SPT1019BIN

SPT1019 ETC2

Document overview

• Manufacturer or author: Provided By www.digicamel.com(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 12

Technical content

@MSPT SIGNAL PROCESSING TECHNOLOGIES 8-BIT, HIGH SPEED D/A CONVERTER FEATURES APPLICATIONS * 275 MWPS Conversion Rate - Version A + High Resolution Color or Monochrome Raster * 165 MWPS Conversion Rate - Version B Graphics Displays + Compatible with the HDAC10181 + Medical Electronics: CAT, PET, MR Imaging Displays with Improved Performance * CAD/CAE Workstations + RS-343-A Compatible + Solids Modeling + Complete Video Controls: Sync, Blank, Bright * General Purpose High-Speed D/A Conversion and Reference White (Force High) + Digital Synthesizers + 10KH, 100K ECL Compatible + Automated Test Equipment * Single Power Supply + Digital Transmitters/Modulators + Registered Data and Video Controls + Differential Current Outputs + Stable On-Chip Bandgap Reference + ESD Protected Data and Control Inputs GENERAL DESCRIPTION pin-compatible with the HDAC10181 with improved perfor- z mance. The SPT1019 contains data and control input regis- The SPT1019 is amonolithic 8-bit digital-to-analog converter ters, video control logic, reference buffer, and current capable of accepting video data at a 165 or 275 MWPS rate. switches. Complete with video controls (Sync, Blank, Reference White [Force High], Bright), the SPT1019 directly drives doubly- The SPT1019 is available in a 24-lead PDIP package in the terminated 50 or 75 ohm loads to standard composite video _ industrial temperature range. Contact the factory for military levels. The standard setup levelis 7.5 IRE. The SPT1019 is temperature and /883 versions BLOCK DIAGRAM on Video Data by) FN -~—y oun outs ‘Switches 47To 15 (MSBs) 'set Ref Ref Out Comp Reference ° e e Signal Processing Technologies, Inc.

4755 Forge Road, Colorado Springs, Colorado 80907, USA

Phone: (719) 528-2300 FAX: (719) 528-2370

ABSOLUTE MAXIMUM RATING (Beyond which damage may occur)! Supply Voltages Temperature JUNCHION eee eee cette #175 °C (measured to Vcc) Note: 1. Operation at any Absolute Maximum Ratings is not implied. See Electrical Specifications for proper nominal applied conditions in typical applications. ELECTRICAL SPECIFICATIONS Voc =ground, VEE = -5.2 V40.3 V, Ta =TMIN to Tmax, Co = 0 pF, Iset = 1.105 mA, unless otherwise sprecified TEST TEST PARAMETERS CONDITIONS LEVEL MIN TYP MAX | UNITS DC ELECTRICAL CHARACTISTICS, Integral Linearity Error 1.0 MA<I set<1.3 MA Vi -.37 +37 % Full Scale -.95 +95 | LSB Differential Linearity Error 1.0 mA<Iset<1.3 MA Vi 0.2 +0.2 % Full Scale 0.5 +0.5 | LSB Compliance Voltage, + Output ee ee 1.2 15 [Vv Compliance Voltage, - Output ee ee “1.2 15 [Vv Convert Voltage, IV 0.5 25 1V Common Mode Range (Vicm) Input Current, Logic LOW, Vi 35 120 | pA Data and Controls Input Current, Logic HIGH, Vi 40 120 | pA Data and Controls Bandgap Tempco ee SPT SPT1019 2 514/97

Voc =ground, Veg = -5.2 V 40.3 V, Ta =TuIn to Tuax, Co = 0 pF, Iget = 1.105 mA, unless otherwise specified. [conomons | ever | ww ve a PARAMETERS CONDITIONS LEVEL MIN TYP MAX | UNITS Reference Voltage Data and Controls Power Supply Sensitiv po 9 204120 | a Supply Current Po is 220 Tima DYNAMIC CHARACTERISTICS (Ri = 37.5 ohms, Ci = 5 pF, Ta = 25 °C, ISet = 1.105 mA) Maximum Conversion Rate B Grade IV 165 MWPS A Grade \\v 275 MWPS Ta = TIN to TMAX IV 2.0 ns Ri = 25 ohms Current Settling Time, Clocked Mode ns Current Settling Time, Clocked Mode ns tsi Ri = 252 tosc Ta = Tin to Tmax IV 45 ns Transparent Mode tpst IV 6.0 ns tew, tPwH A Grade \\v 18 ns Glitch Energy pV-s Reference Bandwidth, -3 dB a NA 2 Setup Time, Data and Controls Vv 1.0 ns tH Ta = Ton to TMax. IV ns Ta = Tn to Tuax. Vv 325 Wis Ta = TMIN to Tmax \\v -48 | dB TEST LEVEL CODES TESTLEVEL TEST PROCEDURE All electrical characteristics are subject to the I 100% production tested at the specified temperature. following conditions: mT 100% production tested at Ta = +25 °C, and sample All parameters having min/max specifications tested at the specified temperatures. are guaranteed. The Test Level column indi- Ml QA sample tested only at the specified temperatures. cates the specific device testing actually per- IV Parameter is guaranteed (but not tested) by design formed during production and Quality Assur- and characterization data. ance inspection. Any blank section in the data Vv Parameter is a typical value for information purposes column indicates that the specification is not only. tested at the specified condition. vl 100% production tested at Ta = +25 °C. Parameter is guaranteed over specified temperature range. SPT SPT1019 3 814/97

