Datasheet

3
LTC1854/LTC1855/LTC1856
185456fa
PARAMETER CONDITIONS MIN TYP MAX UNITS
Analog Input Range CH0 to CH7, COM ±10 V
ADC
+
, ADC
–
(Note 3) ADC
–
±2.048 V
Impedance CH0 to CH7, COM 31 kW
MUXOUT
+
, MUXOUT
–
5kW
Capacitance CH0 to CH7, COM 5 pF
Sample Mode ADC
+
, ADC
–
12 pF
Hold Mode ADC
+
, ADC
–
4pF
Input Leakage Current ADC
+
, ADC
–
, CONVST = Low ● ±1 mA
The ● denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25∞C. (Note 5)
A ALOG I PUT
UU
The ● denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25∞C. MUXOUT connected to ADC inputs. (Note 5)
DY A IC ACCURACY
U
W
LTC1854 LTC1855 LTC1856
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
S/(N + D) Signal-to-(Noise + Distortion) Ratio 1kHz Input Signal 74 83 87 dB
THD Total Harmonic Distortion 1kHz Input Signal, –102 –95 –101 dB
First Five Harmonics
Peak Harmonic or Spurious Noise 1kHz Input Signal –99 –99 –103 dB
Channel-to-Channel Isolation 1kHz Input Signal –120 –120 –120 dB
–3dB Input Bandwidth 1 1 1 MHz
Aperture Delay –70 –70 –70 ns
Aperture Jitter 60 60 60 ps
Transient Response Full-Scale Step 4 4 4 ms
(Note 9)
Overvoltage Recovery (Note 12) 150 150 150 ns