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Analog Devices Inc./Maxim Integrated MAX1932ETC+G035
- Part No.:
- MAX1932ETC+G035
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- -
- Datasheet:
-
MAX1932ETC+G035.pdf
- Description:
- INTEGRATED CIRCUIT
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Product details
Overview
MAX1932ETC+G035 from Maxim Integrated is a digitally controlled, high-voltage DC-DC boost controller IC designed specifically to generate precise, low-noise bias voltage for avalanche photodiodes (APDs) in optical receivers. It delivers 0.5% output voltage accuracy, <1mV output ripple, and 4.5V–90V programmable output range using an internal 8-bit SPI-compatible DAC or external resistors - enabling safe, stable APD operation in fiber-optic telecom and laser ranging systems.
For engineers reviewing the MAX1932ETC+G035 datasheet, MAX1932ETC+G035 pinout, MAX1932ETC+G035 application, or MAX1932ETC+G035 equivalent, key selection considerations include its integrated high-side current-limit protection with avalanche indicator flag (CL), constant-frequency PWM architecture (240–360 kHz), 12-pin 4mm × 4mm thin QFN package, and support for post-filter compensation (RC/LC) inside the feedback loop.
Technical Context
The MAX1932ETC+G035 implements a fixed-frequency PWM control scheme driving an external N-channel MOSFET via the GATE pin, with regulation maintained by a precision 1.25V FB reference and transconductance error amplifier (50–200 µS). Its unique feedback architecture allows optional RC or LC filtering *inside* the control loop - improving stability while preserving transient response and output accuracy.
It integrates a dedicated current-sense path across CS+/CS− with 2.00 V ±0.20 V threshold and ±0.005%/V common-mode rejection, plus a logic-level CL flag that asserts low precisely at avalanche onset. The internal 8-bit DAC (DACOUT) provides monotonic 1.25V/256 LSB resolution and supports full-scale output voltage programming from 4.5V to 90V with independent span/offset adjustment via external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 4.5V to 90V - fully programmable via DACOUT or external resistor divider; supports narrow ranges like 4.5V–15V or 40V–90V without DAC resolution waste. |
| Output Accuracy | ±0.5% - guaranteed over -40°C to +85°C, enabled by 1.2500 V ±0.0075 V FB reference and low FB bias current (±30 nA). |
| Output Ripple | <1 mV (AC-coupled) - achieved via constant-frequency PWM (240–360 kHz) and optional integrated RC/LC post-filter in feedback path. |
| Current Limit Threshold | 2.00 V ±0.20 V differential at CS+/CS− - enables accurate, temperature-stable APD overcurrent protection with ±0.005%/V CMRR. |
| DAC Resolution & Interface | 8-bit SPI-compatible serial interface (2 MHz max SCLK); monotonic DACOUT with ±1 LSB DNL and ±4 mV offset vs FB at FF hex. |
| Supply Input Range | 2.7V to 5.5V - compatible with standard 3.3V or 5V system rails; includes 2.1V–2.6V UVLO with 100 mV hysteresis. |
| Operating Temperature | -40°C to +85°C - specified and production-tested across full range; junction limit 150°C. |
Pinout & Package
MAX1932ETC+G035 is housed in a 12-pin, 4mm × 4mm, 0.75mm height thin QFN package (TQFN-12) with exposed thermal pad. Pin 9 is GND; pins 11 (VIN) and 9 (GND) require local 1µF ceramic bypassing. The package is RoHS-compliant and optimized for low-profile optical module integration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SCLK | SPI clock input | Accepts up to 2 MHz clock; synchronizes 8-bit DAC register writes; edge-triggered, 125 ns min pulse width. |
| 2 DIN | SPI data input | Serial data stream for DAC code (00–FF hex); latched on SCLK rising edge; 0–1.4 V logic-high threshold. |
| 3 CL | Avalanche indicator flag | Open-drain output; pulls low when CS+/CS− differential ≥2.00 V - signals precise APD breakdown point for calibration. |
| 4 CS+ | High-side current sense (+) | Connects to APD anode side of sense resistor; 1 MΩ typical resistance to GND; rejects common-mode voltage up to +110 V. |
| 5 CS− | High-side current sense (−) | Connects to APD cathode side of sense resistor; matched 1 MΩ resistance to GND; enables accurate high-side current limiting. |
| 6 DACOUT | Internal DAC output | Provides 1.25V × (code/256) + 1.25V/256 control voltage; sources/sinks 50 µA; drives FB through R6 for adjustable output. |
