Datasheet

LTC1863/LTC1867
3
18637fa
SYMBOL PARAMETER CONDITIONS
LTC1863 LTC1867/LTC1867A
UNITSMIN TYP MAX MIN TYP MAX
SNR Signal-to-Noise Ratio 1kHz Input Signal 73.6 89 dB
S/(N+D) Signal-to-(Noise + Distortion) Ratio 1kHz Input Signal 73.5 88 dB
THD Total Harmonic Distortion 1kHz Input Signal, Up to 5th Harmonic –94.5 –95 dB
Peak Harmonic or Spurious Noise 1kHz Input Signal –94.5 –95 dB
Channel-to-Channel Isolation 100kHz Input Signal –100 –117 dB
Full Power Bandwidth –3dB Point 1.25 1.25 MHz
DYNAMIC ACCURACY
SYMBOL PARAMETER CONDITIONS
LTC1863/LTC1867/LTC1867A
UNITSMIN TYP MAX
Analog Input Range Unipolar Mode (Note 9)
Bipolar Mode
l
l
0-4.096
±2.048
V
V
C
IN
Analog Input Capacitance for CH0 to
CH7/COM
Between Conversions (Sample Mode)
During Conversions (Hold Mode)
32
4
pF
pF
t
ACQ
Sample-and-Hold Acquisition Time
l
1.5 1.1 μs
Input Leakage Current On Channels, CHX = 0V or V
DD
l
±1 μA
ANALOG INPUT
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)
PARAMETER CONDITIONS
LTC1863/LTC1867/LTC1867A
UNITSMIN TYP MAX
V
REF
Output Voltage I
OUT
= 0 2.48 2.5 2.52 V
V
REF
Output Tempco I
OUT
= 0 ±15 ppm/°C
V
REF
Line Regulation 4.75V ≤ V
DD
≤ 5.25V 0.43 mV/V
V
REF
Output Resistance ⏐I
OUT
⏐ ≤0.1mA 6 kΩ
REFCOMP Output Voltage I
OUT
= 0 4.096 V
INTERNAL REFERENCE CHARACTERISTICS
(Note 5)
SYMBOL PARAMETER CONDITIONS
LTC1863/LTC1867/LTC1867A
UNITSMIN TYP MAX
V
IH
High Level Input Voltage V
DD
= 5.25V
l
2.4 V
V
IL
Low Level Input Voltage V
DD
= 4.75V
l
0.8 V
I
IN
Digital Input Current V
IN
= 0V to V
DD
l
±10 μA
DIGITAL INPUTS AND DIGITAL OUTPUTS
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)
CONVERTER CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. With external reference (Notes 5, 6)
PARAMETER CONDITIONS
LTC1863 LTC1867 LTC1867A
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
Gain Error Match ±1 ±4 ±2 LSB
Gain Error Tempco Internal Reference
External Reference
±15
±2.7
±15
±2.7
±15
±2.7
ppm/°C
ppm/°C
Power Supply Sensitivity V
DD
= 4.75V – 5.25V ±1 ±5 ±5 LSB
(Note 5)