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DS90C385A +3.3V Programmable LVDS Transmitter 24-bit Flat Panel Display (FPD) Link-87.5 MHz
PRELIMINARY
October 2005
DS90C385A +3.3V Programmable LVDS Transmitter 24-Bit Flat Panel Display Link-87.5 MHz
General Description
The DS90C385A is a pin to pin compatible replacement for DS90C383, DS90C383A and DS90C385. The DS90C385A has additional features and improvements making it an ideal replacement for DS90C383, DS90C383A and DS90C385. family of LVDS Transmitters. The DS90C385A transmitter converts 28 bits of LVCMOS/ LVTTL data into four LVDS (Low Voltage Differential Signaling) data streams. A phase-locked transmit clock is transmitted in parallel with the data streams over the fifth LVDS link. Every cycle of the transmit clock 28 bits of input data are sampled and transmitted. At a transmit clock frequency of 87.5 MHz, 24 bits of RGB data and 3 bits of LCD timing and control data (FPLINE, FPFRAME, DRDY) are transmitted at a rate of 612.5Mbps per LVDS data channel. Using a 87.5 MHz clock, the data throughput is 306.25Mbytes/sec. This transmitter can be programmed for Rising edge strobe or Falling edge strobe through a dedicated pin. A Rising edge or Falling edge strobe transmitter will interoperate with a Falling edge strobe FPDLink Receiver without any translation logic. This chipset is an ideal means to solve EMI and cable size problems associated with wide, high-speed TTL interfaces with added Spread Spectrum Clocking support.
Features
n Pin-to-pin compatible to DS90C383, DS90C383A and DS90C385 . n No special start-up sequence required between clock/data and /PD pins. Input signals (clock and data) can be applied either before or after the device is powered. n Support Spread Spectrum Clocking up to 100kHz frequency modulation & deviations of 2.5% center spread or -5% down spread. n "Input Clock Detection" feature will pull all LVDS pairs to logic low when input clock is missing and when /PD pin is logic high. n 18 to 87.5 MHz shift clock support n Tx power consumption < 147 mW (typ) @ 87.5 MHz Grayscale n Tx Power-down mode < 60 W (typ) n Supports VGA, SVGA, XGA, SXGA(dual pixel), SXGA+(dual pixel), UXGA(dual pixel). n Narrow bus reduces cable size and cost n Up to 2.45 Gbps throughput n Up to 306.25Megabytes/sec bandwidth n 345 mV (typ) swing LVDS devices for low EMI n PLL requires no external components n Compliant to TIA/EIA-644 LVDS standard n Low profile 56-lead TSSOP package
Block Diagram
DS90C385A
20070201
Order Number DS90C385AMT See NS Package Number MTD56
(c) 2005 National Semiconductor Corporation
DS200702
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DS90C385A
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) CMOS/TTL Input Voltage LVDS Driver Output Voltage LVDS Output Short Circuit Duration Junction Temperature Storage Temperature Lead Temperature (Soldering, 4 sec) MTD56 (TSSOP) Package: DS90C385AMT -0.3V to +4V -0.5V to (VCC + 0.3V) -0.3V to (VCC + 0.3V) Continuous +150C -65C to +150C
Package Derating: DS90C385AMT ESD Rating (HBM, 1.5k, 100pF) (EIAJ, 0, 200 pF) Latch Up Tolerance @ 25C
12.5 mW/C above +25C 7kV 500V
100mA
Recommended Operating Conditions
Min Supply Voltage (VCC) 3.0 -10 Operating Free Air Temperature (TA) Supply Noise Voltage (VCC) +25 +70 C 200 mVPP 18 87.5 MHz Nom 3.3 Max Units 3.6 V
+260C
Maximum Package Power Dissipation Capacity @ 25C
1.63 W
TxCLKIN frequency
Electrical Characteristics
Over recommended operating supply and temperature ranges unless otherwise specified. Symbol VIH VIL VCL IIN Parameter High Level Input Voltage Low Level Input Voltage Input Clamp Voltage Input Current ICL = -18 mA VIN = 0.4V, 2.5V or VCC VIN = GND LVDS DC SPECIFICATIONS VOD VOD VOS VOS IOS IOZ Differential Output Voltage Change in VOD between complimentary output states Offset Voltage (Note 4) Change in VOS between complimentary output states Output Short Circuit Current Output TRI-STATE (R) Current VOUT = 0V, RL = 100 Power Down = 0V, VOUT = 0V or V CC RL = 100, CL = 5 pF, Worst Case Pattern (Figures 1, 3 ) " Typ " values are given for VCC = 3.6V and TA = +25C, " Max " values are given for VCC = 3.6V and TA = -10C f = 25 MHz f = 40 MHz f = 65 MHz f = 87.5 MHz -3.5 1.13 1.25 RL = 100 250 345 450 35 1.38 35 -5 mV mV V mV mA A -10 Conditions Min 2.0 0 -0.79 +1.8 0 Typ Max VCC 0.8 -1.5 +10 Units V V V A A LVCMOS/LVTTL DC SPECIFICATIONS
