ADS1208
www.ti.com
SBAS348A–MARCH 2005–REVISED MARCH 2005
ELECTRICAL CHARACTERISTICS
Over recommended operating free-air temperature range at –40°C to +85°C, AVDD = BVDD = +5V, VREF = internal +2.5V,
Mode 3, MCLK input = 20MHz, differential input voltage = 200mVPP, common-mode voltage = 1.4V, and 16-bit Sinc3 filter with
OSR = 256, unless otherwise noted.
ADS1208I
PARAMETER
TEST CONDITIONS
MIN
TYP(1)
MAX
UNIT
Resolution
16
Bits
DC Accuracy
Integral nonlinearity(2)
Integral nonlinearity
Differential nonlinearity(3)
Input offset(4)
16-bit resolution
16-bit resolution
–8
–0.012
–1.0
1.6
8
0.012
1.0
LSB
%
0.0025
LSB
mV
–2.0
–1.4
2.0
–0.7
15
0
Input offset drift
Gain error(4)
8.0
µV/°C
%
Referenced to voltage at REFIN
Referenced to voltage at REFIN
–1.25
1.25
Gain error drift
ppm/°C
dB
Power-supply rejection ratio
Analog Input
66
Full-scale range
VIN+– VIN–
–125
0.8
125
2.5
mV
V
Operating common-mode signal
Input capacitance
1.4
5.0
95
pF
dB
Common-mode rejection
Current Source (IOUT)
Output current(5)
IOUT
VOUT
1.0
0
5.0
8.0
AVDD – 1.0
520
mA
V
Voltage at IOUT pin
Voltage between AVDD pin and IADJ
Internal Voltage Reference
Reference output voltage
Reference temperature drift
Output resistance
VADJ at IOUT = 1mA to 8mA
480
500
mV
REFOUT
2.45
2.5
20
2.55
3.0
V
ppm/°C
Ω
0.3
Output source current
Power-supply rejection ratio
Startup time
mA
60
dB
0.1
ms
Voltage Reference Input
Reference voltage input
Reference input capacitance
Reference input current
Internal Clock for Modes 0, 1 and 2
Clock frequency
REFIN
0.5
-50
8.0
1.0
3.0
+50
V
5
pF
nA
10.1
12.0
24.0
MHz
MHz
External Clock for Mode 3
Clock frequency
(1) All values are at TA = 25°C.
(2) Integral nonlinearity is defined as the maximum deviation of the line through the end points of the specified input range of the transfer
curve for VIN+– VIN– = –100mV to +100mV, expressed either as the number of LSBs or as a percent of the measured input range
(200mV).
(3) Ensured by design.
(4) Maximum values, including temperature drift, are ensured over the full specified temperature range.
(5) It is possible to leave pin IOUT unconnected (IOUT = 0mA).
3
BB [ BURR-BROWN CORPORATION ]
