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Microchip Technology U2793B-NFSH 19
- Part No.:
- U2793B-NFSH 19
- Manufacturer:
- Microchip Technology
- Category:
- RF Modulators
- Package:
- 20-LSSOP (0.173", 4.40mm Width)
- Datasheet:
-
U2793B-NFSH 19.pdf
- Description:
- RF MODULATOR 30-300MHZ 20LSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,929
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Product details
Overview
U2793B-NFSH 19 from Atmel is a 300-MHz quadrature modulator IC designed for digital radio up-conversion in GSM, PCN, JDC, and WLAN systems. It features single-ended 50-Ω RF/LO ports, 5 V supply, 15 mA quiescent current, and integrated duty-cycle regeneration for sideband suppression. Its phase-control loop delivers precise 90° I/Q shifting with <1° phase error.
For engineers reviewing the U2793B-NFSH 19 datasheet, U2793B-NFSH 19 pinout, U2793B-NFSH 19 application, or U2793B-NFSH 19 equivalent, key selection criteria include LO frequency range (30–300 MHz), output level adjustability via pins 19/20, LO suppression (>32 dB), sideband suppression (>35 dB), and SSO20 package compatibility with RF layout constraints.
Technical Context
The U2793B-NFSH 19 implements a fully integrated quadrature modulation architecture with on-chip frequency doubler, duty-cycle regenerator, and Σ-based 90° control loop-enabling adjustment-free I/Q phase alignment. It accepts differential baseband inputs (0–50 MHz, 1.0 Vpp typ.) and operates with low LO drive (-15 dBm min.) across its full 30–300 MHz range.
Its RF output stage delivers tunable power (-3 to +2 dBm) while maintaining >45 dB LO suppression and <±0.25 dB amplitude error. Pins 19 (LP2) and 20 (LP1) provide external low-pass filtering and output-level control without degrading noise floor (-143 dBm/Hz typ.) or LO suppression performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LO Frequency Range | 30–300 MHz: supports direct up-conversion for cellular and WLAN bands without external frequency synthesis |
| Supply Voltage | 4.5–5.5 V: compatible with standard 5 V rail; 5 V typical enables 15 mA operation |
| RF Output Level | -3 to +2 dBm: adjustable via LP1/LP2 pins; sufficient to drive next-stage mixer (e.g., U2795B) without amplification |
| LO Suppression | 32–45 dB: minimizes LO leakage into antenna path, easing front-end filter requirements |
| Sideband Suppression | 35–45 dB: ensures clean spectral purity for compliant digital modulation (GSM/EDGE) |
| Phase Error | <1°: maintains EVM integrity in QPSK/16-QAM systems by preserving I/Q orthogonality |
| Amplitude Error | <±0.25 dB: prevents constellation distortion and adjacent channel power ratio (ACPR) degradation |
Pinout & Package
U2793B-NFSH 19 is housed in a lead-free SSO20 (Shrink Small Outline) package with 0.65 mm pitch, optimized for RF signal integrity and thermal dissipation (RthJA = 140 K/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PU) | Power-up control input | Active-high enable: logic high ≥4 V activates device; ≤0.5 V places IC in µA-level power-down mode |
| 4 (RFO) | RF output | Single-ended 50-Ω output port delivering modulated RF signal; requires 50-Ω microstrip routing |
| 6,7 (VS) | Supply voltage | Dual 5 V supply pins reduce IR drop and improve PSRR for RF performance stability |
| 9,10 (BBAI) | Baseband A differential input | Accepts 1.0 Vpp differential I-channel signal; 30 kΩ input impedance simplifies AC-coupling network design |
| 11,12 (BBBI) | Baseband B differential input | Accepts 1.0 Vpp differential Q-channel signal; matched delay/path to BBAI ensures I/Q timing alignment |
| 13 (VREF) | Reference voltage output | Stable 2.5 V ±125 mV reference for external DACs or biasing; 30 Ω output impedance supports local decoupling |
| 14,15 (LOI) | LO input / LO inverse | Single-ended LO drive at -15 dBm; LOI inverse typically grounded to enable internal duty-cycle regeneration |
