Datasheet

LTC1863L/LTC1867L
3
1863l7lfc
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. V
DD
= 2.7V, external V
REF
= 1.25V (Notes 5, 6)
PARAMETER CONDITIONS
LTC1863L LTC1867L LTC1867LA
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
Gain Error Unipolar
Bipolar
±6
±6
±96
±96
±64
±64
LSB
LSB
Gain Error Match Unipolar
Bipolar
±1
±1
±4
±4
±3
±3
LSB
LSB
Gain Error Tempco Internal Reference
External Reference
±20
±3
±20
±3
±20
±3
ppm/°C
ppm/°C
Power Supply Sensitivity V
DD
= 2.7V – 3.6V ±1 ±3 ±3 LSB
DYNAMIC ACCURACY
V
DD
= 3V, external V
REF
= 1.25V (Note 5)
SYMBOL PARAMETER CONDITIONS
LTC1863L LTC1867L/LTC1867LA
UNITSMIN TYP MAX MIN TYP MAX
SNR Signal-to-Noise Ratio 1kHz Input Signal 73.1 83.7 dB
S/(N+D) Signal-to-(Noise + Distortion) Ratio 1kHz Input Signal 73 83.1 dB
THD Total Harmonic Distortion 1kHz Input Signal, Up to 5th Harmonic –91.8 – 92.3 dB
Peak Harmonic or Spurious Noise 1kHz Input Signal –94.8 –95.1 dB
Channel-to-Channel Isolation 100kHz Input Signal –100 –112 dB
Full Power Bandwidth –3dB Point 1.25 1.25 MHz
ANALOG INPUT
SYMBOL PARAMETER CONDITIONS
LTC1863L/LTC1867L/LTC1867LA
UNITSMIN TYP MAX
Analog Input Range Unipolar Mode (Note 9)
Bipolar Mode
●
●
0 to 2.5
±1.25
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
●
2.01 1.68 μs
Input Leakage Current On Channels, CHX = 0V or V
DD
●
±1 μA
The ● denotes the specifi cations which apply over the full operating temperature range, otherwise
specifi cations are at T
A
= 25°C. (Note 5)
DIGITAL INPUTS AND DIGITAL OUTPUTS
SYMBOL PARAMETER CONDITIONS
LTC1863L/LTC1867L/LTC1867LA
UNITSMIN TYP MAX
V
IH
High Level Input Voltage V
DD
= 3.6V
●
1.9 V
V
IL
Low Level Input Voltage V
DD
= 2.7V
●
0.45 V
The ● denotes the specifi cations which apply over the
full operating temperature range, otherwise specifi cations are at T
A
= 25°C. (Note 5)
INTERNAL REFERENCE CHARACTERISTICS
PARAMETER CONDITIONS
LTC1863L/LTC1867L/LTC1867LA
UNITSMIN TYP MAX
V
REF
Output Voltage I
OUT
= 0 1.235 1.25 1.265 V
V
REF
Output Tempco I
OUT
= 0 ±20 ppm/°C
V
REF
Line Regulation 2.7V ≤ V
DD
≤ 3.6V 0.3 mV/V
V
REF
Output Resistance ⏐I
OUT
⏐ ≤0.1mA 3 kΩ
REFCOMP Output Voltage I
OUT
= 0 2.5 V
(Note 5)