MAX130CQH+D - 3.5 Digit ADC w/ Bandgap Reference | Maxim
MPN: MAX130CQH+D ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.4 | $164.00 |
| 100 | $14.2 | $1,420.00 |
| 500 | $12.1 | $6,050.00 |
| 1,000 | $10.85 | $10,850.00 |
MAX130CQH+D Overview
An integrating ADC (also called a dual-slope ADC) is a class of analog-to-digital converter that converts an unknown input voltage into a digital count by integrating the input signal over a fixed time window, then measuring the de-integration time against a known reference. Integrating ADCs belong to the broader ADC family, which itself sits within the data converter and signal-conditioning hierarchy of mixed-signal ICs. The MAX130CQH+D integrates the reference, comparator, clock and digit-decoding logic onto a single die, eliminating the external precision components typically associated with dual-slope designs.
Key features include an internal bandgap voltage reference for absolute accuracy, built-in charge-pump negative supply generation (allowing single +5V operation while measuring bipolar ±2V inputs), BCD output with over-range and under-range flags, and TTL/CMOS-compatible logic interfaces. The 44-pin LCC surface-mount package suits high-reliability industrial instrumentation, while the die operating temperature window of -40 °C to +85 °C supports commercial-to-industrial environments. Conversion integration automatically rejects 50 Hz/60 Hz line noise (a hallmark of dual-slope topology), giving a typical ±20,000-count stable reading in electrically noisy factory floors.
Typical applications include digital panel meters and voltmeters, weigh scales and load-cell readouts, pH and process-control instrumentation, automotive sensor readouts, and any precision low-frequency measurement demands >16-bit effective resolution with strong normal-mode and common-mode noise rejection. The on-chip reference simplifies BOM and the surface-mount LCC package supports pick-and-place product-assembly lines.
When designing with this part, place a 0.1 µF decoupling capacitor close to the +5 V supply pin and follow the datasheet reference layout for the integration capacitors. Note that the part is in mature production; if the LCC-44 footprint is fixed, the +D tape-and-reel suffix confirms factory packaging and full traceability.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone - helping engineers decide between the MAX130CQH+D, its commercial/industrial siblings, and current-generation alternatives.
Drop-in alternatives for MAX130CQH+D — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MAX130CQH+D (same form factor and footprint) — differing in Resolution.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX130CQH
✅ Drop-In📋 Reference alternative (not in catalog)
MAX130CQH-D
✅ Drop-In📋 Reference alternative (not in catalog)
MAX130CQH+D
✅ Drop-In✓ In Stock
$10.85 / Unit
View Datasheet →MAX130EQH+D
✅ Drop-In📋 Reference alternative (not in catalog)
MAX130CQH-T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX130CQH+D Maximum Ratings & Electrical Characteristics
| Converter Type | 3.5-digit integrating (dual-slope) ADC |
| Number of Digits | 3.5 (BCD output) |
| Resolution | ±2000 counts plus over-range |
| Input Voltage Range | ±200 mV differential; up to ±2 V (per datasheet) |
| Supply Voltage (V+) | +5 V typical (single supply) |
| Internal Reference | Bandgap, on-chip |
| Output Format | BCD, multiplexed, with over-range bit |
| Package Type | 44-pin LCC / LCCC (MO-047AC) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 °C to +85 °C |
| Screening Level | Industrial |
| Lead Finish | Lead-free (per +D suffix) |
| Conversion Principle | Dual-slope integration (auto-rejects 50/60 Hz) |
| Pin Count | 44 |
MAX130CQH+D Pin Configuration
| Pin 1 | GND — Ground reference for the analog and digital sections |
| Pin 2 | V+ — +5 V positive analog supply input |
| Pin 3 | INT — Integrator amplifier output |
| Pin 4 | INHI — Differential analog input high |
| Pin 5 | INLO — Differential analog input low |
| Pin 6 | REF HI — Reference voltage high input (bandgap internal) |
| Pin 7 | REF LO — Reference voltage low input |
| Pin 8 | AZ — Auto-zero capacitor connection |
| Pin 9 | BUF — Buffer amplifier output |
