DS4303 Maxim Integrated Products, Inc., DS4303 Datasheet - Page 6

• Manufacturer Part Number: DS4303
• Description: Electronically Programmable Voltage Reference
• Manufacturer: Maxim Integrated Products, Inc.

Electronically Programmable
Voltage Reference
Figure 1. Timing Diagram
6
PIN
1
2
3
4
5
_____________________________________________________________________
GND
ADJ
V
V
CC
IN
NAME
V
V
GND
CC
ADJ
V
V
V
OUT
R
ADJ
V
CC
PU
OUT
IN
IN
V
CC
R
PD
t
Adjust Control Input
Ground
Sample Voltage Input
Voltage Output
Power-Supply Voltage
ADJ
CONTROL
EEPROM
ADC
AND
FIRST PROGRAMMING CYCLE
∆V
Pin Description
Block Diagram
OUT
DS4303
FUNCTION
12-BIT
V
DAC
REF
x t
ST
∆V
OUT
V
t
W
OUT
t
∆V
ADJ
OUT
The DS4303 provides a precise, NV output voltage,
V
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
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
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
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
self-adjust period begins. The length of the V
adjust period can be determined using the formula
∆V x t
ADDITIONAL PROGRAMMING CYCLES (IF REQUIRED)
OUT
∆V
, making it an ideal solution for factory calibration
ST
OUT
, where ∆V is | V
IN
x t
ST
, toggling ADJ, waiting as V
t
W
Detailed Description
OUT OLD
t
ADJ
- V
OUT NEW
OUT
ADJ
self-adjusts,
, the V
|.
OUT
IN
. This
ADJ
self-
OUT
,