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NXP Semiconductors SA8027DH,518
- Part No.:
- SA8027DH,518
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SA8027DH,518.pdf
- Description:
- IC FRACT N SYNTH 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,532
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Product details
Overview
SA8027DH,518 from Philips Semiconductors is a 2.5 GHz low-voltage, low-power RF fractional-N/IF integer frequency synthesizer in TSSOP20 package. It integrates programmable main/auxiliary/reference dividers, dual-phase detectors, and fully programmable charge pumps (PHP/PHI/PHA) with fractional spurious compensation. Designed for battery-powered pocket phones operating from 3 NiCd cells (2.7–3.6 V), it delivers 7.7 mA typical supply current and supports VCO input frequencies from 500 MHz to 2.5 GHz.
For engineers reviewing the SA8027DH,518 datasheet, SA8027DH,518 pinout, SA8027DH,518 application, or SA8027DH,518 equivalent, key selection considerations include its 3-wire serial programming interface, split VDD/VDDCP supplies, RSET-based charge pump current tuning (6–15 kΩ), lock detect output, and fractional-N architecture enabling fine frequency resolution in GSM, TDMA, and WLAN transceivers.
Technical Context
The SA8027DH,518 implements a BICMOS fractional-N PLL with a main divider supporting 512–65535 ratios (modulo-5/modulo-8 selectable) and an auxiliary divider covering 128–16383. Its phase/frequency detector drives three independent charge pumps-PHP (normal), PHI (integral), and PHA (auxiliary)-each programmable via CP0/CP1 bits and scalable using external RSET (7.5 kΩ nominal).
Fractional spurious compensation is implemented via a dedicated FDAC-controlled current source synchronized to the main divider's fractional accumulator, with fixed 128-VCO-cycle pulse width and amplitude scaling by FDAC (0–255) and FRD value. Lock detection combines main and auxiliary loop status with configurable output drive mode (push-pull/open-drain).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCO Input Frequency | 500–2500 MHz: supports full-band cellular (GSM/DCS/PCS), WLAN (2.4 GHz), and TDMA operation without external prescalers. |
| Supply Voltage | 2.7–3.6 V (VDD and VDDCP): enables direct use with 3-cell NiCd or single Li-ion battery systems. |
| Supply Current | 7.7 mA typical (main + aux on); 1 µA in power-down: extends battery life in portable radios and handsets. |
| Main Divider Ratio | 512–65535, fractional-N with 3-bit NF: achieves sub-Hz frequency resolution at 2.5 GHz output. |
| RSET Range | 6–15 kΩ: sets ISET bias current (81–204 µA), directly scaling all charge pump outputs (PHP/PHI/PHA) per Table 1. |
| Phase Noise | –90 dBc/Hz @ 1 kHz offset (900 MHz, GSM); –85 dBc/Hz @ 1 kHz (800 MHz, TDMA): meets stringent spectral purity requirements. |
| Serial Interface | 3-wire (CLOCK/STROBE/DATA), 24-bit words (A/B/C/D): allows full configuration of dividers, FDAC, lock mode, and power-down via microcontroller. |
Pinout & Package
SA8027DH,518 is housed in a plastic thin shrink small outline package (TSSOP20, SOT360-1) with 20 leads and 4.4 mm body width. Pin 1 is LOCK; pins 7 and 10 are GNDCP (shared charge pump ground); pin 14 is RSET (external resistor to GND for charge pump current setting).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LOCK (1) | Lock detect output | Active-high push-pull signal indicating combined main/auxiliary PLL lock; configurable via B-word L1/L0 bits. |
| VDD (3) | Digital supply | Supplies logic core and serial interface; must be ≤ VDDCP per ∆(VDDCP–VDD) limit (≤ +0.9 V). |
| RFin+/RFin– (5/6) | RF input to main divider | Differential 50 Ω input accepting –18 to 0 dBm signals up to 2.5 GHz; internal preamp enables single-ended drive. |
| PHP/PHI (8/9) | Main charge pump outputs | Drive passive loop filter; PHP provides normal current, PHI integral current; both programmable (0.5× to 36× ISET). |
| PHA (11) | Auxiliary charge pump output | Drives IF loop filter; programmable (0.5× or 1.5× ISET); supports dual-loop architectures for image rejection. |
| RSET (14) | Charge pump current reference | External resistor (6–15 kΩ) sets ISET bias; regulates VSET = 1.22 V and scales all pump currents linearly. |
