DAC2900-EVM

DAC290x-EVM SBAU071B – JUNE 2001 – REVISED SEPTEMBER 2005 FEATURES DESCRIPTION ● POPULATED EVALUATION BOARD FOR THE DUAL, HIGH-SPEED DAC290x The DAC290x-EVM is designed for ease of use in evaluating the DAC290x dual, high-speed Digital-to-Analog Converter (DAC) family. This family consists of three 125MSPS DACs: the 10-bit DAC2900, the 12-bit DAC2902, and the 14-bit DAC2904. Due to its flexible design, the user can evaluate the converter with different clock configurations, independent bias control, internal or external reference source, and single- or dual-supply operation. The analog output of the DAC290x DACs can be configured to drive a 50Ω terminated cable using a single-ended, or 4:1 or 1:1 impedance ratio transformer. ● PROVIDES FAST AND EASY PERFORMANCE TESTING FOR THE DAC290x ● SINGLE-ENDED OR TRANSFORMER-COUPLED DIFFERENTIAL OUTPUTS ● SINGLE CLOCK INPUT CONFIGURATION ● ADJUSTABLE BIAS Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. Copyright © 2001-2005, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. www.ti.com INITIAL CONFIGURATION INTERNAL REFERENCE OPERATION By using jumpers and 0Ω resistors, the DAC290x-EVM can be set up in a variety of configurations to accommodate a specific mode of operation. Before starting evaluation, the user should decide on the configuration and make the appropriate connections or changes. The demonstration board comes with the following factory-set configuration: The full-scale output current is set by applying an external resistor (R15 and R16) between the FAS1 and FAS2 pins of the DAC290x and ground. The full-scale output current can be adjusted from 20mA down to 2mA by varying R15 and R16 or changing the externally applied reference voltage. The full-scale output current, IOUTFS, is defined as follows: • Single clock source driving CLK_1, WRT_1, CLK_2, and WRT_2 from WRT_1 input J5. W10, R21, R32-R37, and J6-J8 not installed. IOUTFS = 32 • (VREF_IN/RBIAS) • Transformer coupled outputs (1:1) using transformer T1 and T2. R43-R46, C12, C13, C22, and C23 not installed. Note that a dc-bias voltage is set at the center tap. • The converter is set to operate with the internal reference. Jumper W1 is not installed. • The full-scale output current of both DACs is set to 20mA through the FSA resistors R15 and R16 (2kΩ each). Jumper W2 is installed connecting pin 42 (GSET) to ground. • The DAC290x output is enabled (power-down mode disabled). Jumper W6 is installed connecting pin 37 (PD) to ground. POWER SUPPLY The DAC290x converter requires two power supplies—an analog and a digital supply. Each of the supplies may be set independently between +3.0V and +5.0V. The analog supply, +VA, must be connected at banana jack J9 with the return going to banana jack J10. The digital supply, +VD, connects at banana jack J11 with the return connected to J12. When operating the DAC290x with a +3.0V digital supply, care