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TRANSMITTER SUPPLY CURRENT ICCTW Transmitter Supply Current Worst Case 31 37 48 55 45 50 60 65 mA mA mA mA
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DS90C385A
Electrical Characteristics
Symbol ICCTG Parameter Transmitter Supply Current 16 Grayscale TRANSMITTER SUPPLY CURRENT
(Continued) Over recommended operating supply and temperature ranges unless otherwise specified. Conditions RL = 100, CL = 5 pF, 16 Grayscale Pattern (Figures 2, 3 ) " Typ " values are given for VCC = 3.6V and TA = +25C, " Max " values are given for VCC = 3.6V and TA = -10C f = 25 MHz f = 40 MHz f = 65 MHz f = 87.5 MHz Min Typ 29 33 39 44 17 Max 40 45 50 55 150 Units mA mA mA mA A
ICCTZ
Transmitter Supply Current Power Down
Power Down = Low Driver Outputs in TRI-STATE under Power Down Mode
Note 1: "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The tables of "Electrical Characteristics" specify conditions for device operation. Note 2: Typical values are given for VCC = 3.3V and TA = +25C unless specified otherwise. Note 3: Current into device pins is defined as positive. Current out of device pins is defined as negative. Voltages are referenced to ground unless otherwise specified (except VOD and VOD). Note 4: VOS previously referred as VCM.
Recommended Transmitter Input Characteristics
Over recommended operating supply and temperature ranges unless otherwise specified Symbol TCIT TCIP TCIH TCIL TXIT TXPD TxCLK IN Transition Time (Figure 5) TxCLK IN Period (Figure 6) TxCLK IN High Time (Figure 6) TxCLK IN Low Time (Figure 6) TxIN , and PWR DOWN pin Transition Time Minimum pulse width for PWR DOWN pin signal. Parameter Min 1.0 11.42 0.35T 0.35T 1.5 1 T 0.5T 0.5T Typ Max 6.0 55.55 0.65T 0.65T 6.0 Units ns ns ns ns ns us
Transmitter Switching Characteristics
Over recommended operating supply and temperature ranges unless otherwise specified Symbol LLHT LHLT TPPos0 TPPos1 TPPos2 TPPos3 TPPos4 TPPos5 TPPos6 Parameter LVDS Low-to-High Transition Time (Figure 4) LVDS High-to-Low Transition Time (Figure 4) Transmitter Output Pulse Position (Figure 12) (Note 5) Transmitter Output Pulse Position Transmitter Output Pulse Position Transmitter Output Pulse Position Transmitter Output Pulse Position Transmitter Output Pulse Position Transmitter Output Pulse Position f = 25MHz -0.45 5.26 10.98 16.69 22.41 28.12 33.84 Min Typ 0.75 0.75 0 5.71 11.43 17.14 22.86 28.57 34.29 Max 1.4 1.4 +0.45 6.16 11.88 17.59 23.31 29.02 34.74 Units ns ns ns ns ns ns ns ns ns
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DS90C385A
Transmitter Switching Characteristics
Symbol TPPos0 TPPos1 TPPos2 TPPos3 TPPos4 TPPos5 TPPos6 TPPos0 TPPos1 TPPos2 TPPos3 TPPos4 TPPos5 TPPos6 TPPos0 TPPos1 TPPos2 TPPos3 TPPos4 TPPos5 TPPos6 TSTC THTC TCCD Parameter Transmitter Output Pulse Position (Figure 12) (Note 5) Transmitter Output Pulse Position Transmitter Output Pulse Position Transmitter Output Pulse Position Transmitter Output Pulse Position Transmitter Output Pulse Position Transmitter Output Pulse Position Transmitter Output Pulse Position (Figure 12) (Note 5) Transmitter Output Pulse Position Transmitter Output Pulse Position for Bit 2 Transmitter Output Pulse Position for Bit 3 Transmitter Output Pulse Position Transmitter Output Pulse Position Transmitter Output Pulse Position Transmitter Output Pulse Position (Figure 12) (Note 5) Transmitter Output Pulse Position Transmitter Output Pulse Position Transmitter Output Pulse Position Transmitter Output Pulse Position Transmitter Output Pulse Position Transmitter Output Pulse Position Required TxIN Setup to TxCLK IN (Figure 6) at 85MHz Required TxIN Hold to TxCLK IN (Figure 6) at 87.5 MHz TxCLK IN to TxCLK OUT Delay. Measure from TxCLK IN edge to immediately crossing point of differential TxCLK OUT by following the positive TxCLK OUT. 50% duty cycle input clock is assumed. (Figure 7)
(Continued) Over recommended operating supply and temperature ranges unless otherwise specified Min f = 40 MHz -0.25 3.32 6.89 10.46 14.04 17.61 21.18 f = 65 MHz -0.20 2.00 4.20 6.39 8.59 10.79 12.99 f = 87.5 MHz -0.20 1.48 3.16 4.84 6.52 8.20 9.88 2.5 0.5 TA = -10, and 87.5MHz for " Min ", TA = 70, and 25MHz for " Max ", VCC = 3.6V, R_FB pin = VCC TA = -10, and 87.5MHz for " Min ", TA = 70, and 25MHz for " Max ", VCC = 3.6V, R_FB pin = GND 3.086 7.211 Typ 0 3.57 7.14 10.71 14.29 17.86 21.43 0 2.20 4.40 6.59 8.79 10.99 13.19 0 1.68 3.36 5.04 6.72 8.40 10.08 Max +0.25 3.82 7.39 10.96 14.54 18.11 21.68 +0.20 2.40 4.60 6.79 8.99 11.19 13.39 +0.20 1.88 3.56 5.24 6.92 8.60 10.28 Units ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
