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Analog Devices Inc./Maxim Integrated MAX4685ETB+
- Part No.:
- MAX4685ETB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX4685ETB+.pdf
- Description:
- IC SWITCH SPDTX2 800MOHM 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,478
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Product details
Overview
MAX4685ETB+ from Maxim Integrated is a dual single-pole/double-throw (SPDT) analog switch optimized for low-voltage, low-distortion signal routing in portable audio and power management systems. It features 0.8Ω max on-resistance for both NO and NC paths at +2.7V supply, 50ns turn-on time, 40ns turn-off time, and rail-to-rail analog signal handling from GND to V+. It is used in speaker headset switching and battery-operated equipment where compact size and low RON matching are critical.
For engineers reviewing the MAX4685ETB+ datasheet, MAX4685ETB+ pinout, MAX4685ETB+ application, or MAX4685ETB+ equivalent, this page delivers verified electrical parameters, UCSP package layout, break-before-make timing behavior, THD performance, and real-world audio/power routing use cases - all confirmed from Maxim's official datasheet Rev 4 (1/09).
Technical Context
The MAX4685ETB+ implements two independent SPDT switches with break-before-make action (2ns delay), ensuring no signal shorting during state transitions. Its BiCMOS process enables 0.8Ω max RON across both NO and NC paths at +2.7V, with RON flatness of 0.35Ω max over full signal range (0V to V+).
Digital control inputs are 1.8V logic-compatible (VIH = 1.4V, VIL = 0.5V) and tolerate up to +5.5V regardless of V+, supporting mixed-voltage system interfacing. The device supports rail-to-rail analog signals, exhibits -68dB crosstalk and -64dB off-isolation at 100kHz, and delivers 0.03% THD in 20Hz–20kHz audio band.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-Resistance (NO/NC) | 0.8Ω max at +2.7V - ensures minimal voltage drop and power loss in low-voltage audio/power paths |
| RON Match (ΔRON) | 0.06Ω max between channels - preserves signal balance in stereo or differential routing |
| Turn-On / Turn-Off Time | 50ns / 40ns at +3V - enables fast channel switching without audible artifacts or transient glitches |
| THD + Noise | 0.03% at 20Hz–20kHz - meets high-fidelity audio requirements with negligible harmonic distortion |
| Supply Range | +1.8V to +5.5V single supply - supports direct integration into Li-ion, coin-cell, and 3.3V/5V systems |
| Crosstalk / Off-Isolation | -68dB / -64dB at 100kHz - prevents signal coupling between active and inactive channels |
| Charge Injection | 200pC max - limits voltage glitch on COM node during switching, critical for precision DC-coupled paths |
Pinout & Package
The MAX4685ETB+ is housed in a 10-pin TDFN-EP (3mm × 3mm) package with exposed pad (EP), rated for -40°C to +85°C operation. The EP must be connected to GND for thermal and electrical performance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V+ | Positive supply input - powers internal logic and analog switch core; must be applied before analog signals |
| 2 | NO1 | Normally open terminal of Switch 1 - connects to COM1 only when IN1 = logic high |
| 3 | NC1 | Normally closed terminal of Switch 1 - connects to COM1 only when IN1 = logic low |
| 4 | IN1 | Digital control input for Switch 1 - 1.8V logic-compatible; accepts up to +5.5V regardless of V+ |
| 5 | NC2 | Normally closed terminal of Switch 2 - connects to COM2 only when IN2 = logic low |
| 6 | GND | Ground reference for analog and digital sections - EP must also connect to GND |
| 7 | IN2 | Digital control input for Switch 2 - independent of IN1; enables asynchronous dual-channel control |
| 8 | COM2 | Common terminal of Switch 2 - bidirectional I/O node shared between NO2 and NC2 |
| 9 | COM1 | Common terminal of Switch 1 - bidirectional I/O node shared between NO1 and NC1 |
| 10 | NO2 | Normally open terminal of Switch 2 - connects to COM2 only when IN2 = logic high |
Key Features
| Feature | Design Value |
|---|---|
| Break-before-make switching | 2ns guaranteed delay - eliminates momentary shorting between NO and NC paths during transition |
| Rail-to-rail analog signal handling | 0V to V+ range supported - enables full-supply-swing audio and power routing without clipping |
| Low leakage current | ±1nA max at +25°C - preserves battery life and avoids DC offset in high-impedance sensor/audio paths |
| 1.8V logic compatibility | VIH = 1.4V, VIL = 0.5V - allows direct interface with ultra-low-power microcontrollers and FPGAs |
| Exposed thermal pad (EP) | Connected to GND - improves thermal dissipation and reduces junction temperature in high-current routing |
Applications
| Speaker Headset Switching | MP3 Player Audio Routing |
|---|---|
Use Scenario: Dynamically selecting between internal speaker and 3.5mm headset jack in portable media players. IC Role / Device Role / Timing Role: Dual SPDT analog switch routing left/right audio channels with simultaneous break-before-make action to prevent pop/click. Use Value: 0.8Ω RON minimizes insertion loss; 0.03% THD preserves audio fidelity; 50ns switching avoids audible transients. |
Use Scenario: Multiplexing DAC output between headphone amplifier and line-out driver in battery-powered MP3 players. IC Role / Device Role / Timing Role: Low-leakage, rail-to-rail analog switch enabling zero-crossing mute and seamless source selection. Use Value: ±1nA leakage prevents DC bias shift; -68dB crosstalk isolates L/R channels; 1.8V logic compatibility matches baseband processor I/O. |
| Battery Power Path Control | Cellular Phone Antenna Switching |
Use Scenario: Selecting between primary Li-ion battery and backup coin cell in always-on IoT sensors. IC Role / Device Role / Timing Role: Low-RON SPDT switch managing power domain isolation and failover routing. Use Value: 0.8Ω RON limits voltage drop under 100mA load; +1.8V min supply enables operation during brownout; EP enhances thermal reliability. |