| REFin+/REFin– (15/16) | Crystal reference input | Differential TCXO interface (5–40 MHz); high-impedance input (10 kΩ @ 20 MHz) minimizes crystal load. |
| CLOCK/DATA/STROBE (17/18/19) | Serial programming bus | 3-wire interface requiring 24-bit A/B/C words in sequence; STROBE edge latches data into selected register group. |
| PON (20) | Hardware power-down control | Active-low signal that ORs with software PD bits; forces full shutdown with <1 µA quiescent current. |
Key Features
| Feature | Design Value |
|---|---|
| Fractional spurious compensation | FDAC-controlled current injection synchronized to fractional accumulator overflow eliminates fractional-N spurs without external DAC or calibration. |
| Speed-up charge pump mode | PHP/PHI deliver up to 15×/36× ISET during large frequency hops (via strobe pulse width or Tspu bit), reducing lock time without active switches. |
| Split analog/digital supplies | VDDCP ≥ VDD ensures analog charge pump noise isolation; separate GNDCP pins prevent substrate coupling into sensitive RF paths. |
| Programmable loop filter bandwidth | Charge pump gain (CP0/CP1) and RSET jointly set loop dynamics; enables optimization across frequency bands and stability margins. |
| Multi-mode lock detection | LOCK pin output configurable for main-only, aux-only, or combined lock indication with push-pull or open-drain drive. |
Applications
| GSM Cellular Handset Transceiver | WLAN 2.4 GHz Direct-Conversion Receiver |
|---|---|
Use Scenario: Dual-band (900/1800 MHz) GSM handset requiring fast channel switching and low phase noise for GMSK modulation. IC Role / Device Role / Timing Role: Main fractional-N synthesizer generating VCO tuning voltage for RF front-end; auxiliary synthesizer providing IF local oscillator. Use Value: –90 dBc/Hz phase noise @ 1 kHz offset ensures EVM compliance; 7.7 mA supply current extends talk time on 3-cell NiCd battery. | Use Scenario: IEEE 802.11b receiver using zero-IF architecture with image-reject downconversion. IC Role / Device Role / Timing Role: Primary synthesizer generating 2.4 GHz LO; auxiliary path provides quadrature LO for complex mixing. Use Value: Differential RFin inputs (500–2500 MHz) support direct 2.4 GHz injection; fractional-N resolution enables precise channel spacing (5 MHz). |
| TDMA Base Station Local Oscillator | Portable Battery-Powered Radio Equipment |
Use Scenario: IS-136 TDMA base station requiring stable 800/1900 MHz LO with low close-in phase noise. IC Role / Device Role / Timing Role: Reference-synchronized synthesizer driving VCO in transmit/receive LO chain; uses TCXO reference (19.44 MHz). Use Value: –85 dBc/Hz @ 1 kHz offset (800 MHz) meets adjacent-channel leakage ratio (ACLR) specs; RSET tuning enables loop optimization per band. | Use Scenario: Compact handheld two-way radio operating across 400–500 MHz bands with limited PCB area. IC Role / Device Role / Timing Role: Single-chip frequency synthesis solution replacing discrete PLL components and reducing BOM count. Use Value: TSSOP20 package (4.4 mm width) saves board space; 3-wire serial interface simplifies MCU integration versus parallel bus alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RF fractional-N synthesizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX2769 | Integrated GPS/GNSS receiver front-end with LNA, mixer, and 16-bit ADC; synthesizer section covers 1.575 GHz only. | Targeted exclusively at GPS L1-band; lacks dual-loop, IF integer, or 2.5 GHz VCO support. | Select MAX2769 only for GPS receiver designs requiring integrated signal chain; not suitable for cellular/WLAN multi-band synthesis. |
| AD9854 | Direct digital synthesizer (DDS) with 300 MHz system clock; no fractional-N PLL; outputs sine wave directly via on-chip DAC. | Used for arbitrary waveform generation, not RF LO synthesis; requires external upconversion for >300 MHz. | Choose AD9854 for lab instrumentation or agile signal sources; SA8027DH,518 remains preferred for low-power, high-frequency RF LO generation. |
Compared with MAX2769 and AD9854, the SA8027DH,518 uniquely combines 2.5 GHz VCO support, dual-loop fractional-N/IF integer architecture, and ultra-low 7.7 mA operating current-making it optimal for battery-powered multi-standard wireless transceivers where power, frequency range, and integration level are critical.
