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ML144111CP Arkusz danych(PDF) 6 Page - LANSDALE Semiconductor Inc. |
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ML144111CP Arkusz danych(HTML) 6 Page - LANSDALE Semiconductor Inc. |
6 / 8 page www.lansdale.com Page 6 of 8 LANSDALE Semiconductor, Inc. ML144110, ML144111 PIN DESCRIPTIONS INPUTS Din Data Input Six–bit words are entered serially, MSB first, into digital data input, Din. Six words are loaded into the ML144110 dur- ing each D/A cycle; four words are loaded into the ML144111. The last 6–bit word shifted in determines the output level of pins Q1 Out and R1 Out. The next–to–last 6–bit word affects pins Q2 Out and R2 Out, etc. ENB Negative Logic Enable The ENB pin must be low (active) during the serial load. On the low–to–high transition of ENB, data contained in the shift register is loaded into the latch. CLK Shift Register Clock Data is shifted into the register on the high–to–low transi- tion of CLK. CLK is fed into the D–input of a transparent latch, which is used for inhibiting the clocking of the shift reg- ister when ENB is high. The number of clock cycles required for the ML144110 is usually 36. The ML144111 usually uses 24 cycles. SeeTable 1 for additional information. OUTPUTS Dout Data Output The digital data output is primarily used for cascading the DACs and may be fed into Din of the next stage. R1 Out through Rn Out Resistor Network Outputs These are the R–2R resistor network outputs. These outputs may be fed to high–impedance input FET op amps to bypass the on–chip bipolar transistors. The R value of the resistor net- work ranges from 7 to 15 k Ω. Q1 Out through Qn Out NPN Transistor Outputs Buffered DAC outputs utilize an emitter–follower configu- ration for current–gain, thereby allowing interface to low–im- pedance circuits. SUPPLY PINS VSS Negative Supply Voltage This pin is usually ground. VDD Positive Supply Voltage The voltage applied to this pin is used to scale the analog output swing from 4.5 to 15 V p–p. Table 1. Number of Channels vs Clocks Required Number of Channels Required Number of Clock Cycles Outputs Used on ML144110 Outputs Used on ML144111 1 6 Q1/R1 Q1/R1 2 12 Q1/R1, Q2/R2 Q1/R1, Q2/R2 3 18 Q1/R1, Q2/R2, Q3/R3 Q1/R1, Q2/R2, Q3/R3 4 24 Q1/R1, Q2/R2, Q3/R3, Q4/R4 Q1/R1, Q2/R2, Q3/R3, Q4/R4 5 30 Q1/R1, Q2/R2, Q3/R3, Q4/R4, Q5/R5 Not Applicable 6 36 Q1/R1, Q2/R2, Q3/R3, Q4/R4, Q5/R5, Q6/R6 Not Applicable Issue A |
Podobny numer części - ML144111CP |
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Podobny opis - ML144111CP |
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