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MAX1239EEE Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX1239EEE Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 22 page Detailed Description The MAX1236–MAX1239 analog-to-digital converters (ADCs) use successive-approximation conversion tech- niques and fully differential input track/hold (T/H) cir- cuitry to capture and convert an analog signal to a serial 12-bit digital output. The MAX1236/MAX1237 are 4-channel ADCs, and the MAX1238/MAX1239 are 12- channel ADCs. These devices feature a high-speed, 2- wire serial interface supporting data rates up to 1.7MHz. Figure 2 shows the simplified internal structure for the MAX1238/MAX1239. Power Supply The MAX1236–MAX1239 operates from a single supply and consumes 670µA (typ) at sampling rates up to 94.4ksps. The MAX1237/MAX1239 feature a 2.048V internal reference and the MAX1236/MAX1238 feature a 4.096V internal reference. All devices can be config- ured for use with an external reference from 1V to VDD. Analog Input and Track/Hold The MAX1236–MAX1239 analog-input architecture con- tains an analog-input multiplexer (mux), a fully differen- tial track-and-hold (T/H) capacitor, T/H switches, a comparator, and a fully differential switched capacitive digital-to-analog converter (DAC) (Figure 4). In single-ended mode, the analog input multiplexer con- nects CT/H between the analog input selected by CS[3:0] (see the Configuration/Setup Bytes (Write Cycle) section) and GND (Table 3). In differential mode, the analog-input multiplexer connects CT/H to the “+” and “-” analog inputs selected by CS[3:0] (Table 4). During the acquisition interval, the T/H switches are in the track position and CT/H charges to the analog input 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs _______________________________________________________________________________________ 9 ANALOG INPUT MUX AIN1 AIN11/REF AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 AIN8 AIN9 AIN10 AIN0 SCL SDA INPUT SHIFT REGISTER SETUP REGISTER CONFIGURATION REGISTER CONTROL LOGIC REFERENCE 4.096V (MAX1238) 2.048V (MAX1239) INTERNAL OSCILLATOR OUTPUT SHIFT REGISTER AND RAM REF T/H 12-BIT ADC VDD GND MAX1238 MAX1239 Figure 2. MAX1238/MAX1239 Simplified Functional Diagram VDD IOL IOH VOUT 400pF SDA Figure 3. Load Circuit |
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