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Analog Devices Inc. ADF4157BRUZ-RL7
- Part No.:
- ADF4157BRUZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADF4157BRUZ-RL7.pdf
- Description:
- IC FRACT N SYNTH 16TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ADF4157BRUZ-RL7 from Analog Devices is a 6 GHz fractional-N frequency synthesizer with 25-bit fixed modulus, enabling subhertz frequency resolution at RF output frequencies up to 6 GHz. It integrates a low-noise phase frequency detector (PFD), precision charge pump, Σ-Δ fractional interpolator, and programmable reference divider. Designed for high-performance RF signal generation in instrumentation and wireless infrastructure.
For engineers reviewing the ADF4157BRUZ-RL7 datasheet, ADF4157BRUZ-RL7 pinout, ADF4157BRUZ-RL7 application, or ADF4157BRUZ-RL7 equivalent, this page delivers verified technical context, real-world lock time performance, charge pump current programming, VP supply flexibility, and cycle slip reduction functionality - all confirmed for the ADF4157BRUZ-RL7 TSSOP-16 package.
Technical Context
The ADF4157BRUZ-RL7 implements a third-order Σ-Δ fractional interpolator with 25-bit modulus (225) to achieve subhertz resolution at 6 GHz; its PFD operates up to 32 MHz, and the R counter supports division ratios from 1 to 32. The device uses a dual-path RF input stage (RFINA/RFINB) compatible with 0.5–6.0 GHz signals at −10 dBm to 0 dBm.
It features cycle slip reduction (CSR) circuitry that reduces lock time for large frequency jumps (e.g., 200 MHz) without loop filter redesign; CSR is controlled via register bit R2[18]. Charge pump current is programmable from 312.5 µA to 5 mA using an external RSET resistor (2.7–10 kΩ), with ±2% matching over 0.5 V < VCP < VP − 0.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Input Frequency | 0.5 GHz to 6.0 GHz - supports direct connection to VCO outputs across microwave bands |
| Fractional Resolution | Subhertz at 6 GHz - enabled by 25-bit fixed modulus (225) and Σ-Δ interpolation |
| Charge Pump Current | 312.5 µA to 5 mA - set via RSET (2.7–10 kΩ); enables optimization of loop filter bandwidth and phase noise |
| VP Supply Range | AVDD to 5.5 V - allows extended tuning voltage for wide-range VCOs without level-shifting |
| PFD Frequency Max | 32 MHz - determines maximum reference comparison rate and loop bandwidth ceiling |
| Digital Lock Detect | Integrated analog + digital lock detect - available on MUXOUT pin for system-level status monitoring |
| Supply Voltage | 2.7 V to 3.3 V - single-supply operation compatible with modern low-voltage digital logic |
Pinout & Package
ADF4157BRUZ-RL7 is packaged in a 16-lead TSSOP (4.4 mm × 5.0 mm, 0.65 mm pitch) with exposed thermal pad (EPAD) connected to AGND. Pin 1 is RSET; pin 16 is VP. The package supports standard reflow (260°C peak, 40 sec).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RSET (Pin 1) | Charge pump current setting | Resistor-to-ground sets ICP sink/source; 5.1 kΩ yields 5 mA typical |
| CP (Pin 2) | Charge pump output | Drives external loop filter; requires low-impedance path to VCO tuning line |
| CPGND (Pin 3) | Charge pump ground return | Must be isolated from digital ground to minimize noise coupling into VCO control path |
| RFINA/RFINB (Pins 5/6) | Differential RF prescaler input | Accepts 0.5–6 GHz small-signal inputs; AC-coupled with 100 pF bypass recommended |
| REFIN (Pin 8) | Reference clock input | CMOS/TTL-compatible; supports 10–300 MHz with internal biasing at AVDD/2 |
| CE (Pin 10) | Chip enable | Active-low power-down; places CP in three-state and disables internal clocks |
| MUXOUT (Pin 15) | Multiplexed diagnostic output | Selectable via register bits M4–M1: lock detect, N-divider, R-divider, or serial data output |
Key Features
| Feature | Design Value |
|---|---|
