AL1213A 8-BIT 0.5MSPS DAC GENERAL DESCRIPTION The AL1213A is a CMOS 8-bit D/A converter for general application. This digital to analog converter consists of a R-2R ladder block & an Op amp block. Its maximum conversion rate is 0.5MSPS. FEATURES • Resolution : 8-bit • Differential Linearity Error : ± 0.4 LSB (TYP) • Maximum Conversion Rate : 0.5MSPS • Supply Voltage : 5V • External Voltage Reference • Single Voltage Output : 0V to 5V • Operation Temperature Range : 0 to 70°C TYPICAL APPLICATIONS • DVD • CDP • General purpose Digital to Analog Conversion FUNCTIONAL BLOCK DIAGRAM VRT D[7] D[6] D[5] D[4] D[3] R2R LADDER OP AMP VOUT D[2] D[1] D[0] VRB PD Rev 2.1 (Apr. 2002) No responsibility is assumed by SEC for its use nor for any infringements of patents or other rights of third parties that may result from its use. The content of this datasheet is subject to change without any notice. 1 8-BIT 0.5MSPS DAC AL1213A CORE PIN DESCRIPTION Name I/O Type I/O Pad DI0 ~ DI7 DI picc_bb Digital Input Data VRB AI pia_bb Voltage Reference Bottom (0V) VRT AI pia_bb Voltage Reference Top (5V) AOUT AO poa_bb Analog Voltage Output VDDA AP vdda Analog Power VSSA AG vssa Analog Ground VBB AG vbb Analog Ground I/O TYPE ABBR • AI : Analog Input • DI : Digital Input • AO : Analog Output • DO : Digital Output • AP : Analog Power • AG : Analog Ground • AB : Analog bi-direction port • DB : Digital Bidirection port • DP : Digital Power • DG : Digital Ground • DB : Digital Sub Bias 2 Pin Description AL1213A 8-BIT 0.5MSPS DAC CORE CONFIGURATION VDDA VSSA VBB D[7:0] al1213a VOUT PD VRT VRB ABSOLUTE MAXIMUM RATINGS Characteristics Supply Voltage Reference Input Voltage Digital Input Voltage Operating Temperature HIGH LOW Symbol Typ Unit VDDA 5 V VRT VRB 5.0 0.0 V V Vinh Vinl 5.0 0.0 V V Top 0 to 70 °C NOTES : 1. ABSOLUTE MAXIMUM RATING specifies the values beyond which the device may be damaged permanently. Exposure to ABSOLUTE MAXIMUM RATINGS conditions for extended periods may affect reliability. Each condition value is applied with the other values kept within the following operating conditions and function operation under any of these conditions not implied. 2. All voltages are measured with respect to VSSA, VDDD unless otherwise specified. 3 8-BIT 0.5MSPS DAC AL1213A RECOMMENDED OPERATING CONDITIONS Characteristics Symbol Min Typ Max Unit VDDA 4.75 5.0 5.25 V Reference Input Voltage VRT VRB - 5.0 0.0 - V V Digital Input Voltage Vinh Vinl 0.7 VDDD - - 0.3 VDDD V V Top 0 - 70 °C Supply Voltage HIGH LOW Operating Temperature NOTE: It is strongly recommended that to avoid power latch-up all the supply pins (VDDA, VDDD) be driven from the same source. DC ELECTRICAL CHARACTERISTICS (Converter Specifications : VDDA = 5V, VSSA = VBB = 0V, Top = 25°C, VRT = 5.0V, VRB = 0.0V Cload = 2pF unless otherwise specified.) Characteristics Symbol Min Typ Max Unit - - 8 - Bits Differential Linearity Error DLE - 0.4 ±1 LSB Integral Linearity Error ILE - 0.8 ±1 LSB Maximum Output Voltage - 4.75 5 5.25 V LSB Size - 19.0 19.5 20 mV Resolution 4 AL1213A 8-BIT 0.5MSPS DAC AC ELECTRICAL CHARACTERISTICS (Converter Specifications : VDDA = 5V, VSSA = VBB = 0V, Top = 25°C, VRT = 5.0V, VRB = 0.0V Cload = 2pF unless otherwise specified.) Characteristics Symbol Min Typ Max Unit Test Conditions fc - 0.5 - MSPS data = 0.5MHz Ivdd 1.5 2.3 7.0 mA fc = 0.5MHz (load cap = 25pF) Analog Output Delay Td - 190 270 ns fc = 0.5MHz Data : All High Analog Output Rise Time Tr - 230 300 ns fc = 0.5MHz Data : All Low → All High Analog Output Fall Time Tf - 230 300 ns fc = 0.5MHz Data : All High → All Low Center Code Rising Time Trd - 0.3 0.4 ms fc = 0.5MHz Data : 01111111 → 10000000 Power down on time Tpon - 30 - ns Data : 11111111 Power down off time Tpof - 240 - ns Data : 11111111 Power down current Ipd - 4 50 nA Data : 11111111 PD : 0V Conversion Rate Dynamic Supply Current 5 8-BIT 0.5MSPS DAC AL1213A TIMING DIAGRAM D[0]-D[7] DATA Td 90% 1LSB 50% Tr Tf 10% VOUT Ts D[0]-D[7] PD Tpof Tpon +/- 1/2LSB VOUT +/- 1/2LSB 1. Output delay measured from the 50% point of the rising edge of input data to the full scale transition. 2. Settling time measured from the 50% point of full scale transition to the output remaining within ± 1/2 LSB. 3. Output rise/fall time measured between the 10% and 90% points of full scale transition. FUNCTION DESCRIPTION 1. The AL1213A has a R-2R Ladder Block for 8bit and an Opamp Block for driving Output. 1 2 3 n 2. The R-2R Ladder Block generates binary weighted voltage (VRT/2 VRT/2 VRT/2 . . . VRT/2 ) corresponding to Digital Input Data for n-bit DAC and Output total voltage is summing of each values. 