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MAX1110 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX1110 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 20 page +2.7V, Low-Power, Multichannel, Serial 8-Bit ADCs 10 ______________________________________________________________________________________ Table 3. Control-Byte Format START SEL2 SEL1 SEL0 UNI/BIP SGL/DIF PD1 PD0 BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 (MSB) (LSB) NAME SGL/DIF 2 BIT 1 = single ended, 0 = differential. Selects single-ended or differential conversions. In single- ended mode, input signal voltages are referred to COM. In differential mode, the voltage differ- ence between two channels is measured (Tables 1 and 2). DESCRIPTION UNI/BIP 3 START 1 = unipolar, 0 = bipolar. Selects unipolar or bipolar conversion mode. Select differential operation if bipolar mode is used (Table 4). PD0 0 (LSB) 7 (MSB) 1 = external clock mode, 0 = internal clock mode. Selects external or internal clock mode. The first logic “1” bit after CS goes low defines the beginning of the control byte. SEL2 SEL1 SEL0 6 5 4 Select which of the input channels are to be used for the conversion (Tables 1 and 2). PD1 1 1 = fully operational, 0 = power-down. Selects fully operational or power-down mode. The time required for the T/H to acquire an input signal is a function of how quickly its input capacitance is charged. If the input signal’s source impedance is high, the acquisition time lengthens, and more time must be allowed between conversions. The acquisition time, tACQ, is the minimum time needed for the signal to be acquired. It is calculated by: tACQ = 6 x (RS + RIN) x 18pF where RIN = 6.5kΩ, RS = the source impedance of the input signal, and tACQ is never less than 1µs. Note that source impedances below 2.4kΩ do not significantly affect the AC performance of the ADC. Input Bandwidth The ADC’s input tracking circuitry has a 1.5MHz small- signal bandwidth, so it is possible to digitize high- speed transient events and measure periodic signals with bandwidths exceeding the ADC’s sampling rate by using undersampling techniques. To avoid high- frequency signals being aliased into the frequency band of interest, anti-alias filtering is recommended. Analog Inputs Internal protection diodes, which clamp the analog input to VDD and AGND, allow the channel input pins to swing from (AGND - 0.3V) to (VDD + 0.3V) without dam- age. However, for accurate conversions near full scale, the inputs must not exceed VDD by more than 50mV or be lower than AGND by 50mV. If the analog input exceeds 50mV beyond the sup- plies, do not forward bias the protection diodes of off channels over 2mA. The MAX1110/MAX1111 can be configured for differen- tial or single-ended inputs with bits 2 and 3 of the con- trol byte (Table 3). In single-ended mode, the analog inputs are internally referenced to COM with a full-scale input range from COM to VREFIN + COM. For bipolar operation, set COM to VREFIN/2. In differential mode, choosing unipolar mode sets the differential input range at 0V to VREFIN. In unipolar mode, the output code is invalid (code zero) when a negative differential input voltage is applied. Bipolar mode sets the differential input range to ±VREFIN/2. Note that in this mode, the common-mode input range includes both supply rails. Refer to Table 4 for input voltage ranges. Quick Look To quickly evaluate the MAX1110/MAX1111’s analog performance, use the circuit of Figure 5. The MAX1110/MAX1111 require a control byte to be written to DIN before each conversion. Tying DIN to +3V feeds |
Similar Part No. - MAX1110_11 |
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Similar Description - MAX1110_11 |
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