Measure from TxCLK IN edge to immediately crossing point of differential TxCLK OUT by following the positive TxCLK OUT. 50% duty cycle input clock is assumed. (Figure 8)
2.868
6.062
ns
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DS90C385A
Transmitter Switching Characteristics
Symbol SSCG Parameter Spread Spectrum Clock support; Modulation frequency with a linear profile.(Note 6)
(Continued) Over recommended operating supply and temperature ranges unless otherwise specified Min f = 25 MHz f = 40 MHz f = 65 MHz f = 87.5 MHz Typ 100kHz 2.5%/-5% 100kHz 2.5%/-5% 100kHz 2.5%/-5% 100kHz 2.5%/-5% 10 100 ms ns Max Units
TPLLS TPDD
Transmitter Phase Lock Loop Set (Figure 9) Transmitter Power Down Delay (Figure 11)
Note 5: The Minimum and Maximum Limits are based on statistical analysis of the device performance over process, voltage, and temperature ranges. This parameter is functionality tested only on Automatic Test Equipment (ATE). Note 6: Care must be taken to ensure TSTC and THTC are met so input data are sampling correctly. This SSCG parameter only shows the performance of tracking Spread Spectrum Clock applied to TxCLK IN pin, and reflects the result on TxCLKOUT+ and TxCLKOUT- pins.
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DS90C385A
AC Timing Diagrams
20070204
FIGURE 1. "Worst Case" Test Pattern (Note 7)
20070205
FIGURE 2. "16 Grayscale" Test Pattern - DS90C385A (Notes 8, 9, 10)
Note 7: The worst case test pattern produces a maximum toggling of digital circuits, LVDS I/O and LVCMOS/LVTTL I/O. Note 8: The 16 grayscale test pattern tests device power consumption for a "typical" LCD display pattern. The test pattern approximates signal switching needed to produce groups of 16 vertical stripes across the display. Note 9: Figures 1, 2 show a falling edge data strobe (TxCLK IN/RxCLK OUT). Note 10: Recommended pin to signal mapping. Customer may choose to define differently.
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DS90C385A
AC Timing Diagrams
(Continued)
20070230
FIGURE 3. DS90C385A (Transmitter) LVDS Output Load. 5pF is showed as board loading
20070206
FIGURE 4. DS90C385A (Transmitter) LVDS Transition Times
20070208
FIGURE 5. DS90C385A (Transmitter) Input Clock Transition Time
20070210
FIGURE 6. DS90C385A (Transmitter) Setup/Hold and High/Low Times with R_FB pin = GND (Falling Edge Strobe)
20070212
FIGURE 7. DS90C385A (Transmitter) Clock In to Clock Out Delay with R_FB pin = VCC
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DS90C385A
AC Timing Diagrams
(Continued)
20070235
FIGURE 8. DS90C385A (Transmitter) Clock In to Clock Out Delay with R_FB pin = GND
20070214
FIGURE 9. DS90C385A (Transmitter) Phase Lock Loop Set Time
20070217
FIGURE 10. 28 Parallel TTL Data Inputs Mapped to LVDS Outputs - DS90C385A
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DS90C385A
AC Timing Diagrams
(Continued)
20070218
FIGURE 11. Transmitter Power Down Delay
20070226
FIGURE 12. Transmitter LVDS Output Pulse Position Measurement - DS90C385A
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DS90C385A
DS90C385A MTD56 (TSSOP) Package Pin Descriptions -- FPD Link Transmitter
Pin Name TxIN TxOUT+ TxOUT- TxCLKIN R_FB TxCLK OUT+ TxCLK OUT- PWR DOWN VCC GND PLL VCC PLL GND LVDS VCC LVDS GND I/O I O O I I O O I I I I I I I No. 28 4 4 1 1 1 1 1 3 5 1 2 1 3 Description LVTTL level input. This includes: 8 Red, 8 Green, 8 Blue, and 4 control lines -- FPLINE, FPFRAME and DRDY (also referred to as HSYNC, VSYNC, Data Enable). Positive LVDS differentiaI data output. Negative LVDS differential data output. LVTTL Ievel clock input. Pin name TxCLK IN. LVTTL Ievel programmable strobe select (See Table 1). Positive LVDS differential clock output. Negative LVDS differential clock output. LVTTL level input. When asserted (low input) TRI-STATE the outputs, ensuring low current at power down. Power supply pins for LVTTL inputs. Ground pins for LVTTL inputs. Power supply pin for PLL. Ground pins for PLL. Power supply pin for LVDS outputs. Ground pins for LVDS outputs.
