PWM to DC in One Cycle

PWM to DC in One Cycle
10ppm/°C
Reference
L
PWM to
Binary
12-Bit
DAC
PWM to
Binary
12-Bit
DAC
PWM to
Binary
12-Bit
DAC
PWM to
Binary
PWM Input to DAC Output
LTC2645
12-Bit
DAC
INA
2V/DIV
VOUTA
500mV/DIV
20µs/DIV
No Software. No Ripple. No Latency.
Linear Technology’s PWM to VOUT DACs convert a PWM (pulse-width modulation) input to an accurate, stable, buffered voltage
without the ripple, slow settling and external passive components of discrete filter implementations. The LTC®2645 quad PWM
DAC measures the period and pulse width of the PWM input signal and updates the DAC output immediately with up to 12-bit
accuracy, no software coding required.
Features
nn
nn
nn
nn
nn
nn
nn
nn
30Hz to 100kHz PWM Input
Buffered Rail-to-Rail Voltage Output
Updates and Settles Within 8µs
10ppm/°C Internal Reference; 2.5V Full-Scale
Pin-Selectable Internal or External Reference
±2.5 LSB Maximum INL; ±1LSB Maximum DNL
2.7V to 5.5V Supply
1.71V to 5.5V PWM Inputs
Family of Dual and Quad PWM to VOUT DACs
12-Bit
10-Bit
8-Bit
Dual
12-Pin MSOP
LTC2644-12
LTC2644-10
LTC2644-8
Quad
16-Pin MSOP
LTC2645-12
LTC2645-10
LTC2645-8
L, LT, LTC, LTM, Linear Technology and the Linear logo are
registered trademarks and SoftSpan is a trademark of Linear
Technology Corporation. All other trademarks are the property of
their respective owners.
Voltage Output DACs
8-Bit to 16-Bit Resolution, 1-Channel to 16-Channel VOUT DACs
1-Channel
Parallel
16-Bit
2-Channel
I2C
SPI
PWM
SPI
4-Channel
I2C
PWM
SPI
8-Channel
I2C
SPI
16-Channel
I2C
1821
2641-16
2642-16
2704-16
1657
1650
1655
2654-16
2655-16
2656-16
2657-18
2604
2609
2600
2605
2619
2610
2615
2601
2641-14
2642-14
1658
2611
2641-12
2642-12
2606
2602
2607
SPI
2668-16
2704-14
14-Bit
2616
2612
2617
2644-12
2614
2645-12
2704-12
2668-12
2654-12
2655-12
2656-12
2657-12
12-Bit
1450
2630-12
2640-12
2631-12
2632-12
2633-12
2634-12
2635-12
2636-12
2637-12
1257
2621
2626
2622
2627
2624
2629
2620
2625
2630-10
2640-10
2631-10
2632-10
2633-10
2634-10
2635-10
2636-10
2637-10
10-Bit
2630-8
2640-8
2644-10
1663
1661
1669
1662
2631-8
2644-8
2632-8
2645-10
1664
2633-8
2645-8
2634-8
1660
2635-8
2636-18
2637-8
8-Bit
1665
16-/12-Bit Quad/Octal DACs with
10ppm/°C (Max) Internal Reference
Low Glitch 16-/14-/12-Bit Unbuffered
VOUT Unipolar or Bipolar DACs
12-Bit DAC with Internal Reference
and 5V to 15V Supply Range
Tiny 12-/10-/8-Bit Single/Dual/Quad/Octal
DACs with 10ppm/°C Internal Reference
16-/14/-12-Bit ±10V
VOUT SoftSpan™ DACs
Low Power, Double Buffered
16-/12-Bit Parallel Interface DACs
16-/14-/12-Bit Single/Dual/Quad/Octal
DACs with External Reference
16-/12-Bit ±10V VOUT SoftSpan DACs
with 10ppm/°C (Max) Reference
16-Bit ±10V, Fast 2µs Settling,
Parallel DAC in SSOP-36 Package
16-Bit, ±5V,
Low Glitch DAC
Micropower 10-/8-Bit
Single/Dual/Quad/Octal DACs
14-Bit Low Power DAC
in 8-Pin Packages
16-Bit, Low Power DAC
with Internal Reference
12-/10-/8-Bit PWM
to VOUT DACs
www.linear.com/2645 n 1-800-4-LINEAR
0714