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Analog Devices Inc./Maxim Integrated MAX1444EHJ+T
- Part No.:
- MAX1444EHJ+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-TQFP
- Datasheet:
-
MAX1444EHJ+T.pdf
- Description:
- IC ADC 10BIT PIPELINED 32TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,325
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Product details
Overview
MAX1444EHJ+T from Maxim Integrated is a 10-bit, 40Msps analog-to-digital converter with pipelined architecture, fully differential track-and-hold input, and on-chip 2.048V precision bandgap reference. It operates from a single 2.7V–3.6V supply, delivers 59.5dB SNR at 20MHz input, and consumes only 19mA in normal operation. It targets high-dynamic-performance imaging and communications systems including ultrasound and CCD digitization.
For engineers reviewing the MAX1444EHJ+T datasheet, MAX1444EHJ+T pinout, MAX1444EHJ+T application, or MAX1444EHJ+T equivalent, this page provides verified technical context, real-world interface constraints, validated alternative options, and design-meaningful specifications - all grounded in the official MAX1444 datasheet Rev 3 (8/2010) and Maxim's product documentation.
Technical Context
The MAX1444EHJ+T implements a 10-stage pipelined ADC architecture with 1.5-bit flash quantizers per stage and digital error correction, achieving 5.5 clock-cycle latency. Its fully differential signal path supports both differential and single-ended analog inputs, with 400MHz –3dB input bandwidth and ±1.0V differential input range referenced to COM.
It integrates a buffered internal reference (REFOUT = 2.048V ±1%) with 60ppm/°C tempco and supports three reference modes: internal, buffered external, and unbuffered external. Digital outputs are CMOS-compatible three-state, operating from 1.7V–3.6V OVDD, with timing synchronized to the falling edge of CLK and data valid on the rising edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - defines 1024 discrete output codes for precise amplitude quantization in baseband/IF digitization. |
| Sampling Rate | 40Msps - enables Nyquist-limited digitization of signals up to 20MHz, suitable for ultrasound and video IF bands. |
| SNR @ 20MHz | 59.5dB typical - translates to ~9.9 effective bits (ENOB), critical for maintaining signal fidelity in CCD imaging. |
| Input Bandwidth | 400MHz –3dB (differential) - supports wideband RF sampling and undersampling applications without external amplification. |
| Power Consumption | 19mA at VDD = 3V - enables low-thermal-load designs in space-constrained medical or portable imaging modules. |
| Reference Voltage | 2.048V ±1% - provides stable full-scale range; temperature coefficient of 60ppm/°C ensures <±0.5% drift over –40°C to +85°C. |
| Shutdown Current | 5µA - allows rapid power gating during idle periods in battery-powered or duty-cycled systems. |
Pinout & Package
The MAX1444EHJ+T is housed in a 5×5mm, 32-pin TQFP package (JEDEC MO-220 variant) with exposed pad for thermal dissipation, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN− | Differential analog input pair | Accepts ±1.0V differential signal; common-mode voltage set to VDD/2 via COM; supports single-ended drive when IN− tied to COM. |
| REFP, REFN, COM | Reference voltage terminals | Define full-scale range as ±(REFP − REFN); COM = VDD/2; REFP/REFN buffered outputs enable external reference configuration. |
| REFIN, REFOUT | Reference control interface | REFIN accepts external reference voltage (2.048V typical); REFOUT provides internal 2.048V reference for feedback or system-level biasing. |
| CLK | Sampling clock input | CMOS-compatible; sampling occurs on falling edge; requires low-jitter source (<2ps RMS) to preserve 59.5dB SNR at high fIN. |
| PD, OE | Power and output control | PD high enters 5µA shutdown; OE high disables D9–D0 outputs into high-impedance state, isolating digital noise from analog section. |
| D9–D0 | Parallel digital outputs | Offset binary, three-state CMOS outputs; OVDD-supplied (1.7–3.6V) for flexible interfacing with FPGAs or ASICs; 5.5-cycle latency from sample to valid data. |
Key Features
| Feature | Design Value |
|---|---|
| Pipelined 10-stage architecture | Enables 40Msps throughput with low power (57mW total) and deterministic 5.5-cycle latency for real-time pipeline synchronization. |
| Fully differential T/H input | Rejects common-mode noise and even-order harmonics; supports >400MHz small-signal bandwidth for RF undersampling applications. |
| On-chip 2.048V reference | Eliminates external reference IC; ±1% initial accuracy and 60ppm/°C drift ensure stable full-scale across industrial temperature range. |
| Flexible reference configuration | Supports internal, buffered external, or unbuffered external reference modes - enabling custom full-scale ranges or improved accuracy via precision external sources. |
| CMOS-compatible three-state outputs | Allows direct connection to 1.7–3.6V logic families; OE-controlled tri-state prevents bus contention and reduces digital switching noise coupling into analog sections. |
Applications
| Ultrasound Imaging | CCD Imaging |
|---|---|
Use Scenario: Digitizing echo return signals from piezoelectric transducers in portable or cart-based ultrasound systems. IC Role / Device Role / Timing Role: Primary ADC capturing 5–15MHz RF echoes with high SNR and low THD to preserve tissue contrast resolution. Use Value: 59.5dB SNR at 20MHz and 74dBc SFDR enable detection of low-amplitude deep-tissue structures without post-processing gain penalty. | Use Scenario: Converting analog pixel charge outputs from linear or area CCD sensors in industrial inspection cameras. IC Role / Device Role / Timing Role: High-speed digitizer synchronized to CCD line rate, accepting differential analog outputs directly from correlated double samplers. Use Value: 400MHz input bandwidth and ±1.0V differential range match typical CCD output swing and settling behavior, minimizing front-end amplification. |
| Baseband & IF Digitization | Digital Set-Top Boxes |
