My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1245BCAP+
- Part No.:
- MAX1245BCAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1245BCAP+.pdf
- Description:
- IC ADC 12BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,962
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX1245BCAP+ from Maxim Integrated is a 12-bit, 8-channel serial analog-to-digital converter (ADC) with integrated track/hold, SPI/QSPI/MICROWIRE-compatible 4-wire interface, and software-configurable unipolar/bipolar, single-ended/differential inputs. It operates from a single +2.375V to +3.3V supply, delivers 100ksps conversion rate, and achieves ±1 LSB INL and 12-bit no-missing-codes performance over 0°C to +70°C. It is used in portable data loggers for high-accuracy, low-power sensor digitization.
For engineers reviewing the MAX1245BCAP+ datasheet, MAX1245BCAP+ pinout, MAX1245BCAP+ application, or MAX1245BCAP+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated SSOP-20 pin functions, confirmed alternatives with documented differences, and supply support for battery-powered instrumentation designs.
Technical Context
The MAX1245BCAP+ uses successive-approximation architecture with an internal 12-bit capacitive DAC and on-chip track/hold circuitry. Its analog input multiplexer supports eight single-ended or four pseudo-differential channel pairs (CH0/CH1 through CH6/CH7), with COM pin serving as common-mode reference.
It features dual clock modes: external serial clock (up to 1.5MHz) for synchronous timing control, or internal clock (1.5MHz when SHDN open, 225kHz when SHDN high) enabling autonomous conversion and flexible host readout. The 4-wire serial interface includes CS, SCLK, DIN, and DOUT, with optional SSTRB strobe for TMS320-family DSP synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees 4096 discrete output codes with no missing codes across temperature. |
| INL (Integral Nonlinearity) | ±1 LSB - ensures end-point calibrated accuracy within ±0.024% of full scale for precision measurement systems. |
| Sampling Rate | 100ksps - supports real-time acquisition of signals up to 50kHz Nyquist bandwidth in continuous mode. |
| Supply Voltage Range | +2.375V to +3.3V - enables direct operation from single Li-ion or regulated 2.5V/3.3V rails without level-shifting. |
| Power Consumption | 0.8mA at 100ksps; 10µA at 1ksps - allows duty-cycled operation in battery-powered instruments to extend runtime. |
| Analog Input Configuration | Software-selectable unipolar (0V to VREF) or bipolar (–VREF/2 to +VREF/2), single-ended or differential - eliminates external signal conditioning for diverse sensor types. |
| Reference Interface | External VREF input (0V to VDD) - supports user-defined full-scale range (e.g., 2.048V) for optimal ADC utilization and noise floor control. |
Pinout & Package
MAX1245BCAP+ is housed in a 20-pin SSOP package (5.3mm × 7.2mm, 0.65mm pitch), occupying 30% less board area than equivalent 20-pin DIP. This surface-mount package supports automated assembly and improved thermal performance in compact portable systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8 (CH0–CH7) | Analog input channels | Eight single-ended or four differential input pairs; selected via 3-bit SEL field in control byte; require stable COM reference in single-ended mode. |
| 9 (COM) | Analog common-mode reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB (≈1mV) during conversion to avoid gain/offset errors. |
| 10 (SHDN) | Three-level hardware shutdown | Pull low → 10µA shutdown; leave open → 1.5MHz internal clock; pull high → 225kHz internal clock - enables dynamic power scaling without software overhead. |
| 11 (VREF) | External reference voltage input | Accepts 0V to VDD; sets full-scale range; internal 18kΩ input resistance allows direct connection to precision references like REF2025. |
| 12, 20 (VDD) | Positive supply | Single +2.375V to +3.3V supply powers analog and digital sections; decoupling required per pin per datasheet layout guidelines. |
| 13 (AGND) | Analog ground | Separate AGND plane required; must be tied to DGND at single point near VDD pins to minimize noise coupling into sensitive analog front-end. |
| 14 (DGND) | Digital ground | Return path for serial interface and logic; isolation from AGND prevents digital switching noise from degrading SNR. |
| 15 (DOUT) | Serial data output | 3-state output clocked on SCLK falling edge; MSB-first format; high-impedance when CS = high - enables bus sharing with other SPI peripherals. |