Availability
SA8027DH,518 is available at Aetrix Electronics and suitable for GSM handset design, WLAN 2.4 GHz transceivers, TDMA base station LO generation, and portable battery-powered radio equipment requiring stable component supply across extended temperature ranges (–40 °C to +85 °C).
Supply support for SA8027DH,518 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 global semiconductor leader specializing in analog, RF, and mixed-signal ICs for communications, automotive, and consumer markets.
The SA8027DH,518 belongs to Philips' RF frequency synthesizer product line, engineered specifically for low-voltage, low-power wireless infrastructure and portable terminal applications demanding high spectral purity and flexible programmability.
FAQ
What is the maximum VCO input frequency supported by the SA8027DH,518?
The SA8027DH,518 supports VCO input frequencies up to 2.5 GHz, as confirmed in the General Description and Quick Reference Data sections of the official Philips product data sheet. This enables direct synthesis for GSM (900/1800 MHz), PCS (1900 MHz), and WLAN (2.4 GHz) bands without external prescaling. The RFin+ and RFin– inputs are specified for operation from 500 MHz to 2500 MHz with –18 dBm to 0 dBm AC-coupled signal levels.
How does the SA8027DH,518 implement fractional spurious compensation?
The SA8027DH,518 implements fractional spurious compensation using a dedicated FDAC-controlled current source driven by the fractional accumulator (FRD). The compensation current ICOMP is injected synchronously with the main divider's fractional ripple, with fixed 128-VCO-cycle pulse width and amplitude scaled by FDAC (bits FC7–FC0) and FRD value. As stated in Section 1.6, proper compensation requires matching the area of the ICOMP pulse to the fractional charge pump ripple, eliminating spurs without external calibration.
What are the supply voltage requirements for SA8027DH,518 operation?
The SA8027DH,518 requires two supply rails: VDD (digital core, 2.7–3.6 V) and VDDCP (analog charge pump, 2.7–3.6 V), with VDDCP ≥ VDD per the limiting value ∆(VDDCP–VDD) ≤ +0.9 V. Both supplies must remain within –0.3 V to +3.6 V absolute limits. These specifications enable reliable operation from 3-cell NiCd batteries (nominal 3.6 V) or regulated 3.3 V systems while maintaining noise isolation between digital and analog domains.
Can the SA8027DH,518 be used in a single-loop configuration?
Yes, the SA8027DH,518 supports single-loop operation by powering down the auxiliary synthesizer path via the PD bits in the B-word while keeping the main PLL active. The auxiliary divider (AUXin) and PHA output can be disabled independently, allowing the device to function solely as a high-frequency fractional-N synthesizer. The lock detect output remains valid for the main loop alone when configured via L1/L0 bits for "Main lock detect signal."
What is the role of the RSET pin on the SA8027DH,518?
The RSET pin on the SA8027DH,518 connects to an external resistor (6–15 kΩ) to ground, establishing the ISET bias current that scales all internal charge pump outputs (PHP, PHI, PHA). As documented in Section 1.5 and Table 1, ISET = VSET/RSET (VSET = 1.22 V typical), and pump currents are programmable multiples (0.5× to 36×) of ISET. This allows precise loop filter bandwidth tuning and optimization of phase noise versus lock time trade-offs.
SA8027DH,518 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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,518 FAQ
1.How can I place an order for SA8027DH,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA8027DH,518 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,518 reliable?
The price and inventory of SA8027DH,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA8027DH,518 is usually 5 days.
3.What payment methods are accepted for SA8027DH,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA8027DH,518 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA8027DH,518?
SA8027DH,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA8027DH,518 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,518?
For technical support, including SA8027DH,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA8027DH,518 requirements.
6.How does Aetrix verify that SA8027DH,518 is sourced from the original manufacturer or authorized distributors?
All SA8027DH,518 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,518 meets industry standards.
7.What is the process for return or replacement of SA8027DH,518?
All SA8027DH,518 units undergo pre-shipment inspection (PSI). If there is an issue with SA8027DH,518, 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,518 part is unused and in its original packaging.
Return procedure for SA8027DH,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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