Datasheet LTC1091, LTC1092, LTC1093, LTC1094 (Analog Devices) - 8

LTC1091/LTC1092 LTC1093/LTC1094
W U TYPICAL PERFOR A CE CH C ARA TERISTICS LTC1092/LTC1093/LTC1094 LTC1093/LTC1094 Input Channel Reference Current vs Temperature Leakage Current vs Temperature
0.6 1000 VREF = 5V 900 GUARANTEED 0.5 800 700 0.4 600 0.3 500 400 0.2 300 REFERENCE CURRENT (mA) ON-CHANNEL 200 0.1 OFF-CHANNEL 100 INPUT CHANNEL LEAKAGE CURRENT (nA) 0 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 AMBIENT TEMPERATURE (°C) AMBIENT TEMPERATURE (°C) 1091/2/3/4 G28 1091/2/3/4 G29
U U U PI FU CTIO S LTC1091/LTC1092 CS (Pin 1):
Chip Select Input. A logic low on this input
VCC (Pin 8 )(LTC1092):
Positive Supply Voltage. This pin enables the LTC1091/LTC1092. provides power to the A/D converter. It must be kept free of noise and ripple by bypassing directly to the analog
CH0, CH1/+ IN, – IN (Pins 2, 3):
Analog Inputs. These ground plane. inputs must be free of noise with respect to GND.
GND (Pin 4):
Analog Ground. GND should be tied directly
LTC1093/LTC1094
to an analog ground plane.
CH0 to CH5/CH0 to CH7 (Pins 1 to 6/Pins 1 to 8):
Analog
D
Inputs. The analog inputs must be free of noise with
IN (Pin 5)(LTC1091):
Digital Data Input. The multiplexer address is shifted into this input. respect to AGND.
V COM (Pin 7/Pin 9):
Common. The common pin defines the
REF (Pin 5)(LTC1092):
Reference Input. The reference input defines the span of the A/D converter and must be zero reference point for all single-ended inputs. It must be kept free of noise with respect to AGND. free of noise and is usually tied to the analog ground plane.
D DGND (Pin 8/Pin 10):
Digital Ground. This is the ground
OUT (Pin 6):
Digital Data Output. The A/D conversion result is shifted out of this output. for the internal logic. Tie to the ground plane.
CLK (Pin 7):
Shift Clock. This clock synchronizes the serial
V – (Pin 9/Pin 11):
Negative Supply. Tie V – to most data transfer. negative potential in the circuit. (Ground in single supply applications.)
VCC(VREF)(Pin 8)(LTC1091):
Positive Supply and Refer- ence Voltage. This pin provides power and defines the
AGND (Pin 10/Pin 12):
Analog Ground. AGND should be span of the A/D converter. It must be kept free of noise and tied directly to the analog ground plane. ripple by bypassing directly to the analog ground plane. 8