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Analog Devices MAX135CPI+ — DC-DC Power Modules

MAX135CPI+ 15-bit Multi-Slope ADC, 16 S/s, 28-PDIP

MPNMAX135CPI+
End of Life

Maxim Integrated MAX135CPI+, 15-bit Multi-Slope ADC, 1-channel differential input, 16 S/s, parallel data interface, ±5 V analog/digital supplies, 28-pin PDIP (0.600"), 0°C to 70°C, through-hole, tube.

$32.4Ref. price · indicative, final on quote
Analog Devices MAX135CPI+ datasheet (PDF)
Packaging28-DIP (0.600", 15.24mm)
RoHSROHS3 Compliant
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

MAX135CPI+ specifications
ParameterValue
Input typeDifferential
MountingThrough Hole
Reference typeExternal
Voltage - supply, analog±5V
Voltage - supply, digital±5V
I/O channels1
InterfaceParallel
Operating temperature0°C ~ 70°C
PackageTube
ArchitectureMulti-Slope
ConfigurationADC
Number of bits15
Case28-DIP (0.600\", 15.24mm)
Number of a (D converters)1
Sampling rate (Per second)16

Product details

15-bit multi-slope ADC in a 28-pin DIP

The Maxim Integrated MAX135CPI+ is a 15-bit multi-slope integrating ADC in a 28-pin PDIP package. It samples at 16 conversions per second, accepting a single differential input and outputting data over a parallel interface.

Dual ±5 V rails and external reference

Both the analog and digital supply pins need ±5 V — there is no single-rail version of this part. That means a bipolar supply on the board, or a DC-DC converter generating the negative rail.

Through-hole PDIP — rework-friendly, socketable

The 28-pin PDIP (0.600" wide, 15.24 mm pitch) is about as rework-friendly as it gets. No hot air needed — a desoldering station or even a solder sucker will lift this cleanly. If you are prototyping or building a low-volume run, you can socket this in a 28-pin DIP socket and swap parts without touching the board.

Frequently asked questions

Does MAX135CPI+ require an external reference voltage?

Yes, the reference type is external. You must supply a precision reference voltage — the ADC does not include an internal bandgap reference.

What is the closest pin-compatible alternative to MAX135CPI+?

The MAX135CPI+ sits in a small family of multi-slope ADCs from Maxim. A direct pin-compatible sibling is the MAX136CPI+ (3.5-digit version, same footprint and supply). For a 15-bit part, the MAX135 is the primary option in that DIP package; no second-source vendor lists a drop-in equivalent under a different brand.

What is the sampling rate of MAX135CPI+?

The MAX135CPI+ samples at 16 conversions per second. This is a multi-slope integrating ADC — the low rate is by design, giving excellent noise rejection on slow signals.