must be taken that the amplitude of the digital data inputs has a corresponding logic level. The logic high level must not exceed the power supply by more than 0.3V. Refer to the product data sheets (DAC2900—SBAS166; DAC2902—SBAS167; DAC2904—SBAS198) for further details. All analog and digital power, and grounds are distributed by the use of power planes. where VREF_IN is the voltage at pin REF_IN and RBIAS is the resistance of R15 (for DAC1) or R16 (for DAC2). This voltage is typically +1.25V when using the internally provided reference voltage source. Two potentiometers (R40 and R41) are provided to allow the user to adjust the center voltage of the DAC outputs across transformers T1 and T2. The EVM initial setup is for full-scale output current operation, with the potentiometers adjusted to provide 0.5V at the center tap of the transformers. EXTERNAL REFERENCE OPERATION The internal reference can be disabled and overridden by an external reference. Two methods of external reference are provided by the EVM. The user can provide an external reference by connecting a voltage source to SMA connector J13 with Jumper W1 installed between pins 2 and 3. In addition, a reference circuit has been included on the EVM to provide a second external reference source. This source is available by placing Jumper W1 between pins 1 and 2 and adjusting potentiometer R7 to the desired voltage. The range of this circuit is from 0V to 1.25V. The specified range for external reference voltages should never exceed the limits as specified per the data sheet. POWER-DOWN MODE The DAC290x-EVM provides a means of placing the DAC290x converter into a power-down mode. This mode is activated by re-configuring Jumper W6 so that it connects the PD-pin (pin 37) to +VD. INPUT DATA INPUT CLOCK The DAC290x-EVM default configuration requires only one clock input. The clock should be applied via SMA connector WRT_1 (J5), which provides a 50Ω terminated input. It is recommended to use a square wave clock with an amplitude of ≥ 3.0Vp-p. In order to preserve the specified performance of the DAC290x converter, the clock source should feature very low jitter. The DAC290x-EVM allows the user to input I and Q digital data to the DAC using J1 and J2. The board provides series dampening 22Ω resistors and buffering to minimize digital ringing and switching noise. The connectors also provide a path for an input clock. With the EVM set up in the single clock source mode, the user can provide a clock through J1 or J2 by installing jumper W10 and resistor R21. The 14-bit input data buses are brought in through two 34-pin headers as shown in Tables I and II. MULTIPLE INPUT CLOCKS The DAC290x-EVM evaluation board can be configured for multiple input clocks, each driving a CLK or WRT input pin. This mode would require the user to install J6, J7, J8, R32 through R37, and removal of R22 through R25. 