Figure 1 - Functional Diagram Current Do-D7 -—~» Decoding x a Sources |_| Out + - And || Composite ox Logic Y | switches Out- Video Controls Data Registers CONV —— 9 Current CONV 2 Source Biasing Feedthrough Bandgap Reference VEE Voc Iget Ref Out APPLICATION INFORMATION coarse output levels. The remaining four LSBs drive four binary weighted current switches. TI T101 high -to-anal - Jone capable of corer eee crue oTS WPS. This The MSB currents are then summed with the LSBs, which makes the device suitable for driving 1500 X 1800 pixel provide a one-sixteenth of full scale contribution, to provide displays at 70 to 90 Hz update rates. the 256 distinct analog output levels The SPT1019 is separated into different conversion rate The video control inputs drive weighted current sinks that are categories as shown in table I. added to the output current to produce composite video output levels. These controls, Sync, Blank, Reference White The SPT1019 has 10 KH and 100K ECL logic level compat-__ (Force High), and Bright are needed in video applications. ible video controls and data inputs. The complementary analog output currents produced by the devices are propor- Another feature that similar video D/A converters do nothave tional to the product of the digital control and data inputs in _'S the Feedthrough Control. This pin allows registered or Conjunction with the analog reference current. The SPT1019 _UNFegistered operation of the video control and data inputs. ig segmented so that the four MSBs of the input data are _‘I the registered mode, the composite functions are latched separated into a parallel thermometer code. From here, _'0 the pixel data to prevent screen-edge distortions generally fifteen identical current sinks are driven to fabricate sixteen found on unregistered video DACs. Table | - The SPT1019 Family and Speed Designations PART NUMBER UPDATE COMMENTS SPT1019A 275 MWPS Suitable for 1200 X 1500 to 1500 X 1800 displays at 60 to 90 Hz update rate. SPT1019B 165 MWPS Suitable for 1024 X 1280 to 1200 X 1500 displays at 60 to 90 Hz update rate. SPT SPT1019 4 s4s7

Figure 2 - Typical Interface Circuit Video Monitor a seo, | oak ed | fy H my ae | ns 75.0 or nd Sd ed =o ca |] § F333 NOTES: Video 4, Ve =-1.2V (typical) for LM113, 2 to} 410 15 Dre ie | OT(R1+Re) cow {Taam 5. Vow. = Ke Diatallamui cade 5554] RL + [K) x Iset x RL(Bright)] a me 8. Veyme = (KX Igor X Ru) + (Ko X Iset X Ri) 4 vs K = 15.8069 we —= K, = 10.0392 S 7. FB = Ferrite bead, Fair-rite P/N 217430011 or equivalent. Too _ cour 8. All reference resistors 1/8 W 1% metal film power. one supply decoupling 50 V ceramic disc. Chae Cconp 9 —*— = ECL termination hy Se 10. Woo AGND ae 11 See figure 8 for detail on Ref Butter. 12. Ret Out on the SPT1019 can be used to drive up to two SPT1018 reference inputs. 13. = DGND (digital input drivers). TYPICAL INTERFACE CIRCUIT -2 volt supply. Standard SIP (Single Inline Package) 220/330 resistor networks are available for this purpose. It is recom- GENERAL mended that stripline or microstrip techniques be used for all ECL interface. Printed circuit wiring of known impedance Atypical interface circuit using the SPT1019 in acolor raster ©V@r a Solid ground plane is recommended. application is shown in figure 2. The SPT1019 requires few external components and is extremely easy to use. The very OUTPUT CONSIDERATIONS high operating speeds of the SPT1019 require good circuit A layout, decoupling of supplies, and proper design of trans- The analog outputs are designed to directly drive a dual 50 or mission lines. The following considerations should be noted 7© Ohm load transmission system as shown. The source to achieve best performance. impedances of the SPT1019 outputs are high impedance current sinks. The load impedance (RL) must be 25 INPUT CONSIDERATIONS or 37.5 ohms to attain standard RS-343-A video levels. Any deviation from this impedance will affect the resulting video Video input data and controls may be directly connected to output levels proportionally. As with the data interface, it is the SPT1019. Note that all ECL inputs are terminated as __MPortant that the analog transmission lines have matched closely to the device as possible to reduce ringing, crosstalk | iMPedance throughout, including connectors and transitions and reflections. A convenient and commonly used microstrip between printed wiring and coaxial cable. The combination of impedance is about 130 ohms, which is easily terminated matched source termination resistor Rs and load terminator using a 330 ohm resistor to VEE and a 220 ohm resistor to RL Minimizes reflections of both forward and reverse travel- Ground. This arrangement gives a Thevenin equivalent ter- ing waves inthe analogtransmission system. The return path mination of 130 ohms to -2 volts without the need for a fr analog output current is Voc which is connected to the source termination resistor Rs. SPT SPT1019 5 s4s7

