Datasheet

LTC1863L/LTC1867L
7
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1863l7lfe
PIN FUNCTIONS
TYPICAL PERFORMANCE CHARACTERISTICS
(LTC1863L/ LTC1867L)
CODE
0
INL (LSB)
0
0.50
4096
1863L7L G16
–0.50
–1.00
1024
2048
3072
512
1536
2560
3584
1.00
–0.25
0.25
–0.75
0.75
CODE
0
DNL (LSB)
0
0.50
4096
1863L7L G17
–0.50
–1.00
1024
2048
3072
512
1536
2560
3584
1.00
–0.25
0.25
–0.75
0.75
Differential Nonlinearity
vs Output Code (LTC1863L)
Integral Nonlinearity
vs Output Code (LTC1863L)
CHO-CH7/COM (Pins 1-8): Analog Input Pins. Analog
inputs must be free of noise with respect to GND. CH7/
COM can be either a separate channel or the common
minus input for the other channels. Unused channels
should be tied to ground.
REFCOMP (Pin 9): Reference Buffer Output Pin. Bypass
to GND with a 10µF tantalum capacitor in parallel with
a 0.1µF ceramic capacitor (2.5V Nominal). To overdrive
REFCOMP, tie V
REF
to GND.
V
REF
(Pin 10): 1.25V Reference Output. This pin can also
be used as an external reference buffer input for improved
accuracy and drift. Bypass to GND with a 2.2µF tantalum
capacitor in parallel with a 0.1µF ceramic capacitor.
CS/CONV (Pin 11): This input provides the dual function
of initiating conversions on the ADC and also frames the
serial data transfer.
SCK (Pin 12): Shift Clock. This clock synchronizes the
serial data transfer.
SDO (Pin 13): Digital Data Output. The A/D conversion
result is shifted out of this output. Straight binary for-
mat for unipolar mode and two’s complement format for
bipolar mode.
SDI (Pin 14): Digital Data Input Pin. The A/D configuration
word is shifted into this input.
GND (Pin 15): Analog and Digital GND.
V
DD
(Pin 16): Analog and Digital Power Supply. Bypass
to GND with a 10µF tantalum capacitor in parallel with
a 0.1µF ceramic capacitor. When powering up the
LTC1863L/LTC1867L, or any time V
DD
falls below the
minimum specified operating voltage, one dummy con-
version must be initiated by providing a rising edge on the
CS/CONV pin. The first conversion result may be invalid
and should be ignored. Once the CS/CONV pin is returned
low, a DIN word can be shifted into SDI to program the
configuration for the next conversion. Wait at least t7, the
SLEEP Mode Wake-Up Time of 80ms, before initiating the
second conversion to obtain a valid conversion result.
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