Use Scenario: Sampling baseband I/Q signals or intermediate frequency (IF) outputs in software-defined radio (SDR) receivers. IC Role / Device Role / Timing Role: Direct-conversion ADC for zero-IF or low-IF architectures, supporting undersampling of 20–40MHz IF bands. Use Value: Aperture jitter of 2ps RMS and 500MHz small-signal bandwidth maintain SFDR >72dBc even at 39.9MHz input, critical for adjacent-channel rejection. | Use Scenario: Digitizing composite video or component Y/C signals in legacy digital cable or satellite STB front ends. IC Role / Device Role / Timing Role: Video ADC handling 13.5MHz luminance and 6.75MHz chrominance sampling per ITU-R BT.601. Use Value: Single 3V supply, low 19mA current, and integrated reference simplify power and layout in cost-sensitive consumer PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-power ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1446EHJ+T | 60Msps sampling rate; same 10-bit resolution, pin-compatible TQFP-32 package, identical reference and interface architecture. | Targeted at higher IF frequencies (e.g., 30MHz LTE uplink sampling); requires faster clock and higher OVDD drive capability. | Select when system clock budget supports ≥60MHz and SNR >58dB at fIN >25MHz is required; no PCB change needed. |
| ADS5271IPFP | 10-bit, 40Msps, but uses LVDS outputs (not CMOS), different pinout, no integrated reference, requires external 2.048V reference. | Better suited for noise-sensitive, long-trace FPGA interfaces; lacks internal reference flexibility and single-supply simplicity. | Choose for systems prioritizing LVDS EMI immunity and already using external precision references; board redesign required. |
Compared with MAX1444EHJ+T, the MAX1446EHJ+T offers higher speed with identical footprint and power profile, while the ADS5271IPFP trades integrated reference and CMOS simplicity for LVDS noise resilience - making MAX1444EHJ+T optimal for cost- and space-constrained 3V imaging and communications front ends.
Availability
MAX1444EHJ+T is available at Aetrix Electronics and suitable for ultrasound imaging systems, CCD-based machine vision, digital set-top box front ends, and IF digitization modules requiring stable component supply, industrial temperature support, and RoHS-compliant packaging.
Supply support for MAX1444EHJ+T 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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX1444EHJ+T belongs to Maxim's high-speed data converter family, engineered specifically for low-power, high-SNR digitization in portable and embedded imaging and communications equipment where supply headroom and thermal envelope are constrained.
FAQ
What is the maximum analog input frequency supported by the MAX1444EHJ+T?
The MAX1444EHJ+T features a 400MHz –3dB full-power input bandwidth in differential mode, enabling reliable sampling of analog signals up to 40MHz for undersampling applications. At 20MHz input frequency, it maintains 59.5dB SNR and 74dBc SFDR per the datasheet (Rev 3, p.3). Performance degrades gradually beyond 40MHz due to bandwidth roll-off, not hard cutoff.
Does the MAX1444EHJ+T require an external reference voltage?
No - the MAX1444EHJ+T includes an on-chip 2.048V ±1% precision bandgap reference (REFOUT) that sets the full-scale range. REFOUT can be connected to REFIN via a 10kΩ resistor for internal reference mode. External reference is optional and used only when higher accuracy or non-standard input ranges are needed.
What is the power-down current of the MAX1444EHJ+T and how is it activated?
The MAX1444EHJ+T draws just 5µA in power-down mode, achieved by driving the PD pin high while OE remains high or low. In this state, analog circuitry is disabled, reference buffers are shut down, and digital outputs enter high-impedance. Wake-up time is 1.7µs (datasheet p.5), allowing rapid resumption of conversion.
Can the MAX1444EHJ+T accept single-ended analog inputs?
Yes - the MAX1444EHJ+T supports single-ended operation: connect the signal to IN+, tie IN− to COM, and ensure COM is at VDD/2 (provided internally). However, differential drive yields superior SFDR (>74dBc vs. ~72dBc) and lower THD, especially above 10MHz, due to common-mode noise rejection.
What digital interface voltage levels are compatible with the MAX1444EHJ+T outputs?
The MAX1444EHJ+T D9–D0 outputs are CMOS-compatible three-state drivers powered by OVDD (1.7V–3.6V). VOH = OVDD – 0.2V and VOL = 0.2V at 200µA load, making them directly interoperable with 1.8V, 2.5V, and 3.3V logic families without level shifters - provided OVDD matches the host interface voltage.
MAX1444EHJ+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 32-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 40M
- Number of Inputs:
- 1
- Input Type:
- Differential, Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Pipelined
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 32-TQFP (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1444EHJ+T FAQ
1.How can I place an order for MAX1444EHJ+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1444EHJ+T 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 MAX1444EHJ+T reliable?
The price and inventory of MAX1444EHJ+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1444EHJ+T is usually 5 days.
3.What payment methods are accepted for MAX1444EHJ+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1444EHJ+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1444EHJ+T?
MAX1444EHJ+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1444EHJ+T 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 MAX1444EHJ+T?
For technical support, including MAX1444EHJ+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1444EHJ+T requirements.
6.How does Aetrix verify that MAX1444EHJ+T is sourced from the original manufacturer or authorized distributors?
All MAX1444EHJ+T 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 MAX1444EHJ+T meets industry standards.
7.What is the process for return or replacement of MAX1444EHJ+T?
All MAX1444EHJ+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1444EHJ+T, 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 MAX1444EHJ+T part is unused and in its original packaging.
Return procedure for MAX1444EHJ+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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