MAX5139GTE+ Datasheet MAX5138BGTE+T, MAX5139GTE+, MAX5138BGTE+ | P7-P9

Low-Power, Single, 16-/12-Bit,

Buffered Voltage-Output DACs

Maxim Integrated 7

MAX5138/MAX5139

SETTLING TIME DOWN

MAX5138 toc19

400ns/div

500mV/div

DIGITAL FEEDTHROUGH

MAX5138 toc20

40ns/div

OUT

SCLK

5V/div

50mV/div

DIGITAL SUPPLY CURRENT

vs. DIGITAL SUPPLY VOLTAGE

MAX5138 toc21

DIGITAL SUPPLY VOLTAGE (V)

DIGITAL SUPPLY CURRENT (μA)

4.74.23.73.2

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0.50

2.7 5.2

AVDD

= 5.25V

SCLK

= 1MHz

REFERENCE VOLTAGE

vs. SUPPLY VOLTAGE

MAX5138 toc22

SUPPLY VOLTAGE (V)

REFO

(V)

4.74.23.73.2

2.4350

2.4355

2.4360

2.4365

2.4370

2.4375

2.4380

2.4385

2.4390

2.4345

2.7 5.2

= +25°C

= +105°C

= -40°C

REFERENCE VOLTAGE

vs. TEMPERATURE

MAX5138 toc23

TEMPERATURE (°C)

REFO

(V)

8060-20 0 20 40

2.4350

2.4355

2.4360

2.4365

2.4370

2.4375

2.4380

2.4385

2.4345

-40 100

DIGITAL SUPPLY CURRENT

vs. DIGITAL INPUT VOLTAGE

MAX5138 toc24

DIGITAL INPUT VOLTAGE (V)

DIGITAL SUPPLY CURRENT (μA)

4123 5

500

1000

1500

2000

2500

AVDD

= V

DVDD

= 5.25V

DOWN

FULL-SCALE OUTPUT

vs. TEMPERATURE

MAX5138 toc25

TEMPERATURE (°C)

OUTPUT VOLTAGE (V)

8060-20 0 20 40

2.44

2.45

2.46

2.47

2.48

2.49

2.50

2.51

2.43

-40 100

EXTERNAL REF = 2.5V

INTERNAL REF

OUTPUT VOLTAGE

vs. SUPPLY CURRENT

MAX5138 toc26

OUTPUT CURRENT (mA)

OUTPUT VOLTAGE (V)

2010

2.41

2.42

2.43

2.44

2.45

2.40

030

AVDD

= 5V

AVDD

= 3.3V

Typical Operating Characteristics (continued)

= +25°C, unless otherwise noted.)

FULL-SCALE REFERENCE FEEDTHROUGH

MAX5138 toc27

20μs/div

OUT

REF

500mV/div

0 V

OUT

0 V

REF

500mV/div

ZERO-SCALE REFERENCE FEEDTHROUGH

MAX5138 toc28

20μs/div

OUT

REF

20mV/div

500mV/div

REFERENCE INPUT RESPONSE

vs. FREQUENCY

MAX5138 toc29

INPUT FREQUENCY (kHz)

ATTENUATION (dB)

100010010

-30

-25

-20

-15

-10

-5

-35

1 10,000

POWER-UP GLITCH, ZERO-SCALE,

EXTERNAL REFERENCE

MAX5138 toc30

4μs/div

1V/div

2V/div

OUT

AVDD

POWER-UP GLITCH, ZERO-SCALE,

INTERNAL REFERENCE

MAX5138 toc31

4μs/div

1V/div

2V/div

OUT

AVDD

POWER-UP GLITCH, MIDSCALE,

EXTERNAL REFERENCE

MAX5138 toc32

4μs/div

1V/div

2V/div

OUT

AVDD

POWER-UP GLITCH, MIDSCALE,

INTERNAL REFERENCE

MAX5138 toc33

4μs/div

1V/div

2V/div

OUT

AVDD

DC NOISE SPECTRUM, FFT PLOT

BUFFERED OUTPUT

MAX5138 toc34

2.5kHz/div

25kHz/div

-40dBm

10dB/div

RESOLUTION BANDWIDTH = 1Hz

50Ω LOAD

Low-Power, Single, 16-/12-Bit,

Buffered Voltage-Output DACs

8 Maxim Integrated

MAX5138/MAX5139

Typical Operating Characteristics (continued)

= +25°C, unless otherwise noted.)

