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28 Gbps, 5-Bit, Digital Time Delay with
Programmable Output Voltage Data Sheet HMC856 Rev. D Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Tel: 781.329.4700 ©2018 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com
FEATURES
Differential and single-ended operation Supports data rates up to 28 Gbps Fast rise/fall time: 20 ps/18 ps Low power consumption: 610 mW typical Programmable differential Output voltage swing: 500 mV p-p to 1350 mV p-p Single supply: −3.3 V 5 mm × 5 mm, 32-terminal ceramic leadless chip carrier (LCC) package: 25 mm2
APPLICATIONS
Broadband test and measurement equipment Frequency synthesis Matched timing FUNCTIONAL BLOCK DIAGRAM 50Ω 50Ω 50Ω 50Ω 600Ω 600Ω 600Ω600Ω 600Ω GND GND GND B0+ 7B0– 8NC NC
18 B4–
19 B4+
20 GND
21 GND
22 O– 23 O+
24 GND
10B1– 13B2– 14GND 15B3+ 16B3–
25 NIC
26 GND
27 VEE
30 VEE
31 GND
32 NIC
Figure 1. GENERAL DESCRIPTION The HMC856 is a wideband time delay device with a 5-bit digital control designed for timing compensation or clock skew management applications. The time delay provides nearly 100 ps (maximum) of delay range with 3 ps resolution and supports 28 Gbps data. The monotonic delay is compensated for stable operation over both power supply and temperature variation. All differential inputs to the HMC856 are current mode logic (CML) and terminated on chip with 50 Ω to the positive supply ground, GND, and can be ac or dc-coupled. The differential CML outputs are source terminated to 50 Ω and can also be ac or dc- coupled. Connect outputs directly to a 50 Ω ground terminated system or drive devices with CML logic input. The control lines, B4 to B0, are differential CML inputs terminated with 600 Ω to the positive rail, which supports lower power control options. The HMC856 features an output level control pin, VR, that allows loss compensation or signal level optimization. The HMC856 operates from a single −3.3 V supply and is available in a 5 mm × 5 mm LCC package.
Rev. D | Page 2 of 13 TABLE OF CONTENTS
REVISION HISTORY
6/2018—Rev. C to Rev. D This Hittite Microwave Products data sheet has been reformatted to meet the styles and standards of Analog Devices, Inc. 12/2016—Rev. 01.0611 to Rev. C Changes to Features Section, General Description Section, and
TA = 25°C, VEE = −3.3 V , VR = 0 V, unless otherwise noted.
28 Gbps input
Figure 2. Timing Diagram
Rev. D | Page 4 of 13 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Rating Power Supply Voltage (VEE) −3.75 V to +0.5 V Input Signals −2 V to +0.5 V Output Signals −1.5 V to 0.5 V Maximum Junction Temperature 125°C Continuous Power Dissipation, PDISS (T = 85°C, Derate 33 mW/°C Above 85°C) 1.33 W Thermal Resistance, θJC (Worst Case Device to Package Exposed Paddle) 30°C/W Temperature Storage −65°C to +150°C Operating −40°C to +85°C Reflow (MSL3 Rating) 260°C ESD Sensitivity Human Body Model (HBM) Class 1C Stresses at or above those listed under Absolute Maximum Ratings may cause permanent damage to the product. This is a stress rating only; functional operation of the product at these or any other conditions above those indicated in the operational section of this specification is not implied. Operation beyond the maximum operating conditions for extended periods may affect product reliability. ESD CAUTION
- NIC = NOT INTERNALLY CONNECTED.
- EXPOSED PAD. THE EXPOSED PAD MUST
Figure 3. Pin Configuration Table 3. Pin Function Descriptions 2, 3 I+, I− Differential Data Inputs. CML referenced to positive supply. Differential Digital Control Inputs. CML referenced to positive supply. be connected to radio frequency (RF)/dc ground without affecting performance. (RF)/dc ground without affecting performance. 22, 23 O−, O+ Differential Data Outputs. CML referenced to positive supply, 50 Ω termination. to the negative voltage supply. applying voltage to VR, as shown in Figure 12. 29 VB DC Bias Voltage. VB must be connected to ground. EPAD (VEE) Exposed Pad. The exposed pad must be connected to the negative voltage supply.
Rev. D | Page 10 of 13 THEORY OF OPERATION The HMC856 is a wideband time delay device with a 5-bit digital control designed for timing compensation or clock skew management applications. The HMC856 operates from a single −3.3 V supply and is available in a 5 mm × 5 mm LCC package. The HMC856 can support data rates up to 28 Gbps and is able to provide 100 ps variable delay with 3 ps resolution. The total propagation delay of the HMC856 varies between 250 ps and 350 ps. The maximum achievable bandwidth of the HMC856 depends on the power of the input signal. The highest bandwidth of the device is at the larger input power levels, as shown in Figure 23. The HMC856 uses a CML interface, which uses 50 Ω internal terminations to the ground. The input and output pins can be interfaced with either ac or dc coupling. For ac coupling, using a series resistor, which is effectively short circuit, and an ac load of 50 Ω is recommended. For dc coupling, inputs and outputs can be directly interfaced with another CML circuit. The control lines, B4 to B0, are also CML, but they are terminated with 600 Ω to the positive rail for low power operation. The HMC856 features an output level control pin, VR, that allows loss compensation or signal level optimization. VR can have a voltage value between −1.2 V and 0.4 V, which results in a differential output swing of 500 mV p-p and 1350 mV p-p. Increasing the output swing affects the rise and fall times. As VR becomes higher, the rise and fall times increase. Changing the VR pin also changes the power dissipation because the HMC856 can consume between 140 mA and 200 mA at room temperature depending on the VR pin.
Table 4. Bill of Materials for the Evaluation PCB 127102- the complete evaluation PCB. 2 Use Arlon 25FR or Rogers 4350 for circuit board material. Figure 24. Evaluation Board Layout, Top Side
Figure 25. Typical Application Circuit
Figure 26. 32-Terminal Ceramic Leadless Chip Carrier [LCC] 1 All models are RoHS compliant parts. 2 See the Absolute Maximum Ratings section. registered trademarks are the property of their respective owners.