MAX2871ETJ+T – Complete Datasheet Summary

1. Basic Device Information

• Part Number: MAX2871ETJ+T
• Manufacturer: Maxim Integrated (Analog Devices)
• Device Type: Ultra-Wideband Fractional/Integer-N PLL Synthesizer with Integrated VCO
• Frequency Range: 23.5 MHz to 6000 MHz
• Core: Multi-band integrated VCO (3–6 GHz) + 1–128 dividers
• Package: 32-pin TQFN-EP (5 mm × 5 mm), TJ package
• Packing: Tape-and-reel (T suffix)
• RoHS/Lead-free: Compliant (+ suffix)
• Temperature Grade: Extended industrial −40°C to +85°C
• Logic Compatibility: 1.8V digital I/O
• Pin/Software Compatible: MAX2870
• Document: Rev 4, June 2020

2. Key Features

• Frequency coverage: 23.5 MHz–6 GHz using internal VCO and dividers
• Fractional-N & Integer-N operation
• Low normalized in-band phase noise: −230 dBc/Hz
• Dual differential programmable RF outputs
• Output power: −1 dBm to +8 dBm differential (per channel)
• Independent output mute & power control
• Fast lock + cycle-slip reduction
• Auto or manual VCO selection
• Phase adjustment / multi‑chip phase synchronization
• On-chip 7-bit temperature sensor + ADC
• On-chip 7-bit tune voltage ADC
• 4-wire SPI interface (3-wire write, 4-wire read)
• Low-phase-noise PFD up to 140 MHz
• Reference input up to 210 MHz
• Internal compensation; minimal external components
• Overtemperature & overvoltage protection

3. Electrical Specifications

Supply

Reference Input

Phase Detector (PFD)

RF Output

Phase Noise (Typical)

表格

Charge Pump

Digital I/O

4. Absolute Maximum Ratings

• VCC to GND: −0.3 V to +3.9 V
• All other pins: −0.3 V to VCC + 0.3 V
• Continuous power dissipation: 2759 mW (TA ≤ 70°C)
• Junction temperature: +150°C
• Storage temperature: −65°C to +150°C
• Reflow temperature: +260°C
• ESD HBM: Class 1A

5. Thermal Data (32-pin TQFN-EP)

• θJA (junction-to-ambient): 29°C/W
• θJC (junction-to-case): 1.7°C/W
• Exposed pad must be soldered to PCB ground

6. Pin Configuration (32-Pin TQFN‑EP, Top View)

7. Functional Description

• Architecture: Integer‑N / Fractional‑N PLL with integrated wideband VCO
• VCO: 4 core VCOs covering 3–6 GHz, 16 sub‑bands each
• Output Dividers: 1, 2, 4, 8, 16, 32, 64, 128
• Dual Differential Outputs: Independent enable, power, mute
• Control: SPI (6 write registers, 1 read register)
• Lock Detect: Digital or analog; configurable precision
• Fast‑Lock: External pin (SW) enables fast‑lock filter topology
• Cycle‑Slip Reduction: Improves lock time
• Phase Sync: Supports multi‑chip phase synchronization
• Auto VCO Select (VAS): Automatically selects optimal VCO band
• Mute‑until‑Lock: Disables outputs until locked

8. Modes of Operation

• Integer‑N: INT = 1; low spurious
• Fractional‑N: INT = 0; fine frequency resolution
• Auto Integer: F01 = 1; auto‑switches to Integer when FRAC = 0
• Fast‑Lock: CDM = 01; reduces lock time
• Cycle‑Slip Reduction: CSM = 1; improves lock speed
• Phase Adjustment: CDM = 10; adjusts output phase
• Low‑Spur Mode: SDN = 10/11; reduces fractional spurs
• Low‑Noise Mode: SDN = 00; best phase noise

9. Application Circuit Requirements

• Loop filter between CP_OUT and TUNE
• RSET resistor (2.7–10 kΩ) from pin 22 to GND
• Decoupling caps on all VCC pins (≥0.1 µF ceramic)
• 1 µF caps on NOISE_FILT, BIAS_FILT, REG
• RF outputs: 50 Ω match; external choke or resistor to VCC_RF
• REF_IN: AC‑coupled
• MUX: Used for phase sync, monitor, or SPI readback

10. Typical Applications

• Wireless infrastructure
• Microwave radios
• Test & measurement
• Clock generator
• LoRa/Wi-Fi/Bluetooth systems
• Radar and sensor systems
• Point-to-point microwave

11. Ordering & Marking

• MAX2871ETJ+T: −40°C to +85°C, 32-pin TQFN-EP, tape-and-reel
• Package code: T3255+5
• Land pattern: 90-0013
• RoHS compliant, lead-free