| 16 (SSTRB) | Serial strobe output | Indicates conversion start/end: low during conversion in internal clock mode; one-cycle pulse before MSB in external clock mode - synchronizes DSP capture without polling. |
| 17 (DIN) | Serial data input | Accepts 8-bit control byte on SCLK rising edge; first '1' bit defines MSB; supports MICROWIRE/SPI/QSPI framing with CPOL=0, CPHA=0. |
| 18 (CS) | Active-low chip select | Enables serial interface; DOUT enters high-Z state when CS = high; CS toggle aborts ongoing conversion and resets internal logic. |
| 19 (SCLK) | Serial clock input | Drives data transfer and (in external mode) conversion timing; 40%–60% duty cycle required; max 1.5MHz for full-spec operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low power shutdown | 1µA typical quiescent current in power-down mode - extends battery life in intermittent-sampling applications like environmental monitors. |
| Flexible analog input configuration | Runtime-selectable unipolar/bipolar and single-ended/differential modes via control byte - eliminates need for external op-amp reconfiguration circuitry. |
| Integrated track/hold | No external hold capacitor required; 2.0µs acquisition time (min); supports source impedances ≤1kΩ without AC performance degradation. |
| SPI/QSPI/MICROWIRE compatibility | Native 4-wire interface with no glue logic; supports CPOL=0/CPHA=0; SSTRB output enables direct TMS320-family DSP integration. |
| Hardware + software power control | SHDN pin enables instant wake/sleep; software-selectable power-down at conversion end - allows fine-grained energy management in firmware. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 10Hz intervals. IC Role / Device Role / Timing Role: 12-bit ADC digitizing multiple analog sensors via multiplexed inputs; internal track/hold captures stable readings despite variable source impedance. Use Value: 10µA shutdown current between samples extends 2000mAh Li-ion battery life to >1 year; SSOP-20 footprint minimizes PCB area in compact enclosure. |
Use Scenario: Handheld ECG monitor acquiring lead-II differential signals with baseline drift compensation. IC Role / Device Role / Timing Role: Pseudo-differential ADC converting CH1–CH2 pair; COM referenced to mid-supply for bipolar input range; software-configurable gain matching. Use Value: ±1 LSB INL ensures diagnostic-grade amplitude accuracy; 100ksps sampling supports 50Hz notch filtering and HRV analysis without aliasing. |
| Battery-Powered Test Equipment | Industrial Sensor Interface |
|
Use Scenario: Pocket-sized multimeter measuring DC voltage, current, and resistance using shared analog front-end. IC Role / Device Role / Timing Role: Reconfigurable ADC supporting unipolar 0–2.048V (voltage), ratiometric (current shunt), and bridge (strain gauge) modes via same control interface. Use Value: Single-supply +2.375V operation eliminates negative rail; external VREF allows precise 2.048V full-scale for 0.1% reading accuracy across ranges. |
Use Scenario: Smart transmitter module converting 4–20mA loop-powered sensor outputs to digital for HART communication. IC Role / Device Role / Timing Role: Low-power ADC interfacing isolated analog inputs; SHDN pin synchronized to microcontroller sleep cycles to meet <100µA average loop current. Use Value: 0.8mA active current at 100ksps enables fast diagnostics while maintaining loop compliance; SSOP package withstands industrial reflow profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1245ACAP+ | ±0.5 LSB INL (vs. ±1 LSB), same package/temp range - tighter relative accuracy at cost of higher price. | Better suited for calibration-critical lab equipment where end-point linearity dominates system error budget. | Select MAX1245ACAP+ only if ±0.5 LSB INL is required; MAX1245BCAP+ offers optimal cost/performance balance for portable instrumentation. |
| MAX147ACPP+ | Pin-compatible but requires +2.7V to +5.25V supply; no SHDN pin; 10-bit resolution - wider VDD range, lower resolution, no hardware shutdown. | Applicable where higher supply voltage is available and 10-bit resolution suffices (e.g., basic industrial monitoring). | Choose MAX147ACPP+ only if system uses ≥2.7V supply and 10-bit resolution is acceptable; not a drop-in replacement due to voltage and feature mismatch. |
Compared with MAX1245ACAP+, MAX1245BCAP+ trades 0.5 LSB INL for lower cost and identical power/performance in most field-deployed instruments; compared with MAX147ACPP+, it adds SHDN control, 12-bit resolution, and true 2.375V operation - making it superior for ultra-low-voltage, battery-constrained designs.