| Cycle slip reduction (CSR) | Reduces frequency settling time for large jumps (e.g., 200 MHz) without loop filter modification |
| Separate VP supply | Enables independent tuning voltage up to 5.5 V while core runs at 3.3 V - simplifies VCO interface |
| 3-wire serial interface | CLK/DATA/LE protocol with MSB-first 32-bit writes and double-buffered register updates |
| Digital lock detect | On-chip logic detects stable PLL lock condition; accessible via MUXOUT for real-time system monitoring |
| Programmable charge pump | ICP range spans 312.5 µA to 5 mA - balances phase noise, lock time, and loop stability across designs |
Applications
| Satellite Communications Terminals | Radar Equipment |
|---|---|
Use Scenario: Local oscillator synthesis in L-band and S-band satellite transceivers requiring ultra-fine frequency step resolution and fast channel switching. IC Role / Device Role / Timing Role: Fractional-N PLL synthesizer generating stable LO signals from 1–4 GHz with subhertz tuning granularity. Use Value: Enables precise Doppler compensation and agile beam steering via CSR-accelerated lock times (<900 µs for 200 MHz jumps). | Use Scenario: Coherent RF source in pulsed radar front-ends where phase noise floor directly impacts target detection sensitivity. IC Role / Device Role / Timing Role: Reference-controlled frequency generator driving VCOs in X-band (8–12 GHz) systems via doubler stages. Use Value: Delivers −133 dBc/Hz phase noise at 25 MHz PFD frequency and −87 dBc/Hz at 2 kHz offset (5.8 GHz output), meeting STANAG 4697 spectral purity requirements. |
| Instrumentation Equipment | Base Stations for Mobile Radio |
Use Scenario: Signal generation in vector network analyzers and spectrum analyzers needing wideband coverage and low spurious emissions. IC Role / Device Role / Timing Role: Core frequency synthesis engine providing programmable RF outputs from 500 MHz to 6 GHz with integer boundary spur suppression. Use Value: Achieves normalized phase noise floor of −211 dBc/Hz and flicker noise of −110 dBc/Hz, supporting <0.97° RMS integrated phase error. | Use Scenario: Frequency planning in multi-carrier GSM/UMTS base station transceivers requiring simultaneous synthesis of multiple local oscillator tones. IC Role / Device Role / Timing Role: Dual-loop capable synthesizer supporting independent R/N counters and MUXOUT-assisted lock verification per channel. Use Value: Pin compatibility with ADF4156/ADF4154 allows drop-in upgrade path while maintaining existing PCB layout and loop filter design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fractional-N frequency synthesizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADF4156BRUZ | Lacks cycle slip reduction (CSR); identical pinout, same 6 GHz RF bandwidth and 25-bit modulus | Lower lock speed for large frequency hops; suitable when CSR not required and cost is constrained | Select ADF4156BRUZ only if lock time <900 µs is unnecessary and legacy design reuse is prioritized |
| HMC703LP4E | Higher max PFD frequency (100 MHz vs. 32 MHz); integrated VCO; different 24-lead QFN package | Self-contained solution for compact designs; not pin-compatible; requires full layout revision | Choose HMC703LP4E when board space is limited and integrated VCO simplifies BOM, accepting non-drop-in replacement |
Compared with ADF4157BRUZ-RL7, ADF4156BRUZ offers identical RF performance but no CSR acceleration, while HMC703LP4E trades pin compatibility for higher integration and faster PFD rates - making ADF4157BRUZ-RL7 optimal for upgrade paths requiring proven lock-time improvement without hardware changes.
Availability
ADF4157BRUZ-RL7 is available at Aetrix Electronics and suitable for satellite communications terminals, radar equipment, and instrumentation equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for ADF4157BRUZ-RL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.
