PDF HS7541AJS Data sheet ( Hoja de datos )

Número de pieza	HS7541AJS
Descripción	12-Bit CMOS Multiplying DAC
Fabricantes	Sipex Corporation
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No Preview Available ! ® HS7541A 12–Bit CMOS Multiplying DAC s ±0.5 LSB DNL and INL s High Stability, Segmented Architecture (3 MSB’s) s Proprietary, Low TCR Thin–Film Resistor Technology s Low Sensitivity to Output Amplifier Offset s 2KV ESD Protection on All Digital Inputs s Operates With +5V to +15V Power Supplies s AD7541/7541A Replacement s Low Cost DESCRIPTION… The HS7541A is a low–cost, high stability monolithic 12–bit CMOS 4–quadrant multiplying DAC. It is constructed using a proprietary low–TCR thin–film process that requires no laser–trimming to achieve 12–bit performance. The HS7541A is a superior pin–compatible replacement for the industry standard 7541 and AD7541A. It is available in both commercial and industrial temperature ranges. It operates with +5V to +15V power supply voltages. It is available in 18– pin plastic DIP and SOIC, and 20–pin PLCC packages. D11 (MSB) [4] D10 [5] D9 [6] D8 [7] D7 [8] D6 [9] D5 [10] D4 [11] D3 [12] D2 [13] D1 [14] D0 (LSB) [15] VREF [17] 20KΩ 20KΩ 10KΩ 20KΩ 10KΩ 20KΩ 10KΩ 20KΩ 10KΩ 20KΩ 10KΩ 20KΩ 10KΩ 20KΩ 10KΩ 20KΩ 10KΩ 20KΩ 10KΩ 20KΩ 10KΩ 20KΩ 10KΩ 20KΩ VDD [16] GND [3] 10KΩ IO2 [2] IO1 [1] RFB [18] HS7541A 12-Bit CMOS Multiplying DAC 1 © Copyright 2000 Sipex Corporation 1 page VREF 20KΩ 10KΩ 10KΩ 10KΩ 20KΩ 20KΩ 20KΩ S0 S1 S2 S11 20KΩ D11 (MSB) D1 D2 D0 (LSB) Switches shown for digital inputs "high" Figure 1. Simplified DAC Circuit IOUT2 IOUT1 RFB IREF R = 10KΩ VREF 1/4096 R = 10KΩ ILEAKAGE 85pF RFEEDBACK IOUT1 ILEAKAGE 30pF IOUT2 Figure 3. Equivalent Circuit – All Inputs High The twelve output current-steering switches are in series with the R-2R ladder, and therefore, can introduce bit errors. It is essential then, that the switch “on” resistance be binarily scaled so that the voltage drop across each switch remains constant. If, for example, switch S0 of Figure 1 was designed with an “on” resistance of 10 ohms, switch S1 for 20 ohms, etc., then with a 10V reference input, the current through S0 is 0.5mA, S1 is 0.25mA, etc.; a constant 5mV drop will then be maintained across each switch. To further insure accuracy across the full tem- perature range, permanently “on” MOS switches are included in series with the feedback resistor and the R-2R ladder’s terminating resistor. These series switches are equivalently scaled to two times switch S11 (MSB) and to switch S0 (LSB) respectively to maintain constant relative volt- age drops with varying temperature. During any testing of the resistor ladder or RFB (such as incoming inspection), VDD must be present to turn “on” these series switches. 2001V ESD Protection In the design of the HS7541A’s data inputs, 2001V ESD resistance has been incorporated through careful layout and the inclusion of input protection circuitry. Equivalent Circuit Analysis Figures 2 and 3 show the equivalent circuits for all digital inputs LOW and HIGH respectively. The reference current is switched to IOUT2 when all inputs are LOW, and to IOUT1 when all inputs are HIGH. The ILEAKAGE current source is the combination of surface and junction leakages to the substrate; the 1/4096 current source represents the constant 1-bit current drain through the ladder terminating resis- tor. The output capacitance is dependent upon the digital input code, and therefore varies between the low and high values. Output Impedance The output resistance, as in the case of the output capacitance, varies with the digital input code. The resistance, looking back into the IOUT1 ter- R = 10KΩ IREF R = 10KΩ VREF 1/4096 ILEAKAGE 30pF ILEAKAGE 85pF RFEEDBACK IOUT1 IOUT2 Figure 2. Equivalent Circuit – All Inputs Low GAIN TRIM +15V VREF (–10V) 2KΩ D11 (MSB) 17 4 VREF 16 VDD RFB 18 GAIN TRIM 1KΩ INPUT DATA IO1 1 HS7541A +15V 15pF – + D0 (LSB) 15 GND 3 IO2 2 –15V VOUT Figure 4. Unipolar Operation HS7541A 12-Bit CMOS Multiplying DAC 5 © Copyright 2000 Sipex Corporation 5 Page

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