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Analog Devices Inc./Maxim Integrated MAX158BCAI+T
- Part No.:
- MAX158BCAI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX158BCAI+T.pdf
- Description:
- IC ADC 8BIT FLASH 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,988
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Product details
Overview
The MAX158BCAI+T from Maxim Integrated is an 8-bit, 8-channel high-speed analog-to-digital converter (ADC) with integrated track/hold, on-chip 2.5V reference, and single +5V supply operation. It delivers 2.5µs per-channel conversion time, ±1/2 LSB total unadjusted error, and supports microprocessor interface via CS/RD control without external logic. It is used in real-time speech analysis, telecom channel monitoring, and high-speed servo feedback loops.
For engineers reviewing the MAX158BCAI+T datasheet, MAX158BCAI+T pinout, MAX158BCAI+T application, or MAX158BCAI+T equivalent, this page provides verified technical context, package-validated pin functions, real-world application cards, and two confirmed alternative parts with documented functional and layout implications.
Technical Context
The MAX158BCAI+T employs a half-flash architecture with dual 4-bit flash ADC sections and an internal DAC to generate 8-bit results using 31 comparators. Its conversion sequence is initiated by falling edges of CS and RD, with INT signaling completion after ~600ns and full data validity at 2.5µs.
It operates in two digital interface modes: Mode 0 (WAIT-state compatible, RD held low until conversion completes) and Mode 1 (non-WAIT, RD pulse initiates new conversion while outputting prior result). The device uses an internal 2.5V reference buffered at REF OUT, with VREF+ and VREF− pins enabling flexible external reference configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes for precise amplitude quantization in signal acquisition. |
| Conversion Time | 2.5 µs per channel - enables up to 400 kHz aggregate sampling rate (MAX158), supporting >10 kHz input bandwidth per Nyquist. |
| Total Unadjusted Error | ±1/2 LSB - ensures monotonicity and no missing codes across full temperature range (0°C to +70°C). |
| Reference Output | 2.50 V ±3 mV - stable internal voltage source eliminates need for external precision reference in cost-sensitive designs. |
| Analog Input Range | 0 V to +5 V - matches standard +5V system rails and simplifies sensor interfacing without level-shifting. |
| Supply Voltage | +5 V ±5% - operates directly from common logic supply, reducing power rail complexity. |
| Input Capacitance | 45 pF - defines required source impedance ≤100 Ω for full-scale settling within 1 µs acquisition window. |
Pinout & Package
MAX158BCAI+T is housed in a 28-pin shrink small-outline package (SSOP), 5.6 mm × 10.2 mm body size, 0.65 mm lead pitch, gull-wing leads, RoHS-compliant matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, 23–28 | AIN1–AIN8 | Eight single-ended analog input channels; multiplexed under A0/A1/A2 address control. |
| 5, 6 | A0, A1 | Channel address inputs (LSB/MSB); A2 is NC on MAX158BCAI+T per pin diagram. |
| 7 | REF OUT | 2.5 V buffered reference output; requires 0.01 µF bypass to GND for stability. |
| 8, 9 | VREF−, VREF+ | Reference span endpoints; define zero-code (VREF−) and full-scale (VREF+) input voltages. |
| 10 | RDY | Open-drain ready indicator; connects to µP WAIT input; pulled high externally when active. |
| 11 | INT | Active-low interrupt; asserts ~600 ns after CS/RD edge, latching lower 4 bits at completion. |
| 12 | CS | Chip-select input; must be low to enable conversion and data access; controls RDY behavior. |
| 13 | RD | Read control; falling edge initiates conversion in Mode 0; pulse width ≥80 ns in Mode 1. |
| 14–21 | DB0–DB7 | Latched, three-state data outputs (LSB to MSB); directly interface to 8-bit µP data bus. |
| 22 | GND | Analog ground reference; separate from digital ground in layout-critical applications. |
| 24 | VDD | +5 V supply pin; requires 47 µF electrolytic + 0.1 µF ceramic bypass to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates external TH circuitry and associated board space, timing skew, and distortion sources. |
| On-chip 2.5 V reference | Reduces BOM count and improves system-level accuracy vs. external references subject to layout noise. |
| Single +5 V supply | Removes need for dual-rail supplies or charge pumps, lowering power design complexity and cost. |
| No external clock required | Internal timing control simplifies system clock tree and avoids clock routing noise coupling into analog path. |
| Memory-mapped or I/O-port interface | Enables direct connection to 8051, Z80, or x86 buses without glue logic or address decoding. |
Applications
| Telecom Channel Monitoring | Digital Signal Processing |
|---|---|
Use Scenario: Real-time digitization of multiple voice-band channels in PBX or VoIP gateway front-ends. IC Role / Device Role / Timing Role: 8-channel simultaneous-sampling ADC providing synchronized 8-bit samples at 400 kSPS aggregate rate. Use Value: Enables parallel processing of 8 independent signals with <2.5 µs latency per channel, meeting ITU-T G.711 timing constraints. |
Use Scenario: Acquisition stage in FPGA-based spectral analysis or adaptive filtering engines. IC Role / Device Role / Timing Role: High-throughput analog front-end feeding streaming data to DSP cores via parallel bus. Use Value: Delivers deterministic 2.5 µs conversion with latched outputs, eliminating FIFO buffering and reducing pipeline stalls. |
| High-Speed Servo Control | Audio Instrumentation |
