Rainbow Electronics MAX5106 - Manual (Page 8)

Detailed Description
The MAX5105/MAX5106 quad, 8-bit DACs feature an
internal, nonvolatile EEPROM, which stores the DAC
states for initialization during power-up. These devices
consist of four resistor string DACs, four rail-to-rail
buffers, a 14-bit shift register, oscillator, power-on reset
(POR) circuitry, and five volatile and five nonvolatile
memory registers (Functional Diagram). The shift regis-
ter decodes the control and address bits, routing the
data to the proper memory registers. Data can be writ-
ten to a selected volatile register, immediately updating
the DAC output, or can be written to a selected non-
volatile register for storage.
The five volatile registers retain data as long as the
device is enabled and powered. Once power is
removed or the device is shut down, the volatile regis-
ters are cleared. The nonvolatile registers retain data
even after power is removed. On power-up, the POR
circuitry and internal oscillator control the transfer of
data from the nonvolatile registers to the volatile regis-
ters, which automatically initializes the device upon
startup. Data can be read from the nonvolatile registers
through DOUT.
MAX5105/MAX5106
Nonvolatile, Quad, 8-Bit DACs
8 _______________________________________________________________________________________
Pin Description
PIN
MAX5105 MAX5106
NAME FUNCTION
1 1 REFH1 DAC1 High Reference Input
2 2 REFH0 DAC0 High Reference Input
3 3 V
DD
Positive Supply Voltage
4 — RDY/BSY
Ready/Busy Open-Drain Output. Indicates the state of the nonvolatile memory.
Connect a 100k
Ω pullup resistor from RDY/BSY to V
DD.
5 4 CLK Serial Clock Input
6 5 CS Chip Select Input
7 6 DIN Serial Data Input
8 7 DOUT Serial Data Output
9 — MUTE Mute Input. Drives all DAC outputs to their respective REFL_ voltages.
10 8 GND Ground. Serves as REFL2 and REFL3 for the MAX5106.
11 9 REFL0 DAC0 Low Reference Input
12 10 REFL1 DAC1 Low Reference Input
13 — REFL2 DAC2 Low Reference Input
14 — REFL3 DAC3 Low Reference Input
15 11 OUT3 DAC3 Output
16 12 OUT2 DAC2 Output
17 13 OUT1 DAC1 Output
18 14 OUT0 DAC0 Output
19 15 REFH3 DAC3 High Reference Input
20 16 REFH2 DAC2 High Reference Input