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Analog Devices Inc./Maxim Integrated MAX4909ETD+
- Part No.:
- MAX4909ETD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
MAX4909ETD+.pdf
- Description:
- IC MULTIPLEXER 1 X 3:1 14TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,547
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Product details
Overview
MAX4909ETD+ from Maxim Integrated is a dual 3:1 clickless audio multiplexer with negative-signal handling, supporting analog signal ranges down to VCC − 5.5V, featuring 0.38Ω typical on-resistance, break-before-make switching, and operation from +1.8V to +5.5V supply. It is used in portable audio routing applications such as cell phone headset/microphone path selection.
For engineers reviewing the MAX4909ETD+ datasheet, MAX4909ETD+ pinout, MAX4909ETD+ application, or MAX4909ETD+ equivalent, key selection criteria include negative-signal throughput capability, shunt resistor configuration (absent on X0/Y0), channel matching (≤0.1Ω), PSRR (60dB at 20kHz), and TDFN-EP package compatibility with high-density PCB layouts.
Technical Context
The MAX4909ETD+ implements two independent 3:1 analog multiplexers controlled by CB1/CB2 logic inputs, each selecting one of three bidirectional analog paths (X0/X1/X2 → X; Y0/Y1/Y2 → Y). Its BiCMOS process enables low on-resistance flatness (0.35Ω max) and minimal charge injection (300pC).
Unlike the MAX4908, the MAX4909ETD+ omits internal shunt resistors on X0 and Y0 terminals-reducing pre-discharge during switching for applications where those channels are statically assigned-while retaining shunts on all other inputs (X1/X2/Y1/Y2) to suppress click-and-pop in dynamic selections.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-Resistance | 0.38Ω typ - ensures minimal insertion loss and voltage drop across audio paths at full signal swing |
| Analog Signal Range | VCC − 5.5V to VCC - supports true bipolar audio signals including below-ground levels without clipping |
| Supply Voltage | +1.8V to +5.5V - compatible with single-supply battery-powered systems (e.g., Li-ion, 2×AA) |
| Channel Matching | 0.1Ω max - maintains amplitude balance between parallel signal paths for stereo or differential routing |
| Off-Isolation | −80dB typ at 20kHz - prevents audible crosstalk between unselected and active audio sources |
| PSRR | 60dB at 20kHz - rejects power-supply noise from affecting audio fidelity in noisy digital environments |
| Break-Before-Make Delay | 1ns to 15ns - eliminates momentary shorting between input sources during state transitions |
Pinout & Package
MAX4909ETD+ is housed in a 14-pin TDFN-EP package (3mm × 3mm × 0.8mm), with exposed pad (EP) recommended for grounding to improve thermal performance and reduce ground bounce.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Positive supply input | Accepts +1.8V to +5.5V; powers internal switch array and control logic |
| 2 (X) | X-path common output | Bidirectional analog terminal connecting selected Xn input to system load (e.g., codec input) |
| 3,10 (N.C.) | No connection | Not internally bonded; must be left floating or grounded per layout best practice |
| 4 (X2) | X-path input 2 | Third selectable source for X multiplexer (e.g., auxiliary microphone) |
| 5 (X1) | X-path input 1 | Second selectable source for X multiplexer (e.g., main microphone) |
| 6 (CB1) | Digital control bit 1 | Logic input accepting up to +5.5V regardless of VCC; defines MSB of 2-bit select code |
| 7 (X0) | X-path input 0 | First selectable source for X multiplexer (e.g., headset mic); no internal shunt resistor |
| 8 (GND) | Ground reference | Primary return path for analog and digital currents; connects to EP for optimal noise immunity |
| 9 (Y0) | Y-path input 0 | First selectable source for Y multiplexer (e.g., headset speaker); no internal shunt resistor |
| 11 (Y1) | Y-path input 1 | Second selectable source for Y multiplexer (e.g., earpiece speaker) |
| 12 (Y2) | Y-path input 2 | Third selectable source for Y multiplexer (e.g., loudspeaker output) |
| 13 (CB2) | Digital control bit 2 | Logic input accepting up to +5.5V; defines LSB of 2-bit select code per Table 1 |
| 14 (Y) | Y-path common output | Bidirectional analog terminal connecting selected Yn input to system load (e.g., audio amplifier) |
Key Features
| Feature | Design Value |
|---|---|
| Negative-signal handling | Supports undistorted passage of signals as low as VCC − 5.5V - enables true AC-coupled audio routing without DC biasing circuitry |
| Selective shunt resistor placement | Shunts omitted on X0/Y0 only - preserves fast settling on primary paths while suppressing pop on secondary inputs (X1/X2/Y1/Y2) |
| High PSRR | 60dB at 20kHz - maintains SNR in mixed-signal SoC designs where VCC shares noise with digital cores |
| Low leakage current | ±50nA max on-state, ±200nA off-state at TA = −40°C to +85°C - minimizes DC offset in high-impedance audio interfaces |
| Bidirectional signal flow | Identical RON and capacitance characteristics in either direction - allows flexible use as input selector or output router |
Applications
| Cell Phone Audio Routing | MP3 Player Source Selection |
|---|---|
Use Scenario: Dynamically switching between headset microphone, main microphone, and auxiliary mic in a smartphone during call handover or voice command activation. IC Role / Device Role / Timing Role: Dual-path analog multiplexer providing simultaneous, glitch-free routing of mic and speaker signals under real-time CPU control via CB1/CB2. Use Value: Eliminates audible clicks during mode transitions using break-before-make timing and selective shunt discharge on non-X0/Y0 inputs. | Use Scenario: Selecting among line-in, internal DAC output, and Bluetooth audio stream for playback in a portable media player. IC Role / Device Role / Timing Role: Low-RON analog switch enabling transparent signal pass-through with <0.02% THD across full 20Hz–20kHz bandwidth. Use Value: Preserves audio fidelity while supporting VCC as low as +1.8V - extends battery life without compromising dynamic range. |
| Notebook Computer Audio Jack Sharing | PDA Stereo Path Management |
