< DVDD
10
10
10
µA
2
7.68
7.68
MHz
MHz
Master clock rate
External oscillator driving CLKIN
0.1
3
BB [ BURR-BROWN CORPORATION ]
