629LP4E

HMC629LP4 / 629LP4E v07.0410 3 dB LSB GaAs MMIC 4-BIT DIGITAL ATTENUATOR, DC - 6 GHz Features 3 dB LSB Steps to 45 dB Power-Up State Selection Low Insertion Loss: 2.5 dB TTL/CMOS Compatible, Serial, Parallel or Latched Parallel Control ±0.25 dB Typical Step Error Single +3V or +5V Supply 24 Lead 4x4mm SMT Package: 16mm2 8 ATTENUATORS - DIGITAL - SMT Typical Applications The HMC629LP4(E) is ideal for: • Cellular/3G Infrastructure • WiBro / WiMAX / 4G • Microwave Radio & VSAT • Test Equipment and Sensors • IF & RF Applications Functional Diagram General Description The HMC629LP4(E) is a broadband 4-bit GaAs IC Digital Attenuator in a low cost leadless SMT package. This versatile digital attenuator incorporates off-chip AC ground capacitors for near DC operation, making it suitable for a wide variety of RF and IF applications. The dual mode control interface is CMOS/TTL compatible, and accepts either a three wire serial input or a 4-bit parallel word. For applications which require only 33 dB of attenuation range, the HMC629LP4(E) provides excellent attenuation accuracy up to 10 GHz. The HMC629LP4(E) is housed in a RoHS compliant 4x4 mm QFN leadless package, and requires no external matching components. Electrical Specifications, Parameter Insertion Loss Attenuation Range TA = +25° C, 50 Ohm System, with Vdd = +5V & Vctl = 0/+5V (Unless Otherwise Noted) Frequency (GHz) DC - 6 DC - 6 DC - 6 Min. Typ. 2.5 45 17 ± (0.50 + 5% of Atten. Setting) Max. Max. 5 Units dB dB dB dB dB dB Return Loss (ATTIN, ATTOUT, All Atten. States) Attenuation Accuracy: (Referenced to Insertion Loss) All Attenuation States 8-1 F or price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com Application Support: Phone: 978-250-3343 or apps@hittite.com HMC629LP4 / 629LP4E v07.0410 3 dB LSB GaAs MMIC 4-BIT DIGITAL ATTENUATOR, DC - 6 GHz Insertion Loss vs. Temperature 0 NORMALIZED ATTENUATION (dB) Normalized Attenuation 0 -10 -20 -30 -40 -50 -60 (Only Major States are Shown) 8 ATTENUATORS - DIGITAL - SMT 8-2 INSERTION LOSS (dB) -5 -10 +25 C +85 C -40 C -15 -20 0 2 4 6 8 10 FREQUENCY (GHz) 0 2 4 6 8 10 FREQUENCY (GHz) Input Return Loss 0 -5 RETURN LOSS (dB) (Only Major States are Shown) Output Return Loss 0 -5 RETURN LOSS (dB) -10 -15 -20 -25 -30 -35 -40 (Only Major States are Shown) -10 -15 -20 -25 -30 -35 -40 0 2 4 6 8 10 FREQUENCY (GHz) 0 2 4 6 8 10 FREQUENCY (GHz) Bit Error vs. Attenuation State 10 8 6 BIT ERROR (dB) 4 2 0 -2 -4 -6 -8 -10 0 5 10 15 20 25 30 35 40 45 ATTENUATION STATE (dB) (7, 8, 10) GHz (1, 2, 4, 5) GHz Bit Error vs. Frequency 6 4 BIT ERROR (dB) 2 0 -2 -4 (Only Major States are Shown) BIT 24 ALL BITS -6 0 2 4 6 8 10 FREQUENCY (GHz) F or price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com Application Support: Phone: 978-250-3343 or apps@hittite.com HMC629LP4 / 629LP4E v07.0410 3 dB LSB GaAs MMIC 4-BIT DIGITAL ATTENUATOR, DC - 6 GHz 8 ATTENUATORS - DIGITAL - SMT Step Error vs. Frequency (Only Major States are Shown) 2 1.5 STEP ERROR (dB) 1 0.5 0 -0.5 -1 BIT 24 ALL BITS BIT (3, 6, 12) Normal Relative Phase vs. Frequency 100 80 RELATIVE PHASE (deg) 60 40 20 0 -20 -40 -60 -80 -100 (3, 6, 12) dB 45 dB 24 dB -1.5 -2 0 2 4 