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DAC-HF8BMC Scheda tecnica(PDF) 1 Page - Murata Power Solutions Inc. |
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DAC-HF8BMC Scheda tecnica(HTML) 1 Page - Murata Power Solutions Inc. |
1 / 4 page PIN FUNCTION PIN FUNCTION 1 BIT 1 (MSB) 24 +15V SUPPLY 2 BIT 2 23 GROUND 3 BIT 3 22 –15V SUPPLY 4 BIT 4 21 REFERENCEOUT 5 BIT 5 20 BIPOLAR OFFSET 6 BIT 6 19 10V RANGE 7 BIT 7 18 OUTPUT 8 BIT 8 17 20V RANGE 9 BIT 9 * 16 REFERENCEIN 10 BIT 10 * 15 GROUND 11 BIT 11 * 14 GROUND 12 BIT 12 (LSB) * 13 GROUND INNOVATION and EXCELLENCE ® ® FEATURES ••••• 8, 10 and 12-Bit resolutions ••••• Settling times to 25ns ••••• ±20ppm/°C max. gain tempco ••••• Unipolar or bipolar operation ••••• Current output ••••• Internal feedback resistors ••••• High-reliability MIL-STD-883 models DAC-HF Series Ultra-Fast, 8/10/12-Bit Digital-to-Analog Converters Figure 1. Functional Block Diagram * See note in Figure 1 INPUT/OUTPUT CONNECTIONS, DAC-HF12B GENERAL DESCRIPTION The DAC-HF Series of hybrid DAC’s are ultra high-speed, current output devices. They incorporate state-of-the-art performance in a miniature package, achieving maximum output settling times of 25ns for the 8 and 10-bit models and 50ns for the 12-bit model. They can be used to drive a resistor load directly for up to ±1V output or a fast operational ampifier (such as DATEL’s AM-500) for higher voltage outputs with sub-microsecond settling times. A tapped feedback resistor and a bipolar offset resistor are included internally to give five programmable output voltage ranges with an external operational amplifier. The DAC-HF design combines proven hybrid construction techniques with advanced circuit design to realize high-speed current switching. The design incorporates fast PNP current switches driving a low-impedance R-2R thin-film ladder network. The nichrome thin-film resistor network is deposited by electron beam evaporation on a low- capacitance substrate to assure high-speed performance. The resistors are then functionally trimmed by laser for optimum linearity. REFERENCE CONTROL CIRCUIT 23 –15V SUPPLY 22 +15V SUPPLY 24 15 14 13 GROUNDS 16 2k W 2k W 4k W 18 19 17 20 BIPOLAR OFFSET BIT 12 * 11 * 10 * 9 * 8 7 6 5 4 3 2 1 MSB FAST PNP CURRENT SWITCHES FOR DAC-HF10B, PINS 11 & 12 ARE NO CONNECTION FOR DAC-HF8B, PINS 9, 10, 11 & 12 ARE NO CONNECTION * 21 REFERENCE OUT (–10.05V±0.05V) –10V REFERENCE THIN-FILM R-2R LADDER NETWORK DIGITAL INPUTS LSB PIN 20V RANGE 10V RANGE OUTPUT REFERENCE IN 12 11 10 9 8 7 6 5 4 3 2 1 |
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