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CDB5512 Datasheet(PDF) 4 Page - Cirrus Logic |
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CDB5512 Datasheet(HTML) 4 Page - Cirrus Logic |
4 / 22 page CDB5510/11/12/13 4 DS337DB2 ically 5ppm/°C). By setting HDR3’s jumper to the “REF” position, the user can supply an external voltage reference to J1’s REF input. V- is also pro- vided at connector J1 to allow an easy connection to the negative supply. (Application Note 4 on Cir- rus Logic’s web site details various voltage refer- ences). 1.5 Clocking Options The CS5510/11/12/13 are very simple ADCs, in- tended to continuously convert and output data when not in sleep mode. The CS5510 and CS5512 require an external clock signal on the SCLK input pin to run properly. The CDB5510 evaluation board provides three options for this clock source: 1) The microcontroller can be used to generate a clock for the CS5510/12. The microcontroller’s clock can be selected by removing the jumper from HDR7 on the CDB5510 board, and selecting the “CS5510/12 Clock from microcontroller” option in the software. The DIP switches on the evaluation board should be set as shown in the “CS5510/12 Clock from 8515” section of Table 3. The clock frequency can be selected by changing the “Oscil- lator Frequency” box in the software. Note that the frequency options are limited by the microcontrol- ler’s counter/timer circuitry, which divides the 3.6864 MHz clock by integer values to produce the clock output. 2) The 32 kHz on-board oscillator circuit (shown in Figure 11) can be used by connecting HDR7 on the CDB5510 board and selecting the “On-board or ex- ternal clock source” option in the software. The DIP switches on the evaluation board should be set as shown in the “CS5510/12 External Clock” sec- tion of Table 3. 3) An external clock can be provided by the user, and connected to the SCLK post on HDR7. The “On-board or external clock source” option in the software should be selected when using an external clock source, and the DIP switches on the evalua- tion board should be set as shown in the “CS5510/12 External Clock” section of Table 3. The CS5511 and CS5513 include an internal oscil- lator, and as such, need no external oscillator to run. When using the CS5511 or CS5513, HDR7 on the CDB5510 board should be left disconnected, and the “CS5511/13 Internally Clocked” option should be selected in the software. Likewise, the Reference Description HDR3 V+ Selects Analog Power Supply LT1019 Selects on board LT1019 Reference (5ppm/ °C) EXTERNAL Selects external reference source connected to J1 Table 2. Voltage Reference Selection Using HDR3 OO VREF OO VREF OO VREF V+ LT1019 REF OO VREF OO VREF OO VREF V+ LT1019 REF OO VREF OO VREF OO VREF V+ LT1019 REF Eval Board Mode SW1 Settings CS5511/13 Internally Clocked Xis OPEN Ais OPEN Bis OPEN CS5510/12 Clock From 8515 Xis OPEN Ais CLOSED Bis CLOSED CS5510/12 External Clock Xis OPEN Ais OPEN Bis CLOSED RS-232 Test Mode Xis CLOSED Ais CLOSED Bis CLOSED 1 23 OPEN XA B 1 23 OPEN XA B 1 23 OPEN XA B 1 23 OPEN XA B Table 3. DIP Switch Settings |
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