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AD9850 DDS Synthesizer: Comprehensive Guide to Pinout, Schematic, and Datasheet

The AD9850 is a powerful CMOS-based 125 MHz Direct Digital Synthesis (DDS) device designed for versatile frequency synthesis and precise clock generation. Its advanced digital structure allows fine control over frequency and phase, making it basic in applications ranging from amateur radio to commercial communications. This article explores the AD9850’s pin configuration, technical specifications, and practical applications, highlighting its impact on modern systems requiring high precision and flexibility. Through its low power consumption, adaptability, and reliable performance, the AD9850 continues to be a basis in the design of high-performance frequency control systems.

Catalog

Overview of AD9850

The AD9850 is a sophisticated digital synthesizer that merges Direct Digital Synthesis (DDS) with a high-speed digital-to-analog converter and comparator. This combination enables the creation of precise analog sine waves, offering a versatile source for generating frequencies and synthesizing clocks. With a tuning resolution of 0.0291 Hz, it can handle up to 23 million frequency updates per second, supporting output frequencies as high as 62.5 MHz. Its ability to deliver such precision may invoke feelings of accomplishment for those working on intricate frequency applications.

Equipped with five-phase modulation capabilities, the device allows for complex signal manipulation. This adaptability in phase control proves beneficial in communication and instrumentation tasks where timing precision shapes outcomes. Field settings often reveal their resilience, maintaining consistent performance across varied conditions, a trait that can resonate with a sense of dependability.

The AD9850 employs a low-power CMOS design, functioning efficiently within industrial temperature parameters. It consumes only 155 mW at a 3.3 V supply, making it ideal for battery-operated and portable applications while sustaining performance. In contexts where energy conservation aligns with broader goals, its design offers a sense of harmony between performance and sustainability. The synthesizer supports both parallel and serial data loading methods, expanding its applicability across different system configurations. This adaptability promotes diverse deployment strategies, enabling customized solutions in sophisticated systems. Actual scenarios emphasize its smooth integration into both legacy and cutting-edge technologies, reinforcing its standing in the field.

Pin Configuration

Pin No.	Mnemonic	Function
4 to 1, 28 to 25	D0 to D7	8-Bit Data Input. This is the 8-bit data port for iteratively loading the 32-bit frequency and the 8-bit phase/control word. D7 = MSB; D0 = LSB. D7 (Pin 25) also serves as the input pin for the 40-bit serial data-word.
5, 24	DGND	Digital Ground. These are the ground return leads for the digital circuitry.
6, 23	DVDD	Supply Voltage Leads for Digital Circuitry.
7	W_CLK	Word Load Clock. This clock is used to load the parallel or serial frequency/phase/control words.
8	FQ_UD	Frequency Update. On the rising edge of this clock, the DDS updates to the frequency (or phase) loaded in the data input register; it then resets the pointer to Word 0.
9	CLKIN	Reference Clock Input. This may be a continuous CMOS-level pulse train or sine input biased at 1/2V supply. The rising edge of this clock initiates operation.
10, 19	AGND	Analog Ground. These leads are the ground return for the analog circuitry (DAC and comparator).
11, 18	AVDD	Supply Voltage for the Analog Circuitry (DAC and Comparator).
12	RSET	DAC's External RSET Connection. This resistor value sets the DAC full-scale output current. For normal applications (FS, IOUT = 10 mA), the value for RSET is 3.9 kΩ connected to ground. The RSET/IOUT relationship is IOUT = 32 (1.248 V/RSET).
13	QOUTB	Output Complement. This is the comparator’s complement output.
14	QOUT	Output True. This is the comparator’s true output.
15	VINN	Inverting Voltage Input. This is the comparator’s negative input.
16	VINP	Noninverting Voltage Input. This is the comparator’s positive input.
17	DACBL (NC)	DAC Baseline. This is the DAC baseline voltage reference; this lead is internally bypassed and should normally be considered a no connect for optimum performance.
20	IOUTB	Complementary Analog Output of the DAC.
21	IOUT	Analog Current Output of the DAC.
22	RESET	Reset. This is the master reset function; when set high, it clears all registers (except the input register), and the DAC output goes to cosine 0 after additional clock cycles.