POWER CONSIDERATIONS The output of the buffer amplifier is the reference for the current sinks. The amplifier feedback loop is connected The SPT1019 operates from a single -5.2 V standard supply. around one of the current sinks to achieve better accuracy. Proper bypassing of the supplies willaugmenttheSPT1019’s_ (See Figure 8.) inherent supply noise rejection characteristics. As shown in figure 2, each supply pin should be bypassed as close tothe Sincethe analog output currents are proportional to the digital device as possible with 0.01 4F and 10 yF capacitors. input data and the reference current (Ic), the full-scale output may be adjusted by varying the reference current. Ise; The SPT1019 has two analog (VEE) power supply pins. Both is controlled through the Ig.4input on the SPT1019. Amethod supply pins should be properly bypassed as mentioned _and equations to set I<g4 is shown in Figure 2. The SPT1019 previously. This device also has two analog (Vcc) ground _uses its own reference voltage for setting up Is_4as shown in pins. Both ground pins should be tied to the analog ground Figure 2. The value for Ig. can be varied with the 500 Ohm plane. Power and ground pins must be connected in all _trimmertochange the full scale output. A double 50 Ohm load applications. If a +5 V power source is required, the ground (25 Ohm) can be driven if Igq¢ is increased 50% more than Igor pins (Vcc) become the positive supply pins while the supply —_ for doubly terminated 75 Ohm video applications. pins (Vee) become the ground pins. The relative polarities of the other input and output voltages must be maintained. COMPENSATION REFERENCE CONSIDERATIONS The SPT1019 provides an external compensation input (COMP) for the reference buffer amplifier. In order to use this The SPT1019 has one reference input (Iset) and one refer- pin correctly, a capacitor should be connected between ence output (Ref Out). These pins are connected to the © COMP and Veg as shown in figure 2. Keep the lead lengths inverting and noninverting inputs of an internal amplifier that | as short as possible. If the reference is to be kept as a serves as a reference buffer amplifier. The SPT1019 has a _ constant, use a large capacitor (.01 F). The value of the bandgap reference connected internally to the invertinginput + capacitor determines the bandwidth of the amplifier. If modu- of the buffer amplifier and Ref Out. lation of the reference is required, smaller values of capaci- tance can be used to achieve up to a 1 MHz bandwidth. Figure 3 - Timing Diagram tpwe TONY —\\ poof ofN poo DBI TI IT TR conv ef f Vd tpwe ts thy gy weeeeee- ie----. Data Control NY

