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DAC-HF8BMC Datasheet(PDF) 2 Page - Murata Power Solutions Inc. |
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DAC-HF8BMC Datasheet(HTML) 2 Page - Murata Power Solutions Inc. |
2 / 4 page DAC-HF Series ® ® DESCRIPTION 8B 10B 12B INPUTS Resolution, Bits 8 10 12 Coding, Unipolar Output Straight binary Coding, Bipolar Output Offset binary Input Logic Level, Bit ON ("1") +2.0V to +5.5V at +40μA Input Logic Level, Bit OFF ("0") 0V to +0.8V at –2.6mA PERFORMANCE Nonlinearity Error, max. ±0.012% TMIN to TMAX ±0.024% Differential Nonlinearity Error, max. ±0.012% TMIN to TMAX ±0.024% Monotonicity Guaranteed over oper. temp. range Gain Tempco, max. ±20ppm/°C Offset Tempco, Bipolar, max. ±10ppm/°C of FSR ➁ Zero Tempco, max. ±1.5ppm/°C of FSR ➁ Settling Time, ns max. ➂ 25 25 50 Power Supply Sensitivity ±0.01%/% Supply OUTPUTS Output Current Range, Unipolar 0 to +5mA Output Current Range, Bipolar ±2.5mA Output Compliance Voltage ±1.2V Output Voltage Ranges ➀ 0 to –5V 0 to –10V ±2.5V ±5V ±10V Output Resistance 400 Ohms ±10% Output Capacitance 15pF Output Leakage Current, All Bits OFF 15nA POWER REQUIREMENTS Supply Voltages ±15V ±0.5V Positive Quiescent Current, max. 40mA 45mA 50mA Negative Quiescent Current, max. 17mA 17mA 17mA PHYSICAL ENVIRONMENTAL Operating Temperature Range, Case 0°C to +70°C (BMC) –55°C to +125°C (BMM, 883) Storage Temperature Range –65°C to +150°C Package Type 24-pin ceramic DDIP Weight 0.22 ounces (6.3 grams) TECHNICAL NOTES 1. Proper operation of the DAC-HF Series converters is dependent on good board layout and connection practices. Bypass supplies as shown in the connection diagrams. Mount bypass capacitors close to the converter, directly to the supply pins where possible. 2. Use of a ground plane is particularly important in high- speed D/A converters as it reduces high-frequency noise and aids in decoupling the digital inputs from the analog output. Avoid ground loop problems by connecting all grounds on the board to the ground plane. The remainder of the ground plane should include as much of the circuit board as possible. 3. When the converter is configured for voltage output with an external operational amplifier, keep the leads from the converter to the output amplifier as short as possible. 4. The high-speed current switching technique used in the DAC-HF Series inherently reduces the amplitude and duration of large transient spikes at the output (“glitches”). The most severe glitches occur at half-scale, the major carry transition from 011 … 1 to 100 … 0 or vice versa. At this time, a skewing of the input codes can create a transition state code of 111 … 1. The duration of the “transition state code” is dependent on the degree of skewing, but its effect is dependent on the speed of the DAC (an ultra-fast DAC will respond to these brief spurious inputs to a greater degree than a slow DAC). Minimize the effects of input skewing by using a high- speed input register to match input switching times. The input register recommended for use with the DAC-HF is easily implemented with two Texas Instruments SN74S174 hex D-type flip-flops. This register will reduce glitches to a very low level and ensure fast output settling times. 5. Test the DAC-HF using a low-capacitance test probe (such as a 10X probe). Take care to assure the shortest possible connection between probe ground and circuit ground. Long probe ground leads may pick up environmental E.M.I. causing artifacts on the scope display, i.e., signals that do not originate at the unit under test. 6. Passive components used with the DAC-HF may be as indicated here: 0.1μF and 1μF bypass capacitors should be ceramic type and tantalum type respectively; the 400Ω output load is a ±0.1%, 10ppm/°C, metal-film type; adjustment potentiometers are ceremet types; other resistors may be ±10% carbon composition types. 7. Output voltage compliance is ±1.2V to preserve the linearity of the converter. In the bipolar mode, the DAC-HF can be operated with no load to give an output voltage of ±1.0V. In the unipolar mode, the load resistance must be less than 600Ω to give less than +1.2V output. The specified output currents of 0 to +5mA and ±2.5mA are measured into a short circuit or an operational amplifier summing junction. ABSOLUTE MAXIMUM RATINGS, ALL MODELS FUNCTIONAL SPECIFICATIONS (Typical at +25°C and ±15V supplies unless otherwise noted.) Positive Supply, Pin 24 +18V Negative Supply, Pin 22 –18V Digital Input Voltage, Pins 1–12 +15V Lead Temperature (soldering, 10s) 300°C Footnotes ➀ With external operational amplifier. ➁ FSR is Full Scale Range, or the difference between minimum and maximum output values. ➂ Full-scale current change to ±1LSB with 400Ω load. |
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