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DAC8881 数据表(PDF) 26 Page - Texas Instruments |
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DAC8881 数据表(HTML) 26 Page - Texas Instruments |
26 / 34 page www.ti.com OUTPUT RANGE V V - REFH REFL 65536 ´ CODE BufferGain+V ´ REFL V OUT = (1) INPUT DATA FORMAT POWER DOWN HARDWARE RESET DAC8881 SBAS422A – JULY 2007 – REVISED SEPTEMBER 2007 The maximum output range of the DAC8881 is VREFL to VREFH × G, where G is the output buffer gain set by the GAIN pin. When the GAIN pin is connected to DGND, the output buffer gain = 1. When the GAIN pin is connected to IOVDD, the output buffer gain = 2. The output range must not be greater than AVDD; otherwise, output saturation occurs. The DAC8881 output transfer function is given in Equation 1: Where: CODE = 0 to 65535. This is the digital code loaded to the DAC. Buffer Gain = 1 or 2 (set by the GAIN pin). VREFH = reference high voltage applied to the device. VREFL = reference low voltage applied to the device. The USB/BTC pin defines the input data format. When this pin is connected to IOVDD, the input data format is straight binary, as shown in Table 1. When this pin is connected to DGND, the input data format is two's complement, as shown in Table 2. Table 1. Output vs Straight Binary Code USB CODE 5V RANGE DESCRIPTION FFFFh +4.99992 +Full-Scale – 1LSB C000h +3.75000 3/4-Scale 8000h +2.50000 Midscale 4000h +1.25000 1/4-Scale 0000h 0.00000 Zero-Scale Table 2. Output vs Two's Complement Code BTC CODE 5V RANGE DESCRIPTION 7FFFh +4.99992 +Full-Scale – 1LSB 4000h +3.75000 3/4-Scale 0000h +2.50000 Midscale FFFFh +2.49992 Midscale – 1LSB C000h +1.25000 1/4-Scale 8000h 0.00000 Zero-Scale The DAC8881 has a hardware power-down function. When the PDN pin is high, the device is in power-down mode. The VOUT pin is connected to ground through an internal 10kΩ resistor, but the contents of the input register and the DAC latch do not change. In power-down mode, SPI communication is still active. When the RST pin is low, the device is in hardware reset mode, and the input register and DAC latch are set to the value defined by the RSTSEL pin. After RST goes high, the device is in normal operating mode. 26 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): DAC8881 |
类似零件编号 - DAC8881 |
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类似说明 - DAC8881 |
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