7 Inputs

tose. vewse our- r \\ at OUT + —— fey veise SPT SPT1019 6 514/97

Table Il - Video Control Operation (Output values for setup = 10 IRE and 75 ohm standard load) [se | om | sie | won | St | one | ote | ort |omsin | i ee a A SS A ES (S| a oo a A OY OO CO ee Pee ere |e Prenton] a A A CO (| ee Prin | od DATA INPUTS AND VIDEO CONTROLS, The video controls produce the output levels needed for horizontal blanking, frame synchronization, etc., to be com- The SPT1019 has standard single-ended data inputs. The _ patible with video system standards as described in inputs are registered to produce the lowest differential data. RS-343-A. Table II shows the video control effects on the propagation delay (skew) to minimize glitching. There are —_ analog output. Internal logic governs Blank, Sync, and Force also four video control inputs to generate composite video _ High so that they override the data inputs as needed in video outputs. These are Sync, Blank, Bright and Reference White —_ applications. Sync overrides both the data and other controls or Force High. Also provided is the Feedthrough control as _ to produce full negative video output (figure 9). mentioned earlier. The controls and data inputs are all 10 KH and 100K ECL compatible. In addition, all have internal Reference White video level output is provided by Force pulldown resistors to leave them at a logic low sothe pins are —_ High, which drives the internal digital data to full scale output inactive when not used. This is useful if the devices are —_ or 100 IRE units. Bright gives an additional 10% of full scale applied as standard DACs without the need for video controls _ value to the output level. This function can be used in graphic or if less than eight bits are used. displays for highlighting menus, cursors or warning mes- sages. Again, if the devices are used in non-video applica- The SPT1019 is usually configured in the synchronous __ tions, the video controls can be left open. mode. In this mode, the controls and data are synchronized to prevent pixel dropout. This reduces screen-edge distor- CONVERT CLOCK tions and provides the lowest output noise while maintaining the highest conversion rate. By leaving the Feedthrough (FT) — For best performance, the clock should be ECL driven, control open (low), each rising edge of the convert (CONV) differentially, by utilizing CONV and CONV (figure 4). By clock latches decoded data and control values intoa D-type — driving the clock this way, clock noise and power supply/ internal register. The registered data is then converted into —_ output intermodulation will be minimized. The rising edge of the appropriate analog output by the switched current sinks. the clock synchronizes the data and control inputs to the When FT is tied high, the control inputs and data are not + SPT1019. Since the actual switching threshold of CONV is registered. The analog output asynchronously tracks the determined by CONV, the clock can be driven single-ended input data and video controls. Feedthrough itself is asynchro- —_ by connecting a bias voltage to CONV . The switching thresh- nous and usually used as a DC control. old of CONV is set by this bias voltage. The controls and data have to be present at the input pins for + ANALOG OUTPUTS a setup time of ts before, and a hold time of th after, the rising edge of the clock (CONV) in order to be synchronously The SPT1019 has two analog outputs that are high imped- registered. The setup and hold times are notimportantinthe — ance, complementary current sinks. The outputs vary in asynchronous mode. The minimum pulse widths high (tpwH) proportion to the input data, controls and reference current and low (tpwL) as well as settling time become the limiting _ values so that the full scale output can be changed by setting factors. (See figure 3.) Iset as mentioned earlier. In video applications, the outputs can drive a doubly termi- SPT SPT1019 7 814/97

nated 50 or 75 ohm load to standard video levels. In the TYPICAL RGB GRAPHICS SYSTEM standard configuration of figure 5, the output voltage is the product of the output current and load impedance and is —_inanRGBgraphics system, the color displayed is determined between 0 and -1.07 V. The Out- output (figure 9) will provide —_ py the combined intensities of the red, green and blue (RGB) a video output waveform with the Sync pulse bottom at the —_ D/A converter outputs. A change in gain or offset in any of the -1.07 V level. The Outs is inverted with Sync up RGB outputs will affect the apparent hue displayed on the CRT screen. Figure 4- CONVert, CONVert Switching Levels Thus, it is very important that the outputs of the D/A convert- Vior ers track each other over a wide range of operating condi- —_—— SS ov tions. Since the D/A outputis proportional to the productof the

7 Ree rerrnrerrnnerserereneeeeeees Yi reference and digital input code, acommon reference should

/\\ MN be used to drive all three D/As in an RGB system to minimize ms ms RGB DAC-to-DAC mismatch and improve TC tracking. Me The SPT1019 contains an internal precision bandgap refer- eee SK conv ence which completely eliminates the need for an external Vigu yay, “cstttstiseneeeenemneenenh /\\ COW reference. The reference can supply up to 50 A to an external load, such as two other DAC reference inputs. Figure 5A - Standard Load The circuits shown in figure 6 illustrate how a single SPT1019 Video Monitor may be used as a master reference in a system with multiple ponent DACs (suchas RGB). The other DACs are simply slaved from ot ©)_acom _) ff the SPT1019's reference output. The SPT1018s shown are ] H especially well-suited to be slaved to a SPT1019 for a better i maf TC tracking from DAC-to-DAC, since they are essentially Hi : SPT1019s without the reference. The SPT1018 is pin-com- Vv i Vv H patible with the TDC 1018, that does not have an internal ours Coan a inverse reference. Although either the TDC1018orthe SPT1018 may ° "Video be slaved from an SPT1019, the higher performance Bs ry SPT1018 and the above mentioned DAC-to-DAC TC track- me me ing is the best choice for new designs. Vv Vv No external reference is required for operation of the Figure 5B - Test Load SPT1019, as this function is provided internally. The internal reference is a bandgap type and is suitable for operation over OUT + Video Out extended temperature ranges. The SPT1018 must use an our: Oto -1 Volt external reference. CL RL <5 pF 37.5 SPT SPT1019 8 814/97