CAD Model of AD9850

Symbol

Footprint

Features

Feature	Description
Clock Frequency	25 MHz
On-Chip DAC and Comparators	High-performance DAC and high-speed comparators
DAC SFDR	> 50 dB @ 40 MHz AOUT
Frequency Tuning	32-bit frequency tuning word
Control Interface	Simplified control interface: parallel byte or serial
Loading Format	Supported
Phase Modulation	Phase modulation capability
Power Supply	Operates on a 3.3V or 5V single power supply
Power Consumption (5V)	380 mW @ 125 MHz
Power Consumption (3.3V)	155 mW @ 110 MHz
Power Down	Power down function included
Package Type	Ultra-small 28-pin SSOP package

Technical Specification

Here is a structured table format based on the technical specifications, attributes, and parameters provided for the Analog Devices Inc. AD9850BRS, along with its part details.

Parameter	Value
Type	DSP Peripheral, Numeric Controlled Oscillator
Lifecycle Status	Production (Last Updated: 3 weeks ago)
Factory Lead Time	8 Weeks
Contact Plating	Lead, Tin
Mounting Type	Surface Mount
Package / Case	28-SSOP (0.209, 5.30mm Width)
Number of Pins	28
Operating Temperature	-40°C to 85°C
Packaging	Tube
JESD-609 Code	e0
Pbfree Code	No
Part Status	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Number of Terminations	28
ECCN Code	EAR99
Max Power Dissipation	480mW
Voltage - Supply	3.3V, 5V
Terminal Position	Dual
Terminal Form	Gull Wing
Peak Reflow Temperature	240°C
Supply Voltage	5V
Terminal Pitch	0.65mm
Reach Compliance Code	Not Compliant
Frequency	125MHz
Time at Peak Reflow Temperature	20 seconds
Base Part Number	AD9850
Pin Count	28
Number of Outputs	1
Qualification Status	Not Qualified
Operating Supply Voltage	3.3V
Operating Supply Current	96mA
Nominal Supply Current	96mA
Power Dissipation	480mW
Max Supply Current	96mA
uPs/uCs/Peripheral ICs Type	DSP Peripheral, Numeric Controlled Oscillator
Number of Bits	10
Logic Function	Clock
Power Consumption	380mW
Boundary Scan	No
Low Power Mode	Yes
Conversion Rate	125 Msps
Resolution (Bits)	10 b
Tuning Word Width (Bits)	32b
Length	10.2mm
Width	5.3mm
RoHS Status	Non-RoHS Compliant
Lead Free	Contains Lead

Electronical Schematic

Alternatives

Attribute	AD9850BRS (Rochester Electronics LLC)	AD9850BRSZ (Analog Devices Inc)
RoHS Code	No	Yes
IHS Manufacturer	Rochester Electronics Inc	Analog Devices Inc
Reach Compliance Code	Unknown	Compliant
JESD-609 Code	e0	e3
Peak Reflow Temperature (°C)	240	260
Qualification Status	Commercial	Not Qualified
Terminal Finish	Tin Lead	Matte Tin (Sn)
Base Number Matches	4	2
Source Content uid	AD9850BRS	AD9850BRSZ
Manufacturer Package Code	RS-28	RS-28
ECCN Code	EAR99	EAR99
HTS Code	8542.39.00.01	8542.39.00.01
Samacsys Description	AD9850BRS	AD9850BRSZ, Direct Digital Synthesizer 10 bit Bit 1250000ksps, 28-Pin SSOP
Samacsys Manufacturer	Rochester Electronics LLC	Analog Devices Inc

AD9850 Evaluation Board

Functional Block Diagram

Applications of AD9850

Sine Wave Synthesis and Flexibility

The AD9850 showcases its prowess in crafting precise sine waves with adaptable frequency and phase control. Its ability to smoothly adjust frequencies becomes a harmonious factor in varied testing and measurement settings, spanning research and commercial use. The elegance of swift phase modifications assists in enhancing signal coherence and diminishing phase noise, thereby reinforcing signal integrity in intricate systems.

