1FEATURES

23• Pin-to-Pin Compatible to DS90C383,

DS90C383A and DS90C385

• 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.

• Support Spread Spectrum Clocking up to

100kHz Frequency Modulation and Deviations

of ±2.5% Center Spread or -5% Down Spread

• “Input Clock Detection Feature Will Pull All

LVDS Pairs to Logic Low When Input Clock is

Missing and When /PD Pin is Logic High

• 18 to 87.5 MHz Shift Clock Support

• Tx Power Consumption < 147 mW (typ) at

87.5MHz Grayscale

• Tx Power-Down Mode < 60 μW (typ)

• Supports VGA, SVGA, XGA, SXGA(Dual Pixel),

SXGA+(Dual Pixel), UXGA(Dual Pixel).

• Narrow Bus Reduces Cable Size and Cost

• Up to 2.45 Gbps Throughput

• Up to 306.25Megabyte/sec Bandwidth

• 345 mV (typ) Swing LVDS Devices for Low EMI

• PLL Requires No External Components

• Compliant to TIA/EIA-644 LVDS standard

• Low Profile 56-lead TSSOP Package

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.