Availability
MAX1245BCAP+ is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and guaranteed SSOP-20 packaging.
Supply support for MAX1245BCAP+ 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 industrial, medical, and portable applications.
The MAX1245 series was designed specifically for low-power, multi-channel data acquisition in space- and energy-constrained systems - emphasizing single-supply operation, integrated track/hold, and SPI-compatible serial interface without external components.
FAQ
What is the operating temperature range for MAX1245BCAP+?
The MAX1245BCAP+ is specified for 0°C to +70°C ambient operation. This commercial-grade temperature range aligns with its target use in portable consumer and industrial instrumentation where extended thermal extremes are not required. The 'B' grade denotes ±1 LSB INL performance across this full range, validated per Maxim's production test flow.
Does MAX1245BCAP+ require an external reference voltage?
Yes, MAX1245BCAP+ requires an external reference voltage applied to the VREF pin. It accepts 0V to VDD (up to +3.3V), and typical operation uses +2.048V for optimal 12-bit code spacing. The device does not include an internal reference; VREF directly sets full-scale range and impacts gain error and noise floor.
Can MAX1245BCAP+ operate from a +2.5V supply?
Yes, MAX1245BCAP+ fully supports +2.5V operation within its specified +2.375V to +3.3V range. At +2.5V, it maintains 12-bit no-missing-codes performance, ±1 LSB INL, and 0.8mA supply current at 100ksps - making it ideal for systems powered by regulated 2.5V rails or single-cell Li-ion batteries under load.
How does the SHDN pin function on MAX1245BCAP+?
The SHDN pin on MAX1245BCAP+ provides three-level hardware control: pulled low → 10µA shutdown; left open → 1.5MHz internal clock; pulled high → 225kHz internal clock. This enables rapid power-state transitions without software intervention, critical for burst-mode sensing in battery-powered devices.
Is MAX1245BCAP+ compatible with standard SPI interfaces?
Yes, MAX1245BCAP+ is compatible with standard SPI interfaces when configured with CPOL = 0 and CPHA = 0. Its 4-wire serial interface (CS, SCLK, DIN, DOUT) supports SPI, QSPI, and MICROWIRE protocols without external logic, and DOUT is three-state to allow bus sharing with other SPI peripherals.
MAX1245BCAP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 4, 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.375V ~ 3.3V
- Voltage - Supply, Digital:
- 2.375V ~ 3.3V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1245BCAP+ FAQ
1.How can I place an order for MAX1245BCAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1245BCAP+ 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 MAX1245BCAP+ reliable?
The price and inventory of MAX1245BCAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1245BCAP+ is usually 5 days.
3.What payment methods are accepted for MAX1245BCAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1245BCAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1245BCAP+?
MAX1245BCAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1245BCAP+ 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 MAX1245BCAP+?
For technical support, including MAX1245BCAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1245BCAP+ requirements.
6.How does Aetrix verify that MAX1245BCAP+ is sourced from the original manufacturer or authorized distributors?
All MAX1245BCAP+ 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 MAX1245BCAP+ meets industry standards.
7.What is the process for return or replacement of MAX1245BCAP+?
All MAX1245BCAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1245BCAP+, 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 MAX1245BCAP+ part is unused and in its original packaging.
Return procedure for MAX1245BCAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1245BCAP+ Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
