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TC1322EUA Datasheet(PDF) 6 Page - Microchip Technology |
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TC1322EUA Datasheet(HTML) 6 Page - Microchip Technology |
6 / 16 page TC1322 DS21388C-page 6 © 2005 Microchip Technology Inc. 3.0 DETAILED DESCRIPTION The TC1322 is a monolithic 10-bit digital-to-analog converter that is designed to operate from a single sup- ply that can range from 2.7V to 5.5V. The DAC consists of a data register (DATA), a configuration register (CONFIG), and a current output amplifier. The TC1322 uses an external reference, which also determines the maximum output voltage. The TC1322 uses a current steering DAC based on an array of matched current sources. This current, along with a precision resistor, converts the contents of the Data register and VREF into an output voltage, VOUT given by: VOUT = VREF (DATA/4096) 3.1 Reference Input The reference pin, VREF, is a buffered high-impedance input and because of this, the load regulation of the ref- erence source needs only to be able to tolerate leakage levels of current (less than 1 μA). VREF accepts a volt- age range from 0 to (VDD – 1.2V). Input capacitance is typically 10pF. 3.2 Output Amplifier The TC1322 DAC output is buffered with an internal unity gain rail-to-rail input/output amplifier with a typical slew rate of 0.8V/ μsec. Maximum full scale transition settling time is 10 μsec to within ±1/2LSB when loaded with 1k Ω in parallel with 100pF. 3.3 Standby Mode The TC1322 allows the host to put it into a Low Power (IDD = 0.5μA, typical) Standby mode. In this mode, the D/A conversion is halted. The SMBus port operates normally. Standby mode is enabled by setting the SHDN bit in the CONFIG register. The table below summarizes this operation. TABLE 3-1: STANDBY MODE OPERATION 3.4 SMBus Slave Address The TC1322 is internally programmed to have a default SMBus address value of 1001 000b . Seven other addresses are available by custom order (contact fac- tory). See Figure 3-1 for location of address bits in SMBus protocol. SHDN Bit Operating Mode 0 Normal 1 Standby |
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