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LTC1594LIS Datasheet(PDF) 10 Page - Linear Technology |
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LTC1594LIS Datasheet(HTML) 10 Page - Linear Technology |
10 / 24 page 10 LTC1594L/LTC1598L APPLICATIONS INFORMATION OVERVIEW The LTC1594L/LTC1598L are 3V micropower, 12-bit sampling A/D converters that feature 4- and 8-channel multiplexers respectively. They typically draw only 160 µA of supply current when sampling at 10.5kHz. Supply current drops linearly as the sample rate is reduced (see Supply Current vs Sample Rate). The ADCs automatically power down when not performing conversions, drawing only leakage current. The LTC1594L is available in a 16-pin narrow SO package and the LTC1598L is pack- aged in a 24-pin SSOP. Both devices operate on a single supply from 2.7V to 3.6V. The LTC1594L/LTC1598L contain a 12-bit, switched- capacitor ADC, sample-and-hold, serial port and an external reference input pin. In addition, the LTC1594L has a 4-channel multiplexer and the LTC1598L provides an 8-channel multiplexer (see Block Diagram). They can measure signals floating on a DC common mode voltage and can operate with reduced spans to 1.5V. Reducing the spans allow them to achieve 366 µV resolution. The LTC1594L/LTC1598L provide separate MUX output and ADC input pins to form an ideal MUXOUT/ADCIN loop which economizes signal conditioning. The MUX and ADC of the devices can also be controlled individually through separate chip selects to enhance flexibility. SERIAL INTERFACE For this discussion, we will assume that CSMUX and CSADC are tied together and will refer to them as simply CS, unless otherwise specified. The LTC1594L/LTC1598L communicate with the micro- processor and other external circuitry via a synchronous, half duplex, 4-wire interface (see Operating Sequences in Figures 1 and 2). CLK EN D1 D2 CSMUX = CSADC = CS tCYC B5 B6 B7 B8 B9 B10 B11 Hi-Z DOUT CH0 TO CH7 DIN tCONV Hi-Z tsuCS NULL BIT D0 B4 B3 B2 B1 B0* tSMPL tON DON’T CARE ADCIN = MUXOUT COM = GND *AFTER COMPLETING THE DATA TRANSFER, IF FURTHER CLOCKS ARE APPLIED WITH CS LOW, THE ADC WILL OUTPUT LSB-FIRST DATA THEN FOLLOWED WITH ZEROS INDEFINITELY 1594F/98F F01 Figure 1. LTC1594L/LTC1598L Operating Sequence Example: CH2, GND |
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