2 DAC290x-EVM SBAU071B J1 PIN # DESCRIPTION J1 PIN # DESCRIPTION J2 PIN # DESCRIPTION J2 PIN # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Data Bit 13 (MSB) GND Data Bit 12 GND Data Bit 11 GND Data Bit 10 GND Data Bit 9 GND Data Bit 8 GND Data Bit 7 GND Data Bit 6 GND Data Bit 5 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 GND Data Bit GND Data Bit 3 GND Data Bit 2 GND Data Bit 1 GND Data Bit 0 GND Open GND Open GND CLK1 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Data Bit 13 (MSB) GND Data Bit 12 GND Data Bit 11 GND Data Bit 10 GND Data Bit 9 GND Data Bit 8 GND Data Bit 7 GND Data Bit 6 GND Data Bit 5 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 TABLE I. Input Connector J1—Data Port 1. GND Data Bit GND Data Bit GND Data Bit GND Data Bit GND Data Bit GND Open GND Open GND CLK2 GND 4 3 2 1 0 TABLE II. Input Connector J2—Data Port 2. VALUE FOOTPRINT QTY PART NUMBER VENDOR REF DESIGNATOR 47µF, Tantalum, 10%, 10V Cap 0.1µF, 100V, 10% Capacitor 0.1µF,16V, 10% Capacitor 10µF, 10V, 10% Capacitor 0.01µF, 100V, 5% Capacitor 1.0µF, 16V, 10% Capacitor 22pF, 50V, 5%, Capacitor Ferrite Bead 24.9Ω Resistor, 1/16W, 1% 22.1Ω Resistor, 1/16W, 1% 49.9Ω Resistor, 1/16W, 1% 2.0KΩ Resistor, 1/8W, 1% 1.0KΩ Resistor, 1/8W, 1% 100Ω Resistor, 1/4W, 1% 0Ω Resistor, 1/16W, 1% 7343 805 603 3528 805 1206 603 27—037447 603 603 603 805 805 805 603 2 3 7 3 2 2 0 2 2 2 5 2 2 2 5 10TPA47M 08055C104JAT2A ECJ-1VB1C104K GRM42X5R106K10 12065C103KAT2A 1206ZC105KAT2A 06035A220JAT2A #27-037447 ERJ-3EKF24R9V ERJ-3EKF22R1V ERJ-3EKF49R9V CRCW08052001F CRCW08051001F CRCW08051000F ERJ-3EKF0R00V SANYO AVX Panasonic Murata AVX AVX AVX FairRite Panasonic Panasonic Panasonic Dale Dale Dale Panasonic C30 C36 C6 C28 C34 C7 C11 C14 C19 C20 C21 C24 C5 C26 C32 C29 C35 C27 C33 1206 BOURNS_32X4W MC_KK81 SMA_Jack Test_Point 3-Pos_Jumper NA 34-Pin Header BANANA_JACK BANANA_JACK 48-TQFP(PFB) 8-SOP(D) 2NBS16 8-MSOP(DGK) 4-40 Screw 4 3 2 4 3 5 0 2 2 2 1 1 4 1 4 0Ω Resistor, 1/10W, 1% 500Ω Pot Transformer SMA Connectors Black Test Point 3-Pos_Header 2 Circuit Jumpers 34-Pin Header Red Banana Jacks Black Banana Jacks DAC29XX LT1004D-1.2 22Ω R-Pack TLV2462 Stand Off Hex (1/4 x 1 inch) DESCRIPTION ERJ-6ENF0R00V Panasonic 3214W-501ECT Bourns T1-1T-KK8 Mini-Circuits 713-4339 (901-144-8RFX) ALLIED 5001K Keystone TSW-150-07-L-S Samtec 863-3285 Allied(molex) TSW-117-07-L-D Samtec ST-351A ALLIED ST351B ALLIED DAC2900/02/04Y TI LT1004ID-1-2 TI 4816P-001-220 Bourns TLV2462CDGK TI 219-2063 Allied NOT INSTALLED C12 C13 C22 C23 FB1 FB2 R20 R30 R14 R31 R17 R18 R27 R28 R38 R15 R16 R5 R9 R19 R29 R22 R23 R24 R25 R26 R10 R11 R12 R13 R7 R40 R41 T1 T2 J3 J4 J5 J13 TP1 TP2 TP3 W1 W2 W5 W6 W10 R32, R34, R36 R21 R33 R35 R37 R43 R44 R45 R46 J14 J15 J16 J17 J6 J7 J8 J1 J2 J9 J11 J10 J12 U5 U2 R1 R2 R3 R4 U4 TABLE III. DAC290x-EVM Parts List. DAC290x-EVM SBAU071B 3 FIGURE 1. DAC290x-EVM Circuit Schematic #1. 