Figure 6 - Typical RGB Graphics System SPT1019 SPT1018 SPT1018 (Master) —VR| “siavey VS (Slave) V8 'set Ref Out Ret+ | Ret- Ret+ | Ref- Ry Re 500.2 750.2 Ret 5002 7502 5002 7502 — SS SS 'set set ‘set V V 1kO V 1ka Figure 7 - Burn-in Circuit 89V0 (Max 200 mA)

24 Pin DIP

see £52 All Resistors Are 5% 1/4 W cc Clock = -0.9 to -1.7 V, 100 kHz vee (Max 50 mA) out 412V0 Ref Out outs HMSO mA 1000 (Max 1.5 mA) toa U V tka ‘set aavo om (ax 1.8m) V7 (Max 60 yA) CONV Vee Clock © (Max 60 HA) V Figure 8 - DAC Output Circuit Current Current Sink #1 Sink #N Hi ~ fo Out i i i TO Ou Reference Reference | i i H Amplifier Current H : i | | \\ I Ref Out | I H | ‘Seg 4 'seg © Comp SPT SPT1019 9 s4s7

Figure 9 - Video Output Waveform for Standard Load

256 Gray Levels Video

| Normal Low (Black) 75 -728mV - Biggie OTB MV wpa oosnoaennaennaaenanenacy sootontonnosn SV nn) Figure 10- Equivalent Input Circuit - Data, Clock, Controls and Reference 1 1 1 1 Conv aa . Ref Out 0 Conv + 'set © 'Bias db Vee felons Y) Segment ‘Switch \\ I ! I \\ \\ \\ Data and v ® Sas ® Y) Bias Controls y ee 80 ka 'Bias Vee SPT SPT1019 10 814/97

eso. nS symeo. [MIN | MAX [MIN | MAX_| nal r a [es | ois | o195 | aie | 9.43 | AANNAANRAAN RAN [—c | 0015 | 0022 | os | 056 [Ff | 0008 | oo12 | 020 | 0.30 | [~e7Torsoyp [| asite | [i [0530 | 0550 | 13.46 | 1397 _| YYYY YY YY VY VV Vv [ «| oo70[ oso | _i78 [| 203 | J e=—t—+| 4+ al ° 8} F alee | fee {fre SPT SPT1019 W s/1A/97

PIN ASSIGNMENTS PIN FUNCTIONS Name Function D3 D4 3 ata Bit 3 > Be D2 Data Bit 2 p2[2| [23] Ds D1 Data Bit 1 o 6 DO Data BO (LSB) [2"] i Do 2) 57 VEE Negative Supply Vee L5| [29] Vee CONV Convert Clock Input conv [| PDIP [2] ous CONV Convert Clock Input Complement CONV Out - FT Register Feedthrough Control Ft[s| Veo Voc Positive Supply Vec[ | Comp FH Data Force High Control FH [15] Iset Blank Video Blank Input Blank [11 Ref Out BRT Video Bright Input BRT Sync Sync Video Sync Input Ref Out Reference Output Iset Reference Current + Input COMP Compensation Input Out- Output Current Negative Out+ Output Current Positive D7 Data Bit 7 (MSB) Dé Data Bit 6 DS Data Bit 5 D4 Data Bit 4

ORDERING INFORMATION

PART NUMBER DESCRIPTION TEMPERATURE RANGE PACKAGE SPT1019AIN 8-BIT, 275 MWPS DAC -25 to +85 °C 24L PDIP SPT1019BIN 8-BIT, 165 MWPS DAG -25 to +85 °C 24L PDIP Signal Processing Technologies, Inc. reserves the right to change products and specifications without notice. Permission is hereby expressly granted to copy this literature for informational purposes only. Copying this material for any other use is strictly prohibited. WARNING - LIFE SUPPORT APPLICATIONS POLICY - SPT products should not be used within Life Support Systems without the specific written consent of SPT. A Life Support System is a product or system intended to support or sustain life which, if it fails, can be reasonably expected to result in significant personal injury or death. Signal Processing Technologies believes that ultrasonic cleaning of its products may damage the wire bonding, leading to device failure. It is therefore not recommended, and exposure of a device to such a process will void the product warranty. S PT SPT1019 12 514/97