Datasheet

LTC1857/LTC1858/LTC1859
3
185789fa
The l denotes the specifi cations which
apply over the full operating temperature range, otherwise specifi cations are at T
A
= 25°C. MUXOUT connected to ADC inputs. (Notes 5, 6)
CONVERTER AND MULTPLEXER CHARACTERISTICS
PARAMETER CONDITIONS
LTC1857 LTC1858 LTC1859
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
Resolution
l
12 14 16 Bits
No Missing Codes
l
12 14 15 Bits
Transition Noise 0.06 0.26 1 LSB
RMS
Integral Linearity Error (Notes 7, 15)
l
±1 ±1.5 ±3 LSB
Differential Linearity Error (Note 15)
l
–1 1 –1 1.5 –2 4 LSB
Bipolar Zero Error (Note 8)
l
±9 ±17 ±28 LSB
Bipolar Zero Error Drift ±0.1 ±0.1 ±0.1 ppm/°C
Bipolar Zero Error Match ±4 ±6 ±10 LSB
Unipolar Zero Error (Note 8)
l
±6 ±15 ±25 LSB
Unipolar Zero Error Drift ±1 ±1 ±1 ppm/°C
Unipolar Zero Error Match ±1.2 ±2 ±8 LSB
Bipolar Full-Scale Error External Reference (Note 11)
Internal Reference (Note 11)
l
±0.35
±0.45
±0.15
±0.4
±0.1
±0.4
%
%
Bipolar Full-Scale Error Drift External Reference
Internal Reference
±2.5
±7
±2.5
±7
±2.5
±7
ppm/°C
ppm/°C
Bipolar Full-Scale Error Match ±5 ±10 ±15 LSB
Unipolar Full-Scale Error External Reference (Note 11)
Internal Reference (Note 11)
l
±0.45
±0.75
±0.25
±0.85
±0.2
±0.75
%
%
Unipolar Full-Scale Error Drift External Reference
Internal Reference
±2.5
±7
±2.5
±7
±2.5
±7
ppm/°C
ppm/°C
Unipolar Full-Scale Error Match ±5 ±12 ±15 LSB
Input Common Mode Range Unipolar Mode
Bipolar Mode
l
l
0 to 10
±10
0 to 10
±10
0 to 10
±10
V
V
Input Common Mode Rejection Ratio 96 96 96 dB
The l denotes the specifi cations which apply over the full operating temperature range, otherwise
specifi cations are at T
A
= 25°C. (Note 5)
ANALOG INPUT
PARAMETER CONDITIONS MIN TYP MAX UNITS
Analog Input Range CH0 to CH7, COM 0 to 5, 0 to 10
±5, ±10
V
V
ADC
+
, ADC
–
(Note 3) 0 to 2.048
0 to 4.096
ADC
–
±1.024
ADC
–
±2.048
V
V
V
V
Impedance CH0 to CH7, COM
Unipolar
Bipolar
42
31
kΩ
kΩ
MUXOUT
+
, MUXOUT
–
Unipolar
Bipolar
10
5
kΩ
kΩ
ADC
+
, ADC
–
Hi-Z kΩ
Capacitance CH0 to CH7, COM 5 pF
Sample Mode ADC
+
, ADC
–
0V to 2.048V, ±1.024V
0V to 4.096V, ±2.048V
24
12
pF
pF
Hold Mode ADC
+
, ADC
–
4pF
Input Leakage Current ADC
+
, ADC
–
, CONVST = Low
l
±1 μA