Datasheet LTC1594L, LTC1598L (Analog Devices) - 10
| Hersteller | Analog Devices |
| Beschreibung | 4- and 8-Channel, 3V Micropower Sampling 12-Bit Serial I/O A/D Converters |
| Seiten / Seite | 24 / 10 — APPLICATIONS INFORMATION. OVERVIEW. SERIAL INTERFACE. Figure 1. … |
| Dateiformat / Größe | PDF / 370 Kb |
| Dokumentensprache | Englisch |
APPLICATIONS INFORMATION. OVERVIEW. SERIAL INTERFACE. Figure 1. LTC1594L/LTC1598L Operating Sequence Example: CH2, GND
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LTC1594L/LTC1598L
U U W U APPLICATIONS INFORMATION OVERVIEW
and can operate with reduced spans to 1.5V. Reducing the spans allow them to achieve 366µV resolution. The LTC1594L/LTC1598L are 3V micropower, 12-bit sampling A/D converters that feature 4- and 8-channel The LTC1594L/LTC1598L provide separate MUX output multiplexers respectively. They typically draw only 160µA and ADC input pins to form an ideal MUXOUT/ADCIN of supply current when sampling at 10.5kHz. Supply loop which economizes signal conditioning. The MUX current drops linearly as the sample rate is reduced (see and ADC of the devices can also be controlled individually Supply Current vs Sample Rate). The ADCs automatically through separate chip selects to enhance flexibility. power down when not performing conversions, drawing only leakage current. The LTC1594L is available in a
SERIAL INTERFACE
16-pin narrow SO package and the LTC1598L is pack- aged in a 24-pin SSOP. Both devices operate on a single For this discussion, we will assume that CSMUX and supply from 2.7V to 3.6V. CSADC are tied together and will refer to them as simply CS, unless otherwise specified. The LTC1594L/LTC1598L contain a 12-bit, switched- capacitor ADC, sample-and-hold, serial port and an The LTC1594L/LTC1598L communicate with the micro- external reference input pin. In addition, the LTC1594L processor and other external circuitry via a synchronous, has a 4-channel multiplexer and the LTC1598L provides half duplex, 4-wire interface (see Operating Sequences in an 8-channel multiplexer (see Block Diagram). They can Figures 1 and 2). measure signals floating on a DC common mode voltage tCYC CSMUX = CSADC = CS tsuCS CLK EN D1 DIN DON’T CARE D2 D0 NULL Hi-Z Hi-Z D BIT OUT B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0* tSMPL tCONV CH0 TO CH7 tON 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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U U W U APPLICATIONS INFORMATION OVERVIEW
and can operate with reduced spans to 1.5V. Reducing the spans allow them to achieve 366µV resolution. The LTC1594L/LTC1598L are 3V micropower, 12-bit sampling A/D converters that feature 4- and 8-channel The LTC1594L/LTC1598L provide separate MUX output multiplexers respectively. They typically draw only 160µA and ADC input pins to form an ideal MUXOUT/ADCIN of supply current when sampling at 10.5kHz. Supply loop which economizes signal conditioning. The MUX current drops linearly as the sample rate is reduced (see and ADC of the devices can also be controlled individually Supply Current vs Sample Rate). The ADCs automatically through separate chip selects to enhance flexibility. power down when not performing conversions, drawing only leakage current. The LTC1594L is available in a
SERIAL INTERFACE
16-pin narrow SO package and the LTC1598L is pack- aged in a 24-pin SSOP. Both devices operate on a single For this discussion, we will assume that CSMUX and supply from 2.7V to 3.6V. CSADC are tied together and will refer to them as simply CS, unless otherwise specified. The LTC1594L/LTC1598L contain a 12-bit, switched- capacitor ADC, sample-and-hold, serial port and an The LTC1594L/LTC1598L communicate with the micro- external reference input pin. In addition, the LTC1594L processor and other external circuitry via a synchronous, has a 4-channel multiplexer and the LTC1598L provides half duplex, 4-wire interface (see Operating Sequences in an 8-channel multiplexer (see Block Diagram). They can Figures 1 and 2). measure signals floating on a DC common mode voltage tCYC CSMUX = CSADC = CS tsuCS CLK EN D1 DIN DON’T CARE D2 D0 NULL Hi-Z Hi-Z D BIT OUT B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0* tSMPL tCONV CH0 TO CH7 tON 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
15948lfb 10