6 8 10 FREQUENCY (GHz) 0 1 2 3 4 5 6 7 8 9 10 FREQUENCY (GHz) Serial Control Interface The HMC629LP4E contains a 3-wire SPI compatible digital interface (SERIN, CLK, LE). The serial control interface is activated when P/S is kept high. The 6-bit serial word must be loaded MSB first. The positive-edge sensitive CLK and LE requires clean transitions. If mechanical switches are used, sufficient debouncing should be provided. When LE is high, 4-bit data in the serial input register is transferred to the attenuator. When LE is high CLK is masked to prevent data transition during output loading. When P/S is low, 3-wire SPI interface inputs (SERIN, CLK, LE) are disabled and the input register is loaded with parallel digital inputs (D0-D5). When LE is high, 4-bit parallel data changes the state of the part per truth table. For all modes of operations, the state will stay constant while LE is kept low. 8-3 F or price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com Application Support: Phone: 978-250-3343 or apps@hittite.com HMC629LP4 / 629LP4E v07.0410 3 dB LSB GaAs MMIC 4-BIT DIGITAL ATTENUATOR, DC - 6 GHz Parameter Min. serial period, tSCK Control set-up time, tCS Control hold-time, tCH LE setup-time, tLN Min. LE pulse width, tLEW Min LE pulse spacing, tLES Serial clock hold-time from LE, tCKN Hold Time, tPH. Latch Enable Minimum Width, tLEN Setup Time, tPS Typ. 100 ns 20 ns 20 ns 10 ns 10 ns 630 ns 10 ns 0 ns 10 ns 2 ns Timing Diagram (Latched Parallel Mode) 8 ATTENUATORS - DIGITAL - SMT 8-4 Parallel Mode (Direct Parallel Mode & Latched Parallel Mode) Note: The parallel mode is enabled when P/S is set to low. Direct Parallel Mode - The attenuation state is changed by the Control Voltage Inputs directly. The LE (Latch Enable) must be at a logic high to control the attenuator in this manner. Latched Parallel Mode - The attenuation state is selected using the Control Voltage Inputs and set while the LE is in the Low state. The attenuator will not change state while LE is Low. Once all Control Voltage Inputs are at the desired states the LE is pulsed. See timing diagram below for reference. Power-Up States If LE is set to logic LOW at power-up, the logic state of PUP1 and PUP2 determines the power-up state of the part per PUP truth table. If the LE is set to logic HIGH at power-up, the logic state of D3-D0 determines the power-up state of the part per truth table. The attenuator latches in the desired power-up state approximately 200 ms after power-up. PUP Truth Table LE 0 0 0 0 1 PUP1 0 1 0 1 X PUP2 0 0 1 1 X Attenuation State 45 dB 45 dB 45 dB Insertion Loss 0 to 45 dB Power-On Sequence The ideal power-up sequence is: GND, Vdd, digital inputs, RF inputs. The relative order of the digital inputs are not important as long as they are powered after Vdd / GND Note: Power-Up with LE= 1 provides direct parallel operation with D0 - D3. Truth Table Control Voltage Input D3 High High High High Low D2 High High High Low High D1 High High Low High High D0 High Low High High High Attenuation State Reference I.L. 3 dB 6 dB 12 dB 24 dB Bias Voltage Vdd (Vdc) 5 Idd (Typ.) (mA) 2.0 Control Voltage Table State Low High Vdd = +3V 0 to 0.5V @