LTC1851 查看數據表（PDF） - Linear Technology
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LTC1851 Datasheet PDF : 28 Pages
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LTC1850/LTC1851
PI FU CTIO S
CH0 to CH7 (Pins 1 to 8): Analog Input Pins. Input pins can
be used single ended relative to the analog input common
pin (COM) or differentially in pairs (CH0 and CH1, CH2 and
CH3, CH4 and CH5, CH6 and CH7).
COM (Pin 9): Analog Input Common Pin. For single-ended
operation (DIFF = 0), COM is the “–” analog input. COM is
disabled when DIFF is high.
REFOUT (Pin 10): Internal 2.5V Reference Output. Re-
quires bypass to analog ground plane with 1µF.
REFIN (Pin 11): Reference Mode Select/Reference Buffer
Input. REFIN selects the Reference mode and acts as the
reference buffer Input. REFIN tied to ground will produce
2.048V on the REFCOMP pin. REFIN tied to the positive
supply disables the reference buffer to allow REFCOMP to
be driven externally. For voltages between 1V and 2.6V,
the reference buffer produces an output voltage on the
REFCOMP pin equal to 1.6384 times the voltage on REFIN
(4.096V on REFCOMP for a 2.5V input on REFIN).
REFCOMP (Pin 12): Reference Buffer Output. REFCOMP
sets the full-scale input span. The reference buffer pro-
duces an output voltage on the REFCOMP pin equal to
1.6384 times the voltage on the REFIN pin (4.096V on
REFCOMP for a 2.5V input on REFIN). REFIN tied to
ground will produce 2.048V on the REFCOMP pin.
REFCOMP can be driven externally if REFIN is tied to the
positive supply. Requires bypass to analog ground plane
with 10µF tantalum in parallel with 0.1µF ceramic or 10µF
ceramic.
GND (Pin 13): Ground. Tie to analog ground plane.
VDD (Pin 14): 5V Supply. Short to Pin 15.
VDD (Pin 15): 5V Supply. Bypass to GND with 10µF
tantalum in parallel with 0.1µF ceramic or 10µF ceramic.
GND (Pin 16): Ground for Internal Logic. Tie to analog
ground plane.
DIFFOUT/S6 (Pin 17): Three-State Digital Data Output.
Active when RD is low. Following a conversion, the single-
ended/differential bit of the present conversion is available
on this pin concurrent with the conversion result. In
Readback mode, the single-ended/differential bit of the
current sequencer location (S6) is available on this pin.
The output swings between OVDD and OGND.
A2OUT/S5, A1OUT/S4, A0OUT/S3 (Pins 18 to 20): Three-
State Digital MUX Address Outputs. Active when RD is
low. Following a conversion, the MUX address of the
present conversion is available on these pins concurrent
with the conversion result. In Readback mode, the MUX
address of the current sequencer location (S5-S3) is
available on these pins. The outputs swing between OVDD
and OGND.
D9/S2 (Pin 21, LTC1850): Three-State Digital Data Out-
put. Active when RD is low. Following a conversion, bit 9
of the present conversion is available on this pin. In
Readback mode, the unipolar/bipolar bit of the current
sequencer location (S2) is available on this pin. The output
swings between OVDD and OGND.
D11/S2 (Pin 21, LTC1851): Three-State Digital Data Out-
put. Active when RD is low. Following a conversion, bit 11
of the present conversion is available on this pin. In
Readback mode, the unipolar/bipolar bit of the current
sequencer location (S2) is available on this pin. The output
swings between OVDD and OGND.
D8/S1 (Pin 22, LTC1850): Three-State Digital Data Out-
puts. Active when RD is low. Following a conversion, bit 8
of the present conversion is available on this pin. In
Readback mode, the gain bit of the current sequencer
location (S1) is available on this pin. The output swings
between OVDD and OGND.
D10/S1 (Pin 22, LTC1851): Three-State Digital Data Out-
puts. Active when RD is low. Following a conversion, bit 10
of the present conversion is available on this pin. In
Readback mode, the gain bit of the current sequencer
location (S1) is available on this pin. The output swings
between OVDD and OGND.
D7/S0 (Pin 23, LTC1850): Three-State Digital Data Out-
puts. Active when RD is low. Following a conversion, bit 7
of the present conversion is available on this pin. In
Readback mode, the end of sequence bit of the current
sequencer location (S0) is available on this pin. The output
swings between OVDD and OGND.
18501f
10
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