Detailed Description

The MAX5138/MAX5139 are a family of single-channel,

pin-compatible and software-compatible, 16-bit and 12-

bit DACs. The parts are low-power, buffered voltage-

output, high-linearity DACs. The MAX5138/MAX5139

minimize the digital noise feedthrough from input to out-

put by powering down the SCLK and DIN input buffers

after completion of each 24-bit serial input. On power-

up, the MAX5138/MAX5139 reset the DAC output to zero

or midscale, depending on the state of the M/Z input,

providing additional safety for applications that drive

valves or other transducers that need to be off on power-

up. The MAX5138/MAX5139 contain a segmented resis-

tor string-type DAC, a serial-in parallel-out shift register,

a DAC register, power-on reset (POR) circuit, and con-

trol logic. On the falling edge of the clock (SCLK) pulse,

the serial input (DIN) data is shifted into the device, MSB

first. During power-down, an internal 80kΩ resistor pulls

DAC outputs to AGND.

Output Amplifier (OUT)

The MAX5138/MAX5139 include an internal buffer for the

DAC output. The internal buffer provides improved load

regulation and transition glitch suppression for the DAC

output. The output buffer slews at 1.25V/µs and drives up

to 2kΩ in parallel with 200pF. The analog supply voltage

(AVDD) determines the maximum output voltage range

of the device as AVDD powers the output buffer.

DAC Reference

Internal Reference

The MAX5138/MAX5139 feature an internal reference

with a nominal +2.44V output. Connect REFO to REFI

when using the internal reference. Bypass REFO to

AGND with a 47pF (maximum 100pF) capacitor.

Alternatively, if heavier decoupling is required, add a

1kΩ resistor in series with a 1µF capacitor in parallel

with the existing 100pF capacitor. REFO can deliver up

to 100µA of current with no degradation in perfor-

mance. Configure other reference voltages by applying

a resistive potential divider with a total resistance

greater than 33kΩ from REFO to AGND.

External Reference

The external reference input features a typical input

impedance of 113kΩ and accepts an input voltage

from +2V to AVDD. Connect an external voltage

supply between REFI and AGND to apply an ex-

ternal reference. Leave REFO unconnected. Visit

www.maximintegrated.com/products/references for

a list of available external voltage-reference devices.

Low-Power, Single, 16-/12-Bit,

Buffered Voltage-Output DACs

Maxim Integrated 9

MAX5138/MAX5139

Pin Description

PIN NAME FUNCTION

1, 4, 9 N.C. No Connection. Not internally connected.

2 M/Z

Power-Up Reset Select. Connect M/Z low to AGND to power up the DAC output. Connect M/Z

high to power up the DAC output to midscale.

3 LDAC Load DAC. Active-low hardware load DAC input.

5 SCLK Serial-Clock Input

6 CS Active-Low Chip-Select Input

7 DIN Data In

8 AGND Analog Ground. Internally connected to AGND. Connect AGND to AGND externally.

10 READY Data Output

11 DVDD Digital Power Supply. Bypass DVDD with a 0.1μF capacitor to AGND.

12 OUT Buffered DAC Output

13 AVDD Analog Power Supply. Bypass AVDD with a 0.1μF capacitor to AGND.

14 REFI Reference Voltage Input. Bypass REFI with a 0.1μF capacitor to AGND.

15 REFO Reference Voltage Output

16 AGND DAC Ground. Internally connected to AGND. Connect AGND to AGND externally.

— EP

Exposed Pad. Not internally connected. Connect EP to AGND or leave unconnected. Not

intended as an electrical connection point.

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P17

MAX5139GTE+

Mfr. #:

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Digital to Analog Converters - DAC 12-Bit Precision DAC

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MAX5139GTE+

MAX5139GTE+

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