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NXP Semiconductors SA8027DH,512
- Part No.:
- SA8027DH,512
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SA8027DH,512.pdf
- Description:
- IC FRACT N SYNTH 20TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SA8027DH,512 from Philips Semiconductors is a 2.5 GHz RF fractional-N/IF integer frequency synthesizer in TSSOP20 package, designed for low-voltage (2.7–3.6 V), low-power (7.7 mA typical) operation in battery-powered wireless systems. It integrates programmable main (512–65535), auxiliary (128–16383), and reference (4–1023) dividers, fractional spurious compensation, and dual-mode charge pumps (PHP/PHI/PHA), enabling precise local oscillator synthesis in cellular handsets and WLAN transceivers.
For engineers reviewing the SA8027DH,512 datasheet, SA8027DH,512 pinout, SA8027DH,512 application, or SA8027DH,512 equivalent, key selection criteria include its 2.5 GHz VCO input range, 3-wire serial programming interface, split VDD/VDDCP supply architecture, lock detect output, and fractional-N phase noise performance (–90 dBc/Hz @ 1 kHz offset, 900 MHz).
Technical Context
The SA8027DH,512 implements a BICMOS-based phase-locked loop with a fully programmable fractional-N main divider (modulo-5/modulo-8 selectable), an IF integer auxiliary divider, and independent reference division. Its architecture supports simultaneous dual-loop operation - main loop for RF VCO control (500–2500 MHz), auxiliary loop for IF signal generation (100–550 MHz) - with separate charge pump outputs (PHP, PHI, PHA) and programmable current gain via RSET and CP0/CP1 bits.
It features adaptive speed-up mode (up to 15×/36× ISET on PHP/PHI), fractional compensation driven by FRD accumulator and FDAC (FC7–FC0), and hardware/software power-down (PON + PD bits). The 3-wire serial bus (CLOCK/STROBE/DATA) loads 24-bit A/B/C words in strict sequence to configure dividers, FDAC, lock mode, and charge pump settings without phase disturbance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCO Input Frequency | 500–2500 MHz: supports full-band GSM, DCS, PCS, UMTS, and WLAN RF front-end LO synthesis. |
| Main Divider Ratio | 512–65535: enables fine frequency resolution (e.g., 200 kHz step at 1.8 GHz with fREF = 13 MHz). |
| Supply Voltage | VDD = 2.7–3.6 V, VDDCP ≥ VDD: allows direct use with 3× NiCd or single Li-ion cell with minimal regulation. |
| Operational Current | 7.7 mA typical (main + aux on): extends battery life in portable phones and handheld radios. |
| Phase Noise | –90 dBc/Hz @ 1 kHz offset (900 MHz, GSM): meets stringent spectral purity requirements for adjacent channel rejection. |
| Lock Detect Output | Push-pull logic-level LOCK pin: provides real-time PLL status without external comparator or pull-up. |
| Serial Interface | 3-wire (CLOCK/STROBE/DATA), 24-bit words: simplifies microcontroller integration and reduces PCB routing complexity. |
Pinout & Package
TSSOP20 plastic thin shrink small outline package (SOT360-1), 4.4 mm body width, 0.65 mm pitch, lead-free compatible. Pin 1 marked by bevelled corner; pins 7 and 10 are GNDCP (shared charge pump ground); pins 3 (VDD) and 13 (VDDCP) require separate low-impedance paths to minimize supply coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LOCK (1) | Lock detect output | Active-high push-pull signal indicates stable phase lock of main and/or auxiliary loops per B-word configuration. |
| TEST (2) | Test control | Must be tied to GND or VDD; floating state may cause undefined behavior or increased leakage. |
| VDD (3) | Digital supply | Supplies logic core, shift registers, and address decoder; must be decoupled locally with 100 nF ceramic. |
| GND (4) | Digital ground | Reference for digital circuitry; must be externally connected to GNDCP to prevent die current flow damage. |
| RFin+ / RFin– (5/6) | Differential RF input | Accepts 50 Ω AC-coupled VCO signal up to 2.5 GHz; single-ended drive possible with one pin grounded. |
| GNDCP (7,10) | Charge pump ground | Dedicated analog ground for PHP/PHI/PHA; must be shorted to GND externally to avoid voltage differential > ±0.3 V. |
| PHP / PHI (8/9) | Main charge pump outputs | Drive passive loop filter; PHP = normal mode, PHI = integral mode; both support speed-up (15×/36× ISET). |
| PHA (11) | Auxiliary charge pump | Drives IF loop filter; programmable gain (0.5×–1.5× ISET) via CP0/CP1 bits in C-word. |