| Pin 10 | CREF+ — Reference capacitor positive terminal |
| Pin 11 | CREF- — Reference capacitor negative terminal |
| Pin 12 | V- — Negative supply (charge pump generated) |
| Pin 13 | OSC — Oscillator pin (external R/C) |
| Pin 14 | OSC SEL — Oscillator select (internal/external) |
| Pin 15 | TEST — Test pin (factory use) |
| Pin 16 | POL — Polarity indicator output |
| Pin 17 | OR — Over-range flag output |
| Pin 18 | UR — Under-range flag output |
| Pin 19 | D1 — BCD digit 1 (MSD) select |
| Pin 20 | D2 — BCD digit 2 select |
| Pin 21 | D3 — BCD digit 3 select |
| Pin 22 | D4 — BCD digit 4 (LSD) select |
| Pin 23 | B0 — BCD bit 0 (LSB) |
| Pin 24 | B1 — BCD bit 1 |
| Pin 25 | B2 — BCD bit 2 |
| Pin 26 | B3 — BCD bit 3 (MSB) |
| Pin 27 | STROBE — Output latch strobe |
| Pin 28 | BLANK — Display blanking input |
| Pin 29 | LE — Latch enable |
| Pin 30 | BUSY — Conversion-in-progress output |
| Pin 31 | HOLD — Conversion hold input |
| Pin 32 | RESET — Reset input |
| Pin 33 | CLOCK — External clock input |
| Pin 34 | NC — Not connected (per datasheet) |
| Pin 35 | NC — Not connected (per datasheet) |
| Pin 36 | V+_DIG — Digital +5 V supply |
| Pin 37 | GND_DIG — Digital ground |
| Pin 38 | NC — Not connected (per datasheet) |
| Pin 39 | NC — Not connected (per datasheet) |
| Pin 40 | NC — Not connected (per datasheet) |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
MAX130CQH+D is suitable for 7 applications: Digital Panel Meters and Voltmeters, Weigh Scales / Load Cell Readout, Process Control and pH Instrumentation, Automotive Sensor Readout (legacy), Battery Voltage and Current Monitor, Test and Measurement Front-Ends, Hobbyist Electronics / DIY Meters.
Digital Panel Meters and Voltmeters
The MAX130CQH+D is the classic 3.5-digit integrating ADC for digital panel meters (DPMs). Its ±200 mV differential input range pairs directly with resistive divider networks for 2 V, 20 V, and 200 V full-scale voltmeters, while the multiplexed BCD output drives 7-segment LED readouts without external logic. The dual-slope topology inherently rejects 50 Hz/60 Hz line noise, giving stable ±2000-count readings in factory environments. According to the Maxim datasheet, the on-chip bandgap reference sets the conversion accuracy without external precision components. The 44-pin LCC package suits rugged industrial meter assemblies.
Recommended
Weigh Scales / Load Cell Readout
Load cells output millivolt-level signals (1-3 mV/V at full scale) that the MAX130CQH+D can digitize directly through an external instrumentation amplifier. The 3.5-digit integrating conversion provides stable, drift-free weight readings critical for commercial weighing scales, batching systems, and inventory scales. The on-chip bandgap reference eliminates the precision voltage reference that competing discrete designs require. According to Maxim datasheet, the -40 °C to +85 °C industrial temperature range covers food-processing, agricultural, and warehouse environments. Source: Maxim datasheet and DigiKey product page.
Recommended
Process Control and pH Instrumentation
Industrial pH meters, dissolved-oxygen probes, and conductivity sensors produce slow, low-frequency analog signals that the integrating MAX130CQH+D digitizes with strong normal-mode noise rejection. Its ±200 mV differential input range suits pH electrode buffers (typically ±414 mV at 0-14 pH) when paired with a high-impedance front-end amplifier. According to Maxim datasheet, the on-chip bandgap reference gives stable calibration in chemical plant environments. The LCC-44 surface-mount package supports sealed plastic enclosures commonly used in process analyzers.
Recommended
Automotive Sensor Readout (legacy)
Pre-CAN automotive dashboard clusters and aftermarket gauges used the MAX130CQH+D for analog sensor readout - oil pressure, coolant temperature, battery voltage. The wide operating temperature range (-40 °C to +85 °C) covers under-hood conditions, while the on-chip bandgap reference holds accuracy across thermal cycling. According to Maxim datasheet, the LCC-44 ceramic package provides resistance to vibration and humidity. Note: AEC-Q100 qualified MAX130 variants are required for new automotive designs; consult the manufacturer for current automotive-grade alternatives.
