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MAX1179AEUI Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX1179AEUI Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 15 page completing a conversion. The reference and reference buffer require a minimum of 12ms (CREFADJ = 0.1µF, CREF = 10µF) to power up and settle from shutdown. The state of R/C during the second falling edge of CS selects which power-down mode the MAX1179/ MAX1187/MAX1189 enters upon conversion comple- tion. Holding R/C low causes the MAX1179/MAX1187/ MAX1189 to enter standby mode. The reference and buffer are left on after the conversion completes. R/C high causes the MAX1179/MAX1187/MAX1189 to enter shutdown mode and power down the reference and buffer after conversion (see Figures 5 and 6). Set the voltage at REF high during the second falling edge of CS to realize the lowest current operation. Standby Mode While in standby mode, the supply current is less than 3.7mA (typ). The next falling edge of CS with R/C low causes the MAX1179/MAX1187/MAX1189 to exit stand- by mode and begin acquisition. The reference and ref- erence buffer remain active to allow quick turn-on time. 16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range _______________________________________________________________________________________ 9 Figure 4. Equivalent Input Circuit MAX1187 R2 R3 161 Ω 3.4k Ω TRACK TRACK HOLD HOLD S1, S2 = T/H SWITCH S3 = POWER-DOWN (MAX1179/MAX1189 ONLY) S1 CHOLD 30pF S2 AIN MAX1179/MAX1189 R2 R3 161 Ω 3.4k Ω S3 POWER- DOWN TRACK TRACK HOLD HOLD REF R2 = 7.85k Ω (MAX1189) OR 3.92k Ω (MAX1179/MAX1187) R3 = 5.45k Ω (MAX1189) OR 17.79k Ω (MAX1179/MAX1187) S1 CHOLD 30pF S2 AIN T/H OUT T/H OUT Figure 5. Selecting Standby Mode CS R/C EOC ACQUISITION CONVERSION DATA OUT REF AND BUFFER POWER |
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