| AUXin (12) | Auxiliary divider input | Accepts 100–550 MHz IF signal; high-impedance input (3.9 kΩ @ 500 MHz) minimizes loading on preceding stage. |
| VDDCP (13) | Analog supply | Must be ≥ VDD and ≤ VDD + 0.9 V; powers charge pumps and phase detectors for optimal noise performance. |
| RSET (14) | Charge pump bias resistor | 6–15 kΩ to GND sets ISET (1.22 V regulated); determines all charge pump currents and matching accuracy. |
| REFin– / REFin+ (15/16) | Differential reference input | Accepts 5–40 MHz TCXO signal; 10 kΩ input impedance at 20 MHz enables direct connection without buffer. |
| CLOCK / DATA / STROBE (17–19) | Serial programming interface | CMOS-compatible 3-wire bus; STROBE edge latches 24-bit word; minimum clock period = 100 ns. |
| PON (20) | Hardware power-down | Active-low enable; ORed with software PD bit; forces full shutdown with <1 µA standby current. |
Key Features
| Feature | Design Value |
|---|---|
| Fractional spurious compensation | Integrated FDAC (FC7–FC0) and FRD-driven current injection eliminates fractional-N spurs without external DAC or calibration. |
| Adaptive speed-up mode | Strobe-width-controlled transient boost (up to 36× ISET on PHI) reduces lock time for large frequency hops (>100 MHz). |
| Split supply architecture | Independent VDD (digital) and VDDCP (analog) rails isolate noise-sensitive charge pumps from logic switching transients. |
| Programmable loop filter bandwidth | Four charge pump gain options (via CP0/CP1) allow dynamic adjustment of loop bandwidth without changing external components. |
| Hardware + software power-down | PON pin + PD bits in B-word provide redundant control; full shutdown draws only 1 µA, preserving battery during idle periods. |
Applications
| Cellular Handset LO Synthesis | WLAN 2.4 GHz Transceiver |
|---|---|
Use Scenario: Generating local oscillator signals for dual-band GSM/DCS/PCS handset RF front-ends operating from 880–1990 MHz. IC Role / Device Role / Timing Role: Primary fractional-N synthesizer driving VCO; provides fast frequency switching and low close-in phase noise for EVM compliance. Use Value: Enables single-chip dual-loop architecture with 7.7 mA total current, extending talk time beyond 3 hours on 3× NiCd cells. | Use Scenario: Providing precise 2.4 GHz LO for IEEE 802.11b/g WLAN transceivers requiring <–90 dBc/Hz phase noise at 1 kHz offset. IC Role / Device Role / Timing Role: Main loop synthesizer with fREF = 20 MHz TCXO; delivers stable LO with integrated fractional compensation. Use Value: Eliminates need for external spur suppression filters, reducing BOM count and PCB area by >15% versus discrete solutions. |
| Portable Radio IF Generation | Battery-Powered Test Equipment |
Use Scenario: Generating 210–450 MHz IF signals in handheld spectrum analyzers and signal generators. IC Role / Device Role / Timing Role: Auxiliary integer-N synthesizer (AUXin path); operates independently from main loop for flexible multi-band coverage. Use Value: Achieves –77 dBc/Hz phase noise at 2100 MHz with fREF = 19.44 MHz, meeting EN 300 328 spectral mask requirements. | Use Scenario: Serving as programmable clock source in portable RF test modules requiring rapid frequency reconfiguration. IC Role / Device Role / Timing Role: Fully configurable frequency generator with 3-wire serial interface; supports on-the-fly divider updates via microcontroller. Use Value: Reduces firmware overhead with synchronized A-word reload, avoiding phase glitches during frequency sweeps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RF frequency synthesizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX2870ETJ+ | 2.5 GHz wideband fractional-N synthesizer with integrated VCO and SPI interface; higher integration but no auxiliary divider. | Single-loop architectures only; lacks dedicated IF path for dual-conversion receivers. | Choose MAX2870ETJ+ when VCO integration and SPI compatibility outweigh need for auxiliary IF synthesis. |
| ADF4351BCPZ | 4.4 GHz fractional-N synthesizer with integrated VCO and SPI; wider frequency range but higher 117 mA supply current. | Not suitable for ultra-low-power portable designs; requires active cooling above 85 °C ambient. | Choose ADF4351BCPZ for broadband lab equipment where power efficiency is secondary to frequency agility. |
Compared with MAX2870ETJ+ and ADF4351BCPZ, the SA8027DH,512 uniquely combines dual-loop capability (RF + IF), sub-8 mA operation, and TSSOP20 footprint - making it the only option supporting battery-powered dual-conversion receivers with <1 µA deep-sleep current.