| 19 (LP2), 20 (LP1) | Low-pass/power control | External RC network between LP1–LP2 adjusts output level and spurious performance-critical for low-frequency (<100 MHz) applications |
Key Features
| Feature | Design Value |
|---|---|
| Integrated duty-cycle regenerator | Compensates for LO duty-cycle distortion, enabling >35 dB sideband suppression without external correction circuitry |
| Adjustable output level & spurs | Pins 19/20 allow fine-tuning of RF output amplitude and low-frequency spurious content using discrete RC components |
| Phase-control loop for 90° shift | On-die feedback loop maintains <1° phase error over temperature (-40°C to +85°C) and supply variation |
| Low LO input requirement | -15 dBm LO drive reduces need for LO buffer amplifiers-lowers system power and component count |
| Power-down mode | PU pin reduces supply current to 1 µA, enabling burst-mode operation in TDMA systems like GSM |
Applications
| GSM Base Station Transmitter | WLAN 2.4 GHz Up-Converter |
|---|---|
Use Scenario: Transmit path in GSM 900/1800 MHz base station requiring high linearity and spectral purity for multi-carrier operation. IC Role / Device Role / Timing Role: Quadrature modulator converting baseband I/Q signals to RF; provides precise 90° phase shift and LO suppression critical for ACLR compliance. Use Value: Achieves >45 dB LO suppression and <1° phase error-reducing post-modulation filtering complexity and improving adjacent channel leakage ratio (ACLR) by ≥3 dB. | Use Scenario: Direct-conversion transmitter in IEEE 802.11b/g access point operating at 2.4 GHz using external U2795B mixer. IC Role / Device Role / Timing Role: First-stage modulator generating 2.4 GHz IF; interfaces with Atmel's U2795B to realize full up-conversion chain. Use Value: Enables seamless integration with U2795B via matched 50-Ω ports and shared LO path-eliminating inter-stage matching networks and saving ≥2 cm² PCB area. |
| PCN Handset Front-End | JDC Mobile Transceiver |
Use Scenario: Compact transceiver module in Personal Communication Network (PCN) handsets requiring low power and small footprint. IC Role / Device Role / Timing Role: Low-power quadrature modulator supporting burst-mode transmission; PU pin enables µA-level sleep during idle slots. Use Value: 15 mA supply current and 1 µA power-down current extend battery life by ≥25% versus comparable modulators in TDMA architectures. | Use Scenario: Japanese Digital Cellular (JDC) mobile terminal needing robust I/Q balance under temperature variation. IC Role / Device Role / Timing Role: Core modulator ensuring stable EVM across -40°C to +85°C ambient; leverages on-chip VREF (2.5 V ±5%) for consistent DAC interface. Use Value: Maintains <±0.25 dB amplitude error and <1° phase error over full industrial temperature range-preserving 16-QAM constellation fidelity without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quadrature modulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADL5375-05 | Higher LO range (300–4000 MHz); requires 3.3 V supply; no integrated duty-cycle regenerator | Targets broadband LTE/WiMAX; lacks built-in LO regeneration-requires external LO conditioning for sideband suppression | Choose ADL5375-05 only if extending beyond 300 MHz LO or migrating to 3.3 V systems; U2793B-NFSH 19 remains optimal for sub-300 MHz, 5 V, cost-sensitive designs |
| TRF3705 | Integrated PLL/VCO; 50–4000 MHz LO range; higher supply current (45 mA); different pinout and package (QFN) | Designed for fully integrated transceivers; not pin-compatible; requires redesign of RF layout and power delivery | Select TRF3705 when system-level integration (LO generation + modulation) is prioritized over board space and power; U2793B-NFSH 19 offers lower BOM count for discrete LO architectures |
Compared with ADL5375-05 and TRF3705, U2793B-NFSH 19 delivers superior sideband suppression and lower power in its native 30–300 MHz band, with minimal external components-making it ideal for legacy digital radio systems where LO conditioning and thermal efficiency are critical.