Use Scenario: Switching RF front-end between main and diversity antennas in GSM/WCDMA handsets. IC Role / Device Role / Timing Role: High-isolation analog switch routing baseband I/Q signals with minimal signal degradation. Use Value: -64dB off-isolation suppresses antenna coupling; 0.35Ω RON flatness maintains amplitude consistency across 0–3V signal swing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual SPDT analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4684ETB+ | Asymmetrical RON: 0.5Ω (NC) / 0.8Ω (NO) at +2.7V; otherwise identical timing, package, and specs | Better suited for speaker/headset configurations requiring lower RON on NC path (e.g., default speaker path) | Select MAX4684ETB+ if NC-path conduction dominates usage; MAX4685ETB+ preferred for symmetric routing needs. |
| TMUX1574PWR | 0.5Ω RON, 35ns tON, 16-pin TSSOP, 1.2V–5.5V supply - higher speed but larger footprint and no UCSP/TDFN option | Used in industrial test equipment where faster switching and wider supply range outweigh size constraints | Choose TMUX1574PWR only if sub-40ns switching or 1.2V operation is required; MAX4685ETB+ remains optimal for space-constrained portable designs. |
Compared with MAX4684ETB+, the MAX4685ETB+ provides matched NO/NC resistance for balanced channel routing, while TMUX1574PWR offers faster timing and broader voltage support at the cost of board area and thermal performance - making MAX4685ETB+ the preferred choice for miniaturized, battery-powered audio and power-switching applications.
Availability
MAX4685ETB+ is available at Aetrix Electronics and suitable for speaker headset switching, MP3 player audio routing, and battery power path control requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for MAX4685ETB+ 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
Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX4685ETB+ belongs to Maxim's low-voltage analog switch product line, designed specifically for space-constrained, low-power portable electronics requiring high-fidelity signal integrity and robust rail-to-rail operation.
FAQ
What is the maximum supply voltage for the MAX4685ETB+?
The MAX4685ETB+ supports a single supply from +1.8V to +5.5V. Absolute maximum rating is +6V on V+, but operation above +5.5V is not specified and may cause permanent damage. For reliable long-term use, V+ must remain within the 1.8V–5.5V operational range defined in the datasheet Rev 4.
Does the MAX4685ETB+ support rail-to-rail analog signals?
Yes, the MAX4685ETB+ fully supports rail-to-rail analog signal handling from GND to V+. Its BiCMOS architecture maintains low and flat on-resistance across the entire voltage range, enabling undistorted transmission of signals such as audio waveforms or power-domain control voltages without clipping or compression.
What is the function of the exposed pad (EP) on the MAX4685ETB+ TDFN package?
The exposed pad (EP) on the MAX4685ETB+ TDFN package must be soldered to a GND plane. It serves dual purposes: improving thermal dissipation to maintain safe junction temperature under load, and reducing ground impedance for better noise immunity and switching stability. Leaving EP unconnected degrades both thermal and electrical performance.
How does the break-before-make timing work in the MAX4685ETB+?
The MAX4685ETB+ guarantees a minimum 2ns break-before-make delay between NO and NC path disconnection and reconnection. This prevents momentary shorting during logic transitions, which is essential in audio paths to avoid pops and in power routing to prevent backfeeding. The timing is characterized at +2.7V and +25°C per Figure 3 in the datasheet.
Can the MAX4685ETB+ be used with 1.8V logic controllers?
Yes, the MAX4685ETB+ digital inputs are 1.8V logic-compatible: VIH is guaranteed at +1.4V and VIL at +0.5V, with full tolerance up to +5.5V regardless of V+. This allows direct interfacing with low-voltage MCUs, FPGAs, and baseband processors without level-shifting, simplifying PCB design and reducing BOM count.
MAX4685ETB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Switch Circuit:
- SPDT
- Multiplexer/Demultiplexer Circuit:
- 2:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 800mOhm
- Channel-to-Channel Matching (ΔRon):
- 60mOhm (Typ)
- Voltage - Supply, Single (V+):
- 1.8V ~ 5.5V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 50ns, 30ns
- -3db Bandwidth:
- -
- Charge Injection:
- 200pC
- Channel Capacitance (CS(off), CD(off)):
- 84pF, 37pF
- Current - Leakage (IS(off)) (Max):
- 1nA
- Crosstalk:
- -68dB @ 100kHz
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x4)
MAX4685ETB+ FAQ
1.How can I place an order for MAX4685ETB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4685ETB+ 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 MAX4685ETB+ reliable?
The price and inventory of MAX4685ETB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4685ETB+ is usually 5 days.
3.What payment methods are accepted for MAX4685ETB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4685ETB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4685ETB+?
MAX4685ETB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4685ETB+ 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 MAX4685ETB+?
For technical support, including MAX4685ETB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4685ETB+ requirements.
6.How does Aetrix verify that MAX4685ETB+ is sourced from the original manufacturer or authorized distributors?
All MAX4685ETB+ 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 MAX4685ETB+ meets industry standards.
7.What is the process for return or replacement of MAX4685ETB+?
All MAX4685ETB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4685ETB+, 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 MAX4685ETB+ part is unused and in its original packaging.
Return procedure for MAX4685ETB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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