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DS90C385A
Applications Information
The DS90C385A is backward compatible with the DS90C385, DS90C383A, DS90C383 in TSSOP 56-lead package, and it is a pin-for-pin replacements. This device DS90C385A also features reduced variation of the TCCD parameter which is important for dual pixel applications. (See AN-1084) This device may also be used as a replacement for the DS90CF583 (5V, 65MHz) and DS90CF581 (5V, 40MHz) FPD-Link Transmitters with certain considerations/ modifications: 1. Change 5V power supply to 3.3V. Provide this 3.3V supply to the VCC, LVDS VCC and PLL VCC of the transmitter. 2. The DS90C385A transmitter input and control inputs accept 3.3V LVTTL/LVCMOS levels. They are not 5V tolerant. To implement a falling edge device for the DS90C385A, the R_FB pin may be tied to ground OR left unconnected (an internal pull-down resistor biases this pin low). Biasing this pin to Vcc implements a rising edge device.
ing feature where the input clock/data can be inserted after the release of the PD signal. In the case where the clock/ data is stopped and reapplied, such as changing video mode within Graphics Controller, it is not necessary to cycle the PD signal. However, there are in certain cases where the PD may need to be asserted during these mode changes. In cases where the source (Graphics Source) may be supplying an unstable clock or spurious noisy clock output to the LVDS transmitter, the LVDS Transmitter may attempt to lock onto this unstable clock signal but is unable to do so due the instability or quality of the clock source. The PD signal in these cases should then be asserted once a stable clock is applied to the LVDS transmitter. Asserting the PWR DOWN pin will effectively place the device in reset and disable the PLL, enabling the LVDS Transmitter into a power saving standby mode. However, it is still generally a good practice to assert the PWR DOWN pin or reset the LVDS transmitter whenever the clock/data is stopped and reapplied but it is not mandatory for the DS90C385A. SPREAD SPECTRUM CLOCK SUPPORT The DS90C385A can support Spread Spectrum Clocking signal type inputs. The DS90C385A outputs will accurately track Spread Spectrum Clock/Data inputs with modulation frequencies of up to 100kHz (max.)with either center spread of 2.5% or down spread -5% deviations. POWER SOURCES SEQUENCE In typical applications, it is recommended to have VCC, LVDS VCC and PLL VCC from the same power source with three separate de-coupling bypass capacitor groups. There is no requirement on which VCC entering the device first.
3.
TRANSMITTER INPUT PINS The TxIN and control input pins are compatible with LVCMOS and LVTTL levels. These pins are not 5V tolerant. TRANSMITTER INPUT CLOCK/DATA SEQUENCING Unlike the DS90C385, DS90C(F)383A/363A, the DS90C385A does not require any special requirement for sequencing of the input clock/data and PD (PowerDown) signal. The DS90C385A offers a more robust input sequenc-
Pin Diagram for TSSOP Packages
DS90C385AMT
20070223
11
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DS90C385A
Typical Application
20070203
Truth Table
TABLE 1. Programmable Transmitter (DS90C385A) Pin R_FB R_FB Condition R_FB = VCC R_FB = GND or NC Strobe Status Rising edge strobe Falling edge strobe
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DS90C385A +3.3V Programmable LVDS Transmitter 24-bit Flat Panel Display (FPD) Link-87.5 MHz
Physical Dimensions
inches (millimeters) unless otherwise noted
56-Lead Molded Thin Shrink Small Outline Package, JEDEC Dimensions in millimeters only Order Number DS90C385AMT NS Package Number MTD56
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information visit us at www.national.com. LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ``Banned Substances'' as defined in CSP-9-111S2. Leadfree products are RoHS compliant.
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