Rainbow-electronics MAX5172 Manual de usuario descargar pdf (Pagina 9)

MAX5170/MAX5172

Low-Power, Serial, 14-Bit DACs

with Voltage Output

_______________________________________________________________________________________ 9

-30

-20

-25

-10

-15

-5

0 1000 1500500 2000 2500 3000

REFERENCE INPUT FREQUENCY RESPONSE

MAX5170/72 toc27

FREQUENCY (kHz)

GAIN (dB)

REF

= 0.67Vp-p + 0.75V

1V/div

OUT

10mV/div

START-UP GLITCH

MAX5170/72 toc28

50ms/div

AC-COUPLED

MAX5172

9 DGND Digital Ground

13 AGND Analog Ground

15 N.C. No Connection

NAME FUNCTION

1 OS Offset Adjustment. Connect to AGND for no offset.

16 V

Positive Supply. Bypass to AGND with a 4.7µF capacitor in parallel with a 0.1µF capacitor.

14 REF Reference Input. Maximum V

REF

is V

- 1.4V.

11 UPO User-Programmable Output. State is set by the serial input.

12 SHDN

Shutdown (digital input). Pulling SHDN high when PDL = V

places the chip in shutdown with a maximum

shutdown current of 10µA.

10 DOUT Serial-Data Output

CLR

Clear DAC (digital input). Clears the DAC to either zero or midscale as determined by RS.

7 DIN Serial-Data Input (digital input). Data is clocked in on the rising edge of SCLK.

8 SCLK Serial Clock Input (digital input)

CS Chip Select Input (digital input). DIN ignored when CS is high.

3 RS

Reset Mode Select (digital input). Connect to V

to select midscale reset output voltage. Connect to

DGND to select 0 reset output voltage.

PDL

Power-Down Lockout (digital input). Connect to V

to allow shutdown. Connect to DGND to disable

software and hardware shutdown.

2 OUT Voltage Output. High impedance when in shutdown. The output voltage is limited to V

Pin Description

Typical Operating Characteristics (continued)

(MAX5170: V

= +5V, V

REF

= 2.5V; MAX5172: V

= +3V, V

REF

= 1.25V; C

= 100pF, OS = GND, code = 3FFF hex,

= +25°C, unless otherwise noted.)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

MAX5170/MAX5172 1

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Rainbow-electronics MAX5172 Manual de usuario Pagina 9

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