| 7 FB | Voltage feedback input | 1.25V reference node; accepts resistive divider from VOUT; ±30 nA bias current minimizes ratio error in high-impedance dividers. |
| 8 COMP | Error amplifier compensation | Connects RC network (e.g., 20 kΩ + 0.22 µF) to GND; sets dominant pole and zero for loop stability with post-filter configurations. |
| 9 GND | Analog/digital ground | Single ground reference for all circuitry; must be low-impedance; connects directly to thermal pad for thermal management. |
| 10 GATE | External N-FET gate driver | Drives gate of external N-channel MOSFET; 5–10 Ω on-resistance; supports fast switching with 3 µs max on-time. |
| 11 VIN | IC supply input | 2.7–5.5 V power for internal circuitry; requires local 1 µF ceramic bypass capacitor placed adjacent to pin. |
| 12 CS | SPI chip select | Active-low enable for SPI interface; 300 ns minimum high period; controls DAC write and shutdown command acceptance. |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% output voltage accuracy | Guaranteed over -40°C to +85°C via precision 1.25V FB reference (±0.0075 V) and low-drift error amplifier - critical for APD gain stability. |
| Integrated avalanche indicator (CL) | Logic-level flag that asserts low *exactly* at current-limit threshold (2.00 V ±0.20 V), enabling precise APD operating-point calibration without external comparators. |
| Post-filter compensation support | Feedback loop accommodates RC or LC filter *between CS− and FB*, allowing ripple reduction without sacrificing control-loop bandwidth or stability. |
| Independent DAC span/offset control | External resistors R5/R8 set output range boundaries (e.g., 4.5V–45V) - maximizes effective DAC resolution for narrow-range applications. |
| High-side current sensing | CS+/CS− inputs tolerate up to +110 V common-mode voltage and reject >99.995% of common-mode variation - eliminates need for isolated sense amplifiers. |
Applications
| Fiber-Optic Receiver Modules | Laser Range Finders |
|---|---|
|
Use Scenario: Biasing APDs in 10G/25G SFP+ and QSFP transceivers for high-sensitivity optical signal detection in metro and access networks. IC Role / Device Role / Timing Role: High-voltage DC-DC controller generating stable, low-noise 40–70 V bias; regulates via FB node referenced after current-sense resistor for optimal accuracy. Use Value: 0.5% output accuracy and <1 mV ripple ensure consistent APD quantum efficiency and minimize bit-error-rate (BER) drift across temperature and aging. |
Use Scenario: Providing calibrated high-voltage bias to APDs in time-of-flight (ToF) laser rangefinders used in industrial automation and surveying equipment. IC Role / Device Role / Timing Role: Digitally programmable APD supply with CL flag enabling real-time avalanche-point tracking during environmental calibration cycles. Use Value: SPI-controlled DACOUT allows firmware-based temperature compensation (e.g., +0.1 V/°C) to maintain APD responsivity across -40°C to +85°C operating range. |
| Telecom Line Cards | PIN Diode Bias Supply |
|
Use Scenario: Generating 60–90 V bias for APDs in DWDM optical line cards requiring long-haul signal reception with ultra-low noise floor. IC Role / Device Role / Timing Role: Boost controller with integrated high-side current limit protecting expensive APDs during fault conditions (e.g., fiber disconnect, ESD event). Use Value: Accurate 2.00 V current-limit threshold and CL flag reduce need for redundant protection circuitry - lowering BOM count and board area. |
Use Scenario: Repurposed as a precision high-voltage bias source for PIN diodes in RF switch matrices and optical attenuators. IC Role / Device Role / Timing Role: Programmable DC-DC supply delivering 5–30 V with 0.5% accuracy and low ripple - replacing discrete op-amp/DAC solutions. Use Value: Internal 8-bit DAC and resistor-based span/offset configuration eliminate external DAC and trimming components - reducing design cycle time. |
Availability
MAX1932ETC+G035 is available at Aetrix Electronics and suitable for fiber-optic receiver modules, laser rangefinders, and telecom line cards requiring stable component supply, long-term lifecycle support, and traceable sourcing for optical subsystem qualification.
Supply support for MAX1932ETC+G035 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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for precision, high-reliability applications.
