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AS1501-TZ Datasheet(PDF) 5 Page - ams AG |
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AS1501-TZ Datasheet(HTML) 5 Page - ams AG |
5 / 8 page Data Sheet AS1500/1/2/3 Revision 1.0, Oct 2004 Page 5 of 8 AS150x – SPECIFICATIONS (VDD = 3V±10% or 5V±10%, VA = VDD, VB = 0V, –40°C ≤TA≤+125°C unless otherwise noted.) ELECTRICAL CHARACTERISTICS–ALL VERSIONS Parameter Sym- bol Conditions Min Typ 21 Max Unit SWITCHING CHARACTERISTICS 22, 23 Input Clock Pulsewidth tCH, tCL Clock Level High or Low 50 ns Data Setup Time tDS 5ns Data Hold Time tDH 5ns CSN Setup Time tCSS 10 ns CSN High Pulsewidth tCSW 10 ns CK Fall to CSN Rise Hold Time tCSH 0ns CSN Rise to Clock Rise Setup tCS1 10 ns Table 5: Switching Characteristics Detailed Description Serial-Programming Programming of the AS150x is done via the 3 wire serial interface. The three input signals are serial data input (SDI), clock(CK) and chip select (CS). A programming sequence consists of 10-bit, where the last eight bit contain the code word for the resistor value. The first two bits A1 and A0 have to be low(see Table ). The data is shifted into the internal 10 Bit register with the rising edge of the CK signal. With the rising edge of the CSN signal the data becomes valid and the resistance is updated (see figure 2). A detailed block diagram is shown in figure 3. A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 0 0 MSB Data LSB Table 6: Serial data format (16 bits) 21 Typicals represent average readings at 25°C and VDD=5V. 22 Guaranteed by design and not subject to production test. Resistor-terminal capacitance tests are measured with 2.5V bias on the measured terminal. The remaining resistor terminals are left open circuit. 23 See timing diagram for location of measured values. All input control voltages are specified with tR = tF = 1ns (10% to 90% of VDD) and timed from a voltage level of 1.6V. Switching characteristics are measured using VDD=3V or 5V. To avoid false clocking, a minimum input logic slew rate of 1V/µs should be maintained. Figure 2: Timing Diagram Figure 3: Detailed Timing Diagram Rheostat Operation The digital potentiometer family AS150x offers nominal resistor values of 10k Ω, 20 kΩ, 50kΩ and 100kΩ. The resistor has 256 contact points where the wiper can access the resistor. The 8-bit code word determines the position of the wiper and is decoded through an internal logic. The lowest code 00h is related to the terminal B. The resistance is then only determined by the wiper resistance (100 Ω). The resistance for the next code 01h is the nominal resistor RAB (10k Ω, 20 kΩ, 50kΩ or 100kΩ) divided through 256 plus the wiper resistor. In case of AS1501 (10k Ω) the total resistance is 39Ω+100Ω=139Ω. Accordingly the resistor for code 02h is 78 Ω+100Ω=178Ω. The last code 255h does not connect to terminal A directly (see Figure 5). So the maximum value is 10000 Ω - 39Ω +100 Ω = 10061Ω. The general formula for the calculation of the resistance RWB is: RWB (Dx)= (Dx)/256 ⋅RAB + RW where RAB is the nominal resistance between terminal A and B, RW is the wiper resistance and DX is the 8-Bit Code word. In Table 7 the resistor values between the wiper and terminal B for AS1501 are given for specific codes DX. In the zero-scale condition the wiper resistance of 100 Ω remains present. 1 1 1 0 0 0 0V VOUT CS CK SD VD DAC Register A1 A0 D7D6D5 D4 D3D2D1 D0 SDI VOUT CK CSN VDD 0 0 0 0V 1 1 1 ±1% Error ±1% AX or AX or tD tD tC tCS tCS tCS tCS tS tCL |
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