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Analog Devices LTC2644HMS-L12#PBF — Logic ICs

LTC2644HMS-L12#PBF Dual 12-Bit PWM DAC, 7.8µs

MPNLTC2644HMS-L12#PBF
End of Life

Analog Devices LTC2644HMS-L12#PBF, dual 12-bit voltage-output DAC, PWM data interface, 7.8µs typ settling, ±1 LSB INL/DNL, 2.7V to 5.5V supply, -40°C to 125°C, 12-MSOP package, Tube.

$8.94Ref. price · indicative, final on quote
Packaging12-TSSOP (0.118", 3.00mm Width)
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
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Specifications

LTC2644HMS-L12#PBF Technical Specifications
ParameterValue
Output typeVoltage - Buffered
Mounting typeSurface Mount
Reference typeExternal, Internal
Voltage - supply, analog2.7V ~ 5.5V
Voltage - supply, digital2.7V ~ 5.5V
InterfacePWM
Operating temperature-40°C ~ 125°C
PackageTube
INL (DNL)±1, ±1 (Max)
Settling time7.8µs (Typ)
Number of bits12
Case12-TSSOP (0.118\", 3.00mm Width)
Differential outputNo
Number of d (A converters)2

Product details

Dual 12-bit PWM DAC with extended temperature range

It integrates two DAC channels in a 12-MSOP package, each with its own PWM demodulator and output buffer, so a single PWM signal per channel generates a clean analog voltage without an external filter.

The data interface is PWM, not SPI or I2C. That is the defining difference versus most precision DACs: you feed a variable-duty-cycle digital signal on each channel's PWM input, and the internal demodulator converts it to a DC voltage. The settling time to 0.5 LSB is 7.8 µs typ, which sets the minimum PWM period you can use. If your PWM carrier runs at, say, 1 kHz (1 ms period), the DAC settles well within one cycle. At higher PWM frequencies — 100 kHz gives a 10 µs period — the 7.8 µs settling consumes most of the period, so the output may not fully settle before the next update. For closed-loop applications, budget the settling time against your PWM update rate.

Accuracy budget: ±1 LSB INL and DNL

Integral and differential nonlinearity are both specified at ±1 LSB maximum at 12 bits. That means every code is guaranteed monotonic, and the worst-case deviation from an ideal transfer function is one LSB — about 0.024% of full scale at 5 V reference. No calibration is needed for most 12-bit systems; if your error budget allocates ±0.1% for the DAC, this part fits without trimming. The reference can be external or internal, so you can match the full-scale range to the ADC reference or sensor output span.

Package and supply: 12-MSOP footprint, single-supply operation

Housed in a 12-MSOP (3.00 mm × 3.00 mm body, 0.65 mm pitch), this DAC fits on dense mixed-signal boards where every mm² counts. The output is rail-to-rail buffered, swinging from near ground to within a few millivolts of the positive rail. Surface-mount assembly is standard; no exposed pad to route.

Lifecycle and sourcing

For volume commitments or scheduled deliveries, a procurement inquiry will establish lead time and price breaks.

Frequently asked questions

Does LTC2644HMS-L12#PBF have a SPI or PWM interface?

The data interface is PWM, not SPI. Each of the two DAC channels accepts a separate PWM input, and the internal demodulator converts the duty cycle to a buffered analog voltage.

What is the output type of the LTC2644?

The output is Voltage - Buffered, meaning each DAC channel has an internal rail-to-rail output buffer that can drive loads directly without an external op-amp.

What are the equivalent replacement parts for LTC2644HMS-L12#PBF?

The AD5689RBRUZ and AD5689RARUZ are 16-bit dual DACs from the same nanoDAC+ family with SPI interface, but they are not pin-compatible (different package and interface). The AD7249ARZ is a 12-bit dual DAC with SPI interface in a wider SOIC package. None of these are drop-in replacements — the LTC2644's PWM input is unique. For a functional equivalent with the same PWM interface, stay within the LTC2644 family.