4

LTC1598

AC CHARACTERISTICS

temperature range.

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: All voltage values are with respect to GND.

Note 3: This device is specified at 5V. Consult factory for 3V

specified devices.

Note 4: Increased leakage currents at elevated temperatures cause the S/H

Note 6: Linearity error is specified between the actual end points of the

A/D transfer curve.

Note 7: Two on-chip diodes are tied to each reference and analog input

which will conduct for reference or analog input voltages one diode drop

bias of either diode for 4.5V

reference or analog input does not exceed the supply voltage by more than

50mV, the output code will be correct. To achieve an absolute 0V to 5V

input voltage range, it will therefore require a minimum supply voltage of

4.950V over initial tolerance, temperature variations and loading.

Note 8: Recommended operating condition.

Note 9: Channel leakage current is measured after the channel selection.

CH5 (Pin 1): Analog Multiplexer Input.

CH6 (Pin 2): Analog Multiplexer Input.

CH7 (Pin 3): Analog Multiplexer Input.

GND (Pin 4): Analog Ground. GND should be tied directly

to an analog ground plane.

CLK (Pin 5): Shift Clock. This clock synchronizes the serial

data transfer to both MUX and ADC. It also determines the

conversion speed of the ADC.

CS MUX (Pin 6): MUX Chip Select Input. A logic high on

this input allows the MUX to receive a channel address. A

logic low enables the selected MUX channel and connects

it to the MUX OUT pin for A/D conversion. For normal

operation, drive this pin in parallel with CS ADC.

shifted into this input.

COM (Pin 8): Negative Analog Input. This input is the

negative analog input to the ADC and must be free of noise

with respect to GND.

GND (Pin 9): Analog Ground. GND should be tied directly

to an analog ground plane.

CS ADC (Pin 10): ADC Chip Select Input. A logic high on

this input deselects and powers down the ADC and three-

sample the selected channel and start the conversion. For

normal operation drive this pin in parallel with CS MUX.

result is shifted out of this output.

NC (Pin 12): No Connection.

NC (Pin 13): No Connection.

CLK (Pin 14): Shift Clock. This input should be tied to Pin 5.

power to the A/D Converter. It must be bypassed directly

to the analog ground plane.

fines the span of the ADC.

ADC IN (Pin 17): ADC Input. This input is the positive

analog input to the ADC. Connect this pin to MUX OUT for

normal operation.

MUX OUT (Pin 18): MUX Output. This pin is the output of

the multiplexer. Tie to ADC IN for normal operation.

tied to Pin 15.

CH0 (Pin 20): Analog Multiplexer Input.

CH1 (Pin 21): Analog Multiplexer Input.

CH2 (Pin 22): Analog Multiplexer Input.

CH3 (Pin 23): Analog Multiplexer Input.

CH4 (Pin 24): Analog Multiplexer Input.