Use Scenario: Sharing a single 3.5mm combo jack between microphone and headphones in ultrabook designs with space-constrained layouts. IC Role / Device Role / Timing Role: Dual 3:1 mux isolating mic and speaker paths while maintaining DC continuity for jack detection circuits. Use Value: −80dB off-isolation prevents speaker bleed into mic path; 200pF off-capacitance avoids high-frequency roll-off in jack detection RC networks. | Use Scenario: Managing left/right audio channels and accessory detection in handheld PDAs with multiple audio peripherals (headset, speaker, recording mic). IC Role / Device Role / Timing Role: Bidirectional analog switch supporting both input and output roles per channel pair (X/Y) under software-defined configuration. Use Value: 0.35Ω on-resistance flatness ensures consistent gain matching across volume control ranges and temperature extremes (−40°C to +85°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 3:1 analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4908ETD+ | Includes shunt resistors on all inputs (X0/Y0 included); higher click suppression but slightly higher leakage on X0/Y0 | Better suited for fully dynamic switching where all inputs may be reconfigured; less ideal when X0/Y0 are fixed assignments | Choose MAX4908ETD+ if uniform click suppression across all inputs is required; MAX4909ETD+ preferred when X0/Y0 are static and speed/noise matter more |
| TMUX1308RSVR | Single 8:1 mux (not dual 3:1); 0.5Ω on-resistance; no negative-signal capability (min input = GND) | Requires external logic to emulate dual-path behavior; cannot handle VCC − 5.5V signals | Only viable if system redesign accommodates single-mux topology and all signals stay ≥ GND; not drop-in compatible |
Compared with MAX4908ETD+, the MAX4909ETD+ trades uniform click suppression for lower X0/Y0 leakage and faster settling on primary paths; versus TMUX1308RSVR, it delivers true negative-signal routing and native dual-channel control without glue logic or level-shifting.
Availability
MAX4909ETD+ is available at Aetrix Electronics and suitable for cell phone audio routing, MP3 player source selection, and notebook computer audio jack sharing requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX4909ETD+ 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 precision analog, mixed-signal, and high-reliability ICs for industrial, communications, and consumer applications.
The MAX4908/MAX4909 product line was designed specifically for low-distortion, low-power audio signal routing in space-constrained portable electronics - emphasizing clickless switching, wide supply range, and robust negative-signal handling.
FAQ
What is the maximum allowable analog input voltage for MAX4909ETD+ relative to VCC?
The MAX4909ETD+ supports analog input voltages from VCC − 5.5V to VCC. For example, with VCC = +3.3V, inputs may swing from −2.2V to +3.3V without distortion or clipping. This capability enables direct interface with AC-coupled audio sources without external biasing networks, preserving signal integrity and reducing BOM count.
Does MAX4909ETD+ require external pull-up or pull-down resistors on CB1 and CB2 control pins?
No, MAX4909ETD+ does not require external biasing on CB1 or CB2. These inputs accept rail-to-rail logic levels up to +5.5V independent of VCC and exhibit ≤±1µA leakage. With VCC = +2.7V, VIH = +1.4V and VIL = +0.5V - compatible with standard 1.8V/3.3V GPIOs without level shifters.
How does the absence of shunt resistors on X0 and Y0 affect MAX4909ETD+ performance in audio applications?
The absence of shunt resistors on X0 and Y0 reduces off-state leakage and improves settling time on those primary paths, making them ideal for statically assigned signals like headset microphone (X0) and speaker (Y0). Click-and-pop suppression remains effective on X1/X2/Y1/Y2 via their integrated 3.8kΩ shunts, balancing performance and flexibility.
Can MAX4909ETD+ be used in bidirectional signal paths, such as connecting a codec to either a microphone or speaker?
Yes, MAX4909ETD+ supports fully bidirectional operation: X and Y common terminals function identically as inputs or outputs, with matched on-resistance (0.38Ω typ), flatness (0.35Ω max), and capacitance (450pF on-state). This allows reuse of the same device for mic input selection and speaker output routing in compact audio subsystems.
What is the thermal performance of MAX4909ETD+ in its TDFN-EP package at maximum ambient temperature?
In a multilayer PCB configuration, the MAX4909ETD+ TDFN-EP package delivers 1951mW continuous power dissipation at TA = +70°C, derating at 24.4mW/°C above that point. At TA = +85°C, usable power dissipation is ~1585mW - sufficient for typical audio switching (≤100mA per path) with margin, especially when EP is soldered to a thermal pad.
MAX4909ETD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Multiplexer
- Circuit:
- 1 x 3:1
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TDFN-EP (3x3)
MAX4909ETD+ FAQ
1.How can I place an order for MAX4909ETD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4909ETD+ 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 MAX4909ETD+ reliable?
The price and inventory of MAX4909ETD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4909ETD+ is usually 5 days.
3.What payment methods are accepted for MAX4909ETD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4909ETD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4909ETD+?
MAX4909ETD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4909ETD+ 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 MAX4909ETD+?
For technical support, including MAX4909ETD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4909ETD+ requirements.
6.How does Aetrix verify that MAX4909ETD+ is sourced from the original manufacturer or authorized distributors?
All MAX4909ETD+ 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 MAX4909ETD+ meets industry standards.
7.What is the process for return or replacement of MAX4909ETD+?
All MAX4909ETD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4909ETD+, 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 MAX4909ETD+ part is unused and in its original packaging.
Return procedure for MAX4909ETD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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