The MAX1932ETC+G035 belongs to Maxim's APD bias supply product line, engineered specifically for optical receiver safety, accuracy, and programmability - addressing the stringent voltage stability, noise, and protection requirements of next-generation fiber infrastructure.
FAQ
What is the primary function of the MAX1932ETC+G035 in optical systems?
The MAX1932ETC+G035 functions as a digitally controlled, high-voltage DC-DC boost controller optimized for biasing avalanche photodiodes (APDs). It generates a precise, low-noise output (4.5V–90V) with 0.5% accuracy and <1mV ripple, using internal 8-bit DAC or external resistors. Its integrated high-side current limit and CL flag protect APDs during avalanche conditions - making MAX1932ETC+G035 essential for stable, calibrated optical receiver performance in telecom and sensing applications.
How does the CL pin on the MAX1932ETC+G035 improve APD calibration?
The CL (Current-Limit) pin on the MAX1932ETC+G035 is an open-drain logic flag that asserts low *exactly* when the CS+/CS− differential voltage reaches the 2.00 V ±0.20 V current-limit threshold - indicating the precise onset of APD avalanche breakdown. This enables direct, real-time calibration of the APD operating point without external comparators or test equipment. In practice, firmware monitors CL during DACOUT sweeps to lock the bias voltage at the optimal gain/noise trade-off - a capability uniquely provided by MAX1932ETC+G035 among APD bias controllers.
Can the MAX1932ETC+G035 operate with an external DAC instead of its internal one?
Yes, the MAX1932ETC+G035 supports external DAC control via the DACOUT pin, which accepts any voltage source (0–2.5 V typical) to set the output voltage. When using an external DAC, the internal 8-bit DAC is disabled, and DACOUT operates as a high-impedance input node. The device retains full functionality - including 0.5% accuracy, CL flag, and high-side current sensing - with external control offering higher resolution or custom transfer functions. This flexibility makes MAX1932ETC+G035 adaptable to legacy systems or specialized calibration architectures.
What package type and thermal characteristics does the MAX1932ETC+G035 use?
The MAX1932ETC+G035 uses a 12-pin thin QFN package (4mm × 4mm, 0.75mm height) with exposed thermal pad, designated T1244-4 per Maxim's package outline. Its thermal resistance θJA is 74°C/W (typical), and maximum continuous power dissipation at +70°C is 1349 mW, derating 16.9 mW/°C above that. The low-profile, thermally enhanced QFN enables compact placement in space-constrained optical modules while maintaining reliable operation up to +85°C ambient - a key requirement validated in MAX1932ETC+G035 production testing.
Does the MAX1932ETC+G035 support post-filtering inside the feedback loop, and why does it matter?
Yes, the MAX1932ETC+G035 explicitly supports RC or LC post-filtering *inside* the feedback loop - by connecting the filter between CS− and FB (Figure 2). This architecture reduces output ripple and noise without degrading control-loop stability or transient response, unlike conventional post-filtering outside the loop. For example, adding a 330 µH / 1 µF LC filter cuts measured ripple to <1 mV while maintaining phase margin >45° - a design advantage confirmed in MAX1932ETC+G035 typical operating characteristics and critical for low-BER optical links.
MAX1932ETC+G035 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Applications:
- -
- Voltage - Input:
- -
- Number of Outputs:
- -
- Voltage - Output:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX1932ETC+G035 FAQ
1.How can I place an order for MAX1932ETC+G035 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1932ETC+G035 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 MAX1932ETC+G035 reliable?
The price and inventory of MAX1932ETC+G035 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1932ETC+G035 is usually 5 days.
3.What payment methods are accepted for MAX1932ETC+G035?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1932ETC+G035 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1932ETC+G035?
MAX1932ETC+G035 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1932ETC+G035 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 MAX1932ETC+G035?
For technical support, including MAX1932ETC+G035 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1932ETC+G035 requirements.
6.How does Aetrix verify that MAX1932ETC+G035 is sourced from the original manufacturer or authorized distributors?
All MAX1932ETC+G035 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 MAX1932ETC+G035 meets industry standards.
7.What is the process for return or replacement of MAX1932ETC+G035?
All MAX1932ETC+G035 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1932ETC+G035, 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 MAX1932ETC+G035 part is unused and in its original packaging.
Return procedure for MAX1932ETC+G035:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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