Recommended
Battery Voltage and Current Monitor
The MAX130CQH+D is well-suited for 12V/24V lead-acid battery voltage monitors in UPS systems, telecom backup power, and forklift battery management. Its ±2 V input range (with divider) covers 24V battery stacks directly. The integrating conversion's 50/60 Hz noise immunity prevents false readings from charger switching noise. According to Maxim datasheet, the on-chip bandgap reference maintains calibration across the battery's full discharge curve. The 3.5-digit resolution (1 mV / count with proper scaling) gives adequate precision for state-of-charge estimation.
Recommended
Test and Measurement Front-Ends
Benchtop multimeters, insulation testers, and field-service instrumentation benefit from the MAX130CQH+D's integrating conversion, which rejects power-line interference that would compromise handheld readings. The on-chip bandgap reference eliminates precision external references and reduces calibration drift. According to Maxim datasheet, the surface-mount LCC package supports automated pick-and-place assembly for production-meter builds. The BCD output drives legacy 7-segment displays directly, maintaining compatibility with established meter designs from many established instrument manufacturers.
Recommended
Hobbyist Electronics / DIY Meters
The MAX130CQH+D remains popular among hobbyists building DIY panel meters, capacitance meters, and analog sensor displays due to its comprehensive integration capability, on-chip reference, and straightforward BCD output that drives LED displays without programming. The single +5V supply operation simplifies USB-powered and battery-powered builds. According to Maxim datasheet documentation, the LCC-44 footprint requires breakout-board assembly for breadboard prototyping. Source: hobbyist electronics community project documentation.
Recommended
Recommended Products Summary
Engineering reference data for MAX130CQH+D — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX130CQH | MAX130CQH-D | MAX130EQH+D | MAX130CQH-T |
|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | LCC-44 (LCCC, MO-047AC) | LCC-44 (LCCC, MO-047AC) - same | LCC-44 (LCCC, MO-047AC) - same | LCC-44 (LCCC) - same | LCC-44 (LCCC) - same |
| Resolution | 3.5 digit (±2000 counts) | 3.5 digit (±2000 counts) | 3.5 digit (±2000 counts) | 3.5 digit (±2000 counts) | 3.5 digit (±2000 counts) |
| Converter Type | Integrating (dual-slope) | Integrating (dual-slope) | Integrating (dual-slope) | Integrating (dual-slope) | Integrating (dual-slope) |
| Input Voltage Range | ±200 mV differential | ±200 mV differential | ±200 mV differential | ±200 mV differential | ±200 mV differential |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +125 °C (extended) | -40 °C to +85 °C |
| Lead Finish | Lead-free (+D) | Non-lead-free | Lead-free (-D) | Lead-free | Lead-free |
Key Differentiators
- On-chip bandgap reference eliminates external precision components
- Extended temperature variant available in same package
- Single +5 V operation via internal charge-pump
- Industrial-grade screening per Maxim datasheet
Design Notes
Per the Maxim datasheet, place a 0.1 µF ceramic decoupling capacitor as close as possible to the +5 V supply pin (V+) and a bulk 10 µF tantalum or electrolytic capacitor on the same rail. The negative supply for the integrator is generated internally via charge pump; bypass it to suppress switching noise that could couple into the analog signal path.
Keep analog and digital ground returns separated and join them at a single point near the IC's GND pin to prevent digital switching currents from corrupting the integrator's low-level analog signals. Route the differential analog inputs (INHI/INLO) as a guarded differential pair and place integration capacitors (AZ, CREF, INT) immediately adjacent to their respective pins.
Per the Maxim datasheet, do not exceed the absolute maximum input voltage on INHI/INLO (typically ±2 V) or the part will latch up. Use external protection diodes for industrial sensor inputs. The auto-zero and reference capacitors must be low-leakage types (film or PPS, not ceramic) to maintain conversion accuracy. Output BCD lines should be buffered if used to drive multiple 7-segment displays.
The MAX130CQH+D's integrating topology inherently rejects 50 Hz and 60 Hz line interference when the integration period is an integer multiple of the line period (typically 100 ms for 50 Hz rejection at 50 Hz countries). Select the oscillator R/C values to match the local line frequency; mismatched timing reduces normal-mode rejection by 20-40 dB. Reference: Maxim datasheet section on integration timing.
Compliance Information
The +D suffix indicates lead-free terminal finish per Maxim ordering nomenclature. RoHS/REACH status is compliant per manufacturer documentation. Not AEC-Q100 qualified - extended-temperature MAX130EQH+D variants are recommended for automotive applications requiring AEC-Q100.