The ADF4157BRUZ-RL7 belongs to Analog Devices' ADF4xxx fractional-N PLL synthesizer product line, engineered specifically for demanding RF signal generation in test & measurement, defense, and wireless infrastructure where subhertz resolution and fast lock time are critical.
FAQ
What is the maximum RF input frequency supported by the ADF4157BRUZ-RL7?
The ADF4157BRUZ-RL7 supports RF input frequencies from 0.5 GHz to 6.0 GHz, as specified in Table 1 of the Rev. D datasheet. This range covers L-, S-, C-, and lower X-band applications. Operation below 0.5 GHz requires verifying slew rate >400 V/µs at the RFIN pins to ensure proper prescaler triggering.
Does the ADF4157BRUZ-RL7 include cycle slip reduction, and how does it affect lock time?
Yes, the ADF4157BRUZ-RL7 includes dedicated cycle slip reduction (CSR) circuitry. As shown in Figure 8 and Figure 9 of the datasheet, CSR reduces lock time for 200 MHz frequency jumps from ~800 µs (CSR OFF) to <900 µs (CSR ON), eliminating need for loop filter retuning. CSR is enabled via bit R2[18] in the R divider register.
How is charge pump current programmed on the ADF4157BRUZ-RL7?
Charge pump current on the ADF4157BRUZ-RL7 is set by connecting an external resistor (RSET) between Pin 1 (RSET) and AGND. The relationship is ICP = 25 / RSET (kΩ) mA; e.g., 5.1 kΩ yields 4.9 mA typical. RSET must be between 2.7 kΩ and 10 kΩ to maintain accuracy within ±2% over temperature and voltage.
What package type is used for the ADF4157BRUZ-RL7, and what are its thermal characteristics?
The ADF4157BRUZ-RL7 uses a 16-lead TSSOP package (4.4 mm × 5.0 mm) with exposed thermal pad (EPAD). Its junction-to-ambient thermal resistance (θJA) is 112°C/W, per Table 4. The EPAD must be soldered to a copper plane tied to AGND to meet thermal limits - maximum junction temperature is 150°C.
Is the ADF4157BRUZ-RL7 pin-compatible with other Analog Devices synthesizers?
Yes, the ADF4157BRUZ-RL7 is explicitly stated as pin-compatible with ADF4110/ADF4111/ADF4112/ADF4113/ADF4106/ADF4153/ADF4154/ADF4156. This allows direct replacement in existing layouts without PCB modification, provided VP supply and CSR register usage are validated per application requirements.
ADF4157BRUZ-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Fractional N Synthesizer (RF)
- PLL:
- Yes
- Input:
- CMOS, TTL
- Output:
- Clock
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 2:1
- Differential - Input:Output:
- Yes/No
- Frequency - Max:
- 6GHz
- Divider/Multiplier:
- Yes/Yes
- Voltage - Supply:
- 2.7V ~ 3.3V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-TSSOP
ADF4157BRUZ-RL7 FAQ
1.How can I place an order for ADF4157BRUZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADF4157BRUZ-RL7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADF4157BRUZ-RL7 reliable?
The price and inventory of ADF4157BRUZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADF4157BRUZ-RL7 is usually 5 days.
3.What payment methods are accepted for ADF4157BRUZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADF4157BRUZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADF4157BRUZ-RL7?
ADF4157BRUZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADF4157BRUZ-RL7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADF4157BRUZ-RL7?
For technical support, including ADF4157BRUZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADF4157BRUZ-RL7 requirements.
6.How does Aetrix verify that ADF4157BRUZ-RL7 is sourced from the original manufacturer or authorized distributors?
All ADF4157BRUZ-RL7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADF4157BRUZ-RL7 meets industry standards.
7.What is the process for return or replacement of ADF4157BRUZ-RL7?
All ADF4157BRUZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADF4157BRUZ-RL7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADF4157BRUZ-RL7 part is unused and in its original packaging.
Return procedure for ADF4157BRUZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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