Availability
SA8027DH,512 is available at Aetrix Electronics and suitable for cellular handset design, WLAN transceiver development, and portable radio equipment requiring stable component supply across extended production lifecycles.
Supply support for SA8027DH,512 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
Philips Semiconductors (now NXP Semiconductors) is a Dutch semiconductor company founded in 1953, specializing in analog, RF, and mixed-signal ICs for communications and consumer electronics.
The SA8027DH,512 belongs to Philips' RF synthesizer product line, engineered specifically for low-voltage, low-power wireless handsets and portable radios operating in licensed and unlicensed ISM bands.
FAQ
What is the maximum VCO input frequency supported by the SA8027DH,512?
The SA8027DH,512 supports VCO input frequencies from 500 MHz to 2500 MHz. This 2.5 GHz upper limit enables direct synthesis for GSM, DCS, PCS, UMTS, and 2.4 GHz WLAN bands without prescaler limitations. Operation above 2500 MHz is not guaranteed and violates absolute maximum ratings.
How does the SA8027DH,512 implement fractional-N spurious reduction?
The SA8027DH,512 uses on-chip fractional compensation driven by the FRD accumulator and FDAC (FC7–FC0) register. It injects a proportional current pulse (width = 128 VCO cycles) into the loop filter to cancel fractional phase ripple. This eliminates external DACs and calibration, achieving –90 dBc/Hz phase noise at 1 kHz offset for 900 MHz outputs.
Can the SA8027DH,512 operate with a single 3.3 V supply?
Yes, the SA8027DH,512 operates with VDD = VDDCP = 3.3 V within its specified 2.7–3.6 V range. However, VDDCP must be ≥ VDD, so tying both rails together at 3.3 V is valid. Decoupling capacitors (100 nF ceramic each) are required on both VDD and VDDCP pins to maintain PSRR and phase noise performance.
What is the function of the RSET pin on the SA8027DH,512?
The RSET pin on the SA8027DH,512 sets the base charge pump current (ISET) via an external resistor (6–15 kΩ to GND). It regulates a 1.22 V reference internally, establishing ISET = 1.22 V / RSET. All charge pump currents (PHP, PHI, PHA) scale proportionally to ISET, enabling precise loop filter design and current matching.
Does the SA8027DH,512 support simultaneous main and auxiliary loop operation?
Yes, the SA8027DH,512 supports concurrent main and auxiliary loop operation. The main divider handles RF VCO frequencies (500–2500 MHz), while the auxiliary divider processes IF signals (100–550 MHz). Independent lock detection and power-down control (via PD bits in B-word) allow flexible dual-loop configurations without hardware modification.
SA8027DH,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Fractional N Synthesizer
- PLL:
- Yes
- Input:
- Clock
- Output:
- Clock
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 2:3
- Differential - Input:Output:
- Yes/No
- Frequency - Max:
- 2.5GHz
- Divider/Multiplier:
- Yes/No
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 20-TSSOP
SA8027DH,512 FAQ
1.How can I place an order for SA8027DH,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA8027DH,512 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 SA8027DH,512 reliable?
The price and inventory of SA8027DH,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA8027DH,512 is usually 5 days.
3.What payment methods are accepted for SA8027DH,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA8027DH,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA8027DH,512?
SA8027DH,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA8027DH,512 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 SA8027DH,512?
For technical support, including SA8027DH,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA8027DH,512 requirements.
6.How does Aetrix verify that SA8027DH,512 is sourced from the original manufacturer or authorized distributors?
All SA8027DH,512 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 SA8027DH,512 meets industry standards.
7.What is the process for return or replacement of SA8027DH,512?
All SA8027DH,512 units undergo pre-shipment inspection (PSI). If there is an issue with SA8027DH,512, 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 SA8027DH,512 part is unused and in its original packaging.
Return procedure for SA8027DH,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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