Availability
U2793B-NFSH 19 is available at Aetrix Electronics and suitable for GSM base station transmitters, WLAN up-converter modules, and JDC mobile transceivers requiring stable component supply, long-lifecycle support, and lead-free compliance.
Supply support for U2793B-NFSH 19 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
Atmel Corporation (now part of Microchip Technology) is a semiconductor company specializing in microcontrollers, RF ICs, and mixed-signal solutions for communications and embedded systems.
The U2793B-NFSH 19 belongs to Atmel's RF front-end product line, engineered specifically for high-performance, low-power quadrature modulation in digital cellular infrastructure and portable radio equipment.
FAQ
What is the function of pins 19 and 20 on the U2793B-NFSH 19?
Pins 19 (LP2) and 20 (LP1) on the U2793B-NFSH 19 provide external low-pass filtering and output-level control. Adding a chip capacitor between them improves spurious performance-especially below 100 MHz-while a parallel resistor adjusts RF output level to the next-stage mixer without degrading LO suppression or noise floor. This capability is documented in the U2793B-NFSH 19 datasheet Section 5, Note 3.
Does the U2793B-NFSH 19 require external LO conditioning for optimal sideband suppression?
No-the U2793B-NFSH 19 integrates a duty-cycle regenerator that actively corrects LO waveform distortion, enabling >35 dB sideband suppression without external components. This feature is intrinsic to the U2793B-NFSH 19 architecture and eliminates the need for external LO shaping circuits required by many competing modulators.
What is the maximum baseband input frequency supported by the U2793B-NFSH 19?
The U2793B-NFSH 19 supports baseband input frequencies from DC to 50 MHz, as specified in Table 5.2.3 of its datasheet. This range accommodates standard I/Q bandwidths for GSM, PCN, JDC, and 2.4 GHz WLAN baseband signals, with 1.0 Vpp differential drive recommended for optimal linearity and EVM.
Can the U2793B-NFSH 19 operate with a 3.3 V supply?
No-the U2793B-NFSH 19 is rated for 4.5–5.5 V operation only. Absolute maximum supply voltage is 6 V, and minimum functional supply is 4.5 V. Attempting 3.3 V operation will result in failure to power up or degraded RF performance; it is not compatible with 3.3 V systems without level-shifting or regulation.
How does the U2793B-NFSH 19 achieve <1° phase error across temperature?
The U2793B-NFSH 19 achieves <1° phase error across -40°C to +85°C via an on-chip phase-control feedback loop that dynamically adjusts the 90° shifter. This closed-loop architecture compensates for process, voltage, and temperature (PVT) variations-ensuring consistent I/Q orthogonality without factory calibration or external tuning, as verified in datasheet Section 4.5.
U2793B-NFSH 19 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-LSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Modulator
- LO Frequency:
- 30MHz ~ 300MHz
- RF Frequency:
- 30MHz ~ 300MHz
- P1dB:
- -
- Noise Floor:
- -137dBm/Hz
- Output Power:
- -1dBm
- Current - Supply:
- 15 mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Test Frequency:
- 150MHz
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSO
U2793B-NFSH 19 FAQ
1.How can I place an order for U2793B-NFSH 19 through Aetrix?
Please submit a Request for Quotation (RFQ) for U2793B-NFSH 19 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 U2793B-NFSH 19 reliable?
The price and inventory of U2793B-NFSH 19 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for U2793B-NFSH 19 is usually 5 days.
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U2793B-NFSH 19 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your U2793B-NFSH 19 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 U2793B-NFSH 19?
For technical support, including U2793B-NFSH 19 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your U2793B-NFSH 19 requirements.
6.How does Aetrix verify that U2793B-NFSH 19 is sourced from the original manufacturer or authorized distributors?
All U2793B-NFSH 19 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 U2793B-NFSH 19 meets industry standards.
7.What is the process for return or replacement of U2793B-NFSH 19?
All U2793B-NFSH 19 units undergo pre-shipment inspection (PSI). If there is an issue with U2793B-NFSH 19, 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 U2793B-NFSH 19 part is unused and in its original packaging.
Return procedure for U2793B-NFSH 19:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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