RDA012 12 Bit 1.1 GS/s DAC
11Pages

RDA012 DATASHEET DS_0008PD1-4006 Teledyne Scientific Company reserves the right to make changes to its product specifications at any time without notice. The information furnished herein is believed to be accurate; however, no responsibility is assumed for its use. Page 1 of 11 RDA012 12 Bit 1.1 GS/s DAC Features 12 Bit Resolution 1.1 GS/s Sampling Rate 10 Bit Static Linearity 66dB SFDR with Fclk = 1.1GHz, Fout = 370MHz and 100MHz Bandwidth ECL Compatible Data Inputs Differential Analog Output Input code format: Offset Binary Output Swing: 600 mV with 50 Ù Termination to GND Differential ECL or Sinusoidal Clock Input Reference Output/Input Pin for Accurate Full-Scale Adjustment. -5.2V Power Supply 32 Lead QFP package Product Description The RDA012 is a high performance 12 Bit digital to analog converter (DAC) with a data update rate over 1.1 GS/s. Fabricated in an 80 GHz fT GaAs HBT process, the RDA012 has been optimized for ultra-high speed applications, achieving 66dB of spurious-free dynamic range (SFDR) at 1.1 GS/s, with Fout of 370MHz and 100MHz of bandwidth. The DAC utilizes a segmented current source to reduce glitch energy and to achieve high linearity performance. For better dynamic performance, the DAC outputs are internally terminated with 50Ù resistance. It outputs a nominally full-scale current of 12mA when terminated with external 50Ù resistors. Ordering information PART NUMBER DESCRIPTION RDA012-QP 12 BIT 1.1GS/s DAC, QFP Package RDA012-DI 12 BIT 1.1GS/s DAC, DIE EVRDA012-QP RDA012 Evaluation Board Figure 1- Functional Block Diagram

RDA012 DATASHEET DS_0008PD1-4006 Teledyne Scientific Company reserves the right to make changes to its product specifications at any time without notice. The information furnished herein is believed to be accurate; however, no responsibility is assumed for its use. Page 3 of 11 DC Electrical Specification Test Conditions (see notes for specific conditions): Room Temperature; VEEA = -5.2V; VEED = -5.2V; VREF = -2V; VECL = -1.3V; Clock: 1.1GHz, 0.6Vpp Differential; Outputs Terminated Into 50 Ù to 0V. PARAMETER SYMBOL CONDITIONS, NOTE MIN TYP MAX UNITS 1.0 DC TRANSFER FUNCTION 1.1 Differential...

RDA012 DATASHEET DS_0008PD1-4006 Teledyne Scientific Company reserves the right to make changes to its product specifications at any time without notice. The information furnished herein is believed to be accurate; however, no responsibility is assumed for its use. Page 4 of 11 Operating Conditions PARAMETER SYMBOL CONDITIONS, NOTE MIN TYP MAX UNITS 9.0 CLOCK INPUTS (CLKIP, CLKIN) 9.1 Amplitude VCPP 400 600 800 mV 9.2 Common Mode Voltage VCCM -0.8 -1.5 -2 V 9.3 Maximum Frequency FMAX 1100 MHz 10.0 DIGITAL INPUTS (DI<0:11>) 10.1 Input High Voltage VIH VECL = -1.3V -1.15 -0.95 -0.3 V 10.2...

RDA012 DATASHEET DS_0008PD1-4006 Teledyne Scientific Company reserves the right to make changes to its product specifications at any time without notice. The information furnished herein is believed to be accurate; however, no responsibility is assumed for its use. Page 5 of 11 Pin Description and Layout P/I/O PIN NUM. NAME FUNCTION P 19, 20, 21, 22 4 VEEA -5.2V Analog Power Supply P 13, 27 2 VEED -5.2V Digital Power Supply P 10, 16, 17, 18, 23, 24, 25 7 GND Ground P Bottom Plate - GND Ground I/O 26 1 VREF -2V Reference Voltage I 31 1 VECL Digital Input Reference I 29 1 VTT CLKI Clock...

RDA012 DATASHEET DS_0008PD1-4006 Teledyne Scientific Company reserves the right to make changes to its product specifications at any time without notice. The information furnished herein is believed to be accurate; however, no responsibility is assumed for its use. Page 6 of 11 Pad Layout Figure 3 - RDA012 pad layout. Die size is 2650 x 2740 ìm.

RDA012 DATASHEET DS_0008PD1-4006 Teledyne Scientific Company reserves the right to make changes to its product specifications at any time without notice. The information furnished herein is believed to be accurate; however, no responsibility is assumed for its use. Page 7 of 11 Theory of Operation For best dynamic and static performance, the RDA012 DAC employs 4 Bit segmentation. The ECL compatible 12 Bit digital data inputs are latched by master-slave flip-flops immediately after the input buffer to reduce the data skew. The 4 MSB data bits are decoded into thermometer code by a two-stage...

RDA012 DATASHEET DS_0008PD1-4006 Teledyne Scientific Company reserves the right to make changes to its product specifications at any time without notice. The information furnished herein is believed to be accurate; however, no responsibility is assumed for its use. Page 8 of 11 Signal Description HIGH SPEED INPUT CLOCK. The RDA012 DAC high-speed clock input is differential and can be driven from typical ECL circuits. Also a differential sinusoidal clock can be used. The CLKIP and CLKIN inputs, are internally terminated with 50Ù to VTT which should be connected to a well decoupled –2.0V...

RDA012 DATASHEET DS_0008PD1-4006 Teledyne Scientific Company reserves the right to make changes to its product specifications at any time without notice. The information furnished herein is believed to be accurate; however, no responsibility is assumed for its use. Page 9 of 11 Typical Operating Circuit Figure 8 - RDA012 typical operating circuit using the internal voltage reference.

RDA012 DATASHEET DS_0008PD1-4006 Teledyne Scientific Company reserves the right to make changes to its product specifications at any time without notice. The information furnished herein is believed to be accurate; however, no responsibility is assumed for its use. Page 10 of 11 Typical Performance Figure 9– RDA012 INL Figure 10 – RDA012 DNL Figure 11 – Spectrum at Fclk=1GHz, Fout=250MHz Figure 12 – Spectrum at Fclk=1GHz, Fout=333MHz

RDA012 DATASHEET DS_0008PD1-4006 Teledyne Scientific Company reserves the right to make changes to its product specifications at any time without notice. The information furnished herein is believed to be accurate; however, no responsibility is assumed for its use. Page 11 of 11 Package Information The package is a 32 lead metal ceramic base, glass sidewall Quad Flat Pack (QFP) with a heatsink slug on the package’s bottom. The leads are gull-winged formed. Figure 13 - RDA012-QP package, dimensions shown in inches (mm). Figure 14 - RDA012-QP footprint, dimensions shown in inches (mm).