Rainbow-electronics DS4303 Manual do Utilizador descarregar pdf (Página 6)

DS4303

Voltage Sample and Infinite Hold

6 _____________________________________________________________________

Detailed Description

The DS4303 provides a precise, NV output voltage,

OUT

, making it an ideal solution for factory calibration

of embedded systems. The DS4303 output voltage can

be adjusted over almost the entire operating supply

range of the device, and it can be precisely set to with-

in ±1mV. A graphical description of the DS4303 is pro-

vided in the block diagram.

During factory calibration, a simple adjustment proce-

dure must be followed. This entire procedure includes

setting V

, toggling ADJ, waiting as V

OUT

self-adjusts,

and waiting for the completion of the EEPROM storage

cycle (See the timing diagram in Figure 1). At the start

of calibration, a voltage must be placed on V

. This

voltage needs to be completely stable before the

adjustment procedure begins, and it must remain sta-

ble throughout the entire adjustment procedure. The

DS4303 will start its self-adjust procedure when the

ADJ pin is pulled low and held low for at least t

ADJ

after which it can be released at any time. Once ADJ

has been released, it should not be toggled again for

the remainder of the adjustment procedure. After the

falling edge on ADJ and the wait time, t

ADJ

, the V

OUT

self-adjust period begins. The length of the V

OUT

self-

adjust period can be determined using the formula

∆V x t

, where ∆V is | V

OUT OLD

- V

OUT NEW

ADJ

GND

OUT

REF

ADC

AND

CONTROL

EEPROM

12-BIT

DAC

DS4303

Figure 1. Timing Diagram

NAME

FUNCTION

1 ADJ Adjust Control Input

2 GND Ground

Sample Voltage Input

OUT

Voltage Output

Power-Supply Voltage

Pin Description

Block Diagram

OUT

ADJ

FIRST PROGRAMMING CYCLE ADDITIONAL PROGRAMMING CYCLES (IF REQUIRED)

ADJ

∆V

OUT

x t

∆V

OUT

x t

∆V

OUT

∆V

OUT

1 2 3 4 5 6 7 8

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