Digital Clock Synchronization

With its precise timing capabilities, digital clock recovery finds a valuable partner in the AD9850. It seamlessly extracts timing details from data streams, ensuring synchronization. This proves mostly beneficial in telecommunications, where preserving data fidelity during transmission evokes trust. Actual applications demand agility to accommodate various data rates, and the AD9850's adaptability curtails errors from timing mismatches.

Enhancements in Communication Systems

Within communication systems, the AD9850 makes remarkable contributions by refining modulation and demodulation processes. Its stable frequency generation supports efficient data exchange. This device is often employed to boost signal clarity, fend off interference, and accommodate diverse communication protocols, ultimately transforming communication networks with enhanced signal quality and range.

Digital Precision in ADC Code Generation

Employing the AD9850 for digitally controlled ADC code generation highlights its precision in translating analog signals to digital codes. It plays a serious role in data acquisition systems demanding accurate digital signal representation. The reliability and accuracy of the AD9850 facilitate high resolution and faithful conversion of rapidly fluctuating signals, solidifying its role in high-precision arenas.

Agile Local Oscillator Uses

As an agile local oscillator, the AD9850 supports endeavors that require rapid frequency changes and stability, such as radars and testing instruments. Utilizing the AD9850 can elevate system performance, enabling swift adaptations to evolving conditions and preserving system precision over time, thus paving the way for technical innovations that stand the course.

Manufacturer

Analog Devices, Inc. (ADI), renowned for its inventive prowess in analog and mixed-signal advancements since 1965, has consistently positioned itself as a leader in electronic signal conversion. Its components play a major role in connecting the physical and digital worlds, reaching over 100,000 customers worldwide. These products transform sound, light, motion, and temperature into electrical signals, enriching the capabilities of myriad electronic devices. ADI's advanced technology permeates diverse sectors in telecommunications, healthcare, automotive, and consumer electronics.

Datasheet PDF

AD9850BRS Datasheets:

AD9850.pdf

AD9850BRSZ Datasheets:

AD9850.pdf

Frequently Asked Questions [FAQ]

1. Can the AD9850/1 be employed for radio transmission?

The AD9850 proves to be a compelling choice for constructing a low-power transmitter. It facilitates short to moderate-range transmissions using Frequency Shift Keying (FSK) modulation. In actual scenarios, you can harness its precision in amateur radio projects, carefully optimizing signal clarity and reliability within chosen frequency bands.

2. Which waveforms is the AD9850 capable of generating?

The AD9850 is adept at producing various waveforms like sine, square, and triangle. Utilizing its direct digital synthesis (DDS) abilities, you can intricately adjust these waveforms to meet different electronic experimental needs, highlighting this technology's adaptability in waveform creation.

3. How does the AD9850BRS differ from the AD9850?

The AD9850BRS model distinguishes itself with unique features concerning temperature range and packaging. These differences cater to applications where environmental factors require specific durability, ensuring sustained performance and longevity in diverse operational contexts.

4. For waveform generation, should one choose the MAX038 or the AD9850?

Choosing between the MAX038 and the AD9850 hinges on the specific needs of the application. Insights from highlight digital synthesis (AD9850) or an analog method (MAX038) are based on factors like precision, scalability, and ease of integration. Many find that digital pathways often provide enhanced adaptability for contemporary applications.

5. What is the AD9850 package in PROTEL?

In PROTEL, the AD9850 is offered in a DIP28 package. This format is appreciated for its accessibility in prototyping and educational settings, enabling streamlined assembly and testing in a variety of hardware and software development environments.