ADS1232
ADS1234
www.ti.com
SBAS350–JUNE 2005
ELECTRICAL CHARACTERISTICS: VREF = +5V
All specifications TA = –40°C to +105°C, AVDD = DVDD = VREFP = +5V, VREFN = AGND, Internal Oscillator, SPEED =
Low, Gain = 64 (unless otherwise specified).
ADS1232, ADS1234
PARAMETER
Analog Inputs
CONDITIONS
MIN
TYP
MAX
UNIT
Full-Scale Input Voltage
(AINP - AINN)
±0.5VREF/Gain
V
V
AINxP or AINxN
with respect to GND, Gain = 1
AGND – 0.1
AVDD + 0.1
Common-mode Input Range
Gain = 64, 128
(0.5)AVDD – 1
(0.5)AVDD + 1
V
Gain = 1, 2
500
50
nA
nA
Differential Input Current
Gain = 64, 128
System Performance
Resolution
No missing codes
24
TBD
TBD
Bits
SPS
Internal Oscillator, SPEED = High
Internal Oscillator, SPEED = Low
External Oscillator, SPEED = High
External Oscillator, SPEED = Low
Full Settling
80
TBD
TBD
10
fCLK / 61440
fCLK / 491520
4
SPS
Conversion Rate
SPS
SPS
Digital Filter Settling Time
Integral Non-Linearity (INL)
Conversions
Differential input, End point fit
Gain = 1, 2
±0.0002
±0.0010
±0.0015
% of FSR(1)
Differential input, End point fit
Gain = 64, 128
TBD
% of FSR
Gain = 1
±0.2
±2
TBD
TBD
ppm of FS
ppm of FS
µV/°C
nV/°C
%
Input Offset Error(2)
Input Offset Error Drift
Gain Error(3)
Gain = 64
Gain = 1
1
Gain = 64
15
Gain = 1
0.001
0.001
0.5
TBD
TBD
Gain = 64
%
Gain = 1
ppm/°C
ppm/°C
dB
Gain Error Drift
Gain = 64
±4
Internal oscillator, 50Hz and 60Hz
100
120
110
Normal-mode Rejection(4)
External oscillator,
50Hz and 60Hz, ±1Hz
130
dB
at DC, Gain = 1, ∆VDD = 1V
TBD
TBD
100
75
dB
dB
Common-mode Rejection
Input-Referred Noise
at DC, Gain = 64, ∆VDD = 0.1V
See Noise Performance Tables
at DC, Gain = 1, ∆VDD = 1V
TBD
TBD
100
85
dB
dB
Power-Supply Rejection
at DC, Gain = 64, ∆VDD = 0.1V
Voltage Reference Input
Voltage Reference Input
VREF = VREFP - VREFN
1
AGND – 0.1
VREFN + 1.0
AVDD AVDD + 0.1V
VREFP – 1.0
AVDD + 0.1
50
V
V
(VREF
)
Negative Reference Input
(VREFN)
Positive Reference Input
(VREFP)
V
Voltage Reference
Input Current
nA
(1) FSR = full scale range = VREF/Gain
(2) Offset calibration can minimize these errors to the level of noise at any temperature.
(3) Gain errors are calibrated at the factory (AVDD = +5V, all gains, TA = +25°C).
(4) Specification is assured by the combination of design and final production test.
3
BB [ BURR-BROWN CORPORATION ]
