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DAC80-CBI-I Datasheet(PDF) 5 Page - Burr-Brown (TI) |
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DAC80-CBI-I Datasheet(HTML) 5 Page - Burr-Brown (TI) |
5 / 9 page 5 DAC80/80P ® DISCUSSION OF SPECIFICATIONS DIGITAL INPUT CODES The DAC80 accepts complementary binary digital input codes. The CBI model may be connected by the user for any one of three complementary codes: CSB, COB, or CTC (see Table I). ACCURACY Linearity of a D/A converter is the true measure of its performance. The linearity error of the DAC80 is specified over its entire temperature range. This means that the analog output will not vary by more than ±1/2LSB, maximum, from an ideal straight line drawn between the end points (inputs all “1”s and all “0”s) over the specified temperature range of 0 °C to +70°C. Differential linearity error of a D/A converter is the devia- tion from an ideal 1LSB voltage change from one adjacent output state to the next. A differential linearity error speci- fication of ±1/2LSB means that the output voltage step sizes can range from 1/2LSB to 3/2LSB when the input changes from one adjacent input state to the next. Monotonicity over a 0 °C to +70°C range is guaranteed in the DAC80 to insure that the analog output will increase or remain the same for increasing input digital codes. DRIFT Gain Drift is a measure of the change in the full scale range output over temperature expressed in parts per million per °C (ppm/°C). Gain drift is established by: 1) testing the end point differences for each DAC80 model at 0 °C, +25°C, and +70 °C; 2) calculating the gain error with respect to the 25°C value, and; 3) dividing by the temperature change. This figure is expressed in ppm/ °C and is given in the electrical specifications both with and without internal reference. Offset Drift is a measure of the actual change in output with all “1”s on the input over the specified temperature range. The offset is measured at 0 °C, +25°C, and 70°C. The maximum change in Offset is referenced to the Offset at 25 °C and is divided by the temperature range. This drift is expressed in parts per million of full scale range per °C (ppm of FSR/ °C). SETTLING TIME Settling time for each DAC80 model is the total time (including slew time) required for the output to settle within an error band around its final value after a change in input (see Figure 1). Voltage Output Models Three settling times are specified to ±0.01% of full scale range (FSR); two for maximum full scale range changes of 20V, 10V and one for a 1LSB change. The 1LSB change is measured at the major carry (0111...11 to 1000...00), the point at which the worst case settling time occurs. Current Output Models Two settling times are specified to ±0.01% of FSR. Each is given for current models connected with two different resis- tive loads: 10 Ω to 100Ω and 1000Ω to 1875Ω. Internal resistors are provided for connecting nominal load resis- tances of approximately 1000 Ω to 1800Ω for output voltage range of ±1V and 0 to –2V (see Figures 11 and 12). COMPLIANCE Compliance voltage is the maximum voltage swing allowed on the current output node in order to maintain specified accuracy. The maximum compliance voltage of all current output models is ±2.5V. Maximum safe voltage range of ±1V and 0 to –2V (see Figures 11 and 12). POWER SUPPLY SENSITIVITY Power supply sensitivity is a measure of the effect of a power supply change on the D/A converter output. It is defined as a percent of FSR per percent of change in either the positive or negative supplies about the nominal power supply voltages (see Figure 2). REFERENCE SUPPLY All DAC80 models are supplied with an internal 6.3V reference voltage supply. This voltage (pin 24) has a toler- ance of ±1% and must be connected to the Reference Input DIGITAL INPUT ANALOG OUTPUT CSB COB CTC(1) Complementary Complementary Complementary Straight Offset Two’s MSB LSB Binary Binary Complement ↓↓ 000000000000 +Full Scale +Full Scale –1LSB 011111111111 +1/2 Full Scale Zero –Full Scale 100000000000 1/2 Full Scale –1LSB –1LSB –Full Scale 111111111111 Zero –Full Scale Zero NOTE: (1) Invert the MSB of the COB code with an external inverter to obtain CTC code. TABLE I. Digital Input Codes. FIGURE 1. Full Scale Range Settling Time vs Accuracy. 0.1 Settling Time (µs) 1 10 100 1 0.3 0.1 0.03 0.01 0.003 0.001 R L= 10 Ω to 100 Ω R L= 1000 Ω to 1875 Ω 10k Ω Feedback 5k Ω Feedback V Models I Models |
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