Datasheet LTC1852, LTC1853 (Analog Devices) - 7

LTC1852/LTC1853
PIN FUNCTIONS CH0 to CH7 (Pins 1 to 8):
Analog Input Pins. Input pins can
A2OUT/S5, A1OUT/S4, A0OUT/S3 (Pins 18 to 20):
Three- be used single ended relative to the analog input common State Digital MUX Address Outputs. Active when RD is low. pin or differentially in pairs (CH0 and CH1, CH2 and CH3, Following a conversion, the MUX address of the present CH4 and CH5, CH6 and CH7). conversion is available on these pins concurrent with the conversion result. In Readback mode, the MUX address of
COM (Pin 9):
Analog Input Common Pin. For single-ended the current sequencer location (S5-S3) is available on these operation (DIFF = 0), COM is the “–” analog input. COM pins. The outputs swing between OV is disabled when DIFF is high. DD and OGND.
D9/S2 (Pin 21, LTC1852):
Three-State Digital Data Output.
REFOUT (Pin 10):
Internal 2.5V Reference Output. Bypass Active when RD is low. Following a conversion, bit 9 of the to analog ground plane with 1μF. present conversion is available on this pin. In Readback
REFIN (Pin 11):
Reference Mode Select/Reference Buffer mode, the unipolar/bipolar bit of the current sequencer Input. REFIN selects the reference mode and acts as the location (S2) is available on this pin. The output swings reference buffer input. REFIN tied to ground (Logic 0) will between OVDD and OGND. produce 2.048V on the REFCOMP pin. REFIN tied to the
D11/S2 (Pin 21, LTC1853):
Three-State Digital Data Output. positive supply (Logic 1) disables the reference buffer Active when RD is low. Following a conversion, bit 11 of to allow REFCOMP to be driven externally. For voltages the present conversion is available on this pin. In Readback between 1V and 2.6V, the reference buffer produces an mode, the unipolar/bipolar bit of the current sequencer output voltage on the REFCOMP pin equal to 1.6384 times location (S2) is available on this pin. The output swings the voltage on REFIN (4.096V on REFCOMP for a 2.5V between OV input on REFIN). DD and OGND.
D8/S1 (Pin 22, LTC1852):
Three-State Digital Data Outputs.
REFCOMP (Pin 12):
Reference Buffer Output. REFCOMP Active when RD is low. Following a conversion, bit 8 of the sets the full-scale input span. The reference buffer produces present conversion is available on this pin. In Readback an output voltage on the REFCOMP pin equal to 1.6384 mode, the gain bit of the current sequencer location (S1) times the voltage on the REFIN pin (4.096V on REFCOMP is available on this pin. The output swings between OV for a 2.5V input on REFIN). REFIN tied to ground will DD and OGND. produce 2.048V on the REFCOMP pin. REFCOMP can be driven externally if REFIN is tied to the positive supply.
D10/S1 (Pin 22, LTC1853):
Three-State Digital Data Bypass to analog ground plane with 10μF tantalum in Outputs. Active when RD is low. Following a conversion, parallel with 0.1μF ceramic or 10μF ceramic. bit 10 of the present conversion is available on this pin. In Readback mode, the gain bit of the current sequencer
GND (Pins 13, 16):
Ground. Tie to analog ground plane. location (S1) is available on this pin. The output swings
VDD (Pins 14, 15):
Positive Supply. Bypass to analog between OVDD and OGND. ground plane with 10μF tantalum in parallel with 0.1μF
D7/S0 (Pin 23, LTC1852):
Three-State Digital Data Outputs. ceramic or 10μF ceramic. Active when RD is low. Following a conversion, bit 7 of the
DIFFOUT/S6 (Pin 17):
Three-State Digital Data Output. present conversion is available on this pin. In Readback Active when RD is low. Following a conversion, the mode, the end of sequence bit of the current sequencer single-ended/differential bit of the present conversion is location (S0) is available on this pin. The output swings available on this pin concurrent with the conversion result. between OVDD and OGND. 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. 18523fa 7