3. In Output voltage, MSB = VRT/21 LSB = VRT/2n 4. Output of the R2R Ladder Block is driven by Opamp 6 AL1213A 8-BIT 0.5MSPS DAC CORE EVALUATION GUIDE 5V Cc Ct VDDA VSSA VBB MAIN PATH D[7:0] al1213a VRT Ct VRB Ct Cc Cc SELECT VOUT 5V 0V TEST PATH Location Description Ct 10mF TANTALUM CAPACITOR Cc 0.1mF CERAMIC CAPACITOR 7 8-BIT 0.5MSPS DAC AL1213A TESTABILITY Whether you use MUX or the internal logic for testability, it is required to be able to select the values of digital inputs (D[0] ~ D[7]). See above figure. Only if it is, you can check the main function (Linearity) VOUT VDDA VBB VSSA PD PHANTOM CELL INFORMATION D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] VRT VRB AL1213A Pin Name Property Pin Usage Pin Layout Guide D[7:0] DI Internal / External 1. Digital Input Signal lines must have same length to PD DI Internal / External reduce propagation delay. VRT AB Internal / External 1. Voltage reference lines (VRT / VRB) must be wide metal to reduce voltage drop of metal lines VRB AB Internal / External 2. VOUT signal should not be crossed by any signals and should not run next to digital signals to minimize capacitive VOUT AO Internal / External coupling between the two signals. VDDA AP External 1. It is recommended that you use thick analog power metal. VSSA AG External When connected to PAD, the path should be kept as short VBB AG External as possible. 1. When the core block is connected to other blocks, it must be double guard-ring using N-well and P+ active to remove the substrate and coupling noise. In that case, the power metal should be connected to PAD directly. 2. The Bulk power is used to reduce the influence of substrate noise. 8 AL1213A 8-BIT 0.5MSPS DAC PACKAGE CONFIGURATION Cc 5V Ct 1 VDDA NC 28 2 NC NC 27 3 VBB NC 26 4 VDDA NC 25 5 VSSA AOUT 24 6 NC VRT 23 7 NC VRB 22 D[7] 8 D[7] NC 21 D[6] 9 D[6] NC 20 D[5] 10 D[5] NC 19 D[4] 11 D[4] NC 18 D[3] 12 D[3] NC 17 D[2] 13 D[2] NC 16 D[1] 14 D[1] D[0] 15 0V VOUT Cc AL1213A Location Description Ct 10mF TANTALUM CAPACITOR Cc 0.1mF CERAMIC CAPACITOR L1,L2 FERRITE BEAD ( 0.1mh ) Ct VRT(5V) VRB(0V) D[0] 9 8-BIT 0.5MSPS DAC AL1213A PACKAGE PIN DESCRIPTION Name Pin No I/O Type Pin Description VDDA 1,4 AP Analog Power VBB 3 AG Analog Ground VSSA 5 AG Analog Ground DI0 ~ DI7 8 ~ 15 DI Digital Input Data VRB 22 AI Voltage Reference Bottom (0V) VRT 23 AI Voltage Reference Top (5V) AOUT 24 AO Analog Voltage Output NC 2,6,7,16,17,18 19,20,21,25,26 27,28 DO No Connection PC BOARD LAYOUT CONSIDERATIONS PC Board Considerations To minimize noise on the power lines and the ground lines, the digital inputs need to be shielded and decoupled. This trace length between groups of VDD (VDDA, VDDD) and VSS (VSSA, VSSD) pins should be as short as possible so as to minimize inductive ringing. Supply Decoupling and Planes For the decoupling capacitor between the power line and the ground line, 0.1mF ceramic capacitor is used in parallel with a 10mF tantalum capacitor. The digital power plane (VDDD) and analog power plane (VDDA) are connected through a ferrite bead, and also the digital ground plane (VSSD) and the analog ground plane (VSSA). This ferrite bead should be located within 3inches of the AL1213A. The analog power plane supplies power to the AL1213A of the analog output pin and related devices. 10 AL1213A 8-BIT 0.5MSPS DAC FEEDBACK REQUEST We appreciate your interest in out products. If you have further questions, please specify in the attached form. Thank you very much. DC/AC Electrical Characteristic Characteristics Min Typ Max Supply Voltage Unit Remarks V Power dissipation mW Resolution Bits Analog Output Voltage V Operating Temperature °C Output Load Capacitor pF Output Load Resistor Ω Integral Non-Linearity Error LSB Differential Non-Linearity Error LSB Maximum Conversion Rate MHz Voltage Output DAC Characteristics Reference Voltage Min Typ Max TOP BOTTOM Unit Remarks V Analog Output Voltage Range V Digital Input Format Binary Code or 2's Complement Code Current Output DAC Characteristics Min Typ Max Unit Analog Output Maximum Current mA Analog Output Maximum Signal Frequency MHz Reference Voltage V External Resistor for Current Setting (RSET) Ω Pipeline Delay • Do you want to Power down mode? • Do you want to Internal Reference Voltage (BGR)? • Which do you want to Serial Input TYPE or parallel Input TYPE? • Do you need 3.3V and 5V power supply in your system? Remarks sec 11 8-BIT 0.5MSPS DAC AL1213A HISTORY CARD 12 Version Date Modified Items Ver 1.0 Jun.'98 Original version published Ver 2.0 Feb.'00 Core layout Guide update Ver 2.1 Apr.'02 Phantom Cell information update Comments