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PBM3960-1

Ericsson

Microstepping Controller/Dual Digital-to-Analog Converter

February 1999 PBM 3960/1 Microstepping Controller/ Dual Digital-to-Analog Converter Description PBM 3960/1 is a dual 7-...


PBM3960-1

Ericsson


Octopart Stock #: O-35488

Findchips Stock #: 35488-F

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Description
February 1999 PBM 3960/1 Microstepping Controller/ Dual Digital-to-Analog Converter Description PBM 3960/1 is a dual 7-bit+sign, Digital-to-Analog Converter (DAC) especially developed to be used together with the PBL 3771/1, Precision Stepper Motor driver in micro-stepping applications. The circuit has a set of input registers connected to an 8-bi
More View t data port for easy interfacing directly to a microprocessor. Two registers are used to store the data for each seven-bit DAC, the eighth bit being a sign bit (sign/ magnitude coding). A second set of registers are used for automatic fast/slow current decay control in conjunction with the PBL 3771/1, a feature that greatly improves high-speed micro-stepping performance. The PBM 3960/1 is fabricated in a highspeed CMOS process. Key Features • Analog control voltages from 3 V down to 0.0 V. • High-speed microprocessor interface. • Automatic fast/slow current decay control. • Full-scale error ±1 LSB. • Interfaces directly with TTL levels and CMOS devices. • Fast conversion speed, 3 µs. • Matches PBL 3771. WR C DA- Data 1 D E1 CS C D R Level 2 R Level 1 Digit Comp E1 C E D R CD 1 DA 1 E E2 A0 E3 C D A1 E4 D7 - D0 C D R R DA- Data 2 D/A E D/A Digit Comp E4 C D R DA E 2 CD 2 E Sign 2 POR RESET R V ss Figure 1. Block Diagram. P B 22-pin plastic DIP 28-pin plastic PLCC M M B /1 P 60 39 E Sign 1 39 PBM 3960/1 60 /1 V DD V Ref PBM 3960/1 Maximum Ratings Parameter Pin no. * Symbol Min Max Unit Voltage Supply Logic inputs Reference input Current Logic inputs Temperature Storage temperature Operating ambient temperature * refers to DIP package 5 6- 17 1 6- 17 VDD VI VR II TS TJ -0.3 -0.3 -0.4 -55 -20 6 VDD+ 0.3 VDD+ 0.3 +0.4 +150 +85 V V V mA °C °C Recommended Operating Conditions Parameter Symbol Min Typ Max Unit Supply voltage Reference voltage VDD VR 4.75 0 5.0 2.5 5.25 3.0 V V t cs CS t as A0-A1 t ds D0-D7 t WR WR t ch t ah t dh t DAC DA t pwr Sign, CD Figure 2. Timing. t res Reset t pres Sign, CD Figure 3. Timing of Reset. 2 PBM 3960/1 Electrical Characteristics Electrical characteristics over recommended operating conditions. Parameter Ref. Symbol fig Conditions Min Typ Max Unit Logic Inputs Reset logic HIGH input voltage Reset logic LOW input voltage Logic HIGH input voltage Logic LOW input voltage Reset input current Input current, other inputs Input capacitance VIHR VILR VIH VIL IIR II 3.5 0.1 2.0 VSS < VIR < VDD VSS < VI < VDD -0.01 -1 3 2 2 2 2 2 2 2 3 Valid for A0, A1 Valid for D0 - D7 60 60 70 0 0 0 50 80 6 VO = 2.4 V VO = 0.4 V From positive edge of WR. outputs valid, Cload = 120 pF From positive edge of Reset to outputs valid, Cload = 120 pF Reset open, VRef = 2.5 V 9 -13 5 30 60 -5 100 150 0.8 1 1 V V V V mA µA pF ns ns ns ns ns ns ns ns kΩ mA mA ns ns Internal Timing Characteristics Address se






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