DAC8512 Analog Devices, DAC8512 Datasheet
DAC8512
Specifications of DAC8512
Available stocks
Related parts for DAC8512
DAC8512 Summary of contents
Page 1
... CBCMOS process, these monolithic DACs offer the user low cost, and ease of use only systems. Coding for the DAC8512 is natural binary with the MSB loaded first. The output op amp can swing to either rail and is set to a range +4.095 V—for a one-millivolt-per-bit resolution. ...
Page 2
... DAC8512–SPECIFICATIONS ELECTRICAL CHARACTERISTICS Parameter Symbol STATIC PERFORMANCE Resolution N Relative Accuracy INL Differential Nonlinearity DNL Zero-Scale Error V ZSE Full-Scale Voltage V FS Full-Scale Tempco TCV ANALOG OUTPUT Output Current I OUT Load Regulation at Full Scale L REG Capacitive Load C L LOGIC INPUTS Logic Input Low Voltage ...
Page 3
... Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. Model DAC8512EP DAC8512FP DAC8512FS DAC8512GBC REV +25 C, applies to part number DAC8512GBC only, unless otherwise noted) A Condition No Missing Codes Data = 000 ZSE H Data = FFF FS ...
Page 4
... DAC8512 D11 D10 SDI CLK t css CS t ld1 LD SDI CLK LD CLR FS V OUT CLK CLR LD Serial Shift Register Function Effect Effect Effect Shift-Register-Data Advanced One Bit + Shift-Register-Data Advanced One Bit – ...
Page 5
... NUMBER OF TRANSISTORS : 642 DIE SIZE: 0.055 inch 0.106 inch; 5830 sq mils REV. A OPERATION The DAC8512 is a complete ready to use 12-bit digital-to-analog converter. It contains a voltage-switched, 12-bit, laser-trimmed DAC, a curvature-corrected bandgap reference, a rail-to-rail output op amp, a DAC register, and a serial data input register. 8 ...
Page 6
... V voltage levels. The graph in Figure 9 shows the effect on to- OL tal DAC8512 supply current as a function of the actual value of input logic voltage. Consequently use of CMOS logic vs. TTL minimizes power dissipation in the static state the SDI, CS and CLR pins provides the lowest standby power dissipation of 2 ...
Page 7
... 4.6 PROPER OPERATION 4.4 WHEN V SUPPLY DD VOLTAGE ABOVE CURVE 4.2 4.0 0.01 0.04 0.1 0.4 1.0 4.0 OUTPUT LOAD CURRENT – mA Figure 11. Minimum Supply Voltage vs. Load REV. A Typical Performance Characteristics — DAC8512 100 V = +5V DD DATA = 000 + + 0 – 0. 100 OUTPUT SINK CURRENT – A Figure 6 ...
Page 8
... DAC8512 — Typical Performance Characteristics + + LOAD L TIME – 10 s/DIV Figure 14. Rise Time Detail 60 TUE = INL + 300 UNITS + –12 –8 – +12 TOTAL UNADJUSTED ERROR – mV Figure 17. Total Unadjusted Error ...
Page 9
... POWER SUPPLY Figure 23. Properly Filtering Logic Supply Can Yield a High Quality Analog Supply In order to fit the DAC8512 in an 8-pin package, it was neces- sary to use only one ground connection to the device. The ground connection of the DAC serves as the return path for supply currents as well as the reference point for the digital in- put thresholds ...
Page 10
... V supply, a single +5 V supply may not be available in many applications. Since the DAC8512 consumes no more than 2.5 mA, maximum, then an integrated voltage reference, such as the REF02, can be used as the DAC8512 +5 V supply. The configuration of the circuit is shown in Figure 26. Notice that the reference’s output voltage requires no trimming because of the REF02’ ...
Page 11
... R1 R1 510k Figure 30. Generating a –5 V Supply When Only + + Available A High-Compliance, Digitally Controlled Precision Current Source +5V The circuit in Figure 31 shows the DAC8512 controlling a 8 high-compliance precision current source using an AMP05 in strumentation amplifier. The AMP05’s reference pin becomes the input, and the “ ...
Page 12
... Figure 31. A High-Compliance, Digitally Controlled Precision Current Source A Single-Supply, Programmable Current Source The circuit in Figure 32 shows how the DAC8512 can be used with an OP295 single-supply, rail-to-rail output op amp to pro- vide a digitally programmable current sink from V consumes less than 3.8 mA, maximum. The DAC’s output volt- ...
Page 13
... Illustrated in Figure opto-isolated interface using the DAC8512. In this circuit, the CS line is always LOW to enable the DAC, and the combination connected to the DAC’s CLR pin sets a turn-on time constant reset the DAC upon application of power ...
Page 14
... SCLK and one for SDI. The 74HC161 counter in incremented on every rising edge of the clock. Additionally, the data is loaded into the DAC8512 on the falling edge of the clock by inverting the serial clock using gate “Y.” The timing diagram shows that after the twelfth bit has been clocked the output of the counter is binary 1011 ...
Page 15
... This was achieved by setting C1LO and C2LO to +625 mV using R1 and R2. Next, the output of the DAC8512 was scaled so that the gain of the AD600 equaled 20 dB when the digital input code equaled 800 ...
Page 16
... DAC8512 A Serial DAC, Audio Volume Control The DAC8512 is well suited to control digitally the gain or at- tenuation of a voltage controlled amplifier. In professional audio mixing consoles, music synthesizers, and other audio processors, VCAs, such as the SSM2018, adjust audio channel gain and at- tenuation from front panel potentiometers. The VCA provides a ...
Page 17
... To load data to the DAC8512’s input serial register, PC0 is left low after the first eight bits are transferred, and a second byte of data is then transferred serially to the DAC8512 ...
Page 18
... CLR/ and CS/ are now enabled as outputs 0,0,1,1;0,0,0,0 LDI-Hi,SCLK-Hi,SDI-Lo Initialize Port D Outputs 0,0,1,1;1,0,0,0 LD/,SCLK, and SDI are now enabled as outputs SPI is Master,CPHA=1,CPOL=1,Clk rate=E/32 Xfer 2 8-bit words to DAC8512 Restart BUFFALO Save registers X, Y, and A 0,0,0,0;1,0,1,0 SDI1 is set to 0A (Hex) 1,0,1,0;1,0,1,0 SDI2 is set to AA (Hex) ...
Page 19
... Loop to wait for SPIF WAIT SPIF is the MSB of SPSR (when SPIF is set, SPSR is negated) Increment counter to next byte for xfer #SDI2+1 Are we done yet ? TFRLP If not, xfer the second byte PORTD,Y $20 Assert LD/ PORTD,Y $20 Latch DAC register PORTC,Y $01 De-assert CS/ ** Return to Main Program ** –19– DAC8512 ...
Page 20
... DAC8512 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Pin Plastic DIP (P Suffix 0.280 (7.11) 0.240 (6.10 0.070 (1.77) 0.045 (1.15) 0.430 (10.92) 0.325 (8.25) 0.348 (8.84) 0.300 (7.62) 0.015 0.210 (0.381) TYP (5.33) MAX 0.130 0.015 (0.381) 0.160 (4.06) (3.30) 0.008 (0.204) 0.115 (2.93) MIN SEATING 0.022 (0.558) 0.100 PLANE 0.014 (0.356) (2 ...