Use Scenario: Position and current feedback sampling in industrial motor drives operating at >20 kHz PWM frequencies. IC Role / Device Role / Timing Role: Multi-channel ADC capturing encoder, current-sense, and thermal sensor data within one control cycle. Use Value: 2.5 µs per-channel speed allows full 8-sensor readout in <20 µs-well within typical 50 µs servo loop windows. |
Use Scenario: Multi-track audio level metering and clipping detection in professional mixing consoles. IC Role / Device Role / Timing Role: Simultaneous sampling of 8 line-level inputs with 0–5 V range compatibility. Use Value: Internal 2.5 V reference and ±1/2 LSB error ensure consistent gain tracking across all channels without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit multi-channel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.4 µs conversion, SPI interface, no internal reference, 8-channel but requires external REF. | Requires external 2.5 V reference and level-shifting for +5 V µP interface; not pin-compatible. | Select when SPI bus integration is preferred over parallel interface and reference flexibility is needed. |
| MAX1113ECM+ | 8-bit, 4-channel, 2.5 µs conversion, same SSOP-28 package, but only 4 inputs and no built-in track/hold. | Limited to 4 analog inputs; external track/hold required for multi-channel sync; shares footprint but not functionally equivalent. | Choose only if channel count is reduced and external TH is acceptable; not a drop-in replacement. |
Compared with MAX158BCAI+T, ADS7822U trades parallel simplicity for serial flexibility and higher layout density, while MAX1113ECM+ reduces channel count and adds external component burden-neither offers identical 8-channel, self-contained, +5V-native functionality.
Availability
MAX158BCAI+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial servo systems, and audio test equipment requiring stable component supply, long-term production continuity, and guaranteed SSOP-28 sourcing.
Supply support for MAX158BCAI+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, automotive, and communications applications.
The MAX154/MAX158 product line was engineered for high-speed, multi-channel data acquisition in space-constrained systems where integration of reference, track/hold, and parallel interface reduces system-level complexity and cost.
FAQ
What is the maximum sampling rate achievable with the MAX158BCAI+T?
The MAX158BCAI+T achieves a maximum aggregate sampling rate of 400 kHz, calculated from its 2.5 µs conversion time plus 500 ns minimum delay between conversions. This supports up to 50 kHz per channel across all eight inputs, satisfying Nyquist criteria for 10 kHz analog bandwidth applications without external anti-aliasing complexity.
Does the MAX158BCAI+T require an external clock signal?
No, the MAX158BCAI+T does not require an external clock. All timing-including conversion initiation, track/hold control, and data latching-is generated internally. The device relies solely on CS and RD control signals, eliminating clock distribution challenges and jitter sensitivity in noise-critical analog acquisition paths.
Can the MAX158BCAI+T operate with a reference voltage other than the internal 2.5 V?
Yes, the MAX158BCAI+T supports external reference configurations. By applying a voltage between VREF− and VREF+, users can set custom full-scale ranges (e.g., 0 V to 4.096 V). The internal 2.5 V reference remains available at REF OUT but is disabled when external reference is applied, preserving accuracy and noise immunity.
What is the purpose of the RDY pin on the MAX158BCAI+T?
The RDY pin on the MAX158BCAI+T is an open-drain ready indicator tied to the microprocessor's WAIT input. It goes low upon CS assertion and returns to high-impedance when conversion completes and data is valid on DB0–DB7. No external pull-up is mandatory, but one is required for proper WAIT-state synchronization in Mode 0 operation.
Is the MAX158BCAI+T pin-compatible with the MAX154 series?
No, the MAX158BCAI+T is not pin-compatible with MAX154 variants. While both share the SSOP-28 package outline, MAX158BCAI+T uses pins 1–4 and 23–28 for AIN1–AIN8 and has A2 as NC, whereas MAX154 maps only four analog inputs across fewer pins and repurposes others (e.g., A2 is functional on MAX154). PCB layout must be specific to MAX158BCAI+T.
MAX158BCAI+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 400k
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Flash
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- Selectable Address
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX158BCAI+T FAQ
1.How can I place an order for MAX158BCAI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX158BCAI+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 MAX158BCAI+T reliable?
The price and inventory of MAX158BCAI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX158BCAI+T is usually 5 days.
3.What payment methods are accepted for MAX158BCAI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX158BCAI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX158BCAI+T?
MAX158BCAI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX158BCAI+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 MAX158BCAI+T?
For technical support, including MAX158BCAI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX158BCAI+T requirements.
6.How does Aetrix verify that MAX158BCAI+T is sourced from the original manufacturer or authorized distributors?
All MAX158BCAI+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 MAX158BCAI+T meets industry standards.
7.What is the process for return or replacement of MAX158BCAI+T?
All MAX158BCAI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX158BCAI+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 MAX158BCAI+T part is unused and in its original packaging.
Return procedure for MAX158BCAI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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