33 31 29 27 25 23 21 19 17 15 13 11 9 7 5 3 1 NOTES: 33 31 29 27 25 23 21 19 17 15 13 11 9 7 5 3 1 22 R31 D0_2 D1_2 D2_2 D3_2 D4_2 D5_2 D6_2 D7_2 D8_2 D9_2 D10_2 D11_2 D12_2 D13_2 D0_1 D1_1 D2_1 D3_1 D4_1 D5_1 D6_1 D7_1 D8_1 D9_1 D10_1 D11_1 D12_1 D13_1 22 Ohms R1 CLK1 CLK2 R4 22 Ohms R3 22 Ohms R2 22 Ohms 22 1. PART NOT INSTALLED 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 DATA PORT 2 J2 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 DATA PORT 1 R14 BD0_2 BD1_2 BD2_2 BD3_2 BD4_2 BD5_2 BD6_2 BD7_2 BD8_2 BD9_2 BD10_2 BD11_2 BD12_2 BD13_2 BD0_1 BD1_1 BD2_1 BD3_1 BD4_1 BD5_1 BD6_1 BD7_1 BD8_1 BD9_1 BD10_1 BD11_1 BD12_1 BD13_1 U2 LT1004D-1.2 1K 500 R7 6 5 7 8 CLK2 CLK1 1 C21 2 W10 C6 BD1_1 BD0_1 WRT_1 J5 0.1uF DVDD C20 0.1uF J13 SMA W5 2 2 W2 AVDD U5 DAC290x 1 0 Ohm (Note 1) FSA1 BD12_2 BD13_2 BD0_2 BD1_2 BD2_2 BD3_2 BD4_2 BD5_2 BD6_2 BD7_2 BD8_2 BD9_2 BD10_2 BD11_2 1 0 Ohm R25 (Note 1) WRT_2 J8 (Note 1) 0 Ohm R35 49.9 R36 (Note 1) WRT_2 36 35 34 33 32 31 30 29 28 27 26 25 1 2K R16 (Note 1) 0 Ohm 49.9 R38 FSA2 R37 POWER DOWN W6 DVDD 2K R15 D0_2 D1_2 D2_2 D3_2 D4_2 D5_2 D6_2 D7_2 D8_2 D9_2 D10_2 D11_2 2 (Note 1) CLK_2 J7 0 Ohm R24 0 Ohm R33 49.9 R34 (Note 1) CLK_2 R26 (Note 1) CLK_1 J6 0 Ohm R23 49.9 (Note 1) R32 WRT_1 D13_1 D12_1 D11_1 D10_1 D9_1 D8_1 D7_1 D6_1 D5_1 D4_1 D3_1 D2_1 0 Ohm 1 3 0.1uF C7 R22 BD13_1 1 BD12_1 2 BD11_1 3 BD10_1 4 BD9_1 5 BD8_1 6 BD7_1 7 BD6_1 8 BD5_1 9 BD4_1 10 BD3_1 11 BD2_1 12 0.1uF C11 AVDD 1 W1 EXTIO (0-1.25V) .1uF C19 1K R9 0 Ohm (Note 1) R21 DVDD .1uF AVDD TLV2462D U4A TLV2462D U4B NOT USED 10uF + C5 2 3 2 AVDD 1 3 4 1 3 2 3 4 5 R5 5 4 3 2 CLK_1 5 4 3 2 1 3 1 3 48 47 46 45 44 43 42 41 40 39 38 37 N/C +VA IOUT1 IOUT1 FSA1 REF_IN GSET FSA2 IOUT2 IOUT2 AGND PD D1_1 D0_1 DGND +VD WRT_1 CLK_1 CLK_2 WRT_2 DGND +VD D13_2 D12_2 13 14 15 16 17 18 19 20 21 22 23 24 5 4 3 2 J1 AVDD 5 4 3 2 R27 49.9 49.9 R17 R19 100 22 pF (Note 1) C13 R30 24.9 22pF (Note 1) C23 100 R29 500 R41 AVDD R18 49.9 R28 49.9 22pF (Note 1) C22 (Note 1) 22 pF C12 500 R40 AVDD 0 Ohm 0 Ohm R13 0 Ohm R12 0 Ohm R11 R10 R20 24.9 SMA T1 6 1 .1uF C24 R46 0 Ohm (Note 1) 1 1 2 3 (Note 1) R43 0 Ohm .1uF C14 1 T2 1 6 SMA (Note 1) J17 T1-1T-KK81 4 (Note 1) J16 SMA 3 4 T1-1T-KK81 R45 J15 0 Ohm SMA (Note 1) (Note 1) 1 2 1 0 Ohm R44 (Note 1) 1 (Note 1) J14 2 3 4 5 2 3 4 5 2 3 4 5 2 3 4 5 J3 IOUT2 J4 IOUT1 2 3 4 5 2 3 4 5 4 DAC290x-EVM SBAU071B FIGURE 2. DAC290x-EVM Circuit Schematic #2. DAC290x-EVM SBAU071B 5 J10 TP1 BLACK J12 BLACK RED J11 +VD BLACK RED J9 +VA VD TP2 BLACK VA 1uF TP3 BLACK C33 10uF FB2 C35 0.1uF 0.01uF C34 + C30 47 uF + C36 47 uF DVDD 0.1uF 0.01uF C29 C28 1uF AVDD C27 + C32 10uF + C26 FB1 FIGURE 3. Top Layer with Silkscreen. FIGURE 4. Ground Plane. 6 DAC290x-EVM SBAU071B FIGURE 5. Power Plane. FIGURE 6. Bottom Layer with Silkscreen. DAC290x-EVM SBAU071B 7 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. 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